Hi Jack, glad to contact you here. This is Sophia from China, we do the same field abt injection molding, may I know your email? My email is sophia@weichuangmfg.com
Great introduction. That is just what we do. We produce plastic injection molds and then do mass production using the molds. Very small quantity like thousands or hundreds is accepted. www.rpimoulding.com sales01@rpimoulding.com This is Vicky from Xiamen, China.
I’m a maintenance mechanic at a plastic injection molding plant. I rebuild and maintain these machines. If someone asked to explain the principles involved I don’t think I would have done it as well. Our molds don’t have hot runners, or date stamps so I actually picked up some knowledge. Good video sir.
I designed injection molded parts for over 38 years. This video is on of the most thorough presentations of the molding process. This video with help new designers and engineers explain why it will take weeks to complete a mold due to strength of the pressures and the precision, and complexity of cooling the mold. Hats off!
After spending over 25 years as an injection mould toolmaker I thought I knew just about all there was to know. This is an excellent educational video that I have benefitted from watching and learnt much more than I expected. Many thanks for posting this.
As an industrial designer, I wish they would have taught this information in college as thoroughly as this video did in less than 10 minutes… would have saved me the trouble of piecing it together on my own bit by bit over a couple of years.
I'd just like to add that the water pumped round the tool isn't always cold. Where I work we regularly use water anywhere between 20*C and 80*C depending on the mould size and the material used for that job. We've even had moulds go up to 130*C for glass filled lens housings.
Absolutely agree with the Lego part. Our teachers often tell us how incrediblely complex and well-constructed the Lego parts are and what huge amount of engineering know-how went into making them. This year we even got the challenge to construct a mold for a Duplo part (A little bit easier but still great to build up knowledge as a student). On of our class even had to construct one for a Duplo slide. It took him and two teachers about 3 hours to find out how to construct the cavity in the mold in order to eject it from it.
As a process technician in Injection Stretch blow molding and Injection molding, this is such an informative and accurate video on our industry. Thank you.
Very nice. I am an injection molding process technician with 30 + years in the business. Your breakdown is a very informative approach to basic injection molding - great for the new guy/gal to gain an overall viewpoint of the process. Cudos to you for a clear and concise look into the process!
Lately I've been designing parts for plastic injection molding; at first I only knew the general idea but over time I've had to get more and more technical in my understanding. Even after reading a lot about the topic, this video has taught me more. There are some things I've learned recently that aren't specifically mentioned in this video: One is how to figure out which side is the core and which side is the cavity on a part. The core is the side of the mold with the ejector pins, and the cavity is the side with the injection gates. In practice, the ejector pins are never on the same side as the plastic is injected from. The core, which has the ejector pins, will be whatever side the mold engineer thinks the part is more likely to stick to when it shrinks during cooling. In practice this means that the core will be the side that has the most tooling enclosed by the part, or it will be the side that has the shallowest draft angle. I recently designed a part and was surprised that the vendor didn't want to put the ejector pins on the side that I was expecting, and then again I was surprised when the injection points couldn't be on the side I was expecting either. Another thing: the vendor used what are called submarine gates, which come in at 90 degrees to the pull direction and are designed to shear the sprue off of the part as the mold opens. Learning about this was fascinating.
Thanks Bill for the explanation. In my apprenticeship we had injection molding machines, I used to feed the hopper. Back in the 70's the Italians were the "kings" of molders. We had a big tool shop that made so many molds.
Interesting that Italians were the kings of moulders, maybe because they are such great craftsman. Also to see the lineage of machines (made in Italy) move forward to the ten ton press that Tesla bought to make huge cast aluminum parts.
Once upon a time, I was to be a U of I student. I chose a different path, and never found my way back to school to get a degree. I feel like if I would have had teachers like this, I would have stayed in school. Thank you for making these amazing videos. I appreciate your work because it shows how amazing even simple household objects are. Thanks again.
As a professional injection moulding productions sales in this field，i can surely say this is the most clearest video to the explanation of injection machine
I'm a mechanical engineer and I just discovered your channel with this video, I had so much fun watching it, the description so accurate, and it seems the only thing left for me to do now is to binge the rest of your content
I love this comment. It's so true. In building my house, I did end up buying some books, but most were disappointing. I could've done it with only freely-shared knowledge. When thinking about the evils of social media echo chambers and tailored search results, it's important to remember how much good the internet brings us. How freely available information is. There are problems. Not all the information is factual, and not all is as available as it should be. We're still learning how to live with this amazing new tool. But the world has been made so much better. And the *unutterably* valuable ability to *learn* has been made so much more available.
@@GhotiCan this certainly isn't a complet explanation on the subject, but it's great for getting people interested into it. Channels like this one may develop a love for science and engineering in little kids, such as it happened with me.
Don't be too impressed. It's a sign of the End Times. "...seal the book until the time of the end. Many will roam to and fro, and knowledge will increase." Daniel 12-4
I am glad I stumbled upon this video BEFORE my chapter test on "Molds" in Solidworks. This video helped me understand and visualize the process soooo much better than it was ever explained to me in class! The lightbulb in my head has exploded and now I understand why I have to design with drafts and cavities on every single assignment. :-) Thank you!
I work in a factory that does injection molding of ABS, PS and rubber too, used for shoes manufacturing, mainly soles and heels The machines are indeed very simple despite looking overly complex! To think that we still have fully functional 1970s machines that work only on relay logic and nothing more, and nearby computerized machinery, doing exactly the same job, every day 24hrs a day
I am my shift's maintenance guy at a plastics plant where we do both injection and blow molding. Injection is by far my favorite and this was a tremendous explanation. On the subject of part ejection and vacuums: depending on the desired product design the mold manufacturer may add air poppets that open ever so slightly to blow air into the molded part to release the vacuum. We make 5 gallon/20 liter pails that require aie because the vacuum is too strong for a mechanical ejector. In fact our molds don't have mechanical ejectors at all, they use pressurized air to blow the buckets off the mold and onto a conveyor belt. These molds don't require a hot runner (but the mold that makes the lids does). Super cool stuff honestly, I love my job!
What didn't occur to me but recently is that the 3D design most allow for the object to be pushed out of the mold. There can't be overlapping structures that would obstruct the line of draw.
This is one of the best videos I've watched describing injection molding. Great job simplifying the process so most can understand it and opening the door to the more intricate side of mold making and processing.
Man I've been in high speed plastics for 8 years. Specializing in closure and preform injection molding and PET blow molding. I was so excited to watch this. Couldn't wait to make a comment about hot runners, but then he brought them in!! Having toured multiple injection press and mold shops, this really hit a special note for me.
Hi Bill, This is the first of your videos I've viewed. Very informative! I've been in the plastics business for about 20 yrs. and had no idea that's how injection molding started. I knew that celluloid was invented to replace Ivory, but not that this was the start of injection molding. I'm afraid you wouldn't find ejection pin marks on the product the Co. I work for produces. The parts are too thin, so are ejected by air. Think yogurt or butter containers. Other than that, you're spot on. Thank you from a new subscriber!
I hope this comes out the way it is intended to be understood. I am a recently retired Colonel in the US Marine Corp. I can honestly say that during my lifetime I have had to listen to many technical lectures about just about everything you can imagine many of which had the same overall effect on myself as well the rest of the room full of other officers. However I can honestly say that only two speakers I can honestly say have had a certain tone in there voice that have made it interesting to learn about a subject. The first man was an officer in the US Air Force the Legendary Brain Shul a gentleman I have had the pleasure of listening to several times in my lifetime, the second was YOU! Your voice has a tone that keeps everything you talk about interesting and I also look forward to listening to more of the topics you describe. You truly have a way with words.although I am up there in age I still enjoy learning from people that know how to teach and make things interesting enough to pay attention. You two gentlemen know how to tell a story and keep a person interested enough to want to hear more. I thank you for all that you have made me appreciate the fact that I was not to old to learn. Thank You for taking the time to make learning enjoyable again . Col. Tom USMC
@@JustWasted3HoursHere Actually, no. The data on the CD/DVD is injection molded onto a clear poly substrate. each disc is then placed into a chamber and undergo a process called "sputtering" which moves atoms from an aluminum block to the disc's surface, making the disc reflective. In the case of DVD9's (single side, dual layer) the bottom layer is sputtered with a translucent layer that allows the laser to basically "choose" which layer of data to read from. I'm 7 1/2 years removed from the process, so my memory isn't quite what it used to be.
8:06 "Look around you and see how many injection molded objects you can find." 'I'm pretty sure my laptop's case is injection molded.' 8:10 "Likely the device you are watching this on has injection molded parts" 'wow'
I'm a mechanical engineer and I've designed many injection molded consumer products for over 40 years that are very well known to everyone. I just want to say that this presentation is marvelous. Keep up the good work.
I'm a mold maintanance guy for a local family shop after being an operator/processor for a few years, we make small car parts for tesla, toyota etc. Never thought id be watching injection molding after work. Interesting to see a more in depth look, i learned something new thank you
He did a great job explaining this. He is a teacher, no doubt. We need a society of inquisitive minds to share our knowledge. Maybe I don't know of cyber cities that already exist. Not political, egotistical but ways to learn and connect with others who enjoys the learning part of life
Well since Nitro cellulose is gun cotton , the balls had a habit of exploding, LOLOL. They switched to Bakelite which was not explosive as soon as it was available.
I wish you were a professor in my college because your explanation is simple,clear and to the point, just the way it should be explained. You helped me for my exam sir. Thank you!
Top class tutorial as usual. No padding, no filling, no annoying music. Just straight in to the subject which is always made interesting. The way all TH-cam videos should be. Thank you.
I know everything I'm going to write is obvious but I just wanted to leave a comment in case you haven't heard these things lately. I hope you know how absolutely great your videos are! Your ability to take complex subjects and break them down for dummies like me shows your absolute mastery over not only the topics at hand but of teaching, video acoustics, filming, editing, animation, writing, and so many other things I'm sure go unnoticed. Your visuals are amazing; plainly drawn, distinctly labeled, and animated clearly. Thank you so much for what you do! Also, thanks for taking the time to add in links to videos/podcasts with more information on the subject!
I design moulds for the automotive industry for almost 5 years now. Its not an easy job but i love it. In fact, none of the steps ( designing, producing and injecting ) is easy. So many things have to be considered, and in the automotive industry the margins for error are razor thin ( i've dealt with 0,05mm error margin before ) . Before working on moulds , i never really realised how we are surrounded by thousands of plastic objects that where injected, and how each and one of them required a mould to be made. A single mould for the most "insignificant" plastic part can sometimes cost more then 100k, and take a few months to be produced, tested and delivered. Now imagine only one car, with hundreds of diferent plastic parts....hundreds of moulds...millions and millions invested......this industry blew my mind, and i wasnt even aware! Congrats on the video, well explained and interesting to watch.
I've learnt all this in school about 8 years ago, but if I saw this video back then, I'd understand it much better and faster. I think there's a lot to be changed in the educational system.
Very good explained, just one correction regarding "Lego Molds". Actually those were standard Hot Runner molds but no more in use in Lego. They are now returned to improved sprue tecnology in energy saving manners. Improved sprue means that it is basicly a "Stack" Mold meaning that during opening midle plate is also detached and robot removes the sprue with comlete gates.
Ha ha. I GUESS this is just one example of how he lacks the ability to see things from another person's perspective, on both a physical and mental level. It is pretty essential to good teaching to have the ability to convey information in a way that people can learn from. If my take on it is correct, then you have my sympathy as it means that you will have to be more proactive. Apart from that, I know it's a long shot, an anonymous logical and carefully constructed letter/email may help. After all, you walk around with flaws that either no one tells you about or tell you in a way that you are not receptive to. Criticism in the right way is often the kindest gift that you can give someone. Look at people that go on talent shows like X Factor only to be ridiculed on an international scale because family or friends thought it kinder to not criticize. If you know your weaknesses then you can work with reality. Cheers for sharing.
One reason why Legos are expensive is because they're some of the highest quality, and highest precision examples of injection molding anywhere. The tolerances and durability found in Lego parts rivals anything form other industries.
I will pass these excellent videos on to others who are convinced that "today" is rubbish and we should all regress to the "good old days" when tuberculosis was tuppence a pound and your Granny never got cancer because she died young during childbirth or of a broken gangrenous limb. Rotted food, or even the lack thereof, was all the go. I live well and cheaply in a major city and give thanks every day for the collective brilliance of the human race's ingenuity. Thanks for these videos. Education is never wasted.
Hey Bill, One of my favorite things about your videos are your super clear animation models. As a 3D modeler myself, do you model these pieces yourself? How do you do it? Thanks, and keep going!
My grandfather worked for Lombard many years ago and patented a plastic injection mold system. It is a screw design. According to my father it helped revolutionize the industry and helped make Lombard a major player for a while.
professor where were you when I went to Cal? man you are GOOD... Period . I rather have my kids watch you then go to college to listen to a semi mediocre professors.
Well done Professor, from one engineer to another, I say bravo. Your educational work is top notch, inspiring, and consistent with the rearing nature of someone who cares for his fellow man. Bravo!
My father designed moulds and manufactured them. He also had a production line with numerous machines, British built (Newbury) and had the distinction of being able to convert imperial measures to metric and vice versa in his head. This was because we moved to the U.S. in the 1980's. Thanks for the video, it's a great reference to a life I lived long ago.
This is exactly what I needed. I was interested to learn more about how injection molding works, and this video could not have been more perfect! Thanks for this!
I'm in the plastic model kit building hobby, and I'm very used to speak about "sprues" to which the parts are attached. Today I learned they are actually called runners :)
The terminology seems to vary a little by branch in the hobby, Gunpla circles tend to refer to the entire sheet (runners, gates, parts, and sprues) as Runners.
This video about plastic injection molding is on display and on repeat at the Griffin Museum of Science and Industry in Chicago, IL next to their Mold-A-Rama Exhibits!! I was SO excited to see your video there!!
I was driving home one day last week was thinking about how my neighbor's mailbox post is short like her, and then looked at mine and wondered how much longer it would last. Next day I see an add for mailbox posts while flipping through the stories on my home page. It would be different if I talked about it because I know how that works, but just thinking about it?!
Wow, this is my new favorite channel! I wish this would have been around when I was a young man, just interested in all things mechanical and electrical. What a great resource. Thanks for sharing your knowledge.
Now I am engaged in the business of plastic injection molding. I am very grateful that this video has let me know this great industry. I am looking forward to cooperating with more mold projects
Almost... At 1:40 you can observe that the Sticks to throw Out are pushed Back by the Wall of the right Side of the molding Tool. In reality those are pulled Back by the machine before closing.
Could you tell me why only the use recycled material is limited to around 15% , what constrains its increase?Excellent video and amazing animations.Thanks a ton.
+Akshay Pai Raikar Typically recycled material doesn't behave like virgin material. This is true in many processes. For example, in the aluminum can there are two different alloys -- one used for the top and the other for the sides. You can recycle the top into the sides, but not the other way around. Here's how another commenter expressed the problem with using more than 15% recycled material: "Polymers are long chain molecules. When you pass it through the injection screw, shear forces melt the material but also break up a fraction of the molecular chains. This means that the material that comes out the nozzle of the injector is not as good as the material that went into it. So when you recycle that material you are adding another shear history to it, meaning even more molecular chains will be broken. By limiting the amount of recycled material to 15% it prevents complications in the finished part due to material degradation." That's likely correct. In general: the history of a material is as important as what it is ... this isn't obviously if you are not schooled in the art!
+Akshay Pai Raikar 15% is not typical, ive worked placed where we've used 60% regrind (and the manager wondered why parts we made were shit-tier) Think of it like this, you cook a hotdog. tasty right? but you've got left overs, warm them up the next day, and the next, and the next, overtime the hotdogs get burnt to hell and are inedible. Your hotdogs are not plastic ;D I am not good at analogies
***** Thanks a lot for the brilliant explanation btw Thanks for making these amazing videos I really appreciate the effort you put into making them . Timothy W The analogy drove home the point Thanks.
hi, i work in a plastic manufacturing company, and i was working as a material handler at one time there and can tell you why some products may require only a 15% recycled material allotment. as you use more recycled material or as we call it, regrind, or in other words, scrap parts, sprues, runners that we grind up at the plant, can degrade over times molded so will degrade quality depending on regrind used. some parts are fussier than others so require lesser regrind, or in some cases strictly virgin or unused material. some materials we use can vary from 20% to 50% regrind mix, and some 0% like brake parts we make. like plastic pulleys we make can be 50% to 20% mix, most are usually 20% mix since most pulleys are ment to last. so basically it depends on how the customer wants the part to come out and how fussy they are :). hope this clears things up a lil :)
Just recently discovered this channel and I am already completely hooked! The soothing voice, the clear explanations, no "sponsor shout outs", no "hit the subscribe" demands. Just pure knowledge and information! Great job!
Thank you a lot, engineerguy. I've got a homework about this great process and I didn't found better information than this video. You helped me to know an excellent info and valorate the extrusion process.
I always remember the pair of boots I had that had the date stamp from the mold embedded in the sole. I wonder how many boots went out without a date stamp and a huge protrusion instead! The lump of metal from the mold with the numbers was about 10mm long and about 8mm diameter!
Did you cut the stamp out? I'm confused how you saw the dates because that part would have been embedded in the sole, you would only see the back side of the stamp.
I worked at Shopvac for 24 years. When we would switch from one color to another, the first few rejected parts would come out all looking tie-dyed as they mixed the previous color with the new one in interesting patterns. Normally, these would be put in the grinder and recycled, but some folks took them home and made a sort of 'hippie' Shopvac! 🙂
As a private home-school tutor, I teach Design & Technology to an autistic child. This was very educational. He loved it. He loves Lego, especially as he is visiting Legoland in late April.
Your video is so crisp, I couldn't tell it was 7 years old. The way people were shooting back then was terrible, and looks dated nowadays. Your 1080p video passes for 4K.
I'm a Tool and Die maker. I make plastic injection molds.......this is the best video I've ever seen describing the whole process of plastic injection molding
VERY educational video, love it! I have a question-At about 3:22, where you press the pellets closer together at the end of the screw, how does the remaining air escape so you aren't injecting bubbles into the mold?
+Andrew Taylor Actually, upon first "shots", beginning of the molding process startup, you can get bubbles in the parts. Usually it's not bubbles, but simply incomplete parts, called short shots. Once the air is worked out (usually only one or two cycles) molten plastics fills the barrel. During the plasticating portion of the cycle, more molten material is fed up the screw to the front and builds up pressure and actually pushes the whole screw assembly rearward, so no new air is introduced to the barrel. Thanks for the video engineerguy. The best description of the injection molding process I have ever seen.
+Andrew Taylor you can call Adkev in Goodland , Indiana I work there it is a plastic injection molding plant ,or if you feel froggy you may even get a tour of the facility
I have been worked as a sales for a plastic injection molding company for more than 6 years. As per my experience, to avoid bubbles in the parts: 1) the part design should be even in thickness 2) suitable temperature 3) reasonable air vent design 4) operator experience, no air in
I made plastic injection molds for 35 years, and that was the most precise description of the process that I could wish for. Great work!
sick
@@austinh7967 @Jack Frost that means “cool” in boomer terms
@@derekzhu182 you're a dumb ass.. That means dumb ass in your case..
😂
Hi Jack, glad to contact you here. This is Sophia from China, we do the same field abt injection molding, may I know your email? My email is sophia@weichuangmfg.com
@@sophiazhang3600 Hi Sophia. Hope you are well.
Nothing better after a day's work than to have dinner, pour a glass of wine and watch a video about plastic injection molding.
classic!
Use a plastic glass.
Great introduction. That is just what we do. We produce plastic injection molds and then do mass production using the molds. Very small quantity like thousands or hundreds is accepted. www.rpimoulding.com sales01@rpimoulding.com This is Vicky from Xiamen, China.
@@responplasticindustrialco.5218 Vicky, is there a video somewhere how the radio shells (cabinets), small and large, are made using injection molds
unless you work in that industry... then you search mistakes and ideas...
This guy is the David Attenborough of engineering!
I love David Attenborough!
I literally just thought of that too, good spot
The same vibe I got from this video. Binge watching his playlist 😂
Perfect Analogy
i was thinking the same thing
I’m a maintenance mechanic at a plastic injection molding plant. I rebuild and maintain these machines. If someone asked to explain the principles involved I don’t think I would have done it as well. Our molds don’t have hot runners, or date stamps so I actually picked up some knowledge. Good video sir.
we specialize in mold design/fabrication, perhaps we can help.
@@HANSENMold
singh,
We learn every day
Can you give me some information or advice? I go in for an interview today for maintenance at a place that does injection molding. Any tips?
@@nikywest5988 i am doing an intership prorgam at that place, injection machine
_Dari __#PureTuber_
I designed injection molded parts for over 38 years. This video is on of the most thorough presentations of the molding process. This video with help new designers and engineers explain why it will take weeks to complete a mold due to strength of the pressures and the precision, and complexity of cooling the mold. Hats off!
男: 你郁出面的人, 我当你黑吃黑, 不过, 要遵守香港法例,
This guy is THE epitome educator! Clear, concise, and informative! Always a pleasure to watch his videos!
Let us not forget … an engaging delivery !!
@@mtdewchallenger
kerry logistics
Hey Bill. Thank you for returning to TH-cam, I enjoy the way you explain things I normally don't think about. Have a fantastic day
+Mr. Emil I have never left TH-cam: It just takes a long time to make videos.
+engineerguy get patron please!!!
+Morgan Brolin I agree,
Take my money
+Morgan Brolin *patreon
+engineerguy You may want to consider signing up for a Patreon
After spending over 25 years as an injection mould toolmaker I thought I knew just about all there was to know. This is an excellent educational video that I have benefitted from watching and learnt much more than I expected. Many thanks for posting this.
viet-cong,
Hey, I was working on a product and needed help with the moulds. Is there anyway I could get in contact with you to ask you some questions?
I work in the Injection-mold department, assembling products. Love it!
Where are you located , Donald?
I am from India and would like to get some valuable business orders.
Can you help me out???
Thanks
Viswanathan
If you need help getting these plastic or metal parts made, this guy can help:
www.linkedin.com/in/roopen-bundhoo/
Hope this helps
As an industrial designer, I wish they would have taught this information in college as thoroughly as this video did in less than 10 minutes… would have saved me the trouble of piecing it together on my own bit by bit over a couple of years.
Hey, I was working on a product and needed help with the moulds. Is there anyway I could get in contact with you to ask you some questions?
I'd just like to add that the water pumped round the tool isn't always cold. Where I work we regularly use water anywhere between 20*C and 80*C depending on the mould size and the material used for that job. We've even had moulds go up to 130*C for glass filled lens housings.
Thanks for sharing this .... interesting info.
Absolutely agree with the Lego part. Our teachers often tell us how incrediblely complex and well-constructed the Lego parts are and what huge amount of engineering know-how went into making them. This year we even got the challenge to construct a mold for a Duplo part (A little bit easier but still great to build up knowledge as a student). On of our class even had to construct one for a Duplo slide. It took him and two teachers about 3 hours to find out how to construct the cavity in the mold in order to eject it from it.
WOW...the dedication on the quality and details of this video is just amazing! You guys are true heroes to those who love to learn!
After spending 200 years making injection plastic I can say for sure this guy knows what he's talking about!
You are my hero in this comment section
inject me baby
just 200?
Thank u sir for your long service
Wow, you're old.
As a process technician in Injection Stretch blow molding and Injection molding, this is such an informative and accurate video on our industry. Thank you.
worked in a molding plant for 5 years, very good introduction.
What company?
Very nice. I am an injection molding process technician with 30 + years in the business. Your breakdown is a very informative approach to basic injection molding - great for the new guy/gal to gain an overall viewpoint of the process. Cudos to you for a clear and concise look into the process!
Do you need a degree for this? Or do they train you at the site?
I can watch you explain anything and be completely entertained and educated. Love your videos.
What a tragic response to a valid (and intelligent) observation. Ignorance strikes deep, I suppose.
Nic Parker - mate..... what in the mother of hell are you on about?
Nic Parker - Who hurt you? Someone must have for you to have such a negative view of a positive thing.
GabrielP For real though, hes butthurt beyond levels ive ever seen.
Nic Parker hahaha what??? Out of NOWHERE 😂😂
Lately I've been designing parts for plastic injection molding; at first I only knew the general idea but over time I've had to get more and more technical in my understanding. Even after reading a lot about the topic, this video has taught me more. There are some things I've learned recently that aren't specifically mentioned in this video: One is how to figure out which side is the core and which side is the cavity on a part. The core is the side of the mold with the ejector pins, and the cavity is the side with the injection gates. In practice, the ejector pins are never on the same side as the plastic is injected from. The core, which has the ejector pins, will be whatever side the mold engineer thinks the part is more likely to stick to when it shrinks during cooling. In practice this means that the core will be the side that has the most tooling enclosed by the part, or it will be the side that has the shallowest draft angle. I recently designed a part and was surprised that the vendor didn't want to put the ejector pins on the side that I was expecting, and then again I was surprised when the injection points couldn't be on the side I was expecting either. Another thing: the vendor used what are called submarine gates, which come in at 90 degrees to the pull direction and are designed to shear the sprue off of the part as the mold opens. Learning about this was fascinating.
97 回歸之前, 周星馳申請移民加拿大, 加拿大移民局查到周星馳是演員, 長期和新义安中国星集团合作拍电映, 有身為三合会会員的嫌疑, 推翻了周星馳的移民申請, (英文南华早报, )
Thanks Bill for the explanation. In my apprenticeship we had injection molding machines, I used to feed the hopper. Back in the 70's the Italians were the "kings" of molders. We had a big tool shop that made so many molds.
Interesting that Italians were the kings of moulders, maybe because they are such great craftsman. Also to see the lineage of machines (made in Italy) move forward to the ten ton press that Tesla bought to make huge cast aluminum parts.
@@giggleherz
工联会两次声明, 在他們眼中, 广华医院是禽獸医院, 免費医疗是糖衣毒藥, 使貧苦病人对三合会感恩,
As a kid, I studied the marks of injection molding on household objects without knowing how they were poured. Thanks for revealing the mystery.
How on earth does this guy make something as ordinary as plastic seem infinitely interesting? Thanks for the videos Bill!
because plastic is still new at least in the grand scheme of things.
Once upon a time, I was to be a U of I student. I chose a different path, and never found my way back to school to get a degree.
I feel like if I would have had teachers like this, I would have stayed in school.
Thank you for making these amazing videos. I appreciate your work because it shows how amazing even simple household objects are.
Thanks again.
Well, yes. It's hard to find teachers as good as Bill. I had a couple of them and that was enough to let me have a career in engineering.
@@soaringvulture
你們在工廠有实际工作經驗, 都是很珍貴的, 有些工程師实习生來到金属品制造业訓練中心, 問一些沒有工廠常識的問題, 你們至少不会这样問, 我会覺得他們奍尊処优, 对著塑胶机站半天也喊累, 要找一張椅子, 如果台海爆發战役, 你們这些略懂机械加工的工人, 就日形重要, 因為兵工廠要日以継夜生产枪枝彈藥, 供給前線的士兵,
As a professional injection moulding productions sales in this field，i can surely say this is the most clearest video to the explanation of injection machine
I'm a mechanical engineer and I just discovered your channel with this video, I had so much fun watching it, the description so accurate, and it seems the only thing left for me to do now is to binge the rest of your content
this is insane. valuable information is so cheap these days.
I love this comment. It's so true. In building my house, I did end up buying some books, but most were disappointing. I could've done it with only freely-shared knowledge. When thinking about the evils of social media echo chambers and tailored search results, it's important to remember how much good the internet brings us. How freely available information is. There are problems. Not all the information is factual, and not all is as available as it should be. We're still learning how to live with this amazing new tool. But the world has been made so much better. And the *unutterably* valuable ability to *learn* has been made so much more available.
Not sure I'd call this valuable information, lol
@@GhotiCan I'm not sure if you're particularly bright.
@@GhotiCan this certainly isn't a complet explanation on the subject, but it's great for getting people interested into it. Channels like this one may develop a love for science and engineering in little kids, such as it happened with me.
Don't be too impressed. It's a sign of the End Times. "...seal the book until the time of the end. Many will roam to and fro, and knowledge will increase." Daniel 12-4
I am glad I stumbled upon this video BEFORE my chapter test on "Molds" in Solidworks. This video helped me understand and visualize the process soooo much better than it was ever explained to me in class! The lightbulb in my head has exploded and now I understand why I have to design with drafts and cavities on every single assignment. :-) Thank you!
I work in a factory that does injection molding of ABS, PS and rubber too, used for shoes manufacturing, mainly soles and heels
The machines are indeed very simple despite looking overly complex! To think that we still have fully functional 1970s machines that work only on relay logic and nothing more, and nearby computerized machinery, doing exactly the same job, every day 24hrs a day
I am my shift's maintenance guy at a plastics plant where we do both injection and blow molding. Injection is by far my favorite and this was a tremendous explanation.
On the subject of part ejection and vacuums: depending on the desired product design the mold manufacturer may add air poppets that open ever so slightly to blow air into the molded part to release the vacuum. We make 5 gallon/20 liter pails that require aie because the vacuum is too strong for a mechanical ejector. In fact our molds don't have mechanical ejectors at all, they use pressurized air to blow the buckets off the mold and onto a conveyor belt. These molds don't require a hot runner (but the mold that makes the lids does). Super cool stuff honestly, I love my job!
What didn't occur to me but recently is that the 3D design most allow for the object to be pushed out of the mold. There can't be overlapping structures that would obstruct the line of draw.
This is one of the best videos I've watched describing injection molding. Great job simplifying the process so most can understand it and opening the door to the more intricate side of mold making and processing.
great video
underrated and forgotten beauty of Mechanical Engineering.
What separates us from other animals? Plastic injection molding.
Animals and humans are made of plastic themselves! We are synthesizing tones of plastic inside our bodies.
Yeah, if Orcas and dolphins are so damned smart, why aren't they pushing out seal meat in their own injection molded factories?!
Mass murder and cruelty
I bet your real fun at parties
Human beings are the only animal that eats Tabasco.
I am just starting at Plastic industry as a maintenance at Engel Global machines, this video helped me a lot in my first steps. Thank you Bill Hammack
Man I've been in high speed plastics for 8 years. Specializing in closure and preform injection molding and PET blow molding.
I was so excited to watch this. Couldn't wait to make a comment about hot runners, but then he brought them in!!
Having toured multiple injection press and mold shops, this really hit a special note for me.
Your videos are always perfect.
M.A.K I agree
Love your animations. Thank you for putting so much thought and research into your videos.
Hi Bill,
This is the first of your videos I've viewed. Very informative! I've been in the plastics business for about 20 yrs. and had no idea that's how injection molding started.
I knew that celluloid was invented to replace Ivory, but not that this was the start of injection molding.
I'm afraid you wouldn't find ejection pin marks on the product the Co. I work for produces. The parts are too thin, so are ejected by air. Think yogurt or butter containers.
Other than that, you're spot on.
Thank you from a new subscriber!
Been in Injection Molding since 1994, started as a operator and is now the Plant Manager. I always loved injection Molding,.
I hope this comes out the way it is intended to be understood. I am a recently retired Colonel in the US Marine Corp. I can honestly say that during my lifetime I have had to listen to many technical lectures about just about everything you can imagine many of which had the same overall effect on myself as well the rest of the room full of other officers. However I can honestly say that only two speakers I can honestly say have had a certain tone in there voice that have made it interesting to learn about a subject. The first man was an officer in the US Air Force the Legendary Brain Shul a gentleman I have had the pleasure of listening to several times in my lifetime, the second was YOU! Your voice has a tone that keeps everything you talk about interesting and I also look forward to listening to more of the topics you describe. You truly have a way with words.although I am up there in age I still enjoy learning from people that know how to teach and make things interesting enough to pay attention. You two gentlemen know how to tell a story and keep a person interested enough to want to hear more. I thank you for all that you have made me appreciate the fact that I was not to old to learn. Thank You for taking the time to make learning enjoyable again . Col. Tom USMC
Its just perfect, this guy is going into such a detail in very limited time frame without making a single mistake. There is no room for improvement.
I used to work at a CD/DVD manufacturing plant. This is exactly how we did it.
I thought the reflection surfaces were stamped in those.
@@JustWasted3HoursHere Actually, no. The data on the CD/DVD is injection molded onto a clear poly substrate. each disc is then placed into a chamber and undergo a process called "sputtering" which moves atoms from an aluminum block to the disc's surface, making the disc reflective. In the case of DVD9's (single side, dual layer) the bottom layer is sputtered with a translucent layer that allows the laser to basically "choose" which layer of data to read from. I'm 7 1/2 years removed from the process, so my memory isn't quite what it used to be.
8:06 "Look around you and see how many injection molded objects you can find."
'I'm pretty sure my laptop's case is injection molded.'
8:10 "Likely the device you are watching this on has injection molded parts"
'wow'
I'm a mechanical engineer and I've designed many injection molded consumer products for over 40 years that are very well known to everyone. I just want to say that this presentation is marvelous. Keep up the good work.
I'm a mold maintanance guy for a local family shop after being an operator/processor for a few years, we make small car parts for tesla, toyota etc. Never thought id be watching injection molding after work. Interesting to see a more in depth look, i learned something new thank you
The diagrams and animations are the best I've seen when it comes to manufacturing processes.
He did a great job explaining this. He is a teacher, no doubt. We need a society of inquisitive minds to share our knowledge. Maybe I don't know of cyber cities that already exist. Not political, egotistical but ways to learn and connect with others who enjoys the learning part of life
SO WHO WON THE BILLIARD BALL CONTEST?!
No winner was officially announced.
@@almo9004 WHAT ARE THEY MADE OF NOW?
Well since Nitro cellulose is gun cotton , the balls had a habit of exploding, LOLOL. They switched to Bakelite which was not explosive as soon as it was available.
WHO’S NEXT??
YOU DECIDE! !
I wish you were a professor in my college because your explanation is simple,clear and to the point, just the way it should be explained. You helped me for my exam sir. Thank you!
Top class tutorial as usual. No padding, no filling, no annoying music. Just straight in to the subject which is always made interesting. The way all TH-cam videos should be. Thank you.
No filling? Do you mean N O I N J E C T I O N P L A S T I C M O L D I N G
Mike No no no. Video is fine. I love them. What I was saying is that there is no unnecessary padding or filling out to make the video last longer.👍☘️
First aluminium cans and now plastic molding, what's next TH-cam?
Micro oven
Forging and injection molding techniques for wood.
same ;D
Theres a good video about Nerf air restrictors.
Do you realize how great is it? Perfect content.
I know everything I'm going to write is obvious but I just wanted to leave a comment in case you haven't heard these things lately.
I hope you know how absolutely great your videos are! Your ability to take complex subjects and break them down for dummies like me shows your absolute mastery over not only the topics at hand but of teaching, video acoustics, filming, editing, animation, writing, and so many other things I'm sure go unnoticed. Your visuals are amazing; plainly drawn, distinctly labeled, and animated clearly. Thank you so much for what you do!
Also, thanks for taking the time to add in links to videos/podcasts with more information on the subject!
I enjoy the way you explain things as well. The 3d animation of how the parts work is amazing. Thank you for taking the time to make these videos.
I design moulds for the automotive industry for almost 5 years now. Its not an easy job but i love it. In fact, none of the steps ( designing, producing and injecting ) is easy. So many things have to be considered, and in the automotive industry the margins for error are razor thin ( i've dealt with 0,05mm error margin before ) .
Before working on moulds , i never really realised how we are surrounded by thousands of plastic objects that where injected, and how each and one of them required a mould to be made. A single mould for the most "insignificant" plastic part can sometimes cost more then 100k, and take a few months to be produced, tested and delivered. Now imagine only one car, with hundreds of diferent plastic parts....hundreds of moulds...millions and millions invested......this industry blew my mind, and i wasnt even aware!
Congrats on the video, well explained and interesting to watch.
I've learnt all this in school about 8 years ago, but if I saw this video back then, I'd understand it much better and faster.
I think there's a lot to be changed in the educational system.
Very good explained, just one correction regarding "Lego Molds". Actually those were standard Hot Runner molds but no more in use in Lego. They are now returned to improved sprue tecnology in energy saving manners. Improved sprue means that it is basicly a "Stack" Mold meaning that during opening midle plate is also detached and robot removes the sprue with comlete gates.
Please be my professor, instead of the lunatic I have now
Ha ha. I'm intrigued about your professor now. If you want to off load then I'd be happy to hear it.
Ultimattttt he was yelling at the guys using weed whackers outside, from the second floor.
"HELLO? CANT YOU SEE WE HAVE CLASS IN HERE?"
Ha ha. I GUESS this is just one example of how he lacks the ability to see things from another person's perspective, on both a physical and mental level. It is pretty essential to good teaching to have the ability to convey information in a way that people can learn from.
If my take on it is correct, then you have my sympathy as it means that you will have to be more proactive. Apart from that, I know it's a long shot, an anonymous logical and carefully constructed letter/email may help. After all, you walk around with flaws that either no one tells you about or tell you in a way that you are not receptive to. Criticism in the right way is often the kindest gift that you can give someone. Look at people that go on talent shows like X Factor only to be ridiculed on an international scale because family or friends thought it kinder to not criticize. If you know your weaknesses then you can work with reality.
Cheers for sharing.
I don't know... a great engineer is always a bit of a lunatic.
It doesn't matter how good of an engineer he is, if he can't teach it
It's like listening to a story. Great job!
One reason why Legos are expensive is because they're some of the highest quality, and highest precision examples of injection molding anywhere. The tolerances and durability found in Lego parts rivals anything form other industries.
I will pass these excellent videos on to others who are convinced that "today" is rubbish and we should all regress to the "good old days" when tuberculosis was tuppence a pound and your Granny never got cancer because she died young during childbirth or of a broken gangrenous limb. Rotted food, or even the lack thereof, was all the go. I live well and cheaply in a major city and give thanks every day for the collective brilliance of the human race's ingenuity. Thanks for these videos. Education is never wasted.
Hey Bill,
One of my favorite things about your videos are your super clear animation models. As a 3D modeler myself, do you model these pieces yourself? How do you do it? Thanks, and keep going!
This was way more enthralling than I thought.
One thing I love about this channel is the number of really smart commenters that can provide various answers to the questions!
My grandfather worked for Lombard many years ago and patented a plastic injection mold system. It is a screw design. According to my father it helped revolutionize the industry and helped make Lombard a major player for a while.
professor where were you when I went to Cal? man you are GOOD... Period . I rather have my kids watch you then go to college to listen to a semi mediocre professors.
Congrats Bill on earning the Carl Sagan Award. You deserve it. Your videos are the Cosmos of engineering.
Well done Professor, from one engineer to another, I say bravo. Your educational work is top notch, inspiring, and consistent with the rearing nature of someone who cares for his fellow man. Bravo!
can't believe I watched this whole thing and enjoyed it
My father designed moulds and manufactured them. He also had a production line with numerous machines, British built (Newbury) and had the distinction of being able to convert imperial measures to metric and vice versa in his head. This was because we moved to the U.S. in the 1980's.
Thanks for the video, it's a great reference to a life I lived long ago.
This is exactly what I needed. I was interested to learn more about how injection molding works, and this video could not have been more perfect! Thanks for this!
I never thought injection molding would be so interesting!
I'm in the plastic model kit building hobby, and I'm very used to speak about "sprues" to which the parts are attached. Today I learned they are actually called runners :)
The terminology seems to vary a little by branch in the hobby, Gunpla circles tend to refer to the entire sheet (runners, gates, parts, and sprues) as Runners.
I've been in the business since 1994 and I agree, that was the most concise description I have ever heard or watched. Well done! Thank you!
This video about plastic injection molding is on display and on repeat at the Griffin Museum of Science and Industry in Chicago, IL next to their Mold-A-Rama Exhibits!! I was SO excited to see your video there!!
This guy could take Mr Wizard and Bill Nye in a fight I bet.
Once again - awesome video!
Clear, concise, and full of amazing details!
His voice , his tone, .... so relaxing and immersive. Bill, you are the greatest..
I never thought this subject would be so interesting yet here I am on the edge of my seat to learn how legos are injection molded…
I was just wondering about injection molding two days ago and TH-cam recommended me this video. That means TH-cam can read my mind!!!
Je suie intéressé pour seci je veux uneinjecte manuelle porur cela
I was driving home one day last week was thinking about how my neighbor's mailbox post is short like her, and then looked at mine and wondered how much longer it would last. Next day I see an add for mailbox posts while flipping through the stories on my home page. It would be different if I talked about it because I know how that works, but just thinking about it?!
never thought I'd watch this on a Sunday night... and enjoy it. Thank you.
Wow, this is my new favorite channel! I wish this would have been around when I was a young man, just interested in all things mechanical and electrical. What a great resource. Thanks for sharing your knowledge.
If you need help getting these plastic or metal parts made, this guy can help:
www.linkedin.com/in/roopen-bundhoo/
Hope this helps
I just started working as an injection mold operator and this video has really helped me understand the overall process, thank you sir!
Hey, I was working on a product and needed help with the moulds. Is there anyway I could get in contact with you to ask you some questions?
Now I am engaged in the business of plastic injection molding. I am very grateful that this video has let me know this great industry. I am looking forward to cooperating with more mold projects
Probably my favourite channel on TH-cam!!
I am an Injection Moldmaker. Everything shown here is totally accurate and correct!
Pls how much do you charge for a plastic bottle of 330ml for yogurt? I need my own brand live in Ghana....pls reply thanks
Almost... At 1:40 you can observe that the Sticks to throw Out are pushed Back by the Wall of the right Side of the molding Tool. In reality those are pulled Back by the machine before closing.
Not entirely, the screws to melt the plastic still have some problems with inhomogeneous mixtures. (At least those shown in the video)
Could you tell me why only the use recycled material is limited to around 15% , what constrains its increase?Excellent video and amazing animations.Thanks a ton.
+Akshay Pai Raikar Typically recycled material doesn't behave like virgin material. This is true in many processes. For example, in the aluminum can there are two different alloys -- one used for the top and the other for the sides. You can recycle the top into the sides, but not the other way around. Here's how another commenter expressed the problem with using more than 15% recycled material: "Polymers are long chain molecules. When you pass it through the injection screw, shear forces melt the material but also break up a fraction of the molecular chains. This means that the material that comes out the nozzle of the injector is not as good as the material that went into it. So when you recycle that material you are adding another shear history to it, meaning even more molecular chains will be broken. By limiting the amount of recycled material to 15% it prevents complications in the finished part due to material degradation." That's likely correct. In general: the history of a material is as important as what it is ... this isn't obviously if you are not schooled in the art!
+Akshay Pai Raikar 15% is not typical, ive worked placed where we've used 60% regrind (and the manager wondered why parts we made were shit-tier)
Think of it like this, you cook a hotdog. tasty right? but you've got left overs, warm them up the next day, and the next, and the next, overtime the hotdogs get burnt to hell and are inedible. Your hotdogs are not plastic ;D
I am not good at analogies
***** Thanks a lot for the brilliant explanation btw Thanks for making these amazing videos I really appreciate the effort you put into making them
. Timothy W The analogy drove home the point Thanks.
It's not. We run 100% regrind sometimes. There is not set number
hi, i work in a plastic manufacturing company, and i was working as a material handler at one time there and can tell you why some products may require only a 15% recycled material allotment. as you use more recycled material or as we call it, regrind, or in other words, scrap parts, sprues, runners that we grind up at the plant, can degrade over times molded so will degrade quality depending on regrind used. some parts are fussier than others so require lesser regrind, or in some cases strictly virgin or unused material. some materials we use can vary from 20% to 50% regrind mix, and some 0% like brake parts we make. like plastic pulleys we make can be 50% to 20% mix, most are usually 20% mix since most pulleys are ment to last. so basically it depends on how the customer wants the part to come out and how fussy they are :). hope this clears things up a lil :)
Just recently discovered this channel and I am already completely hooked! The soothing voice, the clear explanations, no "sponsor shout outs", no "hit the subscribe" demands. Just pure knowledge and information! Great job!
He doesn't have those things in his videos due to them not being his main source of income, that's not an option for a lot of content creators
just when i thought i couldn't love legos more
Thank you a lot, engineerguy. I've got a homework about this great process and I didn't found better information than this video. You helped me to know an excellent info and valorate the extrusion process.
These videos are just marvelous. Very well done as always.
I always remember the pair of boots I had that had the date stamp from the mold embedded in the sole.
I wonder how many boots went out without a date stamp and a huge protrusion instead!
The lump of metal from the mold with the numbers was about 10mm long and about 8mm diameter!
Wow, that's one heck of an amazing
factory goof! Do you have a picture of that boot online somewhere?
Did you cut the stamp out? I'm confused how you saw the dates because that part would have been embedded in the sole, you would only see the back side of the stamp.
I suspect that it fell off after a step or two.
Good excuse if you made some stupid promise to eat your boots: Aw, look, its past its best-by date.
I worked at Shopvac for 24 years. When we would switch from one color to another, the first few rejected parts would come out all looking tie-dyed as they mixed the previous color with the new one in interesting patterns. Normally, these would be put in the grinder and recycled, but some folks took them home and made a sort of 'hippie' Shopvac! 🙂
As a private home-school tutor, I teach Design & Technology to an autistic child. This was very educational. He loved it. He loves Lego, especially as he is visiting Legoland in late April.
Your video is so crisp, I couldn't tell it was 7 years old. The way people were shooting back then was terrible, and looks dated nowadays. Your 1080p video passes for 4K.
Actually, it is not 7 years old
wow, so throughly explained !! Even with the history, I'm ready for a test paper !
I got to say you have to be one of the best presenters, love your page!
I'm a Tool and Die maker. I make plastic injection molds.......this is the best video I've ever seen describing the whole process of plastic injection molding
Was a machine operator for a while. This video is so entertaining, and really educational. Makes me want to get back into the industry.
VERY educational video, love it! I have a question-At about 3:22, where you press the pellets closer together at the end of the screw, how does the remaining air escape so you aren't injecting bubbles into the mold?
+Andrew Taylor Pretty sure it just goes out the back of the barrel. The "flights" don't make an air-tight seal with the barrel wall.
Thanks for the reply! Do you know where I can learn more about plastic extruders, perhaps a textbook?
+Andrew Taylor Actually, upon first "shots", beginning of the molding process startup, you can get bubbles in the parts. Usually it's not bubbles, but simply incomplete parts, called short shots. Once the air is worked out (usually only one or two cycles) molten plastics fills the barrel. During the plasticating portion of the cycle, more molten material is fed up the screw to the front and builds up pressure and actually pushes the whole screw assembly rearward, so no new air is introduced to the barrel. Thanks for the video engineerguy. The best description of the injection molding process I have ever seen.
+Andrew Taylor you can call Adkev in Goodland , Indiana I work there it is a plastic injection molding plant ,or if you feel froggy you may even get a tour of the facility
I have been worked as a sales for a plastic injection molding company for more than 6 years. As per my experience, to avoid bubbles in the parts:
1) the part design should be even in thickness
2) suitable temperature
3) reasonable air vent design
4) operator experience, no air in