Here's a fascinating post on the IDSA Materials and Processes blog about the things you can learn about injection moulding from studying the "ejection marks" on the surface of plastic objects:
So I noticed the marks on the lid of my mother-in-law's trash can and thought about what that says about how this part was made and how this might be something an industrial designer would need to understand. What I was looking at was the ejection mark placed on an angled surface. Because this large HDPE (high-density polyethylene) part will be somewhat soft when it is ejected or pushed out of the mold, the molder needed to be able to bear on several points close to the perimeter of the part (because just pushing on the middle would probably permanently distort the warm part).
Further inspection of this part also showed that the gates (injection points for the part) was on the underside, or opposite side of the part, which told me that the part probably rode back with the moving half of the mold and then was ejected after the side action (see the lip used to lift the lid?) retracted.
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Geek Fuel is a subscription delivery service that caters to those of us that love comics, gaming, and general geek culture. Every month, Geek Fuel will assemble a box of goodies with a value of $50 or over. The specific items are a mystery, but you’ll always get an exclusive t-shirt not found anywhere else, a full […]
If you like to DIY and you like helicopters, you’re going to really love the Flexbot Hexacopter Kit. This copter blows traditional models out of the water: it includes everything you need to actually build your own hexacopter, and then pilot it like a pro, too.The construction is complicated enough to give you a challenge, […]