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Another canadian mold makers using screw-and-barrel machines is YTC, which has made parts weighing less than 0.0008 g. The key to molding on this scale is getting the right amount of plastic into the mold—also known as "dosing the shot," according to YTC. When molders don't accurately dose their shots, they risk overpacking their parts, which can cause the parts to stick in the mold or even to break it according to canadian mold makers and YTC.

According to YTC, molders who want precise shot dosing can buy electric injection machines with servomotors capable of very accurate screw positioning. Or, if they plan to stick with hydraulic machines, molders can install a valve gate that shuts when the right amount of plastic has been injected into the mold.


The Sesame, by canadian mold makers, is a small electropneumatic machine named for the part size it produces.

A new option for canadian mold makers is an injection machine that replaces the traditional screw with a motor-driven plunger. Named for the part sizes it produces, the Sesame is a small electropneumatic micro molding machine made by Hull Corp. (Warminster, PA). The machine can mold 20 thermoplastic "sesame seeds" from a single pellet, according to YTC Taiwan.