Figure A. Injection MolderIn the lab that was performed, we used high density polyethylene (HDPE). HDPE is the high density version of PE plastic. It is harder, stronger and a little heavier thanLDPE, but less ductile.Injection molding has been one of the most important fabrication tools for the plastics industry. The process is used to make automotive interior parts, electronic housings, house wares, medical equipment, toys, crates, and pails, thin-wall food containers, drink cups, lids, and milk bottle caps. Results and DiscussionWhen our switch over was reduced to 4 mm, the weight of the sample increased approximately .5 grams from the initial, and the thickness stayed constant. It was a more complete fill than the original conditions. See Figure 1.Figure1. Thickness & Weight vs. Switch OverWhen our switch over was increased to 11mm, the sampleparts were incompletely filled, called short shot. Since it was an incomplete fill, the weight decreased from the original. The thickness was a little lower than the original,and the molten material did not make it to the second pressure tap. See Figure 1.When our shot size increased to 42 mm, our weight increased, which is expected since we are forcing more material into the mold. Since we are forcing more
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