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The low molding pressures allow relatively light-weight and cheap molds to be used, even when massive gadgets similar to bumper assemblies or fridge doors are shaped. This demand following World War II New Heated Blanket was partially a end result materials shortages. For instance, rubber production was disrupted by the struggle throughout Asia and assaults on delivery lanes. Plastics stepped in to fill the hole, offering an inexpensive substitute. As plastics steadily popularized, so too did plastic injection molding. It’s effectiveness to this period was primarily attributed to efficient, inexpensive, large-scale manufacturing.