First, the plastic mixture is put into molds (Figure II.2-1a) Gas not immediately pumped into that after a lapse of time (very short, a few seconds) to be inserted (Figure II. 2-1.b). This delay in order to establish lieuran external physical layer product called the crust. Coating thickness depends on the time delay, short time delay makes the crust thinner thickness desired. The thickness of the coating also depends on the volume of the liquid mixture in the cavity. The mission of the crust is penetrated air pressure prevents product.
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