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- Step 1: First, the plastic mixture is put into molds.
- Step 2: Gases not be immediately pumped into that after a lapse of time (very short, a few seconds) to be put in.
- Step 3: Finally, the challenge to keep (Figure II.2-1d), the mixture fills the mold under the pressure of the gas, the gas prevents the formation of dimples on the surface of the product and the thickness of the crust reaches the end Finally, it comes with the cooling process.
- Step 4: Open the mold, product defect.
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