- First, the mixture is put into molds plastic materials. (Figure a)
- Gas is not immediately pumped into that after a lapse of time (very short, a few seconds) to be inserted (Figure b). This delay in order to establish solid outer layer of material 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 the product.
- Air pressure gradually increased (Figure c), airflow tend to go to places with low resistance (the edges of the mold) optimization fill process makes plastic mixture blown away to the mold, the crust is formed with gradually increasing thickness.
- Finally, phase hold (Figure d), the mixture fills the mold under the force pressure of gas, air prevents the formation of dimples on the surface of the product and the thickness of the crust reaches the end, it comes with the cooling process.
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