There are 2 ways to control the amount of gas in gas-assisted molding are: keep the volume (constant
volume) and keep the pressure (constant compressure)
During retain volume, the volume of the cylinder is determined in advance to set up pressure
before the gas rate, piston pushes air into the product. Pressure in the product depends on the relationship
between the volume of material relations and could be a cylinder. Time to keep air speed is determined and
controlled piston product profiles. The graph above shows the formation III.4-1 pressure changes according to
the time inside the product, for each molding cycle, the pressure must be determined before
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