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With physical foaming, gas compression into the extruder, the density of the products can be decreased more, and also the cell growth control becomes more feasible [1, 16]. continuous foaming is normally simply one stage extrusion, where the temperature is kept below the polymer melting point (figure 2).
Ingredient for making polypropylene (pp) and propylene copolymer resins. polyolefin resins are classified as thermoplastics, which means that they can be melted, solidified and melted again. this contrasts with thermoset resins which, once molded, cannot be reprocessed. most polyolefin resins for film extrusion generally are used in pellet form. the
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