Plastic Additives

Additives for Blow Molding Processes

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For manufacturing hollow parts from thermoplastic plastics, blow molding is widely used. In this process a so-called preform is produced which is then blown into a hollow part.  Blow-moldable thermoplastics include e.g. polyolefins, polyamides, polyester and POM.

Plastic bottles created by the Blow Molding Process

To create hollow parts from thermoplastic plastics, blow molding is a widely used process. There are two standard processes established; extrusion blow molding and injection stretch blow molding. In extrusion blow molding, a hose is extruded into a blowing tool. When closing the tool, excess hose parts are squeezed off into cut-offs. The inside of the hose is then pressurized until it sits against the tool wall, and this way receives its desired form. By cooling down the part solidifies into a thermoplastic hollow body. In injection stretch blow molding, the injection-molded preform is heated in the blowing tool, and then also inflated until it sits against the tool wall and solidifies. Typical applications are plastic bottles, air pipes, but also high volume parts such as barrels and tanks.