Plastic   Blowing Molding

Plastic Blow molding is a common process for the production of technical items with hollow bodies, ranging from basic products such as bottles to highly engineered products such as tanks and air ducting.

Extrusion blow molding is one of the two most common types of blowing and is accomplished through the extrusion of a semi-melted plastic cylinder, called parison, which is placed between two open halves of a mold. Once a parison of sufficient length is extruded, the mold is closed and a blowing pin pressurizes the inside of the parison.

Air pressure forces the parison to swell until it contacts the entire surface of the mold cavity. The heat from the formed plastic is then transferred through the mold to the cooling lines. Once the plastic is sufficiently rigid, the mold is opened and the finished product comes out.