YOSION Machinery Committed to stable performance automatic pet bottle blowing machine production line since 1990s

Introduction to the working principle of the blow molding machine

by:Yosion Machinery     2022-08-07
Blow molding machines are mainly divided into three categories: extrusion blow molding machines, injection blow molding machines and special structure blow molding machines. The processing technology is mainly divided into one-step method and two-step method. One-step and two-step blow molding processes are mainly used for PET and BOPP hollow containers. Both have their own characteristics and are widely used. In comparison, the two-step method is more suitable for concentrated production of preforms and dispersed blowing of bottles, and the one-step method is more suitable for the on-line production of beverage companies. The blowing procedure of the bottle blowing machine mainly includes six steps: 1) first put the heated preform into the mold; 2) lock the mold with a clamping cylinder; 3) lock the preform with high pressure or mechanical structure; 4) Medium and high pressure pre-blowing, expand the mold by stretching the cylinder at the same time; 5) High-pressure blowing, shape the preform according to the mold, and keep the pressure for a certain period of time; 6) Release the high pressure in the molding bottle, and reset the cylinder to——Remove the bottle. Pneumatic equipment is widely used in the operation of blowing equipment, from discharging——lock——stretch——High pressure blow/deflate——To take the bottle, this series of actions are assisted by pneumatic equipment. For example, in the stretch high-pressure blowing and degassing circuit, the gas circuit is divided into two parts, namely the normal pressure part and the high pressure part.
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