How the blow molding machine works

Blow molding machine is a kind of equipment that makes plastic pellets into hollow containers by blow molding process. At present, the more common models include hollow extrusion blowers that use PP and PE for one molding, and PET, PC or PP for two moldings. The injection stretch blow molding machine, as well as the newly developed multi-layer hollow extrusion blow molding and stretch blow molding. At present, most of the blow molding machines are still two-step blow molding machines, that is, the plastic raw materials must be made into preforms and then blown. Nowadays, environmentally friendly plastics made of PET are commonly used. The blow molding machine is to use the wind blowing from the machine to blow the plastic body to a certain shape of the mold cavity after spraying out the liquid plastic, so as to make a product. This kind of machine is called a blow molding machine. It is also a type of blow molding machine, that is, a hydraulic blow molding machine. The tubular plastic parison obtained by extrusion or injection molding of thermoplastic resin is heated to a softened state and placed in a split mold. On the inner wall of the mold, after cooling and demoulding, various hollow products are obtained. 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 machine molding process, mainly used for PET and BOPP hollow container molding. 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; while the one-step method is more suitable for on-line production of beverage companies. The blowing procedure of the plastic bottle blowing machine mainly has 6 steps: 1) first put the heated preform into the mold; 2) use the clamping cylinder to make the mold trivial; 3) use high pressure or mechanical structure to make the mold The mold is locked; 4) Pre-blowing at medium and high pressure, while stretching the cylinder action to expand the mold; 5) High-pressure blowing, the preform is shaped according to the mold, and held for a certain period of time; 6) Release the high pressure in the formed bottle , the cylinder reset - take the bottle. Pneumatic equipment is used in many places during the operation of the blow molding machine; from discharging - locking - stretching - high pressure blowing deflating - taking bottles, this series of actions are all assisted by pneumatic equipment. Such as stretching the high-pressure blowing and venting circuit, the gas circuit is divided into two parts, the normal pressure part and the high pressure part.
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