Blow molding machine is a kind of equipment that makes plastic particles into hollow containers through blow molding process. At present, the more common models include one-time hollow extrusion
blow molding machines that use PP and PE, and use PET, PC or PP to mold twice. The injection stretch blow molding machine, as well as the newly developed multi-layer hollow extrusion blow and stretch blow molding. At present, most of the blow molding machines are still two-step blow molding machines, that is, plastic raw materials must be made into preforms before blowing. Nowadays, the environmentally friendly plastic made of PET is generally used. The blow molding machine uses the wind blown out of the machine to blow the plastic body into a certain shape of the cavity after the liquid plastic is sprayed out, so as to make a product. This kind of machine is called a blow molding machine. It is also a kind of blow molding machine, namely hydraulic blow molding machine. The tubular plastic parison obtained by extrusion or injection molding of the thermoplastic resin is heated to a softened state and placed in a split mold. After the mold is closed, compressed air is injected into the parison to inflate the plastic parison and stick to it. On the inner wall of the mold, after cooling and demolding, 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 processes are 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 blown bottles; while the one-step method is more suitable for online production of beverage companies. The blowing process of the plastic bottle blowing machine mainly has 6 steps: 1) first put the heated plastic embryo into the mold; 2) use the clamping cylinder to tighten the mold; 3) use high pressure or mechanical structure, etc. The embryo mold is locked; 4) Medium and high pressure pre-blowing, while stretching the cylinder action to expand the embryo; 5) High pressure blowing, the preform is shaped according to the mold, and the pressure is kept for a certain period of time; 6) The high pressure in the formed bottle , Cylinder reset-take the bottle. Pneumatic equipment is used in many places during the operation of the bottle blowing machine; from discharging-locking-stretching-high pressure blowing \ deflation-taking out the bottle, this series of actions are assisted by pneumatic equipment. For example, the air circuit is divided into two parts, the normal pressure part and the high pressure part.
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