The working principle of bottle blowing machine
Release time:
2024-04-09
A blow molding machine is a device that uses a blow molding process to make plastic particles into hollow containers. Currently, the more common models include a one-time molding hollow extrusion blow molding machine using PP and PE, a two-time molding injection stretch blow molding machine using PET, PC or PP, and the newly developed multi-layer hollow extrusion blow molding and stretch blow molding machines. 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 bottle embryos first, and then blown. Nowadays, environmentally friendly plastics made of PET are generally used. Blow molding machines use the wind force blown out by the machine to blow the plastic body into a certain shape of mold cavity after the liquid plastic is sprayed out, so as to make a product. This machine is called a blow molding machine. It is also a type of blow molding machine, that is, a hydraulic blow molding machine.
A blow molding machine is a device that uses a blow molding process to make plastic particles into hollow containers. Currently, the more common models include a one-time molding hollow extrusion blow molding machine using PP and PE, a two-time molding injection stretch blow molding machine using PET, PC or PP, and the newly developed multi-layer hollow extrusion blow molding and stretch blow molding machines.
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 bottle embryos first, and then blown. Nowadays, environmentally friendly plastics made of PET are generally used. Blow molding machines use the wind force blown out by the machine to blow the plastic body into a certain shape of mold cavity after the liquid plastic is sprayed out, so as to make a product. This 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 preform obtained by extrusion or injection molding of thermoplastic resin is heated to a softened state and placed in a split mold. After the mold is closed, compressed air is immediately introduced into the preform to inflate the plastic preform and cling to 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 and two-step methods. The 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 centralized production of preforms and decentralized blowing of bottles; while the one-step equipment is more suitable for online production of beverage companies.
The blowing process of the plastic bottle blowing machine mainly consists of 6 steps: 1) First, put the heated plastic embryo into the mold; 2) Use the locking cylinder to lock the mold; 3) Then use high pressure or mechanical structure to lock the embryo mold; 4) Pre-blow with medium and high pressure, and at the same time stretch the cylinder to expand the embryo mold; 5) High-pressure blowing, the bottle embryo is shaped according to the mold, and the pressure is maintained for a certain period of time; 6) Release the high pressure in the formed bottle, reset the cylinder - take the bottle.
Pneumatic equipment is widely used in the operation of bottle blowing machines; from unloading - locking - stretching - high-pressure blowing\deflation - bottle taking, this series of actions are all assisted by pneumatic equipment. For example, in the stretching high-pressure blowing and deflation circuit, the air circuit is divided into two parts, the normal pressure part and the high pressure part.
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