Introduction of the Working Principle of Blow Molding Machine

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Blow molding machine is a plastic processing method that involves inflating softened thermoplastic parisons within a closed mold surface. The inflated parison solidifies to form a hollow plastic product. What is the detailed principle and working process of blow molding machine?

What is blow molding machine?

Blow molding, also known as hollow blow molding, is a rapidly developing plastic processing method. A tubular plastic parison made of thermoplastic resin is molded by extrusion or injection. While still hot or softened by heat, it is placed in an open mold and immediately inflated with compressed air inside the parison, causing the plastic to expand and tightly adhere to the inner walls of the mold. After cooling and demolding, various hollow products are obtained. The manufacturing process of blow-molded films is similar in principle to that of hollow products, but molds are not used. Here, we recommend you our hdpe blow molding machine.

From the perspective of plastic processing technology classification, the forming process of blow-molded films is usually considered part of the extrusion production line. The blow molding process was first used to produce low-density polyethylene bottles during World War II. In the late s, with the birth of high-density polyethylene and the development of blow molding machines, blow molding technology was widely used. The volume of hollow containers produced by blow molding can reach thousands of liters, and some productions are computer-controlled. Blow molding machines are suitable for blowing plastics such as polyethylene, PVC, polypropylene, polyester, and the resulting hollow containers are extensively used as industrial packaging containers.

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Working principle of blow molding machine

Simply put, the working principle of a blow molding machine produced by the blow molding machine factory is similar to blowing bubbles. After the plastic and the hopper enter the screw barrel of the extruder, they are pushed toward the head by the rotation of the screw thread. Due to the resistance of the filter, splitter plate, and head die at the head of the machine, as well as the gradually decreasing capacity of the screw thread, the advancing material encounters great resistance, while also being heated by the heat transmitted from the barrel. On the other hand, when the plastic is subjected to forces such as compression, shear, stirring, etc. during movement, friction between the plastic and the barrel, between the screw threads, and between plastic molecules will produce a large amount of heat. Since the temperature of the plastic inside the barrel keeps rising, its physical state gradually changes from the glassy state to the high elastic state, and finally becomes the molten state, further completing plasticization. As the screw continues to rotate, the molten plastic is extruded from the head die in a pressure-balanced and constant amount, forming a plastic product with a certain shape. After cooling and shaping, the extrusion molding work is completed.

Blow molding machine is also known as hollow blow molding, is a kind of rapid development of plastic processing methods. Blow molding machine is a machine which blow the plastic to the mould cavity with certain shape using wind when the liquid plastic start to spry out.

Blow molding machine can be divided into extrusion blow molding machine, injection blow molding machine and special structure blow molding machine.

Blow molding machine mainly composed of extruder, head, hydraulic system, the clamping system, electric control system, pneumatic system, automatic clip parts, used for blowing PE and other hollow products of a variety of materials.Such as: square barrel, round barrel, beer fresh container, toolbox, chimney, etc. It is high performance, low consumption and easy operation.

At present High-grade hollow machine on the market is developed combining with the situation of our country.Choose the high quality hydraulic components, PLC control, the most advanced first in first out the loading head,On the basis of the original traditional hollow machine advantages, combined with today's most advanced technology, its performance is more outstanding and reliable.High efficiency and applicability is up to the level of the German and Japna.The class of products will be more and more advanced. Because of the demand of the market that required high quality. And will continue to renovation and there came out new tricks.

Thermoplastic resin turn into plastic parison tube by extrusion or injection molding,Strike (or heat to soften state) in the split cavity.Immediately compressed air within the parison after closing ventilation, make plastic parison swell and clingy wall in the mold,after cooling mold release, you can get all kinds of insulating products.The principle of blown film manufacturing process is very similar to hollow blow molding.But it does not use the mould, from the perspective of classification of plastics processing technology, molding process is usually included in the extrusion of blown film.During the second world war, blow molding technology used in the low density polyethylene bottle.The birth of the late 50 s, with the high density polyethylene and the development of the blow molding machine, blow molding technology has been widely applied,The volume of the hollow container can amount to thousands of liters, some production has adopted computer control.Suitable for blow molding of plastics included polyethylene, PVC, polypropylene, polyester and so on.Hollow container had been produced are widely used in industrial packaging container.According to the parison producing method, blow molding can be divided into the extrusion molding and injection molding,also includes multilayer blow molding and stretch blow molding which are new development.