Wuhan Handern Hollow Blow Molding Process
DATE：2020/11/26 9:05:42 / READ： / SOURCE：This station
Wuhan Handern Hollow Blow Molding Process
1. Special blow molding process
Generally refers to blow molding of sandwich plastic products or a blow molding process with complex structure and special parting surface. Now introduce a body cover connected to
The production process of the sandwich toolbox together. The opening hinge is formed by the pressing surface of the mold itself. The toolbox is divided into two parts, a male mold and a female mold, and a vacuum device is provided in the female mold part. In order to obtain products with uniform wall thickness, pre-blowing method is adopted. Because the bag-shaped parison has been filled with a certain amount of air and the vacuum suction effect of the male mold cavity, the parison can be uniformly attached to the surface of the male mold and the female mold without adhesion. When the mold is closed, the needle-shaped blow rod pierces the parison and blows in compressed air to further shape the product, thereby obtaining an ideal product. www.handern.net Hollow Profile Sheet Machinery
Two, two-way stretch blow molding process
Aiming at the disadvantages of poor wall thickness uniformity, irregular bottle mouth and high consumption of raw materials in the extrusion-blow molding process, the extrusion-stretch blow molding process, injection-blow molding process and injection-stretch blow molding process have been developed . The common feature is that the polymer is biaxially stretched and blow-molded at a specific temperature to improve its performance.
The two-way stretch blow molding process has the following advantages: ①Improves the tensile strength, impact strength, stiffness and pressure ability of the product ②It can reduce the wall thickness, reduce the weight, and save raw materials under the same use requirements; ③It can improve the transparency and Luster, the product is more beautiful, ④The wall thickness of the product is uniform, the dimensional accuracy is good, and the heat distortion temperature is also increased. www.handern.com HollowProfile SheetMachinery
The basic principle of two-way stretch blow molding is to cool the extruded or injection molded blank to a specific temperature in a thermoelastic state, and then stretch and blow it so that the macromolecular chains are aligned in two directions. The degree of orientation of macromolecules depends on the stretching ratio, which is closely related to the performance of the product. Generally, the larger the stretching ratio, the better the performance, but considering the comprehensive conditions such as production cycle and use requirements, the maximum value cannot be taken. www.handern.com HollowProfile Sheet Machinery
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