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Blowing Mould Plastic Processing Methods
Sep 06, 2017

Blow molding, here mainly refers to the hollow blow molding (also known as blow molding) is by means of gas pressure to close the mold in the hot melt billet inflated hollow products, is the third most commonly used plastic processing methods , But also the development of a faster plastic molding method. Blowing mold only mold (die), compared with the injection molding, equipment, low cost, strong adaptability, good molding performance (such as low stress), can form a complex ups and downs (shape) of the products The

Blow mold design process is as follows:

First, the design basis

Dimensional accuracy and its associated dimensions. In the case of

According to the plastic products on the entire product on the specific and function to determine the outside quality and specific size which is:

The appearance of high quality requirements, the size of the lower requirements of plastic products, such as toys;

Functional plastic products, the size of strict requirements;

Appearance and size are required very strict plastic products, such as cameras. In the case of

Is the stripping slope reasonable? In the case of

Stripping slope is directly related to the release of plastic products and quality, that is related to the injection process, the injection can be carried out smoothly:

The release angle is sufficient;

The slope should be with the plastic products in the molding of the sub-mold or sub-mold surface to adapt; whether it will affect the appearance and thickness of the thickness of the accuracy;

Whether it will affect the strength of a plastic product parts. In the case of

Second, the design process

Analysis and digestion of plastic products and entities (samples):

A, the geometry of the product;

B, dimensions, tolerances and design basis;

C, technical requirements;

D, plastic name, grade

E, surface requirements

Third, the classification of the surface to determine

Does not affect appearance;

Is conducive to ensuring product accuracy, mold processing, especially the cavity of the processing;

Is conducive to pouring system, exhaust system, cooling system design;

Is conducive to mold (mold, stripping) to ensure that the mold, so that products remain on the side of the dynamic mode;

Facilitate the arrangement of metal blocks. In the case of

Fourth, the design of the pouring system

The design of the pouring system includes the selection of the main channel, the shape of the cross-section and the size of the shunt, the choice of the position of the gate, the gate form and the gate section size. When the point gate is used, Should pay attention to the design of the gating device, the pouring device nine gate gate institutions. In the case of

In the design of the pouring system, the first is to select the location of the gate. The choice of gate position is directly related to the quality of the product and the smooth progress of the injection process. The choice of gate position should follow the following principles:

① gate position should be selected in the sub-surface, in order to facilitate the mold processing and use when the gate cleaning;

② the location of the gate from the cavity of the various parts of the distance should be consistent, and make the process with the shortest;

③ the location of the gate should ensure that the plastic into the cavity, the cavity in the wide, thick wall parts, in order to facilitate the smooth flow of plastic;

④ gate position should be set in the plastic parts of the thickest section;

⑤ to avoid the plastic flow in the cavity when the straight through the cavity wall, core or insert, so that plastic can flow into the cavity as soon as possible, and to avoid deformation of the core or insert;

⑥ try to avoid the product to produce weld marks, or make it weld marks in the product is not important parts;

⑦ gate position and its plastic inflow direction, should make the plastic into the cavity, can be parallel along the direction of the cavity into the uniform flow, and is conducive to the cavity of the gas discharge;

⑧ gates should be set in the products on the most easy to remove the site, as far as possible without affecting the product appearance. In the case of

Fifth, the exhaust system design

The exhaust system plays a vital role in ensuring the quality of the finished product. In the case of

A, the use of exhaust slot, the exhaust slot is generally located in the cavity is finally filled with the site, the depth of the exhaust groove varies with the plastic, basically the plastic does not produce the maximum allowable gap to determine the flash, Such as ABS0.04 to mud 0.02mm below the race steel 0.02 below. In the case of

B, the use of core insert fader and other with the gap or special exhaust plug exhaust;

C, sometimes in order to prevent the product in the top of the vacuum caused by deformation, will set gas sales;

D, and sometimes in order to prevent the product and mold a vacuum adsorption, and design anti-vacuum adsorption components. In the case of

Six, the design of the cooling system

The design of the cooling system is a relatively rigid operation, that is, to consider the cooling effect and cooling uniformity, but also consider the cooling system on the overall structure of the impact of the mold. In the case of

The arrangement of the cooling system and the specific form of the cooling system; the specific location and size of the cooling system; the cooling of the key parts such as the moving mold or inserts; the cooling of the side and side cores; the design and cooling of the cooling element Component selection; seal structure design.