Introduction to Plastic Mold
Posted: 03/30/2017 11:54:59  Hits: 17
Mold is closely related to a variety of tools and products in our daily production and daily life, from machine base, machine housing to minutia screw, buttons, and to household appliance shells. The shape of the mold determines the shape of these products, processing quality and accuracy of mold decide the quality of the products. Due to different material, appearance, specification and application, we can classify mold into casting mold, forging mold, die casting mold, non-plastic mold like stamping mold and plastic mold. 

In recent years, with rapid development of plastics industry and continuous improvement of strength and accuracy of engineering plastics, scope of plastic products application expanded gradually. For example, the proportion of plastic products is rapidly increasing in many fields of household appliances, instrumentation, construction equipment, automotive, daily used hardware. A reasonably designed plastic part can often replace a number of traditional metal parts. The plastic tendency of industry products and daily products has increasing.

The general definition of mold:
With a variety of presses and special tools installed in the press, we use metal or non-metallic materials to produce the desired shape of parts or products by pressure in industrial production. This kind of special tool is referred as mold.

Injection process
Mold is a tool for producing plastic products. It consists of several parts, which includes molding cavity. 
In the process of injection molding, the mold is clamped on injection molding machine, molten plastic is injected into molding cavity and then cooled. The upper mold and bottom mold would be separated, products are ejected from the mold cavity through ejector system. Then the mold would close for next injection molding process, which is a circulation.

(1) General classification of mold:
Mold can be classified into plastic mold and non-plastic mold:
(1) non-plastic molds are: casting mold, forging mold, stamping mold, die casting mold.
A. Casting mold-faucet, pig iron platform
B. Forging mold-car body
C. Stamping mold-computer board
D. Die casting mold-super alloy, cylinder block

(2) plastic mold are classified into the following types according to its production processes and different products
A. Injection Molding-TV Enclosure, Keyboard Button (widely used)
B. Blow molding-beverage bottle
C. Compression molding-bakelite switch, scientific porcelain bowl
D. Transfer Molding-Integrated Circuit Products
A Extrusion molding-glue pipe, plastic bag
F. Heat Molding-Transparent Molding Package
G. Rotary Molding Molding-Soft Leather Doll Toy

Injection molding is the most common method of plastic processing. This method is suitable for all thermoplastics and partially thermosetting plastics. Its great amount of plastic products is unreachable for other methods. As one of the main tools for injection molding, its production efficiency which includes quality precision, manufacturing cycle and injection molding process has an direct impact on product quality, production, cost and product updates, and determines reaction capacity and speed of owners in the competitive market.
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