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Do you know the six categories of plastic mold(2)

Update:09-04-2020
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3. Plastic compression mould Including compression mold […]

3. Plastic compression mould
Including compression molding and injection molding two structural mold types. They are a type of mold mainly used for molding thermosetting plastics, and the corresponding equipment is a pressure molding machine. According to the characteristics of plastics, the compression molding method heats the mold to the molding temperature (usually at 103 ° 108 °), and then puts the measured compression molding powder into the mold cavity and the charging chamber, and closes the mold. The plastic appears under high heat and high pressure Softens the viscous flow, solidifies and sets after a certain period of time, and becomes the desired product shape. The difference between compression injection molding and compression molding is that there is no separate feeding chamber. The mold is closed before molding. The plastic is preheated in the feeding chamber in a viscous state. Under pressure, it is adjusted into the mold cavity and hardened. Compression molds are also used to mold some special thermoplastics such as difficult-to-melt thermoplastics (such as polyvinyl fluoride) blanks (cold compression molding), resin lenses with high optical performance, slightly foamed nitrocellulose automobile steering wheels, etc. . Compression mold is mainly composed of cavity, feeding cavity, guide mechanism, ejecting parts, heating system and so on. Pressure injection molds are widely used to encapsulate electrical components. The materials used in the manufacture of compression molds are basically the same as injection molds.
4. High-foam polystyrene mould
Is a mold that uses expandable polystyrene (beads composed of polystyrene and foaming agent) to form foam packaging materials of various shapes. The principle is that expandable polystyrene can be steam-formed in the mold, including two types of simple manual operation mold and hydraulic straight-through foam plastic mold, which are mainly used to produce packaging products for industrial products. The materials for manufacturing such molds are cast aluminum, stainless steel, bronze and so on.

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