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Introduction Of Injection Molding Method For Thermoplastics

2008/8/8 15:42:00 41781

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Thermoplastic injection molding is by melting plastic material and then injecting it into the membrane cavity.

Once molten plastic enters the mold, it is molded into a certain shape by the cold mold cavity.

The shape obtained is often the final product, and no other processing is needed before installation or final use.

Many details, such as raised parts, ribs and threads, can be molded in one step of injection molding.

The injection molding machine has two basic parts: injection device and clamping device for melting and sending plastic into the mold.

The function of the die set is as follows: 1., the mold is closed under the pressure of injection; 2., the product is taken out and the injection device is melted before the plastic is injected into the mold, and after {HotTag}, the melt is injected into the mold by controlling the pressure and speed.

At present, there are two kinds of injection devices: screw type pre plasticizing device or two-stage device, and reciprocating screw.

The screw preplasticizing device uses the pre plasticized screw (first stage) and then injecting molten plastic into the injection rod (level second).

The advantages of the screw preplasticizing device are constant quality of the melt, high pressure and high speed, and precise injection control (using mechanical thrust devices at both ends of the piston stroke).

These advantages are needed for pparent, thin-walled products and high production rates.

Its shortcomings include uneven residence time (resulting in material degradation), higher equipment costs and maintenance costs.

The most common reciprocating screw injection device does not require plungers to melt and injecting plastics.