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Injection Molding

Injection molding is a processing technique for thermoplastics, also known as plastics. Plastic injection molding is an extremely suitable production method for producing larger numbers of plastic products.

Injection molding is very similar to high pressure die casting and is suitable for large production series. The difference is the choice in material, specifically plastic instead of aluminium. A mold often consists out of several cavities, causing the production speed to be very high. Injection molding is particularly suitable for thermoplastic materials such as PLA, ABS, POM, PE and PP. Residual materials can often be recycled for new production.

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Advantages

  • Perfectly suited for thermoplastic plastics.
  • Very high production speed for large production series.
  • High shape complexity possible.

Consequences

  • Limited choice in thermosetting plastics, wherein production costs are often higher.

In injection molding, molten plastic is injected under high pressure into an aluminum or steel mold. The plastic workpiece solidifies under pressure and is then ejected from the mold. The process is very similar to and is also called the equivalent of aluminum high pressure die casting. The process lends itself to high form complexity, allowing for threads, inserts and undercuts. However, this requires the use of several moving parts in the die, which leads to higher die costs.

The most commonly used injection molding machine is the reciprocating screw machine, where plastic raw material (granules) are rotated through a heating element with a screw spindle. The plastic reaches a liquid state and is injected into the mold with the screw spindle. Often multiple cavities are used in a mold to increase production speed. The production rate can be very high and therefore plastic injection molding is also suitable for large series.

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