What Temperature is Required for Plastic in Injection Molding?

19-11-2024

The temperature required for plastic in injection molding is a complex issue influenced by several factors, and there's no fixed value.

Key factors affecting plastic temperature include:

Type of plastic: Different plastics have different melting points and processing temperature ranges. For example, polyethylene generally requires a lower processing temperature than polystyrene.

Part wall thickness: Thicker parts require higher melt temperatures to ensure the melt can fully fill the mold.

Mold temperature: Mold temperature affects the cooling rate of the melt, which in turn influences the crystallinity and mechanical properties of the part.

The screw speed of the injection molding machine: Higher screw speeds generate more shear heat, which increases the melt temperature.

Part complexity: More complex parts have greater flow resistance, requiring higher melt temperatures.

Generally, the processing temperature range for plastics in injection molding is between 150°C and 350°C. The specific temperature needs to be determined based on the type of plastic, part design requirements, and the performance of the injection molding machine.

Methods to determine the plastic temperature:

Consult the datasheet: The property table provided by the plastic supplier usually gives the processing temperature range of the plastic.

Conduct trial molding: By conducting multiple trial moldings and observing the quality of the parts, gradually adjust the plastic temperature to find the optimal processing parameters.

Refer to experience: Experienced injection molding engineers can select the appropriate plastic temperature based on their experience.


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