Molding plastic requires careful temperature control, depending on the type of plastic and the specific molding process.
5 Key Factors to Consider
1. Temperature Range for Crystalline Materials
For crystalline materials, the molding temperature should not exceed 475 degrees Celsius.
The optimal molding temperature for these materials is between 350-400 degrees Celsius.
Exceeding 475 degrees can lead to discoloration or the formation of bubbles in the plastic.
2. Moisture Absorption and Processing Methods
Crystalline plastic materials have low moisture absorption and can be processed using typical thermoplastic methods.
However, these materials have poor fluidity and are prone to decomposition, releasing corrosive gases.
Maintaining the correct temperature is crucial to prevent degradation and ensure the quality of the molded product.
3. Mold Temperature
The mold itself should be heated to a temperature between 150-200 degrees Celsius.
This helps in facilitating proper molding and prevents issues related to the material's corrosive properties on the metal mold.
4. Gating System Design
The gating system, which controls the flow of material into the mold, should be designed to have low resistance to material flow.
This is important because the material's poor fluidity can lead to difficulties in filling the mold completely if the gating system is not optimized.
5. Long-Term Production Considerations
For long-term production, the mold needs to be electroplated with chrome due to the corrosive effect of the molten material on metal.
This helps in maintaining the integrity of the mold and ensures consistent product quality over time.
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