Plastic knowledge polycarbonate PC engineering plastic engineering plastics PC engineering plastic injection molding knowledge injection molding knowledge plastic knowledge - polycarbonate PC engineering plastic injection knowledge polycarbonate PC engineering plastic injection knowledge:
[melt temperature]: 280-310 ° C
[Cylinder constant temperature]: 220 ° C
[Mold temperature]: 80-110 ° C
[Injection pressure]: Because of the poor fluidity of the material, a high injection pressure is required: 130-180 MPa (1300-1800 bar).
[Pressure pressure]: 40%-60% of the injection pressure; the lower the pressure, the lower the product stress.
[Back pressure]: 10-15MPa (100-150bar)
[Injection speed]: It depends on the flow length and section thickness: thin-walled products require rapid injection; if good surface quality is required, multi-stage slow injection is used.
[screw speed]: The maximum line speed is 0.6 m/s; the plasticizing time corresponds to the cooling time; the screw requires a large torque.
[Measuring stroke]: 0.5-3.5D
[Residual material amount]: 2-6mm, depending on the metering stroke and screw diameter.
[Pre-bake]: Dry at 120 ° C for 3 h; keep the moisture below 0.02%, which will make the mechanical properties better.
[Recovery rate]: Up to 20% of the material can be added; the higher return ratio will maintain heat resistance, but the mechanical properties will be reduced.
[Shrinkage]: 0.6%-0.8%, if it is a glass reinforcement type, 0.2%-0.4%
[Gate system]: The gate diameter should be at least equal to 60%-70% of the wall thickness of the product, but the intersection diameter is at least 1.2mm (the intersection slope is 3-5°, or the surface quality product needs 2°) ); for small products with uniform wall thickness, point gates can be used.
[Barrel equipment]: Standard screw, anti-reverse ring, straight-through nozzle.
[Machine shutdown period]: If the production is interrupted, the machine is operated like an extruder until there is no plastic extrusion and the temperature drops to about 200 °C: clean the barrel, use high-viscosity PE, pull the screw out of the hot barrel and use Wire brush to remove the residue.
[Dongguan Xinxin Plastic Materials Co., Ltd.]
[Plastic knowledge polycarbonate PC engineering plastic engineering plastics PC engineering plastic injection molding knowledge injection molding knowledge]
ã€Company philosophy】
[Original channels of supply, ensure sufficient stability! Professional technical support, solve problems for you! Accurate market conditions, provide the best price! Standard operating procedures, issued a concept of 17 VAT long-term cooperation. We will be happy to answer your questions about plastics and products. 】
[Contact: Miss Wu] [Contact Phone] [QQ/WeChat]
[Looking forward to your inquiries, or online consultation. 】
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