Experience in PC extrusion production

Precautions:

1. When the injection pressure is high, the temperature in the tube is too high or the residence time is long, it is easy to cause thermal decomposition, discoloration and lower physical properties. It should be noted that the mold temperature is 85°C~120°C. (1) Control the moisture below 0.02%; (2) Dry at 120°C for 4 hours, and do not exceed 150°C.

2. It is especially difficult to form thick finished products, because the finished products are prone to residual stress, which will cause cracks in the future, so it is better to use powdered silicone as the release agent instead of liquid release agent.

3. Forming requires high temperature and high pressure, and a screw type forming shuttle must be used.

4. The material should be fully dried before use.

5. The gate and runner design should have a small flow resistance.

6. The molded product should be designed with a close-to-the-wall thickness, and metal parts should be avoided. Furthermore, the retraction slope must be above 2°.

7. Molding shrinkage rate 0.4%~0.7%, specific gravity 1.2~1.5.

8. Heating temperature 230~310℃, mold temperature 80120℃, material tube temperature 260~310℃, ejection material temperature 280~320℃, injection pressure 800~1500kg/cm2, minimum operation Temperature 260°C.

9. Use a dehumidifying dryer, the drying temperature is 105~120°C (below 0.02~0.03%), it takes 24 hours, the first section of the material pipe temperature is 260~270°C; the second section is 260~270°C; the third section The first stage is 240~250°C; the fourth stage is 220~230°C; the mold surface temperature is 40~60°C. Temperature setting: nozzle 230~300℃, front section 260~280℃, middle section 265~275℃, rear section 250~270℃; screw speed 40~160rpm, mold temperature 80^120℃, injection pressure 1000~1400kg/cm2 , Back pressure 5-15kg, screw compression ratio 2.4, L/D 15~24.

JE is a professional PC extrusion manufacturer in China,

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