How To Control The Temperature In The Production Of PVC Sheet Foam?

1. Raw material mixing stage:

· Control the mixing temperature: ensure that the material reaches the appropriate temperature during the mixing process, usually around 110℃, to promote the uniform mixing of the material and the full dispersion of the additives.

2. Extrusion molding stage:

· Set reasonable temperature: according to the formula and extruder characteristics

Set the temperature of each heating zone. Barrel temperature is generally

Between 160℃-190℃, the head temperature is between 170℃-200℃, and the mouth mold temperature is between 180℃-210℃.

· Real-time monitoring and adjustment: Use high-precision temperature sensors to monitor the temperature of each heating zone in real time, and adjust it according to the actual situation to ensure that the temperature fluctuation is within 2 ℃.

Control screw speed: screw speed affects the shear heat and residence time of the material in the extruder, which in turn affects the temperature. Should be based on the material plasticization situation and product quality

To adjust the screw speed to avoid high temperature due to high speed.

3. Cooling and setting stage:

· Control the cooling water temperature: the cooling water temperature should be appropriate, generally between 15 ° C and 25 ° C, to ensure that the sheet is fully cooled and maintains good surface quality and dimensional stability.

· Adjust the cooling speed: according to the thickness and foaming of the sheet, adjust the cooling speed to avoid excessive internal stress caused by too fast cooling, or deformation caused by too slow cooling.

4. Other precautions

· Regular maintenance of equipment: regular maintenance and maintenance of extruder, mold and other equipment to ensure the normal operation of heating and cooling system, accurate and reliable temperature control.

· Optimize the formula: select the appropriate stabilizer, lubricant and other additives, optimize the formula, improve the thermal stability of the material and reduce the impact of temperature fluctuations on product quality.

Through the above measures, the temperature in the production process of PVC sheath foam board can be effectively controlled, to ensure stable product quality and improve production efficiency.