EPDM片材挤出机-玖德隆机械(昆山)有限公司

Sheet extruder preheating device
Cable core preheating is necessary for both insulation extrusion and sheath extrusion. For the insulation layer, especially the thin layer insulation, the existence of pores cannot be allowed. The wire core can be completely removed from the water and oil on the surface by high-temperature preheating before extrusion. For sheath extrusion, its main function is to dry the cable core to prevent the possibility of pores in the sheath due to moisture or moisture around the cushion layer. Preheating can also prevent the residual internal pressure caused by the sudden cooling of the plastic during extrusion. During the plastic extrusion process, preheating can eliminate the large temperature difference formed when the cold wire enters the high-temperature machine head and contacts the plastic at the die mouth, avoiding fluctuations in the extrusion pressure caused by fluctuations in plastic temperature, thereby stabilizing the extrusion volume and ensuring Extrusion quality. The extrusion unit uses an electric heating wire core preheating device, which requires sufficient capacity and ensures rapid temperature rise, so that the wire core preheating and cable core drying efficiency are high. The preheating temperature is restricted by the pay-off speed and is generally similar to the temperature of the machine head.