In the HDPE extrusion processing production line, a melt gear pump is typically installed between the screen changer and the die head for metering, pressure boosting, and pressure stabilization. When using a gear pump, a heating source must be provided on the pump body to raise its temperature from room temperature to the range of 180°C to 230°C. The pump can only be started after the material is melted. Once the power is turned on, the gear shaft rotates, and the material begins to be pumped. As the gear shaft rotates, the material inside the pump casing is squeezed and sheared by the gears. During this shearing process, the material itself releases a significant amount of shear heat. The generation of shear heat disrupts the thermal balance of the pump body, causing it to rapidly heat up within a short period, exceeding the process temperature of the material and affecting its quality. Additionally, the amount of shear heat varies with the rotational speed of the gear pump, a characteristic that further increases the difficulty of temperature control. Therefore, melt gear pumps for HDPE materials need to fulfill the following functions: they must be able to both heat up and intelligently cool down.
Specialized melt gear pumps for HDPE materials cool the driving and driven shafts through a rotating joint with cooling water. Simultaneously, the cooling water flows through the gland into the pump casing to cool it down, which in turn cools the material. The pump casing can also be heated using electric heating rods. The electric heating rods and cooling water are controlled by a PID system, enabling intelligent temperature control. This replaces the traditional mold temperature control scheme, reducing maintenance and operating costs and minimizing safety risks during operation. Moreover, intelligent temperature control improves product quality. Zhengzhou BATTE provides melt pumps with capacities ranging from 0.1CC to 12000CC.
Email: info@battemachinery.com
WhatsApp: +86 158 38331071
