PE Pipe Extrusion Equipment；PE Pipe Production Line； PE Pipe Production machine; Single Screw Extruder; Manufacturers

You may not know it very well. Generally speaking, in the production process of plastic products, a common equipment is the plastic extruder. There are many kinds of plastics that can be produced by the plastic extruder. However, when we select the plastic extruder for production, we need to select the plastic extruder equipment according to the material of the specifically produced plastics.

Plastic extrusion has always been an important link in the production process of insulation pipe equipment, which is not only related to speed but also to quality, and the extruder plays a decisive role in this link. Ningbo Fangli Technology Co., Ltd. has summarized a series of experience from theory to practice on how to deal with problems in these links, from feeding to screw heating, from 6-stage advancing plasticization to head cooling water. Today, I will focus on the following points, hoping to attract the attention of customers who use vacuum sizing insulation pipe equipment, so as to better improve the production efficiency of insulation pipe equipment and reduce production costs.

In most extruders, the screw speed is changed by adjusting the motor speed. The drive motor usually rotates at a full speed of about 1750rpm, which is too fast for an extrusion screw. If it rotates at such a fast speed, too much friction heat will be generated, and the uniform and well stirred melt cannot be prepared due to the short residence time of the plastic. The typical reduction ratio should be between 10:1 and 20:1. In the first stage, gear or pulley block can be used, but in the second stage, gear shall be used as much as possible and the screw shall be positioned at the center of the last big gear. For some slow-moving machines (such as twin-screw for UPVC), there may be three deceleration stages, and the greater speed may be as low as 30rpm or less (ratio up to 60:1). On the other hand, some very long twin screws for stirring can run at 600rpm or faster, so a very low deceleration rate and more deep cooling are required.

Screw refers to the metal rod with screw groove that can rotate in the barrel of extruder or injection molding machine. Screw is the most important part of extruder to transport solid plastic, plasticized plastic and melt, which is often called the heart of extruder. Through the rotation of the screw, the plastic in the barrel can move and get pressurized and friction heat. The geometric parameters of the screw have a great relationship with the characteristics of the extrusion machine. Whether the screw design is reasonable or not directly affects the working performance of the extrusion machine.

Twin screw extruder has the characteristics of forced conveying, short residence time, good exhaust performance, uniform mixing and low power. Twin screw extruder is mainly composed of two mutually meshing screws rotating in the barrel, forcing the material to shear and move forward.