When the injection molding screw has difficulty pressing the material at the feeding port or fails to form sufficient adhesion along the length of the barrel to convey the material, the screw will slip. During the pre-plasticizing stage of the screw, as the screw rotates in the barrel, conveying the material along the screw direction and retreating to accumulate the material for the next injection molding, the screw…

1. Feeding zone: The depth of the fixed screw groove is determined, and its function is to be responsible for preheating, solid plastic conveying and pushing. It is necessary to ensure that the plastic begins to melt at the end of the feeding section – that is, it needs to be preheated to the melting point.

The screw barrel of an injection molding machine operates for a long time under high pressure, high temperature, high mechanical torque and high friction conditions. The first few factors are required by the process conditions, but the wear and tear caused by friction is inevitable. Generally, screws undergo surface nitriding treatment to enhance surface hardness, that is, to improve wear resistance…