Processing techniques of UHMWPE sheet for ultra-high molecular weight polyethylene sheet

Processing technology of ultra-high molecular weight polyethylene sheet UHMWPE sheet：

Compression molding process：

Compression molding is the earliest processing method for UHMWPE, and the process flow is shown in Figure 12. The method is not affected by the molecular weight and fluidity of the resin raw materials, and the produced products have small internal stress and warpage deformation, simple equipment, low production cost, and low production efficiency.

In addition to the traditional molding process, the preparation methods of the sheet include: ① extrusion molding. Use plunger extruder for reciprocating batch extrusion or screw extruder for continuous extrusion; ② Gas-assisted extrusion. During the screw extrusion process, a stable gas is injected between the die and the melt material to provide the boundary condition of full wall slippage and reduce the frictional resistance between the melt and the flow channel; ③Ultrasonic powder molding method. Use ultrasonic vibration to rapidly heat and plasticize the powder itself and then press molding; ④ high-speed impact molding. At the temperature near the melting point, the mold filled with powder is subjected to high-speed impact and then sintered.