Plastic extrusion type physical low-foaming molding method

Abstract

The invention provides a plastic extrusion type physical low-foaming molding method. The plastic extrusion type physical low-foaming molding method is characterized by comprising the following steps: taking expandable polyethylene as a main raw material and mixing the main raw material with an auxiliary material; then adding a mixture into an extruder hopper and uniformly fusing and plastifying resin by an extrusion screw rod; meanwhile, injecting a foaming agent into the fused rein under a condition of high pressure; uniformly mixing the foaming agent with the resin and cooling; extruding and foaming by using a die head; forcedly cooling the outer surface of a sheet material by a die head air ring; sizing by a sizing sleeve and cooling the inner surface of the sheet material by cold water; blowing cold air onto the outer surface of the sizing sleeve to cool the outer surface of the sheet material; planing the cooled sheet material by a cutter into finished sheet materials and winding. The plastic extrusion type physical low-foaming molding method has the beneficial effects that a produced foaming body is relatively strong in compressive capacity, has good size stability, surface flatness and vibration absorption performance, is low in cost, has the environment-friendly effect, is flat, and can be applied to the fields of various electric appliances, electronics, precise instruments, car decorations and indoor furniture.

Description

technical field [0001] The invention belongs to the technical field of plastic machinery, and more specifically relates to a plastic extrusion physical low-foaming molding method. Background technique [0002] At present, some domestic and foreign companies use azodicarbonamide as a foaming agent for chemical filling and foaming. The foaming agent in this low-foaming body cannot be completely decomposed, and it still has certain toxicity, and the cost is relatively high. High, there are still many companies that produce pearl cotton with high physical foaming. When reducing the amount of foaming agent to produce low-foaming products, due to less foaming agent, less heat is taken away, the sheet temperature is particularly high, and the cells shrink , it is impossible to maintain normal production, the compressive performance of the foam is poor, and the dimensional stability, surface smoothness and shock absorption performance are all poor. Contents of the invention [0...

AI Technical Summary

Problems solved by technology

[0002] At present, some domestic and foreign companies use azodicarbonamide as a foaming agent for chemical filling and foaming. The foaming agent in this low-foaming body cannot be completely decomposed, and it still has certain toxicity, and the cost is relatively high. High, there are still many companies that produce pearl cotton with high physical foaming. When reducing the amount of foaming agent to produce low-foaming products, due to less foaming agent, less heat is taken away, the sheet temperature is particularly high, and the cells shrink , it is impossible to maintain normal production, the compressive performance of the foam is poor, and the dimensional stability, surface smoothness and shock absorption performance are poor