Production process of EPP (Expanded Polypropylene) foam plastics

Abstract

The invention discloses a production process of EPP (Expanded Polypropylene) foam plastics. The production process comprises the following steps: 1) initial expansion: heating raw materials of EPP foam plastics with water vapor to achieve the effect of initial expansion, wherein the heating temperature is 65 DEG C, and heating time is 25 minutes; 2) pressing: a) pre-pressing: applying a pressure of 0.7kg to the initially-expanded EPP foam plastics, wherein pressing time is 25 minutes; b) first pressurization: after the pre-pressing is finished, applying a pressure of 3kg to the EPP foam plastics, wherein the pressing time is 500 minutes. Compared with other production processes, the production process disclosed by the invention has the advantages of low technology price and mature process.The EPP foam plastics are pressurized and deflated twice in the pressing process, thereby making the foam plastics firmer, harder and better in quality. Moreover, no flipping occurs after two times of pressure relief, so that the pressure-applied foam plastics is reversed, and each side is pressed evenly, thereby improving the pressurization effect, reducing internal bubbles and uneven hardness,and meeting the needs of customers.

Description

technical field [0001] The present invention relates to the production technology of EPP foam plastic, more specifically, relates to a kind of production technology of EPP foam plastic. Background technique [0002] With the rapid development of the economy, the continuous improvement of people's living standards, and the rapid development of the automobile industry, people's requirements for the internal components of automobiles are also getting higher and higher. [0003] However, the production process of most warp-knitted EPP foam plastics on the market is relatively simple. When pressing the expanded foam plastic in the production process steps, only one side is pressed, which will make the upper and lower pressing densities uneven, making the Partial air bubbles appear inside the product, the hardness of the product after molding is low, and the quality cannot meet the requirements, and the cooling step in the final molding is simple and direct, which will easily caus...

AI Technical Summary

Problems solved by technology

[0003] However, the production process of most warp-knitted EPP foam plastics on the market is relatively simple. When pressing the expanded foam plastic in the production process steps, only one side is pressed, which will make the upper and lower pressing densities uneven, making the Partial air bubbles appear inside the produc