Views: 0 Author: Site Editor Publish Time: 2018-02-05 Origin: Site
EVA foaming in general there are three kinds of technologies, the traditional large-scale foaming plate technology, the mold of small foaming technology and injection technology.
1, Injection Technology
This process will slowly become the mainstream, only one process to make the products, easy and concise, but the mold is relatively high precision. Process principle is similar to the plastic injection molding industry, but the injection need to open mold immediately, and the mold temperature is different. EVA injection is to adjust the temperature and mold opening time for the plastic injection. Now most well-known sports shoes are used this method. high efficiency!
2, The traditional large flat foaming technology
Now smaller factories generally use this process, the cost of machinery and equipment is relatively low. This process is mainly used as a plate, and then made by blanking, edging and other processes products. Foaming conditions are relatively fixed, the temperature is at 160 ~ 170, the time is determined by the thickness of the mold, the general 90 ~ 110 seconds / MM, pressure 150KG / square CM.
3, In-mold small foaming technology
This process is mainly used in shoe materials, The first time foaming of sports shoes to do the second middle sole. According to recipe good material granulation, put into a ready mold, then get the general product. The difficulty is the symmetry of the mold and the formula, otherwise it is difficult to control the magnification and hardness. Usually the size is ok but the hardness is not enough,or the hardness is ok but the size is smaller. Foaming conditions is more flexible, depending on the product structure, of course, mainly the impact of time.