熱門關鍵詞：濟南彩鋼板 | 濟南復合板 | 濟南彩鋼瓦 | 濟南c型鋼 | 濟南鋼結構 |
There is a certain process when the color steel composite plate is formed, so it is necessary to understand the skin formation principle of the product, so as to facilitate the use in the preparation.
The outer skin and core layer of the whole skin color steel composite plate are made at the same time in one molding process, that is, the skin and core layer are made of the same material. The formation of product skin is mainly caused by the interaction of mold temperature and pressure in mold cavity.
The polyol A and isocyanate B are mixed in proportion and then put into the mould for chemical reaction. The heat released by the reaction makes the foaming agent in the mixture vaporize, so there are liquid and gas phases in the whole reaction system.
Thermodynamic studies show that the formation of skin is mainly affected by mold temperature and molding pressure, which can lead to the dynamic equilibrium of liquid and gas in the reaction mixture. In the reaction system, the temperature close to the mold surface is low, which makes this equilibrium conducive to the production of liquid | while the temperature in the center of the mold is mostly higher than 100 ℃, which is conducive to the formation of gas state.
The material close to the surface of the mould is absorbed by the mould due to the heat. At the same time, due to the pressure generated by the foaming, the gasifier (foaming agent) dissolves in Pu, and the bubbles formed break. The high-temperature core material is pressed into a strong skin on the surface of the mold until the heat released and absorbed is balanced.