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.

整皮彩钢复合板的外皮与芯层在一次成型过程中同时制得，也就是表皮与芯层都由相同的材料制成。产品表皮的形成，主要是受到模具温度和模腔内压力相互作用的结果。

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.

多元醇A组分及异氰酸B组分按配比充分混合后进人模具进行化学反应，反应放出的热量使混合物中的发泡剂气化，这样在整个反应体系中存在着液相和气相。

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.

热力学研究表明，表皮的形成主要受模具温度和模塑压力影响，压力和温度能导致正在反应的混合物中液体和气体的动态平衡。反应体系中靠近模具表面温度低，使得这种平衡有利于产生液态|而在模具的部位温度大多高于100℃，有利于形成气态。

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.

彩钢复合板靠近模具表面的物料，由于热量被模具吸收一部分，同时由于发泡产生的压力，而使气化物（发泡剂）溶于PU中，形成的气泡发生破裂，高温的芯层物料在模具的表面被压制成结实的表皮，直放出和吸收的热量平衡为止。

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.