There is a certain process in the formation of color steel composite plate, 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 the core of the whole skin color steel composite plate are made at the same time in one molding process, that is, the outer skin and the core are made of the same material. The formation of product skin is mainly affected by the interaction of mold temperature and mold cavity pressure.

 

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。

Polyol a component and isocyanate B component are fully mixed according to the proportion before entering the mold for chemical reaction. The heat released by the reaction makes the foaming agent in the mixture gasify, 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 near the surface of the mold is low, which makes the equilibrium conducive to the formation of liquid | and 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 die surface of color steel clad plate is partly absorbed by the die due to heat. At the same time, due to the pressure generated by foaming, the vaporizer (foaming agent) is dissolved in Pu, and the bubble formed is broken. The high temperature core material is pressed into a solid skin on the die surface until the heat released and absorbed is balanced.