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.

整皮彩鋼復合板的外皮與芯層在一次成型過程中同時制得，也就是表皮與芯層都由相同的材料制成。產品表皮的形成，主要是受到模具溫度和模腔內壓力相互作用的結果。

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組分及異氰酸B組分按配比充分混合后進人模具進行化學反應，反應放出的熱量使混合物中的發泡劑氣化，這樣在整個反應體系中存在著液相和氣相。

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.

熱力學研究表明，表皮的形成主要受模具溫度和模塑壓力影響，壓力和溫度能導致正在反應的混合物中液體和氣體的動態平衡。反應體系中靠近模具表面溫度低，使得這種平衡有利于產生液態|而在模具的部位溫度大多高于100℃，有利于形成氣態。

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.

彩鋼復合板靠近模具表面的物料，由于熱量被模具吸收一部分，同時由于發泡產生的壓力，而使氣化物（發泡劑）溶于PU中，形成的氣泡發生破裂，高溫的芯層物料在模具的表面被壓制成結實的表皮，直至放出和吸收的熱量平衡為止。

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.