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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.
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.
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.
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.
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.