Buffer material for PCB laminating machine

2023-11-02 10:15

The buffer material of the general PCB laminating machine is kraft paper. Special cushioning materials such as: silicone sheet (mainly used for cold plate pressing, its compressibility, equilibrium pressure, temperature performance are better than kraft paper), pacopad sheet (for aluminum plate thickness is larger, the shape of the more complex cold plate pressing, can prevent excessive local overflow glue, its thermal conductivity and compressibility are better than silicone film). The factors and trends that affect the role of cushioning materials (mainly kraft paper) are as follows: Influencing factors Kraft paper quantity Kraft paper usage times Kraft paper thickness/gram weight specifically affects the number of kraft paper is too small, heat, pressure, anti-skid effect is not good. Excessive amount of kraft paper, increased thermal resistance and slow heat transfer rate will affect the heating rate and curing temperature of the laminate. Under high temperature, kraft paper will gradually lose its air permeability, and the effect of heat and pressure is not good. Old and new kraft paper is used in a certain proportion, and should be stopped after 4 times of use. The larger the weight and thickness of kraft paper, the larger the thermal resistance and the slower the heat transfer rate, which will affect the heating rate and curing temperature of the laminate.

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