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  • pcb麦拉膜怎么贴在板面上?

    本站编辑:杭州临安金盛泰箔带有限公司发布日期:2022-05-13 15:09 浏览次数:

    要光面向下,这是因为在做曝光的时候,光的一面向下是用来透光的,光面能使光更加均匀的透过紫外线光,使曝光质量更高;

    而粗面要紧贴PCB线路板,为了更好的贴紧麦拉膜,要使用抽气抽真空,如果这面也是光面的话,就会使麦拉膜与PCB之间形成气泡,影响曝光效果。

    而粗面的作用正是使麦拉膜和PCB之间形成一定的空隙,这样在抽气的时候就能把空气抽干净。

    麦拉具有尺寸稳定、平直和优良的抗撕拉强度,耐热耐寒、耐潮耐水、耐化学腐蚀,并具有超强的绝缘性能,优异的电气、力学、耐热、耐化学性能。

    The light surface should be downward, because when making exposure, the downward side of the light is used to transmit light. The light surface can make the light pass through the ultraviolet light more evenly and improve the exposure quality;

    The rough surface should be close to the PCB circuit board. In order to better adhere to the Mylar film, air extraction and vacuum should be used. If this surface is also smooth, bubbles will be formed between the Mylar film and PCB, affecting the exposure effect.

    The function of rough surface is to form a certain gap between Mylar film and PCB, so that the air can be pumped clean when pumping.

    Mylar has stable size, straightness and excellent tear strength, heat and cold resistance, moisture and water resistance, chemical corrosion resistance, super insulation performance, excellent electrical, mechanical, heat resistance and chemical resistance.