Electronic – Copper layer delaminates on Printed Circuit Board

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I have been making the PCB boards by the conventional process since last few years (pressing, etching, drilling, soldering).

I usually iron the photo paper to the PCB board for around 15-20 minutes but this time something unusual happened and the PCB board had this shape. The copper rose from the board while I was pressing and left it in this shape:

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This is my first encounter, can anyone suggest why this happened? I pressed for only 6 minutes.

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Best Answer

You are most likely using low quality laminate and too high transfer temp. As you see the paper has turned brown which is a sign of you temps being too hot. I make my PCBs by heating them for 5min on cotton setting of the iron. Try cutting the board and transferring each one independently, not all at once, helps with etching too. Apart from that I can see that you have very good transfer paper, the traces look great!