Wave of raw material: if the height of the lowest point and the highest point of 100cm horizontal development measurement is more than 5mm, it is judged as defective product. If ≤ 5mm is a good product and the wave of the aluminum foil that can be cut is ≤ 5mm, the electrolytic paper can be drawn into the aluminum foil to pad the gap caused by the wave surface. It is forbidden to use tape and other items.<br>
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