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Why brock bottom bag need to make double copper palte?

Why brock bottom bag need to make double copper palte?

1.Brock bottom bag have side gusset and bottom gusset. About printing, there are print front, back and bottom gusset firstly, and then print side gusset. They couldn’t print together.

2.As for cutting, that will make two part to seal and then cut.

So all factory need to make double copper plate to make brock bottom bag.

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