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What is the coffee Bottom sealing bag?

What is the coffee Bottom sealing bag?
Coffee Bottom sealing bag is on the back of the seal, the front size of the finished product size, the back is divided into equal parts, and its width is equal to the sum of the width of the front, is on the back, when the design is usually will unfold, carries on the integration of design, and add 1 cm around each sealing side, is, back at the same registering the roller.
Solid seal is at the end of the seal, on the basis of the stereotactic edge on both sides, back, side 3 surface also are in the same registering the roller.

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