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What is the block bottom three-side-seal bags?

What is the block bottom three-side-seal bags?

The block bottom three-side-seal bags is around the bag sealing, positive and back size are finished size, has a certain integral feeling, design constraints, and before and after the design has a certain continuity.Due to the positive and the back size is consistent, can design a positive first, let the back and front echo.Plate is, back to arrange in the same registering the roller.

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