Due to the special structure of primary colored kraft paper, its strong and predictable fiber characteristics, so it has a good machining performance such as embossing, die-cutting and die-cutting. But for the high strength toughness of the primary color fiber, it is required that the kraft paper through deep indentation line to avoid rebound. In addition, die-cutting knife must be sharp. Due to the high strength of the kraft fiber, a narrow indentation is required on the perforation line
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