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Ink reasonable choice
Because kraft paper is different from SBS paperboard and general printing paper, it is uncoated, loose than bleached paperboard, the surface has many pores, strong permeability, etc., which need to be integrated in ink application and coating consider. For example, according to the analysis of the characteristics of kraft paper, the general use of flexographic printing is better, but should not use offset printing machine full version of kraft paper printing. Due to the rough surface of kraft paper, soft texture, strong ink absorption, matte color of printed matter, and printed ink will appear down the paper fiber (also known as pull off the paper) phenomenon.
Cardboard production and processing
As unpolished kraft paper loose porous and larger size, making it easy to produce dust in the cardboard manufacturing process, so pay attention to prevent and reduce the harm caused by dust.
India die-cutting process
Due to the special structure of primary color kraft paper, its strength and predictable fiber characteristics, which have better embossing, die-cutting and molding etc processing performance. But for the high strength and toughness of the primary fibers, kraft paper is required to go through the deep indentation line to avoid the rebound. In addition, cutting knife must be sharp. Due to the high strength of the kraft fiber, a narrow indentation is also required on the perforation line, the nicks required for punching should be less and smaller.
Glue reasonable bonding
High-cure, high viscosity resin adhesive for low temperature bonding, need to be cooled before attached to the kraft paperboard, can not penetrate a large number of cardboard, the traditional hot melt