Influence of humidity on printing kraft paper tape

Printed kraft paper tape can be seen everywhere in our lives. Kraft paper tape is mainly used for packaging boxes, file boxes, product boxes, articles, etc. Kraft paper tape has better physical properties, higher burst resistance, and moisture resistance.

When it comes to the image of the packaging, it is definitely inseparable from the design and printing. Too much sweat on the kraft paper tape during printing will also lead to poor printing results. Since the kraft paper tape is made of plant fibers and fillers, the kraft paper tape is printed In the process, the vertical expansion and contraction amount will be relatively small, while the horizontal expansion and contraction amount will be larger, and the maximum will reach 0.3mm or more, which will seriously affect the quality of printing.

The uneven moisture content of the kraft paper tape will make the overprinting inaccurate. During the storage of a large number of kraft paper tape, only four sides are in contact with the air, and the paper surface has less contact. Therefore, as the surrounding temperature and humidity change, the moisture content of the kraft paper tape is uneven, and the phenomenon of ruffles appears.

If the kraft paper tape has a lotus leaf edge before printing, the graphic imprint on the surface of the kraft paper tape after embossing cannot be consistent with the printing plate, which will cause inaccurate overprinting.

Therefore, we hang the kraft paper tape to dry and adjust the humidity before printing. First, remove the ragged paper and the paper with uneven surface, so that the temperature and humidity of the kraft paper tape are consistent with the temperature and humidity of the offset printing workshop, which can prevent the mental retardation from being upturned and collapsed due to uneven moisture content.

In addition, you can also require the factory to immediately take the tear film to make the outer packaging after each flat sheet of paper is cut. Can effectively play a role in waterproofing, and prevent the phenomenon of lotus leaf due to uneven water content.