The effect of humidity of printed kraft paper gummed tape

Kraft paper gummed tape can be seen everywhere in our lives. Kraft paper gummed tape is mainly used for packaging boxes, document boxes, product boxes, articles, etc. Kraft paper tape has good physical properties, high breaking resistance and moisture resistance.

When it comes to the image of packaging, it is definitely inseparable from design and printing. Too much water in printed kraft paper tape will also lead to poor printing results. Since kraft paper tape is made of plant fibers and fillers, kraft paper tape is used in The amount of expansion and contraction in the printing process will be relatively small, and the amount of expansion and contraction in the horizontal direction will be relatively large, and the maximum can reach more than 0.3mm, which will seriously affect the quality of printing.

If the moisture content of the kraft paper tape is not balanced, the overprinting will be inaccurate. During the storage of a large number of kraft paper tape, only four sides are in contact with the air, and there is less direct contact.

Therefore, as the surrounding environment temperature and humidity changes, the moisture content of the kraft paper tape will be unbalanced, and the phenomenon of lotus leaves will appear. If the kraft paper tape has already become lotus leaves before printing, then the kraft paper will be printed after printing. The graphic imprint on the surface of the tape will not be consistent with the printing plate, resulting in inaccurate registration.

Therefore, we need to hang the kraft paper tape before printing. First of all, it is necessary to remove the torn 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 paper from curling due to uneven moisture content.

In addition, you can also require the factory to take the tear film to make the outer packaging immediately after each flat sheet of paper is cut, which can achieve the effect of waterproofing, and it can also be placed because of the uneven moisture content, which may cause the lotus leaf to appear.