In order to avoid as much as possible the self-adhesive label printing failure caused by the quality problems of the self-adhesive material itself, before printing and processing, the appearance quality must be carefully checked first, so that the defects that may cause printing and processing quality problems can be found in time before printing.

1. Check whether there are cracks on the self-adhesive material

When the self-adhesive material is scuttled, if the scuttling tool is not adjusted properly or the blade is not sharp enough, there will be cracks on the face paper or the back paper of the self-adhesive material, and the fibers pulled out at the crack will be stuck by the adhesive. The occurrence of cracks may be continuous, may be random, may appear on one side of the roll self-adhesive material, may also be on both sides. Therefore, before printing the self-adhesive material on the machine, it is necessary to carefully check whether there are small cracks on the bottom paper and the face paper.

Then, take a sample paper that has been checked above, peel the bottom paper and check again whether there are cracks on the bottom paper and the bottom paper, because the cracks are sometimes very small and can only be found after separating the bottom paper and the face paper. It is worth noting that because the ink and adhesive will gradually accumulate on the paper guide roller of the printing press during the printing process, it will also cause cracks on the edge of the self-adhesive material. Therefore, even if printing has begun, the above problems cannot be ignored.

2.check whether the edge of the self-adhesive material is adhered to, whether the backing paper is missing silicone oil or too much silicone

The edge of the self-adhesive material sticks or some areas on the backing paper leak silicone oil, which will cause the face paper to break during the waste discharge during the printing process and can not be produced normally. Therefore, before printing, we must first take a section of self-adhesive material about 1-2 meters long, peel it off by hand, and see if the edge or other parts can not be smoothly peeled. Usually, the edge adhesion of the face paper and the bottom paper occurs on a slitting roll of the whole roll coated self-adhesive material, and generally only occurs at the outer layer of 7 meters to 10 meters, so when there is adhesion on the edge of the slitting roll self-adhesive material, do not immediately assert that the whole roll of paper has this problem.

In addition, it should be noted that the force used to peel off lightweight face paper (such as 60g/m2 and 80g/m2 face paper) is larger than that used to peel quantitative heavy face paper, and the lighter the face paper, the tighter the feel when peeling. Because of this, sometimes according to the shape of the customer's requirements, the die-cutting of the self-adhesive material selected by the customer can not be completed at the conventional printing speed.

3. Check whether the slitting end face of the drum self-adhesive material is flat and straight, and whether the rewinding tightness is consistent

If the slitting end face of the drum self-adhesive material is uneven, it will not only affect the registration during printing, but also cause difficulties in waste discharge due to the change of the cutting position. When rewinding the tightness is not consistent, it will cause changes in the paper tension during printing, and the uneven tension will also cause printing quality problems.