Adhesive material appearance check points

In order to avoid label failures caused by the quality of the adhesive material itself as much as possible, before the printing process, it is necessary to carefully check the appearance quality of the self-adhesive material so that it can be timely before printing. Discover defects that may cause print processing quality problems.

1, check whether the adhesive material has flash

The edge of the roll adhesive material is smooth and free of damage, which is the basis for ensuring the quality of label printing. Therefore, before the printing process, we must carefully inspect whether the cutting edges of the reel material are flashed or not. Improper damage occurred, and the roll of adhesive material was rolled 4-5 turns and the edge of the slit was examined carefully.

2, check the adhesive material for cracks

When the self-adhesive material is cut, if the cutting knife is not adjusted properly or the cutting edge is not sharp enough, cracks will appear on the surface of the adhesive material or the bottom paper, and the fibers pulled out from the cracks will be adhered by the adhesive. live. The occurrence of cracks may be continuous or random, and may occur on one side or the other side of the reel material. Therefore, before the adhesive material is printed on the machine, it is necessary to carefully inspect the bottom paper. If there is a small crack on the dough paper.

Then, take a piece of paper that has been inspected as described above, peel off the backing paper and check again whether there is a crack in the bottom paper and the bottom paper, because cracks are sometimes very small and can only be found after separating the backing paper and face paper. It is worth noting that since inks and adhesives gradually accumulate on the paper guide rollers of the printing machine during printing, cracks may also appear on the edge of the adhesive material. Therefore, even if printing has started, the above problems cannot be ignored.

3, check whether the adhesive material edge adhesion, whether the bottom paper coating silicon

Adhesive edge adhesion or partial coating of silicone oil on the bottom paper will cause the paper to break when discharged and cannot be produced normally during the printing process. Therefore, before printing, take a piece of adhesive material that is about 1 meter long, peel it off by hand, and see if there are parts on the edge or other parts that cannot be smoothly and uniformly peeled off. In general, the edge-to-edge adhesion of the tissue paper and the backing paper occurs on a slitting roll of a roll-coating adhesive material, and generally occurs only at the outer layer of 7 to 10 meters. Therefore, the slitting roll is encountered. There is adhesion at the edge of the sticker and do not immediately assert that the entire roll has this problem.

In addition, it should be noted that peeling off lightweight papers (such as 60 g/m2 and 80 g/m2 paper) uses a larger force than a peeling paper, and the lighter the paper, the tighter the peeling feel. Because of this, it is sometimes impossible to finish at the normal printing speed when the customer selects the self-adhesive material in the shape required by the customer.

4, check roll reel material cut end surface is straight, rewind tightness is consistent

If the roll-cut adhesive material is not evenly cut, it will not only affect the registration at the time of printing, but also cause difficulties in waste disposal due to the change in the cutting position; the inconsistent elasticity during rewinding will cause the paper force during printing. Variations and uneven tension can also cause print quality problems.