How To Detect The Quality Problems Of Self-adhesive Materials

1. Check whether the edges of self-adhesive materials are adhered, whether the backing paper is not coated with silicon, and whether the edges of self-adhesive materials are adhered or some areas on the backing paper are not coated with silicon oil. During the printing process, the surface paper will be broken during waste discharge and cannot be produced normally. Therefore, before printing, take a section of self-adhesive material about 1 meter long and peel it off by hand to see if there is any part on the edge or other parts that cannot be stripped smoothly and uniformly. Generally, the adhesion between the edge of the face paper and the bottom paper occurs on a slitting roll of the whole roll of coated self-adhesive material, and generally only occurs at the outer layer of 7m ~ 10m. Therefore, when there is adhesion on the edge of the slitting roll of self-adhesive material, do not immediately assert that the whole roll of paper has this hairy disease. In addition, it should be noted that the force used to peel the tissue paper with light weight (such as 60g / m2 and 80g / m2 tissue paper) is greater than that used to peel the tissue paper with heavy weight. The lighter the tissue paper, the tighter the hand feel when peeling. Because of this, sometimes when cutting the self-adhesive material selected by customers according to the shape required by customers, it can not be completed at the conventional printing speed.

2. Check whether the self-adhesive material has rough edges. The smooth and undamaged edges of the drum self-adhesive material are the basis to ensure the printing quality of the self-adhesive label. Therefore, before printing and processing, carefully check whether the slitting edges of the drum self-adhesive material have rough edges and whether they are damaged due to improper storage and transportation, and roll down the drum self-adhesive material for 4-5 turns and carefully check the slitting edges.

3. Check whether there are cracks on the self-adhesive material. When cutting the self-adhesive material, if the cutting tool is not adjusted properly or the blade is not sharp enough, cracks will appear on the surface paper or bottom 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 or random. They may appear on one side of the self-adhesive material on the drum or on both sides. Therefore, before the self-adhesive material is printed on the machine, it is not necessary to carefully check whether there are small cracks on the bottom paper and face paper. Then, take a section of sample paper that has passed the above inspection, peel it on 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, which can be found only after separating the bottom paper and the top paper. It is worth noting that the ink and adhesive will gradually accumulate on the paper guide roller of the printing machine during the printing process, which will also cause cracks on the edge of the self-adhesive material. Therefore, even if printing has been started, the above problems cannot be ignored.

4. Check whether the slitting end face of the drum self-adhesive material is 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 lead to waste discharge difficulties due to the change of die-cutting position; Inconsistent tightness during rewinding will cause the change of paper tension during printing, and uneven tension will also cause printing quality problems.

5. Before using different types of self-adhesive labels, it is important to test the type of adhesive to see whether this adhesive belongs to self-adhesive, heat sealing adhesive or adhesive coated water paper. Some adhesives react chemically with specific substances. For example, self-adhesive labels used as signs will pollute some special fabrics under specific conditions. Some labels that require short-term stickiness will produce long-lasting stickiness under exposure conditions. On the other hand, some labels that need to have lasting adhesion will lose their adhesion on some surfaces