In order to avoid the printing failure caused by the quality problem of the adhesive labels roll
material itself as far as possible, it is necessary to carefully check the appearance quality of the adhesive labels roll material before printing, so as to find out the defects that may cause the quality problem of the printing process in time before printing.
1. Check whether the adhesive labels roll material has fur edges.
The smooth and non-destructive edge of the coiling block adhesive labels roll material is the basis to ensure the printing quality of the adhesive labels roll material. Therefore, it is necessary to carefully check whether the cutting edge of the coiling block adhesive labels roll material has wool edge before printing and processing, whether it has been damaged due to improper storage and transportation, and to roll the drum adhesive material down 4-5 laps, carefully checking its cutting edge.
2. Check whether there are cracks in the adhesive labels roll material.
During the cutting of the adhesive labels roll material, if the cutting tool is not adjusted properly or the cutting edge is not sharp enough, cracks will appear on the surface paper or the base paper of the adhesive labels roll material, and the fibers pulled out from the cracks will be bonded by the adhesive. Cracks may occur continuously or randomly. They may occur on one side or both sides of the adhesive labels roll. Therefore, it is necessary to carefully check whether there are small cracks on the base paper and the surface paper before printing of the adhesive labels roll.
Then, take a sample paper which has been checked above and peel it on the bottom paper to check again whether there are cracks on the top paper and the bottom paper, because the cracks are sometimes very small and can only be found after separating the bottom paper from the top paper. It is noteworthy that the ink and adhesives will gradually accumulate on the guide roll of the printing press during the printing process, which will also cause cracks on the edge of the adhesive material. Therefore, we can not ignore the above problems even if printing has started.
3. Check whether the edge of the adhesive labels roll material is adherent and whether the base paper is leaked with silicon.
Silicone oil is leaked on the edge of the adhesive labels roll material or part of the base paper, which will cause the surface paper to break when discharging waste in the printing process and can not be produced normally. Therefore, we should take a piece of adhesive labels roll material in one meter long and peel it off by hand to see if the edge or other parts can not be smoothly and uniformly peeled off before printing. Usually, the edge adhesion of face paper and bottom paper occurs on a slitting roll of the whole coated adhesive labels roll material, and generally only occurs in the outer layer of 7-10 meters. Therefore, when there is adhesion on the edge of the slitting coiling block adhesive labels roll material, do not immediately assert that the whole roll of paper has this problem.
In addition, it should be noted that the stripping of light surface paper (such as 60G/ m2 and 80G/ m2 surface paper) needs more force than the stripping of heavy surface paper. The lighter the surface paper is, the tighter the feel of the stripping is. Also because of this, sometimes cutting adhesive labels roll material customer chooses, according to the shape of customer requirements, can not be completed at the normal printing speed.
4. Check whether the slitting end face of coiling block adhesive labels roll material is straight and the rewinding tightness is consistent.
If the slitting end surface of coiling block adhesive labels roll material is not uniform, it will not only affect the alignment of printing, but also cause discarding difficulties due to the change of die cutting position; inconsistent tightness in rewinding will cause the change of paper force in printing, and uneven tension will also cause printing quality problems.