How to check the appearance of non-dried collagen material
In order to avoid as much as possible the label printing failure caused by the quality problem of the self-adhesive material itself, it is necessary to carefully check the appearance quality of the self-adhesive material before printing. Defects that may cause printing process quality problems can be found in time.
1. Check whether the self-adhesive material has burrs
The edge of the roll of self-adhesive material is smooth and undamaged, which is the basis for ensuring the quality of the self-adhesive label printing. Therefore, printing Before processing, you must carefully check whether the slitting edge of the roll of adhesive material has burrs, whether it is damaged due to improper storage and transportation, and roll down the roll of adhesive material for 4 & mdash; 5 circles, and carefully check the division. Cut the edges.
2. Check whether there are cracks on the self-adhesive material
When the self-adhesive material is slit, if the slitting tool is not adjusted properly or the blade is not sharp enough, it will not dry Cracks appear on the top paper or bottom paper of the glue material, and the fibers pulled out from the cracks will be stuck by the adhesive. The occurrence of cracks may be continuous or random, and may appear on one side of the roll of adhesive material, or on both sides. Therefore, before the adhesive material is printed on the machine, you may need to carefully check the backing paper. Whether there are small cracks on the facial tissue.
Then, take a piece of sample paper that has been checked above, peel it off the backing paper and check again if there are any cracks on the backing paper and backing paper, because the cracks are sometimes very small, only separate the backing paper and the top paper It will be discovered later. It is worth noting that the ink and adhesive will gradually accumulate on the paper guide roller of the printing press during the printing process, which will also cause cracks on the edge of the self-adhesive material. Therefore, even if printing has already begun, the above problems cannot be ignored.
3. Check whether the edges of the self-adhesive material are stuck, and whether the bottom paper is missing silicon
The edges of the self-adhesive material are stuck or there is a part of the bottom paper that misses the silicone oil, in printing During the processing, the tissue paper will break during the waste discharge, and the normal production will not be possible. Therefore, before printing, take a length of about 1 meter of self-adhesive material and peel it off by hand to see if there is any part that cannot be peeled smoothly and uniformly on the edge or other parts. Usually, the edge adhesion between the face paper and the bottom paper occurs on a slit roll of the entire roll of coated self-adhesive material, and generally only occurs at 7 to 10 meters from the outer layer. Therefore, the slit roll does not There is adhesion on the edge of the dry glue material. Don't immediately assert that the entire roll of paper has this problem.
In addition, it should be noted that the peeling of light-weight facial paper (such as 60g/square meter and 80g/square meter) is more force than peeling heavy facial paper. The lighter the facial paper, The tighter the hand feel when peeled off. Because of this, sometimes when die-cutting the self-adhesive material selected by the customer according to the shape required by the customer, it cannot be completed at the regular printing speed.
4. Check whether the slitting end face of the reel adhesive material is straight and whether the rewinding tightness is consistent
If the slitting end face of the reel adhesive material is uneven, not only It will affect the registration during printing, and it will be difficult to discharge waste due to the change of die-cutting position; inconsistent elasticity during rewinding will cause changes in paper force during printing, and uneven tension will also cause printing quality problems.
