How to check the appearance of dry collagen material

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

1. Check whether the self-adhesive material has burrs

The edge of the roll of self-adhesive material is smooth and non-damaged, which is the basis for ensuring the printing quality of the self-adhesive label. There is damage due to improper, and the roll of self-adhesive material should be rolled down 4-5 times, carefully check its slitting edge.

2. Check for cracks on the adhesive material

When the self-adhesive material is slit, if the cutting tool is not adjusted properly or the blade is not sharp enough, cracks will appear on the top or bottom paper of the self-adhesive material, and the fibers pulled out of the crack will be stuck by the adhesive. live. The occurrence of cracks may be continuous or random, may occur on one side of the roll of self-adhesive material, or may be on both sides. Therefore, before the machine is printed on the machine, you may have to carefully check the backing paper Is there a small crack on the facial paper?

Then, take a piece of sample paper that has passed the above inspection, peel it to the backing paper and check again whether there is a crack on the bottom paper and the backing paper. Because the cracks are sometimes very small, they can only be found after separating the backing paper and the facing paper. It is worth noting that, because ink and adhesive will gradually accumulate on the paper guide roller of the printing machine during the printing process, it will also cause cracks on the edge of the self-adhesive material. Therefore, even if printing has already started, the above problems cannot be ignored.

3. Check whether the edges of the self-adhesive materials are stuck, and the bottom paper is not coated with silicon

The edges of the self-adhesive materials are stuck or there are some areas on the backing paper that are coated with silicone oil. During the printing process, the facial paper will be broken during waste disposal, and it will not be produced normally. Therefore, before printing, take a piece of self-adhesive material with a length of about 1 meter and peel it off by hand to see if there are any parts that can not be peeled off smoothly at the edges or other parts. Usually, the edge adhesion of the top and bottom paper occurs on a slit roll of the coated roll of self-adhesive material, and generally only occurs at 7 to 10 meters on the outer layer. Therefore, the slit roll does not There is adhesion on the edge of the dry material, do not 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 / m² and 80g / m² of facial paper) requires more force than the peeling of heavy-weight facial paper. The lighter the facial paper, the tighter it feels when peeling. Because of this, sometimes when cutting the self-adhesive material selected by the customer according to the shape required by the customer, it cannot be completed at the normal printing speed.

4. Check whether the cutting end face of the self-adhesive material of the reel is straight and the rewinding is consistent

If the slit end face of the self-adhesive material of the roll is uneven, it will not only affect the registration during printing, but also cause difficulty in discharging due to the change of the die cutting position; inconsistent tension during rewinding will cause paper force during printing Variations and uneven tension will also cause print quality problems.

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