How to check the quality of double-sided tape?
1. Check for cracks on the double-sided tape:
When the double-sided tape is cut, if the cutting tool is not properly adjusted or the blade is not sharp enough, cracks will appear on the face paper or the bottom paper of the double-sided tape, and the fiber pulled out at the crack will be stuck by the adhesive. The occurrence of cracks may be continuous or random, and may occur on one side of the double-sided tape of the roll, or on both sides. Therefore, before machining on the double-sided tape, Carefully check the bottom paper and surface paper whether there are small cracks.
Then, take a sample of the paper that has been inspected, peel it off the backing paper, and check again for cracks on the underlying paper and the backing paper, because the cracks are sometimes very small and can only be found after separating the backing paper and the paper.
2. Check if the double-sided tape has a burr:
The edge of the double-sided tape of the reel is smooth and non-destructive, which is the basis for ensuring the quality of the double-sided tape. Therefore, it is necessary to carefully check whether the slit edge of the double-sided tape of the reel has burrs before processing, and whether it is damaged due to improper storage and transportation. And roll the double-sided tape of the reel 4-5 turns and carefully check the slitting edge.
3. Check if the edge of the double-sided tape is stuck, and if the bottom paper is leaking silicon:
The edge of the double-sided tape is stuck or a part of the bottom paper is leak-coated with silicone oil. During the processing, the facial paper breaks during the waste process and cannot be produced normally. Therefore, before processing, take a piece of self-adhesive material about 1 meter long, peel it off by hand, and see if there are any parts on the edge or other parts that cannot be smoothly and consistently peeled off. Usually, the edge paper and the bottom paper edge adhesion occur on a slit roll of the entire roll of the coated self-adhesive material, and generally only occurs in the outer layer of 7 meters to 10 meters, so that the cut roll is encountered. There is adhesion on the edge of the double-sided tape. Do not immediately assert that the whole roll of paper has this problem.
In addition, it should be noted that peeling off light-weight facial tissues (such as 60g/m2 and 80g/m2 facial tissue) is greater than the force used to peel off heavy-weight facial tissue, and the lighter the facial tissue, the tighter the hand feel when peeling off. Because of this, sometimes the double-sided tape selected by the customer is cut according to the shape required by the customer, and cannot be completed at the normal processing speed.
4. Check whether the slit end face of the double-sided tape of the reel is straight and the rewinding is consistent:
If the slit end face of the double-sided tape of the reel is not uniform, it will not only affect the registration during processing, but also cause difficulty in discharging due to the change of the die-cut position; the inconsistency of the re-winding during rewinding will cause the change of the paper force during printing. Uneven tension can also cause print quality problems.