In our daily life, we can see or use Bopp sealing tape everywhere. Some enterprises buy a lot of sealing Bopp tape in the process of purchasing. But after a period of time, more and more adhesive tape will be used later. Why is the sealing tape not sticky? Some Bopp tapes are very sticky when touched by hand. As a result, the sealing effect is not good. They are always opened by themselves. Any tape chosen is the same. Why on earth? Let's explain it to you.
Bopp Sealing tape
It's a problem of glue. It's very sticky when touching it. It's a good initial adhesion. When it's glued, it jumps off by itself. It's a poor adhesion. The initial adhesive force is inversely proportional to the holding force, that is to say, if you touch the very sticky sealing tape with your hand, the holding force will be poor.
Glue generally has a high solid content and good viscosity. The common solid content on the market is about 50. If you want to have a good viscosity, you'd better use 52 solid content. But the price may differ by 200 yuan a ton. The thickness of the coating is also related. Generally, the thickness of the coating is about 20-22. The thinner the coating, the worse the viscosity, but not the thicker the coating, the better the viscosity. The drying temperature depends on the actual operation, and it is also related to the running speed of the machine.
Generally, the sealing tape is OPP film coated with water glue. The initial and holding forces are not good. Its biggest characteristic is low price. It is recommended not to pull too tight when using, because the film will be stretched, so that when the adhesive is not enough, it will rebound. In addition, you can use the back of a scissors knife or an art knife to scrape and press down the seal after sealing the case. Make the adhesive tape and paper more firm so that it is not easy to break.
In winter, because the temperature is lower, the glue will be less sticky. You can change it into oily glue, thicken the glue layer, or put the tape in the warm room.