Why are some scotch tapes not sticky? Some tapes are sticky by hand, but the sealing effect is not good, and they are always opened by themselves. Any good scotch tape is of the same quality. select?

This is a problem with glue. It feels sticky when you touch it. This is good initial adhesion. After sticking, it jumps off by itself. The initial adhesion and holding power are proportional. That is, if you touch a very sticky scotch tape with your hand, the holding power will be poor.

Glue generally has a high solid content, and the viscosity will be good. The used solid content on the market is about 50. If the viscosity is good, it is best to use a solid content of 52. But prices may differ by 200 yuan a ton. The thickness of the glue is also related. Generally, the thickness of the glue 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 is also related to the speed of the machine.

Generally, Scotch tape is OPP film coated with water glue. Its initial adhesion and holding power are not good. Its biggest feature is its cheap price. It is recommended not to pull too during use, because the film will be stretched. so that it will rebound when the adhesive is not sticky enough. Also, you can use the back of scissors or the back of a utility knife to scrape the seal after sealing. Make the tape and paper adhere more so that it is not easy to break.