Strength requirements and deep influence of glass protective film

- Aug 28, 2020-

When the glass protective film is die-cutting, the surface material and the adhesive must be cut through together. However, in theory, die-cutting paper materials is a comprehensive result of tool cutting and paper fracture, that is, the cutting edge will also cut the paper. Squeeze to both sides, so, relatively speaking, the die-cutting accuracy of paper materials is not very high. When analyzing samples, it is often seen that some labels have burrs. This is due to the fact that the material is relatively thick and naturally broken.

The glass protective film is based on the die-cutting characteristics of paper-like materials, and considering the wear of the blade, the angle of the flat die-cutting blade of the PE protective film manufacturer is 52°. It is assumed that the angle is large and the deformation of the material is large. That is to say, the horizontal tendency of the discrimination force will aggravate the material fracture discrimination. Because most of the film materials are tough and will not break naturally, it is not appropriate to cut through two-thirds of the thickness. It must be completely cut through or through four-fifths of the thickness, otherwise it will be peeled off along with the label when it is discharged.

The strength of the surface material of the glass protective film is related to the thickness of the surface material, fiber (polymer) structure and its own humidity. In the die-cutting process of PET protective film materials, a major factor related to the surface material is the speed of waste discharge. The higher the humidity, the weaker the strength of the PE protective film manufacturer's material after being damp, and then it can be pulled off at will, and it is even impossible to discharge waste.

When the glass protective film is in use, the thickness of the surface material will directly affect the depth of die cutting. The thicker the material during use, the more die-cutting will be. Because the thicker the material, the greater the die-cutting tolerance, and the smaller the chance of cutting through the bottom paper. Relatively speaking, the material is thin, and the defect of cutting through the bottom paper randomly appears. For example, it can distinguish die-cutting 80g/m2 and 60g/m2 on a flat-bed label die-cutting machine with the same bottom paper. The results found that: 80g/m2 material die-cutting and waste discharge are normal, but when 60g/m2 material is replaced, waste discharge breakage, bottom paper cut-through and loss of marks often occur during die-cutting, and it is necessary to frequently stop the machine and perform printing.