Scotch tape material determines the quality of the tape itse
Previously, for seam sealing tape, the transparent material is used cellophane tape, kraft paper, polypropylene film. The pressure sensitive adhesive coated on one or both sides of the substrate, the drawback is the edge of the tape is easy to tear. To avoid this disadvantage, the use of a substrate has high strength polyester film. However, the higher cost of vinegar polyethylene film substrate, it is difficult widely used.
Recently, used corrugated board boxes sealing strip, which substrate to use more paper, cloth, polypropylene and polyvinyl chloride films. Scraping the hot melt adhesive on one or both sides. Strength of paper substrates is not high, and the use of a different plastic film or textile reinforced paper substrate of transparent tape material is not easy tearing by hand, very easy to use. Polypropylene and poly vinyl grip tape Po transparent film substrate material, its low temperature brittleness. Polyethylene and PVC substrates, their greater stiffness, tensile large elastic modulus, elongation of 5%. Such materials for the substrate with the adhesive tape as a frozen food container is sealed, at lower temperature conditions. In the passenger uneven surface of the site, the tape will peel off due to tensile stress.
Easy to manufacture by hand tearing of adhesive tape, scotch tape tensile strength despite the material is still very high. This transparent tape inexpensive material cost, ease of application. Its production process is simple, and cold well. Base material tape made of high density polyethylene (density greater than 0.94% g / cm 3), the transverse and longitudinal drawing ratio was 6: 1 coated with a pressure sensitive adhesive (single-coated on a polyethylene substrate and failure), the other transparent tape material coated with another layer of pressure sensitive adhesive also. Between the high-density polyethylene film with a layer of pressure-sensitive paper can be caught.
No matter what form of adhesive tape, it is important that a transparent material having a high density polyethylene tape should be greater than 0.94% density g / cm 3, and, transversely of the longitudinal stretching ratio should be more than 6 times, preferably 10 times. Scotch tape material requirements of high density polyethylene has a density of not less than 0.94% g / cm 3 reason, in order to ensure the substrate has a higher transverse strength at low temperatures.