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What is the key to producing a surface protection film?

What is the key to producing a surface protection film?

In the packaging industry, there is a kind of protection material called the surface protection film, stick it in metal plate, plastic board, glass and other surfaces, in transportation, processing, storage, and use, the surface of the article to protect, this requires the good performance of the pressure-sensitive protection adhesive.

Adhesive viscosity and rheological properties of the other is the property of surface protection film coated behavior is more important, according to the viscosity with shear rate, the fluid can be the difference as a Newtonian fluid, expansion and fake plastic three, and in accordance with the shear viscosity changes of the time, the fluid is a Newtonian fluid, touch the variant and flow variation, the rheological properties of adhesive from the Newtonian fluid, the greater the more prone to quality problems in the operation of the coating, when adhesive to present the nature of the expansion body, because of it in the process of coating viscosity will be increased with the increase of coating speed increase.

The key to the production of surface protection film is to select the suitable coating method and coating machine according to the coating performance and specific requirements of the protection film and decide the technological parameters of coating machine operation. With greater mechanical force to make the adhesive spread, so the faster the coating speed is not easy to get a uniform coating, but also often due to too much force and break the substrate, may damage the scraper, when the adhesive presented thixotropic performance, coating when the leveling property of the adhesive layer is very poor, so it is difficult to get smooth adhesive layer.