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The greater the deviation of the rheological properties of the adhesive of PVC Decorative Film from the Newtonian fluid, the easier it is to have various quality problems during the coating operation, especially when the adhesive exhibits the properties of an expanding body, since its viscosity will increase with the coating process. The coating speed increases rapidly, and a larger mechanical force must be used to spread the adhesive. Therefore, the faster the coating speed, the more difficult it is to obtain a uniform coating, and the substrate is often pulled due to excessive force, or even Damage the blade and seal the pet film When the adhesive exhibits thixotropic properties, the leveling of the adhesive layer is poor when the pet film is coated, so it is difficult to obtain a smooth and smooth adhesive layer.
The production process of sealing pet film and the equipment used vary depending on the type of adhesive and the type of substrate, generally including: glue making, coating, drying, coiling, slitting, packaging and other processes. The so-called coating process of sealing pet film and adhesive refers to the process in which a specially designed coating machine uniformly coats the adhesive on the substrate. In order to produce high-quality protective film products, in addition to selecting suitable adhesives, substrates, primers and release agent materials, the most important thing is to design the most appropriate coating process and corresponding equipment.
