The application range and coating performance of high-temperature resistant protective film are key to production

The application range of high temperature resistant protective film.

1. Electroplated aluminum hot stamping (hot stamping) is a special printing process that does not use ink. With the help of certain pressure and temperature, it is applied to the template installed on the hot stamping machine, so that the printed product and the hot stamping foil are pressed against each other in a short period of time. The metal foil or color of the infinite UV power supply is transferred to the surface of the hot stamping product according to the graphic and text of the hot stamping template, commonly known as hot stamping. Here, the plastic film (hot stamping film) is only used as a carrier.

2. Printing composite film. In order to enhance packaging effect and barrier performance, achieve complementary performance and adapt to sealing needs, paint spray gun printing composite film is often used as packaging material. The composite methods include dry composite, wet composite, extrusion composite, co extrusion composite, etc.

3. Vacuum aluminum coating film. Vacuum aluminum coating film is made by evaporating a very thin layer of metal aluminum on the surface of high-

temperature resistant PET protective film using a special process, which gives the film surface a metallic luster and greatly improves its barrier properties. Therefore, vacuum aluminum coating film has been widely used in the packaging of food, medicine, and industrial products.

4. Card protection film, made of high-temperature resistant PET protective film as the substrate, extruded and coated with a layer of heat sealable hot melt adhesive (such as EVA), is used to protect the surface of various documents including ID cards, document files, photos, etc.

In the packaging industry, there is a special protective material called surface protective film, which is applied to the surfaces of various metal plates, plastic plates, glass, etc. During transportation, processing, storage, and use, the fine surface of the item is protected, which requires high-performance pressure-sensitive protective adhesive/acrylic adhesive/PU adhesive.

The viscosity and other rheological properties of adhesives are important properties that affect the coating behavior of surface protective films. Based on the dependence of viscosity on shear rate, fluids can be classified into three types: Newtonian fluids, expansive fluids, and pseudoplastic fluids. According to the change in viscosity shear time, fluids can be classified into Newtonian fluids, thixotropic fluids, and rheological fluids. The greater the deviation of adhesive rheological properties from Newtonian fluids, the more likely various quality problems are to occur during coating operations.

The key to producing surface protective film is to choose the appropriate coating method and coating machine based on the coating performance of the protective film and the specific requirements for the protective film, and determine the various process parameters for the operation of the coating machine.