During transport, storage, processing and assembly of many commodities, it is often necessary to protect their surfaces against corrosion by harmful gases or microorganisms, dust contamination, or scratches caused by mechanical scuffing. One of the most common methods used to protect the surface of materials is to cover the surface of the object to be protected with a layer of protective film (i.e., surface protection film), and then remove the film after the end of transport, storage, processing and assembly.
Surface protection film is a packaging film developed to protect the surface of commodities, in fact, it is a special pressure-sensitive adhesive film, consisting of a substrate layer and a pressure-sensitive adhesive layer. Surface protection film is also referred to as protective film or surface protection tape, it is easier to use than the use of surface protection coatings have easy to use, inexpensive, reliable results and other comprehensive advantages, so more and more for people to pay attention to the rapid development. Nanjing Suminoe Precision Professional Protective Film Production Line
The development and application of surface protection film originated in the 1970s. Japan, the United States and Europe and other industrially developed countries and regions, after more than thirty years of promotion and use and continuous updating, whether in terms of varieties, performance or scale of production and so on, there has been tremendous development. According to the relevant literature, the United States in 2002, the total sales value of pressure-sensitive adhesive tape nearly 5.9 billion U.S. dollars, of which the amount of protective film is about 10% of the pressure-sensitive adhesive tape. In China, the development and application of protective film started late, in recent years, although in some areas of industrial production, but not only still exists in the product variety is not much of a problem, the scope of application and the application of the amount is also quite limited. At present, the surface protection film has been continuously in the instrument, instrumentation, electronics, machinery, construction, automobile manufacturing and signage industries to obtain a wide range of applications, in metal, plastic, glass, various types of paint panels, stone, wood, and other materials surface protection, have achieved good results. Nanjing Suminoe Precision Professional Protective Film Production Line

The application of protective film improves the appearance quality of products, facilitates material processing, and also improves the utilisation rate of materials and reduces the production cost of products.
1.General characteristics of surface protection film
The general characteristics of surface protection film can be briefly summarised in the following aspects:
① surface protection film is inert to the surface of the protected material, does not react with the surface, does not corrode, pollute the surface;
② surface protection film on the protected material has a good adhesion to the raw energy, in the material handling and processing, the protective film will not buckle, fall off, the surface of the protected material can be reliable protection;
③ surface protection film has a good weather resistance, adhesive stability, after several days or long paste, peeling force does not significantly increase, the film is still easy to remove, in the removal of the surface protection film, the surface to be protected by no residual adhesive residue;
Surface protection film has good adaptability to meet the needs of deep processing of the protected object.
2. The composition of the surface protection film
As mentioned earlier, the surface protection film is a special pressure-sensitive adhesive film, the natural basic composition and ordinary pressure-sensitive adhesive film, by the substrate and pressure-sensitive adhesive two major components.
(1)Substrate
Surface protection film substrate, mainly paper and plastic film two categories. Paper categories such as kraft paper, manila hemp paper, mulberry paper, plastic coated mulberry paper, etc.; plastic film such as polyethylene film, polypropylene film, PVC film, polyester film, polyethylene / polypropylene mixed or co-extruded film, polyethylene / ethylene vinyl acetate co-polymer (EVA) co-extruded film, etc.. Paper substrate strength is low, poor flexibility, opaque, and is not suitable for the production of those who need to bend, cut, stamping, punching and other secondary processing materials used in the surface protection film, the application of a greater limitation. Polyethylene film and other plastic films have good transparency and elongation, processing adaptability is good, as a surface protection film substrate, the application surface is wider. Nanjing Suminoe Seiko professional protective film production line
(2) Pressure-sensitive adhesive
In principle, for the production of pressure-sensitive adhesive film, pressure-sensitive adhesive tape of all kinds of pressure-sensitive adhesive can be used for the production of surface protection film, but because the surface protection film is different from ordinary pressure-sensitive adhesive tape, it is not only required to stick firmly in use, but also requires easy to uncover, and in the uncovering, do not allow in the protected surface of the residual adhesive presence, so for the pressure-sensitive adhesive for the surface protection film, there are its strict additional requirements. As a surface protection film, one of the most basic requirements is that the adhesive tape adhesive base force ＞ cohesive force ＞ adhesive force, in addition often need to be based on the protection of different objects, to set a suitable adhesive force (generally in the range of 0.1 ~ 10N/25mm), so the surface protection film of the pressure-sensitive adhesive requirements for pressure sensitive adhesive tape than the ordinary pressure-sensitive tape with pressure-sensitive adhesive is higher, and the production of the surface protection film of the technological content of the film is also higher than the ordinary pressure-sensitive adhesive film. Higher.
3. Production method of surface protection film
Production of pressure-sensitive adhesive film technology, in principle, can be used to

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