PE protective film little knowledge

For Polyethylene PE, full name, is the most simple structure of the macromolecular organic compounds, the world's most widely used polymer material protective film, in a special Polyethylene (PE) plastic film as the backing material polymerization. Depending on the density is divided into high density PE protective film, medium density Polyethylene and low density Polyethylene, and its properties of softness, viscosity can be good, easy to paste, easy stripping, stripping without glue.

PE depends on the performance of its polymerization way; In the medium pressure (15 to 30 atmospheric pressure) organic compound catalytic conditions Ziegler - Natta polymerization of high density polyethylene (HDPE). Protective film under the conditions of the polymerization of polyethylene molecules is linear, and the molecular chain is long and the molecular weight is as high as hundreds of thousands of. If it is in the high pressure (mpa), 100-300, high temperature (190-210 C) protective film factory, superoxide radical polymerization, under the condition of catalytic production is low density polyethylene (LDPE), it is branched structure. Polyethylene insoluble in water, water imbibition is small, it is of some chemical solvents, such as toluene, acetic acid, etc.

Only when the temperature above 70 ℃ dissolve showing modest. But the grainy polyethylene, protective film can be between 15 ℃ and 40 ℃ melting or solidification, along with the change of temperature at higher temperatures melt, absorbing heat; At lower temperature solidification, gives off heat. Protective film factory water quantity is small, and because it is not easy to damp, good insulation performance, so is a good building materials. PE protective film the biggest advantage is protected products in production and processing, transportation, storage and use process from pollution, corrosion, scratches, protect the original bright and clean bright surface, thus improve the quality of the products and market competitiveness.

PE protective film applications are as follows: stainless steel plate, aluminum plate, aluminum profile and plastic profile and doors and Windows, aluminum-plastic plate, fluorine carbon plate, mirror plate, sandwich choi steel, fire prevention board, veneer, organic glass plate, PS, PE, PVC board sunshine board (polycarbonate plate), security doors, panels, coated glass, high-grade furniture, the top-grade handicraft, electrical cabinet, computer case, automobile lamps and lanterns, floor, household appliances shell, instruments and meters, all kinds of fields such as needed to protect the surface of a product can be used. A, according to the different types of protective film classification for the following two kinds:

1.According to the material can be divided into: PE, PVC, PET, PP, TPU, PU PU and TPU is mainly used in shoes and BAR, here we don't do detailed introduction. PE: polyethylene, widely used in the coating industry, the main characteristic is that the price is low, soft, good extensibility, environmental protection free from contamination, such products are generally through the eu ROHS environmental pollution test. Disadvantages: poor weatherability, the material used is not suitable for high temperature, average temperature within 60 degrees. PVC, polyvinyl chloride (PVC), its characteristic is: good flexibility, good weather resistance (SPVC); Disadvantages: not environmental protection, so seldom useful to this kind of material of many international brands of products. This product is mainly used for esd protection is more, there are wooden box surface. PET: polyester, its main characteristics: good weather resistance, resistant to high temperature 100-100 degrees, good hardness, smooth; Disadvantages: cannot be used for Angle or the corner of the product. Mainly use the die cutting. PP: polypropylene, its characteristic: combined with the characteristics of the PE, PVC, soft, high temperature resistant, environmental protection, is mainly used in LCD industry.

2.According to the glue points: acrylic (PMMA) rubber, rubber, silica gel (oerlikon Taiwan said: bad) acrylic adhesive; Widely used, good transparency, stability. But there will be a difference, along with the change of time and environment such as the longer viscous force. Rubber: mainly used in steel industry in black and white film, blue film, metal stamping and so on. Its main advantages: 1 in speed, smooth. Weakness: the impurity is more, short shelf life. Silicone: high price, high temperature resistant, disadvantages: film separation often occurs when use. It is mainly used for scratch-resistant post, etc. Second, the structure of the printing film Currently on the market of the protective film both sides roughly divided into three kinds of structure: at the grass-roots level and besmear respectively 1, general process, the glue evenly coated on the base material. Grassroots colloidal particles mixed with base material layer 2, co-extrusion process, the colloidal particles mixed with base material, surface without glue, but have a certain cohesion, Won't produce glue phenomenon. Third, protective film, the general specifications and colors 1) PE protective film thickness: 0.03 mm to 0.15 mm 2) color: transparent, blue, black, ivory, black white complexion, special color can be according to the customer 3) width: 1650 mm, length within 1000 m (4) adhesion: 5-610 - g/a 50 mm