Common Coated Film

日期:2019/10/7 9:15:10 / 阅读: / 来源:本站

Common coated film
1. Heat sealable coating film
Applying a layer of heat-sealing coating on the substrate film, which is mostly used for outer carton packaging of sugar and smoke, requires low sealing strength, and applies a heat-sealing coating on the substrate film, such as BOPP, such as Chlorinated polypropylene heat seal coating.
2. Thermal adhesive tape
Coated with rubber type adhesive, acrylic adhesive, hot melt adhesive, liquid curable adhesive, etc. on kraft paper, cloth base, biaxially oriented polypropylene film, biaxially oriented polyester film, and hard polyvinyl chloride film substrate. Thermal tape is widely used in packaging.
3. Metal and non-metallic surface protection film
(1) Metal protective film
It can be used not only for surface protection of various metal materials, but also for avoiding scratches during transportation, maintaining surface gloss, anti-corrosion and anti-rust, and also can be used for various decorative boards, plastic sheets, metal products and petroleum pipelines. Anti-corrosion and surface protection, can also be used for secondary processing of metal materials, metal protective film adhered to metal materials, uncovering metal materials without any pressure sensitive film (ie, self-adhesive) residual glue, does not pollute the surface to be bonded Does not corrode metal materials and does not react with any chemically affected surfaces.
The structure of the self-adhesive metal protective film is composed of a substrate, a primer, and a top coat. First, corona treatment is performed on the substrate, and then the primer and the surface glue are applied, dried, crimped, slit, and packaged.
(2) Self-adhesive metal protective film substrate
There are many kinds of substrates for the protective film. Theoretically, any substrate can be used as a substrate as long as the pressure-sensitive adhesive can be applied to a suitable thickness.
The main plastics used in the substrate of the protective film are: cellophane, cellulose acetate sea film, polyvinyl chloride, polypropylene, poly, polystyrene film, etc. The most used is biaxially oriented polypropylene film, followed by single The polyethylene film is stretched.
(3) Processing of the substrate
In order to improve the adhesion of the substrate to the adhesive, it is necessary to corona treatment on the surface of the substrate. The surface tension of the polypropylene film is generally 29 mN/m, and the surface tension of the adhesive is 38 mN/m. Ozone is generated by corona to oxidize the surface of the substrate, and a polar group of C=0, -OR, -C00H increases the adhesion.
(4) Adhesive
1) Type of pressure sensitive adhesive 1 Acrylic: 2 Solvent type: 3 Water type: 1 Rubber type: 5 Hot melt adhesive
2) Various adhesive characteristics 1 Acrylic, pressure sensitive adhesive has good weather resistance, the solvent is ethyl acetate, toluene, methyl ethyl ketone, etc., a wide variety, but the price is more expensive. 2 Solvent-based pressure-sensitive adhesives are widely used, but there are common problems in the pollution, and it is necessary to add a solvent recovery process or to a solvent-free pressure-sensitive adhesive. 3 water-type pressure-sensitive adhesives are available in both aqueous and aqueous emulsion types. They have the advantages of low cost, safety and pollution-free, but the products have poor water resistance, poor electrical properties, long drying time and high energy consumption. 4 rubber pressure sensitive adhesive, widely used, easy to obtain materials, simple manufacturing method, low price, but most of the solvent is solvent gasoline, toluene, n-hexane, trichloroethane, etc., so there is chemical pollution, production Need to increase solvent recovery.


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