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Plastic film for packaging the secondary processing


Dichloroethylene air brush spreader to complete. In recent years, in order to reduce costs, but also to protect the printed pattern from the blind loss, from film processing and printing in the aniline printing machine production line be completed within the polyvinylidene chloride coating process. Thus, in a production line can produce a printed within the packaging film. In order to improve composite fastness,[link widoczny dla zalogowanych], monitoring of certain films have a certain wetting, but also to improve the moisture resistance of composite films, usually in the coating of polyvinylidene chloride before the end of plastic coated with a layer of basement membrane for the corona, or treatment. PVDC coating is the improved device for gravure printing (Fig. ,[link widoczny dla zalogowanych], the coating roller speed can change. In order to change the amount of coating required, generally dry coating material is 4 to 6 g / m. Of course, followed by the drying device is also important, for it to provide the required coating dispersant Xin drying temperature, usually 100-120 ℃, oven length of about l microphones, so the production rate can reach 180 - ~ / min or so. (3) The whole surface of hot melt adhesive hot-melt coating technology Jiao (usually a vinyl acetate ethylene copolymers and other organic modified waxes) are mainly used as a sealing layer of packaging film, such as cellophane, polypropylene, polyethylene and other plastic adhesive tape; also be used as protective coating materials and high-light layer. Hot melt adhesive coating can be coated in a special device or improved gravure printing device to complete. Figure 9 is a diagram of hot-melt Jiao spreader. All of the roller and the coating bath, the width of the entire device must be heated evenly, the roller must fastness, speed error is very small. And in order to achieve the required relative speed, the roller will be driven, so that the necessary and uniform coating can be coated layer thickness,[link widoczny dla zalogowanych], and even high-viscosity hot melt coating, they can reach this purposes. Coated device design essentials are: spreader beam bending can not occur, and the coating weight should be easy to adjust; in the use of devices for hot-melt gravure Jiao coating, roller coating must be heated, and use the double wall of coating bath can be heated. In the high viscosity hot melt coating, the coating device should also heated, coated device in the back,[link widoczny dla zalogowanych], to be installed with a certain cooling capacity of the cooling roller to melt Jiao Ling is so smooth solidification and to obtain high surface. High viscosity hot melt coating is sometimes carried out through the nozzle,[link widoczny dla zalogowanych], if the technology can be further promoted, then, Jiao hot melt coating applications in the packaging industry more certainly arouse people's interest. Nozzle coated with a thin and uniform coating method can meet the required high viscosity hot melt adhesive layer and, consequently, can produce high-quality products and pass savings melt Jiao, and reduce the cost of the final product . (4) or aluminum metallized film technology in recent years, with a high vacuum evaporation of metal-coated (or aluminum) into the legal system the growing use of packaging films. Currently, the packaging of aluminum packaging film has been applied are: aluminum BOPP film, aluminum film polyamide, polyester, aluminum film, polyethylene film and aluminum in which the central aluminum composite film. The application of doubled aluminum film the main reason is that it has good optical properties, excellent light and heat reflective, and has a very high water vapor and oxygen barrier odor absorption. Its varieties, there are aluminum film and strip the entire surface of two aluminum films, in most cases, the aluminum film machine maple performance very good, and the secondary processing of products and practical performance is also bad news. Crease of pure aluminum foil common phenomenon no longer exists. The so-called vacuum coating technology, in fact, the film and the metal layer of uniform coating to a variety of high quality thin films of an economic and practical secondary processing technology. The mechanism is: as the density of the material can be evaporated to be very small, so as to be coated with the thinnest slice thickness: it is a lower melting temperature under vacuum. In high vacuum, to change its physical state can be material to pass, and will not mix with other materials or reaction. Aluminum thin film process technology, packaging is as follows: in a high vacuum evaporation equipment, and rolls cooled by a large roll unwinding, and to 3O ~ 4 microphone / min roll speed to the rolling direction. Here in the cooling roller, a number of evaporation sources, and 1700 ℃ high temperature evaporation of aluminum. Fine metal particles in the packaging film that is deposited on the surface and fixed. Then the rolls are finished by cooling prison. Aluminum film processing width stern a l6oO 0 mm, single-sided aluminum can also double-sided aluminum, aluminum's thickness is 0. Ol ~ 0. O5 microns. Aluminized plastic film for food packaging and other areas have a wide range of applications, packages will be more attractive through the aluminum. Capacity due to increased light resistance, the phenomenon of bleaching and reduced running taste, the contents of the storage period is also extended. ■ China Packaging dependents in 1989, 9 1 / 59

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