1, bag processing requires two kinds of printing equipment, divided into ordinary gravure printing machine and letterpress printing machine. Food packaging bags of printing equipment are using gravure high-speed printing machine mostly, the printing equipment has a high degree of precision, fast printing speed, printing stability and other characteristics, in the domestic printing equipment belongs to the high-end.
2, bag processing needs slitting machine, also known as slitting machine, is to do the necessary equipment for food automatic film rolling, computerized automatic slitting machine maximum slitting speed can reach 300 meters per minute, in the same industry slitting machine equipment belongs to the leading level.
Good slitting machine with a good master slitting out of the roll of film specifications accurate and high flatness. In the automatic packaging machine can be used stably, there will be no film jam, film breakage and other phenomena.
3, bag-making machine is the last process of the food bag production process by the equipment. According to the bag of different bag shapes using different bag-making machine. Such as the production of three-sided sealing of the vacuum bag on the use of three-sided sealing of the heavy pressure type of bag-making machine, do stand-up pouches and zipper bags, we need to use the zipper bag-making machine. Do center front bags, tea bags, etc. on the use of medium seal bag making machine.
4, dry laminating machine is through the dry laminating process will be different plastic films glued together to form a composite film machine. Dry laminating process, that is, after the glue will be coated with the solvent in the glue by heating exhaust method to make it fully dry, and then in the "dry" condition for composite. In view of the dry laminator will be different plastic film, aluminum foil and even paper for laminating, so the dry laminator requirements are higher.
5, the liquid plastic sprayed out, the use of the machine blowing out the wind, the plastic body will be blown attached to a certain shape of the mold cavity, so as to make products, this machine is called blow molding machine.
Production is mainly polyethylene (PE), domestic production is mainly polypropylene (PP). Polyethylene is a thermoplastic resin produced by polymerization of ethylene. In industry, also includes ethylene and a small amount of α-olefin **** polymer.
Polyethylene odorless, non-toxic, feel like wax, has excellent low-temperature resistance (the lowest use temperature up to -70 ~ -100 ℃), good chemical stability, can resist the erosion of most acids and alkalis (not resistant to oxidizing properties of the acid), insoluble in general solvents at room temperature, water absorption is small, excellent electrical insulation properties; but polyethylene for the environmental stresses (chemical and mechanical effects) is very sensitive. Heat aging resistance is poor.
The nature of polyethylene varies from species to species, mainly depending on the molecular structure and density. The use of different production methods can be obtained with different densities (0.91 ~ 0.96g/cm3) of the product. Polyethylene can be processed by general thermoplastic molding methods.
Wide range of uses, mainly used in the manufacture of film, containers, pipes, monofilament, wire and cable, daily necessities, etc., and can be used as a high-frequency television, radar and other insulating materials.