2024-06-17
The sales packaging and transportation packaging of clothing packaging need to use plastic film or pure aluminum bag, and the plastic film is usually used on the fabric transportation packaging for moisture-proof. On the one hand, it is moisture-proof and anti-fouling, and the other force surface plays a decorative role. Plastic materials have become the most common packaging materials used in textile packaging, and the main forms are plastic film and plastic bags. The main components of pure aluminum bags are polyethylene, polypropylene, polyvinyl chloride and so on.
1. Polyethylene
Non-toxic and odorless, polyethylene is a thermoplastic resin prepared by addition polymerization of ethylene. Polyethylene is a reddish particle or powder. Translucent. Good chemical stability, acid and alkali corrosion resistance. According to different polymerization conditions, polyethylene with relative molecular weight ranging from ten thousand to several million can be obtained. Commercially, polyethylene is divided into low density polyethylene (LDPE) and high density polyethylene (HDPE). Generally used for packaging is mainly without plasticizer low density polyethylene (o.92o.93Rcm Low density polyethylene density range of o.910o.925gcmz molecular structure for the chain with long and short different branch chains of the chain type molecules. For every 1000 carbon atoms on the pyramid, there are about 10 large chains of ethyl, butyl or longer. Compared with high density and medium density polyethylene. It has a low crystallinity (55%). 65%) Low softening point (108126Y) and wide melt index (o.280g10mn) Low density polyethylene has good flexability, extensibility and transparency, but the mechanical strength is lower than high density polyethylene linear low density polyethylene. Low density polyethylene is mainly used in the manufacture of thin films. Film products account for about half of the total output of low-density polyethylene products, which is used for agricultural film and various food, textile and industrial packaging.
Ii. Polypropylene
Polypropylene main chain with a total side chain. If the pure aluminum bag is all distributed on one side, it is called isotactic polypropylene; If methyl groups are regularly distributed in the main chain, the relative molecular weight of polypropylene is between 80,000 and 200,000. It is called questioning polypropylene; If methyl groups are particularly regularly distributed on the main chain, it is called random polypropylene. Polypropylene is usually translucent homogeneity, odorless death poison, density (o.90o.91g mechanical strength is higher than polyethylene, good heat resistance in three polypropylene. The isotactic polypropylene was obtained by hydrogenation of saturated gasoline and polymerization of propylene by using dichloride drill monochloride diethyl aluminum as catalyst.
Polypropylene plastic dress is mainly used for packaging textiles, knitwear, clothing, shirts and so on.
3. Polyvinyl chloride
With a relative molecular mass of 50,000-120,000, polyvinyl chloride is a red powder that is too toxic and auro-free. Polyvinyl chloride is a polymer formed by free group addition polymerization, belonging to thermoplastic resin. There is no fixed melting point and the density is (1.35145 gcm), which has the chemical stability of the lamp. It is soluble in cycloacetone, chlorobenzene, dimesyl methylcoolamine, toluene - acetone and other mixed solvents. The chemical properties of polyvinyl chloride depend on the molecular weight of the polymer and the content of plasticizer and filler. The plasticizer content in 100 parts of PVC resin is greater than 25 parts, it becomes a soft plastic, the elongation increases, but the tensile strength, stiffness, hardness and other mechanical properties are reduced; Polyvinyl chloride is an indeterminable polymer, the glass transition temperature is about 80℃, this temperature begins to soften, with the increase of temperature, mechanical parts gradually lose energy. In practical applications, the temporary use of PVC temperature skin should not exceed 65 homes. The thermal stability of PVC is poor, and the pure aluminum bag can cause discoloration when it is heated or exposed to sunlight, from yellow, school color, brown to black, and with the reduction of mechanical and chemical properties.
Manufacturing packaging film, shrinkable film, composite film and transparent sheet, polyvinyl chloride is widely used than tough. Packaging information. Containers can also be made using transcontainer and packaging coating. The plastic bags made with it are mainly used in gift bags, bags, needle-cotton bags, cosmetic bags, file bags, information bags and so on.