The characteristics and application of the packaging bag material

　　For the packaging materials have many, such as PE, LDPE, PET, OPP, PVC, AL, PT and so on, but these materials have their own shortcomings, can not alone as the nozzle bag material. Characteristics of specializing in the production of flat bag, nozzle bag, liquid packaging bag manufacturers to share all kinds of information and its use.

　　LDPE film density is about 0.92g/cm3, thickness is usually in the 20-100 m （micron）， is a flexible, transparent, non-toxic, odorless, thin film. Excellent water resistance, moisture resistance, heat sealing, cold resistance and chemical stability, in accordance with the film technology is not the same as IPE, CPE, low foaming film, IPE film and the opening of the tensile strength than CPE film, a positive print, can be used as a food bag, garment bag etc.; CPE the film thickness uniformity, surface gloss, transparency and thermal sealing property is better than PE, can be positive and negative print, but its high cost, CPE film mainly used for composite bag, cosmetics, pickles and inner layer cake packaging; low foaming film decoration is good, solid texture, is not easy to stretch deformation, the positive print, as New Year paintings, trademark and hand bag etc LDPE is widely used in food packaging, pharmaceutical packaging, daily necessities packaging and metal products, packaging, but because the LDPE permeability of film, no fragrance, oil resistance of defects such as oxidation of tea, food, oil and food packaging is not appropriate. Use LDPE membrane permeability of can in other areas, such as in fruit, vegetables and other aspects.

　　PE is also known as polyethylene, ethylene polymerization is made of thermoplastic resin, PE thin film is the use of plastic film is the largest （about the total amount of more than 40%）。 PE thin film is non-toxic, odorless, feel like wax, with good low temperature resistance, together with good chemical stability, erosion resistance to most of the acid and alkali, insoluble in common volume at normal temperature, water absorption of small, good electrical insulation function. Although the appearance of the above is not very ideal, but because of its resistance, moisture resistance, heat sealing function is good, and the processing is convenient, the price is cheap, and used widely. According to the method of making PE thin films and the manipulation is not the same, can be made of low density polyethylene （LDPE）， medium density polyethylene （MDPE）， high density polyethylene （HDPE）， crosslinked polyethylene （CLPE） and other different functions of goods.