Independence yin and foil bags Main products: aluminum foil bag, vacuum bag, shielding bags, vacuum bags circuit boards, cooking food vacuum bag, nylon vacuum bag, anti-static bags and other packaging materials metal. Vacuum known as polyamide 66 (polyamide 66) or nylon 66 (nylon 66). Yellowish translucent or milky white opaque resin. The relative density of 1.14 to 1.15, the melting point of 259 ~ 267 ℃. Abrasion resistance, oil resistance, excellent self-lubricating property, heat resistance, strength, rigidity is the highest in the aliphatic nylon varieties. Tensile strength 75.9 ~ 82.9MPa, compressive strength 91MPa, Izod impact strength (notched) 4kJ / m, heat distortion temperature (1.82MPa) 75 ℃, hardness R Mask 0, the volume resistivity of 1015Ω? Cm, the dielectric strength of 35kV / mm, self-extinguishing. From adipic acid and hexamethylene diamine condensation reaction. The extrusion, injection molding, blow molding and other methods. Can enhance, filling, alloy modification. General storage requirements of direct sunlight and away from sources of ignition save, at 25 degrees Celsius can be stored for 2 years. Also known as vacuum packaging vacuum packaging, is based on the principle of atmospheric pressure, the main role of the vacuum bag is oxygen, in order to help prevent food spoilage or deterioration. Vacuum packaging is to food packaging bag and oxygen within the cell by pumping deprived, so that microbial processes in the loss of "living environment". Vacuum food can prevent oxidation, the food does not taste, deterioration reduce the loss of vitamin A and C. Vacuum packaging materials commonly used three-layer composite film or aluminum foil composite film made three sealed bags. Vacuum packing machines commonly used outside pumping cavity and two kinds of models. Our vacuum packaging technology was developed in the early 1980s, while filling the vacuum packaging technology started in the early nineties. Filling the vacuum packaging is after vacuum evacuation, and then filled with nitrogen, carbon dioxide and other gases. Nitrogen is an inert gas, from the filling, so that the vacuum bag to maintain a positive pressure to prevent outside air from entering the bag bag, food plays a protective role. Carbon dioxide inhibit mold, bacteria and other microorganisms an active role. Some, such as crispy or crunchy foods, food deformation take the oil, sharp edges or high hardness will pierce the vacuum bag and other food, after filling the vacuum packaging, vacuum bag inflatable bag outside pressure greater than atmospheric pressure, and can effectively prevent food crushing compression, distortion, and does not affect the appearance of bags and printing and decorating. With the promotion and development of small supermarkets vacuum packaging, and its scope will be more extensive, some will gradually replace the rigid packaging.