Vacuum bag, also known as polyamide 66 (polyamide 66) or nylon 66 (nylon 66). Yellowish translucent or opaque opaque resin. The relative density of 1.14 ~ 1.15, the melting point of 259 ~ 267 ℃. Wear, oil, excellent self-lubricating, heat resistance, strength, rigidity is the highest varieties of aliphatic nylon. Tensile strength of 75.9 ~ 82.9MPa, compression strength of 91MPa, cantilever impact strength (notch) 4kJ / m, heat distortion temperature (1.82MPa) 75 ℃, hardness R120, volume resistivity 1015Ω · cm, dielectric strength 35kV / Selfishness. By adipic acid and hexamethylenediamine polycondensation reaction in the system. Can be extruded, injection molding, blow molding and other methods of forming processing. Can be enhanced, filled, alloy modified.
Vacuum bags, also known as vacuum packaging, is based on the principle of atmospheric pressure, vacuum bag is the main role in the oxygen, in order to help prevent food rotten deterioration. Vacuum packaging is the packaging bags and food cells within the oxygen with the exhaust pump, so that microbial loss of "living environment" process. Vacuum bags can also prevent the oxidation of food, so that food does not taste, deterioration of vitamin A and C to reduce the loss.
Vacuum packaging materials commonly used double composite film or three thin aluminum composite film made of three sealed bags. Vacuum packaging machine commonly used cavity and outside pumping two models. China's vacuum packaging technology was developed in the early eighties, and vacuum inflatable packaging technology in the early nineties began to use.
Vacuum inflatable packaging is in the extraction of vacuum, and then filled with nitrogen, carbon dioxide and other gases. Nitrogen is an inert gas, from the filling effect, so that the vacuum bag to maintain a positive pressure to prevent the bag outside the air into the bag, the food play a protective role. Carbon dioxide has a role in inhibiting the activity of microorganisms such as molds and spoilage bacteria. Some cases such as crispy fragile food, easy to change the oil products, sharp edges and corners or higher hardness will pierce the vacuum bag and other food, vacuum inflatable packaging, vacuum bag inflatable pressure greater than the pressure outside the bag, can effectively To prevent food compression crushing, deformation, and does not affect the appearance of the bag and printing and decorating. With the promotion of small bags of vacuum bags and the development of supermarkets, its scope of application will be more and more extensive, and some will gradually replace the hard packaging.
Vacuum deaerator In addition to inhibiting the growth and reproduction of microorganisms, another important function is to prevent the oxidation of food, because the fat food contains a large number of unsaturated fatty acids, the role of oxygen and oxidation, so that food taste, deterioration. In addition, the oxidation also makes vitamin A and vitamin C loss, food pigment in the unstable material by the role of oxygen, so that the color darkens. Therefore, the oxygen can effectively prevent food deterioration, to maintain its color, smell, taste and nutritional value.