PA, PET material vacuum packaging performance contrast

PET material vacuum bags colorless, transparent and glossy. Commonly used for cooking the outer layer of the packaging materials, printing is better. PA material vacuum packaging good transparency, suitable for oily food, meat, Fried food, vacuum packing food, cooking food, etc. PET vacuum packaging materials, PET or polyethylene terephthalate, colorless has certain luster transparent material ( No qualitative) , or opaque milk white matter ( Crystal type) 。 Difficult to ignition and combustion, but once after burning, the flame away from the, still can continue to burn, combustion would melt, burst into pieces, flame, yellow, blue edge early, have a small drop, black smoke, slightly sweet, excitative smell of orogenic belts. Pure PET performance is poor, especially the impact strength and heat resistance is poor, but after glass fiber enhancement, various performance greatly improved. PE vacuum packaging material, namely polyethylene PE, non-toxic, tasteless, white. The density of 0. 91-0. 96 g/cm3 to crystalline plastics. Polyethylene has certain mechanical strength, but compared with other plastic its low mechanical strength, surface hardness. Polyethylene insulation performance, room temperature does not dissolve in any known solvents, and resistant to dilute sulfuric acid, concentration of dilute nitric acid and any other acid and various concentration of alkali and salt solution. Polyethylene has a high degree of water resistance, long-term contact with water and its performance can remain the same. Polyethylene gas permeable performance is poorer, and through the oxygen and carbon dioxide, as well as many organic matter steam performance is good. Polyethylene under the action of heat, light, oxygen aging and brittle. Generally the use of high pressure polyethylene around the temperature of 800 ℃, low pressure polyethylene is about 1000 ℃. Polyethylene can hardy, in - 600 ℃ still has good mechanical properties, - 700 ℃ still has certain flexibility. PET vacuum packaging machine, therefore, high performance, high rigidity, hardness and toughness, with durable thorn, friction resistance, high temperature and low temperature resistance, chemical resistance, oil resistance, air tightness and sweet good characteristic, but PA vacuum packing bag with good gloss, high tensile strength, tensile strength, but also has good heat resistance, cold resistance, oil resistance and organic solvent resistance, abrasion resistance, durable sex good, and is soft, the characteristics of good resistance of oxygen resistance, contrast, PA material than PET material in intensity, durable thorn sex is somewhat higher, but PA material vacuum bag is a little higher than PET material vacuum bag market prices.