High temperature cooking bags commonly used classification base material and structure

High temperature cooking bags commonly used base material and structure classification most enterprises in the market now to print the high temperature cooking bags, most of the printing substrate used for PET, NY for printed material, the middle layer, most of the aluminum foil and the inner heat sealing layer is made of stretch film CPP or PE film boiling resistance, etc. The PET to finalize the design is good, good frost resistance heat resistance; NY is moisture resistance is poor, easy to absorb the moisture. Aluminum foil is RuanSu packaging industry important base material, through high temperature rolling together, has a silver sheen. RuanSu packaging used on the aluminum foil is 9 to 15 microns, rolling, winding should not use too much tension, tension is easy to tear, aluminum foil is unfavorable excessive guide roll by, easy to crack due to folding, good barrier property, aluminum foil has good thermal conductivity, electrical conductivity, has been widely used in flexible packaging, in the high temperature cooking bags, materials used aluminum foil as the middle layer can improve the heat transfer speed, temperature uniformity in cooking bags of food. Aluminum foil good barrier property, surface should not have oil, in printing or compound best pretreatment before, make the surface tension of the desired requirement and can significantly improve the printing fastness and aluminum foil composite fastness. And extrusion flow delay commonly used for lining use CPP enhanced membrane, cast CPP good barrier property, high temperature resistant, resistant to boil, at the same time is good to acid alkali, heat shrink, excellent heat sealing strength, can reach 121 ℃ for 30 min sterilization processing, when under 100 ℃ for 30 min, you can use the LDPE, LLDPE, EVA, mPE heat sealing materials, etc.