Method for manufacturing laminated packaging material
A packaging material and extrusion lamination technology, which is applied in the field of manufacturing laminated packaging materials for packaging liquid food, can solve the problems of raw material waste, energy waste, etc., and achieve reduced necking, high pass rate, and sealing strength Good results
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[0028] Such as figure 2 As shown, a laminated packaging material manufactured by the method of the present invention includes the outermost layer of thermoplastic material 21, the core layer 22, the intermediate layer of thermoplastic material 23, the barrier layer 24, the adhesive layer 25 and the innermost layer of thermoplastic material in order from the outside to the inside. Layer 26.
[0029] The outermost layer 21 of the thermoplastic material contains linear low density polyethylene (MLLDPE) polymerized with a metallocene catalyst and low density polyethylene (LDPE), wherein the linear low density polyethylene (mLLDPE) polymerized with a metallocene catalyst has the following parameters: average density 0.88g / cm 3 ~0.925g / cm 3 , Melt flow index (190℃, 2.16kg) is 5g / 10min~20g / 10min, peak melting point is 85℃~130℃, expansion ratio is 1.2~1.8; low density polyethylene (LDPE) has the following parameters: average density 0.90g / cm 3 ~0.925g / cm 3 , Melt flow index (190℃, 2.16...
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