Laminated package material

Abstract

The invention provides a lamination packaging material which comprises an outermost thermoplastic material layer, a core layer, an intermediate thermoplastic material layer, a barrier layer, an adhesive layer and an innermost thermoplastic material layer from outside to inside, wherein the adhesive layer comprises metalloscene catalyst polymerized linear low-density polyethylene (MLLDPE) and low-density polyethylene (LDPE), wherein the mLLDPE has the following parameters: the average density is 0.88g / cm<3>-0.925g / cm<3>, the melt index (190 DEG C, 2.16kg) is 5g / 10min-20g / 10min, the peak melting point is 85 DEG C-130DEG C, and the expansion ratio is 1.2-1.8; and the LDPE has the following parameters: the average density is 0.90g / cm<3>-0.925g / cm<3>, the melt index (190 DEG C, 2.16kg) is 5g / 10min-20g / 10min, the peak melting point is 85 DEG C-110DEG C, and the expansion ratio is 1.2-1.8. During the process for manufacturing a packaging container by using the lamination packaging material provided by the invention, a longitudinal sealing part can be subjected to heat sealing rapidly, so as to obtain the packaging container with good sealing intensity, and the manufactured container has high yield and long durability time for liquid food.

Description

[0001] The patent application of the present invention is a divisional application based on the patent application for a laminated packaging material filed by the applicant for the first time. The filing date of the original application is December 31, 2012, and the application number is 201210593137.3. technical field [0002] The invention relates to a laminated packaging material, in particular to a laminated packaging material for packaging liquid food. Background technique [0003] At present, disposable disposable packaging containers for liquid food have shapes such as bricks, squares, triangles, octahedrons with hexagonal cross-sections, and pillows. Usually, the laminated packaging materials used to manufacture these packaging containers include sequential layers. The outermost layer of thermoplastic material, the core layer, the middle layer of thermoplastic material, the barrier layer, the adhesive layer and the innermost layer of thermoplastic material, and there ...

AI Technical Summary

Problems solved by technology

All three solutions require the extruder die to be much wider than the width of the paper substrate and barrier layers, requiring more heat to heat and melt the thermoplastic material, wasting energy, and cutting off after lamination is complete Defects on both sides of packaging materials, resulting in waste of raw materials

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