Puncture-resistant heavy packaging composite film and preparation thereof

Abstract

A heavy packaging composite film is characterized by comprising an outer layer, a core layer and an inner layer. The formula of components of the heavy packaging composite film by weight includes that the ratio of the outer layer to the core layer to the inner layer is 5-20wt%:60-90wt%:5-20wt%, preferably, the ratio is 5-10wt%:80-90wt%:5-10wt%, and more preferably, the ratio is 10wt%:80wt%:10wt%.The outer layer is made of metallocene linear polyethylene and low-density polyethylene, the core layer is made of EVA (ethylene vinyl acetate) and low-density polyethylene, and the inner layer is made of medium-density polyethylene and low-density polyethylene. By means of coordination of the metallocene linear polyethylene of the outer layer, the EVA of the core layer and the low-density polyethylene of the inner layer, the three-layer heavy packaging composite film is ensured to simultaneously have better puncture resistance and tensile strength.

Description

technical field [0001] The application relates to a heavy packaging film and a manufacturing method thereof, belonging to the technical field of processing and application of packaging plastic raw materials. Background technique [0002] Traditional polyethylene, polypropylene, polystyrene and other resin pellets are packaged using paper composite woven bags with an opening at the top. Due to many procedures and complicated packaging, the packaging capacity of a single packaging line is greatly limited. It can only be applied to synthetic resin pellet production lines with an annual output of less than 100,000 tons. The heavy-duty packaging film products matched with the automatic packaging line of large-scale synthetic resin products widely adopt continuous blown film for one-time "Form-Fill-Seal (FFS)" bags. A new type of heavy packaging film product that has just been developed in recent years. During the packaging operation, multiple processes and the operation process...

AI Technical Summary

Problems solved by technology

However, in practical application, the product quality index has not formed a unified national standard, and the product formula is not mature, and is still in the process of continuous improvement and perfection, which directly leads to large fluctuations in the quality of the product, especially the tensile strength and The puncture resistance is very unstable, and various accidents such as package rupture and insufficient heat-sealing strength often occur, which seriously affect the normal production of the automatic packaging line

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