Heat shrinkable film and preparation method and application thereof

Abstract

The invention provides a high-performance heat shrinkable film which has the advantages of low shrinkage temperature, high shrinkage speed, low water vapor transmission rate, high transparency and thelike. The heat shrinkable film is prepared by adopting a three-layer co-extrusion film blowing method and comprises an outer layer, a middle layer and an inner layer. The mass ratio of the outer layer to the middle layer to the inner layer is (1-3): (1-3): (1-3); the outer layer comprises high-pressure low-density polyethylene, an ethylene-vinyl acetate copolymer, an anti-sticking master batch, asmooth master batch and an antistatic master batch; the middle layer comprises an ethylene-vinyl acetate copolymer and a propenyl elastomer; and the inner layer comprises high-pressure low-density polyethylene, metallocene low-density polyethylene, a propenyl elastomer, an anti-sticking master batch, a smooth master batch and an antistatic master batch. According to the heat shrinkable film, thetensile strength and the elasticity modulus are improved and the bag breaking rate is effectively reduced; the heat shrinkage rate reaches up to 75% after treatment at 130 DEG C for 20 seconds, the light transmittance is greater than 90% and the haze and glossiness are greatly improved.

Description

technical field [0001] The invention belongs to the technical field of polymer materials for packaging, and relates to a heat-shrinkable film, in particular to a heat-shrinkable film with good shrinkage efficiency and high transparency, a preparation method and an application thereof. Background technique [0002] With the increase of national environmental protection and energy saving efforts, some products packed in cartons are increasingly replaced by plastic packaging, and the increase in the consumption of plastic packaging products will definitely promote the technological progress and rapid development of the plastic packaging machinery industry. The economic macro and micro conditions are getting better, and social demand will show a steady growth, which is expected to stimulate the growth of plastic product consumption. In order to meet the requirements of the new era, plastic packaging materials are also required to meet the increasing packaging quality and efficie...

AI Technical Summary

Problems solved by technology

However, there are still many problems in the use of these two types of shrink films. For example, POF shrink film has poor toughness and is easy to break the package; ordinary PE shrink film has high shrinkage temperature, slow shrinkage speed, and low efficiency. If the outer layer of the package is PE The film is easy to melt and stick when passing through the drying tunnel, and its transparency is poor. It is impossible to scan and identify the packaged product label. It needs to be labeled on the outside of the film, which increases the process and reduces the efficiency.

Images