Linear easy-to-tear composite film or bag

Abstract

The invention discloses a linear easy-to-tear composite film, which comprises inner layers and an outer layer from inside to outside, wherein the outer layer is made from PET (polyethylene glycol terephthalate) plastic; the inner layers are an inner layer A and an inner layer B; the inner layer A is made from a blend of a cycloolefin copolymer B and polyvinyl at the mass ratio of (1-4.2):(1-4.8);the inner layer B is made from a blend of a cycloolefin copolymer A and an ethylene-vinyl acetate copolymer at the mass ratio of (1-9.5):(1-10.5); the cycloolefin copolymer A is prepared by copolymerizing ethylene and 51-55% of norbornene by mole percent; and the cycloolefin copolymer B is prepared by copolymerizing ethylene and 30-34% of norbornene by mole percent. The linear easy-tear type composite film has the benefits of good linear tearing property, good strength, good rigidity, excellent transparency, good heat resistance, excellent drug resistance and hydrolysis resistance, excellent environmental performance, uniform thickness and high cost performance.

Description

technical field [0001] The invention relates to a packaging film and a bag, a packaging film and a bag in the field of medical packaging, and more specifically relates to a linear easy-to-tear composite film and bag. [0002] Background technique [0003] With the development of science and technology and the improvement of living standards, people put forward various new requirements for packaging materials. In the field of medical packaging, large packaging bags first need to have good strength, not easy to break the bag, and prevent the internal medical products from being polluted by the external bacterial environment. At the same time, it is also required to be easy to tear to ensure the use. convenient. [0004] At present, in order to make the film constituting the bag tearable, especially straight-line cutting, many schemes have been proposed: [0005] For example: Japanese Patent Publication No. 58-38302 discloses a laminated film with a uniaxially stretched film...

AI Technical Summary

Problems solved by technology

Although the straight-line easy-tear film disclosed in this document is excellent, due to the limitation of its substrate, it cannot meet the requirements of larger medical packaging bags in terms of strength.

[0006] Another example: the Chinese invention patent with the publication number CN102502069A discloses an easy-to-tear composite packaging film. The packaging film is punched with destructive scores on the packaging film by a die-cutting method to achieve straight-line easy tearing, but due to It does not improve the internal raw materials and composition of the packaging film (bag), but only improves the structure and processing method, so its straight-line tearability is not as good as it describes. In fact, due to the limitation of the packaging film material, and Cannot fully achieve the controllability of straight line tear marks