Packaging film, film bag, and method for manufacturing same

Abstract

Provided is a packaging film that is capable of suppressing the leaching of additives such as antioxidants from a package-contents-contacting inner layer, has superior transparency and mechanical strength, has a level of oxygen permeability low enough to prevent the permeation of ambient oxygen, and can be rapidly manufactured. The packaging film 1 comprises a package-contents-contacting inner layer 10, a first adhesive layer 20, a gas barrier layer 30, a second adhesive layer 40, and an outer layer 50 layered in that order. The inner layer 10 contains more than 40 mass% and no more than 90 mass% linear low-density polyethylene, as well as low-density polyethylene and / or high-density polyethylene; does not contain any leachable components; and has a density and thickness of at least 0.920 g / cm<3> and 50 [mu]m, respectively. The first adhesive layer 20 and the second adhesive layer 40 contain antioxidants 21, 41. The thicknesses of the first adhesive layer 20, the gas barrier layer 30, and the second adhesive layer 40 are less than 30 [mu]m.

Description

technical field [0001] The present invention relates to a film for packaging liquid or solid food, medicine, machinery and machine parts, a film bag using the same, and a manufacturing method thereof. Background technique [0002] Film bags made of film for packaging food and pharmaceuticals. The packaging film that forms the film bag has gas barrier properties that do not allow oxygen in the air to permeate, so that the food to be packaged will not be oxidized or polluted; it has low exudation, and the components contained in the film will not leak from The surface of the film oozes and adheres or dissolves to the packaged product; and it is required to have high strength, and it will not be damaged even if the pressure inside the film bag increases due to external force. In order to meet these demands, packaging films have a multilayer structure in which various films are laminated. [0003] Among such packaging films, the cleanliness of the inner layer film which is in ...

AI Technical Summary

Problems solved by technology

[0006] However, even if the anti-oxidant-containing resin is disposed in the middle layer as in the film bag of Patent Document 1, the antioxidant will gradually migrate to the inner layer made of LDPE with low crystallinity, seep out of its surface, and even adhere to the inner layer. Or dissolve into the packaged product, so the contamination of the packaged product cannot be completely prevented

[0007] On the other hand, the inner layer of the film bag made of LLDPE, because the shear heat generated by LLDPE is high, it is easy to become overheated when the film bag is manufactured. cosmetic defects, and it is difficult to efficiently manufacture film bags

Images