Antifog thin film for food packaging

Abstract

The invention provides an antifogging film used for food package, which is characterized in that the antifogging film adopts an internal addition type production mode to directly add a migration type antifogging agent into a raw material resin during preparing. The antifogging film forms a three-layer structure by a production mode of co-extrusion molding, wherein the three-layer structure uses a transparent film layer as an intermediate layer, and sets an inside antifogging layer and an outside antifogging layer inside and outside the intermediate layer; and the inside antifogging layer and the outside antifogging layer both use ethylene-propylene binary copolymerized polypropylene or ethylene-propylene-butylene ternary polymerized polypropylene as materials, and are added with the migration type antifogging agent. The antifogging film has bilateral antifogging function with strong durability of antifogging effect, and can not be easily washed away or erased.

Description

technical field [0001] The present invention relates to film, more specifically relates to a biaxially stretched polypropylene film with anti-fog function as food packaging. Background technique [0002] Anti-fog film is a functional film that prevents water vapor from forming fog on the surface of the film and affecting transparency. BOPP biaxially oriented polypropylene anti-fog film will not form mist due to the evaporation of water on the surface of the film under high and low temperature changes. It is mainly used for packaging of fresh fruits, vegetables, salads, edible fungi, etc. Due to the large water content of fresh products, the temperature changes greatly during storage, transportation and sales, and a layer of opaque water mist is generated on the inner layer of the packaging bag, so that users cannot see the products in the bag. The goods in the bag are prone to deterioration and corruption after contact with water mist, which rapidly shortens the shelf life ...

AI Technical Summary

Problems solved by technology

[0004] 1. Its single-side anti-fog performance cannot meet the requirements of use. In some occasions, it needs to have double-side anti-fog function.

[0005] 2. The form of external coating is adopted, that is, after the anti-fogging agent is dissolved in organic solvent or water, it is applied to the surface of the plastic film. Although the method is simple and low-cost, the anti-fogging effect has poor durability and is easy to be washed off or wiped. Lose