Polyester film for shrinkable cigarette pack

Abstract

The invention discloses a contracting type polyester film for packing cigarettes, which comprises three layered structures. The main composition of the upper surface layer of the layered structure is copolycondensation modified polyester; the main composition of the core layer of the layered structure is polyethylene glycol terephthalate; the main composition of the lower surface layer of the layered structure is copolycondensation modified polyester; the upper surface layer, the core layer and the lower surface layer are directly co-extruded and compounded. The polyester film has good fragrance protectiveness, and solves the problem that the BOPP cigarette film is not wear-resistant. Simultaneously, due to the high stiffness of the polyester film, a plurality of C5 or C9 petroresins is not required to be added as the stiffening agent in the core layer as the high contracting type cigarette film, therefore, the cost of the polyester film is nearly identical to that of the BOPP cigarette film, and the polyester film is particularly suitable for packing the cigarettes with stiff casement.

Description

technical field [0001] The invention relates to the technical field of polyester films, in particular to a polyester film suitable for hard cigarette packaging. Background technique [0002] Cigarette packaging film is referred to as cigarette film. At present, small packs of hard-pack cigarettes on the market mainly use high-shrinkage biaxially oriented polypropylene film (referred to as BOPP cigarette film) with a thickness of 20-22um. It has low heat-sealing temperature, uniform shrinkage, Excellent smoothness, good optical performance, etc. meet the requirements of good running performance and appearance required in the cigarette packaging process. [0003] However, the BOPP cigarette film whose core layer is mainly composed of polypropylene material and whose surface layer is mainly composed of ternary or binary random copolymerized polypropylene copolymer, due to the limitation of the properties of the main raw material, its gas barrier performance (flavor retention) ...

AI Technical Summary

Problems solved by technology

[0003] However, the BOPP cigarette film whose core layer is mainly composed of polypropylene material and whose surface layer is mainly composed of ternary or binary random copolymerized polypropylene copolymer, due to the limitation of the properties of the main raw material, its gas barrier performance (flavor retention) properties), the surface gloss is not ideal, and the glass transition temperature of the surface material is lower than normal temperature, which makes it easy to be scratched during transportation and circulation, and even white and foggy in serious cases, resulting in unclear cigarette label patterns , The color is dull, this phenomenon is called grinding phenomenon

[0004] Especially in today's situation where tobacco products are generally not allowed to advertise and marketing restrictions are increasing, BOPP cigarette film can no longer meet the needs of cigarette packaging

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