BOPP thin film of hard-box cigarette package special for super-high speed cigarette packer

Abstract

The invention discloses a biaxially-oriented polypropylene (BOPP) thin film of a hard-box cigarette package special for a super-high speed cigarette packer. The thin film adopts a way of directly co-extruding and compositing a three-layer structure, wherein the upper surface structure of the thin film is mainly made from polypropylene copolymer; the core structure of the thin film is mainly made from polypropylene homopolymer; and the lower surface structure of the thin film is mainly made from polypropylene copolymer. In the BOPP thin film disclosed by the invention, excellent optical performance, smoothness and thermal shrinkage are kept; the stiffness is good; the elastic modulus is high; the thickness is uniform; the surface of the film has certain wear resisting property; and the film can be applicable to a super-high speed cigarette packer set and effectively solves the technical problem that an ordinary hard-box cigarette package thin film cannot be matched with the packer set to be used.

Description

technical field [0001] The invention relates to a BOPP film used for packaging hard-case cigarettes specially used for an ultra-high-speed cigarette packaging unit. Background technique [0002] At present, in the cigarette packaging film market, the supporting film for packaging small packs of cigarettes in hard boxes is mainly suitable for cigarette packaging units with a production speed of 400 packs / minute. [0003] Some large-scale tobacco companies have newly introduced several ultra-high-speed cigarette packaging production lines, and their production speed has been greatly improved compared with the old cigarette packaging units. Therefore, higher requirements are put forward for the BOPP small packs of cigarettes. [0004] The new ultra-high-speed cigarette packaging unit has the following differences from the old traditional cigarette packaging unit: (1) The production speed of cigarette packaging has increased sharply, reaching 1000 packs per minute, which is abou...

AI Technical Summary

Problems solved by technology

[0004] The new ultra-high-speed cigarette packaging unit has the following differences from the old traditional cigarette packaging unit: (1) The production speed of cigarette packaging has increased sharply, reaching 1000 packs per minute, which is about 2.5 times the speed of the original cigarette packaging unit. The smoothness is improved compared with the past; (2) The film needs to be transported over a long distance in the cigarette packaging unit, and the use span is increased, and the on-site mechanical cutting and double-lane packaging method are adopted, which has a great impact on the stiffness and elastic modulus of the film. Higher requirements are put forward, and due to the long conveying distance, the vertical edge problem of the film is also more prominent, which requires the thickness of the film roll to be very uniform, and controlling the thickness becomes a key factor in the quality of the film roll; (3) The film roll used The specification is twice as large as that of the traditional film roll, and the winding process parameters of the film roll need to be adjusted accordingly; (4) During the unwinding and conveying process of the old-style cigarette packaging unit, there are fewer guide rollers and no soft scraping plastic sheet , but in the ultra-high-speed cigarette packaging unit, not only more guide rollers pass through, but also a soft scraping plastic sheet that plays a role in flattening, which has a large friction on the film, and the general film cannot meet the manufacturer's resistance at all. grinding requirements

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