Packaging film for two-way stretch polypropylene low temperature self-constriction cigarette and production method thereof

Abstract

The invention relates to a packaging film for two-way stretch polypropylene low temperature self-constriction cigarette and a production method thereof. The film comprises a surface layer A, a core layer B and a surface layer C; the surface layer A includes the raw materials according to the following weight percent: 80-90 of propylene copolymer, 5-10 of lubricate master batches and 5-10 of antiblocking master batches; the core layer B includes the raw materials according to the following weight percent: 62-77 of propylene homopolymer, 20-35 of hardness increase master batches and 3-5 of antistatic master batches; and surface layer C includes the raw materials according to the following weight percent: 80-94 of propylene copolymer, 3-10 of lubricate master batches and 3-10 of antiblocking master batches. The production method includes the following steps: (1) mixedly preparing; (2) making thick plates; (3) performing three-point stretching to the thick plates by three groups of stretching rollers to finally realize 6-8 multiples of longitudinal stretching after the thick plates enter into a longitudinal stretching machine; (4) transversely stretching; (5) towing and rolling up; and (6) dividing and cutting. The invention enables a cigarette factory to cancel a burning device and realizes the self-constriction in use of the cigarette film, thereby improving the packaging quality and beautifying the appearance of cigarette packs.

Description

(1) Technical field [0001] The invention relates to a biaxially stretched polypropylene low-temperature self-shrinkable packaging film for cigarettes and a preparation method thereof. It belongs to the technical field of packaging materials. (2) Background technology [0002] At present, the heat-shrinkable cigarette film products produced by domestic cigarette film manufacturers must be heated during use, so as to ensure the close adhesion between the cigarette case and the box skin. When packaged with common heat-shrinkable cigarette film, there will be problems that the package is not tightly attached, and there are wrinkles between the cigarette film and the box skin. Most cigarette factories solve this problem by adding a heating device. The use of the heating device makes the cigarette packs very close to a certain extent, but there are also obvious defects: [0003] ①Traditional ironing devices only heat the upper and lower surfaces of the two packs of cigarettes, a...

AI Technical Summary

Problems solved by technology

[0003] ①Traditional ironing devices only heat the upper and lower surfaces of the two packs of cigarettes, and the contact parts between the two packs of cigarettes cannot be ironed, so that the two surfaces that are not heated are more wrinkled than the two surfaces that are heated obvious;

[0004] ②Scalding causes the surface of the film to be heated and frictional, thus damaging the smoothness of the film and causing scratches on the surface of the film;

[0005] ③When the hood is shut down, the long-term contact between the heating device and the film will cause excessive shrinkage and melting of the film, which will affect the packaging quality;

[0006] ④ The maintenance and adjustment of the ironing device will bring more workload and time, which will affect the operating rate and output;

[0007] ⑤ The use of the ironing device consumes energy, which increases the packaging cost

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