heat-sealing BOPP film for cigarettes and preparation method of BOPP film

Abstract

The invention discloses a heat-sealing BOPP film for cigarettes. The BOPP film is prepared by directly co-extruding three layers of structures, namely a surface layer, a core layer and an inner layer; the surface layer is prepared from the following raw materials in parts by weight: 38-45 parts of a polypropylene random copolymer, 20-26 parts of a propylene-ethylene copolymer, 25-32 parts of an ethylene-methyl acrylate copolymer, 7.5-9 parts of modified crystal tourmaline powder, 1.5-2 parts of 1,6-hexanediol diglycidyl ether, 4.6-5.2 parts of a mixture of trimethylmethiloxy ammo-terminated polydimethylsiloxane and hydroxyl-terminated methyl-3,3,3-trifluoropropyl polysiloxane and 3-4.5 parts of polytetrafluoroethylene modified polyethylene wax powder; and the core layer is prepared from the following raw materials in parts by weight: 80-90 parts of homo-polypropylene, 12-17 parts of a propylene-ethylene copolymer, 7-9 parts of an ethylene-methyl acrylate copolymer and 2-3 parts of nano silicon dioxide. The heat-sealing BOPP film for the cigarettes has the advantages that the static / dynamic friction factor is small; the antistatic effect is good and lasting; and the low-temperature heat sealing performance is good, and the comprehensive performance is excellent.

Description

technical field [0001] The invention relates to the technical field of BOPP films for cigarette packaging, in particular to a heat-sealable BOPP film for cigarettes and a preparation method thereof. Background technique [0002] Biaxially oriented polypropylene (BOPP) film has the characteristics of light weight, transparency, non-toxicity, moisture resistance, low air permeability and high mechanical strength, and is widely used in food, clothing, medicine, chemical and other fields. BOPP film can be multilayered with polypropylene cast film, polyethylene film, polyvinyl alcohol film, etc., so as to improve the performance of the product such as gas barrier, moisture barrier, oil resistance and tear resistance. A packaging material. [0003] Cigarette film is a high-grade BOPP film, which has the characteristics of low heat sealing temperature, good barrier performance, high transparency and uniform thickness. Currently on the market, small packs of hard pack cigarettes m...

AI Technical Summary

Problems solved by technology

[0006] 1. The functional layer (surface layer) usually uses a terpolymer, which has high requirements for raw materials, and poor heat-sealing strength and low-temperature heat-sealing performance;

[0007] 2. Both the static and dynamic friction coefficients at room temperature are high, and when the ambient temperature is high in medium and high-speed packaging, the static / dynamic friction coefficient will increase significantly, resulting in poor packaging fluency;

[0008] 3. The antistatic effect is poor, and the antistatic effect is not durable;

[0009] 4. More small molecule additives are used, resulting in more migration and precipitation of small molecule additives during use, resulting in poor overall performance of the product;

[0010] 5. Poor comprehensive properties such as gloss and haze, heat shrinkage performance, and mechanical properties

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