FFS packaging film and preparation method thereof

Abstract

The invention provides an FFS packaging film, and a preparation method thereof. The FFS packaging film comprises three parts, i.e., an outer layer, a middle layer and an inner layer, which are sequentially arranged from outside to inside at a weight ratio of (1-2):(1-3):1, wherein according to parts by weight, the outer layer comprises 30-40 parts of LDPE 2420H and 60-70 parts of LLDPE LL0220AA, the middle layer comprises 30-40 parts of LDPE 2426H and 60-70 parts of LLDPE LL0220AA, and the inner layer comprises 30-40 parts of LDPE 2426H, 60-70 parts of LLDPE 1002BU, 1-2 parts of the anti-blockagent 10063, and 1-2 parts of a smooth masterbatch. The preparation method of the FFS packaging film provided by the invention has the advantages that the production technique is simple, equipment requirements are not strict, the cost is low, the efficiency is high, and the prepared film has good mechanical and surface friction properties and is not sticky during use.

Description

technical field [0001] The invention belongs to the technical field of packaging films, and relates to a packaging film and a preparation method thereof, in particular to an FFS packaging film and a preparation method thereof. Background technique [0002] FFS (Form-Fill-Seal) three-layer co-extrusion heavy packaging film is a new type of packaging material developed in China in recent years, because it can realize one-time automatic forming (Form), automatic opening filling (Fill) and automatic The multi-process high-speed continuous operation of bag heating and sealing (Seal) is especially suitable for large-volume industrial high-speed packaging lines. [0003] In order to ensure that the heavy-duty packaging film has high mechanical strength and heat-sealing strength, the heavy-duty packaging film usually uses metallocene linear low-density polyethylene resin (m-LLDP) copolymerized with hexene or octene, and linear low-density polyethylene resin copolymerized with hexene...

AI Technical Summary

Problems solved by technology

The existing heavy packaging film formula not only has many raw materials, but also the prepared heavy packaging film has unsatisfactory strength

It is also prepared by mixing a large amount of hexene or octene copolymerized linear low-density polyethylene resin (m-LLDPE), homopolymerized low-density polyethylene resin (LDPE) and butene-copolymerized high-density polyethylene resin (HDPE). However, due to the high strength LLDPE, m-LLDPE and rigid HDPE, the heavy packaging film produced is difficult to be widely used in production due to the strict requirements on the processing capacity of the equipment. At present, the commonly used solution is to add LDPE to improve the processing capacity of the overall raw materials. However, the addition of LDPE greatly reduces the strength of the heavy packaging film and reduces the economic value of the product

[0004] CN103059402A discloses a kind of FFS single-layer heavy packaging film and its preparation method, by adopting ethylene-vinyl acetate copolymer, metallocene linear low-density polyethylene and ultra-low density polyethylene to improve the mechanical properties of FFS single-layer heavy packaging film CN103029388A discloses a kind of three-layer co-extrusion heavy packaging film and preparation method thereof, also is to improve three-layer co-extrusion by selecting appropriate m-LLDPE, MDPE (medium density polyethylene) and EVA (ethylene-vinyl acetate copolymer) raw material The mechanical properties, heat sealing properties and surface friction properties of the squeezed packaging film, but the FFS single-layer heavy packaging film obtained by the above patent is prone to sticking during reprocessing

The FFS film used for heavy packaging uses a large amount of LDPE, which affects the overall strength of the film. At the same time, HDPE has strict requirements on equipment and requires the purchase of customized special equipment, which not only increases the production cost of heavy packaging film, but also has a difficult production process. promotional use

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