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Multilayer coextruded liquid packaging film capable of reducing leakage rate

A multi-layer co-extrusion and packaging film technology, applied in packaging, packaging paper, packaging food, etc., can solve the problems of increasing the cost of casting machines, increasing product costs, and affecting food safety, so as to save resources, improve mechanical strength, cost reduction effect

Inactive Publication Date: 2011-04-20
刘建林
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] 3. Since the existing film blowing equipment cannot be used to blow polypropylene (PP) film, a casting machine is used
The cost increases due to the need to increase the purchase of very expensive casting machines
[0014] 4. Since the composite process must be used, and the composite process must use the composite glue and solvent necessary for the composite, the product cost is greatly increased, and the carbon emission is increased, which is not good for the environment.
In addition, improper control of residual solvents during compounding will also affect food safety

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] {(b) Example 1 of the blend (d) in the middle layer and the outer layer}

[0047] In the embodiment of the present invention, multi-layer co-extrusion can reduce the liquid packaging film of leakage rate, (b) the blend (d) in the middle layer and the outer layer is made of 80wt% polypropylene (PP), (the brand is : T30S, manufacturer: Qilu Petrochemical), 2wt% ethylene-vinyl acetate copolymer (EVA) and 18wt% high-density polyethylene (HDPE), (brand: 5000S, manufacturer: Daqing Petrochemical). After fully mixing the polypropylene (PP), ethylene-vinyl acetate copolymer (EVA), and high-density polyethylene (HDPE) with a mixer, extrude and granulate with a twin-screw extrusion granulator to obtain multi- Layer co-extrusion can reduce the leakage rate of the liquid packaging film (b) and the blend (d) in the middle layer and the outer layer. The processing temperatures of each section of the twin-screw extrusion granulator are: 170°C, 180°C, and 190°C , 190°C, 190°C.

Embodiment 2

[0049] {(b) Example 2 of the blend (d) in the middle layer and the outer layer}

[0050] In the embodiment of the present invention, multi-layer co-extrusion can reduce the liquid packaging film of leakage rate, (b) the blend (d) in the middle layer and the outer layer is made of 60wt% polypropylene (PP), (the brand is : T30S, 800E mixture, manufacturer: Shanghai Kesai), mixing ratio: (1:1), 10wt% metallocene polypropylene, 20wt% medium density polyethylene (MDPE), (brand: 2310, manufactured Manufacturer: Borealis) and 10wt% color masterbatch (manufacturer: Hebei Bairuier). After fully mixing the polypropylene (PP), metallocene polypropylene, medium density polyethylene (MDPE) and color masterbatch with a mixer, extrude and granulate with a twin-screw extrusion granulator to obtain a multilayer The blend (d) in the middle layer and the outer layer of the liquid packaging film (b) that can reduce the bag leakage rate by co-extrusion, the processing temperatures of each section...

Embodiment 1

[0052] In the present embodiment, multilayer co-extrusion can reduce the liquid packaging film of leakage rate, (a) by 40wt% low-density polyethylene (LDPE), (brand: 2420H), 30wt% linear low-density polyethylene (LLDPE) , (brand: 7042), 30wt% metallocene polyethylene (MLLDPE), (brand: 1018FA, manufacturer: ExxonMobil), the heat-sealing layer (a) composed.

[0053] (b) 40wt% low-density polyethylene (LDPE), (brand: 2426H, manufacturer: China Shipping Shell), 10wt% white masterbatch (brand: 906, manufacturer: Hebei Bairuier Packaging Material Co., Ltd.) , 50wt% of the blend (d), (Example 1) composed of (b) middle layer and outer layer.

[0054] In the heat-sealing layer (a), low-density polyethylene (LDPE), linear low-density polyethylene (LLDPE), and metallocene polyethylene (MLLDPE) are fully mixed with a mixer, and three layers of total Extrude the inner layer (heat seal layer) of the blown film machine in the silo of the extruder.

[0055] After the middle layer and the ou...

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Abstract

A liquid packaging film mainly used in the current market is a polyethylene (PE) thin film, and the total thickness of the various structural films of the liquid packaging film is 85 to 120 microns, wherein the PE has lower physical strength and mechanical strength because of a molecular structure; and the leakage rate is about 0.05 to 0.1 percent during filling, selling and transportation of various liquid food enterprises. After intensive research, an inventor discovers that the multilayer film which at least comprises a heat-sealing layer consisting of PE and a heat sealing reinforcing agent and reinforcing layers (a middle layer and an outer layer) made of the PE can unexpectedly reduce the total thickness of the film and has the leakage rate of less than 0.005 percent in the entire process of packaging, selling and transportation of liquid foods, wherein the heat-sealing layer is preferably made of mixture of polypropylene (PP), high-density polyethylene (PE) and a compatilizer.

Description

technical field [0001] The liquid packaging film currently used in the market is mainly polyethylene (PE) film, and the total thickness of its various structural films is between 85 microns and 120 microns. Among them, polyethylene (PE) has poor physical and mechanical strength due to its molecular structure. Various liquid food companies have a leakage rate of about 5 to 10 per ten thousand in the process of filling, sales and transportation. After in-depth research, the inventors have found that, by at least including polyethylene (PE) and a heat-sealing layer composed of a heat-sealing enhancer, it is preferably selected from: polypropylene (PP), high-density polyethylene (HDPE) and a compatibilizer The blend composed together, and the multilayer film of the reinforcement layer (middle layer, outer layer) composed of polyethylene (PE), can reduce the total thickness of the film unexpectedly, and at the same time have the advantages of packaging liquid food, In the whole pr...

Claims

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Application Information

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IPC IPC(8): B65D65/40B65D85/72B65D85/80B32B27/18B32B27/32
Inventor 刘建林
Owner 刘建林
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