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Thinned high-barrier liquid packaging film and manufacturing method thereof

A high-barrier, packaging film technology, applied in packaging, wrapping paper, transportation and packaging, etc., can solve the problems of large temperature difference in use of the film, plummeting gas barrier performance, harmful gas unfavorable environmental protection and other problems, to extend the shelf life of food and shelf life. period, improve the gas barrier effect, and facilitate the effect of recycling and reuse

Inactive Publication Date: 2009-08-26
马龙升
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since polyvinyl alcohol is a water-soluble resin, the water resistance is poor, and the gas barrier performance plummets under high-humidity conditions.
If a layer of modified polyvinyl alcohol is coated on the polyethylene-based film, a more rigid material is used as a protective layer, such as thin aluminum sheet, aluminized film, polyethylene terephthalate (PET), Chlorinated polypropylene (CPP), biaxially oriented polypropylene (BOPP), etc., can maintain the barrier properties of the composite film at a certain humidity, while improving rigidity, and the film thickness is low, which is indeed progressive, but in actual use At that time, it was found that there were still some shortcomings in its structure, which caused the high barrier liquid packaging film to fail to achieve the best use effect in practical application, and its shortcomings can be summarized as follows:
[0006] 1. The polyethylene film used for the base film has poor rigidity, so it is necessary to use relatively high-priced materials such as PET, BOPP, CPP, and aluminized film with good rigidity as the protective layer to make up for its deficiency, which increases production costs;
[0007] 2. The characteristics of the raw materials used for the base film and the protective layer film are different, and the temperature difference of each layer of film is large. In actual production, it is easy to have wire drawing and bag connection, resulting in an increase in damage rate;
[0008] 3. Due to the high temperature of horizontal sealing, the horizontal sealing die head maintains high temperature for a long time, which shortens the service life of the packaging machine;
[0009] 4. Due to the different operating temperatures of the materials used, they are basically not recyclable, and the harmful gases produced during incineration are not conducive to environmental protection
[0010] This shows that the above-mentioned existing high barrier liquid packaging film obviously still has inconvenience and defects in production and use, and needs to be further improved urgently.

Method used

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Examples

Experimental program
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Effect test

preparation example Construction

[0036] 1. Preparation of polyethylene-based film.

[0037] The polyethylene base film of the present invention is made of outer, middle and inner three layers, and its respective raw material formula is (weight percentage)

[0038] Outer layer MDPE or HDPE or a mixture of the two in any proportion 30-52

[0039] LLDPE 15-60

[0040] PE white mother 10-28

[0041] Polybutene (PB) 0-5

[0042] Middle layer MDPE or HDPE or a mixture of the two in any proportion 30-60

[0043] LLDPE 0-20

[0044] Metallocene linear low density polyethylene (mPE) 25-40

[0045] PE white mother 0-15

[0046] PE black mother 0-10

[0047] Inner layer LDPE 25-40

[0048] LLDPE 10-25

[0049] mPE40-50

[0050] PE black mother 0-10

[0051] Weigh the raw materials of each component according to the above formula, after stirring evenly, add them to the hoppers of the three-layer co-extrusion film blowing machine according to the requi...

specific Embodiment 1

[0082] Use a plastic co-extrusion blown film unit to produce a polyethylene-based film heat-sealing layer with a thickness of 50 microns. The weight percentage of each component is the outer layer: MDPE45%, LLDPE40%, PB3%, PE white masterbatch 12%; middle layer: MDPE55%, PE white masterbatch 15%, mPE30%; inner layer: LDPE35%, mPE45%, LLDPE13.5%, PE black masterbatch 6.5%. The surface tension is 38-42 dynes by corona treatment machine.

[0083] Use a dry compound machine (with coating and compounding functions) to coat 0.6g / m2 polyvinyl alcohol on the outer layer of the heat-sealing layer of the polyethylene base film, and the proportion of each component of the polyvinyl alcohol solution is: polyvinyl alcohol 18.7 %, reinforcing tackifier 2.5%, surfactant 0.93%, water 77.87%.

[0084] Use a computer automatic gravure printing machine to print the required patterns, characters, etc. on the surface of the polyvinyl alcohol coating.

[0085] Use a plastic co-extrusion blown fil...

specific Embodiment 2

[0088] A plastic co-extrusion blown film unit is used to produce a polyethylene-based film heat-sealing layer with a thickness of 52 microns. The weight ratio of each component is the outer layer: MDPE 45%, LLDPE 43%, PE white masterbatch 12%; the middle layer: MDPE 50%, PE white masterbatch 14%, mPE 36%; inner layer: LDPE 35%, mPE 45%, LLDPE 14%, PE black masterbatch 6%. The surface tension is 38-42 dynes by corona treatment machine.

[0089] Coat 0.60g / m on the outer layer of the heat-sealing layer of the polyethylene-based film with a dry laminating machine 2 The polyvinyl alcohol, the proportioning of each component of the polyvinyl alcohol solution is: polyvinyl alcohol 17.4%, reinforcing tackifier 1.35%, surfactant 0.65%, water 80.6%.

[0090] A plastic co-extrusion blown film unit is used to produce a polyethylene film protective layer with a thickness of 22 microns. The proportion of each component is the outer layer: LDPE 35%, LLDPE 62%, nano-organic montmorillonite ...

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Abstract

The invention relates to a thinned high-barrier liquid packaging film and its manufacturing method. The product comprises a polyethylene-based film, a polyvinyl alcohol high-barrier layer, a composite adhesive layer and a polyethylene film protective layer from bottom to top, wherein the The polyethylene-based film includes an outer layer, a middle layer and an inner layer, wherein the outer layer and the middle layer contain at least one of medium-density polyethylene or high-density polyethylene; its manufacturing method includes: preparation of the polyethylene-based film; polyvinyl alcohol coating Preparation of cloth liquid; preparation of polyethylene film protective layer; coating and compounding, which include diluting polyvinyl alcohol coating liquid, coating the diluted polyvinyl alcohol coating liquid on the outer layer of polyethylene base film to form polyvinyl alcohol coating liquid Vinyl alcohol high barrier layer, composite polyethylene film protective layer and polyvinyl alcohol coating layer; aging, cutting. The product of the invention has the advantages of thin thickness, good rigidity, high barrier property, environmental protection, convenient use, low cost and simple process.

Description

technical field [0001] The invention relates to a thinned high-barrier liquid packaging film and a manufacturing method thereof, in particular to a thinned polyethylene, polyvinyl alcohol high-barrier liquid packaging film and a manufacturing method thereof. Background technique [0002] With the increasingly fierce competition in the liquid food market and the rising price of plastic raw materials for packaging, liquid food manufacturers have higher and higher requirements for the production cost and oxygen barrier and fresh-keeping performance of plastic packaging materials for packaging. How to reduce the production cost of packaging materials , and can prolong the shelf life and shelf life of the contents to meet the packaging requirements of liquid food, which is one of the problems to be solved in the field of liquid food packaging materials today. [0003] Most of the liquid packaging films currently used in the market are produced by high-pressure polyethylene (LDPE)...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B65D65/40B65D65/42B32B27/08B32B27/30B32B27/18B32B7/12B32B37/00B29C69/00B29C70/68B29K23/00B29K623/00B29K29/00B29L7/00
Inventor 马龙升
Owner 马龙升
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