Highly obstructed multilayer coextrusion thermal shrink film

A heat-shrinkable film, multi-layer co-extrusion technology, applied in the direction of layered products, synthetic resin layered products, flexible coverings, etc. Good oxygen barrier properties, high tensile strength, improved optical properties

Inactive Publication Date: 2012-07-11
SUNRISE PACKAGING MATERIAL JIANGYIN CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, such packaging films lack the necessary transparency and gloss, and cannot meet the requirements of various products for films.

Method used

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  • Highly obstructed multilayer coextrusion thermal shrink film
  • Highly obstructed multilayer coextrusion thermal shrink film
  • Highly obstructed multilayer coextrusion thermal shrink film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] as attached figure 1 The structure shown is a five-layer co-extruded heat-shrinkable film consisting of two layers of polyolefin resin (A and E), one layer of ethylene-vinyl alcohol copolymer barrier layer (C) and two layers of bonding material (B and D) form. The thickness ratio of each layer is A: B: C: D: E = 30%: 15%: 10%: 15%: 30%. The film with this structure has good heat sealing performance, and has better oxygen barrier and moisture barrier capabilities. .

[0032] The first layer A uses an extruder to make the main raw material resin ethylene-α-olefin copolymer or a mixture of multiple ethylene-α-olefin copolymers (the weight content ranges from 0% to 60%), wherein the weight content of α-olefin is 1 %~20%; Ethylene and EMAA [is an ionomer of ethylene-(meth)acrylic acid zinc salt, sodium salt, lithium salt, etc.], EVA (ethylene and acetic acid copolymer), EBA (butyl acrylate and ethylene copolymer) The copolymer, in which the weight content of the carboxyli...

Embodiment 2

[0038] as attached figure 2 The structure shown is a five-layer co-extruded heat-shrinkable film consisting of two layers of polyolefin resin (A and G), two layers of PA barrier layers (C and E), one layer of ethylene-vinyl alcohol copolymer The barrier layer (D) is formed with two layers of bonding material (B and F). The thickness ratio of each layer is A:B:C:D:E:F:G=27%:15%:8%:8%:8%:15%:17%. It has good oxygen and water vapor barrier properties, high shrinkage rate, and can be used for fresh-keeping shrink packaging of chilled meat and cheese.

[0039] The uppermost layer A uses an extruder to make the main raw material resin ethylene-α-olefin copolymer or a mixture of multiple ethylene-α-olefin copolymers (the weight content ranges from 0% to 60%), wherein the weight content of α-olefin is 1%. ~20%; the copolymer of ethylene and EMAA, EVA, EBA, wherein the weight content of the carboxylic acid monomer is 5% ~ 25%, after uniform stirring in the mixing hopper at the front...

Embodiment 3

[0046] as attached image 3 The structure shown is a five-layer co-extruded heat-shrinkable film. The multi-layer co-extruded shrinkable film consists of two layers of polyolefin resin (C and I) in the outer layer of polyethylene phthalate (PET (A)), two layers of PA barrier layer (E and G), a barrier layer of ethylene-vinyl alcohol copolymer (F) and three layers of bonding material (B, D and H). It has good oxygen and water vapor barrier properties, high shrinkage rate, and good surface printing effect. It can be used for fresh-keeping shrink packaging of chilled meat and cheese.

[0047] The uppermost layer A, the main raw material resin PET and additives are uniformly stirred in the mixing hopper at the front end of the extruder by an extruder, and the resin is plasticized at 160-280°C, and extruded into the uppermost layer A of the mold in the runner;

[0048] For the second layer B, use an extruder to plasticize the adhesive material resin at 160-280°C, and extrude it i...

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Abstract

The invention discloses a highly obstructed multilayer coextrusion thermal shrink film which comprises a heat sealing layer, an outer surface layer, an obstruction layer and a bonding layer, wherein the heat sealing layer, the outer surface layer and the obstruction layer are contacted with a packaged object, and the bonding layer connects the outer surface layer, the heat sealing layer and the obstruction layer; the heat sealing layer comprises polyolefin resin; the outer surface layer comprises polyethylene with middle density and the like; the obstruction layer comprises at least one layer of one out of ethylene-vinyl alcohol copolymer or polyamide or the mixture of the two; and the structure of the multilayer coextrusion thermal shrink film has 5-9 layers. The highly obstructed multilayer coextrusion thermal shrink film has good oxygen obstruction performance and higher tensile strength, and even objects sensitive to air cannot suffer from the risk that the color is changed or even aged or the food flavor is changed due to entrance of oxygen after being stored for a longer time. Furthermore, the structure of the outer layer can improve the optical property, the mechanical property, the surface printing capability and the stretching capability, and resist high temperature sealing and burning.

Description

technical field [0001] The invention relates to the component structure of the plastic film, in particular to a high-barrier multi-layer co-extruded heat-shrinkable film. Background technique [0002] Commodity packaging plays an important role in the storage, quality assurance and beautification of commodities. Shrink film has a good display effect, trademarks, icons, and packaged objects are clearly visible, beautiful and tidy, shrinks tightly and brightly, and also has excellent toughness and stiffness. It can provide excellent packaging integrity during transportation and loading and unloading. The shrinkage tension generated by its high shrinkage rate can tightly wrap a group of items to be packaged, which is very suitable for the collective packaging of multiple items, especially for the packaging of special-shaped items. In the early stage of the market, due to the high price of heat shrinkable film, the market capacity is not very large except for domestic enterpris...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B27/08B32B27/18B32B27/32B32B27/30B65D65/40
Inventor 宋建新
Owner SUNRISE PACKAGING MATERIAL JIANGYIN CO LTD
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