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Thermal contraction bag for packaging cheese

A technology of heat shrinkage and cheese, which is applied in the field of packaging materials and plastic products, can solve the problems of large shrinkage force, low shrinkage rate, poor barrier property, etc., and achieve the effects of impact strength resistance, good heat sealing performance, and good transparency

Active Publication Date: 2008-11-19
安徽天加新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a multi-layer co-extruded heat-shrinkable bag for cheese packaging, which aims to effectively overcome the low shrinkage rate, large shrinkage force, poor barrier property, and brittleness at low temperature of the existing multi-layer co-extruded heat-shrinkable bag. Technical defects, in order to better meet the requirements of shrink packaging for cheese preservation

Method used

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  • Thermal contraction bag for packaging cheese

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] First prepare the raw materials of each layer, core layer B: 98kg of VDC-MA copolymer and 2kg of epoxidized soybean oil. Surface layer A: 40kg of ethylene-propylene copolymer and 60kg of ethylene-EBA copolymer, the density of ethylene-propylene copolymer is 0.917g / cm 3 . Heat seal layer C: 60kg of ethylene-butene copolymer and 40kg of VLDPE, the density of ethylene-butene is 0.89g / cm 3 , the density of VLDPE is 0.918g / cm 3 . Adhesive layer D and adhesive layer E: 12kg of EVA with a density of 0.93g / cm 3 .

[0024] The raw materials of each layer are added to the extruder of each layer to melt and plasticize, and then enter a multi-layer co-extruded circular die to distribute the melt to form a multi-layer circular melt tube; The body tube blank is cooled and formed by vacuum sizing, and then enters the hot water tank to be heated to a suitable blowing temperature, and the compressed air is filled between two pairs of nip rollers for horizontal blowing and longitudi...

Embodiment 2

[0026] First prepare the raw materials of each layer, core layer B: 98kg of VDC-MA copolymer and 2kg of epoxidized soybean oil. Surface layer A: 50kg of ethylene-propylene copolymer and 50kg of ethylene-EEA copolymer, the density of ethylene-propylene copolymer is 0.88g / cm 3 . Heat seal layer C: 80kg of ethylene-hexene-1 copolymer and 20kg of LMDPE, the density of ethylene-hexene-1 copolymer is 0.916g / cm 3 , the density of LMDPE is 0.90g / cm 3 . Adhesive layer D and adhesive layer E: 28kg of EVA with a density of 0.95g / cm 3 .

[0027] Other methods and structures are the same as in Embodiment 1.

Embodiment 3

[0029] First prepare the raw materials of each layer, core layer B: 98kg of VDC-MA copolymer and 2kg of epoxidized soybean oil. Top layer A: 100 kg of ethylene-EMAA copolymer. Heat seal layer C: 100kg of ethylene-octene-1 copolymer, the density of ethylene-octene-1 copolymer is 0.918g / cm 3 . Adhesive layer D and adhesive layer E: 12 kg of maleic anhydride-modified ethylene polymer.

[0030] Other methods and structures are the same as in Embodiment 1.

[0031]After testing, the main performance indicators of the heat-shrinkable film obtained by adopting the technical solution of the present invention are shown in Table 1.

[0032] Table 1

[0033] Test items

Example 1

Example 2

Example 3

Longitudinal and transverse tensile strength

51MPa

55MPa

52MPa

[0034] Test items

Example 1

Example 2

Example 3

Transmittance

80％

82％

85％

Longitudinal and transverse elongation at break...

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Abstract

The invention provides a thermal shrinkage bag for cheese package, comprising a surface layer, a core layer and a heat-sealing layer. The surface layer and the heat-sealing layer are respectively bonded with the core layer via binding layers, the core layer is a mixture of 98wt% of PVDC resin and 2wt% of processing assistant, the PVDC resin is a VDC-MA copolymer, the processing assistant is an epoxy soybean oil or other plasticizer systems; the surface layer contains resin a and resin b, the resin a is an ethylene-ALPHA-olefin copolymer or a mixture of multiple ethylene-ALPHA-olefin copolymers, the resin b is an EMAA, EAA, EVA, EBA or EEA copolymer; and the heat-sealing layer comprises resin c and resin d, the resin c is a copolymer of ethylene and propylene, butylenes, hexylene-1 or octylene-1, and the resin d is a mixture of one or more selected from LLDPE, POP, VLDPE, LMDPE and CEO. The technical proposal provided in the invention effectively solves the shrinkage ratio, barrier properties and other problems; has proper oxygen and carbon dioxide gas permeation ratio and excellent heat seal-ability; and is suitable for fresh-keeping shrink package of cheese.

Description

technical field [0001] The invention relates to a heat-shrinkable film, in particular to a heat-shrinkable bag used for cheese packaging, and belongs to the technical field of plastic products and packaging materials. Background technique [0002] The film produced with polyamide as the main resin has natural shrinkage at room temperature; the shrink film processed with polyvinylidene chloride resin as the main raw material has the disadvantages of difficult processing, large equipment investment, and environmental pollution. Such as Japan Kureha Chemical Industry Co., Ltd.'s "stretched multi-layer film casing and its preparation method", the publication number is CNI 252348A; the "multi-layer heat-shrinkable film" of the American Creowac Company, the publication number is CNI 1 90367A; the "heat-shrinkable multilayer film" of Japan Kureha Chemical Industry Co., Ltd., the publication number is CNI 365886A; Heat shrinkable films produced by water cooling and double bubble me...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B65D65/40B65D85/76B32B27/08B32B7/12B32B27/22C08L27/08C08L23/08C08K5/1515C09J123/08C09J151/06
Inventor 张建岭张文芳
Owner 安徽天加新材料科技有限公司
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