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Laminated packaging material, method for making said laminated material and package container made of said laminated material

A technology of packaging materials and core layers, applied in the field of manufacturing laminated packaging materials of the present invention, can solve the problems of not being able to easily bond extrusion adhesive layers, poor adhesion, high environmental damage, etc.

Inactive Publication Date: 2004-05-12
TETRA LAVAL HLDG & FINANCE SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

To provide adhesion between the paper and polyamide layers, adhesives such as urethane, acrylic, and polyester must be used, or an intermediate adhesive layer, which in laminates Multiple and / or different materials are required in turn, resulting in higher costs and higher environmental damage from a working environment and natural resource management point of view
Also, in such laminates, the adhesion between the paper layer and the polyamide layer is most likely to be the worst, since the surface of the preformed film oxidizes and / or hardens, and cannot easily bond to the extrusion bond. layered
In particular, the process for making such laminates is more cumbersome and very cost-ineffective because it requires the additional step of prefabricating the biaxially oriented film

Method used

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  • Laminated packaging material, method for making said laminated material and package container made of said laminated material
  • Laminated packaging material, method for making said laminated material and package container made of said laminated material
  • Laminated packaging material, method for making said laminated material and package container made of said laminated material

Examples

Experimental program
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Effect test

example 1

[0081] Comparison of Barrier Properties: Different Polyamide Oxygen Barriers

[0082] Measured against the complete packaging material structure, i.e. a co-extruded 5-layer structure (g / m 2 ):

[0083] LDPE(13) / board / LDPE(10) / composite film adhesive layer(5) / PA(barrier layer)(6) / composite film adhesive layer(5) / LDPE(25)

[0084] Barrier coating weight: 6 and 10 g / m respectively 2

[0085] PA6: Standard PA-6 1024B grade in UBE industry

[0086] Selar PA3508: Amorphous polyamide

[0087] When used alone in the gas barrier layer, the oxygen permeability value of PA6 is about as high as Selar polyamide at 0% RH, but higher at higher relative humidity. As a separate gas barrier layer, Selar PA or PA6 is not economically important for ESL packaging.

[0088] Test method: "Mocon oxtran", 1000 flat sample method, test gas: 100% oxygen, T=23°C, t=24h, RH: 50%, 1atm, n (number of samples)=5

[0089] Table 1

[0090] Polyamide grades in barrier layers

Permeability...

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PUM

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Abstract

A laminated packaging material (10) comprising a core layer (11) of paper or paperboard and a gas barrier layer (12) of a polyamide mixture comprising m-xylenediamine and adipic acid A polycondensate of (Nylon-MXD6) and a second crystalline or semi-crystalline polyamide, which polycondensate is applied on one side of the core layer (11) by coextrusion coating. And a method of manufacturing a laminated packaging material and a packaging container (30) made from the laminated packaging material.

Description

technical field [0001] The present invention relates to a laminated packaging material comprising a core layer of paper or cardboard and a gas barrier layer of polyamide comprising m-xylylenediamine and adipic acid (Nylon-MXD6 ), which is applied by coextrusion coating on the core layer and on one side of at least one heat-sealable plastic layer. [0002] The invention also relates to a method of manufacturing the laminated packaging material according to the invention and the packaging container made of the laminated packaging material. Background technique [0003] In the packaging industry, it is known to use laminated packaging materials with special properties to package and deliver liquid foods. Typically, such laminated packaging materials consist of a rigid structural but foldable core layer, for example made of paper or cardboard, in order to obtain good mechanical structural stability. A liquid-tight coating of plastic is coated on both sides of the core and effe...

Claims

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Application Information

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IPC IPC(8): B65D81/24B29C47/06B29K77/00B29L7/00B32B7/02B32B7/12B32B27/08B32B27/10B32B27/34B32B37/00B32B37/15B65D3/22B65D65/40B65D71/08
CPCB32B37/153B32B27/10B32B2310/0445B32B2310/14B32B2310/0481B32B27/08B32B38/0008Y10T428/1303Y10T428/1393Y10T428/1317Y10T428/1321Y10T428/31725Y10T428/31504Y10T428/31739Y10T428/31743
Inventor N·托夫特I·波斯托尔卡
Owner TETRA LAVAL HLDG & FINANCE SA
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