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Polymer-coated heat-sealable packaging material, method for manufacturing the same and a closed package made thereof

A packaging material and sealing packaging technology, applied in the fields of polymer-coated packaging materials, polymer heat-sealing layers, and packaging parts, can solve problems such as insufficient water vapor barrier, and achieve the effect of strengthening protection

Inactive Publication Date: 2004-09-08
STORA ENSO OYJ
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Based on the observations stated above, the object of the present invention is to solve the problems caused by existing fibre-based packaging materials and the insufficient water vapor barrier properties of the packages from these joints

Method used

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  • Polymer-coated heat-sealable packaging material, method for manufacturing the same and a closed package made thereof
  • Polymer-coated heat-sealable packaging material, method for manufacturing the same and a closed package made thereof
  • Polymer-coated heat-sealable packaging material, method for manufacturing the same and a closed package made thereof

Examples

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Comparison scheme
Effect test

Embodiment 1

[0037] Preparation of an extrusion coated packaging board with layer structure: LDPE layer, weight 5g / m 2 , HDPE layer, weight 15g / m 2 , bottom plate, weight 190g / m 2 , HDPE layer, weight 15g / m 2 And LDPE layer, weight 5g / m 2 . At a temperature of 38° and a relative humidity of 90%, the water vapor permeability of the paperboard was measured to be 6.4g / m 2 / d. The cardboard had significantly less curl.

Embodiment 2

[0039] Prepare an extrusion coated packaging board with layer structure: LDPE layer, weight 10g / m 2 , HDPE layer, weight 10g / m 2 , bottom plate, weight 255g / m 2 , HDPE layer, weight 20g / m 2 And LDPE layer, weight 25g / m 2 . At a temperature of 38° and a relative humidity of 90%, the water vapor permeability of the paperboard was measured to be 4.6g / m 2 / d. The result is the average of the permeability values ​​measured in different directions.

Embodiment 3

[0040] Embodiment 3 (reference)

[0041] For reference, an extrusion coated paperboard was prepared with the layer structure: LDPE layer, weight 20g / m 2 , bottom plate, weight 255g / m 2 , HDPE layer, weight 20g / m 2 And LDPE layer, weight 20g / m 2 . The paperboard has an average water vapor permeability of 5.5g / m 2 / d. The paperboard was significantly more curled than the paperboard described in Examples 1 and 2.

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Abstract

The invention relates to a manufacturing method of a heat-sealable packaging mate-rial, a polymer-coated packaging material manufactured using the method, and a sealed package to be manufactured of the material. The packaging material com-prises a fibre base, such as a packaging board (5), and an inner, extruded water va-pour barrier layer (2, 9) on both sides, containing high-density polyethylene (HDPE), and an outer heat sealing layer (1, 10), the material of which is, for example, low-density polyethylene (LDPE). Further, polymeric oxygen barrier layers (7) can be incorporated in the packaging material, the material of the oxygen barrier layers being, for example, ethyl vinyl alcohol copolymer (EVOH) or polyamide (PA). With the HDPE layer, the permeation of water vapour is prevented to both di-rections, and the location of the extruded layers on both sides of the fibre base re-duces the curling of the material. The packages according to the invention comprise carton, box and bag packages for dry and liquid foods.

Description

technical field [0001] The invention relates to a process for the production of a heat-sealable packaging material, in which process a fibrous substrate is provided on both sides with a polymeric heat-sealing layer. Furthermore, the invention relates to the polymer-coated packaging material obtained by this method and to a package produced therefrom by folding and heat sealing. Background technique [0002] Impermeability is especially required for packaging materials used to package food products in order to prevent premature spoilage of the product. Typically, both oxygen and water vapor impermeability are required for liquid foods such as dairy products and fruit juices, while good water vapor impermeability alone is an essential requirement in the packaging of certain dry foods. Unlike oxygen impermeability, water vapor impermeability can be very important not only for the protection of the packaged product, but also for the protection of the packaging material itself, ...

Claims

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Application Information

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IPC IPC(8): B65D30/02B29C47/06B29K23/00B29L9/00B32B27/12B32B27/32B65D65/40
CPCY10T428/1307Y10T428/31993B32B27/12Y10T428/24942B32B27/32Y10T428/31982Y10T428/31971Y10T428/31986Y10T428/1303B32B2439/62B32B2439/70B32B2323/046B32B2323/043B32B2307/7246B32B2307/7244B32B2439/46B32B7/12B32B37/153B32B2307/31B32B2250/40B32B2250/242
Inventor T·彭蒂宁K·内瓦莱宁J·耶尔维宁
Owner STORA ENSO OYJ
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