Board, packaging material and package as well as production and uses thereof

a technology of packaging material and packaging material, applied in the field of packaging material and packaging as well as production and use thereof, can solve the problems of content acquiring content may acquire undesirable smell and/or taste, and it is especially difficult to design packaging for maintaining the original properties of contents

Inactive Publication Date: 2005-11-24
AKZO NOBEL NV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0018] (ii) subjecting the board to one or more converting operations selected from printing, varnishing, coating, laminating, metallizing, die cutting, scoring, creasing, foil blocking, embossing and folding.
[0019] The present invention is also generally directed to a packaging material comprising board which comprises one or more plies containing cellulosic fibres and hydrotalcite, wherein it further comprises one or more grooves, creases or scores.

Problems solved by technology

It has proven especially difficult to design packages for maintaining the original properties of contents, such as foodstuff, beverages, pharmaceuticals and cigarettes.
Despite the use of packages containing a combination of several materials, the content may acquire an undesirable smell and / or taste after some time.
The substances causing undesirable smell and taste are usually oxidation products formed during production and storage of the board.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0076] In this example, the efficiency of the invention to reduce undesirable and / or unpleasant taste, smell and / or odour of board was evaluated.

[0077] A chemical substance which is present in board and causes undesirable taste, smell and / or odour, n-hexanal, was chosen as a smelling model substance, hereinafter “smelling substance”. The content of the smelling substance was determined by the so-called hot method in which a sample consisting of 2.5 g of packaging material was placed in a vessel which then was sealed. After shaking for 5 min and subsequent thermostating at 100° C. for 40 min, an amount of gas above the sample was retrieved and immediately analysed in a gas chromatograph. The content of the smelling substance in the amount of gas was calculated from the top area of the chromatogram. The degree of undesirable taste, smell and / or odour was given as the smelling substance residue, which constitutes a percentage share of the content of smelling substance transferred from...

example 2

[0082] Board was made as described in Example 1 except that the amount of hydrotalcite added was different. The board obtained was analysed for filler content, also referred to as ash retention. Table 2 shows the results.

TABLE 2HydrotalciteTest No.[kg / t]Filler [%]107.62108.2

[0083] Table 2 shows that the filler level was higher when adding hydrotalcite in the process.

example 3

[0084] In this example, sizing performance was evaluated. A cellulosic suspension from a liquid packaging board mill was treated with hydrotalcite having the 3R2 stacking (CC-22, Akzo Nobel Catalyst B. V.) and with talc (Finntalc P05, Omya) respectively. Sizing, drainage and retention aids were added and hand sheets were made (SCAN-C 26:76). Sizing of the sheets was measured as Cobb 60 values (SCAN-P 12:64).

[0085] A thick cellulosic suspension (thick stock) was used based on furnish from a liquid packaging board (LPB) mill consisting of bleached softwood and hardwood pulp. The suspension was stirred and heated to 50° C. Hydrotalcite or talc was added to the suspension which was stirred for 30 minutes. The thick suspension was then diluted with tap water to a consistency of 5 g / L. The obtained suspension had a pH of 8 and conductivity of 0.7 mS / cm. Before sheet making, 0.3 kg / ton of dry pulp of AKD (Keydime C223, Eka Chemicals), 8 kg / ton of dry pulp of cationic starch (Perlbond 970)...

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Abstract

The invention relates to a process for producing board which comprises providing an aqueous suspension comprising cellulosic fibres; adding hydrotalcite to the suspension; dewatering the obtained suspension to provide a (i) single ply board. The invention further relates to board comprising one or more plies containing cellulosic fibres, wherein the board further comprises hydrotalcite distributed throughout at least one of said one or more plies.

Description

[0001] This application claims priority based on U.S. Provisional Patent Application No. 60 / 572,208, filed May 18, 2004.FIELD OF THE INVENTION [0002] The present invention generally relates to board containing cellulosic fibres and hydrotalcite as well as the production thereof; packaging materials and packages comprising the board and the production thereof as well as uses of the packaging materials for packaging of foodstuff, beverages, pharmaceuticals, cosmetics and tobacco. BACKGROUND OF THE INVENTION [0003] Packages are widely used throughout the world, for example to transport goods and protect the contents of the packages. It has proven especially difficult to design packages for maintaining the original properties of contents, such as foodstuff, beverages, pharmaceuticals and cigarettes. The quality of the content may be reduced either by the content itself changing over time, or by quality-reducing substances being supplied from or through the package. The content can be tr...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): D21H17/66D21H17/69D21H27/10D21H27/30
CPCD21H17/66D21H27/30D21H27/10D21H17/69
Inventor LINDGREN, ERIKSANNE, ERIKTOKARZ, MAREKNILSSON, JERKER
Owner AKZO NOBEL NV
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