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Method of manufacturing of a foam-formed cellulosic fibre material, sheet and laminated packaging material

A technology of cellulose fibers and packaging materials, applied in the field of laminated packaging materials, packaging containers, main sheets or molded products, and low-density cellulose fiber materials formed by foam, which can solve deterioration, low density, and increase cellulose density. And other issues

Active Publication Date: 2019-05-24
TETRA LAVAL HLDG & FINANCE SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] Another object is to produce such foam-formed cellulosic fiber materials which, on the one hand, maintain bulk thickness and low density, and on the other hand, maintain adequate or improved mechanical durability, such as delamination strength and z-direction compression resistance, without having to Addition of large quantities of reinforcing polymer additives or other additives that may degrade other properties of the material or increase the density of the foam-forming cellulose

Method used

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  • Method of manufacturing of a foam-formed cellulosic fibre material, sheet and laminated packaging material
  • Method of manufacturing of a foam-formed cellulosic fibre material, sheet and laminated packaging material
  • Method of manufacturing of a foam-formed cellulosic fibre material, sheet and laminated packaging material

Examples

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Embodiment 1

[0222] Modified cellulose pulp is prepared from unmodified lignocellulosic fiber pulp by oxidation of a fraction of the fibers in suspension to dialdehyde cellulose, based on the initial number of oxidizable C2-C3 bonds, the degree of conversion to about 30%, the dialdehyde cellulose is then reduced to diol cellulose. The average diameter of the cellulose fibers is at least 1 μm. The fibers of the present disclosure typically have an average diameter of at least 5 μm, such as at least 8 μm, such as at least 12 μm. The average length of the fibers of the invention is preferably at least 0.3 mm, eg 0.3 mm to 4 mm. However, any fiber length is conceivable as long as the fiber foam can be produced, for example up to 50 mm. The fibers of the present disclosure are preferably lignocellulosic in origin. The degree of conversion of cellulose to dialdehyde cellulose can be determined using the "carbonyl content determination" method described below. The fiber suspension used in the...

Embodiment 2

[0234] A blend of chemithermomechanical pulp (CTMP, freeness 600 ml) prepared in Example 1 similar to modified pulp and / or highly refined hardwood pulp was mixed and foamed. Add retention chemicals such as cationic starch (CS) and retention aid (RA) to the foam composition in the following order: CS at 0 seconds and RA 1 at 5 seconds (cationic polyacrylamide 0.4 kg / t) , at 10 seconds add RA2 (particles, from Hercules' " SP7200", 0.4kg / t"), and stop mixing at 15 seconds. Finally, the pulp foam is moved to a sheet mold and made into a sheet.

[0235] The results on Scott Bond delamination strength and tensile strain show the same improvement trend as Example 1. Therefore, the effect of adding modified cellulose containing diol cellulose was still significant regardless of the amount of starch and other retention additives added.

[0236] Figure 10 The relationship between delamination strength and the content of diol-modified cellulose is shown, and compared with the resul...

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Abstract

The invention relates to a method of manufacturing a new low density foam-formed cellulose material comprising dialcohol-modified celllulose, and to bulk sheets, layers, laminates or moulded articlescomprising such material. Furthermore, the invention relates to a laminated packaging material comprising a layer or sheet comprising the low density cellulose material as well as to packaging containers comprising the laminated packaging material. In particular, the invention relates to packaging containers intended for liquid or semi-liquid food packaging, comprising the laminated packaging material.

Description

technical field [0001] The present invention relates to a process for the manufacture of novel foam-forming low density cellulosic fibrous materials. The present invention also relates to novel foam-formed low density cellulosic fibrous materials and body sheets or molded articles comprising such materials. [0002] Furthermore, the present invention relates to a laminated packaging material comprising a layer or sheet comprising a low density cellulosic material, and a packaging container comprising the laminated packaging material. Furthermore, the present invention relates to a packaging container for liquid or semi-liquid food packaging comprising a laminated packaging material. Background technique [0003] Single-use disposable type packaging containers for liquid food products are usually produced from paperboard or cardboard based packaging laminates. One such commonly occurring packaging container is the Tetra Brik Sold under the trademark, mainly used for asept...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B27/10B32B27/32B32B29/00D21H27/10D21H27/36D21H27/38D21H11/20D21H21/22B65D65/40B65D85/72B32B7/12B32B15/085B32B15/20D21H27/34D21H21/24D21H21/56
CPCB32B7/12B32B15/085B32B15/20B32B27/10B32B27/32B32B27/327B32B29/005B65D65/40B65D85/72D21H27/10D21H27/34D21H27/36D21H27/38D21H11/20D21H21/22D21H21/24D21H21/56B32B2262/062B32B2262/067B32B2270/00B32B2307/54B32B2307/72B32B2307/7244B32B2307/748B32B2439/70C08J9/35B29C44/02
Inventor 凯塔琳娜·乔纳森克里斯蒂安·内亚古
Owner TETRA LAVAL HLDG & FINANCE SA
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