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Method to produce fibrous product comprising microfibrillated cellulose

A technology of microfibrillation and cellulose, applied in the direction of chemical instruments and methods, post-treatment modification of cellulose pulp, layered products, etc., to achieve the effect of promoting manufacturing and reducing the amount of agglomeration

Active Publication Date: 2020-07-31
STORA ENSO OYJ
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Use of high-shear mechanical disintegration, which destroys flocs and strands formed, generally requires additional investment and only temporarily solves the problem

Method used

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  • Method to produce fibrous product comprising microfibrillated cellulose
  • Method to produce fibrous product comprising microfibrillated cellulose

Examples

Experimental program
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Embodiment

[0084] The effect of mixing fiber suspensions in a Diaf mixer on fibril aggregation was investigated in the presence of various additives. Before mixing, the suspension was diluted to a 1.5% by weight consistency using RO (reverse osmosis) water. The initial dispersion is typically achieved by dispersing a set amount of the fiber suspension in a dilute solution of the chemical additive using a stick mixer for 30 seconds (= standard addition mode). In reverse addition mode, dilute solutions of chemical additives are applied to the fibril suspension. In a standard two-additive system, the first chemical is applied using a standard mode of addition, ie fibrils are introduced into the additive solution and the second additive is dosed into the resulting mixture. In reverse dual mode, two chemical solutions are introduced into the fibril suspension. In the pre-mix mode, the chemical additives are mixed together before the fibrils are introduced into the resulting solution using t...

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Abstract

A method for the production of a fibrous product from a fibrous web, wherein the method comprises the steps of: providing a fibrous suspension comprising a microfibrillated cellulose, wherein the content of the microfibrillated cellulose of the suspension is in the range of 60 to 99.9 weight-% based on total dry solid content, adding an uncharged, amphoteric or weakly cationic polymer having a molecular weight of at least 50000 g / mol to the suspension, adding an anionic polymer having a molecular weight of at least 00000 g / mol to the suspension to provide a mixture of the microfibrillated cellulose, the uncharged, amphoteric or weakly cationic polymer and the anionic polymer, 1 providing the mixture to a substrate to form a fibrous web,wherein the amount of uncharged, amphoteric or weaklycationic polymer in the mixture is in the range of 0.1 to 20 kg / metric ton based on total dry solid content and wherein the amount of anionic polymer in the mixture is in the range of 0.01 to 10 kg / metric ton based on total dry 20 solid content; and dewatering the fibrous web to form a fibrous product.

Description

technical field [0001] The present invention relates to an improved method of preventing the formation of fiber agglomerates in a suspension comprising microfibrillated cellulose (MFC) and to an improved method of producing a fiber product from a fiber web. Background technique [0002] Manufacturing fibrous products or films from suspensions comprising microfibrillated cellulose (MFC) on a paper machine is very demanding. Problems arise when releasing material from the wire of a paper machine due to low dewatering speeds and the formation of dense fibrous products. There is also the risk that too strong a dewatering can lead to pin-holes in the web, which deteriorate the quality of the product. Another key variable is the formation of the web, which in turn affects the properties of the web. [0003] Various fabrication methods have been proposed to produce MFC or NFC (nanofibrillated cellulose) membranes such as free standing membranes by coating NFC on a plastic carrier...

Claims

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Application Information

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IPC IPC(8): C08L1/02C08J5/18D21H11/18D21H17/28D21H17/32
CPCC08L1/02D21H11/18D21H27/10D21H19/02D21H19/82D21H19/52D21H19/34D21H19/20D21H19/22C08L1/286C08L5/00C08L33/26C08J5/18D21H17/28D21H17/32B32B27/10B32B27/32B32B2307/72D21F1/0027D21H17/42D21H17/45D21H21/08D21H23/04
Inventor K.巴克福克I.海斯卡宁E.绍科宁K.利蒂凯因宁
Owner STORA ENSO OYJ
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