Unlock instant, AI-driven research and patent intelligence for your innovation.

Method for producing a fibrous product comprising microfibrillated cellulose

A technology of microfibrillation and cellulose, applied in chemical instruments and methods, post-treatment modification of cellulose pulp, layered products, etc.

Active Publication Date: 2022-07-12
STORA ENSO OYJ
View PDF11 Cites 0 Cited by
  • Summary
  • 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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for producing a fibrous product comprising microfibrillated cellulose
  • Method for producing a fibrous product comprising microfibrillated cellulose

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0084] The effect of mixing fiber suspensions in a Diaf mixer on fibril aggregation was investigated in the presence of various additives. The suspension was diluted with RO (reverse osmosis) water to a 1.5 wt% consistency prior to mixing. The initial dispersion (=standard addition mode) is typically achieved by dispersing a set amount of the fiber suspension in a dilute solution of chemical additives using a rod mixer for 30 seconds of dispersion. 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 the 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 premix mode, the chemical additives are mixed together before the fibrils are introduced into the resulting solution using...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
densityaaaaaaaaaa
densityaaaaaaaaaa
diameteraaaaaaaaaa
Login to View More

Abstract

A method of producing a fibrous product from a fibrous web, wherein the method comprises the steps of: - providing a suspension of fibers comprising microfibrillated cellulose, wherein said suspension has a content of microfibrillated cellulose ranging from 60 to 99.9 % by weight, based on total dry solids content, - adding an uncharged, amphoteric or weakly cationic polymer with a molecular weight of at least 50,000 g / mol to the suspension, - adding a polymer with a molecular weight of at least 00,000 g / mol An anionic polymer is added to the suspension to provide a mixture of the microfibrillated cellulose, the uncharged, amphoteric or weakly cationic polymer and the anionic polymer, 1- The mixture is provided to a substrate to form a fibrous web, wherein the amount of uncharged, amphoteric or weakly cationic polymer in the mixture ranges from 0.1 to 20 kg / metric ton, based on total dry solids content , and wherein the amount of anionic polymer in the mixture ranges from 0.01 to 10 kg / metric ton, based on total dry solids 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 fibrous product from a fibrous web. Background technique [0002] The manufacture of fibrous products or films from suspensions containing microfibrillated cellulose (MFC) on a paper machine is very demanding. Problems can arise when releasing material from the wire of a paper machine due to the low dewatering speed and the formation of dense fiber products. There is also a risk that excessive dewatering can lead to pin-holes in the web, which degrade 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 manufacturing methods have been proposed to manufacture MFC or NFC (Nanofibrillated Cellulose) films such as by coating NFC free standing films on plastic suppor...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
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