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Wet-laid sheets of microfibrillated material components

A technology of microfibrillation and material composition, applied in fiber raw material treatment, non-fibrous pulp addition, post-treatment modification of cellulose pulp, etc., can solve problems such as high production costs and achieve excellent running properties

Active Publication Date: 2017-09-29
STORA ENSO OYJ
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Furthermore, relatively high production costs are involved in the manufacture of conventional wet towels / handkerchiefs, and the airlaid web is usually bonded with expensive adhesives

Method used

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  • Wet-laid sheets of microfibrillated material components
  • Wet-laid sheets of microfibrillated material components
  • Wet-laid sheets of microfibrillated material components

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0127] The MFC from wet bleached pine is manufactured using a conventional MFC manufacturing system. Examples of such systems are the acid hydrolysis of cellulosic materials, such as disclosed in WO 2009021687A1, or MFC suspensions produced by enzymatic hydrolysis of kraft cellulose, such as disclosed in WO2011004300A1, acid hydrolysis followed by high pressure homogenization, For example, it is disclosed in US20100279019, or by any other method known to the skilled person. Microfibrils can thus be released from untreated or pretreated fibers by using mechanical forces such as refiners, extruders, homogenizers or pulverizers. The concentration of MFC in this suspension is usually about 1-6% and the remainder is water. Ionic liquids can also be used to produce microfibrillated cellulose.

[0128] In this embodiment, the raw material is bleached pine pulp that has never been dried and is pretreated with an enzymatic method. The measured SR value is> 93SR, that is, extremely high...

Embodiment 2

[0169] In the following examples, a 3-layer laminate of MFC (air-dried) was manufactured and tested.

[0170] ‐Spray some water to the top of the glass plate

[0171] -Place 3 wet sheets (about 50gsm each) on the surface of the board so that good contact between the glass and the wet sheet is obtained.

[0172] -Use some small pressure to ensure good contact between the sheets, resulting in a laminate structure

[0173] ‐Dry the laminated structure of 3 sheets

[0174] -Very good contact with the glass is maintained during drying and no drying shrinkage or very small drying shrinkage occurs due to the adhesion between the glass and the wet sheet

[0175] -Obtain a very smooth and visually attractive surface and surface appearance, which is also expected to be a very good or close to perfect printing surface

[0176] ‐ Use some force to peel off the 3-sheet laminate

[0177] ‐The laminate perfectly replicates the texture of the glass plate, in which all the small details are copied

[0178] ...

Embodiment 3-5

[0202] ‐3) Wet handkerchiefs pressed into disc form

[0203] o Compression is carried out in a wet / never dried form because the compression is hot (> 100℃), the wet handkerchief will dry and acquire a permanent shape during pressing

[0204] ■Because of the large breaking elongation, it can be made into a more difficult form (compared to the usual paper / board)

[0205] -4) Tube formed by wet handkerchief

[0206] o Wrap a wet handkerchief around the tube and let it dry

[0207] o Obtain extremely light weight and strong tube

[0208] ‐5) Wrap the wet handkerchief around the wood saw block and dry it

[0209] o Form a very good surface, easy to paint surface

[0210] o The wet handkerchief adheres very well to the wood surface

[0211] These Examples 3-5 are respectively reflected in Figure 3-5 in.

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Abstract

A wet-laid sheet formed from a fibrous web, characterized in that the initial fibrous web contains >50% calculated dry microfibrillated material content, by weight of the total fibrous material content in said web, wherein said fibrillated material The composition has an SR value >70; and is characterized by a moisture content in the sheet of >30 wt.-%.

Description

Technical field [0001] This document relates to wet-laid sheets of microfibrillated material components (compositions). More specifically, the present disclosure relates to a method of forming the sheet and its use. Background technique [0002] Tissues such as wet or damp hand towels (also called wet wipes, wet towels or wet handkerchiefs) are usually small wet pieces of paper or cloth, which are often folded and individually packaged for convenience appear. These are used for personal hygiene, cleaning or household cleaning. [0003] Generally, the base material is produced as air-laid paper (dust-free paper), where fibers are carried by air and formed into the structure of the paper. Manufacturing technologies include wet-laid non-woven fabrics, melt-spun webs, dry-laid webs, needle felts and other technologies. Each of these techniques can be used alone or in a composite structure. These products are available in multi-fiber chemicals (cotton, wood pulp, polyester, polypro...

Claims

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Application Information

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IPC IPC(8): D21H11/18A61F13/15
CPCD21H11/18D21H27/002D21H17/675D21H27/10A61F13/15D21H5/14D21H21/14D21F11/00A47L13/16
Inventor I.海斯卡嫩N.鲁奥尼米V.勒皮斯托J.图奥梅拉S.塔皮奥T.朱尔瓦嫩P.苏奥嫩
Owner STORA ENSO OYJ
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