Hydrophobically sized fibrous web and a method for the preparation of a sized web layer

一种纤维幅材、施胶层的技术,应用在化学仪器和方法、非纤维浆添加、纤维原料处理等方向,能够解决致密化高干燥收缩、增加干燥所需能量、降低造纸机速度和生产力等问题,达到品质变化少、改善均匀性、好克重构造的效果

Active Publication Date: 2015-01-14
STORA ENSO OYJ
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0017] However, the disadvantages that accompany MFC are densification and high drying shrinkage of the paper, and the tendency of MFC to absorb and retain large amounts of water, which increases the energy required for drying and reduces paper machine speed and productivity
For these reasons, MFC has not gained widespread use in the paper industry so far.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0060] The device is as follows:

[0061] AKD (Precis 900 Liquid AKD, supplied by Ashland) was used as a surfactant precursor. AKD was activated in KOH / ethanol / water solution using a 100 min protocol. This protocol gives 0.15% ethanol, and 1.5% ethanol as a by-product in the following pulp, and the pulp will be slightly alkaline due to residual KOH. Before foaming, the pH was adjusted to 8 with dilute hydrochloric acid.

[0062] A pulp of 2% dry solids consistency was prepared from 16% bleached birchwood pulp by dilution with tap water. Tap water was used to simulate realism and to account for calcium-soap precipitation of Ca / Mg ions in water with a hardness of about 3-4 dems.

[0063] 0.01 g of activated ADK-surfactant was added in amounts of 0.01 g per 100 ml of diluted pulp and 0.1 g per 100 ml of diluted pulp.

[0064] 200 ml of the obtained pulp and surfactant mixture were foamed by mixing at full speed in a food-type mixer for 1 minute and transferred directly to a 1...

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Abstract

The invention relates to a hydrophobically sized fibrous web layer, methods for the preparation of a fibrous web or a fibre-based coating, a multilayer board product having at least a middle layer formed of said fibrous web, as well as use of a heat-sensitive surfactant for said methods and products. According to the method microfibrillated cellulose (MFC) and hydrophobic size are brought to a foam with water and the heat- sensitive surfactant, the foam is supplied to a forming fabric of a paper or board machine, dewatered by suction of air through the forming fabric, and dried to a web product. Alternatively the foam may be supplied onto a premade fibrous web and dried to form a coating layer. To prevent gradual degradation of the hydrophobic sizing the hydrophilic functionality of the surfactant contained in the web is finally destroyed by heating. The method uses e.g. AKD-based surfactants with a hydrophilic moiety which is decomposed by heat. If pulp of a greater fibre length, such as CTMP, is also included, a high bulk in combination with a high Scott bond value is achieved, to provide improved wet and dry tensile strength for the paper and board products.

Description

[0001] The present invention relates to a method for producing a hydrophobically sized layer of a fibrous web, a hydrophobically sized fibrous web obtainable by said method, and a multilayer paperboard comprising such a web as at least one layer. As a particular aspect, foaming techniques are used in the present invention to prepare the fibrous web. Background of the invention [0002] In the paper industry, foam technology has been used both in the web forming process and in the web coating process, where the foam is used as the carrier phase of the material. This technique is described, for example, in the following publications: Radvan, B., Gatward, A.P.J., The formation of wet-laid webs by a foaming process, Tappi, Vol. 55 (1972) p. 748; Wiggins Teape Research and Development Ltd. report, New process uses foam in papermaking instead of avoiding it, Paper Trade Journal, 29 November 1971; and Smith, M.K., Punton, V.W., Rixson, A.G., The structure and properties of paper for...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21H21/24D21F11/00B32B29/02D21H11/18D21H21/56
CPCD21H17/17D21H21/24D21H11/18D21H21/56B32B29/02D21F11/002D21H21/16B32B29/06D21H27/30D21H11/02D21H17/22
Inventor 伊斯托·海斯卡宁卡里塔·金努宁图奥莫·耶尔特
Owner STORA ENSO OYJ
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