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Fibrous web of paper or board and method of making the same

A technology of fiber webs and webs, applied in the field of multi-layer cardboard, known to prepare fiber webs, can solve the problems of densification, high drying shrinkage, reduction of paper machine speed and productivity, and increase of energy required for drying. Achieve the effect of less quality change, improved uniformity, and good weight structure

Active Publication Date: 2015-01-21
STORA ENSO OYJ
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0016] 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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  • Fibrous web of paper or board and method of making the same

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Experimental program
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Embodiment Construction

[0048] Foam-forming handsheets of size 38.5 cm x 26.5 cm were prepared by the following procedure: by using a drill (3500 rpm), water was mixed with sodium dodecyl sulfate (SDS) as a surfactant at a ratio of 0.15-0.2 g / l Prepare foam by mixing until the air content in the foam is 60-70%. The target air content of the foam is determined by the foaming device; when the foam reaches the target air content, the level of the foam surface no longer rises, and the mixing begins to reduce the bubble size of the foam. When the foam was ready, a fiber suspension containing CTMP and NFC (Daicel KY-100G, 10.7%) was mixed with the prefabricated foam. Continue mixing until the target air content is reached again. Under steady conditions, the distance between fiber particles in the foam remains constant and no flocculation occurs. Thereafter, the foam was decanted into handsheet molds and filtered through a Fourdrinier screen using an exhauster and vacuum chamber. Fourdrinier wires are of...

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Abstract

The invention relates to a fibrous web product such as paper, and a method for the preparation of such fibrous web. According to the method microfibrillated cellulose (MFC) together with a pulp of a greater fibre length, such as chemithermomechanical pulp (CTMP), are mixed with a foam of water and a sur- factant, 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 the final web product. The method brings a high bulk in combination with a high Scott bond value, to provide improved wet and dry tensile strength for the paper and board products.

Description

[0001] The present invention relates to a process for producing a fibrous web of paper or board, a fibrous web obtained by the process, 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 formed by a foaming process, TAPPI, Janua...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21H11/18D21F11/00B32B29/02D21H21/24D21H21/56B32B7/02C09K23/02
CPCD21H21/24D21F11/002D21H11/18D21H21/56B32B29/02B32B5/26B32B7/02B32B29/005B32B2250/26B32B29/06D21H27/30D21H17/09
Inventor 卡里塔·金努宁图奥莫·耶尔特
Owner STORA ENSO OYJ
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