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Method of producing boards

A technology of cardboard and fiber paper web, applied in the field of cardboard manufacturing, to achieve the effects of saving chemical consumption, reducing energy consumption, and improving forming consistency

Inactive Publication Date: 2017-05-24
美真纸板有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In particular, the present invention solves the problem of manufacturing paperboard products where a high bulk ply is desired which simultaneously exhibits good internal strength properties (e.g. by at least one of improved Scott Bond and improved strength in the z-direction). as evidenced by

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0085] The invention has been tested under laboratory conditions. figure 2 Contains a table with bulk and Scott Bond values ​​for the middle ply of folding boxboard obtained from the tests.

[0086] According to a preferred embodiment for manufacturing the paperboard of the invention, the fibrous material and nanocellulose mixture are mixed with a prefabricated foam made using polyvinyl alcohol. The foam typically has an air content of about 60% to 70% from which the fibrous foam is made (for example by pumping the foam through a wire). Excellent formation is achieved because in a stable foam the particles are kept at a distance and flocculation does not occur. After the web is formed, the fibrous web is dried, eg by sucking air through the web (eg using a suction slit).

[0087] Tests of different embodiments of the invention using different polyvinyl alcohol grades as blowing agents to maximize the benefits of polyvinyl alcohol have shown that, on a laboratory scale, for ...

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Abstract

The present invention concerns a method for producing a board, wherein a foamed fibrous layer is formed by contacting foam forming of a fibrous slush and said foamed fibrous layer is dried to form a web, wherein polyvinyl alcohol is used as a foaming agent in foam forming. The invention also concerns a system for producing a board and a board with at least one dried foamed fibrous layer, wherein the foamed fibrous layer is made from a mixture of fibrous slush with foam formed from water and polyvinyl alcohol.

Description

technical field [0001] The present invention relates to a method of manufacturing paperboard (hereinafter also referred to as "fibrous web") by foam forming. The method is suitable for forming various products of paperboard material and is particularly suitable for the manufacture of high bulk cartonboard products such as folding box board or white pulp lined chipboard. The invention also relates to the paperboard thus obtained. Background technique [0002] Fibrous webs can be produced by foam forming, which has many advantages. In foam, the fibers do not flocculate. When the web is made from fibrous foam that has been dewatered, for example by applying suction to the foam through a wire, the fibers will retain their unflocculated state and form a web with good formation. The structural pressure that the foam exerts on the structure when water is removed by suction is much less than the pressure exerted by conventional water removal from fibrous slush. This technology...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21F11/00D21H17/20D21F9/00D21H21/22D21H21/56
CPCD21F9/006D21F11/002D21H17/36D21H21/56D21F11/00D21H17/20D21H21/22D21F11/12D21H17/24
Inventor K.金努恩T.赫杰特
Owner 美真纸板有限公司
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