Method for manufacturing nanofibrillated cellulose pulp and use of the pulp in paper manufacturing or in nanofibrillated cellulose composites

A cellulose and pulp technology, applied in the fields of cellulose pulp post-treatment, cellulose pulp post-treatment modification, pulp beating/refining methods, etc.

Inactive Publication Date: 2012-09-19
UPM-KYMMENE OYJ
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For example, known additives are usually only used in the refining stage, which leads to additional additive costs

Method used

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  • Method for manufacturing nanofibrillated cellulose pulp and use of the pulp in paper manufacturing or in nanofibrillated cellulose composites
  • Method for manufacturing nanofibrillated cellulose pulp and use of the pulp in paper manufacturing or in nanofibrillated cellulose composites
  • Method for manufacturing nanofibrillated cellulose pulp and use of the pulp in paper manufacturing or in nanofibrillated cellulose composites

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Embodiment approach

[0034] According to one embodiment of the invention, the method comprises a step wherein at least one type of optical brightener (OBA) is added to the cellulose-containing pulp as a refining additive. In this method, the addition is preferably carried out before the pre-refining and / or fibrillation stage. Additionally or alternatively, a type of optical brightener may be added to the pulp during the pre-refining or fibrillation stage. Thus, it is possible to add optical brighteners in the pre-refining stage, and / or optical brighteners may be added to part or all of the subsequent fibrillation stage. According to an advantageous embodiment of the invention, irrespective of the stage at which the additive is added to the process, the pulp is fibrillated in at least one fibrillation stage after the addition of the additive.

[0035] Anionic optical brighteners are able to inhibit the hydrogen bonding between cellulose fibrils in cellulose and thus can be used to create a dispers...

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Abstract

The invention relates to a method for manufacturing pulp. The manufactured pulp contains at least 30 w-% nanofibrillated cellulose material measured from the dried pulp. The method comprises the following stages: introducing raw material to a system which raw material includes cellulose, dosing at least one type of an optical brightening agent as a refining additive to the system, and refining the raw material in the presence of the dosed optical brightening agent in at least one pre-refining stage or fibrillation stage in order to form fibrillar cellulose material. The invention further relates to a use of the produced pulp in nanofibrillated cellulose composites or in paper or paperboard manufacturing including base paper production and finishing stages, including, for example, paper and paperboard coatings.

Description

technical field [0001] The present invention relates to a method for producing nanofibrillated cellulose pulp. The invention also relates to the use of pulp in papermaking or nanofibrillated cellulose composites. Background technique [0002] Many stages of pulp production, especially refining, consume large amounts of energy. The production of nanofibrillated cellulose is especially energy-intensive due to the several fibrillation pathways necessary to obtain nano-sized materials. Since the energy consumption of the produced pulp is greatly increased when the produced pulp comprises nanofibrillated cellulose, there may be efficiency problems when the produced pulp consists at least partly of nanofibrillated cellulose. Another problem sometimes in the production of nanofibrillated cellulose pulp is poor water removal due to several strong bonds between the cellulose fibers and the water to be removed. [0003] Due to the problems mentioned above, it is beneficial to add a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21H11/18D21H21/30D21H21/32D21D1/20D21C9/00
CPCD21H21/30D21H21/32D21H11/18D21C9/005D21D1/20D21H17/42
Inventor M.诺波南T.派瓦莱南A.劳卡南J.帕尔塔卡里
Owner UPM-KYMMENE OYJ
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