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Method for manufacturing multi-layered fibrous web and multi-layered fibrous web

A multi-layer fiber and fiber layer technology, which is applied in the direction of secondary cellulose fiber, non-fiber pulp addition, fiber raw material treatment, etc., can solve the problems of impact, drainage and retention rate, etc., to eliminate foaming problems and improve reliability. operational effect

Active Publication Date: 2021-02-19
KEMIRA OY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, anionic strength agents can affect the cationic requirements of the process, so they can have a negative impact on drainage and retention

Method used

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  • Method for manufacturing multi-layered fibrous web and multi-layered fibrous web
  • Method for manufacturing multi-layered fibrous web and multi-layered fibrous web
  • Method for manufacturing multi-layered fibrous web and multi-layered fibrous web

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Effect test

Embodiment approach

[0040] According to one embodiment of the present invention, the synthetic amphoteric polymer composition comprises

[0041] - one or more copolymers of anionic vinyl monomers, cationic vinyl monomers and nonionic vinyl monomers, and / or

[0042] - Combinations of copolymers comprising anionic vinyl monomers and nonionic vinyl monomers with copolymers comprising cationic vinyl monomers and nonionic vinyl monomers.

[0043]The cationic groups in the synthetic amphoteric polymer composition may be derived from 2-(dimethylamino)ethyl acrylate (ADAM), [2-(acryloyloxy)ethyl]trimethylammonium chloride ( ADAM-Cl), 2-(dimethylamino)ethyl acrylate benzyl chloride, 2-(dimethylamino)ethyl acrylate dimethyl sulfate, 2-dimethylaminoethyl methacrylate (MADAM), [2 -(methacryloyloxy)ethyl]trimethylammonium chloride (MADAM-Cl), 2-dimethylaminoethyl methacrylate dimethylsulfate, [3-(acryloylamino)propyl Monomers of ]trimethylammonium chloride (APTAC), [3-(methacrylamino)propyl]trimethylammoniu...

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Abstract

A method for manufacturing a multi-layered fibrous web, which comprises at least two fibrous layers, wherein each of the layer is formed from one or more fibre stocks, the fibrous layers are combinedprior to subjecting the multilayered fibrous web to wet-pressing and drying, and in which method at least one layer of the multi-layered fibrous web is formed from the fibre stock comprising at least50 weight% of chemi-thermomechanical pulp (CTMP), hardwood kraft pulp and / or recycled fibre material calculated from the thick stock applied to the particular layer approach system, and to which fibrestock is added a first strength component and a second strength component, wherein the first strength component is a cationic strength agent and the second strength component comprises a synthetic amphoteric polymer composition having a net charge from -3 to +1 meq / g (dry), at pH 7.

Description

technical field [0001] The invention relates to a method for producing a multilayer web, and a multilayer web according to the preambles of the independent claims presented below. Background technique [0002] Multilayer or multilayer webs comprise at least two fiber layers that are joined together during manufacture. An advantage of this multi-layer fibrous layer construction is the ability, for example, to optimize the properties of the fibers in the different layers to achieve a certain function. This can be achieved, for example, by varying the content and quality of fiber stock in each layer, or by treating the fiber stock to increase strength. [0003] Most properties depend directly or indirectly on the type and properties of the fiber. By mixing mechanical and chemical fibers in multilayer structures, end-use requirements can be tailored to end product properties. Disturbingly, some requirements are completely contradictory, such as obtaining high bulk and strengt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21H11/08D21H11/14D21H17/28D21H17/37D21H17/55D21H21/18D21H21/22D21H27/00D21H27/10D21H27/30
CPCD21H21/18D21H21/22D21H27/30D21H11/08D21H11/14D21H17/28D21H17/375D21H17/55D21H27/005D21H27/10Y02W30/64D21H11/04D21H17/29D21H17/44D21H17/56D21H23/24D21H27/002
Inventor 马蒂·希耶塔涅米阿斯科·卡尔皮尤卡·劳蒂艾宁
Owner KEMIRA OY
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