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In-line production method for papermaking process

A production method and additive technology, applied in papermaking, textiles and papermaking, paper, etc., can solve the problems of reduced tensile strength and tensile stiffness, poor retention, and increased wear of paper, and improve whiteness and printability. , Control the effect of drying shrinkage

Active Publication Date: 2018-10-30
STORA ENSO OYJ +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For this reason, the tensile strength and tensile stiffness of the paper are reduced and, moreover, linting can occur during printing
In addition, wear on the paper machine can be increased due to fillers
They also hold rather poorly and can cause two-sidedness on paper

Method used

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  • In-line production method for papermaking process
  • In-line production method for papermaking process
  • In-line production method for papermaking process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0085] Trials were carried out in a pilot paper machine. The objective of this test is to simulate the face ply of multi-ply paperboard.

[0086] Supplies are 100% bleached birch wood refined to 26SR grade. The running speed was 80m / min and the grammage was 65gsm. Conventional paper chemicals used in board production, such as retention chemicals, hydrophobic sizing agents, etc., are used. These parameters were kept constant during the experiment.

[0087] Table 1 below shows an overview of how the test was performed and the chemicals used therein.

[0088] The addition of CMC (carboxymethyl cellulose) was not necessary, however, a slight improvement in strength could be noticed. However, CMC had no adverse effect on thread retention and brightness.

[0089] Starch is usually added as it imparts some strength without major adverse effects.

[0090] In Example 1, the mixing of MFC and starch into milk of lime was carried out and its ingredients were added or introduced int...

Embodiment 2

[0099] Example 2 shows that if the addition of MFC and starch substitute is compounded into a thick stock, much higher amounts are required for the same strength level and high porosity is lost. A Gurley hill porosity of 31 s / 100ml indicates the low porosity of the paper layer.

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Abstract

In-line production process for providing a liquid stream of at least one additive in a short cycle by feeding it into the liquid stream of a short cycle and entering papermaking stock of a web machine In a liquid stream, wherein the appropriate amount of microfibrillated cellulose or nanofibrillated polysaccharide is provided substantially simultaneously with the liquid stream feeding said at least one additive.

Description

technical field [0001] The present invention relates to a method for an in-line production process for paper and board manufacturing processes and for the simultaneous delivery of microfibrillated cellulose and at least one additive in short cycles of the paper manufacturing process. More specifically, this paper concerns the crystallization and precipitation of calcium carbonate during in-line production. Background technique [0002] Fillers are added to papermaking pulp to fill void spaces not occupied by fibers and thereby smoothen the surface of the paper. They improve, for example, the printability, dimensional stability, formation and gloss of paper. In addition to this, the optical properties of paper such as opacity, light scattering and brightness are generally improved since the light scattering coefficient and brightness of fillers tend to be higher than those of pulp. [0003] Fillers are inexpensive compared to wood fibers and are therefore also used in paper...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21H17/70D21H11/18D21H17/25D21H17/67
CPCD21H11/18D21H17/25D21H17/67D21H17/70D21H17/675D21H17/28D21H17/74
Inventor O.伊姆波拉朱尼.马图拉朱希.马图拉K.塔克拉I.海斯坎恩M.瓦凯韦嫩J.拉萨嫩
Owner STORA ENSO OYJ
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