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Plies for cardboard from in-line production methods

A technology for cardboard and paper, applied in the field of layers containing mixed materials, which can solve the problems of reduced tensile strength and tensile stiffness of paper, poor retention, and increased wear

Active Publication Date: 2021-04-20
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
Their retention is usually rather poor and it can lead to two-sidedness on paper

Method used

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  • Plies for cardboard from in-line production methods
  • Plies for cardboard from in-line production methods
  • Plies for cardboard from in-line production methods

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0082] Trials were carried out in a pilot paper machine. The objective of this test is to simulate the face ply of multi-ply paperboard.

[0083] 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.

[0084] Table 1 below shows an overview of how the test was performed and the chemicals used therein.

[0085] 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.

[0086] Starch is usually added as it imparts some strength without major adverse effects.

[0087] 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

[0096] 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 31s / 100ml indicates the low porosity of the paper layer.

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Abstract

Layers for paper and paperboard made from a layer base material, wherein said layer comprises a hybrid material in an amount of 1-25% by weight of said layer, wherein, in an in-line process, said hybrid material is introduced into Into the short-circulation target suspension of the fibrous web forming process of the fibrous web machine, wherein the target suspension forms the layer base material, and the hybrid material comprises fibers or progenitors deposited on nanofibrillated polysaccharides Alkaline earth metal carbonates on or in fibers.

Description

technical field [0001] The present invention relates to layers comprising hybrid materials for paper or paperboard, which are produced by methods used in the in-line production process in the papermaking process. 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 manufacture to reduce the cost of paper raw materials. Furthermore, drying of the filled web requires less energy. Although fillers are inexpensive and have a positive influence on paper properti...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21H11/18D21H17/25D21H17/67D21H17/70
CPCD21H11/18D21H17/25D21H17/67D21H17/70D21H17/675
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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