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Board with improved compression strength

A technology of ring pressing and fiberboard, applied in the field of corrugated fiberboard, which can solve the problems of increasing the cost of final products

Pending Publication Date: 2018-11-23
STORA ENSO OYJ
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this results in an increase in the cost of the final product

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0073] The experiment was carried out on a test paper machine. The pulp mix comprised 70% wet hardwood and 30% dry softwood pulp. Refining was at pH 7-8 and after refining the Schobel-Rigler (SR) values ​​were 23-25 ​​for both pulp qualities. The machine speed is 28m / min. The pilot paper machine produced moldable board. The panels were stored at a moisture content of 85% prior to production of the moldable product, and thus this example relates to high moisture performance.

[0074] The weight of fiberboard is 330g / m 2 , and the target thickness is 450 μm.

[0075] The added fixing chemicals were 1 kg / t of wet strength agent (leveling box 1), 2 kg / t of starch (leveling box 3) and 1,5 kg / t of AKD (suction side of the fan pump). The SR value was determined using the ISO5267 / 1 standard.

[0076] Table 1 shows the effect of adding MFC to the pulp. At 50% and 85% relative humidity (RH), the geometric tensile index and fracture tenacity of the MFC-containing paperboard increa...

Embodiment 2

[0080] A pilot paper machine trial was carried out with unbleached kraft pulp having a kappa value of about 72, where an innerliner (simulating the top layer of corrugated board) was produced and typical wet-end chemistry used in the innerliner was used (AKD+Oven treatment, the amount of AKD is 0.02kg / t). The ring pressure index of a conventionally refined virgin fiber with an SR value of 32 was compared with that of a virgin fiber with a reduced refining SR value of 20 added with 2% MFC. The effect on the ring pressure index at higher (85%) relative humidity is shown in Table 2, where the ring pressure index values, especially after a stabilization time of 48 h, were significantly higher than those containing conventionally refined fibers. Paperboard has a high ring pressure index value. The ring pressure index is measured according to ISO 5270.

[0081] Table 2. Effect of less refined fiber and MFC on ring pressure index

[0082]

Embodiment 3

[0084] Moldable product formation tests were carried out using the pulp of Example 2 and 25 kg / t base stock added with microfibrillated cellulose (MFC). The pilot paper machine produced moldable boards and the boards were stored at a moisture content of 85% prior to production of moldable products. The formed moldable product exhibited fewer cracks and defects than a conventionally formed moldable product (without MFC addition and with a higher degree of refining). The results are shown in Table 3.

[0085] table 3

[0086]

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Abstract

A corrugated fiberboard comprising cellulosic fibers, wherein said corrugated fiberboard has at least one of a geometrical tensile index in the range of from 32 to 65 Nm / g, a fracture toughness indexin the range of from 4 to 24 Jm / kg, and a ring crush index in the range of from 5 to 10 Nm / g5 measured at relative humidity of 85% RH; wherein the cellulosic fibers comprises a mixture of less refinedfibers having a Schopper-Riegler (SR) value in the range of 15 to 28 and microfibrillated cellulose fibers, wherein mixture comprises said microfibrillated cellulose in a range of from 1% to 5% by weight of the dry content of the cellulosic fibers.

Description

technical field [0001] This document relates to panels with improved compressive strength at high relative humidity. More particularly, the present disclosure relates to corrugated fiberboard having improved compressive strength and improved compression creep, especially when subjected to high cyclic moisture humidity changes. Background technique [0002] Boxes made of board and corrugated fiberboard (produced from fluting and / or liner), often used in demanding conditions and environments where the moisture content of the air varies from low to high and change at various speeds. In addition to moisture changes, temperatures also vary from very low to quite high. These changes affect the compressive strength and dimensional stability of the board or corrugated fiberboard. [0003] Moisture entering the board by diffusion in a high humidity environment may cause so-called creep when the box is under load or compression and will eventually lead to failure or collapse of the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21H27/40B32B29/08D21H11/18D21H17/25D21H21/16D21H21/18D21H27/10D21H27/38
CPCD21H27/10D21H27/38D21H27/40D21H11/18D21H17/25D21H21/16D21H21/18D21H17/16D21H17/17B32B2307/548B32B29/005B32B2262/062B32B2262/14B32B2307/50B32B2307/54B32B2307/718B32B2307/7246B32B2307/73B32B2307/732B32B2439/62B65D65/403D21H17/62B32B29/08
Inventor I.海斯卡宁S.兰派宁J.坎库宁
Owner STORA ENSO OYJ
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