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Paper or paperboard product and a process for production of a paper or paperboard product

a technology product, applied in the field of paper or paperboard products, can solve the problem of not increasing the density of the product as much as expected, and achieve the effect of good strength properties and high retention of polymers

Inactive Publication Date: 2013-07-18
STORA ENSO OYJ
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention relates to a paper or paperboard product with improved strength and maintained or reduced density. This is achieved by adding cationic polymer and anionic polymer to a furnish that also includes microfibrillated cellulose. The amount of cationic polymer can reach 1.5% by weight of the furnish, while the amount of anionic polymer can reach 8% by weight. This combination of polymers and microfibrillated cellulose results in a strong paper or paperboard with reduced density. The addition of polymers and microfibrillated cellulose can be done separately or all in one step, but it is preferred to add the polymers and microfibrillated cellulose separately to increase the strength without affecting the bulk of the product.

Problems solved by technology

Furthermore, even though the strength of the product increases, it has been shown that the density of the product is not increased as much as expected.

Method used

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Examples

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Effect test

example

Material Used:

[0047]Chemo thermo mechanical pulp (CTMP) at 500 CSF.

[0048]Microfibrillated cellulose (MFC) was prepared by refining bleached softwood kraft pulp of 4% consistency with edge load of 2 Ws / m to 28 SR. The pulp were thereafter enzymatically treated with Endoglucanase (Novozym 476) with the activity of 0.85 ECU / g. The enzymes were dosed to the pulp and which thereafter was treated at 50° C. for 2 hours, at pH 7. After the enzymatic treatment, the pulp was washed and enzymes were deactivated at 80° C. for 30 min. The pulp was thereafter refined once more to 90-95 SR and the refined pulp was then fluidized (Microfluidizer, Microfuidics corp.) by letting pulp of 3% consistency pass through a 400 μm chamber followed by a 100 μm chamber wherein the MFC used were formed.

[0049]Starch used was cationized starch, Raisamyl 70021, Ciba (now BASF),

[0050]CMC used was FinnFix30, CP-Kelco

[0051]C-PAM used was Percol 292 NS, Ciba (now BASF),

[0052]BMA used was Eka NP495, Eka Chemicals,

Proce...

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Abstract

The present invention relates to a paper or paperboard product comprising a furnish wherein said furnish comprises a cationic polymer in an amount of above 1.5% by weight, an anionic polymer and microfibrillated cellulose. The invention further relates to a process for the production of said product.

Description

FIELD OF THE INVENTION [0001]The present invention relates to a paper or paperboard product comprising a furnish which furnish comprises a cationic polymer, an anionic polymer and microfibrillated cellulose.BACKGROUND [0002]In papermaking processes there is an ongoing concern to find ways to produce paper or paperboard at reduced cost without impairing the properties of the product, e.g. without decreasing the mechanical properties such as strength of the product. This could be done by process optimization or by using alternative low cost raw materials and hence gradually replace the rather expensive wood based fiber.[0003]One way to reduce cost of a paper or paperboard product is to increase filler content of the product and thus be able to reduce the amount of fibers used in the paper or paperboard. Besides being economically beneficial, fillers also improve the opacity and printability properties of the product. However, it requires that the cost of the filler is substantially lo...

Claims

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Application Information

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IPC IPC(8): D21H17/24
CPCD21H11/18D21H11/20D21H17/25D21H17/24D21H17/42D21H17/44D21H21/18D21H17/29D21C9/007D21H17/20D21H21/00
Inventor AXRUP, LARSHEISKANEN, ISTOBACKFOLK, KAJRIIKONEN, MIKA
Owner STORA ENSO OYJ
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