EP2066839A1 - Process for improving wet strength and paper product with improved wet strength - Google Patents

Process for improving wet strength and paper product with improved wet strength

Info

Publication number
EP2066839A1
EP2066839A1 EP07788783A EP07788783A EP2066839A1 EP 2066839 A1 EP2066839 A1 EP 2066839A1 EP 07788783 A EP07788783 A EP 07788783A EP 07788783 A EP07788783 A EP 07788783A EP 2066839 A1 EP2066839 A1 EP 2066839A1
Authority
EP
European Patent Office
Prior art keywords
paper
wet strength
pigments
accordance
nano
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP07788783A
Other languages
German (de)
French (fr)
Other versions
EP2066839A4 (en
Inventor
Sami Haakana
Irmeli Sinisalo
Päivi SOLISMAA
Matti SIPILÄ
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
UPM Kymmene Oy
Original Assignee
UPM Kymmene Oy
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by UPM Kymmene Oy filed Critical UPM Kymmene Oy
Publication of EP2066839A1 publication Critical patent/EP2066839A1/en
Publication of EP2066839A4 publication Critical patent/EP2066839A4/en
Withdrawn legal-status Critical Current

Links

Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
    • D21H21/14—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by function or properties in or on the paper
    • D21H21/18—Reinforcing agents
    • D21H21/20—Wet strength agents
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
    • D21H17/63—Inorganic compounds
    • D21H17/67—Water-insoluble compounds, e.g. fillers, pigments
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
    • D21H17/63—Inorganic compounds
    • D21H17/67—Water-insoluble compounds, e.g. fillers, pigments
    • D21H17/675—Oxides, hydroxides or carbonates
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
    • D21H21/50—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by form
    • D21H21/52—Additives of definite length or shape

Definitions

  • the invention relates to a process for improving wet strength as defined in the preamble of claim 1 and to a paper product with improved wet strength as defined in the preamble of claim 6.
  • inorganic chemicals have been used as paper fillers in the prior art.
  • the pigments used as fillers are added to the paper pulp. These pigments include, for exam- pie, precipitated calcium carbonate, i.e. PCC, marble, kaoline, talc, specialty pigments, etc. Pigments over the range of for example 1 - 10 ⁇ m are widely used. Fillers are used to improve the optical characteristics of paper and to reduce the amount of fibers, so that paper manufacture costs can be saved.
  • fillers The problem with the addition of fillers is the weakening of the strength properties, such as wet strength, of paper, as a function of the filler content.
  • the strength of paper formed of pure fibers is always superior to the strength of paper compounded with fillers .
  • the objective of the invention is to eliminate the drawbacks referred to above.
  • One specific objective of the invention is to disclose a novel process for improving the wet strength of paper, and a novel paper product with improved wet strength.
  • the invention is based on a process for improving the wet strength of a paper product.
  • pigments with the particle size of 200nm or less are used at least as part of the paper filler.
  • pigments with the particle size of about 150nm are used.
  • nano-sized pigments or, alternatively, also other pigments in addition to nano-sized pigments can be used as the filler.
  • the amount of the nano-sized pigments used is preferably ⁇ 50% by weight of the total amount of the filler. In an alternative embodiment, the amount of nano-sized pigments is more than 50% by weight of the total amount of the filler.
  • nano PCC pigments i.e. nano-sized precipitated calcium carbonate pigments
  • nano-sized pigments are used as nano-sized pigments either alone or together with other pigments.
  • any suitable nano-sized pigment or pigments known per se can be used in the process in accordance with the invention.
  • the nano- sized pigments are added to the paper pulp, preferably just before making the paper.
  • the paper pulp may be any paper pulp, for example chemical or mechanical pulp or recycled pulp.
  • the invention is also based on a paper product which is formed of a fiber-based material.
  • the paper product is provided with improved wet strength and it comprises pigments of less than 200nm in size as the filler.
  • paper product means any fiber product, such as paper, board or a similar product .
  • the invention provides paper with improved wet strength.
  • the invention also provides an improved formation of fiber-fiber bonds and reduces steric hindrance. Thanks to the invention, the running speed can be increased in the paper machines .
  • the size of the nano PCC particles was about 150nm, and the size of the SPCC and the RPCC particles was about 2 - 3 ⁇ m.
  • the retention agent used in the sample points was Percol 47, its amount being constant.
  • the starch used was [Hi-Cat 5163 AM] by Roquette.
  • test 1 No starch was used in test 1 in accordance with the invention.
  • normal RPCC was replaced by nano PCC.
  • Figs. 1 - 4 show the tensile index (Fig. 1) , the tensile stiffness index (Fig. 2), the TEA index (Fig. 3) and the stretch (Fig. 4) in relation to the solids contents.
  • the re- suits provide information about the wet strength of the paper.
  • test data is shown in Table 2.
  • the retention agent used in the sample points was Percol 47, its amount being constant.
  • the starch used was [Hi-Cat 5163 AM] by Roquette.
  • tests 1 - 3 in accordance with the invention normal RPCC was replaced by nano PCC, and in test 4 in accordance with the invention, both SPCC and RPCC were replaced by nano PCC.
  • Figs. 5 - 8 show the tensile index (Fig. 5) , the tensile stiffness index (Fig. 6) , the TEA index (Fig. 7) and the stretch (Fig. 8) in relation to the solids contents.
  • test 4 When only nano-sized pigments (test 4) were used as the filler in the paper pulp, the wet strength was increased even more in relation to the reference sheets. However, it is not necessary to use only nano- sized pigments in order to obtain the optimal wet strength and other properties for paper.
  • the process in accordance with the invention is suitable, in different embodiments, for use in the manufacture of different paper products from different paper pulps .

Landscapes

  • Chemical & Material Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Paper (AREA)

Abstract

The invention relates to a process for improving the wet strength of a paper product and to a paper product with improved wet strength. In accordance with the invention, pigments of less than 200nm in size are used as the filler in the paper product.

Description

PROCESS FOR IMPROVING WET STRENGTH AND PAPER PRODUCT WITH IMPROVED WET STRENGTH
FIELD OF THE INVENTION The invention relates to a process for improving wet strength as defined in the preamble of claim 1 and to a paper product with improved wet strength as defined in the preamble of claim 6.
BACKGROUND OF THE INVENTION
In the field of paper manufacture, mainly inorganic chemicals have been used as paper fillers in the prior art. The pigments used as fillers are added to the paper pulp. These pigments include, for exam- pie, precipitated calcium carbonate, i.e. PCC, marble, kaoline, talc, specialty pigments, etc. Pigments over the range of for example 1 - 10 μm are widely used. Fillers are used to improve the optical characteristics of paper and to reduce the amount of fibers, so that paper manufacture costs can be saved.
The problem with the addition of fillers is the weakening of the strength properties, such as wet strength, of paper, as a function of the filler content. The strength of paper formed of pure fibers is always superior to the strength of paper compounded with fillers .
It is commonly known in the field that the poor wet strength of paper which contains fillers is caused by blocking of hydrogen bond formation. It is also known that the strengths of wet web are increased by surface tension and friction. On the other hand, if the fiber surface is coated, the hydrogen bonds are not formed. OBJECTIVE OP THE INVENTION
The objective of the invention is to eliminate the drawbacks referred to above. One specific objective of the invention is to disclose a novel process for improving the wet strength of paper, and a novel paper product with improved wet strength.
SUMMARY OF THE INVENTION
The process and the product in accordance with the invention are characterized by what has been presented in the claims .
The invention is based on a process for improving the wet strength of a paper product. In accordance with the invention, pigments with the particle size of 200nm or less are used at least as part of the paper filler.
In one embodiment of the invention, pigments with the particle size of about 150nm are used.
In one embodiment, only nano-sized pigments, or, alternatively, also other pigments in addition to nano-sized pigments can be used as the filler. In one embodiment, the amount of the nano-sized pigments used is preferably < 50% by weight of the total amount of the filler. In an alternative embodiment, the amount of nano-sized pigments is more than 50% by weight of the total amount of the filler.
In one embodiment of the invention, nano PCC pigments, i.e. nano-sized precipitated calcium carbonate pigments, are used as nano-sized pigments either alone or together with other pigments. In an alternative embodiment, any suitable nano-sized pigment or pigments known per se can be used in the process in accordance with the invention.
In one embodiment of the invention, the nano- sized pigments are added to the paper pulp, preferably just before making the paper. The paper pulp may be any paper pulp, for example chemical or mechanical pulp or recycled pulp.
When pigment particles are small in diameter, less than 200nm, they do not interfere so much with the wet strength of paper. Furthermore, in the process in accordance with the invention, the nano-sized pigments adhere to the fiber surface, thereby increasing the friction. In this way, the wet strength is increased by using nano-sized pigments. The invention is also based on a paper product which is formed of a fiber-based material. In accordance with the invention, the paper product is provided with improved wet strength and it comprises pigments of less than 200nm in size as the filler. In this context, paper product means any fiber product, such as paper, board or a similar product .
The invention provides paper with improved wet strength. The invention also provides an improved formation of fiber-fiber bonds and reduces steric hindrance. Thanks to the invention, the running speed can be increased in the paper machines .
DETAILED DESCRIPTION OF THE INVENTION In the following section, the invention will be described by means of detailed examples of its embodiments with reference to the accompanying drawings 1 - 8, which show the test results obtained by the process in accordance with the invention.
Example 1
The wet strength of paper was examined in the test series of this example. Fine paper sheets of 80g/m2 in accordance with the invention, in which sheets nano PCC was used as pigment together with normal SPCC, and reference sheets of 80g/m2, in which sheets a normal PCC mixture of 65% SPCC and 35% RPCC was used, were prepared for the test series. The size of the nano PCC particles was about 150nm, and the size of the SPCC and the RPCC particles was about 2 - 3 μm.
The wet strength properties of the different sheets were tested, and the results obtained from the sheets in accordance with the invention were compared to the results of the reference sheets .
The test data is shown in Table 1.
Table 1
The retention agent used in the sample points was Percol 47, its amount being constant. The starch used was [Hi-Cat 5163 AM] by Roquette.
No starch was used in test 1 in accordance with the invention. In the test in accordance with the invention, normal RPCC was replaced by nano PCC.
In the test series, several wet strength tests in accordance with reference tests 1 and 2 and test 1 were conducted with different solids contents. The results are presented in Figs. 1 - 4. Figs. 1 - 4 show the tensile index (Fig. 1) , the tensile stiffness index (Fig. 2), the TEA index (Fig. 3) and the stretch (Fig. 4) in relation to the solids contents. The re- suits provide information about the wet strength of the paper.
One can conclude from the figures that the tensile index, the tensile stiffness index, the TEA index and the stretch are considerably increased when normal fillers are replaced by nano PCC. These improvements in strength are achieved without any use of starch.
From the tests, one can conclude that the use of nano-sized PCC as part of the filler clearly improves the wet strength properties of paper.
In the 0-tests shown in the figures, substantially no fillers were added to the paper pulp.
Example 2
In this test series, the wet strength of a paper sheet in accordance with the invention was examined with respect to the reference sheets.
In the test series, substantially an equal amount of pigment by weight was used in the paper pulp in accordance with the invention as in the reference pulp. Fine paper sheets and reference sheets in accordance with example 1 were prepared in the test series.
The wet strength properties of the different sheets were tested, and the results obtained from the sheets in accordance with the invention were compared to the results of the reference sheets.
The test data is shown in Table 2.
Table 2
The retention agent used in the sample points was Percol 47, its amount being constant. The starch used was [Hi-Cat 5163 AM] by Roquette. In tests 1 - 3 in accordance with the invention, normal RPCC was replaced by nano PCC, and in test 4 in accordance with the invention, both SPCC and RPCC were replaced by nano PCC.
The test series, several wet strength tests in accordance with reference tests 1 and 2 and tests 1 - 4 were conducted with different solids contents . The results are presented in Figs. 5 - 8. Figs. 5 - 8 show the tensile index (Fig. 5) , the tensile stiffness index (Fig. 6) , the TEA index (Fig. 7) and the stretch (Fig. 8) in relation to the solids contents.
One can conclude from the figures that the tensile index, the tensile stiffness index, the TEA index and the stretch are considerably increased when normal fillers are replaced by nano PCC. In this test series, the wet strengths obtained for the paper made from the paper pulp in accordance with the invention were even doubled as compared to the reference.
When only nano-sized pigments (test 4) were used as the filler in the paper pulp, the wet strength was increased even more in relation to the reference sheets. However, it is not necessary to use only nano- sized pigments in order to obtain the optimal wet strength and other properties for paper.
In the 0-tests shown in the figures, substan- tially no fillers were added to the paper pulp.
From the tests, one can conclude that the use of nano-sized PCC as part of the filler or entirely as the filler clearly improves the wet strength properties of paper.
The process in accordance with the invention is suitable, in different embodiments, for use in the manufacture of different paper products from different paper pulps .
The embodiments of the invention are not limited to the examples referred to above; instead many variations are possible within the scope of the accom- panying claims.

Claims

1. A process for improving the wet strength of a paper product, charac teri z ed in that pigments of less than 200nm in size are used at least as part of the paper filler.
2. The process in accordance with claim 1, charac teri z ed in that pigments of less than 150nm in size are used as paper filler.
3. The process in accordance with claim 1 or 2, charac ter i z ed in that nano PCC pigments are used as paper filler.
4. The process in accordance with any one of claims 1 - 3, characteri z ed in that the nano- sized pigments are added to the paper pulp.
5. The process in accordance with any one of claims 1 - 4, charac teri z ed in that the nano- sized pigments are added to the paper pulp just before making the paper.
6. A paper product formed of a fiber-based material , charact eri z ed in that the paper product comprises pigments of less than 200nm in size, and the paper product has an improved wet strength.
7. The product in accordance with claim 6, charac teri z ed in that the paper product comprises pigments of less than 150nm in size.
8. The product in accordance with claim 6 or 7, characteri zed in that the paper product comprises nano PCC pigments.
EP07788783A 2006-07-07 2007-07-03 Process for improving wet strength and paper product with improved wet strength Withdrawn EP2066839A4 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI20060664A FI123480B (en) 2006-07-07 2006-07-07 Procedure for improving wet strength and paper product with improved wet strength
PCT/FI2007/050408 WO2008003827A1 (en) 2006-07-07 2007-07-03 Process for improving wet strength and paper product with improved wet strength

Publications (2)

Publication Number Publication Date
EP2066839A1 true EP2066839A1 (en) 2009-06-10
EP2066839A4 EP2066839A4 (en) 2012-08-15

Family

ID=36758270

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07788783A Withdrawn EP2066839A4 (en) 2006-07-07 2007-07-03 Process for improving wet strength and paper product with improved wet strength

Country Status (3)

Country Link
EP (1) EP2066839A4 (en)
FI (1) FI123480B (en)
WO (1) WO2008003827A1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8808503B2 (en) * 2009-02-02 2014-08-19 John Klungness Fiber loading improvements in papermaking

Citations (3)

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US4963604A (en) 1987-06-11 1990-10-16 Protein Technologies International, Inc. Polymeric pigments used in paper coating compositions and a process for their preparation
EP0764661A2 (en) 1988-12-19 1997-03-26 Cytec Technology Corp. Microemulsified functionalized polymers
WO2005005726A1 (en) 2003-07-15 2005-01-20 Upm-Kymmene Corporation A method for manufacturing paper and paper

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EP0741821A4 (en) * 1993-12-28 1997-10-22 Little Rapids Corp Disposable filters and manufacturing process
WO1998036127A1 (en) * 1997-02-14 1998-08-20 Cytec Technology Corp. Papermaking methods and compositions
FI105052B (en) 1998-07-08 2000-05-31 Valmet Corp Process for making paper, apparatus for carrying out the process and a paper product made by the process
FR2826950B1 (en) * 2001-07-04 2004-09-10 Solvay PROCESS FOR OBTAINING PRECIPITED CALCIUM CARBONATE PARTICLES STRUCTURED ON THE NANOMETRIC SCALE
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Publication number Priority date Publication date Assignee Title
US4963604A (en) 1987-06-11 1990-10-16 Protein Technologies International, Inc. Polymeric pigments used in paper coating compositions and a process for their preparation
EP0764661A2 (en) 1988-12-19 1997-03-26 Cytec Technology Corp. Microemulsified functionalized polymers
WO2005005726A1 (en) 2003-07-15 2005-01-20 Upm-Kymmene Corporation A method for manufacturing paper and paper

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Title
HORIBA INSTRUMENTS: "A Guidebook to Particle Size Analysis", HORIBA INSTRUMENTS, 2012, pages 1 - 32, XP055060732, Retrieved from the Internet <URL:http://www.horiba.com/fileadmin/uploads/Scientific/eMag/PSA/Guidebook/pdf/PSA_Guidebook.pdf>
RAWLE A.: "BASIC PRINCIPLES OF PARTICLE SIZE ANALYSIS", MALVERN INSTRUMENTS LIMITED, 1 January 2008 (2008-01-01), XP055009141, Retrieved from the Internet <URL:http://www.rci.rutgers.edu/~moghe/PSD20%Basics.pdf>
See also references of WO2008003827A1
STRUTZ M.D. ET AL: "ADVANTAGES OF BLENDING ULTRAFINE GROUND LIMESTONE AND SCALENOHEDRAL PRECIPITATEDCALCIUM CARBONATE AS FILLER FOR ALKALINE PAPERS", ABSTRACT BULLETIN OF THE INSTITUTE OF PAPER CHEMISTRY, vol. 59, no. 3, 1 September 1988 (1988-09-01), XP000026396

Also Published As

Publication number Publication date
EP2066839A4 (en) 2012-08-15
FI20060664A0 (en) 2006-07-07
FI123480B (en) 2013-05-31
WO2008003827A1 (en) 2008-01-10
FI20060664L (en) 2008-01-08

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