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AU2007247781A1 - Improved paper dyeing process - Google Patents

Improved paper dyeing process Download PDF

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Publication number
AU2007247781A1
AU2007247781A1 AU2007247781A AU2007247781A AU2007247781A1 AU 2007247781 A1 AU2007247781 A1 AU 2007247781A1 AU 2007247781 A AU2007247781 A AU 2007247781A AU 2007247781 A AU2007247781 A AU 2007247781A AU 2007247781 A1 AU2007247781 A1 AU 2007247781A1
Authority
AU
Australia
Prior art keywords
stock
dye
pulp
pulp stock
paper
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.)
Granted
Application number
AU2007247781A
Other versions
AU2007247781B2 (en
Inventor
Sunil Chopra
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.)
Visy R&D Pty Ltd
Original Assignee
Visy R&D Pty Ltd
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
Priority claimed from AU2006902435A external-priority patent/AU2006902435A0/en
Application filed by Visy R&D Pty Ltd filed Critical Visy R&D Pty Ltd
Priority to AU2007247781A priority Critical patent/AU2007247781B2/en
Publication of AU2007247781A1 publication Critical patent/AU2007247781A1/en
Application granted granted Critical
Publication of AU2007247781B2 publication Critical patent/AU2007247781B2/en
Ceased legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • DTEXTILES; PAPER
    • D21PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21HPULP 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
    • D21H27/00Special paper not otherwise provided for, e.g. made by multi-step processes
    • D21H27/30Multi-ply
    • D21H27/38Multi-ply at least one of the sheets having a fibrous composition differing from that of other sheets
    • DTEXTILES; PAPER
    • D21PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21HPULP 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
    • D21H17/00Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
    • D21H17/03Non-macromolecular organic compounds
    • D21H17/05Non-macromolecular organic compounds containing elements other than carbon and hydrogen only
    • D21H17/09Sulfur-containing compounds
    • DTEXTILES; PAPER
    • D21PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21HPULP 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
    • D21H21/00Non-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
    • D21H21/14Non-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
    • D21H21/28Colorants ; Pigments or opacifying agents
    • DTEXTILES; PAPER
    • D21PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21HPULP 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
    • D21H23/00Processes or apparatus for adding material to the pulp or to the paper
    • D21H23/02Processes or apparatus for adding material to the pulp or to the paper characterised by the manner in which substances are added
    • D21H23/04Addition to the pulp; After-treatment of added substances in the pulp
    • D21H23/06Controlling the addition
    • D21H23/14Controlling the addition by selecting point of addition or time of contact between components

Landscapes

  • Paper (AREA)

Description

WO 2007/128077 PCT/AU2007/000616 IMPROVED PAPER DYEING PROCESS Field This invention relates to the dyeing of paper materials, such as packaging grade paper materials. 5 Background The production of coloured paper for use in packaging can be achieved by printing the paper with a coloured ink followed by varnishing to prevent ink rub-off. While packaging products made from such paper perform acceptably, the process costs are high. The dyeing of paper pulp to obtain fast colours using sulphur-based dyes has been 10 practised for many years. However, the addition of the dye to the paper pulp in the pulper during stock preparation, in which the dye is fixed by the addition of alum, causes colouration of the process water unless pH is lowered to less than 5, which creates environmental as well as other process difficulties. In addition, in the case of paper mills with multi-ply paper making facilities but only one pulper, such dyeing processes mean 15 that the addition of the dye to the pulper would result in dyeing of the whole sheet, even if colour is only required for the outer ply of paper. This results in a significant increase in the cost of dyeing. Summary It is an object of the present invention to provide an alternative dyeing process 20 which removes at least the colouration problem outlined above. The invention provides a process for dyeing paper materials, comprising preparing pulp stock suitable for a paper making process, subjecting the pulp stock to a hot dispersion process, characterised by the steps of adding a sulphur dye to the pulp stock after the hot dispersion process, and acidifying the dyed pulp stock to fix the dye. 25 By addition of the dye to the pulp stock making process after the hot dispersion stage, the contamination of the process water is avoided. In addition, the dye can be added to the stock for producing a selected paper ply, such as the outer ply, rather than dyeing all plies of the paper.
WO 2007/128077 PCT/AU2007/000616 -2 The dye can be added at any suitable time immediately following hot dispersion and may be added just prior to or during the treatment of the pulp by disperser plates, or the like. The pulp stock may be de-watered prior to the hot dispersion step, and is passed 5 through disperser plates, or the like, following hot dispersion. When the pulp stock is passed through the disperser plates, or the like, the pulp stock is diluted to about 5% to 6% stock concentration and the sulphur dye is added at this stage at an addition rate of about 20% to 30%. The dyed pulp stock is then stored in a stock chest for papermaking, and while in the stock chest, the stock is acidified by the addition of a suitable acid, such as 10 dilute sulphuric acid, to increase the pH level to about 5.5 to 6.0. This results in complete fixation of the dye in the fibres of the stock. Since the addition of acid to the sulphur dye results in the formation of hydrogen sulphide gas, the stock chest is preferably covered with a lid and the gas extracted for treatment. 15 In one form, the gas is treated by passing it through another stock tank full of dyed stock prior to acidification. This results in over 90% adsorption of the hydrogen sulphide gas. The vent gas from the top of this tank may be passed through a bed of activated carbon, and this results in about 99% removal of the hydrogen sulphide gas. The pulp from the pulper may be fractionated to produce long fibre stock for the 20 top ply and short fibre stock for the back ply in a two-ply paper. The long fibre fraction may be de-watered by any suitable means, such as a screw press, to about 25% consistency and given hot dispersion by increasing the stock temperature to around 100 0 C by the addition of steam, following which the hot stock is passed through disperser plates in a known manner. The pulp stock fraction is at this time diluted to about 5% stock 25 concentration and the sulphur dye added at this stage following which the stock fraction is stored in a stock chest for paper making. The stock fraction is then acidified as described above to fix the dye and the hydrogen gas removed, such as described above. By operating in this way, the pulp fraction for the outer ply only is dyed thereby resulting in a significant saving in dye costs.
WO 2007/128077 PCT/AU2007/000616 -3 It has been found that the addition of the dye following hot dispersion and dilution to about 5% to 6% stock concentration results in a better yield from dye in terms of colour, and fixing the dye at a higher pH using a stronger mineral acid, rather than alum, is more economical. 5 The process described above is suitable for use with any sulphur dye and has been found to be particularly suitable for use with sulphur black dye, such as Clariant Diresul black P-FT liquid (CI Sulphur Black 1). The invention also provides a dyed paper product made by the process defined above. 10 In the present specification, the paper making process is not described in any detail since any paper making process known to persons skilled in the art may be adopted and modified by a dyeing process embodying the present invention. Example Old corrugated cartons were slushed in a continuous pulper and the pulp was 15 screened through a 3mm screen to remove contaminants. The screened pulp was fractionated through a screen with 0.35mm slots to get two streams of pulp. The rejects fraction of long fibre was used to feed the top wire of a paper machine whereas the accepts fraction (short fibre) was used to feed the bottom wire of the paper machine. The long fibre fraction was dewatered to about 25% consistency in a screw press and the thickened pulp 20 was heated with steam in a hot dispersion unit to around 95 0 C to melt wax, stickies and the like. The heated stock was mixed with water and sulphur black dye in the disperser at about 5% stock concentration. This process broke the waxes and stickies into very small particles and mixed the black dye thoroughly with pulp. The sulphur black dye used was Diresul Black P-FT liquid from Clariant. The characteristics of this dye are as follows: 25 Colour Index: Sulphur Black 1 Specific Gravity: 1.32 g/cc Active Concentration: 35% pH :12 Various amounts of this black dye were added from 20%-30% on a dry fibre basis 30 which equals 200kg dye per ton of fibre to 300kg dye per ton of fibre.
WO 2007/128077 PCT/AU2007/000616 -4 The pulp stock mixed with dye was highly alkaline (pH 10-10.5) and the dye was fixed on the fibre by addition of 50% dilute sulphuric acid to pH of 5.8 while the stock was held in a stock chest. The resulting hydrogen sulphide gas was extracted and neutralised as described above. 5 This pulp was fed to the top ply of two-ply fourdrienier machine running at 330m/min with production rate of 11 t/hr. The black colour of the top side of the paper with varying dosages of black dye was as follows: Sulphur Black dose L* 0% 67 10 20% 23.5 25% 22 30% 21 The L* values go down as the black colour becomes darker. These results show there is very significant drop in L* by addition of 20% dye but further addition in steps of 15 5% reduce L* only marginally, although the dye is still fully fixed on the fibre. The machine wire water did not have black colouration showing complete fixation of dye on fibre. This effect can sometimes be very helpful in grade change of paper on paper machine from one colour to another. The invention has been described by way of non-limiting example only and many 20 modifications and variations may be made thereto without departing from the spirit and scope of the invention. Throughout this specification and the claims which follow, unless the context requires otherwise, the word "comprise", and variations such as "comprises" and "comprising", will be understood to imply the inclusion of a stated integer or step or group 25 of integers or steps but not the exclusion of any other integer or step or group of integers or steps.

Claims (11)

1. A process for dyeing paper materials, comprising preparing pulp stock suitable for a paper making process, subjecting the pulp stock to a hot dispersion process, characterised 5 by the steps of adding a sulphur dye to the pulp stock after the hot dispersion process of the pulp stock making process, and acidifying the dyed pulp stock to fix the dye.
2. The process of claim 1, wherein the dye is added to the pulp stock just prior to or during treatment of the pulp stock by disperser plates or the like, following hot dispersion. 10
3. The process of claim 1 or 2, wherein the pulp stock is de-watered prior to hot dispersion.
4. The process of any preceding claim, wherein the hot dispersed pulp stock is diluted 15 to about 5% to 6% stock concentrate and the sulphur dye is added at an addition rate of about 20% to 30%, following which the pulp stock is stored in a stock chest for paper making where it is acidified to fix the dye.
5. The process of claim 4, wherein acidification increases the pH of the pulp stock to 20 about 5.5 to 6.0.
6. The process of claim 5, wherein the dyed pulp stock is acidified by means of a suitable mineral acid, such as dilute sulphuric acid. 25
7. The process of any one of claims 4 to 6, further comprising the step of extracting hydrogen sulphide gas from the stock chest for treatment.
8. The process of claim 7, wherein the hydrogen sulphide gas is treated by passing the WO 2007/128077 PCT/AU2007/000616 -6 gas through another stock chest prior to acidification to adsorb a substantial portion of the gas.
9. The process of any preceding claim, wherein the pulp stock is fractionated to 5 produce long fibre stock for the top ply of a two-ply paper material, and a short fibre stock for the back ply of the two-ply paper material, and only the long fibre stock is subjected to the dyeing process.
10. A process for dyeing paper material as described in the Example. 10
11. Dyed paper products produced by the process as claimed in any preceding claim.
AU2007247781A 2006-05-09 2007-05-08 Improved paper dyeing process Ceased AU2007247781B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2007247781A AU2007247781B2 (en) 2006-05-09 2007-05-08 Improved paper dyeing process

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
AU2006902435A AU2006902435A0 (en) 2006-05-09 Improved paper dyeing process
AU2006902435 2006-05-09
AU2007247781A AU2007247781B2 (en) 2006-05-09 2007-05-08 Improved paper dyeing process
PCT/AU2007/000616 WO2007128077A1 (en) 2006-05-09 2007-05-08 Improved paper dyeing process

Publications (2)

Publication Number Publication Date
AU2007247781A1 true AU2007247781A1 (en) 2007-11-15
AU2007247781B2 AU2007247781B2 (en) 2011-03-10

Family

ID=38667347

Family Applications (1)

Application Number Title Priority Date Filing Date
AU2007247781A Ceased AU2007247781B2 (en) 2006-05-09 2007-05-08 Improved paper dyeing process

Country Status (4)

Country Link
US (1) US20100126683A1 (en)
AU (1) AU2007247781B2 (en)
NZ (1) NZ560597A (en)
WO (1) WO2007128077A1 (en)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2436883C1 (en) 2008-02-19 2011-12-20 Мидвествако Корпорейшн Method of manufacture of paper-based coloured product and paper-based coloured product
EP2749680A1 (en) 2009-06-09 2014-07-02 Buckeye Technologies Inc. Dyed cellulose comminution sheet, dyed nonwoven material, and processes for their production
CN102877364B (en) * 2012-10-12 2015-04-08 上海典旗材料科技有限公司 Single and double side sizing device for paper dyeing machine
FR2997069B1 (en) * 2012-10-18 2014-12-26 Nicolas Saverino METHOD FOR MANUFACTURING A COLORED TRAY
CN107326724A (en) * 2017-07-13 2017-11-07 何炽斌 A kind of natural fruit is infected with the production method of coloured paper towel
NL2025251B1 (en) * 2020-03-31 2021-02-18 Eska B V A method for manufacturing colored cardboard, as well as colored cardboard manufactured by means of such a method, in a cardboard manufacturing device.

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2228465A (en) * 1938-11-29 1941-01-14 Du Pont Coloring of paper with sulphur colors
US5302441A (en) * 1991-11-15 1994-04-12 The Mead Corporation Postformable decorative laminating paper
DE4233040A1 (en) * 1992-10-01 1994-04-07 Basf Ag Process for dyeing paper
US6074527A (en) * 1994-06-29 2000-06-13 Kimberly-Clark Worldwide, Inc. Production of soft paper products from coarse cellulosic fibers
US6423183B1 (en) * 1997-12-24 2002-07-23 Kimberly-Clark Worldwide, Inc. Paper products and a method for applying a dye to cellulosic fibers
DE10219844C1 (en) * 2002-05-03 2003-09-18 Voith Paper Patent Gmbh Hot dispersion of a paper fiber suspension, from used recycled paper, has a press to give a high-consistency suspension for heating, with measurements of heating energy consumption to control the press action
US20050279472A1 (en) * 2004-06-18 2005-12-22 Sonoco Products Company Recycled white ticket stock and method of making same
US20070012412A1 (en) * 2005-07-15 2007-01-18 Schweitzer-Mauduit International, Inc. Laminate paper having increased pH stability and method of making same

Also Published As

Publication number Publication date
US20100126683A1 (en) 2010-05-27
AU2007247781B2 (en) 2011-03-10
WO2007128077A1 (en) 2007-11-15
NZ560597A (en) 2010-08-27

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MK14 Patent ceased section 143(a) (annual fees not paid) or expired