EP0898513B1 - Paper treatment - Google Patents
Paper treatment Download PDFInfo
- Publication number
- EP0898513B1 EP0898513B1 EP97923210A EP97923210A EP0898513B1 EP 0898513 B1 EP0898513 B1 EP 0898513B1 EP 97923210 A EP97923210 A EP 97923210A EP 97923210 A EP97923210 A EP 97923210A EP 0898513 B1 EP0898513 B1 EP 0898513B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- ink
- paper product
- paper
- product
- ply
- 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.)
- Expired - Lifetime
Links
Images
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M1/00—Inking and printing with a printer's forme
- B41M1/12—Stencil printing; Silk-screen printing
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M1/00—Inking and printing with a printer's forme
- B41M1/10—Intaglio printing ; Gravure printing
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M3/00—Printing processes to produce particular kinds of printed work, e.g. patterns
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M7/00—After-treatment of prints, e.g. heating, irradiating, setting of the ink, protection of the printed stock
- B41M7/0027—After-treatment of prints, e.g. heating, irradiating, setting of the ink, protection of the printed stock using protective coatings or layers by lamination or by fusion of the coatings or layers
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- 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
- D21H21/28—Colorants ; Pigments or opacifying agents
Definitions
- This invention relates to colouring papers and cards particularly, but not exclusively, for use in book binding and the manufacture of games boards, presentation boxes and stationery.
- the cost of coloured dyes accounts for a significant proportion of the cost of producing coloured paper. This is particularly so for deep coloured papers which require high dye concentration.
- EP 0,414,015 discloses a method of colouring paper in which the upper surface of a tissue web is impregnated with a colouring ink in a single application.
- the degree of penetration of the ink is limited as much as possible, and there is no teaching concerning the rate of decrease in concentration of the ink through the depth of the tissue web.
- An object of the present invention is to provide a deeply coloured paper that is durable, while still being cost effective to produce. This is achieved by impregnating the paper with ink or dye below the upper or outer surface of the paper, and using a technique to do this which optimises the concentration of the impregnated ink relative to the depth of penetration below the upper layer of the paper.
- the present invention provides a paper product comprising a ply of lightly coloured base paper having an upper surface in which a portion of the ply below the upper surface is impregnated with a colouring ink, wherein the colouring ink decreases in concentration in a direction through the ply moving away from the upper surface, characterised in that the rate of the decrease in concentration of the ink is greater in a first portion of the paper product closest to the upper surface than in a second portion of the paper product further away from the upper surface.
- the concentration of impregnated ink decreases at a first substantially linear rate through the first portion of the paper produce closest to the upper surface of the product, and at a second and lower substantially linear rate through the second portion of the paper product further away from the upper surface.
- the paper product may be a cellulosic fibre paper, a paper made of a synthetic fibre material or a paper made of mixed fibres.
- the colouring ink may extend substantially across the entire surface area of the paper product.
- the product may be capable or adapted to be folded so as to form a crease in the product such that the resulting damage to the outermost fibres towards the upper surface does not allow uncoloured fibres to show through.
- the lightly coloured paper base may be white or tinted.
- the paper product may have more than one ply of paper.
- the colouring ink may be present only in the top ply; it may extend substantially or wholly through the top ply.
- the presence of the colouring ink below the surface of the ply may allow the product to be folded without the base colour of the product showing through the surface of the top ply.
- the type of coloured ink is preferably chosen so as to have a good scuff resistance.
- the ink is preferably selected to have one or more of the following characteristics:
- the ink may be solvent based but is preferably water based.
- the ink may penetrate to a depth of at least 30 or 35 microns below the upper surface of the paper product. It may penetrate to a greater depth.
- the ink may penetrate to a depth of substantially 30% of the depth of the ply below the upper surface of the paper product. It may have a penetration of at least 30% and may have a greater penetration. If the ink is solvent based then the penetration may be greater.
- the concentration of ink may decrease with depth of penetration.
- printers generally seek to minimise the quantity of ink that is used. This is done by formulating the ink to minimise ink penetration into the paper and/or by coating, treating or selecting the paper so as to minimise ink penetration.
- a paper product in accordance with the present invention preferably has a greater ink penetration; in one of its aspects, the invention seeks to achieve a certain or minimum ink penetration to obtain the advantages discussed.
- the present invention provides a method of producing a paper product including the steps of:
- the method may also include one or more of the following steps:
- the method may be performed on a paper making machine, for example, immediately after the drum reel operation. Alternatively, the method may be performed on a paper product removed from a paper making machine.
- the two ply paper product 10 of Fig 1 has been overprinted over its entire upper surface 20 with an ink 21.
- the ink penetrates from the top surface 20 substantially through the upper ply 11 but not into the lower ply 12.
- a thin layer of ink 21 is present at the top surface 20 and, as shown in Fig 2, the concentration of ink x decreases in a direction y moving away from the top surface.
- the plies 11,12 may be of a light colour having been dyed during manufacture or may be white; they may be of different colours.
- the plies 11,12 may be of a corresponding lighter colour to the ink; for example, the plies may be light blue when the ink is a deep or dark blue.
- the paper product 10 is sufficiently strong that it can be used as a binding paper for example for booking binding, games boards, box and stationery manufacturing. Its presentation surface has adequate scuff and water resistance so that it does not readily lose colour or deposit fibres when a contacting surface is rubbed against it.
- the paper accepts adhesives (for binding purposes) whilst not permitting the adhesive to saturate the sheet.
- the scuff resistance is such that face to face abrasion resistance carried out on Martindale testing equipment is in excess of 1000 cycles.
- the ink is adequately absorbed into the paper such that when the paper is folded over an edge or corner, the resulting damage to the outermost layer of fibres does not allow uncoloured fibres to show through.
- the ink may be an aqueous based ink.
- the apparatus 30 of Fig 3 is arranged to treat a roll of paper 31 which has been manufactured in a separate process.
- the apparatus 30 comprises:
- the paper product passes through a dwell portion 39,40 to allow the sheet adequate dwell time such that it re-stabilises before being rewound.
- the re-moisturising station 39 which may comprise a re-moisturising unit and a conditioning unit is stationed prior to rewinding.
- the re-moisturising unit applies water to the uncoated paper surface thereby counteracting the influence of the water-based overprint ink.
- the conditioning unit allows the paper sufficient dwell time in the process to accept the moisture and re-stabilise.
- the ink may be applied to the paper product in a single printing operation it has been found advantageous to apply the ink in two separate passes with an intervening drying operation.
- the drying operation may be encouraged by use of an infra-red or microwave dryer (as illustrated) but such a dryer is not always necessary.
- 3 grams per m 2 dry ink may be applied to the paper product. In the embodiment of Fig 3 this may be achieved by applying 1.5 grams per m 2 at each of the two print heads.
- Figure 4 graphs the concentration from a two print process.
- the line AB represents the concentration of the ink relative to the depth of the paper below the upper sheet surface after the first print run.
- line CD the rate of impregnation of the ink from the second print run.
- the resultant aggregate concentration from the two print runs is therefore graphed by the line AD.
- This concentration is advantageous as the ink concentration is greatest, exponentially, where it is most wanted. It reduces the amount of ink needed to achieve a paper of suitable durability and this is beneficial in light of the aforementioned high cost of the ink itself.
Landscapes
- Paper (AREA)
- Printing Methods (AREA)
- Color Printing (AREA)
Description
Claims (12)
- A paper product comprising a ply of lightly coloured base paper having an upper surface in which a portion of the ply below the upper surface is impregnated with a colouring ink, wherein the colouring ink decreases in concentration in a direction through the ply moving away from the upper surface, characterised in that the rate of the decrease in concentration of the ink is greater in a first portion of the paper product closest to the upper surface than in a second portion of the paper product further away from the upper surface.
- A paper product as claimed in Claim 1 wherein the concentration of impregnated ink decreases at a first substantially linear rate through said first portion of the paper product closest to the upper surface of the product, and at a second and lower substantially linear rate through said second portion of the paper product further away from the upper surface.
- A paper product as claimed in Claim 1 or Claim 2 made from cellulosic, synthetic or mixed fibres.
- A paper product as claimed in any one of the preceding Claims wherein the colouring ink extends substantially across the entire surface area of the paper product.
- A paper product as claimed in any one of the preceding claims capable or adapted to be folded so as to form a crease in the product such that the resulting damage to the outermost fibres towards the upper surface does not allow uncoloured fibres to show through.
- A paper product as claimed in any one of the preceding Claims wherein the lightly coloured paper base is tinted.
- A paper product as claimed in any one of the preceding Claims having more than one ply of paper and wherein the colouring ink is present only in the top ply.
- A paper product as claimed in any one of the preceding Claims wherein the colouring ink is selected to have one or more of the following characteristics:a. high resistance to dry and moist rub;b. high resistance to colour change under pressure and temperature;c. flexibility of ink film for embossing and casing-in so as to prevent cracking of the ink layer;d. good foil stamping, blind blocking and screen printing properties;e. good lightfastness (ie resistance to fading, for example 3 min on the Blue Wool Scale);f. no set-off onto underside;g. no set-off onto design rolls or matrix bowls;h. good paper penetration characteristics.
- A paper product as claimed in any one of the preceding Claims wherein the colouring ink penetrates to a depth of at least 30 microns below the upper surface of the paper product.
- A method of producing a paper product including the steps of:a) printing with ink a sheet surface of the paper product;b) allowing the ink to permeate into a portion of the paper product below the sheet surface; andc) reprinting the sheet with ink, so that the rate of the decrease in concentration of the ink is greater in a first portion of the paper product closest to the upper surface than in a second portion of the paper product further away from the upper surface.
- A method as claimed in Claim 10 also including one or more of the following steps:a. unwinding the paper product;b. drying the ink between the two printing applications;c. applying a lacquer over the sheet surface;d. embossing the product;e. re-moisturising the underside of the product;f. rewinding the product;g. allowing a dwell time to re-stabilise the product.
- A method as claimed in Claim 10 or Claim 11 performed on a paper making machine immediately after the drum reel operation.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB9610456 | 1996-05-18 | ||
GB9610456A GB9610456D0 (en) | 1996-05-18 | 1996-05-18 | Paper treatment |
PCT/GB1997/001378 WO1997044195A1 (en) | 1996-05-18 | 1997-05-19 | Paper treatment |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0898513A1 EP0898513A1 (en) | 1999-03-03 |
EP0898513B1 true EP0898513B1 (en) | 2000-08-16 |
Family
ID=10793954
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP97923210A Expired - Lifetime EP0898513B1 (en) | 1996-05-18 | 1997-05-19 | Paper treatment |
Country Status (6)
Country | Link |
---|---|
EP (1) | EP0898513B1 (en) |
AU (1) | AU2907597A (en) |
DE (1) | DE69702843T2 (en) |
ES (1) | ES2151730T3 (en) |
GB (1) | GB9610456D0 (en) |
WO (1) | WO1997044195A1 (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
IL120926A0 (en) * | 1997-05-27 | 1997-09-30 | Nur Advanced Tehnologies Ltd | Method and apparatus for printing signs and signs constructed in accordance with said method and/or by said apparatus |
US6096412A (en) * | 1998-08-07 | 2000-08-01 | The Procter & Gamble Company | High color density printing on sanitary disposable paper products exhibiting resistance to ink rub-off |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE67632C (en) * | R. HÖESCH in Düren, Rheinland | Process for one-sided dyeing of paper in paper machines | ||
FR537357A (en) * | 1921-06-24 | 1922-05-22 | Improvements in the manufacture of cardboard and colored papers | |
US2089949A (en) * | 1935-05-06 | 1937-08-17 | Hinde & Dauch Paper Co | Process of coloring paper |
JPH03193999A (en) * | 1989-08-03 | 1991-08-23 | Kimberly Clark Corp | Colored tissue web and its manufacture |
US5520989A (en) * | 1992-12-07 | 1996-05-28 | Avery Dennison Corporation | Recyclable print-tinted paper |
DE4307873A1 (en) * | 1993-03-12 | 1994-09-15 | Ap Werkstatt | Paper and method for its production |
-
1996
- 1996-05-18 GB GB9610456A patent/GB9610456D0/en active Pending
-
1997
- 1997-05-19 EP EP97923210A patent/EP0898513B1/en not_active Expired - Lifetime
- 1997-05-19 WO PCT/GB1997/001378 patent/WO1997044195A1/en active IP Right Grant
- 1997-05-19 DE DE69702843T patent/DE69702843T2/en not_active Expired - Fee Related
- 1997-05-19 AU AU29075/97A patent/AU2907597A/en not_active Abandoned
- 1997-05-19 ES ES97923210T patent/ES2151730T3/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
DE69702843T2 (en) | 2001-03-29 |
DE69702843D1 (en) | 2000-09-21 |
EP0898513A1 (en) | 1999-03-03 |
WO1997044195A1 (en) | 1997-11-27 |
AU2907597A (en) | 1997-12-09 |
ES2151730T3 (en) | 2001-01-01 |
GB9610456D0 (en) | 1996-07-24 |
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