EP0898513A1 - Traitement du papier - Google Patents

Traitement du papier

Info

Publication number
EP0898513A1
EP0898513A1 EP97923210A EP97923210A EP0898513A1 EP 0898513 A1 EP0898513 A1 EP 0898513A1 EP 97923210 A EP97923210 A EP 97923210A EP 97923210 A EP97923210 A EP 97923210A EP 0898513 A1 EP0898513 A1 EP 0898513A1
Authority
EP
European Patent Office
Prior art keywords
ink
paper
paper product
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.)
Granted
Application number
EP97923210A
Other languages
German (de)
English (en)
Other versions
EP0898513B1 (fr
Inventor
Stephen Forbes
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.)
Watson Grange Ltd
Original Assignee
Watson Grange 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
Application filed by Watson Grange Ltd filed Critical Watson Grange Ltd
Publication of EP0898513A1 publication Critical patent/EP0898513A1/fr
Application granted granted Critical
Publication of EP0898513B1 publication Critical patent/EP0898513B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • 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
    • 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
    • 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
    • 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
    • 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.
  • 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 highest just beneath the upper surface.
  • the concentration of impregnated ink may decrease at a first substantially linear rate through a first portion of the paper product closest to the upper surface of the product, and at a second and lower substantially linear rate through a 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: 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.
  • 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.
  • Fig 1 is a cross section through a paper product
  • Fig 2 is a graph of ink concentration through the paper product
  • Fig 3 is a schematic cross section of an apparatus for producing the product
  • Fig 4 is a graph of ink concentration through a paper product produced by the apparatus of Figure 3.
  • 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: a. an unwinding station 32; b. a first printing station 33 having a printing head for applying ink across the entire surface of the paper product; c. an infra-red or microwave drying station 34; d. a second printing station 35 having a printing head for applying ink across the entire surface of the paper product; e. a second infra-red or microwave drying station 36; f. an embossing nip 37; g. a station 38 for applying a layer of lacquer across the paper product; h. a backwet unit or re-moisturising station 39; i. an accumulator 40; and j. a rewind station 41.
  • 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 contracting 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)

Abstract

L'invention porte sur un appareil et un procédé de fabrication d'un produit papier à forte coloration, ledit procédé consistant à imprégner un côté du papier d'une encre de coloration, à laisser l'encre s'imprégner dans le produit papier et, de préférence, à appliquer ensuite sur le produit papier une deuxième impression d'encre.
EP97923210A 1996-05-18 1997-05-19 Traitement du papier Expired - Lifetime EP0898513B1 (fr)

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 (fr) 1996-05-18 1997-05-19 Traitement du papier

Publications (2)

Publication Number Publication Date
EP0898513A1 true EP0898513A1 (fr) 1999-03-03
EP0898513B1 EP0898513B1 (fr) 2000-08-16

Family

ID=10793954

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97923210A Expired - Lifetime EP0898513B1 (fr) 1996-05-18 1997-05-19 Traitement du papier

Country Status (6)

Country Link
EP (1) EP0898513B1 (fr)
AU (1) AU2907597A (fr)
DE (1) DE69702843T2 (fr)
ES (1) ES2151730T3 (fr)
GB (1) GB9610456D0 (fr)
WO (1) WO1997044195A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
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)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE67632C (de) * R. HÖESCH in Düren, Rheinland Verfahren zum Einseitigfärben von Papier bei Papiermaschinen
FR537357A (fr) * 1921-06-24 1922-05-22 Perfectionnements à la fabrication des cartons et papiers coloriés
US2089949A (en) * 1935-05-06 1937-08-17 Hinde & Dauch Paper Co Process of coloring paper
JPH03193999A (ja) * 1989-08-03 1991-08-23 Kimberly Clark Corp 色付きティシュウエブおよびその製造方法
US5520989A (en) * 1992-12-07 1996-05-28 Avery Dennison Corporation Recyclable print-tinted paper
DE4307873A1 (de) * 1993-03-12 1994-09-15 Ap Werkstatt Papier und Verfahren zum Herstellen desselben

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9744195A1 *

Also Published As

Publication number Publication date
DE69702843T2 (de) 2001-03-29
WO1997044195A1 (fr) 1997-11-27
DE69702843D1 (de) 2000-09-21
GB9610456D0 (en) 1996-07-24
EP0898513B1 (fr) 2000-08-16
ES2151730T3 (es) 2001-01-01
AU2907597A (en) 1997-12-09

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