EP0662171B1 - Papierherstellung - Google Patents

Papierherstellung Download PDF

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Publication number
EP0662171B1
EP0662171B1 EP93920990A EP93920990A EP0662171B1 EP 0662171 B1 EP0662171 B1 EP 0662171B1 EP 93920990 A EP93920990 A EP 93920990A EP 93920990 A EP93920990 A EP 93920990A EP 0662171 B1 EP0662171 B1 EP 0662171B1
Authority
EP
European Patent Office
Prior art keywords
paper
nip
embossing
rollers
machine
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.)
Revoked
Application number
EP93920990A
Other languages
English (en)
French (fr)
Other versions
EP0662171A1 (de
Inventor
Allan Mcrae Milne
Barry Stephen Dodgson
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.)
Curtis Fine Paper Holdings Ltd
Original Assignee
Crown Vantage 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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=10722535&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0662171(B1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Crown Vantage Ltd filed Critical Crown Vantage Ltd
Publication of EP0662171A1 publication Critical patent/EP0662171A1/de
Application granted granted Critical
Publication of EP0662171B1 publication Critical patent/EP0662171B1/de
Anticipated expiration legal-status Critical
Revoked legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F11/00—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines
    • D21F11/006—Making patterned paper

Definitions

  • This invention relates to paper making and in particular to the making of paper which has its surface or structure modified, for example by embossing.
  • Embossed paper has been made in several ways. In one known way a dandy roll engaging the paper web during forming on the wire has been used to make an impression on one side of the web. After completion of the pressing and drying processes a paper is produced which has an embossed pattern on one side. The extent of such embossing is limited because of the effect of the subsequent pressing and drying on the pattern formed in the web. Further, if a paper is required which is embossed on both sides (which is most desirable) it is necessary to manufacture two half thickness paper webs and then laminate them together. Clearly this involves forming two webs in separate forming sections and bringing them together prior to pressing or double the amount of machine running time to produce two webs and then the cost of in house or contract lamination.
  • embossed paper Another previous known method of making embossed paper is to effect secondary treatment after the paper has been manufactured. Such secondary treatment involves passing it between embossing rollers. This process again, is expensive because it requires a secondary treatment machine. Further, after forming and drying the paper is relatively hard. For this reason, such embossing rollers have to be capable of dealing with paper in quite a hard condition and therefore need to be of metal or comparable material. To manufacture a pair of co-operating rollers to give double sided embossing requires heavy rollers with very close engagement. The cost of manufacturing such rollers and/or operating them with substantial nip pressures is undesirable and expensive.
  • DE-C-132665 and DE-C-71762 both disclose the use of resilient embossing nips in paper making machines in order to imprint watermarks as the paper is produced.
  • the present invention provides a method of making embossed paper including forming a web on a fourdrinier wire, and pressing and drying the web, and passing the web, before drying, through a nip between a pair of embossing rollers characterised in that at least one of those rollers has a resilient surface which has been patterned by laser engraving.
  • the nip is placed between the forming and drying stages and preferably during or after the pressing stage.
  • the process is carried out at a stage where the paper web contains from 50% to 65% water, preferably 54% to 58% moisture.
  • One component of the nip can have a textured (patterned) surface and can operate against a plain component.
  • both components of the nip can be textured. In the latter case the two members of the nip can be driven in close synchronism.
  • the resilient surface of the patterned roller, or of both nip components is preferably made of plastics or rubber material. Desirably natural rubber is used.
  • the laser engraving can be performed on the actual roller surface. However, as paper web widths approach three metres it may not be economic to manufacture a laser etching machine of such a size. In these circumstances it can be desirable to mount a sheet of surface material on a dummy roll and laser engrave the surface thereof. The sheet, after etching, is then removed from the dummy roll and mounted on the embossing roll. Several sheets can be mounted side by side in register and secured to the embossing roll. The embossing roll can itself have an outer layer of resilient material compatible with the surface sheet. As the laser engraving process treats a sheet sequentially, rather than treating the entire sheet at the same time, the size of sheet which can be treated is not significantly limited. This is in contra-distinction to moulding or pressing of a rubber or elastic sheet, wherein the size of sheet to be produced is limited by the size of mould or press required and the difficulty of producing fine detail with great regularity on a large mould or press.
  • the sheets can be applied by adhesive and/or vulcanisation.
  • the nip components are arranged and constructed so as to be capable of change between an operative nipping condition and an inoperative non-nipping condition so as to allow change from production of non-embossed paper to embossed paper and vice versa without interrupting paper production.
  • the nip can have a magazine arrangement so that different embossing patterns can be applied using different nip sets. Again it is desirable if this change can be effected whilst the paper web is running.
  • the nip When the nip is inoperative, for example when rollers are retracted, it can be arranged for the rollers to be detached and replaced so as to allow the embossing pattern to be changed.
  • the invention also provides a paper making machine including a resilient embossing nip and a press section and a dryer section, the resilient embossing nip being disposed before the dryer section and comprising a pair of rollers, at least one of which has a resilient surface which has been laser engraved.
  • the nip can have two resilient surfaces, and one or both of these can be a textured surface formed by laser engraving.
  • the invention also provides a paper making nip embossing roller having a resilient textured surface formed by laser engraving.
  • the method and machine of the invention can be used to provide non-laminated paper, especially of board weight, having embossed laid patterns on both sides.
  • laid pattern is meant a pattern of essentially parallel lines having for example a spacing of 0.5mm -2mm such as 1mm between them forming alternative small projections and dips in the surface of the paper.
  • non-laminated heavier-grade paper having a laid pattern on both sides. It also becomes possible to obtain non-laminated paper having different laid patterns on the two sides.
  • the lines of the laid pattern on the two sides of the heavier-grade paper run parallel to one another and are in register with one another so that dips on one side correspond to projections on the other, but this is not necessary.
  • the patterns are independent of one another they may vary from one to the other in spacing or direction of the lines or in displacement of the lines. This provides an additional possibility for non-laminated paper of lighter grades as well as board grades.
  • the two component rolls of the resilient embossing nip in the paper making machine are both formed with a corresponding pattern of essentially parallel lines of appropriate spacing and orientation, as by laser engraving or etching.
  • the paper web of appropriate weight is then passed through the resilient embossing nip in the manner described as part of the otherwise conventional manufacturing process.
  • Figure 1 shows part of a prior known paper making machine, a conventional breast box (11) a Fourdrinier wire (12), presses 13, 14 and a dryer section (15).
  • the dandy roll (16) which usually applies a water mark is constructed to be textured by having a cylindrical surface on which are mounted very fine projections, for example, in the form of copper wires so as to form a desired control pin which can be transferred to the paper and will manifest itself, after pressing and drying and subsequent treatment of the paper, as an embossed surface.
  • embossing is only on one side of a sheet.
  • Figure 2 shows the same paper making machine (10) but modified in accordance with the invention. After press (14) and before the dryer (15) the paper web (17) passes through a nip between a pair of embossing rollers (18) (19). Although figure 2 shows the machine being extended to accommodate the rollers (18) (19) in practice there is usually sufficient room to place the rollers without increasing the overall machine length. This is important in relation to existing machines wherein lengthening the machine is not practical.
  • the paper web has a water content of from 50 to 65%, preferably from 54 to 58%.
  • FIG 3 shows the incorporation of rollers (18) and (19) in a particular embodiment of paper making machine in rather more detail.
  • the paper web travels from right to left rather than from left to right as it is in figures 1 and 2.
  • Paper web (20) passes through press (13) and press (14) wherein it is preliminary dewatered by the absorbent felts (21). From the nip of press (14) the web (20) passes to the first dryer drum (22) and on its way passes the nip between rollers (18) and (19).
  • Roller (18) is fixed on a mounting (23) connected to the machine frame (24).
  • Roller (19) has a mounting (25) pivotable at (26) and influenced by a hydraulic or comparable ram arrangement (27).
  • Ram arrangement (27) can serve either to maintain steady nip pressure during use or it can be used to withdraw the roll (19) completely away from the web. With the roll (19) withdrawn paper passing over the roller (18) is not significantly influenced thereby and a plain unembossed paper is produced. This allows production to be switched between embossed and plain paper at will.
  • roll (18) can also be rendered retractable. Normally rollers (18) and (19) will have textured surfaces which are complimentary and which interengage. However, by having one of the rollers textured and the other a plain resilient cylindrical surface, perhaps of a slightly lower hardness than the other, a nip can be produced which will produce a web which is embossed on both sides. This reduces the amount of work necessary to produce the nip. In the case where one of the rollers is retractable away from the web this can conveniently be the textured roller. When removed from the web the textured roller can be replaced with a roll having a different pattern, thus changing the nature of the embossing during use.
  • both rollers are textured then both rollers can be rendered retractable and changeable in situ. If space permits the embossing rollers could be arranged in a magazine type arrangement to allow different nips of different embossing patterns to be introduced at will, even during running on the machine.
  • Figures 4 and 5 illustrate a method of making an embossing roller in accordance with the invention.
  • a roller (28) in accordance with the invention may be perhaps 3 metres long and about 500mm in diameter.
  • the roller (28) can have a cylindrical metallic core (not shown) surrounded by a base layer of natural rubber, also cylindrical and also not shown.
  • a plurality of sheets (29) engraved in accordance with the following method are adhered to the resilient rubber base layer on the roller and arranged to mate at their joins (30) with adjacent sheets and secured by adhesive and/or vulcanisation so as to produce an embossing roller having a resilient surface throughout its length.
  • a pattern is first produced.
  • the pattern can be in the form of a sheet of paper (31) upon which is marked the desired pattern.
  • the art work can be in the form of a black and white representation of the desired pattern of texture required on the surface.
  • the art work can be prepared on a single sheet and then enlarged photographically or electronically to form the sheet (31) which is of the same size as the final resilient sheet (29).
  • Sheet (31) is mounted on a drum (32) of the same diameter as the roller (28).
  • a plain sheet of resilient natural rubber (33) which will eventually form the sheet (29) is mounted on a comparable dummy roll or drum (34).
  • Drum (32) is indexed and rotated about its axis. At each index position a carriage (35) makes a traverse of the length of the drum (32).
  • a laser indicated at (36) directs its beam at the sheet (31) as the carriage traverses and the sheet (31) reflects back to the laser a signal which depends on the pattern at any particular point.
  • This information is stored on memory.
  • the information stored in the memory (which can be part of a computer controlling the whole process,) is then used to modify a laser indicated at (37) mounted on a carriage (38) which is traversable in a similar manner relative to drum (34).
  • Laser (37) differs from laser (36) in that it is a "write” laser rather than a "read” laser.
  • the drum (34) is indexed and as the carriage (38) traverses it the laser (37) evaporates portions of the sheet (33) to form a textured surface in accordance with the pattern formed on sheet (31).
  • the data can be modified before feeding to laser (37).
  • a sample pattern of a small size can be fed into the computer, the computer can generate the pattern for a full size sheet (33) by repeating the pattern. This can be useful when a new formed pattern is needed and the expense of creating the pattern as art work in full is not justified.
  • the use of a full size pattern and synchronised drum (32) and (34) operating simultaneously can have advantages in that data storage and later retrieval are unnecessary.
  • the invention is relevant to text covered paper, printing writing and paper of board weight.
  • the invention has particular applicability to papers of board weight, but is not necessarily so limited.
  • the laser engraving used can be "three dimensional". This means that the strength of the laser beam as it travels in lines across the surface has two values, namely high and a low value. When the beam is on its high value material is vaporised and removed. When the beam is on its low value little or no material is removed. This produces a surface which is composed entirely of lands and pits or channels. Desirably, however, the surface is laser engraved using a machine which can produce a "three dimensional" engraving pattern. This means that the laser beam has several, for example possibly five but desirably ten different levels giving not merely lands and pits, but also texture on the surfaces which can be graded from 0 to maximum depth as in the manner of a stepped pyramid or any stepped formation.

Landscapes

  • Machines For Manufacturing Corrugated Board In Mechanical Paper-Making Processes (AREA)
  • Paper (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)

Claims (11)

  1. Verfahren zur Herstellung von geprägtem Papier, das die Ausbildung einer Bahn (17, 20) auf einem Fourdrinier-Langsieb (12), Pressen und Trocknen der Bahn, sowie die Führung der Bahn vor dem Trocknen durch einen Walzenspalt zwischen zwei Prägewalzen (18, 19) umfaßt,
    dadurch gekennzeichnet, daß
    mindestens eine der Walzen eine elastische Oberfläche aufweist, auf der durch Lasergravur ein Muster erzeugt wurde.
  2. Verfahren nach Anspruch 1, bei dem beide Walzen (18, 19) des Präge-Walzenspalts ein Muster aufweisen und die zwei Walzen synchron angetrieben werden.
  3. Papiermaschine, die einen elastischen Präge-Walzenspalt (18, 19), eine Pressenpartie (13, 14) und eine Trockenpartie (15) umfaßt, wobei sich der elastische Präge-Walzenspalt vor der Trockenpartie befindet und zwei Walzen (18, 19) enthält, von denen mindestens eine Walze eine elastische, von einem Laser gravierte Oberfläche aufweist.
  4. Papiermaschine nach Anspruch 3, bei der die von einem Laser gravierte elastische Oberfläche mit einer Bahn oder mehreren Bahnen versehen ist, die auf einem Stützwalzenkern angeordnet sind.
  5. Papiermaschine nach Anspruch 3 oder 4, bei der die Walzen des Präge-Walzenspalts so angeordnet und konstruiert sind, daß sie zu einem Wechsel zwischen einer Betriebsart Quetschen und Nicht Quetschen befähigt sind.
  6. Papiermaschine nach einem der Ansprüche 3 bis 5, bei der der Präge-Walzenspalt in Magazin-Anordnung vorgesehen ist, so daß unterschiedliche Prägemuster unter Verwendung verschiedener Einstellungen des Walzenspaltes aufgebracht werden können.
  7. Papiermaschine nach einem der Ansprüche 3 bis 6, bei der der Walzenspalt zwei von einem Laser gravierte Walzen umfaßt, die verschiedene Muster aufweisen.
  8. Papiermaschine nach einem der Ansprüche 3 bis 7, bei der die oder jede von einem Laser gravierte Walze dreidimensional graviert wurde.
  9. Einen Walzenspalt bildende Papierprägewalze (18, 19), die eine elastische, durch Lasergravur erzeugte texturierte Oberfläche aufweist
  10. Unbeschichtetes Papier, das auf beiden Seiten liegende, geprägte Muster aufweist, die durch das Verfahren der Ansprüche 1 oder 2 oder durch die Papiermaschine eines der Ansprüche 3 bis 8 erzeugt wurden.
  11. Papier nach Anspruch 10, bei dem die Muster auf den jeweiligen Seiten voneinander unabhängig und nicht komplementär sind.
EP93920990A 1992-09-25 1993-09-21 Papierherstellung Revoked EP0662171B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
GB9220321 1992-09-25
GB9220321A GB2270931A (en) 1992-09-25 1992-09-25 Embossing means in a paper-making machine
PCT/GB1993/001993 WO1994008089A1 (en) 1992-09-25 1993-09-21 Paper making

Publications (2)

Publication Number Publication Date
EP0662171A1 EP0662171A1 (de) 1995-07-12
EP0662171B1 true EP0662171B1 (de) 1999-08-11

Family

ID=10722535

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93920990A Revoked EP0662171B1 (de) 1992-09-25 1993-09-21 Papierherstellung

Country Status (6)

Country Link
EP (1) EP0662171B1 (de)
AU (1) AU667626B2 (de)
DE (1) DE69326012T2 (de)
DK (1) DK0662171T3 (de)
GB (1) GB2270931A (de)
WO (1) WO1994008089A1 (de)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0662173A1 (de) * 1991-11-27 1995-07-12 The Procter & Gamble Company Aus Zellstoffasernhergestellte Strukturen mit durch Differenzdruck hergestellten Vorsprung und Verfahen zur Herstellung von solchen Strukturen
GB9411868D0 (en) * 1994-06-14 1994-08-03 Wiggins Teape Group The Limite Paper carrying a surface relief pattern
IT1287656B1 (it) * 1995-04-07 1998-08-06 Cartiere Cariolaro Spa Procedimento per la produzione di carta cedevole ed impianto per effettuare il procedimento
FR2759098B1 (fr) * 1997-02-04 2000-07-07 Aussedat Rey Procede de fabrication de papier marque et dispositif permettant la mise en oeuvre dudit procede
GB2380977B (en) * 2001-10-22 2003-09-03 Sca Hygiene Prod Gmbh Device for embossing tissue paper
GB2382325B8 (en) 2001-11-26 2008-06-05 Rue De Int Ltd Improvements in paper
EP2414131B1 (de) * 2009-03-30 2015-05-06 Boegli-Gravures S.A. Verfahren und vorrichtung zur strukturierung einer mit einer hartstoff-beschichtung versehenen festkörper-oberfläche mit einem laser unter verwendung von maske und blende
PT2414130E (pt) 2009-03-30 2015-06-08 Boegli Gravures Sa Método e dispositivo de estruturação de uma superfície de corpo sólido com um revestimento duro com um primeiro laser com pulsos no domínio dos nanossegundos e um segundo laser com pulsos no domínio dos pico ou fentossegundos; película de embalagem
DE102018120559A1 (de) * 2018-08-23 2019-07-04 Voith Patent Gmbh Verfahren zur Bearbeitung eines Walzenbezugs
DE102018120558A1 (de) * 2018-08-23 2019-08-14 Voith Patent Gmbh Verfahren zur Bearbeitung eines Pressmantels

Family Cites Families (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE71762C (de) * GEBR. SCHMITZ in Papierfabrik Merken b. Düren, Rheinland Einrichtung zum Einprägen von Zeichen in Papier während dessen Herstellung auf der Papiermaschine
DE132665C (de) *
GB413834A (en) * 1933-04-26 1934-07-26 Marie Jean Maurice Mougeot Improvements in and relating to a machine for the manufacture of paper, cardboard or similar products
DE685472C (de) * 1937-11-13 1939-12-18 Ludwig Ernst Walter Wasserzeichenvordruckwalze
GB836615A (en) * 1956-12-21 1960-06-09 Smith Paper Mills Ltd Howard Apparatus for marking paper during manufacture such marking including embossing
US2996425A (en) * 1959-06-29 1961-08-15 St Regis Paper Co Extensible paper product and process
US3130412A (en) * 1959-07-31 1964-04-21 Scott Paper Co Process of and apparatus for treating sheet materials and product
GB1192398A (en) * 1967-08-07 1970-05-20 Karl Hanke Relief Moulding of Fibrous Pulp Webs
US4424519A (en) * 1979-05-24 1984-01-03 American Hoechst Corporation System and method for producing artwork for printed circuit boards
US4507173A (en) * 1980-08-29 1985-03-26 James River-Norwalk, Inc. Pattern bonding and creping of fibrous products
US4629858A (en) * 1983-12-12 1986-12-16 Interface Flooring Systems, Inc. Method for engraving carpet and carpet so engraved
US4918611A (en) * 1988-07-21 1990-04-17 Industrial Technology Research Institute Method and apparatus for controlling laser cutting by image processing
US4970600A (en) * 1989-04-04 1990-11-13 Melco Industries, Inc. Laser engraver with X-Y assembly and cut control
DE4033230A1 (de) * 1990-10-19 1992-04-23 Hueck Fa E Oberflaechenstrukturierte, grossformatige metallene pressplatten und/oder endlosbaender und verfahren zu deren herstellung

Also Published As

Publication number Publication date
GB2270931A (en) 1994-03-30
WO1994008089A1 (en) 1994-04-14
DK0662171T3 (da) 2000-03-20
AU6136294A (en) 1994-04-26
DE69326012T2 (de) 1999-11-25
GB9220321D0 (en) 1992-11-11
EP0662171A1 (de) 1995-07-12
DE69326012D1 (de) 1999-09-16
AU667626B2 (en) 1996-03-28

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