WO2007122284A1 - PROCÉDÉ de marquage de papier ou de carton et MATÉRIAU MARQUÉ par le PROCÉDÉ - Google Patents

PROCÉDÉ de marquage de papier ou de carton et MATÉRIAU MARQUÉ par le PROCÉDÉ Download PDF

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Publication number
WO2007122284A1
WO2007122284A1 PCT/FI2007/000103 FI2007000103W WO2007122284A1 WO 2007122284 A1 WO2007122284 A1 WO 2007122284A1 FI 2007000103 W FI2007000103 W FI 2007000103W WO 2007122284 A1 WO2007122284 A1 WO 2007122284A1
Authority
WO
WIPO (PCT)
Prior art keywords
marking
paper
web
laser
board
Prior art date
Application number
PCT/FI2007/000103
Other languages
English (en)
Inventor
Nina Miikki
Minna Kurittu
Risto Vesanto
Original Assignee
Stora Enso Oyj
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 Stora Enso Oyj filed Critical Stora Enso Oyj
Publication of WO2007122284A1 publication Critical patent/WO2007122284A1/fr

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Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F1/00—Wet end of machines for making continuous webs of paper
    • D21F1/44—Watermarking devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
    • B41M5/24—Ablative recording, e.g. by burning marks; Spark recording
    • 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
    • D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
    • D21H27/02—Patterned paper

Definitions

  • the invention relates to a method of producing markings, which are difficult to forge, on a paper or board that is manufactured as a continuous web.
  • the inven- tion also relates to a paper or board product that contains markings provided by the method.
  • the dynamic laser technology offers new methods of making extremely accurate markings without physically touching the surface that is to be marked or bringing more material on it, for example, printing ink.
  • laser markings can be made by directing energy on the surface of a fibre layer by using a CO 2 laser beam of a lower power density.
  • a CO 2 laser beam of a higher power density and an inert protective gas that prevents oxidation cavities can be engraved into the fibre layer by evaporating the material, the cavities working as identification marks that can be detected by a detector in irradiation.
  • the markings are made by the laser beam between the layers of a sandwich-type packaging material before the layers are brought together, so that the markings remain covered within the sandwich structure of the material.
  • the layers can contain similar or different fibre layers, and also polymer films or coating layers that are typically used in the field.
  • US Patent No. 4824691 describes that, when making markings by a paper machine at moisture contents of 6 to 8% by weight, the energy brought by a low- energy laser (1.7-1.8 J cm '2 ) causes a local disturbance in the arrangement of fibres, which can be observed as a visible mark in the finished product. It was reported that higher energies (1.9-5.0 J cm '2 for a pulsed laser and 2.2-4.8 J cm "2 for a continuous-wave laser) resulted in a disturbing scorching and darkening of the surface, which in the application of the publication, when making high-quality copying paper, is not acceptable from the point of quality.
  • Patent publication US 4824691 describes the marking of pressure-sensitive copying paper by the logo of the manufacturer or another identification mark. The accuracy and the clarity of the marks that were made on high-quality coated copying paper were examined as a function of several factors. The power of the laser beam and the moisture of the paper were observed to have an effect on the quality of the markings that were made in the dry end of the paper machine, so that the best results were obtained within a moisture range of 6 to 8% (the portion of water from the total mass).
  • the marking should be located under a coating or a surface layer so that the intactness of the surface material would be an indication of authenticity.
  • the inventors of the present invention have surprisingly discovered that even single-layer paper or board can be marked so that the marking becomes suffi- ciently visible and durable without a separate coating or protective layer, but that it is not possible to forge it on the completed paper, however.
  • such paper or board can be coated later on or used as part of a sandwich structure, whereby its visible, marked surface functions as an identification. In that case, the other layers can be freely selected to serve other purposes and characteristics.
  • the object of the present invention is to provide a solution that enables the marking of paper or board, which is used as packaging material, in particular, by using laser energy to form an identification that is essentially more difficult to forge than before.
  • the basis of the invention is that, at the packaging stage, instead of markings that are made on the complete package or a package that is being com- pleted, the marking is incorporated into the actual packaging material, paper or board at such a stage that it cannot be repeated on the finished product.
  • the method according to the invention is essentially characterized in that the markings are made by the laser beam on a moving, wet fibre layer that is in the form of a web so that the markings remain visible after the paper has dried.
  • the identification marks are made on the moving web in a paper or board machine at a typical manufacturing speed of the product (200 to 2000m/min). In other words, to make the marking, the speed does not need to be lowered, but when so desired, this can also be done.
  • the mark can be made at the web former, between the former and the dry- ing section, and in the drying section, between the drying units.
  • the solids content of the paper or board that is completed in the paper machine is preferably about 9 to 93% by weight. After the moisture has escaped from the paper, the identifier remains in sight, but it can no longer be altered or repeated too easily by a forger.
  • the laser heads that are used in marking can be located, for example, in a sta- tionary installed beam that is transverse to the web, producing onto the moving web a regular continuous or discontinuous pattern that suitably covers the web.
  • the laser beams can also be focused on the web by means of the lens or mirror arrangements typical of the laser technology.
  • the pattern that is used as the identifier can be any pictorial, literal or other trademark of the paper or board manufac- turer, packager, or the manufacturer of the packaged product, for example, and it is most preferably specific to the product that is to be packaged.
  • the selection of the stencils, frames or other means that are needed to define the pattern is evident to those skilled in the art.
  • the additives used are mixed with the pulp as early as in the head box and, typically, no other coating is applied.
  • Such a marked and dried fibrous web can be combined with another layer already before winding onto a roll, or unwound on another line for lamination.
  • the layer is preferably used as the surface layer, e.g., the inner or outer surface of packaging blanks which are to be formed into boxes or the like.
  • one application of the invention is a board comprising two or more superimposed fibre layers, the markings being made, before combining the layers, on either surface of the web-like fibrous layer that remains outwardly visible.
  • the fibrous webs can still be moist, whereby the markings that remain on the surface exist already before the final drying of the combined web at the board machine, and they will be inextricably integrated into the thus obtained, completed board.
  • a layer of coating paste or adhesive can also be added onto the marked and dried paper or board that is manufactured according to the invention, or a polymer coat- ing that is combined by extrusion, for example, can be added to the fibre layer, both of which can optionally either be processed in the manufacturing process at the paper or board machine or in a separate coating unit subsequent to the same.
  • the transparent polymer coating By using the transparent polymer coating, the identification marks provided by removing fibres or discolouration can be left in sight, even if the marked layer was not the surface layer of the structure. According to the invention, making the identification marks and the subsequent coatings are implemented as a continuous process without discontinuing the movement of the web, at the conventional speeds in the field.
  • the products obtained according to the invention comprise paper or board in web form, containing the identification marks and being provided with markings made by the laser beam, the markings being made on the wet web before the final drying of the product.
  • a marked product can be manufactured on a large scale at the paper or board mill, from where it is supplied to a client company to be further processed.
  • the paper or board obtained as the product can be further proc- essed by the methods typical of the field, and products similar to the known ones are obtained, containing the marking according to the invention.
  • the material can be a single-layer or multi-layer board, coated paper or board or polymer-coated paper or board, and the markings can be visible on the surface layer or under the transparent polymer coating, or the markings can be under the coating or the fibre layer, whereby they can be observed by transillumination or by a detector.
  • Fig. 1 shows the marking of a web transverse to the travelling direction of the web former, by means of laser heads 3, which are attached to a supporting beam 2 and from which laser beams 4 are focused on the moving web.
  • Fig. 2 shows possible spots for laser-marking the fibrous material web, which is formed from the pulp coming from the head box, at a web former 5, between the web former 5 and a press section 6, in the press section 6 between press units 6A, 6B and 6C, or between the press section 6 and a drying section 7, or in the drying section 7.
  • the thickened arrows show the locations in the process, in which the laser marking can optionally be made and in which the laser-marking equipment in the process should be located.
  • Fig. 3 shows an electron microscope image including some of the laser-marked and unmarked fibre surface.
  • Fig. 3A part of the marked text, the letter O, is shown as a 3Ox enlargement in the chemical pulp fibre described in Example 1.
  • Fig. 3B shows a 50Ox enlargement, which allows a more accurate view of the changes caused by the effect of the laser energy on single fibres in the marking area. In the marked area, a considerable escape of material from the fibre struc- ture is visible, caused by the effect of the laser energy.
  • Fig. 1 shows a fibre material web 1 , the supporting beam 2 transverse to the web being placed in its way, and the identification marks that identify the web being produced onto the web by the laser beams 4 that are focused on the surface of the web from the laser heads 3 adjacent to the supporting beam.
  • the marking can consist of a freely selected pattern, such as the name, identification image or trademark of the company or the product, and they form regular groups of patterns on the web at equal intervals. There should be enough markings on the web to cover each sheet or packaging blank that is later on selectively separated from the web.
  • the laser heads 3 in Fig. 1 can be CO 2 laser emitters, which have a low power density and which lightly bum the surface of the web 1 so that the identification marks comprise the darkening that is a result of the fibres evaporating, becoming plasmatic, burning and/or the fibre material oxidizing. Furthermore, it is possible that the laser beams 4 are used for reacting or evaporating the material selectively from a certain depth of the web, alternatively, or throughout the thickness of the web so that the density and/or the composition of the web changes at the marking spot with respect to the unmarked web.
  • Fig. 2 shows an extremely simplified flow chart, wherein the fibre material web is formed from pulp, which is fed from the head box, by means of the web former 5.
  • the fibre material web can be marked by means of laser energy at the web former 5, whereby the fibre content of the pulp is very low, even below 10%.
  • An alternative spot for making the marking lies between the web former 5 and the press section 6 before the liquid is removed from the web by pressing.
  • the marking can be made in the press section 6 between the press units.
  • the units are shown by naming them as press units 6A, 6B and 6C, whereby the naming of the units is suggestive.
  • press units 6A, 6B and 6C whereby the naming of the units is suggestive.
  • One embodiment according to the invention is to make the marking after the press section 6 before the drying section 7 with re- spect to the travelling direction of the web, i.e., between the units.
  • the marking can also be located in
  • the product that is obtained as a continuous web may possibly further go through optional surface treatment 8 or further processing stages 9, 10, after which it is wound on a roll and the product 11 is supplied in the form of a roll, sheets, or blanks to be used as individual product packages that contain the identification marks.
  • the other material layer that is brought onto the marked fibre material web 1 can also consist of a polymer film that is laminated therewith, for example, or a single or multi-layer extruded polymeric coating. It is also possible to laser-mark the fibre material web 1 at the paper or board machine, whereby, at the next stage, the coating paste is brought onto the marked and dried web, covering the identification marks.
  • a test was conducted in laboratory conditions, wherein a text marking was made on wet fibre material, chemical pulp fibre, by means of a 16W laser.
  • the solids contents and the powers of the laser beam that were used in the test series are shown in Table 1.
  • the same table also shows the results obtained by the said test arrangements.
  • the travelling speed of the laser beam was 500mm/s and the diameter of the focused beam was 290 ⁇ m.
  • the chemical pulp fibre refers to chemically defibrated softwood fibre without additives.
  • the board herein comprises a 175g/m 2 sheet made of dried chemical pulp fibre (from bleached chemical pulp, and not from brown or chemi-mechanical pulp).
  • the copying paper used in the test was a 80g/m 2 sheet made of chemical pulp, containing CaCO 3 as an inorganic additive.
  • the laser marking appeared slightly darker than its surroundings.
  • the marking was also visible against light, because the effective laser beam removes fibres, and a spot of the marking that is thinner than its surroundings permeates light easier.
  • a less oxidized or lighter marking was obtained on the board, which had a solids content of 44% at the time of marking, by using the same power than for the more viscous chemical pulp fibre.
  • the marking that is visible against light indicates an escape of the material.

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  • Paper (AREA)

Abstract

L'invention concerne un procédé permettant de doter du papier ou du carton d'un marquage qui ne peut pas être répété après que le papier ait été détaché de la machine à papier et séché. Le marquage est effectué par focalisation d'énergie laser sur les fibres du matériau de la surface d'un objet en forme de nappe ou à travers son épaisseur. L'invention concerne également le papier ou le carton marqué, qui peuvent être fabriqués par le procédé ou un produit obtenu à partir de celui-ci par un nouveau traitement.
PCT/FI2007/000103 2006-04-21 2007-04-20 PROCÉDÉ de marquage de papier ou de carton et MATÉRIAU MARQUÉ par le PROCÉDÉ WO2007122284A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI20060382 2006-04-21
FI20060382A FI20060382A0 (fi) 2006-04-21 2006-04-21 Menetelmä paperin tai kartongin merkitsemiseksi ja menetelmällä merkitty materiaali

Publications (1)

Publication Number Publication Date
WO2007122284A1 true WO2007122284A1 (fr) 2007-11-01

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PCT/FI2007/000103 WO2007122284A1 (fr) 2006-04-21 2007-04-20 PROCÉDÉ de marquage de papier ou de carton et MATÉRIAU MARQUÉ par le PROCÉDÉ

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FI (1) FI20060382A0 (fr)
WO (1) WO2007122284A1 (fr)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010094838A1 (fr) * 2009-02-20 2010-08-26 Laminating Papers Oy Procédé pour la production d'une toile fibreuse imprégnée comportant des marques, plaque revêtue de la toile fibreuse imprégnée et utilisation de la toile fibreuse imprégnée dans un moule de coulée de béton
DE102009029081A1 (de) 2009-09-02 2011-03-03 Voith Patent Gmbh Lasermarkierung
CN108350663A (zh) * 2015-09-23 2018-07-31 斯道拉恩索公司 无油墨印刷纸
DE102017119819A1 (de) 2017-08-29 2019-02-28 Delfortgroup Ag Verfahren zum Aufbringen von Registermarken auf Umhüllungspapier für Rauchartikel
US10390998B2 (en) 2014-11-07 2019-08-27 The Procter & Gamble Company Process and apparatus for manufacturing an absorbent article using a laser source
US10806635B2 (en) 2016-03-15 2020-10-20 The Procter & Gamble Company Methods and apparatuses for separating and positioning discrete articles
WO2023118615A1 (fr) 2021-12-21 2023-06-29 Lortek S.Coop. Dispositif de traçabilité automatique et dynamique de bobines de papier tissue

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3431577A1 (de) * 1984-08-28 1986-03-13 Heinr. Aug. Schoeller Söhne GmbH & Co KG, 5160 Düren Verfahren zur herstellung echter wasserzeichen in papier
US4740269A (en) * 1985-10-11 1988-04-26 Oesterreichische Nationalbank Process and apparatus for applying authenticating coding to value-carrying paper
US4824691A (en) * 1986-03-27 1989-04-25 The Wiggins Teape Group Limited Imaged microcapsule-coated paper
SE503890C2 (sv) * 1994-12-01 1996-09-23 Jan Erik P Nordstroem Metod att förbättra framställningen av och kvaliteten hos papper, kartong och fiberskivor samt användning av metoden
US5871615A (en) * 1994-06-14 1999-02-16 The Wiggins Teape Group Limited Method for the manufacture of security paper
WO1999060208A2 (fr) * 1998-05-20 1999-11-25 Zanders Feinpapiere Ag Procede pour marquer des papiers et des cartons
WO2005065956A1 (fr) * 2004-01-05 2005-07-21 Stora Enso Oyj Procede de fourniture de papier ou de carton avec marques d'identification et materiau marque produit par ce procede

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3431577A1 (de) * 1984-08-28 1986-03-13 Heinr. Aug. Schoeller Söhne GmbH & Co KG, 5160 Düren Verfahren zur herstellung echter wasserzeichen in papier
US4740269A (en) * 1985-10-11 1988-04-26 Oesterreichische Nationalbank Process and apparatus for applying authenticating coding to value-carrying paper
US4824691A (en) * 1986-03-27 1989-04-25 The Wiggins Teape Group Limited Imaged microcapsule-coated paper
US5871615A (en) * 1994-06-14 1999-02-16 The Wiggins Teape Group Limited Method for the manufacture of security paper
SE503890C2 (sv) * 1994-12-01 1996-09-23 Jan Erik P Nordstroem Metod att förbättra framställningen av och kvaliteten hos papper, kartong och fiberskivor samt användning av metoden
WO1999060208A2 (fr) * 1998-05-20 1999-11-25 Zanders Feinpapiere Ag Procede pour marquer des papiers et des cartons
WO2005065956A1 (fr) * 2004-01-05 2005-07-21 Stora Enso Oyj Procede de fourniture de papier ou de carton avec marques d'identification et materiau marque produit par ce procede

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010094838A1 (fr) * 2009-02-20 2010-08-26 Laminating Papers Oy Procédé pour la production d'une toile fibreuse imprégnée comportant des marques, plaque revêtue de la toile fibreuse imprégnée et utilisation de la toile fibreuse imprégnée dans un moule de coulée de béton
DE102009029081A1 (de) 2009-09-02 2011-03-03 Voith Patent Gmbh Lasermarkierung
WO2011026693A1 (fr) 2009-09-02 2011-03-10 Voith Patent Gmbh Marquage au laser
CN102482849A (zh) * 2009-09-02 2012-05-30 沃依特专利有限责任公司 激光标记方法
US10390998B2 (en) 2014-11-07 2019-08-27 The Procter & Gamble Company Process and apparatus for manufacturing an absorbent article using a laser source
JP2018527475A (ja) * 2015-09-23 2018-09-20 ストラ エンソ オーワイジェイ インクなしの印刷用紙
US20180281493A1 (en) * 2015-09-23 2018-10-04 Stora Enso Oyj Printing paper without ink
CN108350663A (zh) * 2015-09-23 2018-07-31 斯道拉恩索公司 无油墨印刷纸
US10639920B2 (en) * 2015-09-23 2020-05-05 Stora Enso Oyj Printing paper without ink
CN108350663B (zh) * 2015-09-23 2021-06-15 斯道拉恩索公司 无油墨印刷纸
US10806635B2 (en) 2016-03-15 2020-10-20 The Procter & Gamble Company Methods and apparatuses for separating and positioning discrete articles
DE102017119819A1 (de) 2017-08-29 2019-02-28 Delfortgroup Ag Verfahren zum Aufbringen von Registermarken auf Umhüllungspapier für Rauchartikel
WO2019042639A1 (fr) 2017-08-29 2019-03-07 Delfortgroup Ag Procédé permettant d'appliquer des marques de repérage sur un papier d'emballage destiné à des articles à fumer
WO2023118615A1 (fr) 2021-12-21 2023-06-29 Lortek S.Coop. Dispositif de traçabilité automatique et dynamique de bobines de papier tissue

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