WO1983000653A1 - Production de feuilles thermoplastiques estampees - Google Patents

Production de feuilles thermoplastiques estampees Download PDF

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Publication number
WO1983000653A1
WO1983000653A1 PCT/AU1982/000136 AU8200136W WO8300653A1 WO 1983000653 A1 WO1983000653 A1 WO 1983000653A1 AU 8200136 W AU8200136 W AU 8200136W WO 8300653 A1 WO8300653 A1 WO 8300653A1
Authority
WO
WIPO (PCT)
Prior art keywords
embossed
film
strip
design
pattern
Prior art date
Application number
PCT/AU1982/000136
Other languages
English (en)
Inventor
Scientific And Industrial Research ... Commonwealth
Bank Australia Reserve
Original Assignee
Solomon, David, Henry
Girolamo, Mario
Ross, John, Bentley
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 Solomon, David, Henry, Girolamo, Mario, Ross, John, Bentley filed Critical Solomon, David, Henry
Priority to GB08325457A priority Critical patent/GB2125341B/en
Priority to NL8220286A priority patent/NL8220286A/nl
Priority to AU87664/82A priority patent/AU8766482A/en
Publication of WO1983000653A1 publication Critical patent/WO1983000653A1/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/40—Manufacture
    • B42D25/405—Marking
    • B42D25/425—Marking by deformation, e.g. embossing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C59/00—Surface shaping of articles, e.g. embossing; Apparatus therefor
    • B29C59/02—Surface shaping of articles, e.g. embossing; Apparatus therefor by mechanical means, e.g. pressing
    • B29C59/026—Surface shaping of articles, e.g. embossing; Apparatus therefor by mechanical means, e.g. pressing of layered or coated substantially flat surfaces
    • 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
    • B41M1/22—Metallic printing; Printing with powdered inks
    • 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
    • B41M1/24—Inking and printing with a printer's forme combined with embossing
    • 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
    • B41M3/14—Security printing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/20—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof characterised by a particular use or purpose
    • B42D25/29—Securities; Bank notes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/40—Manufacture
    • B42D25/45—Associating two or more layers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/722—Decorative or ornamental articles
    • B29L2031/7224—Holograms
    • B42D2033/04—
    • B42D2033/10—
    • B42D2033/30—
    • B42D2035/16—
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/30—Identification or security features, e.g. for preventing forgery
    • B42D25/328—Diffraction gratings; Holograms

Definitions

  • This invention relates generally to the production of embossed thermoplastic film or sheet material and, more particularly, to the structure and to the method of production of embossed polymeric transfer foils, sheets and the like. It is particularly applicable to the production of thin, metallised and embossed thermoplastic transfer foils having unique or unusual optical characteristics well-suited for use as security devices in bank-notes, travellers cheques and other security tokens. Such uses and tokens are described in Australian Patent No 488,652. However, the products and methods of this invention are not necessarily confined to such uses and the invention may be simply employed to produce embossed film. BACKGROUND ART
  • thermoplastic sheet materials may be impressed with surface textures or patterns by passing them through the nip of heated metal embossing rolls, or between heated platens, into the surface of which the desired . texture or pattern has been etched.
  • thermoplastic film whichever technique is employed, however, it is most difficult to emboss thin thermoplastic film (less than about 10 microns thick). Not only are such materials difficult to handle through hot rolls or platens without severe
  • the present invention seeks, generally, to provide a technique for embossing thin film and, more particularly, for producing a transfer foil, by which technique embossed patterns of high line density can be imparted to thin films suitable for use in the manufacture of security devices for incorporation in bank-notes or other security feocens, or for use in decorative or novelty _____ mcvt ⁇ rials.
  • the general technique of the present invention is based upon the surprising discovery that polymeric sheet materials may themselves be used as the embossing medium for thermoplastic materials without significant degradation of the embossed pattern during use, provided the material of the embossing medium has a softening point which is relatively high with respect to that of the embossed material ⁇
  • the present invention comprises a technique for embossing a thin film of thermoplastic material characterised in that the film is supported on a carrier sheet of flexible material and brought into contact under pressure and heat with the surface of a flexible strip of polymeric material having a pattern, design or texture embossed therein, whereby the film is impressed with said pattern, design or texture, the flexible material of said carrier sheet and said strip having softening temperatures substantially above that of the film and being of substantially greater thickness than the film.
  • the thin product film is thus embossed by pressing it between the embossing strip and the carrier sheet under the action of heat and pressure and, after embossing, it may be removed from the carrier sheet.
  • the thin film will be less than 10 microns thick while the carrier sheet and the embossing strip will be greater than 20 (and usually greater than 50) microns thick.
  • the film and the strip prefferably be brought into contact by passing them together through the nip of a pair of rollers, at least one of which is heated. And in such an arrangement it is also preferable for the strip to have the form of a continuous flexible belt.
  • the use of a continuous belt in conjunction with heated pressure rollers allows the rapid production of embossed thermoplastic film and that, since the embossing belt can be produced by the conventional step-and-repeat platen-embossing method, the embossing pattern may be continuous, uninterrupted or of a regular nature. Furthermore, it has been found that when a thin coating or layer of low softening point thermoplastic material on a carrier is embossed by this method, it allows highly intricate fine-line patterns such as diffraction gratings to be transferred to the product sheet.
  • the present invention comprises a method of forming a transfer foil suitable for use in security tokens or the like, characterised in that a thin film of thermoplastic material is formed and embossed on a carrier sheet according to the more general aspect of this invention, and further characterised in that the embossed surface of the film is at least partially coated to render the embossed design more readily visible and in that the surface of the coated and embossed film is sealed with a layer of transparent thermoplastic material which fills the indentations thereof. If a metal coating is used to render the design more visible, it may be subsequently oxidised to give a part-reflective, part-transmission grating.
  • the embossed layer may be coated with a very thin layer of a material - for example calcium fluoride - having a sufficiently different refractive index to the embossed layer to form a transmission grating.
  • the metallised or coated surface of the embossed layer is coated with the second layer of thermoplastic material so as to fill the exposed indentations of the embossed impression and prevent access to the embossed pattern.
  • This layer also provides the means whereby the embossed and metallised layer can be made to adhere to a suitable recipient substrate, this being done by the application of heat and pressure to the carrier sheet.
  • both - or at least one - of said layers of thermoplastic material adjacent to the embossed and coated surface are transparent.
  • thermoplastic layer Being itself very thin and being firmly bonded to the extremely thin and delicate embossed surface, either thermoplastic layer would be very difficult, if not impossible, to remove by mechanical means without damaging the embossed layer. Since both layers are of the same or very similar chemical compositions, any attempt to remove one layer by the use of a solvent is likely to affect the other layer and cause disruption of the embossed surface.
  • the method of the present invention is well-suited to the production of security devices for use in bank-notes or like security tokens.
  • the invention also embraces novel transfer foils of the type described.
  • Figure 1 is a series of diagrams illustrating the four principal steps involved in the manufacture and use of a transfer foil formed in accordance with the present invention.
  • Figure 2 is a diagrammatic representation of the final transfer step, showing the transfer foil and the recipient substrate in longitudinal section.
  • the particular embodiment chosen involves the production of a transfer foil containing a unique diffraction grating of high line density for use on security tokens or the like. In such applications, it is essential to make it as difficult as possible for copyists to gain access to the diffraction grating by separating the layers of the foil. It will be appreciated also that a key security element is the unique design of the diffraction grating itself which cannot be reproduced without access to major items of equipment such as electron beam etchers and complex computer programs driving such equipment. However, the production of the unique diffraction grating and the preparation of the master does not form part of the present invention. Conventional diffraction gratings, produced on circular turning machines or by linear ruling engines, could be used and will have value for decorative purposes.
  • FIG. 1 the Figure comprises three diagrams (A to C) illustrating three steps in the process for the production of a transfer foil for a security token in the form of a diffraction grating. A number of intermediate steps are not illustrated but will be mentioned.
  • Figure 1A is illustrative of the broadest aspect of the invention i.e. the method by which a coated thermoplastic strip 20 can be embossed in a continuous process by the use of the embossing belt 10 it being understood that the coating of thermoplastic strip 20 has a softening point significantly below that of the belt 10.
  • a nylon embossing belt it is convenient to use an acrylic copolymer coated onto a poly(ethylene terephthalate) strip 20, the coating being of between 2 and 4 micron and the strip being between 20 and 30 micron in thickness.
  • the strip is carried from a pay-off roll 22 to a take-up roll 24 through the nip of a pair of rollers 26 and 28, of which the former is cooled and the latter is heated, which are pressed together during operation.
  • the upper roller 28 carries the belt 10 which is also supported by idler roll 30.
  • the pressure rolls 26 and 28 rotate to draw strip 20 from the pay-off reel 22 through the 'nip and press it into contact with the embossing belt 10. In this way, an impression of the series of diffraction gratings on belt 10 is transferred onto the upper surface of the thermoplastic strip 20.
  • the coated and embossed thermoplastic strip 20 is housed within a vacuum chamber 32 and transferred from a pay-off reel 34 to take-up reel 36 so as to continuously expose an intermediate section to aluminium vapours generated by the evaporation of aluminium 38 from crucibles or boats 40.
  • Strip 20 is wound so that the embossed side is lowermost.
  • This technique of metallising plastic film is well-known, as are the methods of preparing the surface of the film for adhesion of the metal layer. In any event, it is important that deposition of the metal should be uniform over the surface of strip 20.
  • the embossed and metallised side of the strip 20 is coated with another thin (2-5 micron) layer of thermoplastic material of similar composition and solubility to the first (non-embossed) coating.
  • This layer serves to fill the embossed indentations and prevent access to the metallised surface by would-be copyists.
  • the first (embossed) coating is identified by reference numeral 42, the metal layer by 44 and the covering thermoplastic layer by 46.
  • layer 46 not only serves to fill the embossed pattern but also acts as a heat-activated adhesive by which the device can be stuck onto a bank-note substrate.
  • the embossed, coated and metallised thermoplastic strip of material 20 is used as a transfer foil to impart selected sections of the metallised coating (i.e. the security devices) onto a product substrate 50 by hot stamping, the hot stamping plattens being shown diagramatically at 52 and 54 in Figure 1C.
  • the strip 20 is a sheet of polyester or cellulose ester
  • coating 42 is formed from an acrylic copolymer
  • coating 46 is formed from an acrylic copolymer of similar properties to coating 42.
  • transfer of security devices from the strip 20 to the product substrate 50 is readily effected by a hot stamping process in which heated platens or rollers squeeze strip 20 and substrate 50 together under pressure at selected spots, where the pressure is applied, transfer is effected and where it is not applied the diffraction grating 44 and its enclosing layers 42 and 46 remain adhered to the polyester or cellulose ester base - i.e. the backing strip 20 of the transfer foil.

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Business, Economics & Management (AREA)
  • Accounting & Taxation (AREA)
  • Finance (AREA)
  • Mechanical Engineering (AREA)
  • Shaping Of Tube Ends By Bending Or Straightening (AREA)
  • Credit Cards Or The Like (AREA)
  • Laminated Bodies (AREA)
  • Diffracting Gratings Or Hologram Optical Elements (AREA)

Abstract

Production d'un film thermoplastique estampé. Un laminé (20) comprenant le film thermoplastique fin qui doit être estampé, supporté sur une feuille de support flexible est emmené en contact sous des conditions de chaleur et pression avec une bande d'un matériau polymère (10) portant un dessin ou motif en relief. Cette opération peut être effectuée en amenant le laminé et la bande au travers d'une paire de rouleaux chauffés (26 et 28), la bande (10) ayant la forme d'une bande continue portée par les rouleaux (28 et 30). La feuille de support et la bande sont constituées d'un matériau qui est sensiblement plus épais que le film à estamper et possède également un point de ramollissement sensiblement plus élevé. Le film estampé de cette manière peut être transformé en une feuille de transfert en donnant au motif en relief un revêtement, p.ex. en métal et en remplissant les creux avec une couche d'un matériau polymère transparent, qui peut également constituer un moyen d'adhésion sur un substrat tel qu'un billet de banque ou autre pièce de sécurité.
PCT/AU1982/000136 1981-08-24 1982-08-24 Production de feuilles thermoplastiques estampees WO1983000653A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
GB08325457A GB2125341B (en) 1981-08-24 1982-08-24 Production of embossed thermoplastic sheets
NL8220286A NL8220286A (nl) 1981-08-24 1982-08-24 Werkwijze voor het vervaardigen van relieffilms.
AU87664/82A AU8766482A (en) 1981-08-24 1982-08-24 Production of embossed transfer foils and the like

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
AUPF038681 1981-08-24
AUPF0384 1981-08-24
AUPF038481 1981-08-24
AUPF0386810824 1981-08-24

Publications (1)

Publication Number Publication Date
WO1983000653A1 true WO1983000653A1 (fr) 1983-03-03

Family

ID=25642486

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/AU1982/000136 WO1983000653A1 (fr) 1981-08-24 1982-08-24 Production de feuilles thermoplastiques estampees

Country Status (6)

Country Link
DE (1) DE3248990T (fr)
GB (1) GB2125341B (fr)
NL (1) NL8220286A (fr)
NZ (1) NZ201692A (fr)
SE (1) SE435695B (fr)
WO (1) WO1983000653A1 (fr)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2535864A1 (fr) * 1982-11-08 1984-05-11 American Bank Note Co Procede de reproduction de figures de diffraction de la lumiere, et produits ainsi obtenus
DE3545744A1 (de) * 1985-12-21 1987-06-25 Hymmen Theodor Gmbh Verfahren und vorrichtung zum herstellen einer druck-, glanz- oder praegestruktur auf pressblechen, -stempeln, -walzen, -folien o.dgl.
US4893887A (en) * 1983-12-12 1990-01-16 E. I. Du Pont De Nemours And Company Holographic image transfer process
DE3248989C2 (fr) * 1981-08-24 1992-01-23 David H Solomon
WO1992000855A1 (fr) * 1990-07-12 1992-01-23 Thomas De La Rue & Company Limited Ameliorations relatives a des tableaux de signature
US5438928A (en) * 1990-01-31 1995-08-08 Thomas De La Rue & Company Limited Signature panels
US5591527A (en) * 1994-11-02 1997-01-07 Minnesota Mining And Manufacturing Company Optical security articles and methods for making same
EP0741370B1 (fr) * 1995-05-05 1998-08-19 Landis & Gyr Technology Innovation AG Procédé pour appliquer un élément de sécurité sur un substrat
WO2004014654A1 (fr) * 2002-07-31 2004-02-19 Day International, Inc. Systeme de presse offset permettant d'imprimer avec un developpement variable et procede d'exploitation
WO2015161834A1 (fr) * 2014-04-23 2015-10-29 Merit Chain Limited Procédé de fabrication de stratifié et stratifié correspondant

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB861062A (en) * 1957-08-02 1961-02-15 Konrad Hornschuch A G Improvements in or relating to the manufacture of embossed sheet material
GB861061A (en) * 1957-08-01 1961-02-15 Konrad Hornschuch A G Improvements in or relating to the manufacture of embossed sheet material
GB897313A (en) * 1958-04-04 1962-05-23 Carpenter L E Co Embossing thermoplastic film
GB909352A (en) * 1958-01-07 1962-10-31 Robert John Trewella Embossing, Perforating and Cutting Thermoplastic Sheet Material.
AU488652B2 (en) * 1973-09-26 1976-04-01 Commonwealth Scientific And Industrial Research Organisation Improvements in or relating to security tokens
US4096216A (en) * 1975-10-16 1978-06-20 Izon Corporation Method of making microfiche laminate having apertures with doublet lenses
GB1568563A (en) * 1976-10-29 1980-06-04 Kurz W Hot-stamping film and process for its manufacture

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB861061A (en) * 1957-08-01 1961-02-15 Konrad Hornschuch A G Improvements in or relating to the manufacture of embossed sheet material
GB861062A (en) * 1957-08-02 1961-02-15 Konrad Hornschuch A G Improvements in or relating to the manufacture of embossed sheet material
GB909352A (en) * 1958-01-07 1962-10-31 Robert John Trewella Embossing, Perforating and Cutting Thermoplastic Sheet Material.
GB897313A (en) * 1958-04-04 1962-05-23 Carpenter L E Co Embossing thermoplastic film
AU488652B2 (en) * 1973-09-26 1976-04-01 Commonwealth Scientific And Industrial Research Organisation Improvements in or relating to security tokens
US4096216A (en) * 1975-10-16 1978-06-20 Izon Corporation Method of making microfiche laminate having apertures with doublet lenses
GB1568563A (en) * 1976-10-29 1980-06-04 Kurz W Hot-stamping film and process for its manufacture

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3248989C2 (fr) * 1981-08-24 1992-01-23 David H Solomon
FR2535864A1 (fr) * 1982-11-08 1984-05-11 American Bank Note Co Procede de reproduction de figures de diffraction de la lumiere, et produits ainsi obtenus
US4893887A (en) * 1983-12-12 1990-01-16 E. I. Du Pont De Nemours And Company Holographic image transfer process
DE3545744A1 (de) * 1985-12-21 1987-06-25 Hymmen Theodor Gmbh Verfahren und vorrichtung zum herstellen einer druck-, glanz- oder praegestruktur auf pressblechen, -stempeln, -walzen, -folien o.dgl.
US5438928A (en) * 1990-01-31 1995-08-08 Thomas De La Rue & Company Limited Signature panels
WO1992000855A1 (fr) * 1990-07-12 1992-01-23 Thomas De La Rue & Company Limited Ameliorations relatives a des tableaux de signature
US5591527A (en) * 1994-11-02 1997-01-07 Minnesota Mining And Manufacturing Company Optical security articles and methods for making same
US5743981A (en) * 1994-11-02 1998-04-28 Minnesota Mining And Manufacturing Company Optical security articles and methods for making same
EP0741370B1 (fr) * 1995-05-05 1998-08-19 Landis & Gyr Technology Innovation AG Procédé pour appliquer un élément de sécurité sur un substrat
WO2004014654A1 (fr) * 2002-07-31 2004-02-19 Day International, Inc. Systeme de presse offset permettant d'imprimer avec un developpement variable et procede d'exploitation
US7066088B2 (en) 2002-07-31 2006-06-27 Day International, Inc. Variable cut-off offset press system and method of operation
US7503256B2 (en) 2002-07-31 2009-03-17 Day International, Inc. Variable cut-off offset press system and method of operation
WO2015161834A1 (fr) * 2014-04-23 2015-10-29 Merit Chain Limited Procédé de fabrication de stratifié et stratifié correspondant

Also Published As

Publication number Publication date
SE8305111L (sv) 1983-09-22
NL8220286A (nl) 1983-12-01
SE8305111D0 (sv) 1983-09-22
NZ201692A (en) 1985-07-12
DE3248990T (de) 1984-03-22
GB8325457D0 (en) 1983-10-26
GB2125341A (en) 1984-03-07
SE435695B (sv) 1984-10-15
GB2125341B (en) 1985-06-05

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