WO2001085473A1 - Gaufrage reflechissant de surface - Google Patents

Gaufrage reflechissant de surface Download PDF

Info

Publication number
WO2001085473A1
WO2001085473A1 PCT/GB2001/002030 GB0102030W WO0185473A1 WO 2001085473 A1 WO2001085473 A1 WO 2001085473A1 GB 0102030 W GB0102030 W GB 0102030W WO 0185473 A1 WO0185473 A1 WO 0185473A1
Authority
WO
WIPO (PCT)
Prior art keywords
foil
areas
die
image
tone
Prior art date
Application number
PCT/GB2001/002030
Other languages
English (en)
Inventor
Michael Adrian Castleton
Original Assignee
Blockfoil Group Limited
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 Blockfoil Group Limited filed Critical Blockfoil Group Limited
Priority to AU54953/01A priority Critical patent/AU5495301A/en
Priority to GB0226081A priority patent/GB2377675B/en
Publication of WO2001085473A1 publication Critical patent/WO2001085473A1/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B44—DECORATIVE ARTS
    • B44C—PRODUCING DECORATIVE EFFECTS; MOSAICS; TARSIA WORK; PAPERHANGING
    • B44C1/00—Processes, not specifically provided for elsewhere, for producing decorative surface effects
    • B44C1/24—Pressing or stamping ornamental designs on surfaces
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B44—DECORATIVE ARTS
    • B44F—SPECIAL DESIGNS OR PICTURES
    • B44F1/00—Designs or pictures characterised by special or unusual light effects
    • B44F1/08—Designs or pictures characterised by special or unusual light effects characterised by colour effects
    • B44F1/10—Changing, amusing, or secret pictures

Definitions

  • This invention relates to embossing of a reflective surface, particularly a reflective foil, and to the production of images through a foil embossing technique.
  • Simple foil stamping is often used to apply a decorative, reflective foil to a particular part of a printed article.
  • Foil stamping involves the use of a thin sheet of foil and a die. The die which is shaped in accordance with the area of foil to be applied presses the foil against the substrate. Heat and pressure is applied to make the foil adhere permanently to the substrate .
  • Flat foiling is the simplest form of foil stamping. Here a foil is applied to a flat substrate surface without any attempt to create any relief effect on the substrate. Because of the applied pressure, there will be some depression of the substrate surface, but this is minimal.
  • Micro-embossing is a foil stamping technique where the stamping does produce a relief effect on the substrate. If the substrate is sufficiently thick compared with the surface relief pattern, then there is no deformation of the opposite surface of the substrate. The foil follows the contours of the relief effect to give different light reflection characteristics in the different areas. To carry out this technique, the face of the stamping die is formed with the desired relief pattern.
  • Deep embossing is a foil stamping technique where the relief effect actually displaces part of the substrate out of its initial plane, so that the embossed effect can be seen on both the front and the back of the substrate.
  • the invention provides a method of generating an image on a deformable reflective surface using a stamping process in which a die is pressed onto the deformable reflective surface, wherein the die is a half- tone die that has a plurality of first areas raised above a plurality of second areas, the first areas being arranged in a grid pattern and having a common surface, and the second areas defining a lower surface, the first and second areas being of variable size in accordance with the image to be formed.
  • the deformable reflective surface is a reflective foil, and the reflective foil is stamped onto a supporting substrate in the stamping process.
  • the reflective surface may, however, be any reflective surface which may be deformed by the die, for example sheet aluminium, or a metalised substrate, such as a plastic material vacuum coated with aluminium, or a metal film coated paper.
  • the common upper surface of the first areas may, in the case of a flat die, be a plane. It is possible however, that the die may have another shape, which will be similarly reflected in the shape of the common upper surface. For example, the die may have a cylindrical shape.
  • the image may be desirable to produce the image with an overall or a bulk surface relief pattern, varying over a scale at least one order of magnitude larger than the spacing between adjacent second areas.
  • the bulk surface relief pattern may be a shallow or stylised duplicate of the shape of the person's face.
  • the reflective surface, and any substrate will be embossed with the overall or bulk surface relief pattern.
  • the second areas may be formed to a common depth, in which case the lower surfaces will lie on a common plane parallel with the common plane of the upper surface.
  • the second areas have variable depths, as well as variable sizes, which gives the image a greater contrast ratio or tonal range.
  • the invention also provides for the use of a die having the characteristics of a half-tone letterpress printing plate in a foil stamping process to produce a relief image.
  • the foil may be any type of thin metal or metalised material, such as a holographic colour foil, or a single tone foil .
  • Half-tone letterpress ink printing (which produces pictures as opposed to text) is conventionally carried out using a plate etched or otherwise formed into an array of dots separated by troughs.
  • this plate is used for printing, ink adheres to the surface of the dots and is transferred from these dots to the final surface to be printed.
  • the size of the dots varies and the dots are larger in those areas of the final image which are to be dark, and are very small in those parts of the image which are to be very light. This produces a two- dimensional product.
  • This technique produces a visible image through altering the reflective characteristics of the foil over the image area.
  • the image is not the result of refraction or diffraction but merely varying the reflection of the light seen from the image.
  • Conventional inked half-tone letterpress printing uses a tonal range from 5% of the area being inked (in the lightest parts of the image) to 95% of the area being inked (in the darkest parts of the image) .
  • the reflection characteristics produced in a large area where there are no or substantially no dots would be the same as in a large area where there are no or substantially no troughs.
  • a stamping die which has the characteristics of a half-tone letterpress plate but a tonal range of from 0% to 50%, ie the die surfaces occupy between only 0 and 50% on average over any particular area of the die face and the relief surfaces then occupy between 50 and 100% of that area.
  • the invention thus differs from a conventional letterpress printing plate in including areas where there are no dots/troughs (uninterrupted foil reflectivity) , ie 0% tonal range .
  • the material of the substrate needs to be chosen so that it can accept the necessary relief between the dots and the troughs .
  • the invention also provides a foil stamping die having die surfaces and die relief areas arranged on a regular grid pattern, with the areas of the die surfaces varying across the die face.
  • Figure 1 is a schematic plan view of part of a halftone printing plate
  • Figure 2 is a cross section taken on the line II-II through the plate of Figure 1;
  • Figure 3 shows the plate, foil and substrate ready for stamping;
  • Figure 4 is a cross section through a stamped substrate .
  • the cross-section through a printing plate 10 shown in Figure 2 is of a half-tone plate, prepared for printing an image.
  • the figure illustrates the form of the plate with a relief pattern of craters 12 and unetched surface 14.
  • the size of the craters 12 varies across the plate, but the centre of each crater is located on a regular grid pattern.
  • the craters are therefore arranged on a rectangular or a square array.
  • ink is applied to the unetched surface 14.
  • ink is transferred from the plate to the surface to form a corresponding image on the surface.
  • the larger craters, e.g. 12a, 12b are in the parts of the plate where the area of the unetched, ink-carrying, surface 14 is smallest and thus where the printed image is to be lightest .
  • the present invention uses a tonal range of 0% to 50%. This means that the area occupied by craters will vary between nothing, ie no craters at all, to regions where half the surface area is represented by craters.
  • the invention can be applied equally effectively with a tonal range of 50% to 100%. In this case, instead of craters (which are areas below the mean surface level) , we refer to dots (above the mean surface level) .
  • the plate 10 is formed by a photoetching technique. If the original image is a continuous tone photograph, then this is imaged by conventional reprographic processes to create a screened negative or a screened positive (referred to hereinafter as a screened film) of the image. If the original image is a digital file, then conventional computer technology in conjunction with conventional reprographic processes may be used to create the screened film.
  • the half-tone image should have a tonal range of 0% to 50%, and in this range (as can be seen in Figure 1) the largest dots are not so large that they join up with adjacent dots.
  • a resist is laid down on the surface of a copper plate. This resist is exposed to light through the screened film, and the unexposed areas are subsequently developed and washed away leaving some areas still protected by the resist. The unprotected areas are then etched away. This results in a surface configuration of the type shown in Figure 2.
  • the method of the invention works best starting from a high quality image which has good, even contrast.
  • the plate 10 is used as shown in Figure 3, to emboss a substrate 16 with an interposed reflective foil 18. Applying heat and pressure between the plate (die) 10 and the substrate 16 results in a finished product having a cross-section as shown in Figure 4, with the foil following the contours of the craters 12 and unetched surface 14.
  • the reflective nature of the foil, and the application of this foil to the embossed surfaces on the substrate can result in a visual image which has such fine definition that it is of almost photographic quality (monochrome) , and thus is eminently suitable for displaying portrait images such as are required, for example, on identity documents .
  • the fineness of the image will depend on the spacing of the grid pattern on which the dots are arranged.
  • stamping foil can now follow very fine contours, and grid patterns as fine as about 3.9 to 11.8 dots per millimetre
  • Any suitable method can be used for producing the halftone letterpress plate.
  • the die should be of a material which will accept the desired level of definition and (especially for continuous production) be capable of withstanding wear. Copper plates are particularly suitable.
  • the substrate should be chosen so that it can accept the emboss, and preferably so that any recovery of the material after the emboss does not noticeably reduce the fineness of the image.
  • the process can be used with a wide range of materials.
  • the reflective surface can be reflectively coated plastic or paper, or even aluminium foil.

Landscapes

  • Printing Methods (AREA)
  • Credit Cards Or The Like (AREA)

Abstract

L'invention concerne un procédé de gaufrage de feuille métallique par le biais d'une matrice (10) ayant les caractéristiques primaires d'une planche simili de typographie. Cette matrice est utilisée dans l'opération de gaufrage sur feuille métallique pour reproduire une image sur un substrat (16). La matrice offre une gamme de tonalités dans une fourchette allant de 0 à 50 % ou de 50 % à 100 %.
PCT/GB2001/002030 2000-05-10 2001-05-10 Gaufrage reflechissant de surface WO2001085473A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
AU54953/01A AU5495301A (en) 2000-05-10 2001-05-10 Reflective surface embossing
GB0226081A GB2377675B (en) 2000-05-10 2001-05-10 Reflective surface embossing

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB0011220A GB0011220D0 (en) 2000-05-10 2000-05-10 Foil embossing
GB0011220.1 2000-05-10

Publications (1)

Publication Number Publication Date
WO2001085473A1 true WO2001085473A1 (fr) 2001-11-15

Family

ID=9891285

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB2001/002030 WO2001085473A1 (fr) 2000-05-10 2001-05-10 Gaufrage reflechissant de surface

Country Status (3)

Country Link
AU (1) AU5495301A (fr)
GB (2) GB0011220D0 (fr)
WO (1) WO2001085473A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012082391A1 (fr) * 2010-12-14 2012-06-21 3M Innovative Properties Company Images et procédé de fabrication associé
WO2012079674A1 (fr) * 2010-12-15 2012-06-21 Merck Patent Gmbh Procédé de production de motifs tridimensionnels dans des revêtements
US9950048B2 (en) 2007-07-27 2018-04-24 Immatics Biotechnologies Gmbh Immunogenic epitopes for immunotherapy
WO2023071972A1 (fr) * 2021-10-26 2023-05-04 Giesecke+Devrient Mobile Security Gmbh Procédé d'estampage à chaud

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3749471A (en) * 1970-07-16 1973-07-31 Fj Warren Ltd Method of producing an irridescent pattern on the surface of a sheet or other object and sheets or objects having patterned surface produced by this method
EP0194042A2 (fr) * 1985-02-07 1986-09-10 Thomas De La Rue and Company Ltd. Articles pourvus d'un marquage en relief

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3749471A (en) * 1970-07-16 1973-07-31 Fj Warren Ltd Method of producing an irridescent pattern on the surface of a sheet or other object and sheets or objects having patterned surface produced by this method
EP0194042A2 (fr) * 1985-02-07 1986-09-10 Thomas De La Rue and Company Ltd. Articles pourvus d'un marquage en relief

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9950048B2 (en) 2007-07-27 2018-04-24 Immatics Biotechnologies Gmbh Immunogenic epitopes for immunotherapy
WO2012082391A1 (fr) * 2010-12-14 2012-06-21 3M Innovative Properties Company Images et procédé de fabrication associé
CN103260897A (zh) * 2010-12-14 2013-08-21 3M创新有限公司 图像和其制造方法
CN103260897B (zh) * 2010-12-14 2016-08-24 3M创新有限公司 图像和其制造方法
WO2012079674A1 (fr) * 2010-12-15 2012-06-21 Merck Patent Gmbh Procédé de production de motifs tridimensionnels dans des revêtements
CN103442904A (zh) * 2010-12-15 2013-12-11 默克专利股份有限公司 用于在涂层中制造三维图案的方法
US8993103B2 (en) 2010-12-15 2015-03-31 Merck Patent Gmbh Process for creating three-dimensional patterns in coatings
CN103442904B (zh) * 2010-12-15 2016-06-29 默克专利股份有限公司 用于在涂层中制造三维图案的方法
WO2023071972A1 (fr) * 2021-10-26 2023-05-04 Giesecke+Devrient Mobile Security Gmbh Procédé d'estampage à chaud

Also Published As

Publication number Publication date
GB2377675B (en) 2003-07-23
AU5495301A (en) 2001-11-20
GB0226081D0 (en) 2002-12-18
GB2377675A (en) 2003-01-22
GB0011220D0 (en) 2000-06-28

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