EP3218189A1 - Web processing system and method for processing a web - Google Patents

Web processing system and method for processing a web

Info

Publication number
EP3218189A1
EP3218189A1 EP15784348.3A EP15784348A EP3218189A1 EP 3218189 A1 EP3218189 A1 EP 3218189A1 EP 15784348 A EP15784348 A EP 15784348A EP 3218189 A1 EP3218189 A1 EP 3218189A1
Authority
EP
European Patent Office
Prior art keywords
printing
web
pattern
printing cylinder
processing system
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
EP15784348.3A
Other languages
German (de)
French (fr)
Other versions
EP3218189B1 (en
Inventor
Juan Francisco OCHOA CARO
Olaf JANSON
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.)
JT International SA
Original Assignee
JT International SA
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 JT International SA filed Critical JT International SA
Priority to PL15784348T priority Critical patent/PL3218189T3/en
Publication of EP3218189A1 publication Critical patent/EP3218189A1/en
Application granted granted Critical
Publication of EP3218189B1 publication Critical patent/EP3218189B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F11/00—Rotary presses or machines having forme cylinders carrying a plurality of printing surfaces, or for performing letterpress, lithographic, or intaglio processes selectively or in combination
    • B41F11/02—Rotary presses or machines having forme cylinders carrying a plurality of printing surfaces, or for performing letterpress, lithographic, or intaglio processes selectively or in combination for securities
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F13/00—Common details of rotary presses or machines
    • B41F13/02—Conveying or guiding webs through presses or machines
    • B41F13/025—Registering devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F9/00—Rotary intaglio printing presses
    • B41F9/003—Web printing presses
    • 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
    • B41M1/02—Letterpress printing, e.g. book printing
    • B41M1/04—Flexographic 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
    • B41M1/06—Lithographic 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
    • B41M1/14—Multicolour 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
    • B41M3/008—Sequential or multiple printing, e.g. on previously printed background; Mirror printing; Recto-verso printing; using a combination of different printing techniques; Printing of patterns visible in reflection and by transparency; by superposing printed artifacts
    • 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
    • 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

Definitions

  • the invention pertains to a web processing system and a method for processing a web, particularly for printing random patterns or layouts onto a continuous web of material.
  • Articles of value are usually protected by some sort of authenticity measures that are put into place by the manufacturer to prevent the forgery of such an article.
  • cigarette boxes may be tagged in way that allows to track its origin and to confirm its authenticity.
  • Conventionally employed techniques involve methods of recording identification codes or the like on cardboard or paper using sophisticated printing techniques to tag the desired articles of value with a seal of genuineness.
  • Those printing techniques are hard to reproduce for imitators or plagiarists since the techniques either involve specific knowledge about the manufacturing process or the use of hard to obtain materials.
  • the document EP 1 125 758 Al discloses a system for tagging sheets of paper with a random pattern, the system using a series of printing rollers that may apply phase shifted random patterns to one or both sides of the sheet, Summary of the invention
  • One idea of the present invention is to provide a web processing system that is able to generate a patterned image on the web which patterned image is truly random or at least pseudo-random in nature
  • a first aspect of the present invention therefore relates to a processing system for a web, comprising a conveying mechanism configured to feed a continuous web of material along a conveying path in the processing system; a first printing cylinder having a first diameter and a first printing pattern, the first printing cylinder being arranged adjacent to the conveying path and configured to print a first image pattern on at least one surface of the continuous web; at least one second printing cylinder having a second diameter different from the first diameter and a second printing pattern, the second printing cylinder being arranged adjacent to the conveying path and configured to print a second image pattern on top of the first image pattern on the continuous web; and a system controller coupled to the conveying mechanism and configured to control the conveying mechanism according to at least one registration procedures, wherein the system controller is configured to selectively disable at least one of the registration procedures when printing the first and second image patterns to print a final random image pattern on the at least one surface of the continuous web.
  • a second aspect of the present invention relates to a method for processing a web, the method comprising conveying a continuous web of material along a conveying path in a processing system by a conveying mechanism; printing a first image pattern on at least one surface of the continuous web using a first printing cylinder having a first diameter and a first printing pattern; printing a second image pattern on top of the first image pattern on the continuous web using at least one second printing cylinder having a second diameter different from the first diameter and a second printing pattern; and selectively disabling at least one registration procedure for the conveying mechanism when printing the first and second image patterns to print a final random image pattern on the at least one surface of the continuous web.
  • a web of material comprises a random pattern printed on a surface thereof, wherein the random pattern is obtained according to the method of the first aspect of the invention.
  • the first printing pattern and/or the second printing pattern may be different.
  • the registration procedures may comprise one or more of control of web conveying speed, control of lateral web alignment, control of conveying path length between the printing cylinders and control of web tension.
  • system controller may further be coupled to the first printing cylinder and the at least one second printing cylinder and configured to drive the first printing cylinder and the at least one second printing cylinder at different rotational speed.
  • system controller may further be configured to drive the first printing cylinder and the at least one printing cylinder at the same tangential speed.
  • the first image pattern and/or the second image pattern may comprise random image patterns.
  • the first printing pattern and the second printing pattern may comprise different patterns.
  • the registration procedures may comprise one or more of control of web conveying speed, control of lateral web alignment, control of conveying path length between the printing cylinders and control of web tension.
  • the continuous web material may comprise one of cardboard, paper, cellulose, textile fabric, plastic, metal or a laminate combination thereof.
  • the first printing cylinder and the at least one second printing cylinder may be driven at different rotational speed.
  • the first printing cylinder and the at least one second printing cylinder may be driven at the same tangential speed.
  • printing the first and second printing pattern may comprise transferring compositions comprising at least one of an ink, a varnish and a wax onto the at least one surface of the web.
  • the web according to the third aspect of the invention may in an embodiment include separation means adapted to allow separation of at least one sheet from the web, the at least one sheet comprising a portion of the printed random pattern.
  • the separation means may comprise score lines, perforation lines or die cuts formed in the material of the web.
  • the web material according to the third aspect of the invention may in an embodiment comprise one of cardboard, paper, cellulose, textile fabric, plastic, metal or a laminate combination thereof.
  • a package comprising at least one part thereof made from a web may be manufactured using a web of material according to the third aspect of the invention.
  • Fig. 1 shows a schematical illustration of a processing system in isometric view according to one embodiment of the invention.
  • Fig. 2 schematically illustrates a portion of a base web according to a further embodiment of the invention.
  • Fig. 3 depicts a functional block diagram of stages in a method for processing a web according to yet another embodiment of the invention.
  • printing machines and printing systems are generally intended to comprise any combination or structural arrangement of units, modules and registers that are able to convey a web to be processed along a conveying path within the apparatus.
  • the printing apparatuses may comprise any components that are adapted to imprint, stamp or presswork patterns, images, text or coloured areas onto one or both sides of the web being processed.
  • the printing apparatus may comprise one or more of laser beam devices, developing devices, transfer devices, fixation devices, cutting devices, folding devices and similar conventionally known components in gravure and offset printing.
  • Fig. 1 schematically illustrates a processing system 100.
  • the processing system 100 may particularly be configured to process and produce printed webs Wp of material, the web Wp comprising material such as cardboard, paper, cellulose, textile fabric, plastic, metal or a laminate combination thereof.
  • the processing system 100 generally comprises a plurality of processing stages 12 that are equipped with rollers or feed units, generally denoted with the reference sign 10 in Fig. 1.
  • the rollers 10 form part of a conveying mechanism 11 that is configured to feed a continuous web W of material along a conveying path in the processing system 100.
  • Fig. 2 illustrates a functional view of a processing system for processing webs W and may be seen as conceptual depiction of the processing system 100 in Fig. 1.
  • the web W may be input to the processing system at a system input 8, conveyed through the various processing stages 12 and output as printed web Wp at a system output 9,
  • the processing system 100 comprises a first printing cylinder 1 having a first diameter dl and a first printing pattern formed thereon.
  • the first printing cylinder 1 is arranged adjacent to the conveying path and configured to print a first image pattern, i.e. a printed image of the printing pattern of the first printing cylinder, on at least one surface of the continuous web W.
  • the first printing cylinder 1 is configured to print the first image pattern on the bottom surface of the web W running between the first printing cylinder 1 and a corresponding pressure roller 4.
  • the processing system 100 further comprises at least one second printing cylinder 2 having a second diameter d2 different from the first diameter dl and a second printing pattern formed thereon.
  • the second diameter d2 may be larger than the first diameter dl.
  • the second printing cylinder 2 is arranged in series with the first printing cylinder 1 and may be arranged downstream of the first printing cylinder 1 in the conveying path of the web W.
  • the second printing cylinder 2 is likewise arranged adjacent to the conveying path and is configured to print a second image pattern, i.e. a printed image of the second printing pattern of the second printing cylinder, on top of the first image pattern on the continuous web W.
  • the second printing cylinder 2 may be configured to print the second image pattern on the bottom surface of the web W running between the second printing cylinder 2 and a corresponding pressure roller 5..
  • a third printing cylinder 3 downstream of the second printing cylinder 2, the third printing cylinder 3 having a diameter different from the diameter of the first and/or second printing cylinder 1 and 2, and preferably a third printing pattern formed thereon.
  • a corresponding pressure roller 6 may be provided in order to have the third printing cylinder 3 print a third image pattern, i.e. a printed image of the third printing pattern of the third printing cylinder, on a surface of the web W running between the third printing cylinder 3 and the pressure roller 6.
  • the number of printing cylinders 1, 2 and 3 is not limited to two or three, but may instead be any desired number greater than two.
  • the first printing pattern and/or the second printing pattern may be printed on the web W as image patterns or layouts, for example as ornamental designs or lines, dots or geometrical shapes in various colours and/or line thickness.
  • the first printing pattern and the second printing pattern may for example be different patterns providing a final image pattern made of an overlapping of the first and second image patterns on the web W, i.e. the different printing cylinders 1, 2 and 3 print different image patterns on top of each other.
  • the printing cylinders 1, 2 and 3 may be configured to transfer compositions in liquid form onto the at least one surface of the web W, such as ink, varnish or wax.
  • the processing system 100 may comprise a drying module downstream of each of the printing cylinders 1, 2 and 3 that is configured to dry the compositions in liquid form printed on the web W.
  • the processing system 100 further comprises a system controller 7 which is coupled to the conveying mechanism IX and the printing cylinders 1, 2 and 3.
  • the system controller 7 is on one hand responsible for control of the printing cylinders 1, 2 and 3.
  • the system controller 7 may be configured to drive the printing cylinders 1, 2 and 3 at different rotational speed.
  • the system controller 7 may adapt the rotational speed of each of the printing cylinders 1, 2 and 3 in such a way that the printing cylinders 1, 2 and 3 are driven at the same tangential speed. This way, the speed of the web W passing by the printing cylinders 1, 2 and 3 will remain constant throughout the whole printing process.
  • the system controller 7 is configured to control the conveying mechanism 11 according to at least one registration procedure.
  • registrations procedures may for example include control of web conveying speed, control of lateral web alignment, control of conveying path length between the printing cylinders and control of web tension.
  • the system controller 7 is able to provide a certain randomness in the printing parameters of the processing system 100, thereby introducing a degree of ⁇ reproducibility to the printed patterns.
  • each of the first second image patterns has a certain degree of randomness due to the granted ability for the web W to move out of registry over the first and/or second and/or third printing rollers.
  • each of the first, second and third image patterns are random or at least pseudo-random and the final image pattern obtained at the outlet 9 of the processing system 100, which is made of a combination of the first, second and third image patterns is also random or at least pseudo-random.
  • the printed web Wp is therefore printed with a unique final image pattern, which is therefore very hard to reproduce,
  • the processing system 100 may be used to print continuous webs Wp of material that include a truly or at least pseudo-random pattern printed on a surface thereof.
  • the web Wp may for example comprise separation means, such as score lines, perforation lines or die cuts formed in the material of the web Wp, that are adapted to allow separation of at least one sheet from the web Wp. Each separated sheet then comprises a portion of the printed random pattern. Such sheets may subsequently be used in manufacturing or tagging a package, for example a cigarette box.
  • Fig. 3 schematically illustrates a block diagram of a method M for processing a continuous web of material, such as the web W of Figs. 1 and 2.
  • the method M may particularly be implemented with a web processing system, such as the processing system 100 as illustrated in and explained in conjunction with Figs, 1 and 2,
  • the method M may comprise at Ml the process of conveying a continuous web W of material along a conveying path in a processing system 100 by a conveying mechanism 11.
  • the web W may for example be made from a material comprising one of cardboard, paper, cellulose, textile fabric, plastic, metal or a laminate combination thereof.
  • the conveying mechanism 11 may for example comprise a number of rollers and web feed modules, such as rollers 10.
  • the conveying mechanism may in particular be distributed over a series of processing stages 12 of the processing system 100.
  • a first image pattern is printed on at least one surface of the continuous web W, for example the upper surface, using a first printing cylinder 1 having a first diameter dl and a first printing pattern.
  • a second image pattern may be printed on top of the first image pattern on the continuous web W using at least one second printing cylinder 1 having a second diameter dl different from the first diameter dl and a second printing pattern, preferably different from the first printing pattern.
  • the printing processes of M2 and 3 may for example comprise transferring compositions in liquid form, such as ink, varnish or wax, onto the at least one surface of the web W.
  • a fourth stage M4 while the first and second image patterns are printed on the web W by the printing cylinders 1, 2 and 3, at least one registration procedure for the conveying mechanism 11 in the processing system 100 may be selectively disabled.
  • the processing system 100 may be under control of a system controller 7 that controls various registration procedures in the system such as the control of web conveying speed, the control of lateral web alignment, the control of conveying path length between the printing cylinders 1, 2 and 3, and the control of web tension. Due to disabling at least one registration procedure for the conveying mechanism 11 the first and second printing pattern of the printing cylinders may each provide random image patterns onto the web W. In order to create as much randomness in the resulting overall final image pattern on the web W, the first printing pattern and the second printing pattern may each provide different image patterns.
  • the first printing cylinder 1 and the at least one printing cylinder 2, 3 may be driven at different rotational speed, but at the same tangential speed. This ensures that the sequence of the first and second image patterns is randomly shifted with respect to each other.
  • having the first and second printing cylinders 1, 2 and 3 run at the same tangential speed will guarantee a constant web speed of the web W in the conveying mechanism without the risk of mechanical or tensile stress due to the printing processes at the different cylinders.
  • compositions in liquid form may be dried in an optional stage M5 of the method M. Said drying stage may alternatively be carried out after each of the printing processes M2 and M3.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Printing Methods (AREA)
  • Inking, Control Or Cleaning Of Printing Machines (AREA)
  • Rotary Presses (AREA)
  • Handling Of Sheets (AREA)

Abstract

A processing system for a web includes a conveying mechanism configured to feed a continuous web of material along a conveying path in the processing system, a first printing cylinder having a first diameter and a first printing pattern, the first printing cylinder being arranged adjacent to the conveying path and configured to print a first image pattern on at least one surface of the continuous web, at least one second printing cylinder having a second diameter different from the first diameter and a second printing pattern, the second printing cylinder being arranged adjacent to the conveying path and configured to print a second image pattern on top of the first image pattern on the continuous web, and a system controller coupled to the conveying mechanism and configured to control the conveying mechanism according to at least one registration procedures, wherein the system controller is configured to selectively disable at least one of the registration procedures when printing the first and second image patterns to print a final random image pattern on the at least one surface of the continuous web.

Description

Web processing system and method for processing a web
Field of the invention
The invention pertains to a web processing system and a method for processing a web, particularly for printing random patterns or layouts onto a continuous web of material.
Background of the invention
Articles of value are usually protected by some sort of authenticity measures that are put into place by the manufacturer to prevent the forgery of such an article. For example, cigarette boxes may be tagged in way that allows to track its origin and to confirm its authenticity. Conventionally employed techniques involve methods of recording identification codes or the like on cardboard or paper using sophisticated printing techniques to tag the desired articles of value with a seal of genuineness. Those printing techniques are hard to reproduce for imitators or plagiarists since the techniques either involve specific knowledge about the manufacturing process or the use of hard to obtain materials.
The document EP 1 125 758 Al discloses a system for tagging sheets of paper with a random pattern, the system using a series of printing rollers that may apply phase shifted random patterns to one or both sides of the sheet, Summary of the invention
One idea of the present invention is to provide a web processing system that is able to generate a patterned image on the web which patterned image is truly random or at least pseudo-random in nature,
A first aspect of the present invention therefore relates to a processing system for a web, comprising a conveying mechanism configured to feed a continuous web of material along a conveying path in the processing system; a first printing cylinder having a first diameter and a first printing pattern, the first printing cylinder being arranged adjacent to the conveying path and configured to print a first image pattern on at least one surface of the continuous web; at least one second printing cylinder having a second diameter different from the first diameter and a second printing pattern, the second printing cylinder being arranged adjacent to the conveying path and configured to print a second image pattern on top of the first image pattern on the continuous web; and a system controller coupled to the conveying mechanism and configured to control the conveying mechanism according to at least one registration procedures, wherein the system controller is configured to selectively disable at least one of the registration procedures when printing the first and second image patterns to print a final random image pattern on the at least one surface of the continuous web.
A second aspect of the present invention relates to a method for processing a web, the method comprising conveying a continuous web of material along a conveying path in a processing system by a conveying mechanism; printing a first image pattern on at least one surface of the continuous web using a first printing cylinder having a first diameter and a first printing pattern; printing a second image pattern on top of the first image pattern on the continuous web using at least one second printing cylinder having a second diameter different from the first diameter and a second printing pattern; and selectively disabling at least one registration procedure for the conveying mechanism when printing the first and second image patterns to print a final random image pattern on the at least one surface of the continuous web. According to a third aspect of the invention, a web of material comprises a random pattern printed on a surface thereof, wherein the random pattern is obtained according to the method of the first aspect of the invention.
The dependent claims provide additional technical features of advantageous embodiments and further improvements of the invention.
According to an embodiment of the processing system, the first printing pattern and/or the second printing pattern may be different. According to another embodiment of the processing system, the registration procedures may comprise one or more of control of web conveying speed, control of lateral web alignment, control of conveying path length between the printing cylinders and control of web tension.
According to another embodiment of the processing system, the system controller may further be coupled to the first printing cylinder and the at least one second printing cylinder and configured to drive the first printing cylinder and the at least one second printing cylinder at different rotational speed.
According to another embodiment of the processing system, the system controller may further be configured to drive the first printing cylinder and the at least one printing cylinder at the same tangential speed.
According to an embodiment of the method, the first image pattern and/or the second image pattern may comprise random image patterns.
According to another embodiment of the method, the first printing pattern and the second printing pattern may comprise different patterns.
According to another embodiment of the method, the registration procedures may comprise one or more of control of web conveying speed, control of lateral web alignment, control of conveying path length between the printing cylinders and control of web tension.
According to another embodiment of the method, the continuous web material may comprise one of cardboard, paper, cellulose, textile fabric, plastic, metal or a laminate combination thereof.
According to another embodiment of the method, the first printing cylinder and the at least one second printing cylinder may be driven at different rotational speed.
According to another embodiment of the method, the first printing cylinder and the at least one second printing cylinder may be driven at the same tangential speed.
According to another embodiment of the method, printing the first and second printing pattern may comprise transferring compositions comprising at least one of an ink, a varnish and a wax onto the at least one surface of the web.
The web according to the third aspect of the invention may in an embodiment include separation means adapted to allow separation of at least one sheet from the web, the at least one sheet comprising a portion of the printed random pattern. The separation means may comprise score lines, perforation lines or die cuts formed in the material of the web. The web material according to the third aspect of the invention may in an embodiment comprise one of cardboard, paper, cellulose, textile fabric, plastic, metal or a laminate combination thereof. A package comprising at least one part thereof made from a web may be manufactured using a web of material according to the third aspect of the invention.
The invention will be explained in greater detail with reference to exemplary embodiments depicted in the drawings as appended.
Brief description of the drawings
The accompanying drawings are included to provide a further understanding of present invention and are incorporated in and constitute a part of this specification,
The drawings illustrate the embodiments of the present invention and together with the description serve to explain the principles of the invention. Other embodiments of the present invention and many of the intended advantages of the present invention will be readily appreciated as they become better understood by reference to the following detailed description. The elements of the drawings are not necessarily to scale relative to each other. Like reference numerals designate corresponding similar parts.
Fig. 1 shows a schematical illustration of a processing system in isometric view according to one embodiment of the invention.
Fig. 2 schematically illustrates a portion of a base web according to a further embodiment of the invention.
Fig. 3 depicts a functional block diagram of stages in a method for processing a web according to yet another embodiment of the invention.
Detailed description of the embodiments
Although specific embodiments have been illustrated and described herein, it will be appreciated by those of ordinary skill in the art that a variety of alternate and/or equivalent implementations may be substituted for the specific embodiments shown and described without departing from the scope and spirit of the present invention. Generally, this application is intended to cover any adaptations or variations of the specific embodiments discussed herein. In particular, specific features, characteristics and properties of different embodiments as discussed hereinbelow may be combined, if not explicitly indicated otherwise.
Generally, this application is intended to cover any adaptations or variations of the specific embodiments discussed herein. In the present invention, reference is made to printing machines and printing systems. Such printing apparatuses are generally intended to comprise any combination or structural arrangement of units, modules and registers that are able to convey a web to be processed along a conveying path within the apparatus. Moreover, the printing apparatuses may comprise any components that are adapted to imprint, stamp or presswork patterns, images, text or coloured areas onto one or both sides of the web being processed. The printing apparatus may comprise one or more of laser beam devices, developing devices, transfer devices, fixation devices, cutting devices, folding devices and similar conventionally known components in gravure and offset printing.
Fig. 1 schematically illustrates a processing system 100. The processing system 100 may particularly be configured to process and produce printed webs Wp of material, the web Wp comprising material such as cardboard, paper, cellulose, textile fabric, plastic, metal or a laminate combination thereof. The processing system 100 generally comprises a plurality of processing stages 12 that are equipped with rollers or feed units, generally denoted with the reference sign 10 in Fig. 1. The rollers 10 form part of a conveying mechanism 11 that is configured to feed a continuous web W of material along a conveying path in the processing system 100.
Fig. 2 illustrates a functional view of a processing system for processing webs W and may be seen as conceptual depiction of the processing system 100 in Fig. 1. The web W may be input to the processing system at a system input 8, conveyed through the various processing stages 12 and output as printed web Wp at a system output 9, Among other not specifically indicated processing units and modules, the processing system 100 comprises a first printing cylinder 1 having a first diameter dl and a first printing pattern formed thereon. The first printing cylinder 1 is arranged adjacent to the conveying path and configured to print a first image pattern, i.e. a printed image of the printing pattern of the first printing cylinder, on at least one surface of the continuous web W. In Fig. 1 and 2 the first printing cylinder 1 is configured to print the first image pattern on the bottom surface of the web W running between the first printing cylinder 1 and a corresponding pressure roller 4.
The processing system 100 further comprises at least one second printing cylinder 2 having a second diameter d2 different from the first diameter dl and a second printing pattern formed thereon. For example, the second diameter d2 may be larger than the first diameter dl. The second printing cylinder 2 is arranged in series with the first printing cylinder 1 and may be arranged downstream of the first printing cylinder 1 in the conveying path of the web W. The second printing cylinder 2 is likewise arranged adjacent to the conveying path and is configured to print a second image pattern, i.e. a printed image of the second printing pattern of the second printing cylinder, on top of the first image pattern on the continuous web W. To that end, the second printing cylinder 2 may be configured to print the second image pattern on the bottom surface of the web W running between the second printing cylinder 2 and a corresponding pressure roller 5..
As shown in Fig, 1, there may be a third printing cylinder 3 downstream of the second printing cylinder 2, the third printing cylinder 3 having a diameter different from the diameter of the first and/or second printing cylinder 1 and 2, and preferably a third printing pattern formed thereon. A corresponding pressure roller 6 may be provided in order to have the third printing cylinder 3 print a third image pattern, i.e. a printed image of the third printing pattern of the third printing cylinder, on a surface of the web W running between the third printing cylinder 3 and the pressure roller 6. Generally, the number of printing cylinders 1, 2 and 3 is not limited to two or three, but may instead be any desired number greater than two.
The first printing pattern and/or the second printing pattern may be printed on the web W as image patterns or layouts, for example as ornamental designs or lines, dots or geometrical shapes in various colours and/or line thickness. The first printing pattern and the second printing pattern may for example be different patterns providing a final image pattern made of an overlapping of the first and second image patterns on the web W, i.e. the different printing cylinders 1, 2 and 3 print different image patterns on top of each other. The printing cylinders 1, 2 and 3 may be configured to transfer compositions in liquid form onto the at least one surface of the web W, such as ink, varnish or wax. Once transferred to the surface of the web W, the processing system 100 may comprise a drying module downstream of each of the printing cylinders 1, 2 and 3 that is configured to dry the compositions in liquid form printed on the web W. The processing system 100 further comprises a system controller 7 which is coupled to the conveying mechanism IX and the printing cylinders 1, 2 and 3. The system controller 7 is on one hand responsible for control of the printing cylinders 1, 2 and 3. For example, the system controller 7 may be configured to drive the printing cylinders 1, 2 and 3 at different rotational speed. Depending on the diameters dl and d2 of the printing cylinders 1, 2 and 3 the system controller 7 may adapt the rotational speed of each of the printing cylinders 1, 2 and 3 in such a way that the printing cylinders 1, 2 and 3 are driven at the same tangential speed. This way, the speed of the web W passing by the printing cylinders 1, 2 and 3 will remain constant throughout the whole printing process.
On the other hand, the system controller 7 is configured to control the conveying mechanism 11 according to at least one registration procedure. Such registrations procedures may for example include control of web conveying speed, control of lateral web alignment, control of conveying path length between the printing cylinders and control of web tension. By selectively disabling at least one of the registration procedures when printing the first and second printing patterns, the system controller 7 is able to provide a certain randomness in the printing parameters of the processing system 100, thereby introducing a degree of ^reproducibility to the printed patterns. In particular, owing to disabling of one or more of the registration procedures each of the first second image patterns has a certain degree of randomness due to the granted ability for the web W to move out of registry over the first and/or second and/or third printing rollers. Consequently, each of the first, second and third image patterns are random or at least pseudo-random and the final image pattern obtained at the outlet 9 of the processing system 100, which is made of a combination of the first, second and third image patterns is also random or at least pseudo-random. The printed web Wp is therefore printed with a unique final image pattern, which is therefore very hard to reproduce,
The processing system 100 may be used to print continuous webs Wp of material that include a truly or at least pseudo-random pattern printed on a surface thereof. The web Wp may for example comprise separation means, such as score lines, perforation lines or die cuts formed in the material of the web Wp, that are adapted to allow separation of at least one sheet from the web Wp. Each separated sheet then comprises a portion of the printed random pattern. Such sheets may subsequently be used in manufacturing or tagging a package, for example a cigarette box.
Fig. 3 schematically illustrates a block diagram of a method M for processing a continuous web of material, such as the web W of Figs. 1 and 2. The method M may particularly be implemented with a web processing system, such as the processing system 100 as illustrated in and explained in conjunction with Figs, 1 and 2,
In a first stage, the method M may comprise at Ml the process of conveying a continuous web W of material along a conveying path in a processing system 100 by a conveying mechanism 11. The web W may for example be made from a material comprising one of cardboard, paper, cellulose, textile fabric, plastic, metal or a laminate combination thereof. The conveying mechanism 11 may for example comprise a number of rollers and web feed modules, such as rollers 10. The conveying mechanism may in particular be distributed over a series of processing stages 12 of the processing system 100.
In a second stage M2, a first image pattern is printed on at least one surface of the continuous web W, for example the upper surface, using a first printing cylinder 1 having a first diameter dl and a first printing pattern. Then, in a third stage fvB, a second image pattern may be printed on top of the first image pattern on the continuous web W using at least one second printing cylinder 1 having a second diameter dl different from the first diameter dl and a second printing pattern, preferably different from the first printing pattern. The printing processes of M2 and 3 may for example comprise transferring compositions in liquid form, such as ink, varnish or wax, onto the at least one surface of the web W.
In a fourth stage M4, while the first and second image patterns are printed on the web W by the printing cylinders 1, 2 and 3, at least one registration procedure for the conveying mechanism 11 in the processing system 100 may be selectively disabled. The processing system 100 may be under control of a system controller 7 that controls various registration procedures in the system such as the control of web conveying speed, the control of lateral web alignment, the control of conveying path length between the printing cylinders 1, 2 and 3, and the control of web tension. Due to disabling at least one registration procedure for the conveying mechanism 11 the first and second printing pattern of the printing cylinders may each provide random image patterns onto the web W. In order to create as much randomness in the resulting overall final image pattern on the web W, the first printing pattern and the second printing pattern may each provide different image patterns. To achieve an independence of the image patterns, the first printing cylinder 1 and the at least one printing cylinder 2, 3 may be driven at different rotational speed, but at the same tangential speed. This ensures that the sequence of the first and second image patterns is randomly shifted with respect to each other. On the other hand, having the first and second printing cylinders 1, 2 and 3 run at the same tangential speed will guarantee a constant web speed of the web W in the conveying mechanism without the risk of mechanical or tensile stress due to the printing processes at the different cylinders.
If the image patterns have been transferred from the printing cylinders to the web W as compositions in liquid form, those compositions may be dried in an optional stage M5 of the method M. Said drying stage may alternatively be carried out after each of the printing processes M2 and M3.
Particular features of an embodiment of the invention may have been disclosed with respect to only one of several implementations, however, said feature may be combined with one or more other features of the other implementations as may be desired and advantageous for any given or particular application. Furthermore, to the extent that the terms "include", "have", "with", or other variants thereof are used in either the detailed description or the claims, such terms are intended to be inclusive in a manner similar to the term "comprise". The terms "coupled" and "connected", along with derivatives may have been used. It should be understood that these terms may have been used to indicate that two components work together or interact with each other, irrespective of whether they are in direct physical or electrical contact or not. Additionally, any terminology used in the foregoing description related to the spatial arrangement of features, elements or components of the embodiments depicted in the drawings, such as "top", "bottom", "left", "right", "lower", "upper" and similar terms, is used solely for purposes of an easier understanding and is not intended to limit the invention in any way.
List of Reference Signs i Printing cylinder
2 Printing cylinder
3 Printing cylinder
4 Pressure roller
5 Pressure roller
6 Pressure roller
7 System controller
8 Web inlet
9 Web outlet
10 Conveying roller
11 Conveying mechanism
12 Processing stage
dl Cylinder diameter
d2 Cylinder diameter
M Method
Ml Method step
M2 Method step
M3 Method step
M4 Method step
MS Method step
W Web
Wp Printed web

Claims

Claims
1. Processing system (100) for a web (W), comprising:
a conveying mechanism (11) configured to feed a continuous web (W) of material along a conveying path in the processing system (100);
a first printing cylinder (1) having a first diameter (dl) and a first printing pattern, the first printing cylinder (1) being arranged adjacent to the conveying path and configured to print a first image pattern on at least one surface of the continuous web (W);
at least one second printing cylinder (2; 3) having a second diameter (d2) different from the first diameter (dl) and a second printing pattern, the second printing cylinder (2, 3) being arranged adjacent to the conveying path and configured to print a second image pattern on top of the first image pattern on the continuous web (W); and
a system controller (7) coupled to the conveying mechanism (11) and configured to control the conveying mechanism (11) according to at least one registration procedure,
wherein the system controller (7) is configured to selectively disable at least one of the registration procedures when printing the first and second image patterns to print a final random image pattern on the at least one surface of the continuous web (W).
2. Processing system (100) according to claim 1, wherein the first printing pattern and/or the second printing pattern are different,
3. Processing system (100) according to one of the claims 1 or 2, wherein the registration procedures comprise one or more of control of web conveying speed, control of lateral web alignment, control of conveying path length between the printing cylinders (1; 2; 3) and control of web tension.
4. Processing system (100) according to one of the claims 1 to 3, wherein the system controller (7) is further coupled to the first printing cylinder (1) and the at least one second printing cylinder (2; 3) and configured to drive the first printing cylinder (1) and the at least one second printing cylinder (2; 3) at different rotational speed.
5. Processing system (100) according to claim 4, wherein the system controller (7) is further configured to drive the first printing cylinder (1) and the at least one second printing cylinder (2; 3) at the same tangential speed,
6. Method (M) for processing a web (W), the method (M) comprising:
conveying (Ml) a continuous web (W) of material along a conveying path in a processing system (100) by a conveying mechanism (11);
printing (M2) a first image pattern on at least one surface of the continuous web (W) using a first printing cylinder (1) having a first diameter (dl) and a first printing pattern;
printing ( 3) a second image pattern on top of the first image pattern on the continuous web (W) using at least one second printing cylinder (2, 3) having a second diameter (d2) different from the first diameter (dl) and a second printing pattern; and
selectively disabling ( 4) at least one registration procedure for the conveying mechanism (11) when printing the first and second image patterns to print a final random image pattern on the at least one surface of the continuous web (W).
7. Method (M) according to claim 6, wherein the first image pattern and/or the second image pattern comprise random image patterns,
8. Method ( ) according to one of the claims 6 and 7, wherein the first printing pattern and the second printing pattern comprise different patterns.
9. Method (M) according to one of the claims 6 to 8, wherein the registration procedures comprise one or more of control of web conveying speed, control of lateral web alignment, control of conveying path length between the printing cylinders (1; 2; 3) and control of web tension.
10. Method (M) according to one of the claims 6 to 9, wherein the continuous web (W) material comprises one of cardboard, paper, cellulose, textile fabric, plastic, metal or a laminate combination thereof.
11. Method (M) according to one of the claims 6 to 10, wherein, the first printing cylinder (1) and the at least one second printing cylinder (2; 3) are driven at different rotational speed.
12, Method (M) according to claim 11, wherein the first printing cylinder (1) and the at least one second printing cylinder (2; 3) are driven at the same tangential speed,
13. Method ( ) according to one of the claims 6 to 12, wherein printing (M2; M3) the first and second printing pattern comprises transferring compositions onto the at least one surface of the web (W) comprising at least one of an ink, a varnish and a wax onto the at least one surface of the web (W).
14. A. web (Wp) of material, comprising a random pattern printed on a surface thereof, wherein the random pattern is obtained according to the method (M) of one of the claims 6 to 13.
15. Package comprising at least one part thereof made from a web (Wp) according to claim 14.
EP15784348.3A 2014-11-11 2015-10-21 Web processing system and method for processing a web Active EP3218189B1 (en)

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PCT/EP2015/074305 WO2016074890A1 (en) 2014-11-11 2015-10-21 Web processing system and method for processing a web

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KR (1) KR102323298B1 (en)
CA (1) CA2967089A1 (en)
EA (1) EA033352B1 (en)
PH (1) PH12017500855B1 (en)
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JPS57212090A (en) * 1981-06-25 1982-12-27 Toppan Printing Co Ltd Printing method
JPS5874388A (en) * 1981-10-29 1983-05-04 Toppan Printing Co Ltd Production of relief printing type decorative sheet
DE3216485C1 (en) * 1982-04-30 1983-04-21 Billett-Automation Dipl.-Ing. Klaus Schwarz oHG, 8164 Hausham Method and device for printing portions of documents
JPH07323655A (en) * 1994-05-31 1995-12-12 Toppan Printing Co Ltd Random pattern printing method
US6321648B1 (en) * 2000-02-14 2001-11-27 Xerox Corporation Systems and methods for unforgeable document tagging
GB0129369D0 (en) * 2001-12-07 2002-01-30 Filtrona United Kingdom Ltd Method and apparatus for marking articles
TW530757U (en) * 2002-02-08 2003-05-01 Kun-Ti Li Cylinder printing machine
US20070202348A1 (en) * 2003-10-09 2007-08-30 Klemens Bruckerhoff Method For The Production Of A Stamping Tool To Stamp Safety Elements In Surfaces Of Carrier Materials, As Well As Carrier Material With At Least One Safety Element
JP2006076036A (en) * 2004-09-08 2006-03-23 Dainippon Printing Co Ltd Elevating speed register fluctuation suppressing method and apparatus, and gravure printing machine
WO2007116376A2 (en) * 2006-04-10 2007-10-18 Cc1 Inc. Method and apparatus for re-registering a mechanical drive press
CN102336078A (en) * 2010-07-14 2012-02-01 台昌彩艺工业股份有限公司 Intaglio printing method for matching of different circumferences of printing plate wheels for indoor decoration materials

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SG11201703752TA (en) 2017-06-29
CA2967089A1 (en) 2016-05-19
EA033352B1 (en) 2019-09-30
PL3218189T3 (en) 2018-12-31
WO2016074890A1 (en) 2016-05-19
EP3218189B1 (en) 2018-07-18
PH12017500855A1 (en) 2017-11-06
JP2017533848A (en) 2017-11-16
EA201791025A1 (en) 2017-10-31
JP6592516B2 (en) 2019-10-16
TWI657935B (en) 2019-05-01
KR102323298B1 (en) 2021-11-11
PH12017500855B1 (en) 2017-11-06
KR20170084116A (en) 2017-07-19

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