US20100183822A1 - Surface marked articles, related methods and systems - Google Patents

Surface marked articles, related methods and systems Download PDF

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Publication number
US20100183822A1
US20100183822A1 US12/689,020 US68902010A US2010183822A1 US 20100183822 A1 US20100183822 A1 US 20100183822A1 US 68902010 A US68902010 A US 68902010A US 2010183822 A1 US2010183822 A1 US 2010183822A1
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United States
Prior art keywords
laser
ink
graphic design
article
design element
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Abandoned
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US12/689,020
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English (en)
Inventor
Mark Ruggie
Henry Coghlan
Hallie Heuser
Chase Carter
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Masonite Corp
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Individual
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Priority to US12/689,020 priority Critical patent/US20100183822A1/en
Assigned to ECHELON LASER SYSTEMS, LP reassignment ECHELON LASER SYSTEMS, LP ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: CARTER, CHASE, COGHLAN, HENRY, HEUSER, HALLIE, RUGGIE, MARK
Publication of US20100183822A1 publication Critical patent/US20100183822A1/en
Assigned to MASONITE CORPORATION reassignment MASONITE CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: ECHELON LASER SYSTEMS, LP
Abandoned legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
    • B41M5/24—Ablative recording, e.g. by burning marks; Spark recording
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J3/00—Typewriters or selective printing or marking mechanisms characterised by the purpose for which they are constructed
    • B41J3/407—Typewriters or selective printing or marking mechanisms characterised by the purpose for which they are constructed for marking on special material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J3/00—Typewriters or selective printing or marking mechanisms characterised by the purpose for which they are constructed
    • B41J3/407—Typewriters or selective printing or marking mechanisms characterised by the purpose for which they are constructed for marking on special material
    • B41J3/4073—Printing on three-dimensional objects not being in sheet or web form, e.g. spherical or cubic objects
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J3/00—Typewriters or selective printing or marking mechanisms characterised by the purpose for which they are constructed
    • B41J3/54—Typewriters or selective printing or marking mechanisms characterised by the purpose for which they are constructed with two or more sets of type or printing elements
    • B41J3/546—Combination of different types, e.g. using a thermal transfer head and an inkjet print head
    • 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
    • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
    • B41M5/0041—Digital printing on surfaces other than ordinary paper
    • B41M5/0047—Digital printing on surfaces other than ordinary paper by ink-jet printing

Definitions

  • the present invention relates to articles, especially doors and door skins, surface marked by laser marking and ink-jet printing to provide high quality decorative products.
  • the present invention further relates to methods and systems for making such articles.
  • ком ⁇ онентs such as medium to high density fiberboard and particleboard, as well as other “synthetic” materials such as laminates, veneers, and reinforced polyester sheet molding compound (SMC), to name a few.
  • SMC polyester sheet molding compound
  • Such products find various applications, including interior uses, such as for interior passageway doors and door skins, drywall, countertops, kitchen cabinets, wainscoting, flooring, wall panels, ceiling tiles, interior trim components, and exterior uses, such as for entry doors, decking, siding, trim, fencing, and window frames.
  • Ink-jet printed surfaces lack a textural feel inherent in many natural materials, and vital to their appearance. Additionally, cylinder printing and foil overlay techniques suffer from various problems when they are utilized on non-uniform surfaces. Non-uniform article surfaces may have particular features, such as channels or recesses, which lie below a principal planar surface of the article. Cylinder printing techniques may fail to contact such surface features below the principal planar surface. Foil overlays, on the other hand, may completely hide or conceal these features. Other surface decorative processes such as sandblasting and veneering have their drawbacks as well, such as high cost.
  • Laser marking techniques seemingly provide an attractive alternative to the above conventional processes for decorating building products.
  • laser marking or laser scribing, is a non-contact energetic process relying on heat generated by a laser beam incident on the surface of a work piece to alter the work piece surface.
  • the laser output power, laser beam focal point, and laser beam speed i.e. traversing velocity
  • lasers alone remain insufficient for generating realistic simulations of natural surfaces such as wood, stone, or other natural materials.
  • laser-treated surfaces lack certain pattern elements of authentic natural materials, such as wood graining in the case of wood reproductions, or mosaics of interlocking mineral grains in the case of natural stone reproductions. Distinguishing between an authentic natural material and a synthetic material such as medium-density fiberboard (MDF) or particleboard treated with a conventional laser remains easy, even from a distance.
  • MDF medium-density fiberboard
  • a first aspect of the invention provides a method of surface marking an article, such as a door, featuring registering a first graphic design element with a second graphic design element, laser marking the first graphic design element in a surface of the article, and ink-jet printing a second graphic design element on the surface of the article, the first and second graphic design elements being registered with one another to provide a high quality overall graphic design that simulates visually and texturally a natural material.
  • a second aspect of the invention relates to an article featuring a first graphic design element laser-marked on a surface of the article, and a second graphic design element ink-jet printed in a predetermined orientation or association with the first graphic design element on the article surface to provide a high quality overall graphic design that simulates visually and texturally a natural material.
  • a third aspect of the invention relates to a system for surface marking an article.
  • the system includes a laser marking apparatus and an ink jet printing apparatus for printing first and second graphic design elements, respectively, in a predetermined orientation or association relative to one another to provide a high quality overall graphic design that simulates visually and texturally a natural material.
  • FIG. 1 is a flowchart of a method for marking a surface of an article according to an embodiment of the invention
  • FIG. 2 is a flowchart of a method for marking a surface of an article according to another embodiment of the invention.
  • FIG. 3 is an elevational view of a door structure article according to an embodiment of the invention.
  • FIG. 4 is an enlarged fragmented view of the door structure article of FIG. 3 according to an embodiment of the invention.
  • FIG. 5 is a cross-sectional view taken along sectional line V-V of FIG. 3 ;
  • FIG. 6 is a flowchart of a method for marking a surface of an article according to another embodiment of the invention.
  • FIG. 7 is a schematic view of a system for marking a surface of an article according to an embodiment of the invention.
  • FIG. 8 is a schematic view of a laser controller and laser of the system of FIG. 7 according to an embodiment of the invention.
  • FIG. 9 is a schematic view of an ink jet printing apparatus of the system of FIG. 7 according to an embodiment of the invention.
  • FIG. 10 is a schematic view of a printing station of the printing apparatus of FIG. 9 according to an embodiment of the invention.
  • FIG. 11 is a schematic view of the ink-jet printer of FIG. 9 according to an embodiment of the invention.
  • a method in which a first graphic design element is laser marked on a surface of an article and a second graphic design element is ink-jet printed on the surface of the article.
  • the first graphic design element is registered with the second graphic design element so that the overall graphic design may be a cooperative interaction between the laser-marked graphic design element and the ink-jet printed graphic design element.
  • methods of the invention may produce a coordinated appearance of the final graphic design.
  • the predetermined orientation or association relative to the first and second graphic design elements may involve their registration, superimposition or juxtaposition on the article surface using, for example, predetermined coordinates.
  • the laser-marked and ink-jet printed graphic design elements produce a synergistic effect manifested as a high quality simulation of natural materials that could not be attained by either laser marking or ink jetprinting alone.
  • the first graphic design element and the second graphic design element may also produce a textural contrast as discussed below.
  • FIG. 1 is a flowchart of a method for marking a surface of an article according to an embodiment of the invention.
  • Articles that may be subject to marking according to the present invention include synthetic building components intended to replicate natural wood.
  • Exterior entry doors and interior passage doors, decks and deck components, siding, paneling, furniture components, etc. whether of solid construction or so-called hollow core doors constructed from a peripheral door frame with opposite door skins.
  • Peripheral door frames include stiles and rails which define the sides and top and bottom of the door.
  • a pair of door skins have interior surfaces secured to opposite sides of the peripheral door frame via bonding, mechanical fasteners, etc., and opposite exterior surfaces.
  • hollow core doors may include additional support members and/or core materials (e.g., foam) disposed between the skins.
  • building components that may be subject to the exemplary methods and systems described herein include furniture and cabinet doors, closet and bifold doors, door trim, window frames, furniture elements, cabinetry, picture frames, tables, molded wall paneling, wainscot, decking, wall panels, siding, railings, window trim, architectural trim, flooring, etc.
  • exemplary embodiments below are described in relation to building components, in particular door structures. It should be understood that the methods and systems described herein may be used for marking other building component and articles other than building components.
  • Engineered composite materials generally contain cellulosic fibers or other particles, often broken down in a defibrator, and a resin and optionally wax, which are compressed at high temperatures and pressures.
  • the cellulosic fibers/particles often constitute more than 90 weight percent of the material.
  • the cellulosic component typically but not necessarily is wood fiber.
  • the binding resin is typically a thermoset.
  • Examples of other materials that may be treated using the systems and methods embodied herein include fiberglass-reinforced sheet molding compound (SMC) polyesters, paints and basecoats on substrates, polymer sheets, veneers, papers, and natural materials, e.g. wood.
  • SMC sheet molding compound
  • a first graphic design element is registered with a second graphic design element 102 in a first step.
  • the first graphic design element may be associated with a first graphic design element file
  • the second graphic design element may be associated with a second graphic design element file.
  • the first graphic design element file and the second graphic design element file may be systematically matched for visual impression (i.e. aesthetics) and tactile impression (i.e. touch) to produce one or more unified graphic design files.
  • Graphic designs referred to herein may encompass decorative and artistic designs.
  • the graphic designs may comprise simple geometric shapes and/or highly complex artistic representations.
  • the graphic design may include repeating patterns such as a diamond, houndstooth or chevron pattern, or non-repeating patterns, such as floral designs.
  • Graphic designs which simulate the appearance of wood grain patterns and routed or mill-worked features are especially applicable.
  • exemplary embodiments of the invention permit the printing and marking of advanced, highly aesthetic graphic designs to allow the manufacture of premium products, including those not now available in the marketplace, in an economical manner for high output industrial production.
  • a laser marking printer i.e. a laser scriber
  • a laser controller may laser-mark one or more graphic design elements onto one or more portions of the surface of the article.
  • Each graphic design element may be associated with a graphic design element file.
  • a laser beam causes a visually perceptible change to the article surface, typically by causing removal, ablation, or etching of a coated or uncoated article surface.
  • the visually perceptible change is typically in the form of a recess of a depth that extends partly through the article or article coating, without cutting entirely through the article. (This is not to exempt the use of the laser for separate cutting operations as well.)
  • the recess may be configured as a channel, groove or trench, cavity, or other depression.
  • Recesses configured as channels/trenches of elongate length may be arranged on the surface of the article to create an appearance that the article (e.g., door structure) has been routed, mill-worked, or assembled together from multiple elements, i.e., as opposed to a monolithic structure.
  • the laser beam can be configured to create textural simulations that mimic the touch or feel of natural materials and/or traditional processing techniques.
  • the laser beam may be controlled to impart to the recessed area a relatively rough textural feel that closely mimics the texture or feel of a non-synthetic processed object such as routed or millwork wood which has not been significantly sanded.
  • a non-synthetic processed object such as routed or millwork wood which has not been significantly sanded.
  • the planar surface of the article is relatively smooth prior to laser-marking, this smoothness is maintained at areas of the article surface that are not laser-marked, whereas those surface areas that are laser-marked develop a greater coarseness due to the laser marking.
  • the surface topography of the coarse areas may be characterized visually (from a naked eye perspective) as irregular and uneven in many cases.
  • the laser marking particularly when applied to MDF, forms a surface that appears to expose the ends of individual wood fibers. The contrast in texture between adjacent surface areas contributes to the highly desirable visual impression of
  • the laser marking may be done to the substrate of the article, or to any layer of an applied finish.
  • the laser marking may partially or completely penetrate any one of the layers or the substrate.
  • the depth of the laser marking may vary from a shallow marking on the surface to a complete penetration of the article substrate.
  • the laser marking may penetrate into the ground coat, but not so far as to enter the substrate.
  • the laser marking penetrates the topcoat but not into the base coat.
  • the laser marking may penetrate to a combination of these and other depths.
  • the second graphic design element is ink-jet printed on the surface of the article.
  • An ink jet printer comprising one or more ink-jet print heads and an ink-jet printer controller, may ink-jet print the second graphic design element onto one or more portions of the surface of the article.
  • the resin and wood fibers of the MDF are ablated.
  • the ablation creates a depth, and simultaneously changes the color of the MDF to a brown tone.
  • the ablated area is ink-jet printed, the combination of the laser marking and ink-jet printing achieves a synergistic effect with a superior visual appearance to using either technique alone.
  • the areas which are laser marked and coated with ink reflect light differently than the areas which are ink coated but non-laser marked. This contrast adds to the perceived depth of the laser marked areas.
  • the ink may be applied to exposed fibers of the MDF, which provide an enhanced visual and tactile effect previously unobtainable.
  • the laser marking and ink-jet printing process is not limited by substrate, and may include articles comprise of MDF/hardboard, SMC fiberglass polyesters, paints, base coats on substrates, papers, polymer sheets, veneers, and natural woods.
  • FIG. 2 is a flowchart of a method for marking a surface of an article according to another embodiment of the invention. As shown in FIG. 2 , the second graphic design element is ink-jet printed on the surface of the article 206 before the first graphic design element is laser marked on the surface of the article 208 .
  • the laser marking and ink-jet printing of the graphic design elements may be conducted in multiple stages.
  • the descriptors “first” and “second” graphic designs are not intended to indicate the sequence in which the graphic designs are created or applied to the article surface.
  • the entire surface of the article, or alternatively some portion of the surface may be laser marked.
  • the entire surface of the article, or some portion of the surface of the article may receive ink-jet printing.
  • the surface of the article is prepared at 204 .
  • a base coating is applied to all or part of the surface of the article.
  • the base coating readies the surface of the article for ink-jet printing.
  • FIG. 3 is an elevational view of a door structure article according to an embodiment of the invention.
  • FIG. 3 comprises a door structure 300 .
  • a plurality of channels 308 provide the appearance that the door structure 300 is constructed from a plurality of vertical planks 304 a , 304 b and a plurality of horizontal planks 306 a , 306 b .
  • the vertical planks 304 and the horizontal planks 306 collectively define a major planar portion 302 .
  • the channels 308 are configured in rectangular or square (viewed in plan) contour to define the outlines of a plurality of interior panels 310 .
  • the complete exterior article surface area surrounding or otherwise peripheral to the interior panels 310 is referred to as the major planar portion 302 .
  • the exterior surfaces of the major planar portion 302 and the interior panels 310 may be coplanar with one another.
  • the major planar portion 302 and interior panels 310 may possess smooth exterior surfaces, whereas the areas corresponding to the channels 310 may possess a coarser exterior surface to replicate the texture of routed or millwork wood.
  • the door structure 300 of FIG. 3 includes ten (10) of the interior panels 310 .
  • the ten interior panels 310 of the illustrated embodiment are square and identical to one another.
  • a surface article may comprise one or more interior panels 310 .
  • the interior panels 310 may possess other shapes, and may be identical or different in shape from one another.
  • FIG. 4 is an enlarged fragmented view of the door structure article of FIG. 3 .
  • the channels 308 may be laser etched in close proximity and generally concentric to one another to provide the peripheries of the interior panels 310 with the appearance of wood that has been expertly routed or subject to millwork.
  • a variety of other graphics, including intricate and ornate design patterns may be laser marked in various articles such as building products.
  • the interior panel 308 of door structure 300 includes a highly complex or ornate design such as a twisted-rope design 312 laser etched between the generally concentric channels 308 .
  • other complex designs may be laser marked onto the surface of the article. For example, for wood simulations, small depressions in the article surface may be created through laser marking. These small depressions may mimic the look and feel of wood ticks found in natural wood, such as the ticks of oak or mahogany.
  • Laser marking may be used to create patterns other than wood or millwork patterns.
  • the recesses laser marked in an article surface may be arranged in a grid pattern to simulate the edges of ceramic tiles or bricks of a wall or floor structure, with the grid pattern of channels having a rough laser marked surface that replicates the appearance of grout or mortar.
  • the texture created by the laser in such channels may be controlled to provide a visual and tactile impression of coarseness similar to that of mortar or grout, whereas non-laser marked areas of the product surface remain smooth to closely simulate the appearance and feel of a ceramic.
  • the recesses may be laser marked along non-linear paths to simulate the edges of natural uncut stone, for example.
  • a complementary second graphic design element is ink-jet printed in registry with the laser marked first graphic design element so as to create an enhanced or synergistic overall graphic effect. Distinct graphics may be applied to the laser marked areas and non-laser marked areas to increase contrast. In the case of a wood simulation, for example, lighter tones and more visible grain patterns may be ink-jet printed on the smooth (i.e. non-laser marked) areas of the article surface than on the coarse (i.e. laser marked) areas.
  • the intricate detail of complex designs that might be cost prohibitive or unfeasible to laser mark can be ink-jet printed on the article surface as a second graphic design element registered with a laser marked first graphic design element.
  • Wood grain patterns and wood tones of oak, walnut, cedar, mahogany, and other wood species can be ink jet printed on the article surface to replicate real wood-simulated surface appearances.
  • Even exotic wood grain patterns such as leopard wood grain patterns and other patterns can be ink-jet printed.
  • Some patterns which may be capable of laser marking, such as the twisted rope design 312 may be ink-jet printed to speed production.
  • FIG. 5 is a cross-sectional view taken along sectional line V-V of FIG. 3 .
  • the recesses formed in an article surface via laser marking are relatively shallow and lack substantial depth. Such shallow recesses alone do not necessarily create a realistic impression of three-dimensionality typically achieved by routing and millwork. It is apparent in many instances that the article is a monolithic artificial body with no more than surface markings.
  • a second graphic design element is ink-jet printed in registry with the laser marked first graphic design element on the article surface.
  • certain ink jet printers may be configured to apply graphic design elements in the laser marked recesses.
  • one or more ink-jet printed graphic design elements are designed to create an enhanced three-dimensional impression, such as an illusion (or user perception) that the laser marked first graphic design element has an enhanced depth greater than its actual depth.
  • the ink-jet printed graphic design elements may simulate shading or lighting for this purpose.
  • the ink jet printed graphic design elements may be applied within the confines of the channel 308 or immediately adjacent to the channel 308 , that is, on the edge of the exterior surface of the major planar portion 302 and the interior panels 310 .
  • methods for surface marking articles with registered graphic design elements may produce articles with highly ornate, realistic appearances closely replicating the look of more expensive materials such as wood, stone, and ceramic.
  • high costs of specific alternatives such as unique mold tooling and routing to applying a three-dimension feature to the article become unnecessary.
  • FIG. 6 is a flowchart of a method for marking a surface of an article according to another embodiment of the invention.
  • the method of FIG. 6 illustrates one method of using exemplary software for creating a graphic design and converting the graphic design into computer readable media for a laser marker and an ink jet printer.
  • the graphic design is created using Adobe Illustrator, a vector based rendering program 602 .
  • different vector-based rendering programs can be used to create the graphic design.
  • the graphic design can be received from an optical scanner or optical reader.
  • Different elements of the graphic design can be manually or automatically selected for lasing and printing, respectively. Such elements may comprise specific features of the graphic design, such as channels or recesses, colors or tones, or specific sections of the graphic design.
  • a software program automatically identifies features best suited for either laser marking or ink-jet printing, based on predetermined criteria.
  • an operator manually identifies or assigns various elements of the graphic design for laser marking or ink-jet printing.
  • first graphic design elements features and/or sections of the graphic design designated for laser marking
  • second graphic design elements may be stored together in one unified image file or separately in respective image files.
  • the graphic design is divided into a laser graphic template and an ink-jet graphic template.
  • the laser graphic template includes those features of the graphic design that will be processed using vector-based programs.
  • the graphic design elements that are laser marked include lines and curves that define the outlines of the graphic and its major linear and curved features.
  • One or more vector-based rendering programs may create vector files with such features.
  • Other graphic design elements which may be laser marked include three-dimensional “fill” features such as gradient contours and surface textures.
  • Raster-based rendering programs may create one or more raster files with such features.
  • the vector-based rendering program AutoCAD® developed by AutoDesk®, Inc. creates a vector file 604 .
  • the vector-based program Cutting Shop of Arbor Image also creates a vector file with features such as special contoured fills 606 . Such contoured fills may be difficult or impossible to prepare with AutoCAD®.
  • Cutting Shop is a commercially available product of Arbor Image Corp. promoted for cutting and engraving applications.
  • other vector-based programs may be used to create laser markable graphic design elements.
  • Adobe Photoshop® is used to create a raster file containing a gray-scale image of three-dimensional “fill” features such as gradient contours and surface texture. Adobe Photoshop may produce a gray-scale image file comprising such fill features. From the gray-scale image, the raster-based program Technoblast® of Technolines LLC creates computer readable instructions for controlling the laser path and power for laser marking the “fill” features 608 .
  • the files may be “ripped,” or converted to a form which is understandable by a laser marker or an ink-jet printer.
  • the raster- and vector-based program Exodus is used to rip the files received from the AutoCAD®, Cutting Shop, and Technoblast® programs 612 .
  • the Exodus program rips the files into both a .dxf graphic (vector) file 616 and a .tbf graphic (raster) file 618 which can be utilized by the laser marker.
  • Laser markers and ink-jet printers are typically equipped with appropriate software to convert computer files into the laser and printer manufacturer's language.
  • the ink-jet graphic template may represent both the coloring of the graphic design and any fill patterns that are not appropriate for vector-based processing.
  • the raster-based rendering program Adobe Photoshop® is used to create a raster file containing coloring (e.g., tone, shading, background color) and printing information 610 .
  • the raster file is ripped to the ink-jet printer 614 .
  • the software program Wasatch SoftRIP Version 5.1.2 of Wasatch Computer Technologies, Inc. rips the raster file to the ink-jet printer controller compatible format.
  • the graphic design elements are laser marked 104 and ink-jet printed 106 onto the surface of the article to produce a completed sample 620 .
  • FIGS. 7-11 A system for laser marking and ink-jet printing graphic design on articles such as building components using a high-speed high power laser and ink-jet printer is shown in FIGS. 7-11 . It should be understood that the elements of the system described below are exemplary and are not necessarily intended to be limiting on the scope of the invention. Other systems and apparatus may be substituted for those described below, and the system and apparatus described below may be modified as dictated by the nature of the graphic pattern and the article.
  • FIG. 7 is a schematic view of a system for marking a surface of an article according to an embodiment of the invention.
  • a system according to one embodiment of the invention includes a workstation computer 702 , a laser controller 704 , a laser 706 , a laser scanner 710 , an ink-jet printer controller 712 , and an ink-jet printer apparatus 714 .
  • the workstation computer 702 can be configured to receive a graphic design to be applied to the work piece or article. As shown in FIG. 7 , the work piece comprises the door structure 300 , which comprises a printable surface 718 .
  • the workstation computer 702 is in operative communication with a laser controller 704 and a printer controller 712 .
  • the laser controller 704 communicates with a laser 706 and a laser scanner 710 for directing the path of a laser beam 708 .
  • the ink-jet printer controller 712 communicates with an ink jet printing apparatus 714 , discussed in greater detail below.
  • the workstation computer 702 may be, for example, a personal computer system. Computer hardware and software for carrying out the embodiments of the invention described herein may be any kind, e.g., either general purpose, or some specific purpose such as a workstation.
  • the workstation computer 702 may be a Centrino® or Pentium® class computer, running Windows XP®, Windows Vista®, Windows 7®, or Linux'. Alternatively, the workstation computer 702 may be a Macintosh® computer.
  • the computer program loaded on the workstation computer 702 may be written in C, C++, C#, Java, Brew or any other suitable programming language.
  • the program may be resident on a storage medium, e.g., magnetic or optical, of, e.g., the computer hard drive, a removable disk or media such as a memory stick or SD media, or other removable medium.
  • the programs may also be run over a network, for example, with a server or other machine sending signals to one or more local machines, which allows the local machine(s) to carry out the operations described herein.
  • Computer aided design (CAD) software can be employed.
  • the laser 706 generates a laser beam 708 which is passed through the laser scanner 710 .
  • the laser controller 704 controls the laser scanner 710 to direct the path of laser beam 708 across the surface of the door structure 300 .
  • the laser scanner 710 directs the path of the laser beam 708 using relatively light weight coated mirrors (discussed below).
  • the laser controller 704 is capable of controlling the movement of the lightweight mirrors of the laser scanner 710 and simultaneously adjusting power to the laser 706 to direct laser beam output 708 a along a path that forms the first graphic image element on the door structure 300 .
  • the laser scanner 710 and ink-jet printing apparatus 714 are in close proximity to a working platform, or bed, 716 that supports the door structure 300 , which in the illustrated embodiment is a door structure in a pre-fabricated state.
  • the door structure 300 may alternatively be a door skin or door facing.
  • the laser scanner 710 is “upstream” of the ink-jet printer apparatus 714 .
  • the ink-jet printer apparatus may be upstream of the laser scanner 710 .
  • various embodiments may comprise multiple lasers 706 and/or multiple ink-jet printer apparatus 714 .
  • relative movement may comprise movement of the directed laser beam 708 a and/or movement of an ink-jet print head of the ink-jet printer apparatus 714 in proximity to the door structure 300 and/or working platform 716 while the bed 716 and/or door structure 300 remain stationary. Relative moment may further comprise movement of the working platform 716 and/or door structure 300 while the directed laser beam 708 a and the ink jet print head of the ink-jet printing apparatus 714 remain stationary. Additionally, relative movement may comprise combined movement of the directed laser beam 708 a , ink-jet print head of the ink-jet printer apparatus 714 , bed 716 and/or door structure 300 .
  • FIG. 8 is a schematic view of a laser controller and laser of the system of FIG. 7 according to an embodiment of the invention.
  • the system shown in FIG. 8 comprises the workstation computer 702 , which is in communication with the laser controller 704 .
  • the laser controller 704 is in communication with the laser 706 , an x-axis galvanometer 802 , a y-axis galvanometer 806 , and a tank 812 .
  • the laser scanner 710 comprises a computer-controlled mirror system.
  • the illustrated mirror system includes an x-axis mirror 804 rotatably mounted on and driven by an x-axis galvanometer 802 .
  • the x-axis galvanometer 802 is adapted to rotate and cause the rotation of the x-axis mirror 804 .
  • Rotation of the x-axis mirror 804 while the laser beam 708 is incident on the mirror 804 causes the laser beam 708 incident on mirror 808 to move along the x-axis.
  • the laser controller 704 may be configured to control rotation of the x-axis mirror 804 by the x-axis galvanometer 802 by regulating the power supplied to the x-axis galvanometer 802 .
  • the laser beam 708 is deflected by the x-axis mirror 804 and directed toward a y-axis mirror 808 rotatably mounted on y-axis galvanometer 806 .
  • the y-axis galvanometer 806 is adapted to rotate and cause rotation of the y-axis mirror 808 .
  • Rotation of the y-axis mirror 808 causes movement of the laser beam 708 incident on mirror 808 along the y-axis.
  • the laser controller 704 may also be configured to control rotation of the y-axis mirror by the y-axis galvanometer by regulating of the power supplied to the y-axis galvanometer 806 .
  • the speed and power of the laser 708 a are regulated to reproduce high resolution graphic elements with the laser marker.
  • the laser controller 704 may rotate the x-axis galvanometer 802 and the y-axis galvanometer 806 at high rates to increase the speed of the directed laser beam 708 a across the surface of the door structure 300 .
  • the speed of the directed laser beam 708 a may determine the appropriate power level for the laser as the graphic is laser marked. Certain characteristics of the graphic design, such as the complexity, intricacy, and depth of the design may influence how the graphic design is laser marked onto the door structure 300 .
  • the laser beam 708 is deflected by the y-axis mirror 808 and directed through a focusing apparatus 810 adapted to focus the laser beam 708 into a directed laser beam 708 a .
  • the focusing apparatus 810 may comprise a multi-element flat-field focusing lens assembly, which optically maintains the focused spot (i.e. focal point) on a flat plane as the directed laser beam 708 a moves across the door structure 300 to laser mark a graphic design element such as a channel 308 .
  • the lens 810 , mirrors 804 , 808 and galvanometers 802 , 806 can be housed in a galvanometer block.
  • the working platform 716 can be a solid substrate or even a fluidized bed.
  • the door structure 300 is placed on the working platform 716 .
  • the door structure 300 comprises a viewable, laser markable and ink-jet printable surface, which in an exemplary embodiment corresponds to the exterior surface of a door skin.
  • the working platform 716 can be adjusted vertically to adjust the distance from the lens 810 to the printable surface 718 .
  • the laser beam 708 is directed by the mirrors 804 , 808 to cause the directed laser beam 708 a to be incident on the surface of the door structure 300 .
  • the directed laser beam 708 a is typically directed along a path generally perpendicular to the laser-markable surface 718 , but different graphics can be achieved by adjusting the angle between the directed laser beam 708 a and the laser-markable surface 718 , for example, from about 45° to about 135°. Relative movement between the directed laser beam 708 a incident on the laser-markable surface 718 of the door structure 300 causes a graphic such as channel 12 to be laser marked on the laser-markable surface 718 .
  • relative movement may involve movement of the directed laser beam 708 a (e.g., using the mirror system) as the door structure 300 remains stationary, movement of the door structure 300 while laser directed laser beam 708 a remains stationary, or a combination of simultaneous movement of the directed laser beam 708 a and the door structure 300 in different directions and/or at different speeds.
  • a graphic design is scanned or otherwise input into the workstation computer 702 and converted into the proper format, e.g., digitized.
  • Information corresponding to the laser marked features of the graphic image is communicated to the laser controller 704 with instructions to laser mark graphic design elements on to their corresponding sections.
  • the laser controller 704 subsequently controls movement of the galvanometers 802 , 806 and the power output of the laser 706 to laser mark the first graphic design element on the working surface 718 of the door structure 300 at the appropriate power and movement velocity for high throughput.
  • the laser beam power, laser beam size, and laser beam speeds may be controlled to avoid any undesirable consequences of over-treatment, such as complete carbonization, burn-through and/or melting of the door structure 300 .
  • the system can also include a tank 718 to inject a gas such as an inert gas into the work area. The amount of gas may be controlled by the workstation computer 702 , laser controller 704 , or some other apparatus.
  • a 2,000 watt laser is coupled to an ultra high speed laser scanner 710 capable of moving the laser beam 708 a across the printable surface 718 in excess of 30 meters per second.
  • lasers with other power measurements, up to and above 2,500 watts, and laser scanners with different scan speeds, up to and above 65 meters per second are utilized.
  • Laser scan speeds of 30-50 meters per second can mark graphic designs in time frames measured in seconds per square foot and unit costs measured in pennies per square foot.
  • “speed” is the speed of the directed laser beam 708 a relative to the working surface 718 .
  • Relative speed may be controlled by moving the directed laser beam 708 a while maintaining the work surface 718 in a stationary position, by moving the work surface 718 while maintaining the directed laser beam 708 a in a stationary position, or by simultaneously moving the directed laser beam 708 a and the working surface 718 in different directions and/or at different rates.
  • a high-speed high-power laser is used to form the first graphic design element on the surface of the door structure 300 .
  • the laser 706 may be a high power CO 2 laser having an output power of 500 W, 1000 W (1 kW), 2000 W (2 kW), 2500W (2.5 kW), or greater.
  • the laser power output referred to herein is continuous, as distinguished from the power output when a laser has a temporary energy surge, or when the laser is pulsed.
  • the continuous power can be varied by adjusting the power setting on the laser 706 .
  • the frequency of the laser beam 708 is typically in the range of, for example, 10 to 60 kHz.
  • An exemplary commercial laser, such as a 2.5 kW CO 2 laser, model number DC025, is available from Rofin-Sinar Technologies, Inc.
  • the scan speed of such a laser system may be an order of magnitude higher than the laser scan speeds achieved with either linear drives or conventional galvanometer mirrors.
  • laser scan speeds in excess of 65 meters per second can be achieved compared to maximum scan speeds of 4-5 meters per second with conventional laser engraving technology.
  • a system for laser etching plastic lumber in a continuous process for mass production may comprise a 2,500 watt laser operating at high speeds and directed at a working surface of 50.8 cm (20 inches) to match the line speed of the process.
  • laser powers of 500 watts and higher e.g., from 500-2,500 watts
  • laser scan speeds of 10 meters per second and higher e.g., from 10-50 meters per second
  • Reductions in the actual unit costs could be reduced an order of magnitude, from dollars-per-square-foot to cents-per-square-foot, by increasing the laser speed from 3.8 meters per second to, for example, 50 meters per second.
  • Systems and methods for surface marking articles may be carried out using various other laser systems and scanning devices, having modified and alternative layouts and elements to that shown in FIG. 8 .
  • Examples of laser systems are disclosed in U.S. Patent Application Publication No. 2007/0108170 to Costin et al. and WO/2008/156620 to Costin et al, the disclosures of which are incorporated by reference.
  • the ink jet printing apparatus 714 is configured to ink jet print graphic designs on a work piece such as the door structure 300 .
  • the door structure 300 which comprises a printable surface 718 , is supported on the working platform 716 , which may be the same working platform or different working platform used to support the door structure 300 during laser marking.
  • the working platform 716 is capable of supporting multiple objects and moving the objects relative to the ink-jet printing apparatus 714 for continuous manufacturing.
  • FIG. 9 is a schematic view of an ink-jet printing apparatus of the system of FIG. 7 according to an embodiment of the invention.
  • the ink jet printing apparatus 714 comprises coating station 902 , drying station 904 , printing station 906 , topcoat station 910 , and topcoat curing station 912 .
  • a work piece, such as door structure 300 may move on the working platform 716 in a sequential order through the ink-jet printing apparatus 714 , moving from the coating station 902 to the drying station 904 , the printing station 906 , the topcoat station 910 , and finishing at the topcoat curing station 912 .
  • the coating station 902 may be configured to spray or otherwise apply a ground coat to the exterior surface of the door structure 300 .
  • Multiple ground costs may be applied to the exterior surface of the door structure 300 , such as a first ground coat on the major planar portion 302 and interior panels 310 and a second ground coat in the channels 308 .
  • the second ground coat may provide a suggestion of shadowing in the channels 308 .
  • a darker tone in the channels 308 can provide a richer appearance.
  • the ground coat(s) may comprise a colored paint, such as a color simulating a wood tone such as mahogany.
  • the coating station 902 may comprise a manual spray gun or an automatic robotic sprayer. If a wood grain pattern is to be ink-jet printed or laser marked, the ground coat(s) may contribute to replication of the background tone of the wood grain pattern.
  • the door structure may enter a drying station 904 .
  • the drying station 904 may cure or dry the one or more ground coats of the door structure 300 .
  • the drying station 904 may include an induction radiation heater for drying the ground coat, or some other pigment drying device.
  • the door structure 300 is then forwarded to a printing station 906 and the selected image is ink-jet printed on the exterior face of the door structure 300 .
  • the printing station 906 may comprise a UV-curing lamp 908 .
  • the ink printed on the exterior surface of the door structure 300 is UV-curable.
  • One commercially available UV-curable ink is Sericol UviJet curing ink; however other UV-curing inks may be used.
  • the UV-curable ink is then cured by the UV-curing lamp 908 .
  • the door structure 300 may enter the topcoat station 910 .
  • the topcoat station 910 may apply a topcoat or protective layer, such as a UV curable coating.
  • the topcoat may be, for example, a clear varnish.
  • the topcoat may be sprayed or otherwise applied to the exterior surface of the door structure 300 .
  • the topcoat may be dried at a UV topcoat curing station 912 .
  • FIG. 10 is a schematic view of a printing station of the printing apparatus of FIG. 9 according to an embodiment of the invention.
  • the printing station 906 comprises an ink-jet printer 1002 which includes at least one ink-jet print head 1004 .
  • the ink-jet print head 1004 is in communication with the ink-jet printer controller 712 .
  • the ink-jet print head 1004 is mounted for movement in a direction perpendicular to the direction of movement of the door structure 300 .
  • Arrow 1006 shows the direction of movement of the ink-jet print head 1004
  • arrow 1008 shows the direction of movement of the working platform 716 .
  • the ink-jet print head 1004 is preferably movable along direction 1006 across the entire width of the door structure 300 .
  • the printer 1002 may be a flat bed printer, such as available through Inca Digital Printers Limited of Cambridge, United Kingdom.
  • FIG. 11 is a schematic view of the ink-jet printer of FIG. 9 according to an embodiment of the invention.
  • the printer 1002 includes a rail 1102 for supporting the ink-jet print head 1004 .
  • the rail 1102 provides for lateral movement of the ink-jet print head 1004 under the control of the ink-jet print controller 712 .
  • the ink-jet print head 1004 is shown with a UV curing lamp 1104 for drying and curing the ink-jet ink.
  • a separate curing station such as UV-curing lamp 908 , may be provided.
  • Ink jet ink droplets 1106 are emitted from nozzles 1108 of the ink-jet print head 1004 .
  • the nozzle outlets of the ink-jet print head 1004 travel in a plane P 2 that is separated from plane P of door structure 300 by a space G. Therefore, the distance traveled by ink droplets 1106 emitted from nozzles 1108 varies depending on whether the ink-jet print head 1004 is over the planar portion (e.g., major planar portion 11 or panels 14 ) or over one of the channels 308 . If the distance is too great, the ink-jet printed images may become blurred, particularly in the channels 308 .
  • the nozzles 1108 have a diameter of up to and above 20 microns.
  • the droplets 1106 will have a diameter approximately equal to the diameter of the nozzles 1108 .
  • a Spectra NovaJet 256 ink jet print head may be used, which creates droplets having a diameter of about 40 microns.
  • the relative speed of the ink-jet print head 1004 and the and the angle of the nozzles 1108 relative to plane P 2 (for example, the nozzles 1108 may be tilted) defines the incident angle at which a droplet 84 is emitted from the nozzle 1108 relative to the upper face of the door structure 300 .
  • the ink jet printer 1002 may include multiple ink-jet print heads 1004 arranged in rows or arrays, so that each pass may effective print in more than one set of print grid positions.
  • the nozzles 1108 may emit ink-jet droplets 1106 of various desired colors in order to create a desired color. More description and information concerning the ink jet printing apparatus 714 can be found in U.S. Pat. No. 7,001,016, the disclosure of which is incorporated herein by reference.
  • Table II contains data for 32 laser lines per inch and Table III contains data for 60 laser lines per inch.
  • Table II contains data for 32 laser lines per inch and Table III contains data for 60 laser lines per inch.
  • Table II contains data for 32 laser lines per inch and Table III contains data for 60 laser lines per inch.
  • Table II contains data for 32 laser lines per inch and Table III contains data for 60 laser lines per inch.
  • a graphic image with 32 lines per inch requiring the laser power to change every 2 pixels can achieve a maximum laser span speed of 15 m/s at a controller speed of 10,000 pixels per second (see Table II).
  • the controller should have a processing power of 20,000 pixels per second.
  • the controller speed becomes more important for maintaining high laser line speed.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Laser Beam Processing (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Thermal Transfer Or Thermal Recording In General (AREA)
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WO2010083481A2 (en) 2010-07-22
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