EP0033776B1 - Process and apparatus for colouring or printing web-like items, particularly ski-coverings, and such articles - Google Patents

Process and apparatus for colouring or printing web-like items, particularly ski-coverings, and such articles Download PDF

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Publication number
EP0033776B1
EP0033776B1 EP80107678A EP80107678A EP0033776B1 EP 0033776 B1 EP0033776 B1 EP 0033776B1 EP 80107678 A EP80107678 A EP 80107678A EP 80107678 A EP80107678 A EP 80107678A EP 0033776 B1 EP0033776 B1 EP 0033776B1
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EP
European Patent Office
Prior art keywords
foil
printed
printing
approximately
roll gap
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.)
Expired
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EP80107678A
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German (de)
French (fr)
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EP0033776A2 (en
EP0033776A3 (en
Inventor
Horst Custor
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Cp Components Kunststoff-Bauteile GmbH
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Cp Components Kunststoff-Bauteile GmbH
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Priority to AT80107678T priority Critical patent/ATE6140T1/en
Publication of EP0033776A2 publication Critical patent/EP0033776A2/en
Publication of EP0033776A3 publication Critical patent/EP0033776A3/en
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    • 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
    • B41M1/26—Printing on other surfaces than ordinary paper
    • B41M1/30—Printing on other surfaces than ordinary paper on organic plastics, horn or similar materials
    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63C—SKATES; SKIS; ROLLER SKATES; DESIGN OR LAYOUT OF COURTS, RINKS OR THE LIKE
    • A63C5/00—Skis or snowboards
    • A63C5/003—Structure, covering or decoration of the upper ski surface
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F16/00—Transfer printing apparatus
    • 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
    • B41M5/025—Duplicating or marking methods; Sheet materials for use therein by transferring ink from the master sheet
    • B41M5/035—Duplicating or marking methods; Sheet materials for use therein by transferring ink from the master sheet by sublimation or volatilisation of pre-printed design, e.g. sublistatic
    • B41M5/0358—Duplicating or marking methods; Sheet materials for use therein by transferring ink from the master sheet by sublimation or volatilisation of pre-printed design, e.g. sublistatic characterised by the mechanisms or artifacts to obtain the transfer, e.g. the heating means, the pressure means or the transport means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M7/00—After-treatment of prints, e.g. heating, irradiating, setting of the ink, protection of the printed stock
    • B41M7/009—After-treatment of prints, e.g. heating, irradiating, setting of the ink, protection of the printed stock using thermal means, e.g. infrared radiation, heat

Definitions

  • the invention relates to a method for dyeing or printing sheet-like objects, in particular ski coverings, from thermoplastics, in which the color under the action of heat and pressure is applied by a continuously moving printing medium on which a print image of dyes that are first sublimable and then diffused in is applied is only transferred along essentially a narrow area strip transversely to the common conveying direction of the covering and the printing medium to the covering which is continuously moved in the same way, as well as a device for carrying out this method and a web-shaped object printed in this way.
  • the inside of the running surface (or also the deck surface) is printed to reflect the ski manufacturer, type designations etc. in particular; this pressure is then visible through the transparent covering.
  • the transfer printing process according to DE-A-2 642 350 has also proven to be relatively complex and difficult to control.
  • the surface to be printed on high-pressure and low-pressure polyethylene is previously coated with a dye-affine thermoplastic layer, e.g. B. polyurethane or polyester Layer is provided, which is printable without difficulty.
  • US-A-4 059 471 always refers only to the so-called “softening temperature of the covering to be printed and not to the“ melting temperature ”in connection with the ink transfer.
  • the term “still hot extruded sheet in column 2 No. 63, US Pat. No. 4,059,471 also means that the extruded coating has already cooled down so much during printing that it no longer melts (thermoplastic). located, but is only "softened or thermoelastic". Accordingly, the ink transfer area or roller gap must also be far from the extruder for the coating to be printed.
  • those skilled in the art are described by US-A-4 059 471 u. a. instructed to soften the covering to be printed only on the surface to be printed, which leads to warpage when it cools down due to internal tensions.
  • DE-A-2731 121 now teaches, among other things, to print on polyethylene in that the side to be printed on a shaped body under pressure and heat in contact with a printing medium, for. B. paper print carrier is brought onto which a print image of first sublimable and then diffused dyes has been applied beforehand. 160-220 ° C. is stated as an advantageous temperature. 5-30 seconds are suggested as sufficient pressing time of the print carrier on the surface to be printed. Under the conditions specified in DE-A-2 731 121, however, exactly the same migration problems occur which, according to DE-A-2 642 350, are sought to be avoided by coating the side to be printed beforehand separately.
  • US-A-1 825 342 a method for printing web-shaped objects with "thermoplastic components". Primarily semi-synthetic textiles is known. Printing such objects by means of thermal transfer printing does not present any great difficulties, as also in the mentioned DE- A-2731 121.
  • US-A-1 825 342 suggests first dissolving the desired color in wax, preferably beeswax, in order to then apply the wax-color mixture to a printing medium made of paper, fabric or the like
  • the semi-synthetic fabric web to be printed should be printed with a suitable solvent before printing treated or wetted, which releases the dyes in the ink transfer area (roller gap through which the fabric web and the printing medium are continuously passed).
  • the printing on the fabric web is therefore primarily effected by the solvent mentioned, with which the web to be printed is treated, the ink transfer taking place at only a slightly elevated temperature (50-60 ° C.).
  • the dyes released from the wax are therefore coldly applied to the fabric web, preferably with simultaneous embossing of the fabric web.
  • FR-A-2 318 742 a method for simultaneous printing and embossing of fabrics by sublimation transfer is known, the printing taking place at temperatures of 170 to 230 ° C. Due to the device, the color transfer time is relatively long in the known method. It takes place at relatively low pressure almost over the entire circumference of an impression roller, over which the fabric to be printed and a print carrier are guided. The ink transfer is therefore not concentrated on a narrow nip.
  • the present invention is based on the object of developing a method and a device of the type mentioned in such a way that sharp, distortion-free brilliant prints are obtained and warpage problems and difficulties in removing a paper print carrier from the printed covering are avoided.
  • the sheet-like object to be printed is thoroughly in the melt state, so that a uniform crystallite formation takes place over the cross section during cooling. Internal thermal stresses cannot occur in the solution according to the invention.
  • a temperature-controlled cooling of the printed film is preferably carried out in a second long-term process stage of approximately 10-15 seconds. This measure promotes uniform crystallization over the entire thickness of the printed film.
  • the thermo-controlled cooling in particular prevents the inclusion of thermal voltage nests, which, for. B. could form with too rapid cooling.
  • the measure according to claim 13 has proven to be particularly conducive to the preservation of sharp, distortion-free printed images, as a result of which a rotation of the melt, which may otherwise be minor, is present the accumulation zone in the nip (especially when there is a major difference between the two rollers) is avoided. A zero relative movement between the dye and melt elements is ensured.
  • the color strength of the printing is further increased or a better color contrast is achieved.
  • this lamination or gluing enables a slight transfer of printing ink from the covering (film) into the adhesive and / or the reinforcing material layer, which "fixes" the printed image even more deeply in the finished composite component.
  • the measures according to claim 31 permit the already printed (cold) sheet-like objects or foils to be subsequently printed, the heated pressure rollers advantageously serving at the same time for holding the foil and the printing medium in contact and for tempering the foil.
  • a film 2 of thermoplastic material emerges from the extrusion tool 1 in the form of a melt plume.
  • An auxiliary printing medium 3 is unwound from a supply roll 4 and conveyed by a conveyor roller 5 to a nip formed by a heated roller 6, in which it is brought into contact with the film 2 in the form of a melt plume.
  • the roller gap is dimensioned (cf. more precisely in FIG. 2) that a wedge-shaped accumulation zone 2a is formed, as can be clearly seen from FIG. 1.
  • the system installation takes place in the storage zone 2a, which is already described in detail in the introduction.
  • the printed film 2 'then preferably runs past an aftertreatment device 12, which acts by means of a high-frequency corona discharge or an oxidizing flame.
  • the printed film 2 ' is then wound onto a take-up roll 11 via a deflection roller 10 in order to be able to be further processed later.
  • rollers 5, 6 are shown with essentially the same diameter, it goes without saying that their diameter can be quite different, e.g. B. the roller 5 can have a considerably smaller diameter than the roller 6.
  • the only schematically indicated tempering device 7 can, for. B. be formed by a cooling air flow channel, wherein the cooling air is supplied at the arrowed end.
  • the aftertreatment device 12 has a structure which is known per se.
  • the print carrier is a so-called auxiliary print carrier 3, in that after the delivery of its print image to the film 2 to be printed, it is brought out of contact again, namely wound onto the take-up roll via the deflection roller as already explained.
  • the print carrier 3 with the film 2 enters into a permanent connection if, for. B. the print carrier should perform other functions. In this case, the deflection roller and the take-up roller 9 would be omitted in FIG. 1.
  • FIG. 2 A preferred embodiment of the invention for a polyethylene film to be printed is shown in more detail in Fig. 2, to the details of which reference is made directly.
  • the nip length I is strictly to be understood as the length of the accumulation zone 2a, specifically between the first impact of the film 2 on the circumference of the rollers 5 and 6 in the conveying direction (cf. the arrow) and the narrowest one Nip width s corresponding point of the nip (see Fig. 2, the two broken lines that delimit the double arrow 1).
  • P denotes the line pressure over the circumference of the rollers 5 and 6.
  • the temperature distribution of the film 2 over the circumference of the roller 6 can be seen from the corresponding diagram “film temperature in FIG. 2.
  • This temperature distribution is due to the fact that the film 2, which exits the extrusion die 1 at a high temperature anyway, namely at approximately 225 ° C. for high molecular weight polyethylene, then, despite the heat supply from the rollers 5 and 6, the (e.g. by means of oil circulation heating) to temperatures of e.g. B. are heated to about 70 ° C or about 110 ° C, cools when leaving the nip.
  • the first installation takes place in the nip area, as it is composed of the circumferential arcs of 15 ° and 10 ° (cf. the graphic representation within the roller 5), because there the required high pressure (more precisely: line pressure P due to the fact that the film 2 and the printing medium 3 are brought into contact according to the invention in a strip-shaped, ie essentially linear, zone) and also the required high temperature (cf. also the film Temperature curve inside the roller 6 with high values in the circumferential arc of 0-15 ° after the narrowest point of the roller gap) prevail.
  • the required high pressure more precisely: line pressure P due to the fact that the film 2 and the printing medium 3 are brought into contact according to the invention in a strip-shaped, ie essentially linear, zone
  • the required high temperature cf. also the film Temperature curve inside the roller 6 with high values in the circumferential arc of 0-15 ° after the narrowest point of the roller gap
  • the pressure setting is not critical.
  • the z. B. can be formed by a hot air flow channel or by infrared radiators.
  • the speeds or peripheral speeds of the two rollers 5 and 6 should be set so that a zero relative speed between the film 2 and the print carrier 3 and thus a clean print is achieved.
  • the arrangement of the extrusion tool 1 with its opening relative to the nip between the rollers 5 and 6 is such that the inlet angle of the film 2 is approximately 10-15 ° to the nip central axis, specifically to the conveyor roller 5 of the auxiliary -Print carrier 3 out, is.
  • a pressing device which is formed by pressing rollers 17, to which a tempering device in the form of a Warm air flow channel 18 is assigned, so that the temperature decrease indicated in relation to different pressure rollers 17 results in the conveying direction.
  • FIG. 1 an embodiment which is fundamentally different from FIG. 1 is shown, namely that the film 22 is not fed from an extrusion tool, but is unwound from a supply roll 21a in the initially cold state and then via a deflection roller 24a to one Preheat roller 26 arrives, where it is heated to above the crystallite melting point of its material, and finally passes another deflection roller 27 into the nip formed by two calender rollers 35, 36, to which a pressure carrier 23 is simultaneously fed, which previously from a supply roll 21 b via a deflecting roller 24b and a preheating roller 25, which preheats to about 50-70 ° C, has been unwound.
  • the film and the print carrier pass through a second pressing device 37, the heat treatment advantageously being carried out by the pressing rollers 37a and 37b themselves, by heating them accordingly, and the pressing rollers on the left in FIG. 6 have a lower temperature than that right.
  • the print carrier 23 exhausted from the printed image is wound onto a winding roll 39 via a deflection roller 38, whereas the printed film 22' is wound onto a winding roll 41 via deflection rollers 40 and 40a.
  • a double belt press which has become known per se (e.g. from Sandvik) and which has a combined contact pressure heat treatment device, provided that particularly high values of contact pressure in the first section in the conveying direction Pressure and temperature are set in order to carry out the first stage of bringing the film and pressure carrier of the method according to the invention into place there.
  • roller 6 or the calender roller 36 can be provided with an embossing profile, in order to simultaneously emboss the foil 3 or 22, which will later serve as a covering, when printing on the foil, for example when B. the surface should be provided with climbing aids (e.g. shed) for cross-country skiing.
  • embossing profile in order to simultaneously emboss the foil 3 or 22, which will later serve as a covering, when printing on the foil, for example when B. the surface should be provided with climbing aids (e.g. shed) for cross-country skiing.

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  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Thermal Sciences (AREA)
  • Toxicology (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Printing Methods (AREA)
  • Thermal Transfer Or Thermal Recording In General (AREA)
  • Laminated Bodies (AREA)
  • Coloring (AREA)

Abstract

The invention refers to a process of coloring (printing) of track-like objects (2), especially ski coverings of thermoplastics, such as olefins, especially high and low pressure polyethylene where, the layer is brought continuously as a hot foil, essentially in a state of fusion, in contact with a print carrier (3), on which there has been deposited a print pattern first of sublimation type and then of diffusion type dye stuff. A transfer of the dye onto foil (2) occurs in a short time and only essentially along a small areal strip perpendicular to the common direction of conveying of layer (2) and print carrier (3). It is preferred that the transfer of dye occurs in the gap between rollers (5, 6) through which the foil and the print carrier are guided. This allows the obtainment of warpage-free print patterns on relatively thin-walled track-like objects in a continuous process, where it is assured that no warpages occur after cooling or reheating of the printed layer. Also, migration problems are avoided by means of short-term locally limited penetration under high pressure in the roller gap.

Description

Die Erfindung betrifft ein Verfahren zum Färben oder Bedrucken von bahnförmigen Gegenständen, insbesondere Skibelägen, aus Thermoplasten, bei dem von einem kontinuierlich bewegten Druckträger, auf dem ein Druckbild aus zuerst sublimier- und dann eindiffundierbaren Farbstoffen aufgetragen ist, die Farbe unter Einwirkung von Wärme und Druck nur entlang im wesentlichen eines schmalen Flächenstreifens quer zur gemeinsamen Förderrichtung des Belages und des Druckträgers auf den in gleicher Weise kontinuierlich bewegten Belag übertragen wird, sowie eine Vorrichtung zur Durchführung dieses Verfahrens und einen derartig bedruckten bahnförmigen Gegenstand.The invention relates to a method for dyeing or printing sheet-like objects, in particular ski coverings, from thermoplastics, in which the color under the action of heat and pressure is applied by a continuously moving printing medium on which a print image of dyes that are first sublimable and then diffused in is applied is only transferred along essentially a narrow area strip transversely to the common conveying direction of the covering and the printing medium to the covering which is continuously moved in the same way, as well as a device for carrying out this method and a web-shaped object printed in this way.

Bekanntlich werden seit längerem sogenannte mehrschichtige Skier durch Verkleben mehrerer Schichten hergestellt (vgl. z. B. DE-A-2 804 943), die ihrerseits einen Unter - einen Mittel - und einen Oberbau bilden.

  • - Der Mittelbau besteht im allgemeinen aus einem Holz- oder Hartschaum-Kern, der seitlich mit duroplastischem Kunstharz-Schichtstoff kaschiert ist ;
  • - der Oberbau besteht meistens aus einem mit dem Kern verklebtem Aluminiumblech und/oder Laminat aus glasfaserverstärktem Kunststoff (GFK), worauf als Deckbelag eine Kunststoff-Folie aufkaschiert ist, die in weiteren Arbeitsvorgängen dekorativ ausgestaltet wird ;
  • - der Unterbau besteht seinerseits aus einem Aluminiumblech oder einer Schicht aus glasfaserverstärktem Kunststoff (GFK), das bzw. die an einer Seite mit dem Kern verklebt ist und an der anderen Seite (ggf. über verschiedene weitere Schichten) schließlich mit dem eigentlichen LaufBelag verklebt ist, der im allgemeinen ein transparenter 1-2 Millimeter dicker Kunststoffbelag ist, und zwar vorzugsweise aus Polyäthylen, nämlich Hochdruck- oder Niederdruck-Polyäthylen, oder Polytetrafluoräthylen.
It has been known for a long time that so-called multilayer skis have been produced by gluing several layers (see, for example, DE-A-2 804 943), which in turn form a lower - a middle - and a superstructure.
  • - The middle section generally consists of a wood or hard foam core, which is laminated on the side with thermosetting resin laminate;
  • - The superstructure usually consists of an aluminum sheet glued to the core and / or laminate made of glass fiber reinforced plastic (GRP), whereupon a plastic film is laminated on as a covering, which is decoratively designed in further work processes;
  • - The substructure in turn consists of an aluminum sheet or a layer of glass fiber reinforced plastic (GRP), which is glued to the core on one side and finally glued to the actual tread on the other side (possibly via various other layers) , which is generally a transparent 1-2 millimeter thick plastic covering, preferably made of polyethylene, namely high-pressure or low-pressure polyethylene, or polytetrafluoroethylene.

Normalerweise ist dabei die Innenseite des Lauf-Belags (oder auch des Deck-Belags) bedruckt, um insbesondere den Ski-Hersteller, Typenbezeichnungen usw. wiederzugeben ; dieser Druck ist dann durch den transparenten Belag hindurch sichtbar.Normally, the inside of the running surface (or also the deck surface) is printed to reflect the ski manufacturer, type designations etc. in particular; this pressure is then visible through the transparent covering.

Bisher werden im wesentlichen nur Hoch- und Niederdruck-Polyäthylen-Skibeläge eingesetzt.So far, only high and low pressure polyethylene ski bases have been used.

Das Dekorieren, insbesondere Bedrucken, derartiger Beläge und auch Weiterverarbeiten erfolgt bisher sehr aufwendig und trotzdem mit oft schlechter Druckqualität :

  • - Es wird stückweise, also nicht kontinuierlich bzw. endlos, vorgegangen, nämlich durch Siebdruck (von Mustern, Schriftzügen oder dergleichen, mit Epoxid-Druckfarben, wobei zusätzlich der Belag vor dem Bedrucken vorbehandelt werden muß, z. B. thermisch (Beflammen), elektrisch (Corona-Entladung) oder chemisch (Ätzen), da sonst die (Epoxid-)Druckfarbe nicht haften würde ;
  • - nach dem Bedrucken muß etwa 10-20 Stunden lang getrocknet werden, worauf dann der bedruckte und getrocknete Belag zum weiteren Dekorieren mit einer opaken (gefärbten) epoxidhaltigen Vergußmasse (einem Opakendecklack) einschließlich Härter abgegossen wird, um eine Hintergrundfarben-Schicht für den transparenten Belag zu schaffen ;
  • - diese Vergußmassen-Schicht wird dann mittels eines Klebers normalerweise mit einer Schicht aus glasfaserverstärktem Kunststoff (GFK) verklebt, allerdings erst nach einigen Stunden, nachdem aus der Vergußmasse vollständig das Lösungsmittel entwichen, also die Masse ausgehärtet ist.
Decorating, in particular printing, such coverings and further processing has so far been very complex and yet often with poor print quality:
  • - The process is carried out piece by piece, i.e. not continuously or endlessly, namely by screen printing (of patterns, lettering or the like) with epoxy printing inks, the covering also having to be pretreated before printing, e.g. thermally (flaming), electrical (corona discharge) or chemical (etching), otherwise the (epoxy) printing ink would not adhere;
  • - After printing, it must be dried for about 10-20 hours, after which the printed and dried covering is poured off for further decoration with an opaque (colored) epoxy-containing potting compound (an opaque top coat) including hardener, to form a background color layer for the transparent covering to accomplish ;
  • - This potting compound layer is then normally glued to a layer of glass fiber reinforced plastic (GRP) by means of an adhesive, but only after a few hours after the solvent has completely escaped from the potting compound, that is to say the mass has hardened.

Trotz dieses insbesondere sehr aufwendigen Herstellungsverfahrens ist es bisher nicht gelungen, eine gleichbleibende Druckqualität beim fertigen Ski zu sichern.Despite this particularly complex manufacturing process, it has so far not been possible to ensure consistent print quality in the finished ski.

Als zahlreiche Fehler, die oft erst ziemlich spät, nämlich 3-10 Monate nach der Herstellung des Skis, auftreten, kommen insbesondere in'Frage :

  • - Unzureichende Haftungs-Vorbehandlung des Belags vor dem Bedrucken ;
  • - Angreifen des Druckbilds durch den Kleber, so daß sich Farbtöne ändern, die Konturen des Druckbilds verschwimmen oder Risse innerhalb des Druckbilds auftreten ;
  • - mangelnde Elastizität der Vergußmasse gegenüber dem Belag bzw. unzureichende Haftung der Opakenvergußmasse am z. B. Polyäthylen des Belags, so daß das Ablösen der Vergußmasse sich in hellen Flecken auf der Laufflächen-Seite äußert ;
  • - unzureichendes Abdunsten des Lösungsmittels aus der Opakenvergußmasse, so daß dieses durch Blasenbildung zusätzlich Haftungsschwierigkeiten zwischen der Vergußmasse und dem z. B. Polyäthylen des Belags und damit unschöne helle Flecken verursacht.
As numerous errors, which often only appear quite late, namely 3-10 months after the production of the ski, there are in particular:
  • - Inadequate pre-treatment of adhesion of the covering before printing;
  • - attack of the printed image by the adhesive, so that color tones change, the contours of the printed image blur or cracks occur within the printed image;
  • - Lack of elasticity of the potting compound compared to the covering or insufficient adhesion of the opaque potting compound on the z. B. polyethylene of the covering, so that the detachment of the sealing compound manifests itself in light spots on the tread side;
  • - Inadequate evaporation of the solvent from the opaque potting compound, so that this creates additional adhesion problems between the potting compound and the z. B. Polyethylene of the covering and thus causes unsightly bright spots.

Ähnliche Schwierigkeiten wie für den Lauf-Belag treten auf, wenn ein entsprechender, zu dekorierender Belag als Deck-Belag verwendet wird.Difficulties similar to those for the running covering occur when an appropriate covering to be decorated is used as the covering covering.

Diese Schwierigkeiten stellen bis heute (trotz mindestens ca. 10 Jahren Erfahrung) immer noch ein ernstes Problem dar, da die Fehlerquellen im einzelnen nicht erforscht sind, so daß es häufig zu Reklamationen der Ski-Abnehmer bei den Ski-Herstellern kommt.These difficulties are still a serious problem (despite at least about 10 years of experience) because the sources of error have not been researched in detail, so that ski buyers often complain to the ski manufacturers.

Schließlich ist trotz allem Aufwands selbst die bestenfalls erreichbare Druckqualität sehr beschränkt auf nur relativ grobstrukturierte Druckbilder, d. h. der Druck von Fotografien mit Halbtönen ist praktisch unmöglich.After all, in spite of all the effort, even the print quality that can be achieved at best is very limited to only relatively coarse-structured print images, i. H. printing photographs with halftones is practically impossible.

Als relativ aufwendig und nur schwer beherrschbar hat sich auch das Transferdruckverfahren nach der DE-A-2 642 350 herausgestellt, bei dem zur Vermeidung der Migrationsförderung die zu bedruckende Oberfläche von Hochdruck- und Niederdruckpolyäthylen vorher mit einer farbstoffaffinen thermoplastischen KunststoffSchicht, z. B. Polyurethan- oder Polyester-Schicht, versehen wird, die ohne Schwierigkeiten bedruckbar ist.The transfer printing process according to DE-A-2 642 350 has also proven to be relatively complex and difficult to control. In order to avoid the promotion of migration, the surface to be printed on high-pressure and low-pressure polyethylene is previously coated with a dye-affine thermoplastic layer, e.g. B. polyurethane or polyester Layer is provided, which is printable without difficulty.

Die US-A-4059471, der sich das Verfahren sowie die Vorrichtung der eingangs genannten Art entnehmen läßt, bestätigt die genannten Probleme beim kontinuierlichen Bedrucken von Thermoplasten. Vor allem werden die Verschmelzungsprobleme zwischen dem Druckträger und dem zu bedruckenden Belag als besonders nachteilig dargestellt. Zur Vermeidung dieses Problems wird vorgeschlagen, zwischen dem zu bedruckenden Belag und dem Druckträger eine als

  • - Filter und
  • - Farbübertragungsmittel

dienende Zwischenschicht (dye-carrier-Schicht) anzuordnen, wobei diese Zwischenschicht auf der Druckfarbenseite des Druckträgers aufkaschiert ist. Dies bedeutet jedoch, daß der zu bedruckende Belag sich im Farbübertragungsbereich nicht mehr im Schmelzezustand befinden darf, da anderenfalls die auf den Druckträger aufkaschierte Zwischenschicht, die vorzugsweise aus einem Olefin - z. B. Polyäthylen - bestehen soll, glatt wegschmelzen und ihrer beabsichtigten Funktionen (Filter und Transmission) beraubt würde. Die durch die Zwischenschicht hindurchdiffundierenden Farbstoffe würden darüberhinaus mit dem dye carrier verlaufen, so daß konstraststarke Druckbilder nicht erhalten werden könnten. Auch bestünde die Gefahr, daß die Zwischenschicht und der Druckträger mit dem zu bedruckenden Belag unlösbar verschmilzt.US-A-4059471, which shows the method and the device of the type mentioned, confirms the problems mentioned in the continuous printing of thermoplastics. Above all, the merging problems between the print carrier and the covering to be printed are presented as particularly disadvantageous. To avoid this problem, it is proposed to use a as between the covering to be printed and the printing medium
  • - filters and
  • - paint transfer agent

to serve serving intermediate layer (dye-carrier layer), which intermediate layer is laminated on the printing ink side of the print carrier. However, this means that the coating to be printed must no longer be in the melt state in the ink transfer area, since otherwise the intermediate layer laminated onto the printing medium, which is preferably made of an olefin - e.g. B. Polyethylene - should exist, melt away smoothly and their intended functions (filter and transmission) would be robbed. The dyes diffusing through the intermediate layer would also run with the dye carrier, so that high-contrast printed images could not be obtained. There would also be a risk that the intermediate layer and the print carrier would inseparably fuse with the covering to be printed.

Aus den genannten Gründen verwundert es auch nicht, daß in der US-A-4 059 471 im Zusammenhang mit der Farbübertragung stets nur von der sogenannten « softening-Temperatur des zu bedruckenden Belages und nicht von der « melting-Temperatur » die Rede ist. Auch der Begriff « still hot extruded sheet in Sp. 2 Z. 63, der US-A-4 059 471 bedeutet, daß der extrudierte Belag bei der Bedruckung bereits so stark wieder abgekühlt ist, daß er sich nicht mehr im Schmelzezustand (thermoplastisch) befindet, sondern nur « aufgeweicht bzw. thermoelastisch » ist. Dementsprechend weit muß auch der Farbübertragungsbereich bzw. Walzenspalt von dem Extruder für den zu bedruckenden Belag entfernt sein. Im übrigen wird der Fachmann durch die US-A-4 059 471 u. a. angewiesen, den zu bedruckenden Belag nur an der zu bedruckenden Oberfläche zu erweichen, was bei dessen Abkühlung infolge innerer Spannungen zu Verwerfungen führt.For the reasons mentioned, it is not surprising that US-A-4 059 471 always refers only to the so-called “softening temperature of the covering to be printed and not to the“ melting temperature ”in connection with the ink transfer. The term “still hot extruded sheet in column 2 No. 63, US Pat. No. 4,059,471 also means that the extruded coating has already cooled down so much during printing that it no longer melts (thermoplastic). located, but is only "softened or thermoelastic". Accordingly, the ink transfer area or roller gap must also be far from the extruder for the coating to be printed. Incidentally, those skilled in the art are described by US-A-4 059 471 u. a. instructed to soften the covering to be printed only on the surface to be printed, which leads to warpage when it cools down due to internal tensions.

Die DE-A-2731 121 lehrt nun, unter anderem Polyäthylen dadurch zu bedrucken, daß die zu bedruckende Seite eines Formkörpers unter Druck und Wärme in Anlage an einen Druckträger, z. B. Papierdruckträger, gebracht wird, auf den vorher ein Druckbild aus zuerst sublimier-und dann eindiffundierbaren Farbstoffen aufgetragen worden ist. Als vorteilhafte Temperatur wird 160-220 °C angegeben. Als ausreichende Anpresszeit des Druckträgers an die zu bedruckende Fläche werden 5-30 Sekunden vorgeschlagen. Bei diesen in der DE-A-2 731 121 angegebenen Bedingungen treten jedoch genau dieselben Migrationsprobleme auf, die man nach der DE-A-2 642 350 dadurch zu vermeiden sucht, daß man die zu bedruckende Seite vorher gesondert beschichtet.DE-A-2731 121 now teaches, among other things, to print on polyethylene in that the side to be printed on a shaped body under pressure and heat in contact with a printing medium, for. B. paper print carrier is brought onto which a print image of first sublimable and then diffused dyes has been applied beforehand. 160-220 ° C. is stated as an advantageous temperature. 5-30 seconds are suggested as sufficient pressing time of the print carrier on the surface to be printed. Under the conditions specified in DE-A-2 731 121, however, exactly the same migration problems occur which, according to DE-A-2 642 350, are sought to be avoided by coating the side to be printed beforehand separately.

Beim Nacharbeiten des aus der DE-A-2 731 121 bekannten Verfahren erhält man ein Druckbild, das so verschwommen ist, daß der bedruckte Gegenstand unbrauchbar ist. Die Migrationsprobleme treten offenbar durch eine zu lange Anpresszeit unter hoher Wärme auf, wobei jedoch andererseits ein relativ hoher Anpressdruck erforderlich ist, um eine ausreichende Penetration der Farbstoffe in den Formkörper zu erreichen.When the method known from DE-A-2 731 121 is reworked, a printed image is obtained which is so blurred that the printed object is unusable. The migration problems apparently occur due to an excessively long contact time under high heat, but on the other hand a relatively high contact pressure is required in order to achieve sufficient penetration of the dyes into the molded body.

Beim Nacharbeiten des aus der DE-A-2 731 121 beschriebenen Verfahrens stellt man auch noch fest, daß durch das Aufweichen oder bei Anwendung entsprechend hoher Temperaturen Aufschmelzen der zu bedruckenden Fläche im Formkörper so große thermische Spannungen (Spannungsspitzen) entstehen, daß ein Bedrucken von relativ dünnwandigen, z. B. bahnförmigen Gegenständen, insbesondere Ski-Belägen, nicht möglich ist. Im Bereich der Grenzlinie zwischen der aufgeweichten oder aufgeschmolzenen Druckseite und der sich noch im festen Zustand befindlichen Unterseite erfolgt ein extremer Spannungsabfall, der beim Abkühlen zum Verzug des bedruckten Belages führt. Bei der Abkühlung des bedruckten Belages zeichnen sich die aufgeweichte oder aufgeschmolzene Druckseite und die sich noch im festen Zustand befindliche Unterseite durch stark unterschiedliche Kristallitbildung aus. Die dadurch bedingten inneren Spannungen führen zwangsläufig zu starken Verwerfungen.When reworking the process described in DE-A-2 731 121, it is also found that the softening or melting of the surface to be printed in the molded body, when the temperature is appropriately high, results in thermal stresses (stress peaks) which are so great that printing on relatively thin-walled, e.g. B. web-shaped objects, in particular ski pads, is not possible. In the area of the boundary line between the softened or melted print side and the underside, which is still in a solid state, there is an extreme drop in voltage, which leads to warping of the printed covering when it cools down. When the printed covering cools down, the softened or melted printed side and the underside, which is still in the solid state, are distinguished by strongly different crystallite formation. The resulting internal tensions inevitably lead to strong distortions.

Neben den geschilderten Verwerfungsproblemen bei einem « formfreien » Bedrucken dünnwandiger Gegenstände tritt beim Bedrucken derartiger Gegenstände unter Verwendung dünner Papierdruckträger, wie sie bei der Textilbedruckung verwendet werden, noch das Problem auf, daß dieser Papierdruckträger bei Anpresszeiten von 5 und mehr Sekunden teilweise unlösbar mit dem aufgeschmolzenen Kunststoff verschmilzt bzw. an der zu bedruckenden Seite festklebt. Die bedruckte Oberfläche ist dann im wesentlichen unbrauchbar.In addition to the described warping problems with «form-free» printing of thin-walled objects, when printing such objects using thin paper printing supports, such as are used in textile printing, there is also the problem that this printing paper support is partially insoluble with the melted-on material when the printing time is 5 or more seconds Plastic melts or sticks to the side to be printed. The printed surface is then essentially unusable.

Aus der US-A-1 825 342 ist ein Verfahren zum Bedrucken von bahnförmigen Gegenständen mit « thermoplastischen Komponenten". vornehmlich halbsynthetischen Textilien bekannt. Die Bedruckung derartiger Gegenstände mittels Thermo-Umdruck stellt keine allzu großen Schwierigkeiten dar, wie auch in der erwähnten DE-A-2731 121 ausgeführt ist. Konkret schlägt die US-A-1 825 342 vor, zunächst die gewünschte Farbe in Wachs, vorzugsweise Bienenwachs, zu lösen, um dann das Wachs-Farb-Geschmisch auf einen Druckträger aus Papier, Stoff oder dergleichen aufzutragen. Die zu bedruckende halbsynthetische Gewebebahn soll vor der Bedruckung mit einem geeigneten Lösungsmittel behandelt bzw. benetzt werden, das die Farbstoffe im Farbübertragungsbereich (Walzenspalt, durch den die Gewebebahn sowie der Druckträger kontinuierlich hindurchgeführt werden) herauslöst. Die Bedruckung der Gewebebahn wird also vornehmlich durch das erwähnte Lösungsmittel bewirkt, mit dem die zu bedruckende Bahn behandelt ist, wobei die Farbübertragung bei nur geringfügig erhöhter Temperatur (50-60 °C) erfolgt. Die aus dem Wachs herausgelösten Farbstoffe werden demnach « kalt auf die Gewebebahn aufgetragen, vorzugsweise bei gleichzeitiger Prägung der Gewebebahn.From US-A-1 825 342 a method for printing web-shaped objects with "thermoplastic components". Primarily semi-synthetic textiles is known. Printing such objects by means of thermal transfer printing does not present any great difficulties, as also in the mentioned DE- A-2731 121. Specifically, US-A-1 825 342 suggests first dissolving the desired color in wax, preferably beeswax, in order to then apply the wax-color mixture to a printing medium made of paper, fabric or the like The semi-synthetic fabric web to be printed should be printed with a suitable solvent before printing treated or wetted, which releases the dyes in the ink transfer area (roller gap through which the fabric web and the printing medium are continuously passed). The printing on the fabric web is therefore primarily effected by the solvent mentioned, with which the web to be printed is treated, the ink transfer taking place at only a slightly elevated temperature (50-60 ° C.). The dyes released from the wax are therefore coldly applied to the fabric web, preferably with simultaneous embossing of the fabric web.

Aus der FR-A-2 318 742 ist schließlich noch ein Verfahren zum gleichzeitigen Bedrucken und Prägen von Geweben durch Sublimationstransfer bekannt, wobei die Bedruckung bei Temperaturen von 170 bis 230 °C stattfindet. Vorrichtungsbedingt ist bei dem bekannten Verfahren die Farbübertragungszeit relativ lang. Sie erfolgt bei relativ geringem Druck nahezu über den gesamten Umfang einer Abdruckwalze, über die das zu bedruckende Gewebe sowie ein Druckträger geführt sind. Die Farbübertragung ist also nicht auf einen schmalen Walzenspalt konzentriert.Finally, from FR-A-2 318 742 a method for simultaneous printing and embossing of fabrics by sublimation transfer is known, the printing taking place at temperatures of 170 to 230 ° C. Due to the device, the color transfer time is relatively long in the known method. It takes place at relatively low pressure almost over the entire circumference of an impression roller, over which the fabric to be printed and a print carrier are guided. The ink transfer is therefore not concentrated on a narrow nip.

Der vorliegenden Erfindung liegt nun die Aufgabe zugrunde, ein Verfahren und eine Vorrichtung der eingangs genannten Art so weiterzubilden, daß konturenscharfe, verzerrungsfreie Brillantdrucke erhalten werden und Verwerfungsprobleme sowie Schwierigkeiten beim Abziehen eines Papierdruckträgers von dem bedruckten Belag vermieden sind.The present invention is based on the object of developing a method and a device of the type mentioned in such a way that sharp, distortion-free brilliant prints are obtained and warpage problems and difficulties in removing a paper print carrier from the printed covering are avoided.

Es ist ferner Aufgabe der vorliegenden Erfindung, gefärbte oder bedruckte bahnförmige Gegenstände, insbesondere Skibeläge, aus einem Thermoplast zu schaffen, deren Drucke verzerrungsfrei sind und sich durch gute Fixierung der Druckfarbe auszeichnen und die sich ferner einwandfrei und dauerhaft an ihrer Druckseite mit einem Skikörper oder dergleichen verkleben lassen.It is also an object of the present invention to create colored or printed web-shaped objects, in particular ski coverings, from a thermoplastic, the prints of which are distortion-free and are distinguished by good fixation of the printing ink and which are furthermore flawlessly and permanently on their printed side with a ski body or the like let glue.

Verfahrensmäßig wird die gestellte Aufgabe durch die kennzeichnenden Merkmale des Anspruches 1, vorrichtungsmäßig durch die kennzeichnenden Merkmal der Ansprüche 24 und 31 und hinsichtlich des Erzeugnisses durch die kennzeichnenden Merkmale des Anspruches 23 gelöst.In terms of method, the stated object is achieved by the characterizing features of claim 1, in terms of the device by the characterizing features of claims 24 and 31 and with regard to the product by the characterizing features of claim 23.

Erfindungsgemäß befindet sich der zu bedruckende bahnförmige Gegenstand durch und durch im Schmelzezustand, so daß bei der Abkühlung eine gleichmäßige Kristallitbildung über den Querschnitt erfolgt. Innere thermische Spannungen können bei der erfindungsgemäßen Lösung nicht auftreten.According to the invention, the sheet-like object to be printed is thoroughly in the melt state, so that a uniform crystallite formation takes place over the cross section during cooling. Internal thermal stresses cannot occur in the solution according to the invention.

Ferner ist bei der Erfindung auch ganz wesentlich das kontinuierliche In-Anlage-Bringen der heißen Folie bzw. Schmelzefahne und des Druckträgers kurzzeitig während etwa einer Sekunde, entlang des schmalen Flächenstreifens, wodurch ein Ankleben des Druckträgers selbst bei hohen Anpressdrucken vermieden wird, die eine gute Penetration der Farbstoffe in den bahnförmigen Gegenstand bzw. die Folie gewährleisten. Die Farbstoffe werden in den bahnförmigen Gegenstand regelrecht « eingeschossen ». Die Bedeutung der kurzzeitigen Farbübertragung für den Erhalt konturenscharfer, verzerrungsfreier, d. h. migrationsfreier, Brillantdrucke wurde bisher nicht erkannt. Entweder wurden konstruktionsbedingt lange Farbübertragungszeiten in Kauf genommen, wie z. B. bei der Lösung nach der DE-A-2 632 368, oder es wurde auf entsprechende Hinweise verzichtet, wie z. B. in der US-A-4 059 471, in der - abgesehen von dem darin beschriebenen anderen Bedruckungsverfahren - jegliche Aussage über die Walzengeschwindigkeit und damit Kontaktzeit zwischen Druckträger und dem zu bedruckenden bahnförmigen Gegenstand fehlt.Furthermore, in the invention it is also very important to continuously bring the hot foil or melt vane and the print carrier into contact for a short time for about one second along the narrow area strip, thereby avoiding sticking of the print carrier even at high contact pressures, which is good Ensure penetration of the dyes into the sheet-like object or the film. The dyes are literally “shot” into the sheet-like object. The importance of short-term color transfer for the preservation of sharp contours, distortion-free, d. H. Migration-free, brilliant prints have not yet been recognized. Either construction-related long ink transfer times were accepted, such as B. in the solution according to DE-A-2 632 368, or there was no corresponding information, such as. B. in US-A-4 059 471, in which - apart from the other printing method described therein - any information about the roller speed and thus contact time between the print carrier and the web-like object to be printed is missing.

Versuche haben gezeigt, daß recht gute Druckqualitäten beim Bedrucken einer Mischung von höchst - mit hoch molekularem Polyäthylen' (Mol-Gewicht 6-105 bzw. 2,5-106) erhalten werden. Die Druckfarbe ist an den bedruckten' Stellen unter Bildung konturenscharfer Druckbilder eindiffundiert, so daß eine Beeinträchtigung der Klebverbindung zwischen der bedruckten Seite des Belages und z. B. der Unterseite oder Oberseite eines Skikörpers durch die Druckfarbe nicht stattfindet.Experiments have shown that very good printing qualities are obtained when printing a mixture of extremely high-molecular polyethylene '(mol weight 6-10 5 or 2.5-106). The printing ink is diffused into the printed 'locations to form sharp-edged print images, so that the adhesive connection between the printed side of the covering and e.g. B. the bottom or top of a ski body does not take place due to the printing ink.

Vorzugsweise erfolgt in einer zweiten längerzeitigen Verfahrensstufe von ca. 10-15 Sekunden eine temperaturgesteuerte Abkühlung der bedruckten Folie. Durch diese Maßnahme wird eine gleichmäßige Kristallisation über die gesamte Dicke der bedruckten Folie gefördert. Die thermo-gesteuerte Abkühlung verhindert insbesondere den Einschluß von thermischen Spannungsnestern, die sich z. B. bei einer zu schnellen Abkühlung bilden könnten.A temperature-controlled cooling of the printed film is preferably carried out in a second long-term process stage of approximately 10-15 seconds. This measure promotes uniform crystallization over the entire thickness of the printed film. The thermo-controlled cooling in particular prevents the inclusion of thermal voltage nests, which, for. B. could form with too rapid cooling.

Die Erfindung vermeidet überraschenderweise grundsätzlich eine Vorbehandlung der zu bedruckenden Gegenstände, um überhaupt das Bedrucken zu ermöglichen, wie es bisher zum Bedrucken von Kunststoff bereits für sich bekannt geworden ist, z. B. als Einwirkung elektrischer Entladung, chemischer Wirkstoffe (z. B. durch Ätzen) oder dergleichen :

  • Z. B. müssen bei einem bekannten Verfahren zum Anfärben, Bedrucken und Bemalen von Formkörpern aus Polyolefinen oder Mischpolymerisaten aus Olefinen (vgl. DE-A-1 153 658) ganz spezielle Farbstoffe auf die Formkörper aufgebracht und nach dem An- bzw. Eintrocknen der Farbstoffe auf den Formkörpern letztere auf eine unter dem Kristallitschmelzpunkt des Polymeren liegende Temperatur erwärmt werden, die nach den Ausführungsbeispielen über 100 °C beträgt und während 3-10 Minuten einwirkt. Die Verwendung spezieller Farbstoffe und die beschriebene Verfahrensweise sollen ein zu starkes « Ausblühen, Wandern und Verlaufen (bluten) » verhindern.
Surprisingly, the invention fundamentally avoids pretreatment of the objects to be printed, in order to enable printing at all, as has hitherto become known for printing plastic, e.g. B. as the effect of electrical discharge, chemical agents (e.g. by etching) or the like:
  • For example, in a known process for dyeing, printing and painting moldings made from polyolefins or copolymers made from olefins (cf. DE-A-1 153 658), very special dyes have to be applied to the moldings and after the dyes have dried or dried on Molded bodies are heated to a temperature below the crystallite melting point of the polymer, which according to the exemplary embodiments is above 100 ° C. and acts for 3-10 minutes. The use of special dyes and the procedure described are intended to prevent excessive "blooming, migration and bleeding (bleeding)".

Als besonders förderlich für den Erhalt konturenscharfer, verzerrungsfreier Druckbilder hat sich die Maßnahme nach dem Anspruch 13 herausgestellt, durch die eine ggf. sonst noch geringfügige vorhandene Rotation der Schmelze in der Stauzone im Walzenspalt (insbesondere bei größerem Unterschied der beiden Walzen) vermieden wird. Es wird eine Relativbewegung Null zwischen Farbstoff- und Schmelze-Elementen gewährleistet.The measure according to claim 13 has proven to be particularly conducive to the preservation of sharp, distortion-free printed images, as a result of which a rotation of the melt, which may otherwise be minor, is present the accumulation zone in the nip (especially when there is a major difference between the two rollers) is avoided. A zero relative movement between the dye and melt elements is ensured.

Die Maßnahmen nach den Ansprüchen 15, 16 und 28 sind besonders vorteilhaft, um ein Abreißen, Verziehen oder Zerknittern des Druckträgers bei dessen Durchgang durch die Schmelze-Stauzone zu vermeiden.The measures according to claims 15, 16 and 28 are particularly advantageous in order to avoid tearing, warping or crumpling of the print carrier as it passes through the melt accumulation zone.

Durch die Lehre nach dem Anspruch 21 wird die Farbstärke der Bedruckung (Farbkraft) weiter erhöht bzw. ein besserer Farbkontrast erzielt. Zusätzlich ermöglicht dieses Aufkaschieren bzw. Verkleben einen geringfügigen Übertritt von Druckfarbe aus dem Belag (Folie) in den Kleber und/oder die Verstärkungsmateriallage, was das Druckbild im fertigen Verbund-Bauteil noch tiefer « fixiert».Through the teaching according to claim 21, the color strength of the printing (color strength) is further increased or a better color contrast is achieved. In addition, this lamination or gluing enables a slight transfer of printing ink from the covering (film) into the adhesive and / or the reinforcing material layer, which "fixes" the printed image even more deeply in the finished composite component.

Die Maßnahmen nach dem Anspruch 31 gestatten, bereits hergestellte (kalte) bahnförmige Gegenstände bzw. Folien nachträglich zu bedrucken, wobei zweckmäßigerweise die beheizten Anpressrollen gleichzeitig zum In-Anlage-Halten der Folie und des Druckträgers sowie zum Tempern der Folie dienen.The measures according to claim 31 permit the already printed (cold) sheet-like objects or foils to be subsequently printed, the heated pressure rollers advantageously serving at the same time for holding the foil and the printing medium in contact and for tempering the foil.

An Hand der Zeichnung wird die Erfindung beispielsweise näher erläutert. Es zeigen :

  • Figur 1 Schematisch ein erstes Ausführungsbeispiel einer Vorrichtung zur Durchführung des erfindungsgemäßen Verfahrens ;
  • Figur 2 einen Auschnitt von Figur 1 mit einschlägigen Diagrammen und Parametern zur Erläuterung des erfindungsgemäßen Verfahrens ;
  • Figur 3 die Einzelheit einer Abwandlung der Vorrichtung von Figur 1 ;
  • Figur 4 eine weitere Abwandlung der Vorrichtung von Fig. 1 ;
  • Figur 5 eine dritte Abwandlung der Vorrichtung von Fig. 1 ; und
  • Figur ein grundlegend anderes Ausführungsbeispiel der erfindungsgemässen Vorrichtung.
The invention is explained in more detail, for example, with reference to the drawing. Show it :
  • Figure 1 shows schematically a first embodiment of an apparatus for performing the method according to the invention;
  • FIG. 2 shows a section of FIG. 1 with relevant diagrams and parameters for explaining the method according to the invention;
  • Figure 3 shows the detail of a modification of the device of Figure 1;
  • Figure 4 shows a further modification of the device of Fig. 1;
  • Figure 5 shows a third modification of the device of Fig. 1; and
  • Figure shows a fundamentally different embodiment of the device according to the invention.

Figur 1Figure 1

Aus dem Extrusions-Werkzeug 1 tritt eine Folie 2 thermoplastischen Kunststoffs in Form einer Schmelzefahne aus. Ein Hilfs-Druckträger 3 wird von einer Vorrats-Rolle 4 abgewickelt und von einer Förder-Walze 5 zu einem mit einer beheizten Walze 6 gebildeten Walzenspalt gefördert, in dem sie mit der Folie 2 in Form einer Schmelzefahne in Anlage gebracht wird. Der Walzenspalt ist so bemessen (vgl. dazu genauer Fig. 2), dass sich eine keilförmige Stauzone 2a ausbildet, wie deutlich aus Fig. 1 ersichtlich ist. In der Stauzone 2a findet das In-Anlage-Bringen statt, das bereits in der Einleitung ausführlich beschrieben ist.A film 2 of thermoplastic material emerges from the extrusion tool 1 in the form of a melt plume. An auxiliary printing medium 3 is unwound from a supply roll 4 and conveyed by a conveyor roller 5 to a nip formed by a heated roller 6, in which it is brought into contact with the film 2 in the form of a melt plume. The roller gap is dimensioned (cf. more precisely in FIG. 2) that a wedge-shaped accumulation zone 2a is formed, as can be clearly seen from FIG. 1. The system installation takes place in the storage zone 2a, which is already described in detail in the introduction.

Nach Austritt der Folie 2 mit dem Hilfs-Druckträger 3 aus dem Walzenspalt zwischen den beiden Walzen 5 und 6 schliesst sich unmittelbar eine zweite Stufe an, die ebenfalls bereits ausführlich erläutert worden ist, indem die Folie 2 und der Hilfs-Druckträger 3 gemeinsam über einen grösseren Winkel des Umfangs der Walze 6 laufen, und zwar an einer Temper-Einrichtung 7 mit gesteuerter Abnahme der Temperatur ab dem Walzenspalt in Förderrichtung vorbei, bis über eine Umlenk-Walze 8 der Hilfs-Druckträger druckbild-erschöpft von der bedruckten Folie 2' zu einer Aufwickel-Rolle 9 abgeführt wird.After the film 2 with the auxiliary printing medium 3 has emerged from the nip between the two rollers 5 and 6, a second stage immediately follows, which has also already been explained in detail, in that the film 2 and the auxiliary printing medium 3 together over one Larger angles of the circumference of the roller 6 run past a tempering device 7 with controlled decrease in temperature from the nip in the conveying direction until the auxiliary printing medium is exhausted from the printed film 2 'via a deflection roller 8 a take-up roll 9 is removed.

Die bedruckte Folie 2' läuft dann vorzugsweise an einer Nachbehandlungs-Einrichtung 12 vorbei, die mittels einer Hochfrequenz-Corona-Entladung oder anoxidierenden Beflammung einwirkt. Anschliessend wird die bedruckte Folie 2' über eine Umlenk-Walze 10 auf eine Aufwickel-Rolle 11 aufgewickelt, um später weiterverarbeitet werden zu können.The printed film 2 'then preferably runs past an aftertreatment device 12, which acts by means of a high-frequency corona discharge or an oxidizing flame. The printed film 2 'is then wound onto a take-up roll 11 via a deflection roller 10 in order to be able to be further processed later.

Obwohl die Walzen 5, 6 mit im wesentlichen gleichem Durchmesser dargestellt sind, versteht es sich, dass ihr Durchmesser durchaus unterschiedlich sein kann, z. B. die Walze 5 einen beträchtlich kleineren Durchmesser als die Walze 6 besitzen kann.Although the rollers 5, 6 are shown with essentially the same diameter, it goes without saying that their diameter can be quite different, e.g. B. the roller 5 can have a considerably smaller diameter than the roller 6.

Die nur schematisch angedeutete Temper-Einrichtung 7 kann z. B. durch einen Kühlluftstrom-Kanal gebildet sein, wobei die Kühlluft an dem mit einem Pfeil versehenen Ende zugeführt wird.The only schematically indicated tempering device 7 can, for. B. be formed by a cooling air flow channel, wherein the cooling air is supplied at the arrowed end.

Die Nachbehandlungs-Einrichtung 12 hat einen grundsätzlich für sich bekannten Aufbau.The aftertreatment device 12 has a structure which is known per se.

Im Ausführungsbeispiel von Fig. 1 ist der Druckträger ein sogenannter Hilfs-Druckträger 3, indem er nach der Abgabe seines Druckbilds an die zu bedruckende Folie.2 von dieser wieder ausser Anlage gebracht wird, nämlich über die Umlenk-Walze auf die Aufwickel-Rolle gewickelt wird, wie bereits erläutert wurde. Es ist aber auch denkbar, dass zusätzlich der Druckträger 3 mit der Folie 2 eine dauernde Verbindung eingeht, wenn z. B. der Druckträger weitere Funktionen erfüllen soll. In diesem Fall würden die Umlenk-Walze und die Aufwickel-Rolle 9 in Fig. 1 wegfallen.In the exemplary embodiment of FIG. 1, the print carrier is a so-called auxiliary print carrier 3, in that after the delivery of its print image to the film 2 to be printed, it is brought out of contact again, namely wound onto the take-up roll via the deflection roller as already explained. But it is also conceivable that the print carrier 3 with the film 2 enters into a permanent connection if, for. B. the print carrier should perform other functions. In this case, the deflection roller and the take-up roller 9 would be omitted in FIG. 1.

Figur 2Figure 2

Ein bevorzugtes Ausführungsbeispiel der Erfindung für eine zu bedruckende Polyäthylen-Folie ist in Fig. 2 genauer dargestellt, auf deren Einzelheiten unmittelbar verwiesen wird.A preferred embodiment of the invention for a polyethylene film to be printed is shown in more detail in Fig. 2, to the details of which reference is made directly.

Die in Fig. 2 verwandten Symbole bedeuten :

  • - f = Öffnungsweite des Extrusions-Werkzeugs 1,
  • - s = Weite des Walzenspalts (an der engsten Stelle) zwischen den Walzen 5 und 6,
  • - I = Länge des Walzenspalts zwischen den Walzen 5 und 6,
  • - d = Dicke der Folie 2.
The symbols used in FIG. 2 mean:
  • - f = opening width of the extrusion tool 1,
  • - s = width of the nip (at the narrowest point) between rollers 5 and 6,
  • - I = length of the nip between rollers 5 and 6,
  • - d = thickness of the film 2.

Ausweislich Fig. ist die Walzenspalt-Länge I genaugenommen als Länge der Stauzone 2a zu verstehen, und zwar zwischen einerseits dem in Förderrichtung (vgl. den Pfeil) ersten Auftreffen der Folie 2 auf den Umfang der Walzen 5 und 6 und andererseits der engsten, der Walzenspaltweite s entsprechenden Stelle des Walzenspalts (vgl. Fig. 2 die beiden Strichlinien, die den DoppelPfeil 1 begrenzen).As can be seen in FIG. 1, the nip length I is strictly to be understood as the length of the accumulation zone 2a, specifically between the first impact of the film 2 on the circumference of the rollers 5 and 6 in the conveying direction (cf. the arrow) and the narrowest one Nip width s corresponding point of the nip (see Fig. 2, the two broken lines that delimit the double arrow 1).

Dabei bestehen folgende Beziehungen zwischen den einzelnen Grössen :

Figure imgb0001
Figure imgb0002
Figure imgb0003
 The following relationships exist between the individual sizes:
Figure imgb0001
Figure imgb0002
Figure imgb0003

P bezeichnet den Linien-Druck über den Umfang der Walzen 5 und 6.P denotes the line pressure over the circumference of the rollers 5 and 6.

Die Temperaturverteilung der Folie 2 über den Umfang der Walze 6 ist aus dem entsprechenden Diagramm « Folien-Temperatur in Fig. 2 ersichtlich. Diese Temperaturverteilung ist dadurch bedingt, dass die Folie 2, die ohnehin mit einer hohen Temperatur aus dem Extrusions-Werkzeug 1 austritt, und zwar mit ca. 225°C für hochmolekulares Polyäthylen, sich dann trotz der Wärmezufuhr von den Walzen 5 und 6, die (z. B. mittels Ölumlaufheizung) auf Temperaturen von z. B. ca. 70 °C bzw. ca. 110°C aufgeheizt sind, beim Verlassen des Walzenspalts abkühlt.The temperature distribution of the film 2 over the circumference of the roller 6 can be seen from the corresponding diagram “film temperature in FIG. 2. This temperature distribution is due to the fact that the film 2, which exits the extrusion die 1 at a high temperature anyway, namely at approximately 225 ° C. for high molecular weight polyethylene, then, despite the heat supply from the rollers 5 and 6, the (e.g. by means of oil circulation heating) to temperatures of e.g. B. are heated to about 70 ° C or about 110 ° C, cools when leaving the nip.

Aus Fig. ist ersichtlich, dass das erste In-Anlage-Bringen in dem Walzenspalt-Bereich stattfindet, wie er sich aus den Umfangs-Bögen von 15° und 10° (vgl. die graphische Darstellung innerhalb der Walze 5) zusammensetzt, da dort der erforderliche hohe Druck (genauer: Linien-Druck P wegen des erfindungsgemässen In-Anlage-Bringens der Folie 2 und des Druckträgers 3 in einer streifenförmigen, d. h. im wesentlichen linearen, Zone) und auch die erforderliche hohe Temperatur (vgl. auch die Folien-Temperatur-Kurve innerhalb der Walze 6 mit hohen Werten im Umfangs-Bogen von 0-15° nach der engsten Stelle des Wälzenspalts) herrschen.From Fig. It can be seen that the first installation takes place in the nip area, as it is composed of the circumferential arcs of 15 ° and 10 ° (cf. the graphic representation within the roller 5), because there the required high pressure (more precisely: line pressure P due to the fact that the film 2 and the printing medium 3 are brought into contact according to the invention in a strip-shaped, ie essentially linear, zone) and also the required high temperature (cf. also the film Temperature curve inside the roller 6 with high values in the circumferential arc of 0-15 ° after the narrowest point of the roller gap) prevail.

Danach ist die Druckeinstellung unkritisch.After that, the pressure setting is not critical.

Für die Einstellung der Temperatur-Verteilung der Folie 2 in der zweiten Stufe des In-Anlage-Bringens derart, dass die Folie mit dem aufgedruckten Druckbild bei ihrer Abkühlung so temperaturgesteuert vom thermoelastischen in den festen Zustand übergeht, dass sie sich nicht verwirft und das Druckbild nicht verzerrt wird, empfiehlt sich die Verwendung der Temper-Einrichtung 7, die z. B. durch einen Warmluftstrom-Kanal oder durch Infrarot-Strahler gebildet sein kann.For setting the temperature distribution of the film 2 in the second stage of bringing it into such a way that the film with the printed image changes from the thermoelastic to the solid state when it cools down in such a temperature-controlled manner that it does not warp and the printed image is not distorted, it is recommended to use the tempering device 7, the z. B. can be formed by a hot air flow channel or by infrared radiators.

Die Drehzahlen bzw. Umfangsgeschwindigkeiten der beiden Walzen 5 und 6 sollten so eingestellt werden, dass eine Null-Relativgeschwindigkeit zwischen der Folie 2 und dem Druckträger3 und damit ein sauberer Druck erzielt wird.The speeds or peripheral speeds of the two rollers 5 and 6 should be set so that a zero relative speed between the film 2 and the print carrier 3 and thus a clean print is achieved.

Figur 3Figure 3

Hier ist die Anordnung des Extrusions-Werkzeugs 1 mit seiner Öffnung relativ zum Walzenspalt zwischen den Walzen 5 und 6 so getroffen, dass der Einlaufwinkel der Folie 2 ca. 10-15° zur Walzenspalt-Mittelachse, und zwar zur Förder- Walze 5 des Hilfs-Druckträgers 3 hin, beträgt.Here, the arrangement of the extrusion tool 1 with its opening relative to the nip between the rollers 5 and 6 is such that the inlet angle of the film 2 is approximately 10-15 ° to the nip central axis, specifically to the conveyor roller 5 of the auxiliary -Print carrier 3 out, is.

Figur4Figure 4

In diesem Ausführungsbeispiel sind zusätzlich gegenüber dem Ausführungsbeispiel von Fig. 1 vorgesehen :

  • - zur Zugspannungsregelung eine Scheiben- bzw. Band-Bremse für sich bekannten Aufbaus mit einer Welle 13, einer Scheibe 14 und BremsBacken 15 sowie ein Reibbeiag 5a auf der Förderwalze 5 des Druckträgers 3 und
  • - eine Vorheiz-Einrichtung 16 zum Erwärmen des Druckträgers 3 auf ca. 50-70 °C.
In this exemplary embodiment, in addition to the exemplary embodiment of FIG. 1, the following are also provided:
  • - For tension control, a disc or band brake for a known construction with a shaft 13, a disc 14 and brake shoes 15 and a friction factor 5a on the conveyor roller 5 of the pressure carrier 3 and
  • - A preheating device 16 for heating the print medium 3 to about 50-70 ° C.

Auch hier darf wegen der besonderen Vorteile des Ausführungsbeispiel von Fig. 4 auf die Einleitung verwiesen werden.Here, too, reference may be made to the introduction because of the particular advantages of the exemplary embodiment in FIG. 4.

Figur 5Figure 5

Hier ist zum besseren In-Anlage-Bringen bzw. -Halten der Folie 2 und des Druckträgers 3 in der zweiten Stufe des erfindungsgemässen Verfahrens eine Anpress-Einrichtung vorgesehen, die durch Anpress-Rollen 17 gebildet ist, denen eine Temper-Einrichtung in Form eines Warmluftstrom-Kanals 18 zugeordnet ist, so dass sich die in Bezug auf verschiedene Anpress-Rollen 17 angedeutete Temperatur-Abnahme in Förderrichtung ergibt.In order to better bring or hold the film 2 and the pressure carrier 3 in the second stage of the method according to the invention, a pressing device is provided, which is formed by pressing rollers 17, to which a tempering device in the form of a Warm air flow channel 18 is assigned, so that the temperature decrease indicated in relation to different pressure rollers 17 results in the conveying direction.

Figur 6Figure 6

Hier ist ein im Vergleich zu Fig. 1 grundsätzlich anderes Ausführungsbeispiel gezeigt, indem nämlich die Folie 22 nicht aus einem Extrusions-Werkzeug zugeführt, sondern im zunächst kalten Zustand von einer Vorrats-Rolle 21a abgewickelt wird und dann über eine Umlenk-Walze 24a zu einer Vorheiz-Walze 26 gelangt, wo sie auf über den Kristallitschmelzpunkt ihres Materials erwärmt wird, und schliesslich an einer weiteren Umlenk-Walze 27 vorbei in den von zwei Kalander-walzen 35, 36 gebildeten Walzenspalt eintritt, dem gleichzeitig ein Druckträger 23 zugeführt wird, der vorher von einer Vorrats-Rolle 21 b über eine Umlenk-Walze24b und eine Vorheiz-Walze 25, die auf ca. 50-70 °C vorwärmt, abgewickelt worden ist.Here, an embodiment which is fundamentally different from FIG. 1 is shown, namely that the film 22 is not fed from an extrusion tool, but is unwound from a supply roll 21a in the initially cold state and then via a deflection roller 24a to one Preheat roller 26 arrives, where it is heated to above the crystallite melting point of its material, and finally passes another deflection roller 27 into the nip formed by two calender rollers 35, 36, to which a pressure carrier 23 is simultaneously fed, which previously from a supply roll 21 b via a deflecting roller 24b and a preheating roller 25, which preheats to about 50-70 ° C, has been unwound.

Im von den beiden Kalander-Walzen 35 und 36 gebildeten Spalt findet das erste In-Anlage-Bringen zwischen Folie und Druckträger statt.In the nip formed by the two calender rolls 35 and 36, the first contact between the film and the print carrier takes place.

Anschliessend durchlaufen Folie und Druckträger eine zweite Anpress-Einrichtung 37, wobei vorteilhafterweise die Temperung durch die Anpress-Rollen 37a und 37b selbst erfolgt, indem diese entsprechend beheizt werden, und die in Fig.6 6 linken Anpress-Rollen eine niedrigere Temperatur haben als die rechten.Subsequently, the film and the print carrier pass through a second pressing device 37, the heat treatment advantageously being carried out by the pressing rollers 37a and 37b themselves, by heating them accordingly, and the pressing rollers on the left in FIG. 6 have a lower temperature than that right.

Von der bedruckten Folie 22' wird der druckbilderschöpfte Druckträger 23 über eine Umlenk-Walze 38 auf eine Aufwickel-Rolle 39 aufgewickelt, wogegen die bedruckte Folie 22' über Umlenk-Walzen 40 und 40a auf eine Aufwickel-Rolle 41 aufgewickelt wird.From the printed film 22 ', the print carrier 23 exhausted from the printed image is wound onto a winding roll 39 via a deflection roller 38, whereas the printed film 22' is wound onto a winding roll 41 via deflection rollers 40 and 40a.

Mit diesem Ausführungsbeispiel ist es möglich, bereits früher hergestellte Folie nachträglich zu bedrucken.With this embodiment, it is possible to subsequently add film that has already been produced print.

Hinsichtlich der Ausbildung des Walzenspalts zwischen den beiden Kalander-Walzen 35 und 36 gelten vorzugsweise ähnliche Überlegungen wie im Zusammenhang mit der obigen Fig. 2, nur dass hier an die Stelle der Extrusions-Werkzeug-Öffnungsweite f die Folien-Dicke d tritt.With regard to the formation of the nip between the two calender rolls 35 and 36, similar considerations apply as in connection with the above FIG. 2, only that here the film thickness d takes the place of the extrusion die opening width f.

Zur Durchführung des erfindungsgemässen Verfahrens ist auch der Einsatz einer grundsätzlich für sich bekanntgewordenen DoppelbandPresse (z. B. der Fa. Sandvik) möglich, die eine kombinierte Anpress-Wärmebehandlungs-Einrichtung aufweist, sofern in deren in Förderrichtung erstem Abschnitt besonders hohe Werte von Anpress-Druck und Temperatur eingestellt werden, um dort die erste Stufe des In-Anlage-Bringens von Folie und Druckträger des erfindungsgemässen Verfahrens durchzuführen.To carry out the method according to the invention, it is also possible to use a double belt press which has become known per se (e.g. from Sandvik) and which has a combined contact pressure heat treatment device, provided that particularly high values of contact pressure in the first section in the conveying direction Pressure and temperature are set in order to carry out the first stage of bringing the film and pressure carrier of the method according to the invention into place there.

Ausserdem kann die Walze 6 bzw. die KalanderWalze 36 mit einem Präge-Profil versehen werden, um gleichzeitig mit dem Bedrucken der Folie 3 bzw. 22 auch ein Prägen der später als Belag dienenden Folie vorzunehmen, wenn z. B. der Belag mit Steighilfen (z. B. Schuppen) für den Ski-Langlauf versehen werden soll.In addition, the roller 6 or the calender roller 36 can be provided with an embossing profile, in order to simultaneously emboss the foil 3 or 22, which will later serve as a covering, when printing on the foil, for example when B. the surface should be provided with climbing aids (e.g. shed) for cross-country skiing.

Claims (31)

1. Method for colouring or printing web-like objects (2, 22), in particular ski coverings, consisting of thermoplastic materials, in which by a continuously moving printing carrier (3, 23), on which a printed image consisting of first of all sublimable and then diffusable colouring matter is applied, the ink is transferred under the action of heat and pressure solely along substantially one narrow surface strip at right angles to the common conveying direction of the covering (2, 22) and of the printing carrier (3, 23) to the covering (2, 22) moving continuously in the same manner, characterised in that the covering (2, 22) is brought as a hot foil in a substantially continuous molten state directly without a further intermediate layer into contact with the printing carrier (3, 23) and that the transfer of ink to the foil takes place for a short time for approximately one second.
2. Method according to claim 1, characterised in that in a second longer stage of the method of approximately ten to fifteen seconds, temperature-controlled cooling of the printed foil takes place.
3. Method according to claim 1 or 2, characterised in that the brief contact for the transfer of ink takes place in a gap converging in the conveying direction, which together with the conveying speed of the foil and of the printing carrier has dimensions such that a substantially wedge-shaped as well as rotation-free accumulation area of molten foil forms.
4. Method according to one of claims 1 to 3, in which the foil to be printed is extruded, characterised in that directly after the extrusion, colouring or printing is carried out.
5. Method according to one of claims 1 to 3, characterised in that a cold foil is reheated and printed.
6. Method according to one of claims 1 to 5, characterised in that printing is carried out on a covering of olefin, in particular high pressure or low pressure polyethylene.
7. Method according to one of the preceding claims, characterised in that known non-fading colouring agents are used as the colouring agents.
8. Method according to one of claims 1 to 7, characterised in that a printed paper, metal, preferably aluminium, fleece web or the like is used as the printing carrier.
9. Method according to one of claims 1 to 8, characterised in that during the brief contact for the transfer of ink, the heat acts at a temperature of approximately 180 to 250 °C and the pressure applied in the conveying direction increases sharply spatially.
10. Method according to claims 2 and 9, characterised in that during cooling in the second stage of the method, the temperature drops from approximately 200 to 250 °C to approximately 50 to 90 °C.
11. Method according to claims 3, 4 and 9, characterised in that the molten accumulation area is constructed so that over a length (1) of approximately five times the extrusion tool opening width (f) (or foil ticknessd), the linear pressure (P) increases steeply from approximately 1-60 N/cm.
12. Method according to one of claims 3 to 11, characterised in that the gap converging in the conveying direction, into which the hot foil is introduced, is formed by two rollers, namely a conveying roller for the foil and conveying roller for the printing carrier.
13. Method according to claim 12, characterised in that the hot foil is supplied at an inlet angle of approximately 10 to 15° with respect to the central axis of the roll gap in the direction of the conveying roller for the printing carrier.
14. Method according to claim 12 or 13, characterised in that the conveying roller for the foil is adjusted to a temperature of approximately 110°C and the conveying roller for the printing carrier is adjusted to a temperature of approximately 70 °C.
15. Method according to one of the preceding claims, characterised in that the printing carrier is preheated.
16. Method according to one of the preceding claims, characterised in that the printing carrier is conveyed by conveying means, in particular a roughened roller.
17. Method according to one of the preceding claims, characterised in that the side of the covering located opposite the printed side is embossed during printing, preferably provided with rising aids (for example scales).
18. Method according to one of claims 2 to 17, characterised in that the temperature-controlled cooling of the printed foil is carried out with warm air.
19. Method according to one of the preceding claims, characterised in that the printed foil is treated by :
- high frequency coronal discharge or
- oxidizing.. flaming treatment.
20. Method according to one of claims 1 to 18, characterised in that the printed foil is treated chemically with a primer, for example a substance providing the ability to adhere.
21. Method according to one of the preceding claims, characterised in that the printed foil is laminated by means of a transparent or light coloured adhesive, preferably polyurethane adhesive, on a layer of strengthening material, for example a synthetic material dyed a light colour and strengthened with glass fibres.
22. Method according to claim 21, characterised in that the lamination takes place under the action of heat.
23. Coloured or printed web-like object, in particular a ski covering consisting of a thermoplastic material, characterised in that after a method according to one or more of claims 1 to 22 it is printed and is made from an olefin, in particular polyethylene, preferably from a mixture of polyethylene of maximum and high molecular weight, approximately 6 - 105 or approximately 25.105 molecular weight.
24. Apparatus for colouring or printing web-like objects, in particular ski coverings with a pair of rollers (5, 6) for forming a roll gap, through which the web-like object (2) to be printed and a printing carrier (3) are guided, with driving devices for the two rollers (5, 6) for driving at substantially the same peripheral speed and an extruder (1) for the extrusion of the web-like object, characterised in that for carrying out the method according to one of claims 1 to 22, the extruder (1) is located so close in front of the roll gap that the web-like object arrives in the roll gap still in the continuously molten state (figure 2).
25. Apparatus according to claim 24, characterised in that the roll gap and the mutual peripheral speed of the rollers (5, 6) are chosen so that in the conveying direction in front of the roll gap, a wedge-shaped accumulation area (2a) of the foil (2) emerging from the extruder (1) as a molten web is formed with the following dimensions :
roll gap s = covering (foil) thickness d,
extrusion tool opening width f = (1.0 - 1.2) - roll gap width s,
roll gap length I = (1 ÷. 10) - roll gap width s,

in which case the roll gap length preferably amounts to approximately 0.5 to 3.0 mm.
26. Apparatus according to claim 24 or 25, characterised in that at least the roller (6) conveying the foil (2) is heated.
27. Apparatus according to one of claims 24 to 26, characterised in that the roller (6) conveying the foil (2) is provided with an embossing profile.
28. Apparatus according to one of claims 24 to 27, characterised by a tensile stress regulator (13-15) for the printing carrier (3) and a pre-heating device (16) preceding the conveying roller (5) of the printing carrier (3) in the conveying direction, for heating the printing carrier (3) to approximately 50 to 70 °C.
29. Apparatus according to one of claims 24 to 28, characterised by a tempering device (7) located between the roll gap of the accumulation area (2a) and a guide roller (8) for the delivery of the printing carrier (3), with temperature-controlled cooling from the roll gap in the conveying direction.
30. Apparatus according to one of claims 24 to 28, characterised by a pressure device (pressure rollers 17) located between the roll gap of the accumulation area (2a) and a guide roller (8) for the delivery of the printing carrier (3), for keeping the foil (2) and the printing carrier (3) in contact.
31. Apparatus for colouring or printing web-like objects, in particular ski coverings, with a pair of calender rollers (35, 36) for forming a roll gap, through which the web-like object (22) to be printed and a printing carrier (23) is guided, characterised in that for carrying out the method according to one of claims 1 to 22 located in the conveying direction in front of the calender rollers (35, 36) of the roll gap is a pre-heating roller (25, 26) respectively for the printing carrier (23) for heating it to a temperature of approximately 50 to 70° or for the cold web-like object (22) to be printed, for heating it to above the crystallite melting temperature of its material and the calender rollers (35, 36) are followed by heated pressure rollers (37a, 37b) for keeping the object (22) and the printing carrier (23) in contact before the carrier (23) is discharged and for the simultaneous tempering of the foil (22) (figure 6).
EP80107678A 1980-02-07 1980-12-06 Process and apparatus for colouring or printing web-like items, particularly ski-coverings, and such articles Expired EP0033776B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT80107678T ATE6140T1 (en) 1980-02-07 1980-12-06 METHOD AND DEVICE FOR COLORING OR PRINTING WEB-FORM OBJECTS, IN PARTICULAR SKI COATINGS, AND SUCH OBJECTS.

Applications Claiming Priority (2)

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DE3004518A DE3004518C2 (en) 1980-02-07 1980-02-07 Process for dyeing (printing) ski decking or tread surfaces, as well as surfaces produced therefrom
DE3004518 1980-02-07

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EP0033776A2 EP0033776A2 (en) 1981-08-19
EP0033776A3 EP0033776A3 (en) 1981-11-18
EP0033776B1 true EP0033776B1 (en) 1984-02-08

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EP (1) EP0033776B1 (en)
JP (1) JPS56121789A (en)
AT (1) ATE6140T1 (en)
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CH (1) CH629704A5 (en)
DE (2) DE3004518C2 (en)
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NO810386L (en) 1981-08-10
CH629704A5 (en) 1982-05-14
ATE6140T1 (en) 1984-02-15
CA1201926A (en) 1986-03-18
DE3004518C2 (en) 1987-12-23
DE3066524D1 (en) 1984-03-15
JPS56121789A (en) 1981-09-24
EP0033776A2 (en) 1981-08-19
US4462852A (en) 1984-07-31
EP0033776A3 (en) 1981-11-18
DE3004518A1 (en) 1981-08-13

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