EP0122264B2 - Method for coating back-cloth with a powdery synthetic product - Google Patents

Method for coating back-cloth with a powdery synthetic product Download PDF

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Publication number
EP0122264B2
EP0122264B2 EP83903082A EP83903082A EP0122264B2 EP 0122264 B2 EP0122264 B2 EP 0122264B2 EP 83903082 A EP83903082 A EP 83903082A EP 83903082 A EP83903082 A EP 83903082A EP 0122264 B2 EP0122264 B2 EP 0122264B2
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EP
European Patent Office
Prior art keywords
powder
intermediate carrier
process according
depressions
heat
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EP83903082A
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German (de)
French (fr)
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EP0122264B1 (en
EP0122264A1 (en
Inventor
Josef Schaetti
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Schaetti and Co
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Schaetti and Co
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Priority to AT83903082T priority Critical patent/ATE19964T1/en
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    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06N—WALL, FLOOR, OR LIKE COVERING MATERIALS, e.g. LINOLEUM, OILCLOTH, ARTIFICIAL LEATHER, ROOFING FELT, CONSISTING OF A FIBROUS WEB COATED WITH A LAYER OF MACROMOLECULAR MATERIAL; FLEXIBLE SHEET MATERIAL NOT OTHERWISE PROVIDED FOR
    • D06N7/00—Flexible sheet materials not otherwise provided for, e.g. textile threads, filaments, yarns or tow, glued on macromolecular material
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06N—WALL, FLOOR, OR LIKE COVERING MATERIALS, e.g. LINOLEUM, OILCLOTH, ARTIFICIAL LEATHER, ROOFING FELT, CONSISTING OF A FIBROUS WEB COATED WITH A LAYER OF MACROMOLECULAR MATERIAL; FLEXIBLE SHEET MATERIAL NOT OTHERWISE PROVIDED FOR
    • D06N3/00—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof
    • D06N3/0086—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof characterised by the application technique
    • D06N3/0088—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof characterised by the application technique by directly applying the resin
    • D06N3/0093—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof characterised by the application technique by directly applying the resin by applying resin powders; by sintering
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D1/00—Processes for applying liquids or other fluent materials
    • B05D1/28—Processes for applying liquids or other fluent materials performed by transfer from the surfaces of elements carrying the liquid or other fluent material, e.g. brushes, pads, rollers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D2401/00—Form of the coating product, e.g. solution, water dispersion, powders or the like
    • B05D2401/30—Form of the coating product, e.g. solution, water dispersion, powders or the like the coating being applied in other forms than involving eliminable solvent, diluent or dispersant
    • B05D2401/32—Form of the coating product, e.g. solution, water dispersion, powders or the like the coating being applied in other forms than involving eliminable solvent, diluent or dispersant applied as powders

Definitions

  • Fabric webs with a plastic coating are known.
  • the coating can in principle be done with powder or pastes.
  • the application and distribution of the plastic can directly, i. H. for example, by sprinkling a powder on the textile base or indirectly by means of an intermediate carrier, in the form of an engraved roller or a perforated cylinder.
  • Spreading processes have the natch part that the powder is uneven due to the occurrence of electrostatic forces.
  • a method in which the powder is applied to the textile web by means of an intermediate carrier in the form of an engraved roller has the advantage of a uniform coating while eliminating the disruptive forces of electrostatic charges.
  • the material located in the recesses of the engraved roller must be applied to the fabric using heat.
  • the fabric web must be brought into contact with the engraved roller.
  • the fabric had to be heated to such an extent by upstream heat sources that when the hot fabric touched the powder contained in the recesses of the engraved and cooled roller, it immediately adhered to the fabric.
  • the powder introduced into the depressions of the intermediate carrier, while being conveyed on the intermediate carrier with the application of heat, is passed through the textile support which is guided around the intermediate carrier by more than half the circumference. set in such a sticky state that the powder adheres to the textile base when the textile base is removed from the intermediate carrier.
  • the temperature control actually only depends on the choice of powder used, which may have a higher or lower melting point, the type of textile web to be coated must be taken into account in all previously known coating methods by means of an intermediate carrier, for example an engraved roller.
  • the temperature control depends on how thick the textile web to be coated is, what color it has, what thermal conductivity or radiation permeability it has, what heat capacity it has, and what chemical nature it has.
  • the present invention relates to a method for coating a textile base made of woven or non-woven material made of natural or synthetic fibers, in which a plastic powder is applied via a recessed intermediate carrier at a temperature which prevents the powder from sticking to the intermediate carrier when applying and distributing the same , wherein the powder introduced into the recesses of the intermediate carrier is put into a so sticky state during the conveyance on the intermediate carrier with the application of heat that it is more adherent and is removed from the recesses of the intermediate carrier by contact with the textile base.
  • a method of this kind is known from the above-mentioned FR-A-2 454 334.
  • the heat is supplied directly to the powder lying in the recesses of the intermediate carrier without hindrance through the textile base.
  • the intermediate carrier can be kept at a temperature which is required in accordance with the powder to be used. This can be done by supplying or removing heat using appropriate heating or cooling agents. This depends on the type of heat supply to the powder located in the depressions of the intermediate carrier.
  • the textile web can be placed on the intermediate carrier via a press roller without other mechanical means being disregarded.
  • the heat supply to the powder should advantageously take place from outside the intermediate carrier.
  • the powder to be used and suitable for the method according to the wishes of the user is located in a powder storage container 1.
  • the powder in the storage container 1 is removed from the powder storage container 1 by means of a metering device in accordance with the amount of the recesses provided in an intermediate carrier 5.
  • a possible embodiment of such a metering device can be a metering roller 2. Vibrating screens or rotating brushes can also be considered without other metering devices, as are known in the art, being excluded.
  • a powder curtain falls from the powder metering device into a powder distribution and application space 3, which is delimited at least on one side by a cooled doctor blade 4, but preferably on two sides by cooled doctor blades 4.
  • the two squeegees 4 shown here as a doctor blade 4 are in contact with the surface of the intermediate carrier 5.
  • the cooled squeegee 4 with respect to the direction of movement of the intermediate carrier 5 ensures complete filling the recesses in the intermediate carrier with powder and scrape off the unnecessary amount. With the correct dosage of the powder supply, there is always only a small amount of powder in room 3, which is continuously processed.
  • the intermediate carrier 5, which acts as the conveying surface of the powder can be a so-called engraved roller known in powder coating technology, without this precluding differently designed intermediate carriers 5 as conveying surfaces.
  • the intermediate carrier can be equipped with coolant and / or heating medium in order to bring about a constant temperature of the surface.
  • one or more heat sources 7, 8, 9 can supply heat directly to the powder lying in the depressions in a manner which is matched to the powder.
  • the base to be coated is not in the way here.
  • the regulation of the heat supply therefore only needs to be matched to the powder to be used.
  • the underlay itself is not exposed to these undesirable effects of heat.
  • the heat is supplied without contact, i. H. by means of heat radiation or by means of heat conduction or heat transfer. Combinations of different heat sources are also possible. Depending on this, heating surfaces or rollers, radiant heaters or hot air can be considered as sources of heat.
  • the plastic powder lying in the recesses of the intermediate carrier is softened and melted on the layer closest to the heat sources in such a way that large pushing forces develop here.
  • the substrate to be coated is then brought into contact with the powder, which is now extremely sticky, at this heat supply zone.
  • the substrate 11 to be coated can be guided around or along a pressure roller 10, which presses on the intermediate carrier 5 with the interposition of the substrate.
  • the extremely sticky powder now immediately adheres to the base to be coated and is drawn from the base 11 of the intermediate carrier 5 by the base 11 running around the press roller 10.
  • the temperature control can be regulated by means of cooling and heating means in the press roller 10, with which a temperature gradient can be achieved between the surface of the intermediate carrier and the substrate to be coated.
  • the area of the intermediate carrier provided with powder is at least as wide as the surface to be coated.
  • the surface of the intermediate carrier provided with powder must also be aligned with the surface of the surface to be coated. This can be done either by powder removal from the heat supply zone, by suctioning off the powder 6 that cannot be brought into register with the base to be coated, or by appropriate control of the lateral guidance of the textile web 11.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Coating Apparatus (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Treatments For Attaching Organic Compounds To Fibrous Goods (AREA)
  • Treatment Of Fiber Materials (AREA)

Abstract

With known methods for coating back-cloth with a synthetic powdery product, the back-cloth is subjected to heat treatments; either the length of cloth is used as a heat conveyor, or it is traversed by heat radiation. The present method allows to avoid this. Owing to a metering unit (2), the synthetic powdery product passes from a powder storage tank (1) to the powder dispensing and supply compartment (3) wherefrom it is distributed on a transport surface (5) by means of a scraper (4). Heat sources (7-9) operate without contact, directly to the synthetic powdery product arranged on the intermediary carrier. The back-cloth to be coated (11) is pressed by means of a pressure cylinder (10) against the intermediary carrier (5) where the mostly adhesive powder adheres immediately to the back-cloth (11).

Description

Stoffbahnen mit einer Kunststoffbeschichtung sind bekannt. Die Beschichtung kann prinzipielle mit Pulver oder Pasten erfolgen. Das Aufbringen und Verteilen des Kunststoffes kann direkt, d. h. beispielsweise durch Aufstreuen eines Pulvers auf die textile Unterlage erfolgen oder indirekt mittels einem Zwischenträger, in Form einer gravierten Walze oder einem gelochten Zylinder. Aufstreuverfharen haben den Natchteil, dass das Pulver durch das Auftreten elektrostatischer Kräfte ungleichmässig ausfällt. Demgegenüberweist ein Verfahren, bei dem das Pulver mittels einem Zwischenträger in Form einer gravierten Walze auf die textile Bahn aufgetragen wird, den Vorteil einer gleichmässigen Beschichtun unter Wegfall der störenden Kräfte elektrostatischer Ladungen auf.Fabric webs with a plastic coating are known. The coating can in principle be done with powder or pastes. The application and distribution of the plastic can directly, i. H. for example, by sprinkling a powder on the textile base or indirectly by means of an intermediate carrier, in the form of an engraved roller or a perforated cylinder. Spreading processes have the natch part that the powder is uneven due to the occurrence of electrostatic forces. In contrast, a method in which the powder is applied to the textile web by means of an intermediate carrier in the form of an engraved roller has the advantage of a uniform coating while eliminating the disruptive forces of electrostatic charges.

Das Aufbringen des in den Vertiefungen der gravierten Walze befindlichen Materials auf die Stoffbahn muss mittels Wärme erfolgen. Zudem muss die Stoffbahn mit der gravierten Walze in Kontakt gebracht werden. Die doppelte Aufgabe, einerseits das Pulver durch Kontakt von der gravierten Förderfläche auf die Stoffbahn zu bringen und andererseits dem Kunststoffpulver die nötige Wärme zuzuführen, dass dieses die nötige Klebkraft entwickelt, um an der Stoffbahn zu haften, gelang bisher nicht getrennt zu lösen.The material located in the recesses of the engraved roller must be applied to the fabric using heat. In addition, the fabric web must be brought into contact with the engraved roller. The dual task of firstly bringing the powder onto the fabric web by contact with the engraved conveying surface and secondly supplying the plastic powder with the necessary heat so that it develops the necessary adhesive force to adhere to the web has not yet been able to be solved separately.

So musste bei einem Verfahren die Stoffbahn durch vorgeschaltete Wärmequellen derart hoch aufgeheizt werden, dass bei der Berührung der heissen Stoffbahn mit dem in den Vertiefungen der gravierten und gekühlten Walze enthaltenen Pulver dieses an der Stoffbahn augenblicklich anhaftet.In one method, the fabric had to be heated to such an extent by upstream heat sources that when the hot fabric touched the powder contained in the recesses of the engraved and cooled roller, it immediately adhered to the fabric.

Gemäss einem in der FR-A-2 454 334 offenbarten Verfahren wird das in die Vertiefungen des Zwischenträgers eingebrachte Pulver, während der Förderung auf dem Zwischenträger unter Zuführung von Wärme, durch die um mehr als den halben Umfang um den Zwischenträger geführte textile Unterlage hindurch, in einen so klebrigen Zustand versetzt, dass das Pulver bei der Wegführung dertextilen Unterlage vom Zwischenträger an der textilen Unterlage haften bleibt.According to a method disclosed in FR-A-2 454 334, the powder introduced into the depressions of the intermediate carrier, while being conveyed on the intermediate carrier with the application of heat, is passed through the textile support which is guided around the intermediate carrier by more than half the circumference. set in such a sticky state that the powder adheres to the textile base when the textile base is removed from the intermediate carrier.

Obwohl die Temperaturführung eigentlich nur von der Wahl des verwendeten Pulvers abhängt, welches einen höheren oder tieferen Schmelzpunkt aufweisen kann, muss die Art der zu beschichtenden textilen Bahn bei allen bisher bekannten Beschichtungsverfahren mittels einem Zwischenträger, zum Beispiel einer gravierten Walze, mit berücksichtigt werden.Although the temperature control actually only depends on the choice of powder used, which may have a higher or lower melting point, the type of textile web to be coated must be taken into account in all previously known coating methods by means of an intermediate carrier, for example an engraved roller.

So ist die Temperaturführung je nach Verfahren davon abhängig, wie dick die zu beschichtende Textilbahn ist, welche Farbe sie hat, welche Wärmeleitfähigkeit oder Strahlendurchlässigkeit sie aufweist, welche Wärmekapazität sie besitzt, und welche chemische Beschaffenheit sie hat.Depending on the process, the temperature control depends on how thick the textile web to be coated is, what color it has, what thermal conductivity or radiation permeability it has, what heat capacity it has, and what chemical nature it has.

Ein Versuch, eine Textilbahn mit Pulver zu beschichten, wobei zwei verschiedenartige Kunststoffpulverpunkte übereinander gelagert werden sollen, ist in der CH-A-604 927 beschrieben. Hierbei soll das Pulver auf eine gravierte Druckwalze aufgebracht werden, die auf eine Temperaturangeheizt ist, die ein Anschmelzen des Pulvers auf der gravierten Walze bewirkt. Das Pulver befindet sich dabei auf der Vorstufe der Plastifizierung. Eine geheizte Anpresswalze ist auf der Plastifizierungtemperatur gehalten und soll bewirken, dass das erweichte Pulver auf der heissen Textilbahn haften bleibt. Dieses Procedere wird zweimal durchgeführt, um so eine Beschichtung zu erreichen, bei der zwei unterschiedliche Kunststoffpulverpunkte übereinander gelangen. Bei diesem Verfahren ist nicht nur der Einfluss der zu beschichtenden Textilbahn zu berücksichtigen, sondern auch die unterschiedlichen Pfiastifizierungstemperaturen von zwei unterschiedlichen Kunststoffpulvern müssen auf einen Nenner gebracht werden.An attempt to coat a textile web with powder, wherein two different types of plastic powder points are to be superimposed, is described in CH-A-604 927. Here, the powder is to be applied to an engraved pressure roller which is heated to a temperature which causes the powder to melt on the engraved roller. The powder is at the preliminary stage of plasticization. A heated pressure roller is kept at the plasticizing temperature and is intended to ensure that the softened powder adheres to the hot textile web. This procedure is carried out twice in order to achieve a coating in which two different plastic powder dots overlap. With this method, not only the influence of the textile web to be coated has to be taken into account, but also the different plasticizing temperatures of two different plastic powders have to be brought down to a common denominator.

Die vorliegende Erfindung betrifft ein Verfahren zum Beschichten einer textilen Unterlage aus gewobenem oder ungewobenem Material aus natürlichen oder synthetischen Fasern, bei dem ein Kunststoffpulver über einen mit Vertiefungen versehenen Zwischenträger bei einer das Festkleben des Pulvers auf den Zwischenträger beim Aufbringen und Verteilen desselben vermeidenden Temperatur aufgebracht wird, wobei das in die Vertiefungen des Zwischenträgers eingebrachte Pulver während der Förderung auf dem Zwischenträger unter Zuführung von Wärme in einen so klebrigen Zustand versetzt wird, daß es dort anhafter und durch Berührung mit der textilen Unterlage aus den Vertiefungen des Zwischenträgers entnommen wird. Ein Verfahren dieser Art ist aus der oben erwähnten FR-A-2 454 334 bekannt.The present invention relates to a method for coating a textile base made of woven or non-woven material made of natural or synthetic fibers, in which a plastic powder is applied via a recessed intermediate carrier at a temperature which prevents the powder from sticking to the intermediate carrier when applying and distributing the same , wherein the powder introduced into the recesses of the intermediate carrier is put into a so sticky state during the conveyance on the intermediate carrier with the application of heat that it is more adherent and is removed from the recesses of the intermediate carrier by contact with the textile base. A method of this kind is known from the above-mentioned FR-A-2 454 334.

Es ist die Aufgabe der vorliegenden Erfindung, ein Verfahren der oben genannten Art zu schaffen, bei dem die Temperaturführung unabhängig von der zu beschichtenden Stoffbahn erfolgen kann.It is the object of the present invention to provide a method of the type mentioned above, in which the temperature control can take place independently of the material web to be coated.

Diese Aufgabe löst ein Verfahren gemäss Oberbegriff des Patentanspruches, dass sich dadurch auszeichnet, dass das in die Vertiefungen des Zwischenträgers (5) eingebrachte Pulver während der Förderung auf dem Zwischenträger durch von aussen berührungslos direkt auf das Pulver wirkende Wärmezufuhr in einen so klebrigen Zustand versetzt wird, dass das derart klebrige Pulver zietlich und örtlich nach Abschluss der Wärmezufuhr durch Berührung mit der textilen Unterlage aus den Vertiefungen des Zwischenträgers entnommen wird, indem es bei dieser Berührung augenblicklich an dertextilen Unterlage haftet.This object is achieved by a method according to the preamble of the patent claim, which is characterized in that the powder introduced into the recesses of the intermediate carrier (5) is brought into such a sticky state during the conveyance on the intermediate carrier by heat contact acting directly on the powder from the outside that the sticky powder of this kind is taken out of the recesses of the intermediate carrier by contact with the textile base, in a timely and local manner after the heat supply has ended, by immediately adhering to the textile base upon this contact.

Die Zufuhr der Wärme erfolgt in diesem Fall ohne Behinderung durch die textile Unterlage direkt auf das in den Vertiefungen des Zwischenträgers liegende Pulver. Durch den Wegfall der textilen Unterlage im Bereich der Wärmezuführung auf das Pulver wird die gesamte Temperaturführung erheblich vereinfacht, sind dann doch lediglich stets gleichbleibende Maschinenfaktoren und die nur noch variierenden Kunststoffpulver bei der Temperaturführung zu berücksichtigen.In this case, the heat is supplied directly to the powder lying in the recesses of the intermediate carrier without hindrance through the textile base. By eliminating the textile underlay in the In the area of heat supply to the powder, the entire temperature control is considerably simplified, since then only constant machine factors and the only varying plastic powder have to be taken into account in the temperature control.

Der Zwischenträger lässt sich auf eine nach Massgabe des zu verwenden den Pulvers erforderlichen Temperatur halten. Dies kann durch Wärmezu-oder -abfuhr mittels entsprechenden Heiz- oder Kühlmitteln erfolgen. Dies ist abhängig von der Art der Wärmezuführung zu dem in den Vertiefungen des Zwischenträgers befindlichen Pulver.The intermediate carrier can be kept at a temperature which is required in accordance with the powder to be used. This can be done by supplying or removing heat using appropriate heating or cooling agents. This depends on the type of heat supply to the powder located in the depressions of the intermediate carrier.

Ueber eine Presswalze lässt sich die textile Bahn an den Zwischenträger anlegen, ohne dass dabei andere mechanische Mittel ausser Betracht fallen.The textile web can be placed on the intermediate carrier via a press roller without other mechanical means being disregarded.

Da es wünschenswert ist, dass die Pulvermengen in den Vertiefungen des Zwischenträgers bei der Wärmezufuhr eine Klebrigkeit entwickeln, die von der Innenseite der Vertiefungen nach aussen hin zunimmt, sollte die Wärmezufuhr zum Pulver vorteilhaft von ausserhalb des Zwischenträgers erfolgen.Since it is desirable that the amounts of powder in the recesses of the intermediate carrier develop a stickiness when the heat is applied, which increases from the inside of the recesses to the outside, the heat supply to the powder should advantageously take place from outside the intermediate carrier.

Anhand der beigefügten Zeichnung wird das erfindungsgemässe Verfahren nachfolgend erläutert.The method according to the invention is explained below with reference to the attached drawing.

Das nach Wunsch des Anwenders für das Verfahren zu verwendende und geeignete Pulver befindet sich in einem Pulvervorrastsbehältnis 1. Das im Vorratsbehältnis 1 befindliche Pulver wird mittels einer Dosiervorrichtung nach Massgabe der Aufnahmemenge der in einem Zwischenträger 5 vorgesehenen Vertiefungen dem Pulvervorratsbehältnis 1 entnommen. Eine mögliche Ausführungsform einer solchen Dosiervorrichtung kann eine Dosierwalze 2 sein. Aber auch Rüttelsiebe oder rotierende Bürsten können in Frage kommen ohne dass nochmals andere Dosiervorrichtungen, wie sie in der Technik bekannt sind, ausgeschlossen wären.The powder to be used and suitable for the method according to the wishes of the user is located in a powder storage container 1. The powder in the storage container 1 is removed from the powder storage container 1 by means of a metering device in accordance with the amount of the recesses provided in an intermediate carrier 5. A possible embodiment of such a metering device can be a metering roller 2. Vibrating screens or rotating brushes can also be considered without other metering devices, as are known in the art, being excluded.

Von der Pulverdosiervorrichtung fällt ein Pulvervorhang in einen Pulververteil- und -auftragsraum 3, der mindestens von einer Seite durch ein gekühltes Rakel 4, jedoch vorzugsweise von zwei Seiten von gekühlten Rakeln 4 begrenzt wird. Die beiden hier als Streichrakel 4 dargestellten Rakel 4 sind mitderOberfläche des Zwischenträgers 5 in Kontakt.A powder curtain falls from the powder metering device into a powder distribution and application space 3, which is delimited at least on one side by a cooled doctor blade 4, but preferably on two sides by cooled doctor blades 4. The two squeegees 4 shown here as a doctor blade 4 are in contact with the surface of the intermediate carrier 5.

Das bezüglich der Bewegungsrichtung des Zwischenträgers 5, der hier als eine gravierte Walze dargestellt ist, vordere Rakel 4 dient im wesentlichen lediglich der Begrenzung des Pulververteil- und -auftragraumes 3. Das bezüglich der Bewegungsrichtung des Zwischenträgers 5 nachfolgende gekühlte Rakel 4 sorgt für eine vollständige Füllung der Vertiefungen im Zwischenträger mit Pulver und schabt die überflüssige Menge ab. Bei richtiger Dosierung der Pulverzufuhr befindet sich immer nur eine geringe Pulvermenge im Raum 3, die fortlaufend verarbeitet wird.The front squeegee 4 with respect to the direction of movement of the intermediate carrier 5, which is shown here as an engraved roller, essentially serves only to limit the powder distribution and application space 3. The cooled squeegee 4 with respect to the direction of movement of the intermediate carrier 5 ensures complete filling the recesses in the intermediate carrier with powder and scrape off the unnecessary amount. With the correct dosage of the powder supply, there is always only a small amount of powder in room 3, which is continuously processed.

Der Zwischenträger 5, der als Förderfläche des Pulvers wirkt, kann eine sogenannte in der Pulverbeschichtungstechnik bekannte gravierte Walze sein, ohne dass dies anders gestaltete Zwischenträger 5 als Förderflächen ausschliesst. Der Zwischenträger kann mit Kühl- und/oder Heizmittel ausgerüstet sein, um eine konstante Temperatur der Oberfläche zu bewirken.The intermediate carrier 5, which acts as the conveying surface of the powder, can be a so-called engraved roller known in powder coating technology, without this precluding differently designed intermediate carriers 5 as conveying surfaces. The intermediate carrier can be equipped with coolant and / or heating medium in order to bring about a constant temperature of the surface.

Der sich bewegende Zwischenträger und damit das in seinen Vertiefungen eingerakelte Pulver kommt nun in eine relativ grosse Wärmebehandlungszone. In dieser Zone können ein oder mehrere Wärmequellen 7, 8, 9 in auf das Pulver abgestimmter Weise Wärme direkt auf das in den Vertiefungen liegende Pulver zuführen.The moving intermediate carrier and thus the powder scraped into its recesses now come into a relatively large heat treatment zone. In this zone, one or more heat sources 7, 8, 9 can supply heat directly to the powder lying in the depressions in a manner which is matched to the powder.

Im Gegensatz zu anderen Verfahren ist hier nicht die zu beschichtende Unterlage im Wege. Die Regulierung der Wärmezufuhr braucht somit nur noch auf das zu verwendende Pulver abgestimmt zu werden. Die Unterlage selber wird diesen unerwünschten Wärmeeinflüssen nicht ausgesetzt. Je nach den zu verwendenden Wärmequellen 7, 8, 9 erfolgt die Wärmezufuhr berührungslos, d. h. mittels Wärmestrahlung oder mittels Wärmeleitung oder Wärmemitführung. Auch Kombinationen verschiedener Wärmequellen sind realisierbar. Je nachdem kommen als Wärmequellen Heizflächen oder -walzen, heizstrahler oder heissluft in Frage.In contrast to other processes, the base to be coated is not in the way here. The regulation of the heat supply therefore only needs to be matched to the powder to be used. The underlay itself is not exposed to these undesirable effects of heat. Depending on the heat sources 7, 8, 9 to be used, the heat is supplied without contact, i. H. by means of heat radiation or by means of heat conduction or heat transfer. Combinations of different heat sources are also possible. Depending on this, heating surfaces or rollers, radiant heaters or hot air can be considered as sources of heat.

Unter Einfluss der Wärmezuführung wird das in den Vertiefungen des Zwischenträgers liegende Kunststoffpulver erweicht und an der den Wärmequellen nächstgelegenen Schicht so angeschmolzen, dass sich hier grosse Kiebekräfte entwickeln.Under the influence of the heat supply, the plastic powder lying in the recesses of the intermediate carrier is softened and melted on the layer closest to the heat sources in such a way that large pushing forces develop here.

An dieser Wärmezuführzone anschliessend wird die zu beschichtende Unterlage mit dem nunmehr im höchsten Mass klebrigen Pulver in Berührung gebracht.The substrate to be coated is then brought into contact with the powder, which is now extremely sticky, at this heat supply zone.

Hierzu kann die zu beschichtende Unterlage 11 um oder entlang einer Anpresswalze 10 geführt werden, die unter Zwischenschaltung der Unterlage auf den Zwischenträger 5 drückt. Das im höchsten Mass klebrige Pulver haftet nun augenblicklich an der zu beschichtenden Unterlage und wird von der um die Presswalze 10 laufenden Unterlage 11 aus den Vertiefungen des Zwichenträgers 5 gezogen. Auch hier wieder lässt sich die Temperaturführung durch Kühl-und Wärmemittel in der Presswalze 10 regulieren, womit ein Temperaturgefälle zwischen Oberfläche des Zwischenträgers und der zu beschichtenden Unterlage erzielen iässt.For this purpose, the substrate 11 to be coated can be guided around or along a pressure roller 10, which presses on the intermediate carrier 5 with the interposition of the substrate. The extremely sticky powder now immediately adheres to the base to be coated and is drawn from the base 11 of the intermediate carrier 5 by the base 11 running around the press roller 10. Here, too, the temperature control can be regulated by means of cooling and heating means in the press roller 10, with which a temperature gradient can be achieved between the surface of the intermediate carrier and the substrate to be coated.

Obwohl der wichtigste Anwendungsbereich des Verfahrens in der Beschichtung textiler Unterlagen gesehen wird, kann das Verfahren aber sicherlich auch auf andere Materialien ausgedehnt werden. Gerade die schonende Behandlung der Unterlage, die nicht einer Wärmebehandlung im Auftragsbereich ausgesetzt wird, bringt wesentliche Vorteile für die Beschichtung aller wärmeempfindlichen Materialien, wie Textilien mit hohem Anteil synthetischer Fasern, Imitationsleder, Vliessstoffe und Filze, Papier und Fourniere, um nur einige Möglichkeiten aufzuzählen.Although the most important area of application of the process is seen in the coating of textile underlays, the process can certainly also be extended to other materials. The gentle treatment of the underlay, which is not exposed to heat treatment in the application area, brings significant advantages for the coating of all heat-sensitive materials, such as textiles with a high proportion of synthetic fibers, imitation leather, nonwovens and felts, paper and Fourniere, to list just a few possibilities.

Wichtig beim erfindungsgemässen Verfahren ist es, dass sämtliches auf dem Zwischenträger durch die Wärmezufuhrzone transportiertes und erweichtes Material auch wiederum dem Zwischenträger entnommen wird. Dazu ist es erforderlich, dass die mit Pulver versehene Fläche des Zwischenträgers mindestens gleich breit, wie die zu beschichtende Unterlage ist Zudem muss aber auch die mit Pulver versehene Fläche des Zwischenträgers mit der Fläche der zu beschichtenden Unterlage in Deckung gebracht werden. Dies kann entweder durch PulverentnahmevorderWärmezufuhrzone erfolgen, indem man das seitlich mitderzu beschichtenden Unterlage nicht in Deckung bringbare Pulver absaugt 6 oder durch entsprechende Steuerung der seitlichen Führung der textilen Bahn 11.It is important in the method according to the invention that all the material transported and softened on the intermediate carrier through the heat supply zone is again removed from the intermediate carrier. For this purpose, it is necessary that the area of the intermediate carrier provided with powder is at least as wide as the surface to be coated. In addition, the surface of the intermediate carrier provided with powder must also be aligned with the surface of the surface to be coated. This can be done either by powder removal from the heat supply zone, by suctioning off the powder 6 that cannot be brought into register with the base to be coated, or by appropriate control of the lateral guidance of the textile web 11.

Selbst wenn mit einer Dosiervorrichtung gearbeitet wird, liegt eine geringe Menge Pulvervorrat direkt auf dem Zwischenträger auf. Verweilt das Pulverwährend einer gewissen Zeit unter Wärmeeinfluss könnten sich Klumpen bilden. Dies lässt sich durch eine Pulververteilvorrichtung, die das Kunstsoffpulver ständig bewegt, vermieden werden.Even when working with a dosing device, there is a small amount of powder directly on the intermediate carrier. If the powder remains under the influence of heat for a certain time, lumps could form. This can be avoided by using a powder distribution device that constantly moves the plastic powder.

Claims (9)

1. Process for coating a textile substrate (11) made from a woven or unwoven material of natural or synthetic fibres, in which a plastic powder is applied over an intermediate carrier (5) provided with depressions at a temperature avoiding the sticking of the powder to the intermediate carrier during application and distribution, in which the powder introduced into the depressions of the intermediate carrier is brought into a tacky state during the feeding on said carrier and accompanied by the supply of heat and by contact with the textile substrate is removed from the depressions of the intermediate carrier characterised in that the powder introduced into the depressions of the intermediate carrier (5) during the feeding on the latter, by a heat supply acting from the outside directly and without contact to the powder, is brought into such a tacky state that this tacky powder is removed from the depressions of the intermediate carrier in local manner, after ending the heat supply, by contact with the textile substrate, in that during this contact it momentarily adheres to the textile substrate.
2. Process according to claim 1, characterised in that the intermediate carrier (5) is maintained at the temperature required as a function of the powder to be used and the chosen feed speed.
3. Process according to claim 1, characterised in that the textile substrate (11) to be coated is applied via a pressure roll (10) to intermediate carrier (5).
4. Process according to claim 3, characterised in that the pressure roll (10) is kept at a temperature below that of the intermediate carrier (5).
5. Process according to claim 1, characterised in that the powder from a powder storage container (1) is applied by means of at least one cooled doctor blade (4) to the depressions of the intermediate carrier (5).
6. Process according to claim 1, characterised in that, dosed as a function of the absorptivity of the depressions in the intermediate carrier, the powder is removed from a powder storage container (1) and is subsequently applied to the depressions using a doctor blade.
7. Process according to claim 1, characterised in that the application width and point of the powder to the intermediate carrier (5) prior to the heat supply (7, 8, 9) takes place along the lateral edges by powder removal (6) from the intermediate carrier, as a function of the width and contact point of the textile web (11) with said intermediate carrier (5).
8. Process according to claim 1, characterised in that the lateral guidance of the textile substrate (11) to the contact area with the powder on the intermediate carrier (5) is controlled as a function of the application point to the intermediate carrier.
9. Process according to claim 1, characterised in that the distribution of the plastic powder on the intermediate carrier (5) takes place by means of a powder distribution means (4).
EP83903082A 1982-10-18 1983-10-10 Method for coating back-cloth with a powdery synthetic product Expired - Lifetime EP0122264B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT83903082T ATE19964T1 (en) 1982-10-18 1983-10-10 PROCESS FOR COATING TEXTILE UNDERLAYS WITH PLASTIC POWDER.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH6045/82 1982-10-18
CH604582 1982-10-18

Publications (3)

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EP0122264A1 EP0122264A1 (en) 1984-10-24
EP0122264B1 EP0122264B1 (en) 1986-05-28
EP0122264B2 true EP0122264B2 (en) 1991-09-04

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US (1) US4571351A (en)
EP (1) EP0122264B2 (en)
JP (1) JPS59501855A (en)
DE (1) DE3363796D1 (en)
IT (1) IT1167252B (en)
WO (1) WO1984001526A1 (en)

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CA2120111C (en) * 1993-04-26 2002-06-11 F. Arthur Simmons Method of applying adhesive to porous materials
FR2722520B1 (en) 1994-07-12 1996-10-11 Dickson Saint Clair METHOD FOR COATING A TEXTILE SUPPORT, MEANS FOR IMPLEMENTING THE PROCESS AND TEXTILE SUPPORT OBTAINED USING THE SAME
US5552012A (en) * 1994-09-09 1996-09-03 Kimberly-Clark Corporation Placement of electric-field-responsive material onto a substrate
US5895542A (en) * 1994-11-23 1999-04-20 Appleton Papers Incorporated Coater and a method for coating a substrate
FR2745595B1 (en) * 1996-02-29 1998-05-22 Picardie Lainiere THERMAL ADHESIVE COVER AND MANUFACTURING METHOD THEREOF
US5925406A (en) * 1997-07-18 1999-07-20 The Procter & Gamble Co. Method of making a gas permeable material
CH693870A5 (en) 1998-04-21 2004-03-31 Schaetti Ag Suction device for a colon-coating plant.
DE19905934A1 (en) 1999-02-12 2000-08-17 Beiersdorf Ag Process for producing a coating of solvent-free PSA systems, in particular on release-coated substrates, in connection with crosslinking of the PSA system
JP5623021B2 (en) * 2009-03-02 2014-11-12 ユニ・チャーム株式会社 Coating device

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DE102009023546A1 (en) * 2009-05-30 2010-12-02 Tracto-Technik Gmbh & Co. Kg Dosing device and method for introducing a powdered medium into a liquid
DE102009023546B4 (en) * 2009-05-30 2013-03-28 Tracto-Technik Gmbh & Co. Kg Dosing device for introducing a powdered medium into a liquid

Also Published As

Publication number Publication date
IT8323154A0 (en) 1983-10-05
JPH0422632B2 (en) 1992-04-20
US4571351A (en) 1986-02-18
EP0122264B1 (en) 1986-05-28
EP0122264A1 (en) 1984-10-24
DE3363796D1 (en) 1986-07-03
IT8323154A1 (en) 1985-04-05
WO1984001526A1 (en) 1984-04-26
JPS59501855A (en) 1984-11-08
IT1167252B (en) 1987-05-13

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