WO2004035312A1 - Installation for coating articles by immersion in a liquid supporting a transfer sheet - Google Patents

Installation for coating articles by immersion in a liquid supporting a transfer sheet Download PDF

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Publication number
WO2004035312A1
WO2004035312A1 PCT/FR2003/002991 FR0302991W WO2004035312A1 WO 2004035312 A1 WO2004035312 A1 WO 2004035312A1 FR 0302991 W FR0302991 W FR 0302991W WO 2004035312 A1 WO2004035312 A1 WO 2004035312A1
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WO
WIPO (PCT)
Prior art keywords
liquid
transfer sheet
conveyor
installation according
installation
Prior art date
Application number
PCT/FR2003/002991
Other languages
French (fr)
Inventor
Pierre Dumoux
Original Assignee
High Tech Design
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by High Tech Design filed Critical High Tech Design
Priority to EP03808756A priority Critical patent/EP1551633A1/en
Priority to AU2003301275A priority patent/AU2003301275A1/en
Publication of WO2004035312A1 publication Critical patent/WO2004035312A1/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F17/00—Printing apparatus or machines of special types or for particular purposes, not otherwise provided for
    • B41F17/006—Printing apparatus or machines of special types or for particular purposes, not otherwise provided for for printing on curved surfaces not otherwise provided for
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F17/00—Printing apparatus or machines of special types or for particular purposes, not otherwise provided for
    • B41F17/24—Printing apparatus or machines of special types or for particular purposes, not otherwise provided for for printing on flat surfaces of polyhedral articles

Definitions

  • the present invention relates to an installation for coating articles by means of a transfer sheet.
  • the deposition of the transfer sheet on the upper surface of the liquid is carried out using a deposition device comprising support tubes having suction orifices coming into contact with the lower surface of the transfer sheet to grip that -close near its exits.
  • a pivoting of the support tubes causes a bending of the transfer sheet in its central part which first comes into contact with the liquid.
  • the vacuum applied to the support tubes is then interrupted and the ends of the sheet fall on the liquid.
  • the sheet is not now continuously naked during the entire phase of deposition on the liquid and there is therefore a significant risk of parasitic deformation, or even folding of the sheet in the vicinity of its ends.
  • An object of the invention is to provide an installation for coating articles allowing precise positioning without deformation of the transfer sheet and without trapping air between the film and the surface of the liquid, in particular in the deposition phase. on the liquid.
  • the deposition device comprises a deposition conveyor adapted to move in one direction and mounted on a suitable mobile chassis. to move alternately in the same direction.
  • one end of the tank comprises a retractable flap
  • one end in opposition to the movable frame comprises a blowing nozzle directed inclinedly towards the liquid.
  • the installation comprises an activation device disposed upstream of the deposition device, this activation device comprising a transfer sheet support extending in a direction identical to the deposition conveyor in a plane offset upwards with respect to the deposition conveyor to allow passage of the deposition conveyor below the transfer sheet support, and, in the case of activation by spraying, a movable hood vertically disposed at the - above the sheet support and containing spray nozzles.
  • the transfer sheet is thus prepositioned with respect to the deposit conveyor so that the precise positioning of the transfer sheet on the deposit conveyor is facilitated.
  • FIG. 1 is a schematic illustration of the installation according to the invention.
  • FIG. 2 is a partial perspective view of a wheel for processing the longitudinal edges of the transfer film.
  • FIG. 3 is a partial top view of a transfer sheet after cutting.
  • FIG. 4 is a partial perspective view of the activation station.
  • FIG. 5 is a partial view of Figure 1 illustrating the cutting of the transfer film according to transfer sheets.
  • Figure 6 is a partial view of Figure 1 illustrating the activation step of the transfer sheet.
  • FIG. 7 is a partial view of Figure 1 illustrating the passage of the transfer sheet from the activation station to the depot station.
  • - Figure 8 is a partial view of the figure
  • the installation comprises, in a manner known per se, a support for a reel of transfer film 1, one face of which is coated with a coating to be applied to articles.
  • the installation comprises a treatment device 2 for keeping the longitudinal edges of the film 1 flat.
  • This treatment for keeping the film flat is intended to prevent the longitudinal edges of the film from rolling under the effect of stresses exerted during activation or during expansion on the liquid bath.
  • the treatment device 2 for holding it flat comprises a cylindrical anvil 3 on which two cutting knobs 4 respectively placed in the vicinity of one end of the anvil bear.
  • Each knurling 4 ( Figure 2) comprises two series of cutting sectors 5 in an arc, projecting from the surface of the cylinder 5 between which extend the drive teeth 40.
  • the cutting sectors 5 extend alternately in two circles offset, that is to say that in an axial direction, opposite a cutting sector 5 of one circles the other circle has drive teeth 40.
  • the film 1 is pinched between the anvil 3 and the cutting wheels 4 so that the rotational drive of the anvil 3 causes on the one hand the entrainment of the film 1 and on the other hand the cutting of the film 1 adjacent to the longitudinal edges according to alternating slots 6 (see FIG. 3) which extend parallel to the longitudinal edges.
  • the slots thus produced eliminate the stresses which, when the film is activated or deposited on the liquid, tend to cause rolling of the longitudinal edges of the film.
  • the cuts according to alternating slots as illustrated preferably have a length of the order of 20 mm without lateral covering of the slots with respect to each other.
  • the cutting can be carried out mechanically or thermally, for example using laser radiation, the direction of which is controlled by a pivoting mirror.
  • the installation comprises, in a manner known per se, a device for storing and regulating the tension of the film 1 comprising a cylinder 7 movable in a direction making it possible to vary the length of a loop of film formed around cylinder 7.
  • the installation then comprises a cutting device 8 comprising, in a manner known per se, a fixed clamp 9 and a movable clamp 10 which is mounted on guide rails 11 (see FIG. 4).
  • the fixed clamp 9 and the movable clamp 10 have comb-shaped jaws, respectively 12 and 13.
  • the cutting device further comprises a heating wire 14 mounted on a support 15 movable vertically.
  • the heating wire 14 is, according to one aspect of the invention, preferably in the form of a zigzag so that when it is applied to the film 1 it cuts out along a zigzag edge 16 (FIG. 3), which prevents rolling of the transverse edge when the transfer sheet is placed on the surface of the liquid.
  • the installation comprises an activation device 17.
  • the activation device comprises a sheet support 39 here comprising a belt conveyor 18 carried by a tubular frame 19 suitably connected to a suction source not shown.
  • the upper edge 20 (see FIG. 4) of the chassis 19 is pierced with suction orifices 21 around the entire periphery of the chassis.
  • a hood 22 is mounted vertically movable above the chassis 19 and comprises spray nozzles 23 mounted in a manner known per se on a chain or a belt 24 ensuring a horizontal displacement of the spray nozzles 23.
  • the installation Downstream of the activation device 17, the installation comprises a pivoting connecting flap 25 disposed in the extension of the chassis 19.
  • the installation then comprises a laying device 26.
  • the laying device 26 comprises a deposition conveyor 27 mounted on a chassis 28 movable horizontally to move in alternating directions in the same direction as the deposition conveyor 27.
  • the sheet support 39 of the activation device is offset upward relative to the deposit conveyor 27 to allow passage of the conveyor. deposit 27 below the sheet support 39.
  • the transfer sheet support and the deposit conveyor 27 are further separated by a sheet which is not represented.
  • the installation further comprises a tank 29 in which a liquid 30 is disposed.
  • the tank 29 At its end opposite to the activation device 17 the tank 29 has a wall 31 which separates the tank 29 from a recovery tank 32.
  • a retractable flap 33 is mounted vertically movable on the partition wall 31.
  • the frame 28 of the deposition conveyor 27 At the end facing the recovery tank 32 the frame 28 of the deposition conveyor 27 comprises a blowing nozzle 34 suitably connected to a source of pressurized air (not shown) and inclined towards the upper surface of the liquid 30.
  • a bracket 35 is mounted adjacent to the tank 29 and vertically movably supports a plate 36 carrying the articles 37 to be coated.
  • the transfer film 1 is firstly cut according to transfer sheets of appropriate size so that it can be deposited on the upper surface of the liquid 30.
  • the movable clamp 10 is closed on the film 1 while the fixed clamp 9 is open and the movable clamp 10 is moved over a distance corresponding to the desired length for a transfer sheet.
  • the fixed clamp 9 is closed and the heating wire 14 is moved to come into contact with the film 1 and ensure cutting of the latter.
  • the cut end of the transfer sheet thus identified falls on the conveyor 18 and the frame 19.
  • the movable clamp 10 is again moved to bring the front end of the sheet slightly beyond the front edge of the frame 19 and the movable clamp is opened and then brought back adjacent to the fixed clamp 9.
  • the transfer sheet 38 which has been cut is while pressing on the upper surface of the sheet support 39 ( Figure 6).
  • the tubular frame 19 is placed under vacuum to maintain the transfer sheet 38, and the hood 22 is lowered to come and frame the transfer sheet 38 as illustrated in FIG. 6.
  • the spray nozzles 23 are supplied with activation liquid and are moved alternately to ensure scanning of the upper surface of the transfer sheet 38.
  • the support 39 of the transfer sheet 38 preferably has slightly smaller dimensions, by a few millimeters, to those of the transfer sheet 38 so that the support 39 does not receive activation product.
  • the hood 22 is raised then the pivoting flap 25 is tilted to support the front end of the transfer sheet 38 as illustrated in FIG. 7 and the conveyors 18 and 27 are set in motion in the same direction to advance the sheet transfer 38 on the deposit conveyor 27 until the transfer sheet 38 is fully supported by the deposit conveyor 27.
  • the speed of the deposit conveyor 27 is slightly higher than that of the conveyor 18 in order to exercise a pull on the sheet. Identical positioning can be obtained by first retracting the chassis 28 under the activation device 17 and then moving the chassis 28 towards the tank while moving the conveyor 18, the deposition conveyor 27 being stopped. .
  • the transfer sheet 38 When the transfer sheet 38 rests entirely on the deposit conveyor 27, the latter is set in motion while the frame 28 is moved synchronously in the direction of movement of the deposit conveyor 27 but in opposite directions so depositing the transfer sheet 38 on the liquid 30 without relative displacement of the sheet 38 relative to the liquid 30 as illustrated in FIG. 8.
  • the transfer sheet 38 is thus progressively deposited on the upper surface of the liquid 30 without being subjected to stresses which can cause displacement or cause deformation of the sheet 38.
  • the deposit conveyor 27 At the end of the deposition movement of the sheet transfer 38 the deposit conveyor 27 is fully retracted under the activation device and the surface of the transfer sheet 38 is therefore completely free for immersion of the articles 37.
  • the outlet 33 is lowered and the movable frame 28 is gradually brought back above the tank 29 while supplying the blowing nozzle 37 with compressed air which drives the residues from transfer sheet towards the recovery tank 32.
  • the tank is supplied with additional liquid in order to cause a circulation of liquid in the direction of the evacuation of the residues.
  • the removable flap 33 is then raised. The installation is then ready for a new cycle.
  • the installation according to the invention has been described with a film cutting device and an activation device, the installation according to the invention can be carried out with the deposition device only, the pre-cut transfer sheet being able to be placed in a cassette upstream of the deposit conveyor 27.
  • activation has been described according to the mode of implementation comprising a spraying of the activator, it can also be applied by other means, in particular by application to the curtain, the roller or the brush. ... In this case it does not it will generally not be necessary to provide a hood above the coating device.
  • the activation device can also be integrated into the cassette.
  • the transfer sheet In the case of an installation comprising an activation device, it is also possible to provide for the transfer sheet to be moved from the activation device to the deposition conveyor 27 -using the movable clamp 10, the rails of which then extend from on either side of the deposit conveyor 27.
  • the sheet support 39 of the activation device 17 can be produced in the form of a simple plate.
  • the tubular chassis 19 of the activation device can be replaced by a solid chassis on which are fixed suction nozzles flush with the surface of the chassis.

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  • Spray Control Apparatus (AREA)

Abstract

The invention concerns an installation for coating articles comprising a tank (29) containing a liquid (30), and a device for depositing the liquid on a transfer sheet capable of being softened by the liquid, said depositing device including a deposition conveyor (27) adapted to move along a direction and mounted on a mobile frame (28) adapted for reciprocating motion along the same direction.

Description

Installation de revêtement d'articles par immersion dans un liquide supportant une feuille de transfert. Installation for coating articles by immersion in a liquid supporting a transfer sheet.
La présente invention concerne une installation de revêtement d'articles au moyen d'une feuille de transfert .The present invention relates to an installation for coating articles by means of a transfer sheet.
ARRIERE PLAN DE L'INVENTION On connaît, notamment du document FR-A-2 281 833 une installation de revêtement d'articles comprenant une cuve contenant un liquide, un dispositif de dépôt sur le liquide d'une feuille de transfert ramolissable par le liquide, et un dispositif d'immersion d'articles disposé à l'aplomb de la cuve. Un problème important lors du fonctionnement d'une installation de ce type résulte du fait que lorsque la feuille de transfert est déposée sur le liquide, son ramollissement s'accompagne d'une modification de sa surface avec dans le cas particulier de cer- tains films une expansion dans le plan de la surface du liquide jusqu'à ce que les bords de la feuille touchent les parois latérales de la cuve de sorte que si la feuille n'est pas positionnée de façon précise sur la surface du liquide les bords risquent de venir de façon irrégulière en contact avec les parois latérales de la cuve, ce qui provoque une déformation parasite de la feuille, c'est à dire une déformation non prévue à 1 ' avance .BACKGROUND OF THE INVENTION There is known, in particular from document FR-A-2 281 833, an installation for coating articles comprising a tank containing a liquid, a device for depositing on the liquid a transfer sheet which can be softened by the liquid. , and an article immersion device arranged directly above the tank. A major problem during the operation of an installation of this type results from the fact that when the transfer sheet is deposited on the liquid, its softening is accompanied by a modification of its surface with, in the particular case of certain films. expansion in the plane of the surface of the liquid until the edges of the sheet touch the side walls of the tank so that if the sheet is not precisely positioned on the surface of the liquid the edges may come irregularly into contact with the side walls of the tank, which causes parasitic deformation of the sheet, that is to say a deformation not provided in advance.
Dans le document précité le dépôt de la feuille de transfert sur la surface supérieure du liquide est effectué en utilisant un dispositif de dépôt comprenant des tubes supports comportant des orifices d'aspiration venant en contact avec la surface inférieure de la feuille de transfert pour saisir celle-ci à proximité de ses ex- tré ités. Un pivotement des tubes supports provoque un cintrage de la feuille de transfert dans sa partie centrale qui vient tout d'abord en contact avec le liquide. La dépression appliquée aux tubes supports est alors interrompue et les extrémités de la feuille tombent sur le liquidé. Dans ce dispositif la feuille n'est pas mainte- nue de façon continue pendant toute la phase de dépôt sur le liquide et il existe donc un risque important de déformation parasite, voir même de plissement de la feuille au voisinage de ses extrémités. OBJET DE L'INVENTIONIn the aforementioned document the deposition of the transfer sheet on the upper surface of the liquid is carried out using a deposition device comprising support tubes having suction orifices coming into contact with the lower surface of the transfer sheet to grip that -close near its exits. A pivoting of the support tubes causes a bending of the transfer sheet in its central part which first comes into contact with the liquid. The vacuum applied to the support tubes is then interrupted and the ends of the sheet fall on the liquid. In this device the sheet is not now continuously naked during the entire phase of deposition on the liquid and there is therefore a significant risk of parasitic deformation, or even folding of the sheet in the vicinity of its ends. OBJECT OF THE INVENTION
Un but de l'invention est de proposer une installation de revêtement d'articles permettant un positionnement précis et sans déformation de la feuille de transfert et sans emprisonnement d'air entre lé film et la surface du liquide, en particulier dans la phase de dépôt sur le liquide.An object of the invention is to provide an installation for coating articles allowing precise positioning without deformation of the transfer sheet and without trapping air between the film and the surface of the liquid, in particular in the deposition phase. on the liquid.
BREVE DESCRIPTION DE L'INVENTION En vue de la réalisation de ce but on propose selon l'invention une installation du type précité dans laquelle le dispositif de dépôt comprend un convoyeur de dépôt adapté à se déplacer selon une direction et monté sur un châssis mobile adapté à se déplacer de façon alternée selon la même direction.BRIEF DESCRIPTION OF THE INVENTION With a view to achieving this aim, an installation of the aforementioned type is proposed according to the invention in which the deposition device comprises a deposition conveyor adapted to move in one direction and mounted on a suitable mobile chassis. to move alternately in the same direction.
Il est ainsi possible de coordonner les mouve- ments du convoyeur et du châssis mobile pour déposer la feuille sur le liquide sans aucun mouvement relatif de la feuille par rapport au liquide et sans emprisonner d'air. On réalise ainsi un positionnement très précis de la feuille de transfert et son dépôt sur le liquide est ef- fectué sans aucune contrainte risquant de provoquer une déformation parasite .It is thus possible to coordinate the movements of the conveyor and the movable frame in order to deposit the sheet on the liquid without any relative movement of the sheet relative to the liquid and without trapping air. A very precise positioning of the transfer sheet is thus achieved and its deposition on the liquid is carried out without any constraint risking causing parasitic deformation.
Selon une version avantageuse de l'invention une extrémité de la cuve comporte un volet escamotable, et une extrémité en opposition du châssis mobile comporte une buse de soufflage dirigée de façon inclinée vers le liquide. Après immersion des articles dans le liquide recouvert de la feuille de transfert il est ainsi possible d'éliminer les résidus de feuille de transfert surnageant sur la surface du liquide en abaissant le volet escamota- ble pour provoquer un écoulement d'une partie du liquide hors de la cuve et assurer simultanément un balayage de la surface du liquide au moyen de la buse de soufflage tout en déplaçant le châssis mobile dans un sens favorisant le déplacement de résidus de feuille de transfert vers un bac de récupération adjacent à la cuve.According to an advantageous version of the invention, one end of the tank comprises a retractable flap, and one end in opposition to the movable frame comprises a blowing nozzle directed inclinedly towards the liquid. After immersion of the articles in the liquid covered with the transfer sheet, it is thus possible to eliminate the residues of transfer sheet floating on the surface of the liquid by lowering the retractable flap to cause a flow of a part of the liquid. out of the tank and simultaneously ensure a sweeping of the surface of the liquid by means of the blowing nozzle while moving the movable frame in a direction favoring the displacement of transfer sheet residues towards a recovery tank adjacent to the tank.
Selon un autre aspect de l'invention l'installation comporte un dispositif d'activation disposé en amont du dispositif de dépôt, ce dispositif d'activation comportant un support de feuille de trans- fert s'étendant selon une direction identique au convoyeur de dépôt dans un plan décalé vers le haut par rapport au convoyeur de dépôt pour permettre un passage du convoyeur de dépôt en dessous du support de feuille de transfert, et, dans le cas d'une activation par pulvéri- sation, une hotte mobile verticalement disposée au-dessus du support de feuille et contenant des buses de pulvérisation. La feuille de transfert se trouve ainsi prépositionnée par rapport au convoyeur de dépôt de sorte que la mise en place précise de la feuille de transfert sur le convoyeur de dépôt se trouve facilitée.According to another aspect of the invention, the installation comprises an activation device disposed upstream of the deposition device, this activation device comprising a transfer sheet support extending in a direction identical to the deposition conveyor in a plane offset upwards with respect to the deposition conveyor to allow passage of the deposition conveyor below the transfer sheet support, and, in the case of activation by spraying, a movable hood vertically disposed at the - above the sheet support and containing spray nozzles. The transfer sheet is thus prepositioned with respect to the deposit conveyor so that the precise positioning of the transfer sheet on the deposit conveyor is facilitated.
BREVE DESCRIPTION DES DESSINS D'autres caractéristiques et avantages de l'invention apparaîtront à la lecture de la description qui suit d'un mode de réalisation préférée non limitatif de l'invention en relation avec les figures ci-jointes parmi lesquelles :BRIEF DESCRIPTION OF THE DRAWINGS Other characteristics and advantages of the invention will appear on reading the following description of a preferred non-limiting embodiment of the invention in relation to the attached figures among which:
- La figure 1 est une illustration schématique de l'installation selon l'invention.- Figure 1 is a schematic illustration of the installation according to the invention.
- La figure 2 est une vue en perspective par- tielle d'une molette de traitement des bords longitudinaux du film de transfert .- Figure 2 is a partial perspective view of a wheel for processing the longitudinal edges of the transfer film.
- La figure 3 est une vue de dessus partielle d'une feuille de transfert après la découpe.- Figure 3 is a partial top view of a transfer sheet after cutting.
- La figure 4 est une vue en perspective par- tielle du poste d'activation. - La figure 5 est une vue partielle de la figure 1 illustrant le découpage du film de transfert selon des feuilles de transfert.- Figure 4 is a partial perspective view of the activation station. - Figure 5 is a partial view of Figure 1 illustrating the cutting of the transfer film according to transfer sheets.
- La figure 6 est une vue partielle de la figure 1 illustrant l'étape d'activation de la feuille de transfert .- Figure 6 is a partial view of Figure 1 illustrating the activation step of the transfer sheet.
- La figure 7 est une vue partielle de la figure 1 illustrant le passage de la feuille de transfert du poste d'activation au poste de dépôt. - La figure 8 est une vue partielle de la figure- Figure 7 is a partial view of Figure 1 illustrating the passage of the transfer sheet from the activation station to the depot station. - Figure 8 is a partial view of the figure
1 illustrant le dépôt de la feuille de transfert sur le liquide.1 illustrating the deposition of the transfer sheet on the liquid.
DESCRIPTION DETAILLEE DE L'INVENTION En référence à la figure 1 l'installation com- porte de façon connue en soi un support pour une bobine de film de transfert 1 dont une face est revêtue d'un revêtement à appliquer sur des articles.DETAILED DESCRIPTION OF THE INVENTION With reference to FIG. 1, the installation comprises, in a manner known per se, a support for a reel of transfer film 1, one face of which is coated with a coating to be applied to articles.
Selon un aspect de l'invention, l'installation comporte un dispositif 2 de traitement pour un maintien à plat des bords longitudinaux du film 1. Ce traitement pour un maintien à plat est destiné à empêcher les bords longitudinaux du film de roulotter sous l'effet des tensions exercées lors de l'activation ou lors de l'expansion sur le bain de liquide. Dans le mode de réa- lisatiόn illustré le dispositif 2 de traitement pour un maintien à plat comprend une enclume cylindrique 3 sur laquelle prennent appui deux molettes de découpe 4 respectivement disposées au voisinage d'une extrémité de l'enclume 3. Chaque molette 4 (figure 2) comporte deux séries de secteurs tranchants 5 en arc de cercle, en saillie par rapport à la surface du cylindre 5 entre lesquels s'étendent des dents d'entraînement 40. Les secteurs tranchants 5 s'étendent de façon alternée selon deux cercles décalés, c'est-à-dire que selon une direc- tion axiale, en regard d'un secteur tranchant 5 de l'un des cercles l'autre cercle comporte des dents d'entraînement 40. Le film 1 est pincé entre l'enclume 3 et les molettes de découpe 4 de sorte que l'entraînement en rotation de l'enclume 3 provoque d'une part l'entraînement du film 1 et d'autre part la découpe du film 1 de façon adjacente aux bords longitudinaux selon des fentes alternées 6 (voir figure 3) qui s'étendent parallèlement aux bords longitudinaux. Les fentes ainsi réalisées éliminent les contraintes qui, lors de l'activation ou du dépôt du film sur le liquide, tendent à provoquer un roulottement des bords longitudinaux du film. Pour être efficace les découpes selon des fentes alternées comme illustrées ont de préférence une longueur de l'ordre de 20 mm sans recouvrement latéral des fentes les unes par rapport aux autres. On peut également réaliser un traitement de maintien à plat en découpant le bord de la feuille selon un zigzag dont les segments rectili- gnes ont de préférence une longueur de l'ordre de 10 mm. Le découpage peut être effectué de façon mécanique ou de façon thermique, par exemple en utilisant un rayonnement laser dont la direction est commandée par un miroir pivotant .According to one aspect of the invention, the installation comprises a treatment device 2 for keeping the longitudinal edges of the film 1 flat. This treatment for keeping the film flat is intended to prevent the longitudinal edges of the film from rolling under the effect of stresses exerted during activation or during expansion on the liquid bath. In the illustrated embodiment, the treatment device 2 for holding it flat comprises a cylindrical anvil 3 on which two cutting knobs 4 respectively placed in the vicinity of one end of the anvil bear. Each knurling 4 ( Figure 2) comprises two series of cutting sectors 5 in an arc, projecting from the surface of the cylinder 5 between which extend the drive teeth 40. The cutting sectors 5 extend alternately in two circles offset, that is to say that in an axial direction, opposite a cutting sector 5 of one circles the other circle has drive teeth 40. The film 1 is pinched between the anvil 3 and the cutting wheels 4 so that the rotational drive of the anvil 3 causes on the one hand the entrainment of the film 1 and on the other hand the cutting of the film 1 adjacent to the longitudinal edges according to alternating slots 6 (see FIG. 3) which extend parallel to the longitudinal edges. The slots thus produced eliminate the stresses which, when the film is activated or deposited on the liquid, tend to cause rolling of the longitudinal edges of the film. To be effective, the cuts according to alternating slots as illustrated preferably have a length of the order of 20 mm without lateral covering of the slots with respect to each other. It is also possible to carry out a flat-keeping treatment by cutting the edge of the sheet in a zigzag, the rectilinear segments of which preferably have a length of the order of 10 mm. The cutting can be carried out mechanically or thermally, for example using laser radiation, the direction of which is controlled by a pivoting mirror.
En aval du dispositif de traitement 2, l'installation comporte de façon connue en soi un dispo- sitif de stockage et de régulation de tension du film 1 comprenant un cylindre 7 mobile selon une direction permettant de faire varier la longueur d'une boucle de film formée autour du cylindre 7.Downstream of the processing device 2, the installation comprises, in a manner known per se, a device for storing and regulating the tension of the film 1 comprising a cylinder 7 movable in a direction making it possible to vary the length of a loop of film formed around cylinder 7.
Par référence au sens de déplacement du film 1, l'installation comporte ensuite un dispositif de découpe 8 comportant de façon connue en soi une pince fixe 9 et une pince mobile 10 qui est montée sur des rails de guidage 11 (voir figure 4) . La pince fixe 9 et la pince mobile 10 comportent des mâchoires en forme de peigne, res- pectivement 12 et 13. Le dispositif de découpe comporte en outre un fil chauffant 14 monté sur un support 15 mobile verticalement. Comme illustré par la figure 4 le fil chauffant 14 est, selon un aspect de l'invention, de préférence en forme de zigzag de sorte que lorsqu'il est appliqué sur le film 1 il réalise une découpe selon un bord 16 en zigzag (figure 3) , ce qui évite un roulottement du bord transversal lors de la mise en place de la feuille de transfert sur la surface du liquide. Selon le mode de réalisation illustré, l'installation comporte un dispositif d'activation 17. Le dispositif d'activation comprend un support de feuille 39 comportant ici un convoyeur à bande 18 porté par un châssis tubulaire 19 convenablement relié à une source d'aspiration non représentée. Le bord supérieur 20 (voir figure 4) du châssis 19 est percé d'orifices d'aspiration 21 sur tout le pourtour du châssis. Une hotte 22 est montée mobile verticalement au-dessus du châssis 19 et comporte des buses de pulvérisation 23 montées de façon con- nue en soi sur une chaîne ou une courroie 24 assurant un déplacement horizontal des buses de pulvérisation 23.With reference to the direction of movement of the film 1, the installation then comprises a cutting device 8 comprising, in a manner known per se, a fixed clamp 9 and a movable clamp 10 which is mounted on guide rails 11 (see FIG. 4). The fixed clamp 9 and the movable clamp 10 have comb-shaped jaws, respectively 12 and 13. The cutting device further comprises a heating wire 14 mounted on a support 15 movable vertically. As illustrated in FIG. 4, the heating wire 14 is, according to one aspect of the invention, preferably in the form of a zigzag so that when it is applied to the film 1 it cuts out along a zigzag edge 16 (FIG. 3), which prevents rolling of the transverse edge when the transfer sheet is placed on the surface of the liquid. According to the illustrated embodiment, the installation comprises an activation device 17. The activation device comprises a sheet support 39 here comprising a belt conveyor 18 carried by a tubular frame 19 suitably connected to a suction source not shown. The upper edge 20 (see FIG. 4) of the chassis 19 is pierced with suction orifices 21 around the entire periphery of the chassis. A hood 22 is mounted vertically movable above the chassis 19 and comprises spray nozzles 23 mounted in a manner known per se on a chain or a belt 24 ensuring a horizontal displacement of the spray nozzles 23.
En aval du dispositif d'activation 17, l'installation comporte un volet de liaison pivotant 25 disposé dans le prolongement du châssis 19. L'installation comporte ensuite un dispositif de pose 26. Dans le mode de réalisation illustrée le dispositif de pose 26 comprend un convoyeur de dépôt 27 monté sur un châssis 28 mobile horizontalement pour se déplacer dans des sens alternés selon la même direction que le con- voyeur de dépôt 27. Le support de feuille 39 du dispositif d'activation est décalé vers le haut par rapport au convoyeur de dépôt 27 pour permettre un passage du convoyeur . de dépôt 27 en dessous du support de feuille 39. En pratique le support de feuille de transfert et le con- voyeur de dépôt 27 sont en outre séparés par une tôle non représentée .Downstream of the activation device 17, the installation comprises a pivoting connecting flap 25 disposed in the extension of the chassis 19. The installation then comprises a laying device 26. In the illustrated embodiment the laying device 26 comprises a deposition conveyor 27 mounted on a chassis 28 movable horizontally to move in alternating directions in the same direction as the deposition conveyor 27. The sheet support 39 of the activation device is offset upward relative to the deposit conveyor 27 to allow passage of the conveyor. deposit 27 below the sheet support 39. In practice, the transfer sheet support and the deposit conveyor 27 are further separated by a sheet which is not represented.
L'installation comporte en outre une cuve 29 dans laquelle est disposée un liquide 30. A son extrémité opposée au dispositif d'activation 17 la cuve 29 comporte une paroi 31 qui sépare la cuve 29 d'un bac de récupération 32. Un volet escamotable 33 est monté mobile verticalement sur la paroi de séparation 31. A l'extrémité tournée vers le bac de récupération 32 le châssis 28 du convoyeur de dépôt 27 comporte une buse de 'soufflage 34 convenablement reliée à une source d'air sous pression (non représentée) et inclinée vers la surface supérieure du liquide 30.The installation further comprises a tank 29 in which a liquid 30 is disposed. At its end opposite to the activation device 17 the tank 29 has a wall 31 which separates the tank 29 from a recovery tank 32. A retractable flap 33 is mounted vertically movable on the partition wall 31. At the end facing the recovery tank 32 the frame 28 of the deposition conveyor 27 comprises a blowing nozzle 34 suitably connected to a source of pressurized air (not shown) and inclined towards the upper surface of the liquid 30.
Une potence 35 est montée adjacente à la cuve 29 et supporte de façon mobile verticalement une plaque 36 portant les articles 37 devant faire l'objet d'un revêtement .A bracket 35 is mounted adjacent to the tank 29 and vertically movably supports a plate 36 carrying the articles 37 to be coated.
Le fonctionnement de l'installation va maintenant être décrit en relation avec les figures 5 à 8. Le film de transfert 1 est tout d'abord découpé selon des feuilles de transfert de dimension appropriée pour pouvoir être déposé sur la surface supérieure du liquide 30. A cet effet, comme illustré par la figure 5, la pince mobile 10 est refermée sur le film 1 tandis que la pince fixe 9 est ouverte et la pince mobile 10 est déplacée sur une distance correspondant à la longueur souhaitée pour une feuille de transfert. La pince fixe 9 est fermée et le fil chauffant 14 est déplacé pour venir en contact avec le film 1 et assurer une découpe de celui-ci. L'extrémité découpée de la feuille de transfert ainsi in- dividualisée tombe en appui sur le convoyeur 18 et le châssis 19. La pince mobile 10 est à nouveau déplacée pour amener l'extrémité avant de la feuille légèrement au-delà du bord avant du châssis 19 et la pince mobile est ouverte puis ramenée adjacente à la pince fixe 9. La feuille de transfert 38 qui a été découpée est alors en appui sur la surface supérieure du support de feuille 39 (figure 6) . Le châssis tubulaire 19 est mis en dépression pour assurer un maintien de la feuille de transfert 38, et la hotte 22 est abaissée pour venir en- cadrer la feuille de transfert 38 comme illustrée par la figure 6. Les buses de pulvérisation 23 sont alimentées en liquide d'activation et sont déplacées de façon alternée pour assurer un balayage de la surface supérieure de la feuille de transfert 38. A ce propos on notera que le support 39 de la feuille de transfert 38 a de préférence des dimensions légèrement inférieures, de quelques millimètres, à celles de la feuille de transfert 38 afin que le support 39 ne reçoive pas de produit d'activation.The operation of the installation will now be described in relation to FIGS. 5 to 8. The transfer film 1 is firstly cut according to transfer sheets of appropriate size so that it can be deposited on the upper surface of the liquid 30. For this purpose, as illustrated in FIG. 5, the movable clamp 10 is closed on the film 1 while the fixed clamp 9 is open and the movable clamp 10 is moved over a distance corresponding to the desired length for a transfer sheet. The fixed clamp 9 is closed and the heating wire 14 is moved to come into contact with the film 1 and ensure cutting of the latter. The cut end of the transfer sheet thus identified falls on the conveyor 18 and the frame 19. The movable clamp 10 is again moved to bring the front end of the sheet slightly beyond the front edge of the frame 19 and the movable clamp is opened and then brought back adjacent to the fixed clamp 9. The transfer sheet 38 which has been cut is while pressing on the upper surface of the sheet support 39 (Figure 6). The tubular frame 19 is placed under vacuum to maintain the transfer sheet 38, and the hood 22 is lowered to come and frame the transfer sheet 38 as illustrated in FIG. 6. The spray nozzles 23 are supplied with activation liquid and are moved alternately to ensure scanning of the upper surface of the transfer sheet 38. In this regard it will be noted that the support 39 of the transfer sheet 38 preferably has slightly smaller dimensions, by a few millimeters, to those of the transfer sheet 38 so that the support 39 does not receive activation product.
La hotte 22 est relevée puis le volet pivotant 25 est basculé pour venir supporter l'extrémité avant de la feuille de transfert 38 comme illustré sur la figure 7 et les convoyeurs 18 et 27 sont mis en mouvement dans le même sens pour faire avancer la feuille de transfert 38 sur le convoyeur de dépôt 27 jusqu'à ce que la feuille de transfert 38 soit entièrement supportée par le convoyeur de dépôt 27. De préférence la vitesse du convoyeur de dépôt 27 est légèrement supérieure à celle du convoyeur 18 afin d'exercer une traction sur la feuille. Un positionnement identique peut être obtenu en rétractant tout d'abord le châssis 28 sous le dispositif d'activation 17 puis en déplaçant le châssis 28 vers la cuve tout en mettant en mouvement le convoyeur 18, le convoyeur de dépôt 27 étant à l'arrêt.The hood 22 is raised then the pivoting flap 25 is tilted to support the front end of the transfer sheet 38 as illustrated in FIG. 7 and the conveyors 18 and 27 are set in motion in the same direction to advance the sheet transfer 38 on the deposit conveyor 27 until the transfer sheet 38 is fully supported by the deposit conveyor 27. Preferably the speed of the deposit conveyor 27 is slightly higher than that of the conveyor 18 in order to exercise a pull on the sheet. Identical positioning can be obtained by first retracting the chassis 28 under the activation device 17 and then moving the chassis 28 towards the tank while moving the conveyor 18, the deposition conveyor 27 being stopped. .
Lorsque la feuille de transfert 38 repose entiè- rement sur le convoyeur de dépôt 27, celui-ci est mis en mouvement tandis que le châssis 28 est déplacé de façon synchronisée selon la direction de déplacement du convoyeur de dépôt 27 mais en sens opposé de façon à déposer la feuille de transfert 38 sur le liquide 30 sans dépla- cernent relatif de la feuille 38 par rapport au liquide 30 comme illustré par la figure 8. La feuille de transfert 38 est ainsi progressivement déposée sur la surface supérieure du liquide 30 sans subir de contraintes pouvant entraîner un déplacement ou provoquer une déformation de la feuille 38. En fin de mouvement de dépôt de la feuille de transfert 38 le convoyeur de dépôt 27 est entièrement rétracté sous le dispositif d'activation et la surface de la feuille de transfert 38 est donc intégralement libre pour une immersion des articles 37. Après l' immersion et le retrait des articles 37, le volet d'évacuation 33 est abaissé et le châssis mobile 28 est ramené progressivement au-dessus du bac 29 tout en alimentant la buse de soufflage 37 avec de l'air comprimé ce qui chasse les résidus de feuille de transfert vers le bac de récupération 32. De préférence la cuve est alimentée de façon supplémentaire en liquide afin de provoquer une circulation de liquide dans le sens de l'évacuation des résidus. Le volet amovible 33 est ensuite relevé. L'installation est alors prête pour un nouveau cycle . Bien entendu l'invention n'est pas limitée au mode de réalisation particulier décrit et on peut y apporter des variantes de réalisation sans sortir du cadre de l'invention tel que défini par les revendications.When the transfer sheet 38 rests entirely on the deposit conveyor 27, the latter is set in motion while the frame 28 is moved synchronously in the direction of movement of the deposit conveyor 27 but in opposite directions so depositing the transfer sheet 38 on the liquid 30 without relative displacement of the sheet 38 relative to the liquid 30 as illustrated in FIG. 8. The transfer sheet 38 is thus progressively deposited on the upper surface of the liquid 30 without being subjected to stresses which can cause displacement or cause deformation of the sheet 38. At the end of the deposition movement of the sheet transfer 38 the deposit conveyor 27 is fully retracted under the activation device and the surface of the transfer sheet 38 is therefore completely free for immersion of the articles 37. After the immersion and the withdrawal of the articles 37, the shutter d the outlet 33 is lowered and the movable frame 28 is gradually brought back above the tank 29 while supplying the blowing nozzle 37 with compressed air which drives the residues from transfer sheet towards the recovery tank 32. preferably the tank is supplied with additional liquid in order to cause a circulation of liquid in the direction of the evacuation of the residues. The removable flap 33 is then raised. The installation is then ready for a new cycle. Of course, the invention is not limited to the particular embodiment described and it is possible to add variants without departing from the scope of the invention as defined by the claims.
En particulier bien que l'installation selon l'invention ait été décrite avec un dispositif de découpe de film et un dispositif d'activation on peut réaliser l'installation selon l'invention avec le dispositif de dépôt seulement, la feuille de transfert prédécoupée pouvant être disposée dans une cassette en amont du con- voyeur de dépôt 27.In particular although the installation according to the invention has been described with a film cutting device and an activation device, the installation according to the invention can be carried out with the deposition device only, the pre-cut transfer sheet being able to be placed in a cassette upstream of the deposit conveyor 27.
Bien que l'activation ait été décrite selon le mode de mise en œuvre comprenant une pulvérisation de l'activateur, celui-ci peut également être appliqué par d'autres moyens, en particulier par une application au rideau, au rouleau ou à la brosse ... Dans ce cas il ne sera généralement pas nécessaire de prévoir une hotte au- dessus du dispositif d'enduction. Dans le cas d'une alimentation des feuilles à partir d'une cassette on peut également intégrer le dispositif d'activation à la cas- sette.Although activation has been described according to the mode of implementation comprising a spraying of the activator, it can also be applied by other means, in particular by application to the curtain, the roller or the brush. ... In this case it does not it will generally not be necessary to provide a hood above the coating device. In the case of feeding sheets from a cassette, the activation device can also be integrated into the cassette.
Dans le cas d'une installation comportant un dispositif d'activation on peut également prévoir le déplacement de la feuille de transfert depuis le dispositif d'activation vers le convoyeur de dépôt 27 -en utilisant la pince mobile 10 dont les rails se prolongent alors de part et d'autre du convoyeur de dépôt 27. Dans ce cas le support de feuille 39 du dispositif d'activation 17 peut être réalisé sous forme d'une simple plaque.In the case of an installation comprising an activation device, it is also possible to provide for the transfer sheet to be moved from the activation device to the deposition conveyor 27 -using the movable clamp 10, the rails of which then extend from on either side of the deposit conveyor 27. In this case the sheet support 39 of the activation device 17 can be produced in the form of a simple plate.
Le châssis tubulaire 19 du dispositif d'activation peut être remplacé par un châssis plein sur lequel sont fixées des buses d'aspiration affleurant la surface du châssis. On peut également utiliser un convoyeur 18 ayant une surface poreuse et mettre celle-ci en dépression au moyen d'un boîtier d'aspiration disposé sous le brin supérieur du convoyeur.The tubular chassis 19 of the activation device can be replaced by a solid chassis on which are fixed suction nozzles flush with the surface of the chassis. One can also use a conveyor 18 having a porous surface and put it in depression by means of a suction box disposed under the upper strand of the conveyor.
On peut en outre prévoir des raclettes sur les côtés de la buse de soufflage 34 pour venir frotter sur les parois latérales de la cuve 29 pour assurer le nettoyage de celles-ci en même temps que l'élimination des résidus de feuille de transfert. It is also possible to provide squeegees on the sides of the blowing nozzle 34 to rub on the side walls of the tank 29 to ensure the cleaning of these at the same time as the removal of the transfer sheet residues.

Claims

REVENDICATIONS
1. Installation de revêtement d'articles (37) comprenant une cuve (29) contenant un liquide (30) , un dispositif de dépôt sur le liquide (30) d'une feuille de transfert (38) ramollissable par le liquide, et un dispositif (40) d'immersion des articles disposé à l'aplomb de la cuve caractérisé en ce que le dispositif de dépôt comprend un convoyeur de dépôt (27) adapté à se- déplacer se- Ion une direction et monté sur un châssis mobile (28) adapté à se déplacer de façon alternée selon la même direction.1. Installation for coating articles (37) comprising a tank (29) containing a liquid (30), a device for depositing on the liquid (30) a transfer sheet (38) softenable by the liquid, and a device (40) for immersing the articles arranged directly above the tank, characterized in that the deposition device comprises a deposition conveyor (27) adapted to move in one direction and mounted on a movable frame ( 28) adapted to move alternately in the same direction.
2. Installation selon la revendication 1, caractérisée en ce qu'une extrémité de - la cuve (29) comporte un volet escamotable (33) et en ce que une extrémité en opposition au châssis mobile (28) comporte une buse de soufflage (34) dirigée de façon inclinée vers le liquide. -2. Installation according to claim 1, characterized in that one end of - the tank (29) comprises a retractable flap (33) and in that one end in opposition to the movable frame (28) comprises a blowing nozzle (34 ) tilted towards the liquid. -
3. Installation selon la revendication 1, caractérisée en ce qu'elle comporte un dispositif d'activation (17) disposé en amont du dispositif de dépôt, ce dispositif d'activation comportant un support de feuille (39), s' étendant selon une direction identique au convoyeur de dépôt (27) dans un plan décalé vers le haut par rapport au convoyeur de dépôt (27) pour permettre un passage du convoyeur de dépôt (27) en dessous du support de feuille (39) .3. Installation according to claim 1, characterized in that it comprises an activation device (17) disposed upstream of the deposition device, this activation device comprising a sheet support (39), extending in a identical direction to the deposit conveyor (27) in a plane offset upwards with respect to the deposit conveyor (27) to allow passage of the deposit conveyor (27) below the sheet support (39).
4. Installation selon la revendication 3, caractérisée en ce qu'elle comporte une hotte (22) mobile verticalement disposée au-dessus du support de feuilles (39) et contenant des buses de pulvérisation (23) .4. Installation according to claim 3, characterized in that it comprises a hood (22) movable vertically disposed above the sheet support (39) and containing spray nozzles (23).
5. Installation selon la revendication 3, caractérisée en ce que le support de feuille (39) a des dimensions inférieures à la feuille de transfert (38) .5. Installation according to claim 3, characterized in that the sheet support (39) has dimensions smaller than the transfer sheet (38).
6. Installation selon la revendication 3, carac- térisée en ce que le support de feuille de transfert corn- prend un convoyeur à bande (18) .6. Installation according to claim 3, charac- terized in that the transfer sheet support cor- takes a belt conveyor (18).
7. Installation selon la revendication 6, caractérisée en ce que le convoyeur à bande (18) est entouré d'un châssis (19) . 7. Installation according to claim 6, characterized in that the belt conveyor (18) is surrounded by a frame (19).
8. Installation selon la revendication 7, caractérisée en ce que le châssis (19) est tubulaire et comporte un bord supérieur équipé d'orifices d'aspiration (21) .8. Installation according to claim 7, characterized in that the frame (19) is tubular and has an upper edge equipped with suction ports (21).
9. Installation selon la revendication 3, carac- térisée en ce qu'elle comporte un volet escamotable (25) disposé entre le support de feuille (39) et le convoyeur de dépôt (27) . 9. Installation according to claim 3, characterized in that it comprises a retractable flap (25) disposed between the sheet support (39) and the deposition conveyor (27).
PCT/FR2003/002991 2002-10-15 2003-10-10 Installation for coating articles by immersion in a liquid supporting a transfer sheet WO2004035312A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP03808756A EP1551633A1 (en) 2002-10-15 2003-10-10 Installation for coating articles by immersion in a liquid supporting a transfer sheet
AU2003301275A AU2003301275A1 (en) 2002-10-15 2003-10-10 Installation for coating articles by immersion in a liquid supporting a transfer sheet

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0212781 2002-10-15
FR0212781A FR2845624B1 (en) 2002-10-15 2002-10-15 APPARATUS FOR COATING ARTICLES BY IMMERSION IN A LIQUID SUPPORTING A TRANSFER SHEET

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WO2004035312A1 true WO2004035312A1 (en) 2004-04-29

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AU (1) AU2003301275A1 (en)
FR (1) FR2845624B1 (en)
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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4712787A (en) * 1986-04-14 1987-12-15 Princiotta Sr Raymond A Stacking apparatus
EP1010524A1 (en) * 1997-03-12 2000-06-21 Katsuya Industrial Co., Ltd. Printing method and printing press

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5121914A (en) 1974-08-12 1976-02-21 Mikiiku Nakanishi INSATSUHOHO

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4712787A (en) * 1986-04-14 1987-12-15 Princiotta Sr Raymond A Stacking apparatus
EP1010524A1 (en) * 1997-03-12 2000-06-21 Katsuya Industrial Co., Ltd. Printing method and printing press

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EP1551633A1 (en) 2005-07-13
FR2845624A1 (en) 2004-04-16
AU2003301275A1 (en) 2004-05-04
FR2845624B1 (en) 2005-01-07

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