WO2004067267A1 - Device for applying an adhesive film to a flat panel and associated application method - Google Patents

Device for applying an adhesive film to a flat panel and associated application method Download PDF

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Publication number
WO2004067267A1
WO2004067267A1 PCT/FR2004/000128 FR2004000128W WO2004067267A1 WO 2004067267 A1 WO2004067267 A1 WO 2004067267A1 FR 2004000128 W FR2004000128 W FR 2004000128W WO 2004067267 A1 WO2004067267 A1 WO 2004067267A1
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WO
WIPO (PCT)
Prior art keywords
panel
film
support
adhesive film
adhesive
Prior art date
Application number
PCT/FR2004/000128
Other languages
French (fr)
Inventor
Reinhard Georg Otto Hampel
Original Assignee
Display Control
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 Display Control filed Critical Display Control
Publication of WO2004067267A1 publication Critical patent/WO2004067267A1/en

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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C63/00Lining or sheathing, i.e. applying preformed layers or sheathings of plastics; Apparatus therefor
    • B29C63/02Lining or sheathing, i.e. applying preformed layers or sheathings of plastics; Apparatus therefor using sheet or web-like material
    • B29C63/024Lining or sheathing, i.e. applying preformed layers or sheathings of plastics; Apparatus therefor using sheet or web-like material the sheet or web-like material being supported by a moving carriage
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C63/00Lining or sheathing, i.e. applying preformed layers or sheathings of plastics; Apparatus therefor
    • B29C63/0004Component parts, details or accessories; Auxiliary operations
    • B29C63/0013Removing old coatings

Definitions

  • the invention relates to flat panels having adhesive films on at least one of their faces, and in particular the devices and methods for applying such adhesive films to flat panels.
  • the document FR-A-2 648 179 describes a machine for installing intermediate seals for multiple glazing of openings such as windows.
  • a seal is placed between the various panes, in order to fix their spacing and in order to ensure sealing between them.
  • the assembly is then mounted in a chassis.
  • a first pane is scrolled on an air cushion table and then lifted from the table.
  • a second window is scrolled on the air cushion table and simultaneously provided with the seal during its scrolling.
  • the seal is therefore unwound and cut.
  • the second window. is held in position and then applied against the first window.
  • the joint is initially presented in rolled up linear form.
  • the machine implementing this method comprises a device for removing a protective film from the seal and a seal reel.
  • the document TW20000112786 describes a process for depositing and then removing protective layers, used during the manufacture of electronic integrated circuits.
  • Document WO93 / 04968 describes a printing process aimed at ensuring the continuity of the unwinding of paper when replacing the roller in use with a new roll of paper.
  • the end of the new roller is coated with glue and then applied to a portion of the old roller driven in rotation.
  • the new roller is then itself driven so as to ensure a continuous unwinding.
  • Document US Pat. No. 6,363,990 describes a device for applying a coating plaster.
  • the coating coating is typically a coating used to mask typographical errors on documents.
  • the application device comprises a support strip, on which a transferable coating is disposed.
  • the device is designed to avoid reversals of the strip, which often cause breakage of the strip or non-uniform application of the plaster.
  • the application device has a pivoting head over which passes the strip covered with plaster, the plaster being placed on the face of the strip opposite the face in contact with the head.
  • the device comprises coils rotatably mounted relative to a housing and intended respectively for winding and unwinding the strip.
  • the adhesive films are generally presented, before use, as composite films comprising a protective film held on an adhesive face of the adhesive film.
  • the methods of applying an adhesive film to a flat panel conventionally comprise a prior step of separation between the protective film and the adhesive film. This separation takes place continuously and gradually in all cases where the adhesive film can be used continuously.
  • the film In the case of the use of optical films, the film most often has an orientation determined by its manufacturing process.
  • the polarizing films for example are generally polarized parallel or perpendicular to the direction of the unwinding.
  • the direction of orientation of the optical film required on an optical device such as a display screen does not make it possible to apply the film continuously in an economical manner.
  • the orientation of polarizers is most often 45 ° to the edges of the screen, it it is then necessary to cut the film into formats having the required orientation, then to apply the cut formats to the substrates.
  • the protective film is removed, then the adhesive film is temporarily stored and then applied to the panel.
  • Document US-A-5 684 557 describes a machine for applying a polarization film to a glass panel of a liquid crystal screen.
  • the machine comprises a support table provided with suction nozzles intended to maintain the panel in position.
  • the machine includes a panel gripper, moving a blank panel to the support table.
  • the machine also includes a device for gripping a polarizing film, moving the film to the support table.
  • An applicator member applies a roller to the polarizer and moves the roller over the polarization film so as to adhere the polarization film to the glass panel.
  • the machine has actuators then lifting the panel from the table.
  • Air projection nozzles are arranged at one end of the table, and are provided to project air under the raised panel.
  • This projection of air eliminates most of the electrostatic charges deposited on the panel.
  • This machine is complex and can include dust between the polarization film and the glass panel. This machine is unable to precisely position the films on successive panels of different sizes, or even incapable of positioning the films on panels not having a predetermined nominal size.
  • a known prior art repair method included a step of separating the bias film and the glass panel. This separation step was carried out by hand and included the use of cutting tools as well as solvent sprayers. This step of the process was particularly long, tedious, polluting and resulted in a screen still showing adhesive residues and failures in the display structure. Machines for carrying out the separation operation have thus been developed.
  • Document WO-A-92-10922 describes a machine for automatically removing a protective film previously placed on a plate intended to form a printed circuit.
  • a plate intended for the realization of a printed circuit is initially covered with an adhesive protective film on its two faces with a strong adhesion.
  • the adhesion of the films to the plate poses a problem: it is necessary to peel off the films before treating the plate, but peeling regularly causes damage to the internal structure of the liquid crystal displays.
  • the machine for automatically removing the film comprises a member automatically placing a plate in position on a surface of motorized rollers.
  • the machine also includes a member for lifting and detaching an edge of the protective film.
  • the machine includes another member for gradually detaching the entire protective film.
  • the motorized rollers also evacuate the plate when the film has been removed.
  • the member raising and detaching the edge of the film comprises a nozzle for injecting compressed air.
  • the injection of compressed air makes it possible to reduce the adhesion of the film to initiate the detachment of the edge.
  • the member progressively removing the film comprises a clamp intended to grip the edge of the protective film.
  • Document WO-A-02-41071 describes a machine for removing a polarization film from a liquid crystal screen.
  • the machine has a table with a slot.
  • the polarization film is peeled from the panel on one edge, then the peeled part of the film is slid into the slot when the panel is deposited on the table.
  • a machine clamp grips the detached part of the film, then completely removes the film from the panel.
  • the machines for applying polarization films are unsuitable for screens which already have electronic control circuits or which come from an advanced stage of the manufacturing process.
  • the machines for applying polarization films used during the manufacture of liquid crystal displays are unsuitable for carrying out an application process on a liquid crystal display to be repaired.
  • the use of such machines for applying polarization films on successive screens of different sizes would in any case lead to a faulty application of the polarization film.
  • They are also industrial machines designed to process series of identical parts. However, repair shops must deal with arrivals of parts of various sizes and types. A machine suitable for repair work must therefore be easily adjustable for different sizes and types of parts, the time of the operation itself being secondary.
  • the application device of the invention for applying an adhesive film initially belonging to a composite film formed from this adhesive film and from a protective film covering an adhesive face of this adhesive film, comprises:
  • a roller for applying the adhesive film to the panel held on the support the roller being axially movable above the panel support, and further comprises: 5 -a movable support for composite film, integral with the roller in its displacements axial; a flexible link provided with a first and a second fixing points, the protective film being connected to the first and 0 second fixing points to form with the link a loop around the film support.
  • the film support has a flat film receiving surface, the surface having an inclination of between 5 ° and 45 ° relative to the panel support.
  • the panel support has a substantially rectangular panel receiving surface, and in that a recess capable of receiving a
  • control circuit of a liquid crystal display is 0 formed along an edge of the receiving surface.
  • the device comprises several interchangeable panel supports.
  • the panel support has a panel receiving surface and 5 conduits opening onto the receiving surface;
  • the device also has a suction member connected to the conduits and capable of holding a panel in position on the panel support. 0 It can also be provided that the device further comprises:
  • an axial panel stop disposed at an axial end of the panel support; an axial stop of adhesive film, disposed on the axial stop of the panel, and projecting in direction of the panel support relative to the axial panel stop.
  • the axial stop of the adhesive film has a thickness less than or equal to the thickness of the adhesive film to be applied.
  • the roller and the film support are driven in axial translation by a geared motor.
  • the distance between the roller and one end of the film support is less than 100 mm and preferably as small as possible.
  • the invention also relates to a method of applying along an axis on a flat panel, such as a glass panel, an adhesive film initially belonging to a composite film formed from this adhesive film and a protective film. covering an adhesive face of this adhesive film, comprising the steps of:
  • the glass panel belongs to a liquid crystal screen
  • the adhesive film is a polarization film
  • the method further comprises a step of peeling off an old polarization film from the panel before the step of application.
  • the method further comprises a step of maintaining a circuit for controlling the the liquid crystal display in a recess during the application of the polarization film.
  • the method further comprises a step of placing the composite film with an inclination of between 5 ° and 45 ° relative to the panel, before the application step.
  • the method further comprises the step of axially holding the panel, and the separate adhesive edge is brought into axial abutment against the panel so as not to subsequently apply the adhesive film to a part of the panel delimited by the abutment area.
  • the distance between the area of application of the adhesive film and the separation area remains less than 100 mm.
  • - Figure 1 a schematic side view of an adhesive film application device according to the invention, in a rest position;
  • - Figure 2 a side view of the device of Figure 1 after the formation of a loop around a composite film support
  • - Figure 3 a side view of the device of Figures 1 and 2 after placing a panel on a panel support;
  • FIG. 4 a side view on a larger scale of a stop zone of the device in the configuration of FIG. 3;
  • FIG. 5 a side view of the device in an initial position for applying the adhesive film to the support
  • FIG. 7 a front view of a portion of the device during the application of the roll on the adhesive film, in the particular case of the application of an adhesive film on a liquid crystal screen;
  • - Figure 8 a side view in section of a fastener connected to a composite film and attached to a flexible link.
  • the invention provides a device for applying, on a flat panel, an adhesive film belonging to a composite film formed from this film and a protective film covering an adhesive face of this adhesive film.
  • This device has a loop formed around a support for the composite film. The loop is formed by a flexible link provided with first and second fixing means and by the protective film connected to the fixing points.
  • Figure 1 shows a schematic side view of an adhesive film application device 1, in the absence of a composite film comprising the adhesive film to be applied, and in a rest position.
  • the adhesive film application device 1 comprises a panel holding support 2, mounted for example on a frame or table 21 by any suitable means.
  • the panel holding support 2 thus serves to ensure the positioning and the holding in position of a panel having at least one flat surface on which the adhesive film is to be applied.
  • the adhesive film application device 1 further comprises an adhesive film application roller 3.
  • the roller 3 is provided for applying a force to the adhesive film, so that the adhesive face of the adhesive film is applied against a panel maintained on the support 2.
  • the roller 3 is axially movable above the support 2.
  • the axis of mobility corresponds to the direction of application of the adhesive film, generally perpendicular to the largest dimension of the roller.
  • the roller 3 can therefore be mounted for rotation on a gantry 31, movable in translation along the axis of application relative to the panel support 2.
  • the adhesive film application device 1 further comprises a movable composite film support 4.
  • the composite film support is provided to support the composite film, for example by means of a flat film receiving surface 41 on which the composite film can be deposited.
  • the composite film support is movable in axial translation in order to allow adequate movement of the composite film during the application of the adhesive film.
  • the support is integral with the roller in its translations along the axis of application. It is thus guaranteed, as will be described later, that the distance between the area of the adhesive film applied and the area of separation between the adhesive film and the protective film remains substantially constant. This limits the exposed part of the adhesive film when the film is applied to the panel. This reduces the risk of including impurities or bubbles between the panel and the adhesive film.
  • Figure 2 illustrates the device of Figure 1 after the establishment of a composite film 8.
  • the device then comprises a flexible link 5 provided with a first 6 and a second 7 attachment points.
  • a flexible link 5 is used, so as to allow the displacement of the loop formed around the composite film support 4.
  • the protective film 82 of the composite film 8 is connected to the first and second fixing points 6 and 7 to form a loop around the film holder with this protective film.
  • the loop formed makes it possible to obtain a separation between the adhesive film and the protective film, simultaneously with the application of the adhesive film. on the panel. It is thus possible to keep the length of adhesive film discovered substantially constant. We can consider that it is equivalent to connect the rear end of the protective film or the rear end of the adhesive film to the fixing point 7, since the respective rear parts of these films remain integral with each other. during most of the application of the adhesive film.
  • the composite film support 4 preferably comprises rotary references 42 to 44 at its ends, so as to allow a regular displacement and with reduced forces of the formed loop.
  • rollers mounted at their ends on plain bearings housed in the film support 4 can be used.
  • the film reception surface has an adjustable inclination between 5 ° and 45 ° relative to the panel support. 2.
  • the inclination of the support of the receiving surface 41 will be adjusted by the operator at an angle which makes it possible to 0 place the line of application of the adhesive film in the plane containing the receiving surface 41 and exactly under the application roller. An inclination greater than this angle is to be avoided as it causes the film to touch the substrate before the roll, which results in the inclusion of bubbles. Adjusting the angle lower than this angle can on the other hand make it possible to compensate for a certain deformation of slightly rigid films under their own weight, for the
  • the device 1 provides in particular a recess 10 along an edge parallel to the axis of application.
  • the recess 10 is intended to house an electronic control circuit 20 for a liquid crystal screen.
  • These control circuits 20 conventionally have a flexible connection with a screen panel 15. The connection can thus flex to allow insertion of the circuit 20 in the recess. The removal thus makes it possible to apply an adhesive film to a screen, without requiring disassembly, then reassembly of the control circuits 20. Avoiding the disassembly of a control circuit provides time savings and a guarantee of the subsequent operation of the 'screen.
  • the withdrawal 10 can be carried out either by raising the support 2 relative to a plate of the device 1, or by a suitable lowered shape made in the support 2 itself. Of course, several edges may have recesses intended to receive control circuits.
  • the adhesive film application device 1 also preferably has a stop system 9 facilitating the relative placement of a panel 16 and an adhesive film 81.
  • the stop system of Figure 4 is disposed on an axial end of the panel holding support 2.
  • the system 9 comprises a first stop 12, raised relative to the panel receiving surface.
  • the stop 12 is intended to ensure correct axial positioning of the panel 16.
  • the stop 12 is surmounted by an adhesive film positioning stop 13.
  • This stop 13 projects axially in the direction of the panel support relative to the stop 12. This stop therefore partially covers a panel 15 on which the adhesive film 81 is to be applied.
  • This stop 13 allows the end of the adhesive film 81 to be set back relative to an edge of the panel 16.
  • the panel 16 is a liquid crystal screen panel 15.
  • the panel 16 shown in the figures belongs to a liquid crystal screen 15 having two glass panels 16 and 17, as well as a polarization film 18 placed on one side exterior of the panel 17.
  • liquid crystal screens require that an adhesive polarization film applied to a panel 16 be set back with respect to the edge of the panel 16.
  • the panel 16 then has an area not covered by an adhesive polarization film 81 thus applied.
  • the thickness of the stopper 12 is at least equal to the thickness of the panel on which the adhesive film is to be applied.
  • the stop 13 can thus overhang the panel.
  • the stop 12 has the same thickness as the panel or the device provided with the panel on which the adhesive film 81 is to be applied.
  • the stop 13 is flush with the surface of the panel 16. This avoids including bubbles at the start of the application of the adhesive film 81.
  • the stop 13 is also preferable for the stop 13 to have a thickness at most equal to the thickness adhesive film 81 to be applied. When the roller 3 is applied to the adhesive film 81, the stop 13 does not then prevent contact between the roller 3 and the adhesive film 81. It is in particular possible to provide as a stop 13 for falling films of polarization of identical thickness to the polarization adhesive film 81 to be applied to a panel 16 of liquid crystal screen 15.
  • the panel device or support also preferably has an adequate vacuum system to selectively hold the panel in position. It is for example possible to produce, in the panel support, conduits 14 opening onto the panel receiving surface. These conduits 14 are then connected to a pump vacuum adequate to hold a panel in position on the panel support 2. Holding the panel by such a system allows to clear the surface of the panel or screen intended for the application of the adhesive film, while ensuring a hold of the appropriate panel.
  • the adhesive film application device 1 thus has a clamping device 24 making it possible to position and maintain in position the support 2 relative to the chassis 21.
  • the removable supports 2 can thus be fixed and easily removed from the chassis 21.
  • the removable supports 2 also include stop systems 9 of specific dimensions. Provision may be made for the various removable supports 2 and stops 9 to have an identical axial arrangement with respect to the chassis 21. It is then preferably provided that the axial position of the start of application of the roller is also clamped. This starting position is preferably determined so that the roller is applied to the edge of the adhesive film 81 which is in contact with the stop 13. Thus, the initial line of application of the roller 3 on the adhesive film 81 always has the same axial arrangement when placing successive panels with their respective supports 2.
  • the roller it is also possible to provide for the roller to be movable in translation in a direction normal to the receiving surface of the panel holding support 2.
  • the roller 3 thus makes it possible to selectively release the part of the adhesive film 81 to be applied initially, in particular to facilitate the initial manipulations of the application process.
  • the roller has a damped vertical mobility, in order to obtain a substantially constant application force, even when the roller is applied to uneven surfaces. This can in particular be useful at the end of the application of the adhesive film, when using a fixing of the composite film to the flexible bond as described later.
  • the axial displacement of the roller and of the film support can be achieved by any suitable means .
  • the gearmotor forms an axial stop for the movable element 22 .
  • the flexible link 5 used advantageously comprises a latching device 51 which can selectively join 5 parts of the link 5.
  • the flexible link can
  • the latching device 51 may for example have fastenings for two straps of the flexible link 5.
  • the latching device 51 may also 0 have a member for adjusting the distance between the two fixing points 6 and 7.
  • the fixing points 6 and 7 may comprise a rigid part 71 provided with fixing means 75 with the flexible link 5, possibly adjustable.
  • the fasteners 6 5 and 7 may have a flexible film 72 having an articulation 74 with the rigid part 71.
  • the flexible film 72 preferably has a thickness less than the thickness of the composite film 8, in order to facilitate the movement of the loop around the support 4.
  • the flexible film 72 of each attachment can then be connected to the composite film 8 by means of an adhesive tape 73.
  • FIG. 8 schematically represents the rear part of the composite film connected to a fixing 7 of this type.
  • the use of a flexible film 72 connected directly to the adhesive film 81 of the composite film makes it possible to maintain the adhesive film during the end of the application, when the adhesive film 81 and the protective film 82 are completely separated. The flexible film 72 can thus be deformed, then pass partially under the roller without disturbing the end of the application of the adhesive film 81 to the panel 16.
  • the adhesive film 81 comprises an adhesive film made for example of polymer and an adhesive layer distributed over the adhesive film.
  • the adhesive film 81 can have any suitable structure known from the state of the art.
  • the adhesive film 81 to be applied to the panel 16 is initially protected by a protective film 82 with lower adhesion to form a composite film 8.
  • a protective film 82 with lower adhesion to form a composite film 8.
  • the adhesive is intended to adhere to the panel on which it is applied in order to maintain the adhesive film 81 on the panel.
  • the adhesive film 81 can in particular be a polarization film, of the type conventionally used on liquid crystal display panels, or a microprismatic film.
  • the composite film 8 sometimes includes a second protective film adhering to the other face of the adhesive film 81.
  • This second protective film (not shown) may in particular have adequate physical and dimensional properties to stiffen the adhesive film 81.
  • the second protective film may in particular have a rigidity greater than that of the adherent film: this facilitates handling of the assembly, in particular during application to the panel, and reduces the requirements concerning the material or the thickness adherent film.
  • Figure 1 shows the adhesive film application device 1 in its rest position, in the absence of flexible link 5.
  • the assembly formed by the gantry 31, the roller 3 and the composite film support 4 is offset to the right in order to provide good access to the support 2. This position makes it possible in particular to mount or dismount the support 2 of the frame 21.
  • the roller 3 is here in the raised position, according to the possibility presented by the variant of the device described above.
  • the composite film 8 is put in place on the film support 4.
  • the axial ends of the protective film 82 are connected to the fixing points 6 and 7 of the flexible link 5.
  • the fastening 6 was thus connected to the film 82, and the fastening 7 to the adhesive film 81.
  • the adhesive film 81 As the rear ends of the films 81 and 82 remain integral most of the application phase, this amounts to connecting the fastening 7 to the protective film 82. It is however preferable to connect the adhesive film 81 to the fixing 7, so as not to disturb the movement of the composite film on the support 4.
  • the loop around the support 4 is for example formed by placing the film composite on an upper planar surface 41 of the support 4, then closing the latching device 51 under the underside of the support 4.
  • the adhesive film application device 1 then has the configuration illustrated in FIG. 2.
  • the use of the latching device 51 also makes it possible to connect the flexible link 5 in two stages to the composite film 8. It is thus possible to attach halves of flexible links to composite films 8 in series. The loop formed from the connected composite film 8 the link 5 can then be moved by scrolling around the support 4.
  • a panel 16 is placed on the support 2, as shown in FIG. 3.
  • the panel belongs to a liquid crystal screen 15. It may in particular be a liquid crystal screen 15 having a panel
  • FIG. 4 represents an enlargement of the zone of the stop system 9 after the positioning of the screen 15 on the support 2.
  • the screen 15 comprises a glass panel 16 on which an adhesive polarization film must be applied.
  • the screen also includes a second glass panel 17 provided with a polarization film 18. The screen 15 rests on the support 2 by means of the polarization film 18.
  • roller 3 there is in particular the roller 3 above the area initial application.
  • an axial stop can be adjusted to interrupt the drive of the assembly to this initial position.
  • the position of an axial switch 23 is adjusted, on which the gantry abuts to interrupt the reconciliation drive.
  • the separation of the front end of the composite film 8 is initiated.
  • the front edges of the adhesive film 81 and the protective film 82 are thus separated.
  • the loop is made to run on the support 4.
  • the front edge of the adhesive film 81 is thus brought closer to its initial area of application on the panel 16.
  • the rear end of the composite film 8 is moved and the link 5 thus drives the part of the protective film 82 removed under the support 4.
  • the front edge of the adhesive film 81 is brought into contact with the panel 16, as illustrated in FIGS. 5 and 6.
  • the front edge of the adhesive film 81 is for example brought into contact with the stop 13 in order to ensure its adequate positioning with respect to the panel 16.
  • FIG. 6 only the portion of the adhesive film 81 situated between the end of the support 4 and the area of application with the panel 16 is uncovered. The risk of inclusion of dust is thus limited.
  • FIG. 7 also shows the placement of a control circuit 20 of the screen 15 in a recess 10 described previously.
  • the assembly comprising the roller 3 and the support 4 is then axially translated, in order to continue the application of the adhesive film 81 to the panel 16.
  • the applied portion of the adhesive film 81 is held in place on the panel 16 by the roller 3 , the support 4 drives the composite film in translation.
  • the displacement of the assembly thus results simultaneously in the application of the adhesive film, in the gradual separation between the adhesive film 81 and the protective film 82, as well as in the progressive entrainment of the protective film 82 separated along the loop .
  • the speed of the area of application of the adhesive film 81 is substantially identical to the speed of separation of the composite film 8.
  • the exposed area of the adhesive film therefore remains substantially constant. The process is therefore carried out with a relatively simple structure, while limiting the area of the adhesive film 81 capable of receiving dust to a substantially constant area.
  • the translation of the assembly during the application of the adhesive film is preferably carried out with an axial speed of less than 50 mm / s, in order to guarantee good application conditions. If necessary, the motorized assembly reaches its stop position, and the drive in axial translation is interrupted. The roller 3 can then be raised, then the panel or the element comprising the panel can be removed from the support 2.
  • the method and the device according to the invention can be used both for repairing liquid crystal screens on a manufacturing line for repairing used liquid crystal displays. They can also be used for adhesive films such as microprism films.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Liquid Crystal (AREA)
  • Devices For Indicating Variable Information By Combining Individual Elements (AREA)

Abstract

The invention relates to a device (1) for applying an adhesive film (81) to a panel, the adhesive film initially belonging to a composite film (8) comprising said adhesive film (81) and a protective film (82). The inventive device comprises a support (2) for holding the panel and a roller (3) which is used to apply the adhesive film to the panel and which can move axially above the panel support. The invention also comprises: a mobile support (4) for the composite film, which is solidly connected to, and moves axially with, the roller; a flexible connector (5) which is equipped with first and second fixing points (6, 7), the protective film being connected to said first and second fixing points in order to form a loop around the film support with the aforementioned connector. The invention can be used easily to apply adhesive film to a panel.

Description

DISPOSITIF D'APPLICATION D'UN FILM ADHESIF SUR PANNEAU PLAN ET PROCEDE D'APPLICATION ASSOCIE DEVICE FOR APPLYING AN ADHESIVE FILM ONTO A PANEL AND ASSOCIATED APPLICATION METHOD
L'invention concerne les panneaux plans présentant des films adhésifs sur au moins une de leurs faces, et en particulier les dispositifs et procédés d'application de tels films adhésifs sur des panneaux plans. Le document FR-A-2 648 179 décrit une machine de pose de joints intercalaires pour des multiples vitrages d'ouvrants tels que des fenêtres. Durant la fabrication des ouvrants, un joint est disposé entre les différentes vitres, afin de fixer leur écartement et afin d'assurer l'étanchéité entre elles. L'ensemble est ensuite monté dans un châssis. A cette fin, une première vitre est mise en défilement sur une table à coussin d'air puis soulevée de la table. Une deuxième vitre est mise en défilement sur la table à coussin d'air et simultanément munie du joint lors de son défilement. Le joint est pour cela dévidé puis coupé. La deuxième vitre . est maintenue en position puis appliquée contre la première vitre. Le joint se présente initialement sous forme linéaire enroulée. La machine mettant en œuvre ce procédé comprend un dispositif de retrait d'une pellicule de protection du joint et un dévidoir de joint.The invention relates to flat panels having adhesive films on at least one of their faces, and in particular the devices and methods for applying such adhesive films to flat panels. The document FR-A-2 648 179 describes a machine for installing intermediate seals for multiple glazing of openings such as windows. During the manufacture of the openings, a seal is placed between the various panes, in order to fix their spacing and in order to ensure sealing between them. The assembly is then mounted in a chassis. To this end, a first pane is scrolled on an air cushion table and then lifted from the table. A second window is scrolled on the air cushion table and simultaneously provided with the seal during its scrolling. The seal is therefore unwound and cut. The second window. is held in position and then applied against the first window. The joint is initially presented in rolled up linear form. The machine implementing this method comprises a device for removing a protective film from the seal and a seal reel.
Le document TW20000112786 décrit un procédé de dépôt puis de suppression de couches de protection, utilisé lors de la fabrication de circuits intégrés électroniques.The document TW20000112786 describes a process for depositing and then removing protective layers, used during the manufacture of electronic integrated circuits.
Le document WO93/04968 décrit un procédé d'impression visant à assurer la continuité du déroulement de papier lors du remplacement du rouleau en cours d'utilisation par un nouveau rouleau de papier. L'extrémité du nouveau rouleau est enduite de colle puis appliquée sur une portion de l'ancien rouleau entraîné en rotation. Le nouveau rouleau est alors lui-même entraîné de sorte à assurer un déroulement en continu.Document WO93 / 04968 describes a printing process aimed at ensuring the continuity of the unwinding of paper when replacing the roller in use with a new roll of paper. The end of the new roller is coated with glue and then applied to a portion of the old roller driven in rotation. The new roller is then itself driven so as to ensure a continuous unwinding.
Le document US6363990 décrit un dispositif d'application d'un enduit de revêtement. L'enduit de revêtement est typiquement un enduit utilisé pour masquer les fautes de frappes sur des documents. Le dispositif d'application comprend une bande support, sur laquelle est disposé un enduit transférable. Le dispositif est conçu pour éviter les retournements de la bande, souvent à l'origine de ruptures de la bande ou d'application non- uniforme de l'enduit. Le dispositif d'application présente une tête pivotante sur laquelle passe la bande recouverte d'enduit, l'enduit étant disposé sur la face de la bande opposée à la face en contact avec la tête. Le dispositif comprend des bobines montées à rotation par rapport à un boîtier et destinées respectivement à l'enroulement et au déroulement de la bande.Document US Pat. No. 6,363,990 describes a device for applying a coating plaster. The coating coating is typically a coating used to mask typographical errors on documents. The application device comprises a support strip, on which a transferable coating is disposed. The device is designed to avoid reversals of the strip, which often cause breakage of the strip or non-uniform application of the plaster. The application device has a pivoting head over which passes the strip covered with plaster, the plaster being placed on the face of the strip opposite the face in contact with the head. The device comprises coils rotatably mounted relative to a housing and intended respectively for winding and unwinding the strip.
Les films adhésifs se présentent généralement, avant utilisation, comme des films composites comprenant un film de protection maintenu sur une face adhesive du film adhésif. Les procédés d'application d'un film adhésif sur un panneau plan comprennent classiquement une étape préalable de séparation entre le film de protection et le film adhésif. Cette séparation se fait de manière continue et progressive dans tous les cas où le film adhésif peut être utilisé en continu.The adhesive films are generally presented, before use, as composite films comprising a protective film held on an adhesive face of the adhesive film. The methods of applying an adhesive film to a flat panel conventionally comprise a prior step of separation between the protective film and the adhesive film. This separation takes place continuously and gradually in all cases where the adhesive film can be used continuously.
Dans le cas de la mise en œuvre de films optiques le film présente le plus souvent une orientation déterminée par son procédé de fabrication. Les films polarisants par exemple sont généralement polarisés parallèles ou perpendiculaires au sens du déroulement. Très souvent, le sens d'orientation du film optique requis sur un dispositif optique comme un écran d'affichage ne permet pas d'appliquer le film en continu de façon économique. Sur les écrans LCD, l'orientation des polariseurs est le plus souvent à 45° par rapport aux bords de l'écran, il est alors nécessaire de découper le film en formats présentant l'orientation requise, puis d'appliquer les formats découpés sur les substrats. Traditionnellement, le film de protection est retiré, puis le film adhésif est stocké temporairement puis appliqué sur le panneau.In the case of the use of optical films, the film most often has an orientation determined by its manufacturing process. The polarizing films for example are generally polarized parallel or perpendicular to the direction of the unwinding. Very often, the direction of orientation of the optical film required on an optical device such as a display screen does not make it possible to apply the film continuously in an economical manner. On LCD screens, the orientation of polarizers is most often 45 ° to the edges of the screen, it it is then necessary to cut the film into formats having the required orientation, then to apply the cut formats to the substrates. Traditionally, the protective film is removed, then the adhesive film is temporarily stored and then applied to the panel.
Ces procédés présentent des inconvénients. Le demandeur a constaté que la séparation rapide du film de protection induit l'apparition de charges statiques sur le film adhésif, qui attirent alors les particules et poussières environnantes. Le stockage temporaire du film adhésif découvert rend le problème encore plus aigu.These methods have drawbacks. The applicant has found that the rapid separation of the protective film induces the appearance of static charges on the adhesive film, which then attract the surrounding particles and dust. Temporary storage of the discovered adhesive film makes the problem even more acute.
Il est également connu d'appliquer des films adhésifs de polarisation sur la face extérieure de panneaux de verre utilisés comme composants des écrans à cristaux liquides.It is also known to apply polarization adhesive films to the exterior face of glass panels used as components of liquid crystal displays.
Le document US-A-5 684 557 décrit une machine d'application d'un film de polarisation sur un panneau de verre d'écran à cristaux liquides. La machine comprend une table de support munie de buses d'aspiration destinées à assurer le maintien du panneau en position. La machine comprend un dispositif de préhension d'un panneau, déplaçant un panneau vierge jusqu'à la table support. La machine comprend également un dispositif de préhension d'un film de polarisation, déplaçant le film jusqu'à la table support. Un organe d'application applique un rouleau sur le polariseur et déplace le rouleau sur le film de polarisation de sorte à faire adhérer le film de polarisation au panneau de verre. La machine présente des actionneurs soulevant ensuite le panneau par rapport à la table. Des buses de projection d'air sont disposées à une extrémité de la table, et prévues pour projeter de l'air sous le panneau soulevé. Cette projection d'air permet d'éliminer la majeure partie des charges électrostatiques déposées sur le panneau. Cette machine est complexe et peut inclure des poussières entre le film de polarisation et le panneau de verre. Cette machine est incapable de positionner précisément les films sur des panneaux successifs de tailles différentes, voire incapable de positionner les films sur des panneaux n'ayant pas une taille nominale prédéterminée .Document US-A-5 684 557 describes a machine for applying a polarization film to a glass panel of a liquid crystal screen. The machine comprises a support table provided with suction nozzles intended to maintain the panel in position. The machine includes a panel gripper, moving a blank panel to the support table. The machine also includes a device for gripping a polarizing film, moving the film to the support table. An applicator member applies a roller to the polarizer and moves the roller over the polarization film so as to adhere the polarization film to the glass panel. The machine has actuators then lifting the panel from the table. Air projection nozzles are arranged at one end of the table, and are provided to project air under the raised panel. This projection of air eliminates most of the electrostatic charges deposited on the panel. This machine is complex and can include dust between the polarization film and the glass panel. This machine is unable to precisely position the films on successive panels of different sizes, or even incapable of positioning the films on panels not having a predetermined nominal size.
Il est par ailleurs fréquent que les lignes de fabrication d'écrans à cristaux liquides génèrent des rebuts, dus à un défaut d'un film de polarisation de l'écran. Il est également fréquent que le film de polarisation accessible à l'utilisateur soit rayé ou détérioré localement lors de son utilisation. La surface du film de polarisation détériorée perd alors ses fonctions d'affichage.It is also frequent that the production lines for liquid crystal screens generate rejects, due to a defect in a screen polarization film. It is also frequent that the polarization film accessible to the user is scratched or deteriorated locally during its use. The deteriorated polarization film surface then loses its display functions.
Un procédé de réparation connu de l'état de la technique comprenait une étape de séparation du film de polarisation et du panneau de verre. Cette étape de séparation était réalisée à la main et comprenait l'utilisation d'outils coupants ainsi que de projecteurs de solvants. Cette étape du procédé était particulièrement longue, fastidieuse, polluante et aboutissait à un écran présentant encore des résidus d'adhésif et des défaillances de la structure d'affichage. Des machines pour réaliser l'opération de séparation ont ainsi été développées.A known prior art repair method included a step of separating the bias film and the glass panel. This separation step was carried out by hand and included the use of cutting tools as well as solvent sprayers. This step of the process was particularly long, tedious, polluting and resulted in a screen still showing adhesive residues and failures in the display structure. Machines for carrying out the separation operation have thus been developed.
Le document WO-A-92-10922 décrit une machine pour retirer automatiquement un film protecteur préalablement disposé sur une plaque destinée à former un circuit imprimé. Une plaque destinée à la réalisation d'un circuit imprimé est initialement recouverte d'un film protecteur adhésif sur ses deux faces avec une adhérence importante. L'adhérence des films sur la plaque pose un problème : il est nécessaire de décoller les films avant de traiter la plaque mais le décollement provoque régulièrement des dommages sur la structure interne des écrans à cristaux liquides. La machine destinée à retirer automatiquement le film comprend un organe plaçant automatiquement une plaque en position sur une surface de rouleaux motorisés. La machine comprend également un organe pour relever et détacher un bord du film protecteur. La machine comprend un autre organe pour détacher progressivement l'ensemble du film protecteur. Les rouleaux motorisés évacuent également la plaque lorsque le film a été retiré. L'organe relevant et détachant le bord du film comprend une buse d'injection d'air comprimé. L'injection d'air comprimé permet de réduire 1 ' adhérence du film pour initier le détachement du bord. L'organe retirant progressivement le film comprend une pince destinée à saisir le bord du film protecteur.Document WO-A-92-10922 describes a machine for automatically removing a protective film previously placed on a plate intended to form a printed circuit. A plate intended for the realization of a printed circuit is initially covered with an adhesive protective film on its two faces with a strong adhesion. The adhesion of the films to the plate poses a problem: it is necessary to peel off the films before treating the plate, but peeling regularly causes damage to the internal structure of the liquid crystal displays. The machine for automatically removing the film comprises a member automatically placing a plate in position on a surface of motorized rollers. The machine also includes a member for lifting and detaching an edge of the protective film. The machine includes another member for gradually detaching the entire protective film. The motorized rollers also evacuate the plate when the film has been removed. The member raising and detaching the edge of the film comprises a nozzle for injecting compressed air. The injection of compressed air makes it possible to reduce the adhesion of the film to initiate the detachment of the edge. The member progressively removing the film comprises a clamp intended to grip the edge of the protective film.
Le document WO-A-02-41071 décrit une machine pour retirer un film de polarisation d'un écran à cristaux liquides. La machine présente une table présentant une fente. Le film de polarisation est décollé du panneau sur un bord, puis la partie décollée du film est glissée dans la fente lors du dépôt du panneau sur la table. Une pince de la machine vient enserrer la partie décollée du film, puis retire intégralement le film du panneau.Document WO-A-02-41071 describes a machine for removing a polarization film from a liquid crystal screen. The machine has a table with a slot. The polarization film is peeled from the panel on one edge, then the peeled part of the film is slid into the slot when the panel is deposited on the table. A machine clamp grips the detached part of the film, then completely removes the film from the panel.
Ces machines présentent des inconvénients. Ces machines sont complexes et sont inadaptées voire inutilisables pour retirer un film de polarisation d'un écran à cristaux liquides assemblé. De plus, la surface du panneau dont le film a été retiré est sujette aux détériorations et aux dépôts de poussières. Les modes de remplacement du film de polarisation présentent des inconvénients. Le décollage du film de polarisation détérioré présente des risques de détérioration du panneau ou des circuits électroniques qui sont généralement déjà solidaires de l'écran. Le collage du film de polarisation de remplacement est également délicat. Il est fréquent d'inclure des bulles ou de la poussière entre le film de polarisation et le panneau de verre. Les circuits de commande de l'écran gênent également la manipulation de l'écran, tant lors du décollage du film de polarisation détérioré, que lors du collage du film de polarisation de remplacement. De plus, les machines d'application de films de polarisation sont inadaptées pour des écrans présentant déjà des circuits électroniques de commande ou provenant d'une étape avancée du processus de fabrication. De façon générale les machines d'application de films de polarisation utilisées durant la fabrication des écrans à cristaux liquides sont inadaptées pour réaliser un procédé d'application sur un écran à cristaux liquides à réparer. L'utilisation de telles machines pour appliquer des films de polarisation sur des écrans successifs de tailles différentes conduirait quoi qu'il en soit à une application défectueuse du film de polarisation. Il s'agit aussi de machines industrielles prévues pour traiter des séries de pièces identiques. Or, les ateliers de réparation doivent traiter des arrivages de pièces de taille et de type variés. Une machine adaptée aux travaux de réparation doit donc être facilement réglable pour des tailles et types de pièces différentes, le temps de l'opération elle-même étant secondaire.These machines have drawbacks. These machines are complex and are unsuitable or even unusable for removing a polarization film from an assembled liquid crystal screen. In addition, the surface of the panel from which the film has been removed is subject to deterioration and dust deposits. The modes of replacing the polarization film have drawbacks. Takeoff of the deteriorated polarization film presents risks of deterioration of the panel or of the electronic circuits which are generally already integral with the screen. Bonding the replacement polarization film is also tricky. It is common to include bubbles or dust between the polarization film and the glass panel. The screen control circuits also interfere with the handling of the screen, both during take-off of the deteriorated polarization film, and during bonding of the replacement polarization film. In addition, the machines for applying polarization films are unsuitable for screens which already have electronic control circuits or which come from an advanced stage of the manufacturing process. In general, the machines for applying polarization films used during the manufacture of liquid crystal displays are unsuitable for carrying out an application process on a liquid crystal display to be repaired. The use of such machines for applying polarization films on successive screens of different sizes would in any case lead to a faulty application of the polarization film. They are also industrial machines designed to process series of identical parts. However, repair shops must deal with arrivals of parts of various sizes and types. A machine suitable for repair work must therefore be easily adjustable for different sizes and types of parts, the time of the operation itself being secondary.
Il existe donc un besoin, que l'invention vise à satisfaire, pour un dispositif et un procédé résolvant un ou plusieurs de ces problèmes.There is therefore a need, which the invention aims to satisfy, for a device and a method solving one or more of these problems.
Le dispositif d'application de l'invention, pour l'application d'un film adhésif appartenant initialement à un film composite formé de ce film adhésif et d'un film de protection recouvrant une face adhesive de ce film adhésif, comprend:The application device of the invention, for applying an adhesive film initially belonging to a composite film formed from this adhesive film and from a protective film covering an adhesive face of this adhesive film, comprises:
-un support pour maintenir le panneau, et , -un rouleau pour appliquer le film adhésif sur le panneau maintenu sur le support, le rouleau étant axialement mobile au-dessus du support de panneau, et comprend en outre: 5 -un support mobile de film composite, solidaire du rouleau dans ses déplacements axiaux; -un lien souple muni d'un premier et d'un second points de fixation, le film de protection se raccordant sur les premier et 0 second points de fixation pour former avec le lien une boucle autour du support de film. Selon une variante, le support de film présente une , surface de réception de film plane, la surface présentant une inclinaison comprise entre 5° et 45° par rapport au 5 support de panneau.-a support to hold the panel, and , a roller for applying the adhesive film to the panel held on the support, the roller being axially movable above the panel support, and further comprises: 5 -a movable support for composite film, integral with the roller in its displacements axial; a flexible link provided with a first and a second fixing points, the protective film being connected to the first and 0 second fixing points to form with the link a loop around the film support. Alternatively, the film support has a flat film receiving surface, the surface having an inclination of between 5 ° and 45 ° relative to the panel support.
Selon une autre variante, le support de panneau présente une surface de réception de panneau sensiblement rectangulaire, et en ce qu'un retrait apte à recevoir unAccording to another variant, the panel support has a substantially rectangular panel receiving surface, and in that a recess capable of receiving a
, circuit de commande d'un écran à cristaux liquides est 0 ménagé le long d'un bord de la surface de réception., control circuit of a liquid crystal display is 0 formed along an edge of the receiving surface.
Selon encore une variante, le dispositif comprend plusieurs supports de panneau interchangeables.According to yet another variant, the device comprises several interchangeable panel supports.
Selon encore une autre variante, le support de panneau présente une surface de réception de panneau et 5 des conduits débouchant sur la surface de réception;According to yet another variant, the panel support has a panel receiving surface and 5 conduits opening onto the receiving surface;
-le dispositif présente en outre un organe d'aspiration relié aux conduits et susceptible de maintenir un panneau en position sur le support de panneau. 0 On peut également prévoir que le dispositif comprend en outre:the device also has a suction member connected to the conduits and capable of holding a panel in position on the panel support. 0 It can also be provided that the device further comprises:
-une butée axiale de panneau disposée à une extrémité axiale du support de panneau; -une butée axiale de film adhésif, disposée sur la 5 butée axiale de panneau, et faisant saillie en direction du support de panneau par rapport à la butée axiale de panneau.an axial panel stop disposed at an axial end of the panel support; an axial stop of adhesive film, disposed on the axial stop of the panel, and projecting in direction of the panel support relative to the axial panel stop.
Selon une variante, la butée axiale du film adhésif présente une épaisseur inférieure ou égale à l'épaisseur du film adhésif à appliquer.Alternatively, the axial stop of the adhesive film has a thickness less than or equal to the thickness of the adhesive film to be applied.
Selon une autre variante, le rouleau et le support de film sont entraînés en translation axiale par un motoréducteur .According to another variant, the roller and the film support are driven in axial translation by a geared motor.
Selon encore une variante, la distance entre le rouleau et une extrémité du support de film est inférieure à 100 mm et de préférence la plus petite possible.According to yet another variant, the distance between the roller and one end of the film support is less than 100 mm and preferably as small as possible.
L'invention porte également sur un procédé d'application suivant un axe sur un panneau plan, tel qu'un panneau de verre, d'un film adhésif appartenant initialement à un film composite formé de ce film adhésif et d'un film de protection recouvrant une face adhesive de ce film adhésif, comprenant les étapes de:The invention also relates to a method of applying along an axis on a flat panel, such as a glass panel, an adhesive film initially belonging to a composite film formed from this adhesive film and a protective film. covering an adhesive face of this adhesive film, comprising the steps of:
-formation d'une boucle autour d'un support du film composite par raccordement des extrémités du film de protection à des points de fixation d'un lien souple;forming a loop around a support for the composite film by connecting the ends of the protective film to the fixing points of a flexible link;
-séparation du film adhésif et du film de protection sur un bord du film composite; -application du bord du film adhésif séparé sur le panneau;separation of the adhesive film and the protective film on one edge of the composite film; -application of the edge of the separate adhesive film on the panel;
-déplacement axial identique du support de film composite et de la zone d'application du reste du film adhésif. Selon une variante, le panneau de verre appartient à un écran à cristaux liquides, le film adhésif est un film de polarisation, et le procédé comprend en outre une étape de décollement d'un ancien film de polarisation du panneau avant l'étape d'application. Selon une autre variante, le procédé comprend en outre une étape de maintien d'un circuit de commande de l'écran à cristaux liquides dans un retrait durant l'application du film de polarisation.- identical axial displacement of the composite film support and of the application area of the rest of the adhesive film. According to a variant, the glass panel belongs to a liquid crystal screen, the adhesive film is a polarization film, and the method further comprises a step of peeling off an old polarization film from the panel before the step of application. According to another variant, the method further comprises a step of maintaining a circuit for controlling the the liquid crystal display in a recess during the application of the polarization film.
Selon encore une variante, le procédé comprend en outre une étape de placement du film composite avec une inclinaison comprise entre 5° et 45° par rapport au panneau, avant l'étape d'application.According to yet another variant, the method further comprises a step of placing the composite film with an inclination of between 5 ° and 45 ° relative to the panel, before the application step.
Selon encore une autre variante, le procédé comprend en outre l'étape de maintien axial du panneau, et le bord adhésif séparé est mis en butée axiale contre le panneau de façon à ne pas appliquer ultérieurement le film adhésif sur une partie du panneau délimitée par la zone de mise en butée.According to yet another variant, the method further comprises the step of axially holding the panel, and the separate adhesive edge is brought into axial abutment against the panel so as not to subsequently apply the adhesive film to a part of the panel delimited by the abutment area.
Par ailleurs, on prévoit aussi que la distance entre la zone d'application du film adhésif et la zone de séparation reste inférieure à 100mm.Furthermore, it is also expected that the distance between the area of application of the adhesive film and the separation area remains less than 100 mm.
L'invention sera mieux comprise à la lecture de la description qui suit et à l'examen des figures qui l'accompagnent. Les figures montrent:The invention will be better understood on reading the description which follows and on examining the figures which accompany it. The figures show:
-figure 1, une vue de côté schématique d'un dispositif d'application de film adhésif selon l'invention, dans une position de repos;-Figure 1, a schematic side view of an adhesive film application device according to the invention, in a rest position;
-figure 2, une vue de côté du dispositif de la figure 1 après la formation d'une boucle autour d'un support de film composite; -figure 3, une vue de côté du dispositif des figures 1 et 2 après le placement d'un panneau sur un support de panneau;-Figure 2, a side view of the device of Figure 1 after the formation of a loop around a composite film support; -Figure 3, a side view of the device of Figures 1 and 2 after placing a panel on a panel support;
-figure 4, une vue de côté à plus grande échelle d'une zone de butée du dispositif dans la configuration de la figure 3;FIG. 4, a side view on a larger scale of a stop zone of the device in the configuration of FIG. 3;
-figure 5, une vue de côté du dispositif dans une position initiale d'application du film adhésif sur le support;FIG. 5, a side view of the device in an initial position for applying the adhesive film to the support;
-figure 6, une vue de côté à plus grande échelle de la zone d'application initiale du film adhésif; -figure 7, une vue de face d'une portion du dispositif durant l'application du rouleau sur le film adhésif, dans le cas particulier de l'application d'un film adhésif sur un écran à cristaux liquides; -figure 8, une vue de côté en coupe d'une fixation raccordée à un film composite et attachée à un lien souple.-Figure 6, a side view on a larger scale of the initial application area of the adhesive film; FIG. 7, a front view of a portion of the device during the application of the roll on the adhesive film, in the particular case of the application of an adhesive film on a liquid crystal screen; -Figure 8, a side view in section of a fastener connected to a composite film and attached to a flexible link.
L'invention propose un dispositif d'application sur un panneau plan, d'un film adhésif appartenant à un film composite formé de ce film et d'un film de protection recouvrant une face adhesive de ce film adhésif. Ce dispositif présente une boucle formée autour d'un support du film composite. La boucle est formée par un lien souple muni de premier et deuxième moyens de fixation et par le film de protection raccordé aux points de fixation.The invention provides a device for applying, on a flat panel, an adhesive film belonging to a composite film formed from this film and a protective film covering an adhesive face of this adhesive film. This device has a loop formed around a support for the composite film. The loop is formed by a flexible link provided with first and second fixing means and by the protective film connected to the fixing points.
La figure 1 représente une vue schématique de côté d'un dispositif d'application de film adhésif 1, en l'absence d'un film composite comprenant le film adhésif à appliquer, et dans une position de repos. Le dispositif d'application de film adhésif 1 comprend un support de maintien de panneau 2, monté par exemple sur un châssis ou table 21 par tout moyen approprié. Le support de maintien de panneau 2 sert ainsi à assurer le positionnement et le maintien en position d'un panneau présentant au moins une surface plane sur laquelle le film adhésif doit être appliqué.Figure 1 shows a schematic side view of an adhesive film application device 1, in the absence of a composite film comprising the adhesive film to be applied, and in a rest position. The adhesive film application device 1 comprises a panel holding support 2, mounted for example on a frame or table 21 by any suitable means. The panel holding support 2 thus serves to ensure the positioning and the holding in position of a panel having at least one flat surface on which the adhesive film is to be applied.
Le dispositif d'application de film adhésif 1 comprend en outre un rouleau d'application de film adhésif 3. Le rouleau 3 est prévu pour appliquer un effort sur le film adhésif, de sorte que la face adhesive du film adhésif soit appliquée contre un panneau maintenu sur le support 2. Le rouleau 3 est mobile axialement au- dessus du support 2. L'axe de mobilité correspond à la direction d'application du film adhésif, généralement perpendiculaire à la plus grande dimension du rouleau. On utilise de préférence un rouleau 3 également mobile en rotation autour d'un axe parallèle à une ligne d'application sur un film adhésif. Le rouleau 3 peut pour cela être monté à rotation sur un portique 31, mobile en translation suivant l'axe d'application par rapport au support de panneau 2.The adhesive film application device 1 further comprises an adhesive film application roller 3. The roller 3 is provided for applying a force to the adhesive film, so that the adhesive face of the adhesive film is applied against a panel maintained on the support 2. The roller 3 is axially movable above the support 2. The axis of mobility corresponds to the direction of application of the adhesive film, generally perpendicular to the largest dimension of the roller. We preferably uses a roller 3 also movable in rotation about an axis parallel to an application line on an adhesive film. The roller 3 can therefore be mounted for rotation on a gantry 31, movable in translation along the axis of application relative to the panel support 2.
Le dispositif d'application de film adhésif 1 comprend en outre un support mobile de film composite 4. Le support de film composite est prévu pour supporter le film composite, par exemple au moyen d'une surface plane de réception de film 41 sur laquelle le film composite peut être déposé. Le support de film composite est mobile en translation axiale afin de permettre un déplacement adéquat du film composite durant l'application du film adhésif. Le support est solidaire du rouleau dans ses translations suivant l'axe d'application. On garantit ainsi, comme cela sera décrit ultérieurement, que la distance entre la zone du film adhésif appliquée et la zone de séparation entre le film adhésif et le film de protection reste sensiblement constante. On limite ainsi la partie découverte du film adhésif lors de l'application du film sur le panneau. On réduit ainsi le risque d'inclure des impuretés ou des bulles entre le panneau et le film adhésif. La figure 2 illustre le dispositif de la figure 1 après la mise en place d'un film composite 8. Le dispositif comprend alors un lien souple 5 muni d'un premier 6 et d'un second 7 points de fixation. On utilise un lien souple 5, de façon à permettre le déplacement de la boucle formée autour du support de film composite 4. Le film de protection 82 du film composite 8 se raccorde sur les premier et deuxième points de fixation 6 et 7 pour former une boucle autour du support de film avec ce film de protection. La boucle formée permet d'obtenir une séparation entre le film adhésif et le film de protection, simultanée à l'application du film adhésif sur le panneau. On peut ainsi maintenir la longueur de film adhésif découverte sensiblement constante. On peut considérer qu'il est équivalent de raccorder l'extrémité arrière du film de protection ou l'extrémité arrière du 5 film adhésif au point de fixation 7, car les parties arrière respectives de ces films restent solidaires l'une de l'autre durant la majeure partie de l'application du film adhésif.The adhesive film application device 1 further comprises a movable composite film support 4. The composite film support is provided to support the composite film, for example by means of a flat film receiving surface 41 on which the composite film can be deposited. The composite film support is movable in axial translation in order to allow adequate movement of the composite film during the application of the adhesive film. The support is integral with the roller in its translations along the axis of application. It is thus guaranteed, as will be described later, that the distance between the area of the adhesive film applied and the area of separation between the adhesive film and the protective film remains substantially constant. This limits the exposed part of the adhesive film when the film is applied to the panel. This reduces the risk of including impurities or bubbles between the panel and the adhesive film. Figure 2 illustrates the device of Figure 1 after the establishment of a composite film 8. The device then comprises a flexible link 5 provided with a first 6 and a second 7 attachment points. A flexible link 5 is used, so as to allow the displacement of the loop formed around the composite film support 4. The protective film 82 of the composite film 8 is connected to the first and second fixing points 6 and 7 to form a loop around the film holder with this protective film. The loop formed makes it possible to obtain a separation between the adhesive film and the protective film, simultaneously with the application of the adhesive film. on the panel. It is thus possible to keep the length of adhesive film discovered substantially constant. We can consider that it is equivalent to connect the rear end of the protective film or the rear end of the adhesive film to the fixing point 7, since the respective rear parts of these films remain integral with each other. during most of the application of the adhesive film.
Le support de film composite 4 comprend de 0 préférence des renvois rotatifs 42 à 44 à ses extrémités, de façon à permettre un déplacement régulier et avec des efforts réduits de la boucle formée. On peut par exemple utiliser des rouleaux montés à leurs extrémités sur des paliers lisses logés dans le support de film 4. 5 Le cas échéant, la surface de réception de film présente une inclinaison réglable entre 5° et 45° par rapport au support de panneau 2. De façon générale, l'inclinaison du support de la surface de réception 41 sera réglée par l'opérateur à un angle qui permet de 0 placer la ligne d'application du film adhésif dans le plan contenant la surface de réception 41 et exactement sous le rouleau d'application. Une inclinaison supérieure à cet angle est à éviter car elle fait que le film touche le substrat avant le rouleau, ce qui entraîne l'inclusion 5 de bulles. Régler l'angle inférieur à cet angle peut par contré permettre de compenser une certaine déformation de films peu rigides sous leur propre poids, pour lesThe composite film support 4 preferably comprises rotary references 42 to 44 at its ends, so as to allow a regular displacement and with reduced forces of the formed loop. For example, rollers mounted at their ends on plain bearings housed in the film support 4 can be used. 5 If necessary, the film reception surface has an adjustable inclination between 5 ° and 45 ° relative to the panel support. 2. In general, the inclination of the support of the receiving surface 41 will be adjusted by the operator at an angle which makes it possible to 0 place the line of application of the adhesive film in the plane containing the receiving surface 41 and exactly under the application roller. An inclination greater than this angle is to be avoided as it causes the film to touch the substrate before the roll, which results in the inclusion of bubbles. Adjusting the angle lower than this angle can on the other hand make it possible to compensate for a certain deformation of slightly rigid films under their own weight, for the
' empêcher de toucher le substrat avant l'axe du rouleau.'' prevent touching the substrate before the axis of the roller.
On peut également prévoir à cet effet un réglage de la 0 hauteur de la surface 41.One can also provide for this purpose an adjustment of the height of the surface 41.
Selon une variante avantageuse, on utilise un support présentant une surface de réception de panneau sensiblement rectangulaire. Le dispositif 1 ménageAccording to an advantageous variant, use is made of a support having a substantially rectangular panel receiving surface. The 1 household device
* également un retrait le long d'un bord de la surface de 5 réception. Dans l'exemple de la figure 7, le dispositif 1 ménage notamment un retrait 10 le long d'un bord parallèle à l'axe d'application. Le retrait 10 est destiné à loger un circuit électronique de commande 20 d'un écran à cristaux liquides. Ces circuits de commande 20 présentent classiquement une liaison souple avec un panneau de l'écran 15. La liaison peut ainsi fléchir pour permettre l'insertion du circuit 20 dans le retrait. Le retrait permet ainsi d'appliquer un film adhésif sur un écran, sans nécessiter un démontage, puis un remontage des circuits de commande 20. Eviter le démontage d'un circuit de commande procure un gain de temps et une garantie du fonctionnement ultérieur de l'écran. Lors du passage du rouleau d'application, les circuits de commande ne sont ainsi pas détériorés. Le retrait 10 peut être réalisé soit en surélevant le support 2 par rapport à un plateau du dispositif 1, soit par une forme adéquate abaissée ménagée dans le support 2 lui-même. Bien entendu, plusieurs bords peuvent présenter des retraits destinés à recevoir des circuits de commande. * also a shrinkage along an edge of the receiving surface. In the example of FIG. 7, the device 1 provides in particular a recess 10 along an edge parallel to the axis of application. The recess 10 is intended to house an electronic control circuit 20 for a liquid crystal screen. These control circuits 20 conventionally have a flexible connection with a screen panel 15. The connection can thus flex to allow insertion of the circuit 20 in the recess. The removal thus makes it possible to apply an adhesive film to a screen, without requiring disassembly, then reassembly of the control circuits 20. Avoiding the disassembly of a control circuit provides time savings and a guarantee of the subsequent operation of the 'screen. During the passage of the application roller, the control circuits are thus not damaged. The withdrawal 10 can be carried out either by raising the support 2 relative to a plate of the device 1, or by a suitable lowered shape made in the support 2 itself. Of course, several edges may have recesses intended to receive control circuits.
Comme cela apparaît plus clairement aux figures 3 et 4, le dispositif d'application de film adhésif 1 présente également de préférence un système de butée 9 facilitant le placement relatif d'un panneau 16 et d'un film adhésif 81. Le système de butée de la figure 4 est disposé sur une extrémité axiale du support de maintien de panneau 2. Le système 9 comprend une première butée 12, surélevée par rapport à la surface de réception de panneau. La butée 12 est destinée à assurer un positionnement axial correct du panneau 16. La butée 12 est surmontée d'une butée de positionnement de film adhésif 13. Cette butée 13 fait saillie axialement en direction du support de panneau par rapport à la butée 12. Cette butée recouvre donc partiellement un panneau 15 sur lequel le film adhésif 81 doit être appliqué. Cette butée 13 permet de disposer l'extrémité du film adhésif 81 en retrait par rapport à un bord du panneau 16. Ceci est particulièrement avantageux, en particulier lorsque le panneau 16 est un panneau d'écran à cristaux liquides 15. Le panneau 16 représenté dans les figures appartient à un écran à cristaux liquides 15 présentant deux panneaux de verre 16 et 17, ainsi qu'un film de polarisation 18 placé sur une face extérieure du panneau 17. Les écrans à cristaux liquides nécessitent en effet dans la plupart des cas qu'un film adhésif de polarisation appliqué sur un panneau 16 soit disposé en retrait par rapport au bord du panneau 16. Le panneau 16 présente alors une zone non recouverte par un film de polarisation adhésif 81 ainsi appliqué.As can be seen more clearly in FIGS. 3 and 4, the adhesive film application device 1 also preferably has a stop system 9 facilitating the relative placement of a panel 16 and an adhesive film 81. The stop system of Figure 4 is disposed on an axial end of the panel holding support 2. The system 9 comprises a first stop 12, raised relative to the panel receiving surface. The stop 12 is intended to ensure correct axial positioning of the panel 16. The stop 12 is surmounted by an adhesive film positioning stop 13. This stop 13 projects axially in the direction of the panel support relative to the stop 12. This stop therefore partially covers a panel 15 on which the adhesive film 81 is to be applied. This stop 13 allows the end of the adhesive film 81 to be set back relative to an edge of the panel 16. This is particularly advantageous, in particular when the panel 16 is a liquid crystal screen panel 15. The panel 16 shown in the figures belongs to a liquid crystal screen 15 having two glass panels 16 and 17, as well as a polarization film 18 placed on one side exterior of the panel 17. In most cases, liquid crystal screens require that an adhesive polarization film applied to a panel 16 be set back with respect to the edge of the panel 16. The panel 16 then has an area not covered by an adhesive polarization film 81 thus applied.
Il est avantageux que l'épaisseur de la butée 12 soit au moins égale à l'épaisseur du panneau sur lequel le film adhésif doit être appliqué. La butée 13 peut ainsi surplomber le panneau. Il est particulièrement avantageux que la butée 12 présente la même épaisseur que le panneau ou le dispositif muni du panneau sur lequel le film adhésif 81 doit être appliqué. Ainsi, la butée 13 affleure à la surface du panneau 16. On évite ainsi d'inclure des bulles au départ de l'application du film adhésif 81. Il est également préférable que la butée 13 présente une épaisseur au plus égale à l'épaisseur du film adhésif 81 à appliquer. Lors de l'application du rouleau 3 sur le film adhésif 81, la butée 13 n'empêche alors pas le contact entre le rouleau 3 et le film adhésif 81. On peut notamment prévoir d'utiliser en tant que butée 13 des chutes de films de polarisation d'épaisseur identique au film adhésif de polarisation 81 à appliquer sur un panneau 16 d'écran à cristaux liquides 15.It is advantageous for the thickness of the stopper 12 to be at least equal to the thickness of the panel on which the adhesive film is to be applied. The stop 13 can thus overhang the panel. It is particularly advantageous that the stop 12 has the same thickness as the panel or the device provided with the panel on which the adhesive film 81 is to be applied. Thus, the stop 13 is flush with the surface of the panel 16. This avoids including bubbles at the start of the application of the adhesive film 81. It is also preferable for the stop 13 to have a thickness at most equal to the thickness adhesive film 81 to be applied. When the roller 3 is applied to the adhesive film 81, the stop 13 does not then prevent contact between the roller 3 and the adhesive film 81. It is in particular possible to provide as a stop 13 for falling films of polarization of identical thickness to the polarization adhesive film 81 to be applied to a panel 16 of liquid crystal screen 15.
Le dispositif ou le support de panneau présentent également de préférence un système d'aspiration adéquat pour maintenir sélectivement le panneau en position. On peut par exemple réaliser, dans le support de panneau, des conduits 14 débouchant sur la surface de réception du panneau. Ces conduits 14 sont alors connectés à une pompe à vide adéquate pour maintenir un panneau en position sur le support de panneau 2. Le maintien du panneau par un tel système permet de dégager la surface du panneau ou de l'écran destinée à l'application du film adhésif, tout en assurant un maintien du panneau adéquat.The panel device or support also preferably has an adequate vacuum system to selectively hold the panel in position. It is for example possible to produce, in the panel support, conduits 14 opening onto the panel receiving surface. These conduits 14 are then connected to a pump vacuum adequate to hold a panel in position on the panel support 2. Holding the panel by such a system allows to clear the surface of the panel or screen intended for the application of the adhesive film, while ensuring a hold of the appropriate panel.
On peut également prévoir d'utiliser un jeu de plusieurs supports 2 amovibles, présentant chacun des dimensions adaptées à un panneau ou à un écran spécifique. Le dispositif d'application de film adhésif 1 présente ainsi un dispositif de serrage 24 permettant de positionner et de maintenir en position le support 2 par rapport au châssis 21. Les supports amovibles 2 peuvent ainsi être fixés et retirés aisément du châssis 21. On peut alors prévoir que les supports 2 amovibles incluent également des systèmes de butée 9 de dimensions spécifiques. On peut prévoir que les différents supports 2 et butées 9 amovibles aient une disposition axiale identique par rapport au châssis 21. On prévoit alors de préférence que la position axiale du début d'application du rouleau soit également bridée. Cette position de départ est de préférence déterminée pour que le rouleau s'applique sur le bord du film adhésif 81 qui est en contact avec la butée 13. Ainsi, la ligne d'application initiale du rouleau 3 sur le film adhésif 81 a toujours la même disposition axiale lors de la mise en place de panneaux successifs avec leurs supports 2 respectifs.It is also possible to use a set of several removable supports 2, each having dimensions adapted to a specific panel or screen. The adhesive film application device 1 thus has a clamping device 24 making it possible to position and maintain in position the support 2 relative to the chassis 21. The removable supports 2 can thus be fixed and easily removed from the chassis 21. It is possible to then provide that the removable supports 2 also include stop systems 9 of specific dimensions. Provision may be made for the various removable supports 2 and stops 9 to have an identical axial arrangement with respect to the chassis 21. It is then preferably provided that the axial position of the start of application of the roller is also clamped. This starting position is preferably determined so that the roller is applied to the edge of the adhesive film 81 which is in contact with the stop 13. Thus, the initial line of application of the roller 3 on the adhesive film 81 always has the same axial arrangement when placing successive panels with their respective supports 2.
On peut également prévoir que le rouleau soit mobile en translation suivant une direction normale à la surface de réception du support de maintien de panneau 2. Le rouleau 3 permet ainsi de dégager sélectivement la partie du film adhésif 81 à appliquer initialement, afin notamment de faciliter les manipulations initiales du procédé d'application. Dans l'exemple représenté, on prévoit ainsi que le rouleau 3 soit mobile verticalement par rapport au portique 31. On peut également prévoir que le rouleau présente une mobilité verticale amortie, afin d'obtenir une force d'application sensiblement constante, même lorsque le rouleau s'applique sur des surfaces irrégulières. Cela peut notamment être utile sur la fin de l'application du film adhésif, lorsqu'on utilise une 5 fixation du film composite au lien souple telle que décrite ultérieurement. On peut encore prévoir que le rouleau 3 présente un revêtement extérieur en élastomère afin d'augmenter la surface d'application sur le film adhésif 81. 0 Par ailleurs, le déplacement axial du rouleau et du support de film peut être réalisé par tout moyen adéquat. On peut par exemple prévoir un entraînement en translation axiale de type manuel ou par motoréducteur . On peut prévoir que l'entraînement par le motoréducteur 5 11 soit interrompu lorsqu'un élément mobile 22 solidaire en translation du rouleau 3 et du support de film 4 entre en contact avec une butée. On peut prévoir que la position axiale de la butée puisse être modifiée pour s'adapter à différentes dimensions axiales des panneaux 0 16 devant être placés sur le support 2. Dans les exemples représentés, le motoréducteur forme une butée axiale pour l'élément mobile 22.It is also possible to provide for the roller to be movable in translation in a direction normal to the receiving surface of the panel holding support 2. The roller 3 thus makes it possible to selectively release the part of the adhesive film 81 to be applied initially, in particular to facilitate the initial manipulations of the application process. In the example shown, provision is therefore made for the roller 3 to be movable vertically relative to the gantry 31. It can also be provided that the roller has a damped vertical mobility, in order to obtain a substantially constant application force, even when the roller is applied to uneven surfaces. This can in particular be useful at the end of the application of the adhesive film, when using a fixing of the composite film to the flexible bond as described later. Provision may also be made for the roller 3 to have an outer elastomer coating in order to increase the surface of application on the adhesive film 81. 0 Furthermore, the axial displacement of the roller and of the film support can be achieved by any suitable means . One can for example provide a drive in axial translation of the manual type or by geared motor. Provision may be made for the drive by the geared motor 5 11 to be interrupted when a movable element 22 integral in translation with the roller 3 and the film support 4 comes into contact with a stop. It can be provided that the axial position of the stop can be modified to adapt to different axial dimensions of the panels 0 16 to be placed on the support 2. In the examples shown, the gearmotor forms an axial stop for the movable element 22 .
Le lien souple 5 utilisé comprend avantageusement un dispositif d'encliquetage 51 pouvant solidariser 5 sélectivement deux parties du lien 5. Le lien souple peutThe flexible link 5 used advantageously comprises a latching device 51 which can selectively join 5 parts of the link 5. The flexible link can
, ainsi être plus aisément manipulé lors de sa fixation au film composite 8. Le dispositif d'encliquetage 51 peut par exemple présenter des fixations pour deux sangles du lien souple 5. Le dispositif d'encliquetage 51 peut 0 également présenter un organe de réglage de la distance séparant les deux points de fixation 6 et 7., thus be more easily manipulated during its attachment to the composite film 8. The latching device 51 may for example have fastenings for two straps of the flexible link 5. The latching device 51 may also 0 have a member for adjusting the distance between the two fixing points 6 and 7.
, Les points de fixation 6 et 7 peuvent comprendre une partie rigide 71 munie de moyens de fixation 75 avec le lien souple 5, éventuellement réglables. Les fixations 6 5 et 7 peuvent présenter un film souple 72 présentant une articulation 74 avec la partie rigide 71. Le film souple 72 présente de préférence une épaisseur inférieure à l'épaisseur du film composite 8, afin de faciliter le déplacement de la boucle autour du support 4. Le film souple 72 de chaque fixation peut ensuite être raccordé au film composite 8 par l'intermédiaire d'un ruban adhésif 73. La figure 8 représente schématiquement la partie arrière du film composite raccordée à une fixation 7 de ce type. L'utilisation d'un film souple 72 raccordé directement au film adhésif 81 du film composite permet de maintenir le film adhésif durant la fin de l'application, lorsque le film adhésif 81 et le film de protection 82 sont complètement séparés. Le film souple 72 peut ainsi être déformé, puis passer partiellement sous le rouleau sans perturber la fin de 1 ' application .du film adhésif 81 sur le panneau 16., The fixing points 6 and 7 may comprise a rigid part 71 provided with fixing means 75 with the flexible link 5, possibly adjustable. The fasteners 6 5 and 7 may have a flexible film 72 having an articulation 74 with the rigid part 71. The flexible film 72 preferably has a thickness less than the thickness of the composite film 8, in order to facilitate the movement of the loop around the support 4. The flexible film 72 of each attachment can then be connected to the composite film 8 by means of an adhesive tape 73. FIG. 8 schematically represents the rear part of the composite film connected to a fixing 7 of this type. The use of a flexible film 72 connected directly to the adhesive film 81 of the composite film makes it possible to maintain the adhesive film during the end of the application, when the adhesive film 81 and the protective film 82 are completely separated. The flexible film 72 can thus be deformed, then pass partially under the roller without disturbing the end of the application of the adhesive film 81 to the panel 16.
Le film adhésif 81 comprend un film adhérent réalisé par exemple en polymère et une couche d'adhésif répartie sur le film adhérent. Le film adhésif 81 peut présenter toute structure adéquate connue de l'état de la technique. Le film adhésif 81 à appliquer sur le panneau 16 est initialement protégé par un film de protection 82 à moindre adhérence pour former un film composite 8. Lors de la séparation entre le film adhésif 81 et le film de protection 82 à moindre adhérence, la majeure partie de 1 ' adhésif séparant les deux films reste présente sur le film adhésif. L'adhésif est destiné à adhérer au panneau sur lequel il est appliqué afin de maintenir le film adhésif 81 sur le panneau.The adhesive film 81 comprises an adhesive film made for example of polymer and an adhesive layer distributed over the adhesive film. The adhesive film 81 can have any suitable structure known from the state of the art. The adhesive film 81 to be applied to the panel 16 is initially protected by a protective film 82 with lower adhesion to form a composite film 8. During the separation between the adhesive film 81 and the protective film 82 with lower adhesion, the major part of the adhesive separating the two films remains present on the adhesive film. The adhesive is intended to adhere to the panel on which it is applied in order to maintain the adhesive film 81 on the panel.
Le film adhésif 81 peut être en particulier un film de polarisation, du type utilisé classiquement sur les panneaux d'écrans à cristaux liquides, ou un film à microprismes. Le film composite 8 comprend parfois un deuxième film de protection adhérant à l'autre face du film adhésif 81. Ce deuxième film de protection (non représenté) peut notamment présenter des propriétés physiques et dimensionnelles adéquates pour rigidifier le film adhésif 81. Le deuxième film de protection peut notamment présenter une rigidité supérieure à celle du film adhérent: ceci facilite la manipulation de l'ensemble, notamment durant l'application sur le panneau, et réduit les exigences concernant le matériau ou l'épaisseur du film adhérent.The adhesive film 81 can in particular be a polarization film, of the type conventionally used on liquid crystal display panels, or a microprismatic film. The composite film 8 sometimes includes a second protective film adhering to the other face of the adhesive film 81. This second protective film (not shown) may in particular have adequate physical and dimensional properties to stiffen the adhesive film 81. The second protective film may in particular have a rigidity greater than that of the adherent film: this facilitates handling of the assembly, in particular during application to the panel, and reduces the requirements concerning the material or the thickness adherent film.
La description qui suit du procédé d'application du film adhésif 81 permet également de mieux comprendre le fonctionnement du dispositif d'application de film adhésif 1.The following description of the method for applying the adhesive film 81 also makes it possible to better understand the operation of the device for applying the adhesive film 1.
La figure 1 représente le dispositif d'application de film adhésif 1 dans sa position au repos, en l'absence de lien souple 5. L'ensemble formé par le portique 31, le rouleau 3 et le support de film composite 4 est déporté vers la droite afin de fournir un bon accès au support 2. Cette position permet notamment de monter ou démonter le support 2 du châssis 21. Le rouleau 3 est ici en position relevée, suivant la possibilité présentée par la variante du dispositif décrite précédemment. Lors d'une première étape, on met en place le film composite 8 sur le support de film 4. Pour cela, on raccorde les extrémités axiales du film de protection 82 aux points de fixation 6 et 7 du lien souple 5. Dans l'exemple, on a ainsi raccordé la fixation 6 au film 82, et la fixation 7 au film adhésif 81. Comme les extrémités arrière des films 81 et 82 restent solidaires la majeure partie de la phase d'application, cela revient à raccorder la fixation 7 au film de protection 82. Il est cependant préférable de raccorder le film adhésif 81 à la fixation 7, afin de ne pas perturber le déplacement du film composite sur le support 4. La boucle autour du support 4 est par exemple formée en posant le film composite sur une surface plane supérieure 41 du support 4, puis en fermant le dispositif d'encliquetage 51 sous la face inférieure du support 4. Le dispositif d'application de film adhésif 1 présente alors la configuration illustrée à la figure 2. L'utilisation du dispositif d'encliquetage 51 permet également de raccorder le lien souple 5 en deux étapes au film composite 8. On peut ainsi fixer en série des moitiés de liens souples à des films composites 8. La boucle formée du film composite 8 raccordé au lien 5 peut alors être déplacée par défilement autour du support 4.Figure 1 shows the adhesive film application device 1 in its rest position, in the absence of flexible link 5. The assembly formed by the gantry 31, the roller 3 and the composite film support 4 is offset to the right in order to provide good access to the support 2. This position makes it possible in particular to mount or dismount the support 2 of the frame 21. The roller 3 is here in the raised position, according to the possibility presented by the variant of the device described above. During a first step, the composite film 8 is put in place on the film support 4. For this, the axial ends of the protective film 82 are connected to the fixing points 6 and 7 of the flexible link 5. In the example, the fastening 6 was thus connected to the film 82, and the fastening 7 to the adhesive film 81. As the rear ends of the films 81 and 82 remain integral most of the application phase, this amounts to connecting the fastening 7 to the protective film 82. It is however preferable to connect the adhesive film 81 to the fixing 7, so as not to disturb the movement of the composite film on the support 4. The loop around the support 4 is for example formed by placing the film composite on an upper planar surface 41 of the support 4, then closing the latching device 51 under the underside of the support 4. The adhesive film application device 1 then has the configuration illustrated in FIG. 2. The use of the latching device 51 also makes it possible to connect the flexible link 5 in two stages to the composite film 8. It is thus possible to attach halves of flexible links to composite films 8 in series. The loop formed from the connected composite film 8 the link 5 can then be moved by scrolling around the support 4.
Dans une étape ultérieure, on place un panneau 16 sur le support 2, comme représenté à la figure 3. Dans l'exemple de la figure 3, le panneau appartient à un écran à cristaux liquides 15. Il peut notamment s'agir d'un écran à cristaux liquides 15 présentant un panneauIn a subsequent step, a panel 16 is placed on the support 2, as shown in FIG. 3. In the example of FIG. 3, the panel belongs to a liquid crystal screen 15. It may in particular be a liquid crystal screen 15 having a panel
16 dont on a retiré un film de polarisation précédent. Le panneau 16 est maintenu en position par tout moyen adéquat. On peut par exemple utiliser le dispositif d'aspiration décrit auparavant pour réaliser une dépression d'air au niveau de la surface de réception du support 2 sur laquelle l'écran est disposé. On vérifiera de préférence la propreté du panneau 16 après sa mise en place. La figure 4 représente un agrandissement de la zone du système de butée 9 après la mise en place de l'écran 15 sur le support 2. L'écran 15 comprend un panneau 16 en verre sur lequel un film adhésif de polarisation doit être appliqué. L'écran comprend également un deuxième panneau de verre 17 muni d'un film de polarisation 18. L'écran 15 repose sur le support 2 par l'intermédiaire du film de polarisation 18. Un bord axial des panneaux 16 et16 from which a previous polarization film has been removed. The panel 16 is held in position by any suitable means. One can for example use the suction device described above to achieve an air depression at the receiving surface of the support 2 on which the screen is arranged. It is preferable to check the cleanliness of the panel 16 after its installation. FIG. 4 represents an enlargement of the zone of the stop system 9 after the positioning of the screen 15 on the support 2. The screen 15 comprises a glass panel 16 on which an adhesive polarization film must be applied. The screen also includes a second glass panel 17 provided with a polarization film 18. The screen 15 rests on the support 2 by means of the polarization film 18. An axial edge of the panels 16 and
17 est en appui contre la butée 12, de façon à assurer leur positionnement précis. La butée 13 est mise en place. La butée 13 surplombe les panneaux 16 et 17 et affleure au panneau 16.17 is in abutment against the stop 12, so as to ensure their precise positioning. The stop 13 is put in place. The stop 13 overhangs the panels 16 and 17 and is flush with the panel 16.
Dans le cas où l'on aurait préalablement écarté l'ensemble formé du rouleau 3 et du support 4 par rapport au support 2, on rapproche cet ensemble du bord du panneau 16 sur lequel on souhaite initier l'application.In the event that the assembly formed by the roller 3 and the support 4 has previously been removed from the support 2, this assembly is brought closer to the edge of the panel 16 on which it is desired to initiate the application.
On dispose notamment le rouleau 3 au -dessus de la zone initiale d'application. Dans le cas où le positionnement initial de l'ensemble est automatisé avec un entraînement motorisé, on peut régler une butée axiale pour interrompre l'entraînement de l'ensemble à cette position initiale. Dans l'exemple illustré, on règle la position d'un interrupteur axial 23, sur lequel le portique vient buter pour interrompre l'entraînement de rapprochement.There is in particular the roller 3 above the area initial application. In the case where the initial positioning of the assembly is automated with a motorized drive, an axial stop can be adjusted to interrupt the drive of the assembly to this initial position. In the example illustrated, the position of an axial switch 23 is adjusted, on which the gantry abuts to interrupt the reconciliation drive.
Dans une autre étape du procédé, de préférence après avoir rapproché l'ensemble de la zone d'application initiale, on initie la séparation de l'extrémité avant du film composite 8. Les bords avant du film adhésif 81 et du film de protection 82 sont ainsi séparés. On fait défiler la boucle sur le support 4. Le bord avant du film adhésif 81 est ainsi rapproché de sa zone d'application initiale sur le panneau 16. Simultanément au rapprochement, l'extrémité arrière du film composite 8 est déplacée et le lien 5 entraîne ainsi la partie du film de protection 82 retirée sous le support 4.In another step of the process, preferably after having brought the whole of the initial application area closer together, the separation of the front end of the composite film 8 is initiated. The front edges of the adhesive film 81 and the protective film 82 are thus separated. The loop is made to run on the support 4. The front edge of the adhesive film 81 is thus brought closer to its initial area of application on the panel 16. Simultaneously with the bringing together, the rear end of the composite film 8 is moved and the link 5 thus drives the part of the protective film 82 removed under the support 4.
Le bord avant du film adhésif 81 est amené en contact avec le panneau 16, comme cela est illustré aux figures 5 et 6. Le bord avant du film adhésif 81 est par exemple amené en contact avec la butée 13 afin d'assurer son positionnement adéquat par rapport au panneau 16. Comme on peut le distinguer plus précisément à la figure 6, seule la portion du film adhésif 81 située entre l'extrémité du support 4 et la zone d'application avec le panneau 16 est découverte. Le risque d'inclusion de poussières est ainsi limité.The front edge of the adhesive film 81 is brought into contact with the panel 16, as illustrated in FIGS. 5 and 6. The front edge of the adhesive film 81 is for example brought into contact with the stop 13 in order to ensure its adequate positioning with respect to the panel 16. As can be seen more precisely in FIG. 6, only the portion of the adhesive film 81 situated between the end of the support 4 and the area of application with the panel 16 is uncovered. The risk of inclusion of dust is thus limited.
Le rouleau 3 est ensuite amené en contact avec le film adhésif 81, afin d'exercer un effort d'application du film adhésif 81 sur le panneau 16. Dès lors, le rouleau va également maintenir la partie du film adhésif appliquée en position sur le panneau 16. Cette position du rouleau est mieux illustrée à la figure 7. La figure 7 montre également le placement d'un circuit de commande 20 de l'écran 15 dans un retrait 10 décrit précédemment. On translate ensuite axialement l'ensemble comprenant le rouleau 3 et le support 4, afin de poursuivre l'application du film adhésif 81 sur le panneau 16. La partie appliquée du film adhésif 81 est maintenue en place sur le panneau 16 par le rouleau 3, le support 4 entraîne le film composite en translation. Le déplacement de l'ensemble aboutit ainsi simultanément à l'application du film adhésif, à la séparation progressive entre le film adhésif 81 et le film de protection 82, ainsi qu'à l'entraînement progressif du film de protection 82 séparé suivant la boucle. Durant la translation axiale de l'ensemble, du fait de la boucle formée, la vitesse de la zone d'application du film adhésif 81 est sensiblement identique à la vitesse de séparation du film composite 8. La zone découverte du film adhésif reste donc sensiblement constante. Le procédé est donc réalisé avec une structure relativement simple, tout en limitant la zone du film adhésif 81 susceptible de recevoir des poussières à une zone sensiblement constante.The roller 3 is then brought into contact with the adhesive film 81, in order to exert a force for applying the adhesive film 81 to the panel 16. Consequently, the roller will also maintain the part of the adhesive film applied in position on the panel 16. This position of the roller is better illustrated in FIG. 7. FIG. 7 also shows the placement of a control circuit 20 of the screen 15 in a recess 10 described previously. The assembly comprising the roller 3 and the support 4 is then axially translated, in order to continue the application of the adhesive film 81 to the panel 16. The applied portion of the adhesive film 81 is held in place on the panel 16 by the roller 3 , the support 4 drives the composite film in translation. The displacement of the assembly thus results simultaneously in the application of the adhesive film, in the gradual separation between the adhesive film 81 and the protective film 82, as well as in the progressive entrainment of the protective film 82 separated along the loop . During the axial translation of the assembly, due to the loop formed, the speed of the area of application of the adhesive film 81 is substantially identical to the speed of separation of the composite film 8. The exposed area of the adhesive film therefore remains substantially constant. The process is therefore carried out with a relatively simple structure, while limiting the area of the adhesive film 81 capable of receiving dust to a substantially constant area.
La translation de l'ensemble lors de l'application du film adhésif est de préférence réalisée avec une vitesse axiale inférieure à 50 mm/s, afin de garantir de bonnes conditions d'application. Le cas échéant, l'ensemble motorisé atteint sa position de butée, et l'entraînement en translation axiale est interrompu. Le rouleau 3 peut alors être relevé, puis le panneau ou l'élément comprenant le panneau peuvent être retirés du support 2. Le procédé et le dispositif selon l'invention peuvent être utilisés aussi bien pour la réparation d'écrans à cristaux liquides sur une ligne de fabrication que pour la réparation d'écrans à cristaux liquides usagés. Ils peuvent également être utilisés pour des films adhésifs tels que des films à microprisme. The translation of the assembly during the application of the adhesive film is preferably carried out with an axial speed of less than 50 mm / s, in order to guarantee good application conditions. If necessary, the motorized assembly reaches its stop position, and the drive in axial translation is interrupted. The roller 3 can then be raised, then the panel or the element comprising the panel can be removed from the support 2. The method and the device according to the invention can be used both for repairing liquid crystal screens on a manufacturing line for repairing used liquid crystal displays. They can also be used for adhesive films such as microprism films.

Claims

REVENDICATIONS
1. Dispositif d'application (1), sur un panneau plan (16), tel qu'un panneau de verre, d'un film adhésif1. Application device (1), on a flat panel (16), such as a glass panel, with an adhesive film
(81) appartenant initialement à un film composite (8) formé de ce film adhésif (81) et d'un film de protection (82) recouvrant une face adhesive de ce film adhésif, ce dispositif comprenant: -un support (2) pour maintenir le panneau, et(81) initially belonging to a composite film (8) formed from this adhesive film (81) and from a protective film (82) covering an adhesive face of this adhesive film, this device comprising: a support (2) for maintain the panel, and
-un rouleau (3) pour appliquer le film adhésif sur le panneau maintenu sur le support, le rouleau étant axialement mobile au-dessus du support de panneau, caractérisé en ce qu'il comprend en outre: -un support mobile (4) de film composite, solidaire du rouleau dans ses déplacements axiaux;a roller (3) for applying the adhesive film to the panel held on the support, the roller being axially movable above the panel support, characterized in that it further comprises: -a movable support (4) of composite film, integral with the roller in its axial displacements;
-un lien souple (5) muni d'un premier et d'un second points de fixation (6,7), le film de protection se raccordant sur les premier et second points de fixation pour former avec le lien une boucle autour du support de film.-a flexible link (5) provided with first and second attachment points (6,7), the protective film being connected to the first and second attachment points to form a loop around the support with the link of movie.
2. Dispositif d'application selon la revendication 1, caractérisé en ce que le support de film présente une surface de réception de film (41) plane, la surface présentant une inclinaison comprise entre 5° et 45° par rapport au support de panneau.2. Application device according to claim 1, characterized in that the film support has a flat film receiving surface (41), the surface having an inclination between 5 ° and 45 ° relative to the panel support.
3. Dispositif d'application selon la revendication 1 ou 2, caractérisé en ce que le support de panneau présente une surface de réception de panneau (2) sensiblement rectangulaire, et en ce qu'un retrait (10) apte à recevoir un circuit de commande d'un écran à cristaux liquides est ménagé le long d'un bord de la surface de réception.3. Application device according to claim 1 or 2, characterized in that the panel support has a panel receiving surface (2) substantially rectangular, and in that a recess (10) capable of receiving a circuit screen control liquid crystal is formed along an edge of the receiving surface.
4. Dispositif selon l'une quelconque des revendications précédentes, caractérisé en ce qu'il comprend plusieurs supports de panneau interchangeables.4. Device according to any one of the preceding claims, characterized in that it comprises several interchangeable panel supports.
5. Dispositif selon l'une quelconque des revendications précédentes, caractérisé en ce que : -le support de panneau (2) présente une surface de réception de panneau et des conduits (14) débouchant sur la surface de réception;5. Device according to any one of the preceding claims, characterized in that: the panel support (2) has a panel receiving surface and conduits (14) opening onto the receiving surface;
-le dispositif présente en outre un organe d'aspiration relié aux conduits et susceptible de maintenir un panneau en position sur le support de panneau.the device also has a suction member connected to the conduits and capable of holding a panel in position on the panel support.
6. Dispositif selon l'une quelconque des revendications précédentes, caractérisé en ce qu'il comprend en outre:6. Device according to any one of the preceding claims, characterized in that it further comprises:
-une butée axiale de panneau (9) disposée à une extrémité axiale du support de panneau; -une butée axiale de film adhésif (13) , disposée sur la butée axiale de panneau, et faisant saillie en direction du support de panneau par rapport à la butée axiale de panneau.an axial panel stop (9) disposed at an axial end of the panel support; an axial stop of adhesive film (13), disposed on the axial stop of the panel, and projecting in the direction of the panel support with respect to the axial stop of the panel.
7. Dispositif selon la revendication 6, caractérisé en ce que la butée axiale du film adhésif présente une épaisseur inférieure ou égale à l'épaisseur du film adhésif à appliquer.7. Device according to claim 6, characterized in that the axial stop of the adhesive film has a thickness less than or equal to the thickness of the adhesive film to be applied.
8. Dispositif selon l'une quelconque des revendications précédentes, caractérisé en ce que le rouleau et le support de film sont entraînés en translation axiale par un motoréducteur (11) . 8. Device according to any one of the preceding claims, characterized in that the roller and the film support are driven in axial translation by a geared motor (11).
9. Dispositif selon l'une quelconque des revendications précédentes, caractérisé en ce que la distance entre le rouleau (3) et une extrémité du support de film est inférieure à 100 mm et de préférence la plus petite possible.9. Device according to any one of the preceding claims, characterized in that the distance between the roller (3) and one end of the film support is less than 100 mm and preferably as small as possible.
10. Procédé d'application suivant un axe sur un panneau plan, tel qu'un panneau de verre, d'un film adhésif (81) appartenant initialement à un film composite (8) formé de ce film adhésif et d'un film de protection recouvrant une face adhesive de ce film adhésif, comprenant les étapes de:10. A method of applying along an axis on a flat panel, such as a glass panel, an adhesive film (81) initially belonging to a composite film (8) formed of this adhesive film and a film of protection covering an adhesive face of this adhesive film, comprising the steps of:
-formation d'une boucle autour d'un support du film (4) composite par raccordement des extrémités du film de protection à des points de fixation (6,7) d'un lien souple (5);forming a loop around a support for the composite film (4) by connecting the ends of the protective film to fixing points (6,7) of a flexible link (5);
-séparation du film adhésif et du film de protection sur un bord du film composite; -application du bord du film adhésif séparé sur le panneau;separation of the adhesive film and the protective film on one edge of the composite film; -application of the edge of the separate adhesive film on the panel;
-déplacement axial identique du support de film composite et de la zone d'application du reste du film adhésif.- identical axial displacement of the composite film support and of the application area of the rest of the adhesive film.
11. Procédé selon la revendication 10, caractérisé en ce que le panneau de verre appartient à un écran à cristaux liquides, en ce que le film adhésif est un film de polarisation, et en ce que le procédé comprend en outre une étape de décollement d'un ancien film de polarisation du panneau avant l'étape d'application.11. The method of claim 10, characterized in that the glass panel belongs to a liquid crystal screen, in that the adhesive film is a polarization film, and in that the method further comprises a step of peeling off. '' an old polarization film of the panel before the application step.
12. Procédé selon la revendication 11, caractérisé en ce qu'il comprend en outre une étape de maintien d'un circuit de commande de l'écran à cristaux liquides dans un retrait durant l'application du film de polarisation.12. The method of claim 11, characterized in that it further comprises a step of maintaining a control circuit of the liquid crystal screen in a shrinkage during the application of the polarization film.
13. Procédé selon l'une quelconque des revendications 10 à 12, caractérisé en ce qu'il comprend en outre une étape de placement du film composite avec une inclinaison comprise entre 5° et 45° par rapport au panneau, avant l'étape d'application.13. Method according to any one of claims 10 to 12, characterized in that it further comprises a step of placing the composite film with an inclination between 5 ° and 45 ° relative to the panel, before step d 'application.
14. Procédé selon l'une quelconque des revendications 10 à 13, caractérisé en ce qu'il comprend en outre l'étape de maintien axial du panneau, et en ce que le bord adhésif séparé est mis en butée axiale contre le panneau de façon à ne pas appliquer ultérieurement le film adhésif sur une partie du panneau délimitée par la zone de mise en butée.14. Method according to any one of claims 10 to 13, characterized in that it further comprises the step of axially holding the panel, and in that the separate adhesive edge is brought into axial abutment against the panel so not to apply the adhesive film subsequently to a part of the panel delimited by the abutment zone.
15. Procédé selon l'une quelconque des revendications 10 à 14, caractérisé en ce que la distance entre la zone d'application du film adhésif et la zone de séparation reste inférieure à 100mm. 15. Method according to any one of claims 10 to 14, characterized in that the distance between the area of application of the adhesive film and the separation area remains less than 100mm.
PCT/FR2004/000128 2003-01-22 2004-01-21 Device for applying an adhesive film to a flat panel and associated application method WO2004067267A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0300679A FR2850058B1 (en) 2003-01-22 2003-01-22 APPARATUS FOR APPLYING PLANAR PANEL ADHESIVE FILM AND APPLICATION METHOD
FR03/00679 2003-01-22

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WO2021221877A1 (en) * 2020-04-30 2021-11-04 Carbon, Inc. Film applicator apparatus for additive manufacturing build platforms and related systems

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DE19606395C1 (en) * 1996-02-21 1997-10-09 Fraunhofer Ges Forschung Automatic application of protective sheet to painted car surface
JPH1034476A (en) * 1996-07-18 1998-02-10 Nec Eng Ltd Sheet sticking device
JPH11185619A (en) * 1997-12-25 1999-07-09 Sony Corp Affixing method of functional film of cathode-ray tube and affixing device

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DE19606395C1 (en) * 1996-02-21 1997-10-09 Fraunhofer Ges Forschung Automatic application of protective sheet to painted car surface
JPH1034476A (en) * 1996-07-18 1998-02-10 Nec Eng Ltd Sheet sticking device
JPH11185619A (en) * 1997-12-25 1999-07-09 Sony Corp Affixing method of functional film of cathode-ray tube and affixing device

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