JP2007065252A - Method for sticking film and device thereof - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To stick a film cleanly, while reducing engaging of very small foreign matters and air bubbles during the sticking, when the film is stuck on a specified stuck surface with an adhesive. <P>SOLUTION: When the film (e.g. a polarizing film) is stuck-on on the stuck surface (e.g. a liquid crystal display panel) 1 with the adhesive, both ends 2a and 2a of the film 2 are sucked under negative pressure (Figs. 4(a), 4(b)), a suction head 20 is moved to a specified height position above the stuck surface 1 (Fig. 4(c)), and a pressure plate 31, arranged at the center in an opening part 21 and press rollers 32 and 32 on both sides of it are lowered to press the center part of the film 2 against the stuck surface 1 (Fig. 4(d)). Then the press rollers 32 and 32 are moved toward suction parts 22 and 22, to stick the film 2 on the stuck-on surface 1 (Fig. 4(f)). <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a method for sticking a film and an apparatus therefor, and more specifically, to a technique for preventing foreign matter and bubbles from entering as much as possible when a film is stuck on a flat adherend surface. is there.

  As one of the scenes where the film is attached, there is a case where a polarizing film or a retardation film is attached to the display surface of the liquid crystal display panel. This type of film is preliminarily coated with an adhesive material on one surface, and a pressure roller is used for the sticking as described in Patent Document 1, for example.

  The conventional example will be described with reference to FIG. 5. When the polarizing film 2 is attached to the liquid crystal display panel 1, instead of attaching the entire surface of the polarizing film 2 at one time, first, one end side of the polarizing film 2 is attached. After the end side is held in a state where it is lifted with an appropriate tension by a jig (not shown), the pressing roller 3 is moved while being pressed from one end side to the other end side of the polarizing film 2, and the polarizing film 2 is moved. Can be attached to the liquid crystal display panel 1.

JP 2003-161935 A (FIGS. 2 to 4)

  According to the conventional example, the polarizing film 2 can be neatly adhered without causing wrinkles. By the way, when the polarizing film 2 has a vertically long size, it is usually attached from one end side in the length direction. This is because the tension is easily applied uniformly when the other end of the polarizing film 2 is held in a floating state.

  However, when the vertically long polarizing film 2 is attached from one end side in the length direction, the distance to which the pressing roller 3 is moved becomes longer, and accordingly, minute foreign substances and bubbles are easily caught during the attachment. .

  In order to reduce the biting of minute foreign matters and bubbles during the pasting, the vertically long polarizing film 2 may be pasted from one end side to the other end side in the width direction. This causes another problem that it is difficult to hold the wide end portion on the other end side with a uniform tension.

  Such a problem is not only a film whose one surface is an adhesive surface, such as the polarizing film described above, but also an adhesive material is applied to the film side or the adherend surface side, and the pressure roller is moved to move one end of the film. This also occurs in the case of affixing sequentially from the side toward the other end.

  Therefore, the problem of the present invention is that when a film is attached to a predetermined surface to be attached via an adhesive, the film can be attached cleanly by minimizing the biting of minute foreign matters and bubbles during the attachment. There is in doing so.

  In order to solve the above-mentioned problem, the invention according to claim 1 is a method for adhering a film for adhering a film to a surface to be adhered via an adhesive material. A suction head that can be lifted and lowered between the suction portions, a pressing plate that can be lifted and disposed in the center of the opening, and both sides of the pressing plate, With a pair of left and right pressing rollers that can move up and down with the pressing plate and move from the pressing plate toward the suction head side, the pressing plate and the pressing rollers are raised from the bottom surface of the opening, After suctioning both ends of the film at the suction portions and moving the suction head to a predetermined height position on the adherend surface, the pressing plate and the pressing rollers are lowered. Center of the film The pressed against the wear surface bonded the above, then, the respective pressing rollers is moved toward the suction side, and the film is characterized by pasting the wear surface bonded the above.

  According to a second aspect of the present invention, in the first aspect, when the pressure rollers are passed under the suction portion, the distance between the suction surface of the suction portion and the adherend surface is the pressure. The suction head is raised so as to be equal to or larger than the diameter of the roller.

  According to a third aspect of the present invention, in the first or second aspect, when the film is a rectangle including a long side and a short side, both the long-side ends of the film are sucked and held by the sucking portions. It is characterized by doing.

  The invention described in claim 4 is a film sticking apparatus for sticking a film to a sticking surface via an adhesive material, and has a pair of left and right suction parts for negative pressure suction at both ends of the film, A suction head that can be moved up and down between the parts, a pressing plate that can be moved up and down disposed in the center of the opening, and disposed on both sides of the pressing plate, and moves up and down together with the pressing plate and the above It is characterized by comprising a pair of left and right pressing rollers movable from the pressing plate toward the suction head side.

  According to a fifth aspect of the present invention, in the fourth aspect of the invention, the pressing plate includes skirts having a substantially trumpet shape in cross section having substantially the same curvature as the outer peripheral surface of the pressing roller on both side surfaces on the lower end side. It is said.

  According to the first aspect of the present invention, the suction portions on both the left and right sides of the suction head are negatively suctioned at both ends of the film, and the suction head is moved to a predetermined height position on the adherend surface. After that, the pressing plate and the pressing rollers arranged at the center in the opening are lowered to press the central portion of the film against the adherend surface, and then the pressing rollers are moved to the suction portion. By moving it toward the side and sticking the film to the adherend surface, the sticking distance to the adherend surface is the distance from the center part to the end, and the conventional example It becomes almost half of the sticking distance from one end to the other end. Therefore, the opportunity to bite in a minute foreign object or bubble during the pasting is halved.

  When the pressure rollers are passed under the suction portion, the suction head is raised so that the distance between the suction surface of the suction portion and the adherend surface is equal to or larger than the diameter of the pressure rollers. According to the second aspect of the present invention, the film can be neatly adhered to the end of the film.

  According to the invention of claim 3, wherein when the film is a rectangle including a long side and a short side, both ends on the long side of the film are sucked and held by the suction portions. The attachment distance with respect to the to-be-adhered surface by can be made shorter.

  According to the film sticking apparatus of the invention described in claim 4, the film can be moved up and down having a pair of left and right adsorbing portions that adsorb both ends of the film under negative pressure, and an opening between the adsorbing portions. A suction head, a pressing plate that can be moved up and down arranged in the center of the opening, and arranged on both sides of the pressing plate, and can move up and down with the pressing plate and move from the pressing plate toward the suction head side. By providing such a pair of right and left pressing rollers, the film sticking method according to the invention of claim 1 can be easily carried out.

  The press plate and the press according to the invention according to claim 5, wherein a hem portion having a substantially trumpet cross section having substantially the same curvature as the outer peripheral surface of the press roller is formed on both side surfaces on the lower end side of the press plate. There is no gap between the roller and the central portion of the film can be securely adhered to the adherend surface.

  Next, an embodiment of the present invention will be described with reference to FIGS. 1 to 4, but the present invention is not limited to this. 1 is a sectional view schematically showing a film sticking apparatus according to the present invention, FIG. 2 is a plan view thereof, FIG. 3 is a sectional view schematically showing a pressing portion provided in the present invention, and FIGS. f) It is explanatory drawing which shows the procedure which adheres a film to a to-be-adhered surface. In the description of this embodiment, the film is a polarizing film, and the adherend surface is a display surface of a liquid crystal display panel.

  As shown in FIG. 1 and FIG. 2, the film sticking apparatus 10 according to the present invention presses the polarizing film 2 against the display surface of the liquid crystal display panel 1 shown in FIG. And a pressing portion 30 to be attached.

  The suction head 20 is configured as a frame-like body including a pair of left and right suction portions 22, 22 disposed so as to be positioned on both ends 2 a, 2 a of the polarizing film 2, and an opening 21 is provided between the suction portions 22, 22. Is provided. The suction head 20 is movable at least in the vertical direction by a driving means (not shown).

  Each of the adsorbing portions 22 and 22 has a large number of adsorbing holes (not shown) extending from the bottom surface (adsorbing surface) 22a to the upper surface 22b. Both of them are connected to each other. Each adsorption | suction part 22 and 22 may be formed from the air permeable resin block which has an open cell.

  The pressing unit 30 includes a pressing plate 31 and a pair of pressing rollers 32 and 32 disposed along both side surfaces of the pressing plate 31. The pressing plate 31 can be moved in the vertical direction by a driving means (not shown), and is arranged at the central position of the opening 21 so as to be parallel to the suction portions 22 and 22.

  The pressing rollers 32 and 32 are also arranged in parallel to the suction portions 22 and 22. The pressing plate 31 and each pressing roller 32 have a length longer than the width of the polarizing film 2. The plate thickness of the pressing plate 31 and the diameter of each pressing roller 32 may be appropriately selected.

  The pressing rollers 32, 32 can be moved in the left-right direction by a roller driving means (not shown). However, when the pressing rollers 32 are in contact with both side surfaces of the pressing plate 31, as shown in FIG. It is movable. When the pressing rollers 32, 32 are in contact with both side surfaces of the pressing plate 31, their lower surfaces (pressing action surfaces) 32 a are aligned on a plane L including the bottom surface 31 a of the pressing plate 31.

  The pressing plate 31 is preferably made of an elastic body such as urethane resin, for example. As shown in FIG. 3A, the bottom surface 31a of the pressing plate 31 may have the same thickness as that of the pressing plate 31. However, in this state, since there is a gap between the bottom surface 31 a of the pressing plate 31 and the pressing rollers 32, 32, a portion (dead angle) that cannot be pressed by the pressing portion 30 occurs at the central portion of the polarizing film 2.

  Therefore, as shown in FIG. 3B, hem portions 311, 311 that spread in a cross-sectional trumpet shape with substantially the same curvature as the outer peripheral surfaces of the pressing rollers 32, 32 can be formed on both side surfaces on the lower end side of the pressing plate 31. Preferably, according to this, there is no gap between the pressing plate 31 and the pressing rollers 32, 32, and the central portion of the polarizing film 2 can be securely adhered to the adherend surface.

  Next, an example of a film sticking method by the film sticking apparatus 10 will be described with reference to FIGS. The polarizing film 2 has an adhesive surface on one surface, and a separator (release paper) (not shown) is attached to the adhesive surface. A protective cover film (not shown) is attached to the other surface of the polarizing film 2.

  First, as shown in FIG. 4 (a), the polarizing film 2 is placed on a suitable flat support base A with the separator side as the bottom surface, and the suction portions 22, 22 of the suction head 20 are placed on both ends 2a, 2a. After mounting, the polarizing film 2 is adsorbed by setting the adsorbing portions 22 and 22 to a negative pressure adsorbing state by a negative pressure source. At this time, the pressing portion 30 is held at a position higher than the bottom surface of the opening portion 21 so as not to contact the polarizing film 2.

  Next, as shown in FIG. 4 (b), the suction head 20 is moved upward to peel off the separator from the lower surface of the polarizing film 2, and then the suction head 20 is covered as shown in FIG. 4 (c). It moves on the display surface 1a of the liquid crystal display panel 1 which is a sticking surface, and hold | maintains the polarizing film 2 in the position which floated about 1 mm, for example from the display surface 1a. The liquid crystal display panel 1 side may be moved to the bottom surface side of the suction head 20.

  Next, as shown in FIG. 4 (d), after the pressing portion 30 is lowered and the central portion of the polarizing film 2 is pressed against the display surface 1 a of the liquid crystal display panel 1 by the pressing plate 31 and the pressing rollers 32 and 32. 4 (e), the pressing rollers 32 and 32 are moved while being pressed from the central portion of the polarizing film 2 toward the both end portions 2a and 2a. It is preferable to roll the pressing rollers 32 when moving the roller. However, depending on the case, the pressing rollers 32 may be moved without rubbing.

  When the pressing rollers 32 and 32 approach the suction portions 22 and 22, preferably, the negative pressure suction of the suction portions 22 and 22 is canceled, and as shown in FIG. 4 (f), the suction head 20 exceeds the roller diameter. The pressure rollers 32 and 32 are moved up to below the suction portions 22 and 22 to stick the entire surface of the polarizing film 2 to the display surface 1 a of the liquid crystal display panel 1.

  In addition, if the diameter of the press rollers 32 and 32 is small and the press rollers 32 and 32 can pass under the adsorption | suction part 22 and 22 with the space | interval at the time of positioning of FIG.4 (c), if FIG. As in f), it is not necessary to raise the suction head 20.

  Further, although depending on the negative pressure suction force of the suction portions 22 and 22, the pressure rollers 32 and 32 are moved to below the suction portions 22 and 22 without releasing the negative pressure suction force, and the polarizing film 2. The end portions 2a, 2a may be forcibly removed from the suction portions 22, 22.

  As described above, the polarizing film 2 is attached to the display surface 1a of the liquid crystal display panel 1 which is the adherend surface through the adhesive surface. According to the present invention, the polarizing film 2 is attached to the adherend surface. The sticking distance of the polarizing film 2 is a distance from the center portion to the end 2a, and is almost half of the sticking distance from one end to the other end of the conventional example described above. Therefore, the chance of biting in foreign matter or bubbles during the pasting is halved.

  Further, when the central portion of the polarizing film 2 is pressed against the adherend surface, skirt portions 311 and 311 having a cross-sectional trumpet shape are formed on the lower end side of the pressing plate 31, and the outer peripheral surfaces of the pressing plate 31 and the pressing rollers 32 and 32. By eliminating the gap between the two, it is possible to prevent biting of minute foreign matters and bubbles at the beginning of the attachment. Moreover, when the polarizing film 2 is a rectangle, the adhesion distance with respect to the to-be-adhered surface of a film can be shortened by adsorb | sucking the long side in the adsorption | suction part 22 and 22.

  As described above, the present invention has been described by taking the polarizing film whose one surface is an adhesive surface as an example. However, in the field of liquid crystal display elements, the film to be adhered may be a retardation film, a color film, or the like. Moreover, in the said embodiment, although comprised as a frame-like body containing a pair of adsorption | suction part which arrange | positioned the adsorption | suction head facing each other, the structure which made each adsorption | suction part movable individually is also included in this invention. .

  Furthermore, the present invention can be applied to other fields. In that case, as a film to be adhered, not only a film having one surface of an adhesive surface such as the polarizing film described above, but also the film side or the covered surface. It may be a film to be applied by applying a sticking material to the sticking surface. In addition, the surface to be adhered is not necessarily a flat surface, and a film can be adhered according to the present invention even if it is a curved surface.

Sectional drawing which shows the film sticking apparatus which concerns on this invention typically. The top view of FIG. Sectional drawing which shows typically the press part with which this invention is provided. (A)-(f) The schematic diagram for demonstrating an example of the procedure which adheres a film to a to-be-adhered surface by this invention. The perspective view which shows a prior art example typically.

Explanation of symbols

1 Liquid crystal display panel 1a Display surface (sticking surface)
DESCRIPTION OF SYMBOLS 2 Polarizing film 2a End part 10 Film sticking apparatus 20 Adsorption head 21 Opening part 22 Adsorption part 22a Lower surface (adsorption surface)
22b Upper surface 30 Pressing portion 31 Pressing plate 311 Bottom portion 31a Bottom surface 32 Pressing roller

Claims (5)

In the method of sticking the film to stick the film to the adherend surface via an adhesive material,
A liftable suction head having a pair of left and right suction parts that adsorbs both ends of the film at a negative pressure, and an opening between the suction parts, and a liftable pressure disposed at the center in the opening A plate and a pair of left and right pressing rollers that are arranged on both sides of the pressing plate, move up and down together with the pressing plate, and move from the pressing plate toward the suction head side,
In a state where the pressing plate and the pressing rollers are raised from the bottom surface of the opening, the suction portions are negatively sucked at both ends of the suction portion, and the suction head is fixed on the surface to be bonded. After moving to the height position, the pressing plate and the pressing rollers are lowered to press the central portion of the film against the surface to be adhered, and then the pressing rollers are moved toward the suction portion side. And attaching the film to the adherend surface.   When passing each pressing roller below the suction portion, the suction head is raised so that the distance between the suction surface of the suction portion and the adherend surface is equal to or larger than the diameter of each pressure roller. The film sticking method according to claim 1.   When the film is a rectangle including a long side and a short side, both ends on the long side of the film are sucked and held by each of the suction portions. The film sticking according to claim 1 or 2, How to wear. In the film sticking apparatus for sticking the film to the sticking surface via an adhesive material,
A liftable suction head having a pair of left and right suction portions that adsorb both ends of the film under negative pressure, and an opening between the suction portions, and a liftable pressure disposed in the center of the opening And a pair of left and right pressing rollers which are arranged on both sides of the pressing plate, move up and down together with the pressing plate, and move from the pressing plate toward the suction head side. Sticking device.   The film pressing apparatus according to claim 4, wherein the pressing plate includes skirts having a substantially trumpet cross section having substantially the same curvature as the outer peripheral surface of the pressing roller on both side surfaces on the lower end side.

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