JP4901628B2 - Film peeling method and film peeling apparatus - Google Patents

Description

  The present invention relates to a film peeling method and a film peeling apparatus. More specifically, the present invention relates to a film peeling method and a film peeling apparatus for peeling a film, particularly a polarizing plate, of an electro-optical panel such as a liquid crystal display panel.

  In general, a liquid crystal display panel is manufactured by sealing a liquid crystal material between two hard glass substrates and then bonding a film-like polarizing plate to the front and back surfaces of the glass substrate. The polarizing plate is a material for controlling (polarizing) light from a backlight as a light source, and usually a protective laminate is attached to the surface of the polarizing plate in order to protect the polarizing plate itself. After the production of the liquid crystal display panel, in the appearance inspection and lighting inspection, problems such as contamination and damage on the surface of the polarizing plate / protective laminate and air mixing into the gap between the polarizing plate and the glass substrate are found. In such a case, it is necessary to peel off the polarizing plate, and various film peeling treatment techniques have been proposed.

For example, Patent Document 1 below discloses an adhesive film peeling method and apparatus. According to this disclosure, a part of the peeled polarizing plate is held by the film winding roller (peeling roller 8), and then the film fixing type winding roller is rotated in the winding direction to wind the film. During film winding, the liquid crystal display panel moves together with a stage (panel set stage 1) on which the liquid crystal display panel is placed in a peeling direction substantially perpendicular to the long film winding roller.
Also known is a film peeling treatment technique in which the object to be peeled is not a polarizing plate but a protective laminate attached to the surface of the polarizing plate (see Patent Document 2 below). In this film peeling method, the film can be wound while being moved in the peeling direction (downstream side) while rotating the film winding roller (peeling roller 17).

However, since the technique disclosed in Patent Literature 1 peels the film while moving the liquid crystal display panel, the peeling device becomes larger than the technology of the liquid crystal display panel / fixed type (Patent Literature 2). Inevitable. In particular, in the peeling technique for processing a large-screen liquid crystal display panel, the peeling apparatus becomes very large, and this problem is a fatal defect.
On the other hand, the method for peeling off the protective laminate disclosed in Patent Document 2 is satisfactory to some extent for the downsizing of the peeling device, but the liquid crystal display panel (polarizing plate 10) is fixed to the stage (Patent Document 2, Paragraph No. 0009), this known method cannot be applied to the polarizing plate peeling technique as it is. That is, if the polarizing plate is peeled off while rotating / moving the film take-up roller while the liquid crystal display panel is fixed, the polarizing plate is broken during the peeling treatment, and the winding treatment becomes impossible. It was found that the glass substrate of the liquid crystal display panel was damaged.

Japanese Patent Laid-Open No. 10-282463 Japanese Patent Laid-Open No. 9-267423

  An object of the present invention is to achieve downsizing of a film peeling apparatus in view of the above-mentioned problems, and at the same time, an electro-optical panel (for example, a film such as a polarizing plate of a liquid crystal display panel, or a hard substrate to which this film is attached Etc.) and a method and apparatus for peeling the film without damaging the film.

  As a result of intensive studies to solve the above-mentioned problems, the inventors of the present invention have not only rotated / moved the take-up roller but also strongly fixed such as fixing by an adsorption fixing method or a mold while peeling the film from the hard substrate. It is found that the above problem can be achieved by placing the electro-optical panel on the stage in a state that can vibrate in the vertical direction and in a state that can vibrate in the horizontal direction regardless of the method, and the present invention is completed based on this knowledge. It came to.

  That is, the present invention is a film peeling method for peeling off the film for an electro-optical panel having a hard substrate and a film bonded to the surface of the hard substrate, the edge of the film from the hard substrate And connecting the end of the peeled film to a film take-up roller, pressing the hard substrate surface portion from which the film has been peeled off by a substrate pressing blade, and the electro-optical panel via the film The film winding roller, the substrate pressing blade, and the film pressing roller are moved in the peeling direction while rotating the film winding roller in the winding direction for winding the film while holding the film by the film pressing roller. Including a peeling step of peeling the film from the hard substrate. During the peeling step, the electro-optical panel is held between the stage on which the electro-optical panel is placed and the substrate pressing blade and the film pressing roller so as to vibrate in a substantially vertical direction. Provided is a film peeling method characterized in that the film is placed on the stage so as to vibrate in a substantially horizontal direction.

Preferably, prior to either the connecting step or the peeling step, when the substrate pressing blade is installed at a predetermined position, between the substrate pressing blade and the hard substrate surface portion from which the film has been peeled off. A vertical gap is provided, and the gap corresponds to a maximum width of the vibration in the vertical direction during the peeling process.
Preferably, during the connecting step, the end of the peeled film is connected to the film take-up roller through the film pressing roller.
Preferably, the substrate pressing blade is arranged so that the surface portion of the hard substrate that can be contacted by the substrate pressing blade during the peeling step is located upstream of the film pressing roller in the peeling direction. It is characterized by.

  According to the second aspect of the present invention, there is provided the film peeling method according to the present invention, wherein the film for an electro-optical panel having a hard substrate and a film bonded to the surface of the hard substrate is peeled off. A film peeling apparatus for carrying out the invention, a film winding roller for connecting an end portion of the film peeled from the hard substrate, a substrate pressing blade for pressing a hard substrate surface portion from which the film is peeled, A film pressing roller for pressing the electro-optical panel through the film, and the film winding roller, the substrate pressing blade, and the film pressing roller when the film winding roller is rotated in the winding direction for winding the film. A moving mechanism for moving the film in the peeling direction to peel the film from the hard substrate. Example to provide a film peeling device according to claim is.

According to the film peeling method and the film peeling apparatus of the present invention, it is possible to achieve downsizing of the apparatus by rotating and moving the film take-up roller, and between the stage and the substrate pressing blade / film pressing roller during the peeling process. In this case, the electro-optical panel is placed on the stage so as to be able to vibrate in the horizontal direction while sandwiching the electro-optical panel so as to vibrate in the vertical direction, thereby increasing the degree of freedom of the behavior of the electro-optical panel. The damage of the optical panel could be substantially prevented.
That is, in the peeling process, a relatively large peeling force is required to peel off the film strongly bonded to the hard substrate, so that the electro-optical panel is firmly fixed on the stage as in the prior art. When the film is peeled off from the substrate, the film / hard substrate is damaged due to the force generated at the time of peeling. On the other hand, the force generated when the film is peeled off is given to the electro-optical panel as in the present invention. Thus, the electro-optical panel can be substantially prevented from being damaged.
The force generated at the time of peeling is due to non-uniformity of the adhesive force of the adhesive to the panel, and this force is applied to the panel from any direction such as a horizontal direction / vertical direction. It is thought to move in the direction. According to the present invention, since the degree of freedom of behavior is given to an arbitrary direction such as the horizontal / vertical direction of the panel, the force generated at the time of peeling can be relaxed / diffused. The concentrated force on the plate / hard substrate / specific part can be relaxed / diffused, and thereby the breakage of the panel can be substantially prevented.

As described above, the film peeling method of the present invention provides the film for the electro-optical panel (5) having the hard substrate (6) and the film (7) bonded to the surface of the hard substrate (6). A film peeling method for peeling (7), wherein an end portion of the film (7) is peeled off from the hard substrate (6), and an end portion of the peeled film (7) is turned into a film winding roller (73). And the surface of the hard substrate (6) from which the film (7) has been peeled off is pressed by a substrate pressing blade (32), and the electro-optical panel (5) is held via the film (7). The film winding roller while rotating the film winding roller (73) in the winding direction for winding the film (7) while being pressed by the film pressing roller (57) 73), moving the substrate pressing blade (32) and the film pressing roller (57) in the peeling direction, and peeling the film (7) from the hard substrate (6). During the peeling process, the electro-optical panel (5) is placed between the stage (2) on which the electro-optical panel (5) is placed, the substrate pressing blade (32), and the film pressing roller (57). The film peeling apparatus (1) of the present invention is characterized in that it is placed on the stage (2) so as to be able to vibrate in a substantially horizontal direction while being held so as to be vibrated in a substantially vertical direction. It is an apparatus for carrying out the film peeling method of the invention (see the attached FIGS. 1 to 6 for the reference numerals).
Here, “connect the edge of the peeled film to the film take-up roller” means that the end of the film is connected to the film take-up roller manually, semi-automatically, fully automatically, etc. with tape, etc. For example, the film winding roller may be gripped and connected to the film winding roller, or a hole may be provided at the end of the film, and the hole may be hooked and connected to the hooking portion of the film winding roller.

  Next, the present invention will be described in more detail by describing the best mode for carrying out the present invention with reference to the attached drawings. However, the present invention is not limited to these embodiments.

<Film peeling device>
FIG. 1 is a perspective view of a film peeling apparatus 1 in a use state according to an embodiment of the present invention. FIG. 2 is a plan view showing the film peeling apparatus 1 shown in FIG. 1 with a cover removed. These are partial side views which show a part of film peeling apparatus shown in FIG. 1 in the state which removed the cover.
As shown in FIG. 1, the film peeling apparatus 1 includes a peeling apparatus 4 which is a main element and other elements. Specifically, the stage 2 having a flat upper surface 2a, and the stage 2 Is provided with a rectangular parallelepiped-shaped gantry 3 and a peeling device 4 mounted on the upper surface 2a. The peeling device 4 moves on the stage 2 from the upstream side (upper side in FIG. 2) to the downstream side (lower side in FIG. 2) along the peeling direction (downward direction in FIG. 2). The polarizing plate 7 as a film is peeled off from a glass substrate 6 as a hard substrate constituting the liquid crystal display panel 5 as a device.

  In the liquid crystal display panel 5, a predetermined gap is formed between a pair of glass substrates 6 by interposing a plurality of spacers (not shown), and a liquid crystal layer is provided by injecting liquid crystal into the gap. As shown in FIG. 2, the glass substrate 6 is formed in a rectangular shape in plan view. As shown in FIG. 1, a polarizing plate 7 is attached to the upper surface of the glass substrate 6 via an adhesive layer 8. The polarizing plate 7 is formed in a rectangular shape having substantially the same size as the glass substrate 6. When a defect occurs due to air, dust, or the like interposed between the polarizing plate 7 and the glass substrate 6, the polarizing plate 7 can be peeled and removed together with the adhesive layer 8 by the film peeling apparatus 1 of the present invention.

<Stage>
As shown in FIG. 2, the stage 2 has a rectangular shape in plan view, and is arranged so that its longitudinal direction is parallel to the peeling direction (downward direction in FIG. 2). In the vicinity of both ends of the stage 2 on the left side (hereinafter referred to as “upstream left side”) and on the right side (hereinafter referred to as “upstream right side”) toward the upstream in the peeling direction, the groove 11 and the groove 12 are in the peeling direction, respectively. Along the upper surface 2a of the stage 2. In these grooves 11 and 12, the guide member 22 is slidably fitted (see FIG. 3), and the length in the peeling direction is the same. Further, a rack 13 that is located further upstream than the upstream right groove 12 and extends in the peeling direction is formed on the upper surface 2 a of the stage 2, and the rack 13 includes a pinion 94. The teeth (see FIG. 3) are engaged, and the pinion 94 rotates in a predetermined direction and in the opposite direction so that the peeling device 4 moves in the peeling direction and the non-peeling direction opposite to the peeling direction. Can do.

<Peeling device>
The peeling apparatus 4 includes a base plate 21 disposed at a predetermined interval from the upper surface 2a of the stage 2 in the vertical direction (see particularly FIG. 3).
The base plate 21 has a rectangular shape in plan view, and is arranged so that its longitudinal direction is parallel to the width direction of the stage 2 (see FIG. 2). The base plate 21 has a length in the longitudinal direction slightly shorter than the width of the stage 2, and is arranged so as to face the two grooves 11 and 12 without facing the rack 13. Two guide members 22 are formed at each position facing the grooves 11 and 12 on the lower surface of the base plate 21 (see FIG. 3). The guide member 22 protrudes from the lower surface of the base plate 21 toward the opposed grooves 11 and 12 and is slidably fitted into the grooves 11 and 12. In a state where the guide member 22 is fitted in the grooves 11 and 12, an interval larger than the thickness of the liquid crystal display panel 5 is provided so that the liquid crystal display panel 5 can be inserted between the base plate 21 and the stage 2. It is formed. A through hole 23 extending in the longitudinal direction is formed at the center of the base plate 21, and a film pressing roller 57 (see FIG. 3 for details) and a substrate pressing blade 32 are passed through the through hole 23. The liquid crystal display panel 5 can be pressed by jumping out to the stage 2 side.

  As shown in FIG. 3, main elements 31, 51, 71, 91 that mainly function when the polarizing plate 7 of the liquid crystal display panel 5 is peeled from the glass substrate 6 are provided on the base plate 21. That is, the main elements are a first pressing mechanism 31 for pressing the surface of the glass substrate 6 from which the polarizing plate 7 is peeled off together with the adhesive layer 8, and a second pressing mechanism 51 for pressing the liquid crystal display panel 5 through the polarizing plate 7, They are a winding device 71 that can be connected to the end portion of the polarizing plate 7 peeled from the glass substrate 6, and a moving mechanism 91 for moving the whole peeling device 4 in the peeling direction / non-peeling direction. Further, a cover 9 (see FIG. 1) that partially covers the first and second pressing mechanisms 31 and 51 and the winding device 71 is fixed to the base plate 21. The substrate pressing blade 32 of the first pressing mechanism 31, the film pressing roller 57 of the second pressing mechanism 51, and the film winding roller 73 of the winding device 71 are arranged in order along the peeling direction. That is, the film take-up roller 73 is positioned downstream in the peeling direction, and the film press roller 57 is disposed between the film take-up roller 73 and the substrate pressing blade 32.

<First holding mechanism>
2 and 3, the first pressing mechanism 31 includes a substrate pressing blade 32, an angle adjusting mechanism 33 that adjusts an angle formed by the substrate pressing blade 32 and the upper surface 2a of the stage 2, and a substrate pressing blade 32. And two height adjusting mechanisms 34 for adjusting the distance between the stage 2 and the stage 2. Since the height adjustment mechanism 34 has the same configuration, only one height adjustment mechanism 34 will be described below, and description of the other height adjustment mechanism 34 will be omitted.

  The substrate pressing blade 32 is made of a long plate-like member extending in the width direction of the stage 2, is inclined downward in the peeling direction, and has a tapered shape at its lower end (see FIG. 3). The substrate pressing blade 32 is fixed to a mounting portion 35 (refer to FIGS. 2 and 3 for details) of the angle adjusting mechanism 33 with bolts. The film peeling apparatus of the present invention can efficiently and effectively remove the polarizing plate 7 without using ethanol or the like for swelling or dissolving the adhesive that bonds the glass substrate 6 and the polarizing plate 7. If necessary, a fluid passage for swelling the adhesive can be formed in the substrate pressing blade 32. For example, a fluid passage that communicates the vicinity of the tapered tip 32a and the end opposite to the tip 32a can be formed. The fluid includes a liquid such as an organic solvent (for example, ethanol) and a gas such as water vapor.

  The angle adjusting mechanism 33 includes five shafts 36 that extend in the width direction of the stage 2, a support member 37 that rotatably supports the shaft 36, and a side surface that is attached to the substrate pressing blade 32 and faces the stage 2. A portion 35 and a fixing member 38 that non-rotatably fixes the shaft 36 to the support member 37 at a predetermined position with respect to the direction around the shaft.

  As shown in FIGS. 2 and 3, the support member 37 includes a pair of flanges 39 that respectively support the end portions of the shaft 36, and three connection members 41 to 43 that connect the pair of flanges 39 to each other. The latter connecting member includes a connecting member 41 fixed to the upper surface of the pair of flanges 39, a connecting member 43 fixed from the center of the lower surface of the pair of flanges 39 to the upstream end in the peeling direction, and a pair of The connecting member 42 is fixed to one side surface of the flange 39 on the upstream side in the peeling direction. The five attachment portions 35 are plate-like members fixed to the shaft 36 so as to be separated from each other along the extending direction of the shaft 36. The substrate pressing blade 32 is fixed by bolts on one side surface of the mounting portion 35 facing the stage 2. Thus, since the board | substrate holding | suppressing blade 32 is bolt-fixed, it can be replaced freely.

  The fixing member 38 is a ring having an inner diameter substantially the same as the outer diameter of the shaft 36 (FIG. 3), and is attached to the upstream right end of the shaft 36 (FIG. 2). The fixing member 38 is formed with an internal thread that can be screwed into an external thread formed at the end of the shaft 36 on the inner peripheral surface thereof. This fixing member 38 has a horizontal distance T1 (distance between the substrate pressing blade / tip 32a and the drooping point 57a of the film pressing roller 57, FIG. 6 and the following item <1.2> during the peeling process. The inclination angle of the substrate pressing blade 32 can be adjusted so that the reference can be determined. For example, the substrate pressing blade 32 and the tilt angle (the angle formed by the line parallel to the width direction of the substrate pressing blade 32 passing through the tip 32a of the substrate pressing blade 32 and the upper surface 2a of the stage 2) are 45 degrees. After that, the shaft 36 can be fixed to the flange 39 in a non-rotatable manner by tightening until the fixing member 38 comes into contact with the side surface of the flange 39, and the horizontal distance T1 is determined by this angle setting. be able to. The fixing member 38 is loosened so as to be separated from the side surface of the flange 39, whereby the shaft 36 can be rotated with respect to the flange 39.

  As shown in FIG. 3, the height adjustment mechanism 34 has an outer cylinder 44, an inner cylinder 45 that rotatably supports the outer cylinder 44 in the circumferential direction, and an L-shape fixed to the inner cylinder 45 and the connecting member 42. A bracket 46 having a shape and a spindle 47 inserted into the outer cylinder 44 and the inner cylinder 45 through a hole formed in the bracket 46 are provided.

  A continuous female screw is formed on the inner peripheral surface of the outer cylinder 44 / inner cylinder 45, and the spindle 47 is so formed that the male screw formed on the spindle 47 is screwed to the female screw formed on the outer cylinder 44 and the inner cylinder 45. Is inserted into the inner cylinder 45 and the outer cylinder 44. Further, the spindle 47 abuts a guide member 48 whose lower end is positioned below in the vertical direction, and the guide member 48 is fixed to the base plate 21 via a fixing member 49 and extends along the vertical direction (vertical direction in FIG. 3). The movement of the bracket 46 can be guided. Since the guide member 48 only guides the movement of the bracket 46 and does not specifically support the bracket 46, the upper end of the guide member 48 and the lower end of the spindle 47 are the substrate pressing blade 32, The support member 37 is always in contact with its own weight.

  This height adjustment mechanism 34 has a mechanism similar to that of a known micrometer. When the outer cylinder 44 is rotated in a predetermined direction, the spindle 47 extends so as to be pushed out of the outer cylinder 44 / inner cylinder 45, and the substrate The holding blade 32 moves away from the stage 2, that is, upward in the vertical direction. On the other hand, when the outer cylinder 44 is rotated in a direction opposite to the predetermined direction, the spindle 47 is reduced so as to enter the outer cylinder 44 / inner cylinder 45, and the substrate pressing blade 32 approaches the stage 2, that is, vertical. The tip 32 a of the substrate pressing blade 32 passes through the through hole 23 of the base plate 21 and approaches the upper surface 2 a of the stage 2. In this way, the height of the substrate pressing blade 32 can be adjusted.

<Second holding mechanism>
As shown in FIGS. 2 and 3, the second pressing mechanism 51 includes air cylinders 55 and 56 that are vertically attached to the pedestals 52 and 53 that are fixed to both ends along the longitudinal direction of the base plate 21. And a long film pressing roller 57 rotatably supported by the air cylinders 55 and 56. Each air cylinder 55, 56 supports the film pressing roller 57 at each end of its cylinder rod so that the longitudinal direction of the film pressing roller 57 is parallel to the width direction of the stage 2.

  With this configuration, when the cylinder rods of the air cylinders 55 and 56 are extended, the film pressing roller 57 approaches the stage 2, whereby the film pressing roller 57 passes through the through hole 23 of the base plate 21 and the upper surface of the stage 2. 2a. On the other hand, when the cylinder rods of the air cylinders 55 and 56 are reduced, the film pressing roller 57 moves in a direction away from the stage 2, and the film pressing roller 57 can be moved away from the stage 2.

<Winding device>
As shown in FIGS. 2 and 3, the winding device 71 is a film winding roller 73 rotatably supported by a bearing member 79 erected on the base plate 21, and is parallel to the long axis of the film pressing roller 57. A film take-up roller 73 having a long axis, a drive motor 72 that drives the film take-up roller 73 and is provided on the gantry 52, and a film take-up roller that receives the rotational force of the drive motor 72. And a drive belt 74 for transmission to 73.
The drive belt 74 is stretched around a pair of pulleys 75 and 76 provided at positions facing the opening 61 formed in the gantry 52, and these pulleys 75 and 76 are respectively connected to the drive motor 72. It is fixed around the drive shaft 78 and around the shaft 77 of the film take-up roller 73.

In this configuration, when the drive motor 72 is rotated forward and the pulley 75 is rotated in a predetermined direction (counterclockwise direction when viewed from the upstream right side, hereinafter simply referred to as “counterclockwise direction”), the drive belt 74 The pulley 76 also rotates in a predetermined direction, and the film winding roller 73 rotates in the winding direction (counterclockwise direction). At this time, when the film take-up roller 73 is rotated in the take-up direction with the peeling end of the polarizing plate 7 connected to the roller drum by a tape, the polarizing plate 7 peeled off from the glass substrate 6 is filmed. It can be wound up by a winding roller 73.
The film take-up roller 73 may have, for example, a configuration having two divided roller drum halves. When the roller drum halves are assembled together to form one film winding roller, the polarizing plate 7 is connected to the film winding roller by gripping the end of the polarizing plate 7 peeled between them. Can be made. Further, a hook portion made of a protrusion may be formed on the outer peripheral surface of the film take-up roller 73. In this case, the end of the polarizing plate 7 can be connected to the film take-up roller by making a hole in the end of the peeled polarizing plate 7 with a punch and hooking the hole on the protrusion.

<Movement mechanism>
As shown in FIGS. 2 and 3, the moving mechanism 91 is located on the most upstream side with respect to the base plate 21 and is fixed to the corner on the right side of the upstream side. The drive motor 92 and the drive shaft 93 of the drive motor 92 are connected to each other. And a pinion 94 fixed to the end. The drive motor 92 is disposed so that the teeth of the pinion 94 mesh with the rack 13 formed on the stage 2. With this configuration, when the drive motor 92 is rotated forward and the pinion 94 is rotated in a predetermined direction (counterclockwise direction), the teeth of the pinion 94 and the rack 13 are engaged, and the peeling device 4 is Can move in the peeling direction (FIG. 3, left direction). On the other hand, when the drive motor 92 is rotated in the reverse direction and the pinion 94 is rotated in the direction opposite to the predetermined direction (clockwise direction when viewed from the upstream right side, hereinafter simply referred to as “clockwise direction”), the peeling device 4 is The whole can move in the non-peeling direction (right direction in FIG. 3).

<Peeling method>
Next, an embodiment of the peeling method of the present invention in which the polarizing plate 7 of the liquid crystal display panel 5 is peeled from the glass substrate 6 using the film peeling apparatus 1 of the present invention will be described. In this embodiment, the liquid crystal display panel 5 of the type in which the polarizing plate 7 is attached to one side of the glass substrate 6 is used. Of course, the liquid crystal display panel of the type in which the polarizing plate is attached to both sides is used. A peeling method can be applied.
FIG. 4 is a vertical sectional view of the liquid crystal display panel 5 schematically showing a state where the end of the polarizing plate 7 is peeled off from the glass substrate 6.
FIG. 5A schematically shows a state before the peeling process in which the end portion of the polarizing plate 7 shown in FIG. 4 is connected to the film winding roller 73 and the film pressing roller 57 / substrate pressing blade 32 is arranged at a predetermined position. FIG. 3 is a vertical sectional view of the peeling device 4,
FIG. 5B is a partially enlarged view of the alternate long and short dash line portion of FIG. 5A, showing the gap T2 between the peeled polarizing plate surface and the substrate pressing blade 32.
6A is a vertical sectional view of the peeling device 4 schematically showing a state in which the peeling device 4 is moved in the peeling direction, and FIG. 6B shows a substrate pressing blade / tip 32a and a drooping FIG. 7 is a partially enlarged view of a one-dot chain line portion of FIG. 6A, showing a distance T <b> 1 with a point 57 a and a gap T <b> 2 between the back surface of the glass substrate 6 and the stage.

The following steps were performed.
<1. Preparation stage>
<1.1 Placement of protective sheet>
A plastic protective sheet is placed on the stage 2 to protect the liquid crystal display panel 5.
<1.2 Adjustment and fixing of substrate holding blade 32>
Based on the thickness data measured for the thickness of the liquid crystal display panel 5 / polarizing plate 7, the vertical direction / height and horizontal direction / position of the substrate pressing blade 32 are adjusted by the height adjusting mechanism 34 and the angle adjusting mechanism 33, respectively. And fix.
At this time, the liquid crystal display panel 5 is not placed on the stage 2. Accordingly, the vertical direction and height of the substrate pressing blade 32 are such that a gap T2 is formed between the tip 32a and the partially peeled liquid crystal display panel 5 (hard substrate surface portion) on which the tip 32a is placed (FIG. 5). 5 (b), and the height adjustment mechanism 34 adjusts. The vertical direction / distance between the substrate pressing blade / tip 32a thus adjusted and fixed and the upper surface 2a of the stage 2 is [(thickness of the liquid crystal display panel 5−thickness of the polarizing plate 7) + gap T2]. Equivalent to. The gap T2 can be changed according to the thickness of the polarizing plate 7. That is, the gap T2 in this embodiment is 0.04 mm, which corresponds to (thickness of polarizing plate 7 as a film 0.5 mm) × 0.08 times, (thickness of polarizing plate 7) × 0.008 to 0.80 times, In particular, it may be within a range of 0.001 to 0.40 times, particularly preferably 0.01 to 0.20 times. Since the thickness of the adhesive layer 8 is as small as 1 to 3 × 10 ⁻² mm, it was ignored when calculating the gap T2.
In addition, regarding the vertical direction and the height, the substrate pressing blade 32 that presses the peeled portion is closer to the upper surface 2a of the stage 2 by the thickness of the polarizing plate 7 than the film pressing roller 57 that presses the unpeeled portion.

The horizontal direction and position of the substrate pressing blade 32 can be determined by the following and adjusted by the angle adjusting mechanism 33.
6B, a perpendicular line is dropped on the stage 2 from the intersection of the horizontal line passing through the center of the film pressing roller 57 and the circumference, and the intersection of the perpendicular line and the peeled liquid crystal display panel surface is defined as a drooping point 57a. Then, the distance between the drooping point 57a and the pressing blade / tip 32a can be determined as the horizontal distance T1.
According to the experiments by the present inventors, the smaller the T1 is, including the case where it is negative, the more the adhesive tends to remain on the liquid crystal display panel substrate side. In the meantime, it was found that the liquid crystal display panel 5 tends to turn up.
When T1 is small, that is, as the pressing position of the substrate pressing blade 32 approaches the downstream film pressing roller 57, the expandable adhesive layer between the film pressing roller 57 and the stage 2 is broken during the peeling process. Therefore, it is considered that the adhesive layer remains on the liquid crystal display panel substrate. On the other hand, when T2 is large, that is, when the pressing position of the substrate pressing blade 32 moves away from the film pressing roller 57 and moves upstream, It is considered that the force generated at the time of peeling becomes larger than the force pressed by the substrate pressing blade 32, and as a result, the liquid crystal display panel 5 is turned up.
According to the experimental results at the present time, T1 is a positive value, that is, the substrate pressing blade / tip 32a is present on the upstream side of the film pressing roller 57 (the drooping point 57a), and the best numerical value at the present time is , About 2 mm. In order to obtain such a horizontal direction and position, as described above, it can be adjusted and fixed by the angle adjusting mechanism 33, and the inclination angle of the substrate pressing blade 32 is about 45 degrees.
Thus, with respect to the peeling direction, the tip 32a of the substrate pressing blade 32 is disposed at a position away from the film pressing roller 57 to the upstream side, thereby preventing the liquid crystal display panel 5 from being turned over while eliminating the adhesive residue. I was able to.

<1.3 Setting of the height of the film pressing roller 57>
Based on the thickness data, the height of the film pressing roller 57 is set by the air cylinders 55 and 56. According to this setting, the film pressing roller 57 can be lowered in the following item 2.3.

<1.4 Connecting step 1>
The corner corresponding to the end of the liquid crystal display panel 5 and the polarizing plate 7 is peeled off from the glass substrate 6 together with the adhesive layer 8 by a cutter (see FIG. 4), and one end of the tape is attached to the peeled polarizing plate 7. To do.

<2. Peeling work>
<2.1 Set of LCD panel 5>
After the film pressing roller 57 is raised, the liquid crystal display panel 5 from which the corners of the polarizing plate 7 are peeled is placed on the upper surface 2 a of the stage 2. Since the substrate pressing blade 32 is fixed at a predetermined height at the time of this placement, the liquid crystal display panel 5 is inserted so as not to contact the substrate pressing blade 32. Further, as shown in FIG. 2, the liquid crystal display panel 5 is arranged so that the long side and the short side are inclined at about 45 ° with respect to the peeling direction, and the corners of the peeled polarizing plate 7 are peeled off. It arrange | positions so that it may become the apparatus 4 nearest.
<2.2 Linking step 2>
The other end of the tape (see item 1.4) attached to the peeled polarizing plate 7 is attached to the roller drum of the film take-up roller 73 via the film pressing roller 57, and the polarizing plate 7 and the film The winding roller 73 is connected (see FIG. 5A). Accordingly, the polarizing plate 7 peels off from the glass substrate 6 and rises, comes into contact with the film pressing roller 57 and the roller drum, rises along the outer periphery of the roller drum, and then rises upward in the peeling direction. The take-up roller 73 reaches the roller drum and is stuck to the roller drum via a tape.
Therefore, the end of the peeled film is connected to the film take-up roller 73 via the film pressing roller 57, thereby ensuring a smooth take-up.

<2.3 Fixing the height of the film pressing roller 57>
The film pressing roller 57 is lowered, and the film pressing roller 57 is fixed so that a gap is not substantially formed between the film pressing roller 57 and the liquid crystal display panel 5 (see FIG. 5A). As described above, in the case of the substrate pressing blade 32, the predetermined gap T2 is formed, whereas in the case of the film pressing roller 57, it is possible to prevent damage to the panel without substantially forming a gap. found. This is probably because the former holds a hard substrate while the latter holds a soft polarizing film.
At this time, the substrate pressing blade 32, the film pressing roller 57, and then the film winding roller 73 are arranged in this order from the upstream side with respect to the peeling direction, and the film winding roller 73 is more vertical than the film pressing roller 57. It arrange | positions in direction and upper direction (refer Fig.5 (a)).

<2.4 Peeling process>
A start switch (not shown) is input to start a static elimination blower (not shown), and then the film winding roller 73 is rotated by rotating the drive motor 72 at a predetermined rotational speed / rotational force. The peeling device 4 provided with the film winding roller 73 / film pressing roller 57 / substrate pressing blade 32 is moved in the peeling direction by the moving mechanism 91 adjusted to a predetermined speed (see FIG. 6A). In this respect, the present invention can achieve downsizing of the apparatus as compared with the prior art in which the rotation / film winding roller is not moved.
In this peeling step, the liquid crystal display panel 5 is sandwiched between the stage 2 and the substrate pressing blade 32 and the film pressing roller 57 so as to be able to vibrate in a substantially vertical direction, while being vibrated in the horizontal direction. It is placed on the stage 2.
For example, before the start of the peeling process, the substrate pressing blades 32 are each arranged with a gap T2 from the partially peeled liquid crystal display panel portion as described above (see FIG. 5B). After the peeling process is started, the partially peeled liquid crystal display panel portion can vibrate with the maximum amplitude T2 in the vertical direction (see FIG. 6B), and the horizontal vibration is also excessively limited. Absent. During the peeling process, the peeling process proceeds while the liquid crystal display panel 5 vibrates left and right in the horizontal direction and up and down in the vertical direction. In FIG. 6B, the gap T2 is shown to exist even vertically below the film pressing roller 57. Actually, however, the gap near the vertically lower part is smaller than the gap T2 including zero. Therefore, the vibration width of the panel directly below the pressing roller 57 is smaller than the gap T2.
The vertical vibration (partially peeled liquid crystal display panel part / liquid crystal display panel part vibration) is transmitted to the glass substrate 6 through the adhesive layer 8 when the polarizing plate 7 is peeled off. This is considered to be caused by intermittently pulling the liquid crystal display panel 5 vertically upward during the peeling process. When the liquid crystal display panel 5 is pulled vertically upward, the film pressing roller 57 / substrate pressing blade 32 respectively presses the liquid crystal display panel part / partially peeled liquid crystal display panel part through the polarizing plate 7 (FIG. 6). (See (b)). The liquid crystal display panel 5 is pressed by the film pressing roller 57 / substrate pressing blade 32 during most of the peeling process.
Thus, according to the method of the present invention, the polarizing plate 7 including the polarizing plate 7 could be peeled without damaging the liquid crystal display panel 5.

<3.0 Recovery / Disposal process>
After all the polarizing plates 7 have been removed, the film is automatically stopped, the film pressing roller 57 is raised, and the liquid crystal display panel 5 from which the polarizing plates 7 have been removed is removed from the stage 2 and reused, while the film take-up roller 73 is By rotating in the clockwise direction, the separated polarizing plate 7 is collected and discarded.

The perspective view which shows the film peeling apparatus which is embodiment of this invention. The top view of the film peeling apparatus shown in FIG. The partial side view of the film peeling apparatus shown in FIG. The vertical sectional view of the liquid crystal display panel which shows the state which peeled the edge part of the polarizing plate from the glass substrate typically. (A) is a peeling apparatus schematically showing the state before the peeling process in which the end of the polarizing plate shown in FIG. 4 is connected to the film take-up roller and the film pressing roller / substrate pressing blade is arranged at a predetermined position. FIG. 6B is a partially enlarged view of FIG. 5A, showing a gap between the peeled polarizing plate surface and the substrate pressing blade. (A) is a vertical sectional view of the peeling device schematically showing a state in which the peeling device is moved in the peeling direction, and (b) is a distance between the film pressing blade / tip and the droop point and glass. The partial enlarged view of Fig.6 (a) which shows the clearance gap between the back surface of a board | substrate and a stage.

Explanation of symbols

  1: Film peeling device 5: Liquid crystal display panel (electro-optical panel) 6: Glass substrate (hard substrate) 7: Polarizing plate (film) 32: Substrate pressing blade 57: Film pressing roller 73: Film winding roller

Claims (5)

A film peeling method for peeling the film about an electro-optical panel having a hard substrate and a film bonded to the surface of the hard substrate,
A connecting step of peeling an end of the film from the hard substrate and connecting the peeled end of the film to a film take-up roller;
The surface of the hard substrate from which the film has been peeled is pressed by a substrate pressing blade, and the film winding roller is wound in the winding direction for winding the film while the electro-optical panel is pressed by the film pressing roller via the film. The film winding roller, the substrate pressing blade and the film pressing roller are moved in the peeling direction while rotating, and the peeling step of peeling the film from the hard substrate,
During the peeling process, the electro-optical panel is held between the stage on which the electro-optical panel is placed and the substrate pressing blade and the film pressing roller so that the electro-optical panel can be vibrated in a substantially vertical direction and is substantially horizontal. A film peeling method, wherein the film is placed on the stage so as to vibrate in a direction.   Prior to either the connecting step or the peeling step, when the substrate pressing blade is installed at a predetermined position, between the substrate pressing blade and the hard substrate surface portion from which the film has been peeled, The film peeling method according to claim 1, wherein a gap is provided, and the gap corresponds to a maximum width of the vibration in a vertical direction during the peeling process.   The film peeling method according to claim 1, wherein during the connecting step, the end of the film peeled off is connected to the film winding roller via the film pressing roller.   The substrate pressing blade is disposed so that the hard substrate surface portion with which the substrate pressing blade can come into contact with the substrate pressing blade during the peeling step is positioned upstream of the film pressing roller in the peeling direction. The film peeling method according to claim 1, wherein: The film peeling apparatus for carrying out the film peeling method according to claim 1, wherein the film is peeled off for an electro-optical panel having a hard substrate and a film bonded to the surface of the hard substrate.
A film take-up roller for connecting ends of the film peeled from the hard substrate;
A substrate pressing blade for pressing the hard substrate surface portion from which the film has been peeled;
A film pressing roller for pressing the electro-optical panel through the film;
When the film winding roller is rotated in the winding direction for winding the film, the film winding roller, the substrate pressing blade, and the film pressing roller are moved in a peeling direction for peeling the film from the hard substrate. A film peeling apparatus comprising: a moving mechanism.

Images