JP3465209B2 - Peeling method of thin sheet protection sheet - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for removing a protective sheet attached to the surface of a thin plate such as a polarizing plate.

[0002]

2. Description of the Related Art Polarizing plates are thin film-like plates that are attached to both sides of a color liquid crystal panel of a liquid crystal display, and protect the front and back surfaces of a rectangular polarizing plate body 11 as shown in FIG. In order to do so, the protective sheets 12 and 13 having the same shape are usually attached. When the polarizing plate 1 is set in the polarizing plate sticking device and actually stuck to the liquid crystal panel, the protective sheet 1 is attached before the sticking process.
2, 13 must be peeled off.

Conventionally, from the polarizing plate 1 to the protective sheets 12 and 13
When peeling off, as shown in FIG. 4, a protective sheet on one surface of the polarizing plate 1, for example, the surface protective sheet 13 is adsorbed and fixed to a predetermined portion on the adsorption plate 2 included in the polarizing plate attaching device, and this fixation A plurality of adhesive tapes 3 are adhered in the side direction of the back surface protective sheet 12 on the polarizing plate 1 thus formed, and the back surface of each adhesive tape 3 is pressed by the rotation surface of the stick-shaped peeling roller 4 so that the end of each adhesive tape 3 The portion is pulled up from an initial pulling up portion, that is, one side end portion of the back surface protective sheet 12 (polarizing plate 1). Then, by applying tension to each adhesive tape 3 and pulling the adhesive tape 3 in the direction of one end of the opposite side while contacting the rotating surface of the peeling roller 4, the back surface protective sheet 12
Has been peeled off. Incidentally, the mounting of each adhesive tape 3, the transport mechanism, the tension applying mechanism, and the roller control mechanism for controlling the rotation and displacement of the peeling roller 4 are publicly known and therefore not shown.

[0004]

As described above, conventionally, the adhesive tape 3 is adhered in the side direction of the protective sheets 12 and 13, and the rotation surface of the peeling roller 4 presses the back surface of the adhesive portion, and The tape 3 is pulled up from one end of the protective sheets 12 and 13 as a starting point. Therefore, the pressing force of the peeling roller 4 is dispersed in one side direction, and the dispersed pressing force is non-uniform, so that the protective sheets 12 and 13 may not be peeled correctly. Further, as the protective sheets 12, 13 become larger, the adhesive tape 3
Since it is necessary to increase the number of tapes or increase the width of the tape, this leads to an increase in cost.
There is also a problem that it becomes extremely difficult to uniformly press and adhere to the surfaces of Nos. 2 and 13.

The object of the present invention is to solve the above problems,
When a protective sheet of the same shape attached to a thin plate having at least one vertex such as the polarizing plate 1 is peeled off using a long adhesive tape to which tension is applied, a smaller pressing force is applied. It is to provide a method capable of reliably peeling the protective sheet.

[0006]

According to the method provided by the present invention, a long sticky adhesive is applied to a surface of a protective sheet having the same shape attached to a thin plate having at least one apex. A method used in an apparatus for peeling the protective sheet from the thin plate by pulling up the tape while pressing and adhering the tape, wherein an initial pulling-up portion of the adhesive tape that is press-adhering is one apex of the protective sheet, Further, the end portion of the adhesive tape is pulled up in the diagonal direction of the protective sheet from the initial pulling up portion.

More specifically, the end portion of the adhesive tape is adhered to the initial pulling portion, the back surface of the adhesive portion of the adhesive tape is pressed by the rotating surface of the stick-shaped peeling roller, and the rotating shaft of the peeling roller is Is displaced in a diagonal direction of the initial pulling portion.

In this method, since the force applied to the protective sheet at the start of peeling approaches a point without limit, the problem of uneven pressing force is solved, and the force required for peeling is significantly smaller than in the case of one side. Therefore, the protective sheet is reliably peeled off. Moreover, since the adhesive tape is pulled up in a diagonal direction from one vertex of the protective sheet, the protective sheet can be peeled off with only one adhesive tape regardless of the shape of the protective sheet.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Next, an embodiment of the method of the present invention will be described with reference to the drawings. 1 and 2 are conceptual explanatory views in the case where a protective sheet attached to a rectangular polarizing plate is peeled off using an adhesive tape and a peeling roller. FIG. 1 shows an initial state and FIG. 2 shows a peeling process. It is shown. In the figure,
Elements having the same functions as those of the conventional method shown in FIG. Further, as the tape mounting, the transport mechanism, the tension applying mechanism, and the roller control mechanism in the polarizing plate sticking device, known ones can be used as they are, and therefore they are not shown.

Referring to FIG. 1, in this embodiment, first, a protective sheet on one surface of the polarizing plate 1, for example, a surface protective sheet 13 is adsorbed and fixed to a predetermined portion on the adsorption plate 2. After that, one adhesive tape 3 is adhered to one vertex of the fixed back surface protective sheet 12 on the polarizing plate 1, and the back surface of the adhesive tape 3 is pressed by the rotating surface of the rod-shaped peeling roller 4.

Next, a constant tension is applied to the adhesive tape 3,
The tape end is pulled up while maintaining the state in which the back surface is pressed by the rotation surface of the peeling roller 4. And peeling roller 4
The rotational axis of is displaced (retreated) in the diagonal direction of the back surface protection sheet 12. As a result, the back surface protection sheet 12 is
As shown in FIG. 3, the film is gradually peeled from the polarizing plate main body 11 from one apex portion in the diagonal apex direction. When the surface protection sheet 13 is peeled off, the polarizing plate 1 is turned over and the same procedure is repeated.

In this way, the force applied to the protective sheets 12 and 13 at the time of initial pulling up of the adhesive tape 3 approaches a point without limit, so that the apex portions of the protective sheets 12 and 13 are easily separated from the polarizing plate body 11. It After that, the protective sheets 12 and 13 from which the top portions are peeled off are easily peeled off by simply retracting the peeling roller 4.

Further, according to the present embodiment, even if the shape of the polarizing plate 1 becomes large, the protective sheets 12 and 13 can be peeled off with only one adhesive tape 3, so that the cost can be reduced and the consumption is reduced. The tape exchange time is also shortened.

In this embodiment, the rectangular polarizing plate 1 is used.
The case of peeling off the protective sheets 12 and 13 attached to the sheet has been described, but the present invention can be similarly applied to any thin sheet protective sheet having a shape having at least one apex.

[0015]

As is apparent from the above description, according to the present invention, when a protective sheet of the same shape attached to a thin plate is peeled off using a long adhesive tape to which tension is applied. The protective sheet can be reliably peeled off with less pressing force. Further, regardless of the shapes of the thin plate and the protective sheet, the protective sheet can be reliably peeled off from the thin plate with one adhesive tape, which is advantageous in terms of cost.

[Brief description of drawings]

FIG. 1 is an external perspective view showing an initial set state in an embodiment of a method for peeling a thin plate protection sheet according to the present invention.

FIG. 2 is an external perspective view showing a peeling process in the present embodiment.

FIG. 3 is an external perspective view showing the structure of a polarizing plate used in this embodiment.

FIG. 4 is an external perspective view showing a conventional protective sheet peeling method.

[Explanation of symbols]

1 Polarizer 11 Polarizer body 12,13 Protective sheet 2 adsorption plate 3 adhesive tape 4 peeling roller

Continuation of front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) B65H 41/00 B65B 69/00

Claims (3)

(57) [Claims] 1. A thin adhesive sheet having the same shape, which is attached to a thin sheet having at least one apex, is pulled up from the thin sheet while pressing and adhering a long adhesive tape to which tension is applied. A method for peeling a thin sheet protective sheet, which is used in an apparatus for peeling the protective sheet, characterized in that an initial pulling-up site of the pressure-sensitive adhesive tape is one vertex of the protective sheet. 2. The peeling method for a thin sheet protective sheet according to claim 1, wherein an end portion of the adhesive tape is pulled up from the initial pulling up portion in a diagonal direction of the protective sheet. 3. An end portion of the adhesive tape is adhered to the initial pull-up portion, the back surface of the sticky portion of the adhesive tape is pressed by the rotating surface of the stick-shaped peeling roller, and the rotation axis of the peeling roller is set to the initial stage. The method for peeling a thin plate protective sheet according to claim 2, wherein the pulling-up portion is displaced in a diagonal direction.