JP2007264308A - Method of laminating plate member - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To surely harden a temporarily fixing material before an adhesive reaches an arrangement position of the temporarily fixing material when utilizing the temporarily fixing material to laminate two plate members by the adhesive. <P>SOLUTION: Temporarily fixing materials 5 are arranged in end parts of a plate member 1 being a lower layer. The plate member 1 and a plate member 2 being an upper layer are stuck by an adhesive 3. An UV curable resin is used as the temporarily fixing material 5. A thermosetting adhesive is used as the adhesive. Pillar materials (spacers) 6 are added to the temporarily fixing material 5 in advance. Spacers 4 are added to the adhesive 3 in advance. A diameter of the pillar material 6 is larger than that of the spacer material 4. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a laminating method for laminating two plate bodies by bonding.

  Display panels such as liquid crystal display panels and organic EL display panels have plate-like bodies such as glass substrates and polarizing plates. And it has the structure where two plate-shaped bodies were laminated | stacked. In addition, a liquid crystal display device may be formed by stacking two or more liquid crystal display panels. Further, a touch sensor panel, a planar heater, a protective substrate, and the like may be stacked on the display panel.

  As a laminating method for laminating two plate bodies in a display panel, there is a dispenser method. In the laminating method by the dispenser method, the adhesive discharged from the dispenser is applied to one plate-like body, and the other plate-like body is placed on the upper part of the portion where the adhesive is applied, and then the plate-like shape is applied. The adhesive is spread with the body, and then the adhesive is cured (see, for example, Patent Document 1).

  However, when the laminating method described in Patent Document 1 is used, the distance between the two plate-like bodies is not uniform, and there is a possibility that displacement occurs. Therefore, in order to prevent positional displacement while making the distance between the two plate-like bodies uniform, temporary fixing may be performed with a temporary fixing material. For example, an adhesive is applied to the central portion of one plate-like body, and a temporary fixing material is applied to a plurality of locations in the end portion (near the edge of the plate-like body in the plane of the plate-like body). Then, the other plate-like body is placed on the adhesive, and the other plate-like body is pressed in the direction in which the one plate-like body exists. Then, the adhesive extends from the central portion toward the end, and the adhesive spreads over almost the entire area between the two plate-like bodies. When the adhesive is cured in this state, the two plates are fixed by the adhesive.

  As the temporary fixing material, an ultraviolet (UV) curable resin having a high curing speed is used. When the plate-like body is a display panel itself such as a liquid crystal display panel or an organic EL display panel or a component in the display panel, a thermosetting adhesive (thermosetting transparent resin) is used as the adhesive. This is because if a UV curable resin is used as the adhesive, the liquid crystal display panel or the organic EL display panel may be deteriorated by the ultraviolet irradiation.

  The reason why the UV curable resin having a high curing speed is used as the temporary fixing material is that it is desired to cure the temporary fixing material at the end as fast as possible. If the time to complete the temporary fixing material is long, the adhesive may reach the end before the temporary fixing material is cured. Then, the adhesive may be mixed with the temporary fixing material and cannot be fixed with the temporary fixing material. The reason is that the adhesive hinders the UV curing reaction of the temporary fixing material, or the adhesive enters the interface between the temporary fixing material and the plate-like body, and the temporary fixing material and the plate-like body are not bonded. it is conceivable that.

  Moreover, the height of the temporary fix | stop material of several places may not align according to the difference in how the adhesive agent is extended. As shown in FIG. 6, when the height varies, the distance between one plate-like body and the other plate-like body is not uniform. That is, the height of the other plate-like body based on the surface of one plate-like body is not uniform. In the portion P having a higher height, the adhesive does not extend sufficiently, resulting in poor adhesion. Further, in the portion P, the adhesive is insufficient and air bubbles are easily included in the adhesive. When bubbles are included in the adhesive, there is a possibility that a portion having a different refractive index is generated in the adhesive layer, and the visibility and cosmetics of the display are lowered. In addition, in the portion Q having a lower height, the adhesive may extend too much and the adhesive may leak from between the temporarily fixed portions, or conversely, the adhesive may get stuck and poor adhesion may occur. Furthermore, since the adhesive is not uniformly applied to the bonding surface, air bubbles are included, which may reduce the visibility of the display.

  Therefore, in order to make the heights of the temporary fixing materials at a plurality of locations uniform and to make the distance between one plate-like body and the other plate-like body uniform over the entire surface, column materials (spacers) are provided on the temporary fixing materials. A method of adding has been proposed (see, for example, Patent Document 2).

JP 2000-75306 A (paragraph 0081, FIG. 15) JP 2004-4355 A (paragraph 0013, FIG. 1)

  If the method described in Patent Document 2 is used, the height of the temporary fixing material can be made uniform, and the distance between the two plate-like bodies can be made uniform, and the adhesive surface is uniformly filled with the adhesive. be able to. As a result, the occurrence of adhesion failure and display failure is prevented.

  However, even when the method described in Patent Document 2 is used, the adhesive may reach the end before the temporary fixing material is cured. If the adhesive reaches the end before the temporary fixing material is cured, as described above, the adhesive is mixed with the temporary fixing material and cannot be fixed with the temporary fixing material.

  Therefore, in the present invention, when two plate-like bodies are laminated with an adhesive using a temporary fixing material, the adhesive is temporarily fixed while the heights of the temporary fixing materials disposed at a plurality of locations are made uniform. It aims at providing the lamination | stacking method of the plate-shaped body which can harden a temporary fix | stop material reliably before reaching the arrangement | positioning location of a stop | fastening material.

  The method for laminating a plate-like body according to the present invention is a method for laminating two plate-like bodies using an adhesive, and an adhesive containing a granular spacer material is applied to one plate-like body. Apply to the surface of the body, and to the end of the surface of the plate-like body, apply a UV curable temporary fixing material containing a granular spacer whose diameter is larger than the diameter of the spacer material, the other plate-like The body is brought into contact with the adhesive, a force in a direction toward the one plate is applied to the plate-like body, the temporary fixing material is cured with ultraviolet rays, and then the adhesive is cured.

  It is preferable to use an elastic temporary fixing material as the ultraviolet curable temporary fixing material.

  As the spacer contained in the temporary fixing material, it is more preferable to use a spacer having elasticity.

  According to the present invention, the temporary fixing material can be reliably cured before the adhesive reaches the temporary fixing material, while the height of the temporary fixing material provided at a plurality of locations is made uniform. It is possible to prevent a situation in which the fixing with the temporary fixing material cannot be performed.

(Embodiment 1)
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a flowchart showing a method for laminating plate-like bodies according to the present invention. FIG. 2 is a cross-sectional view showing a part of a state where one plate-like body (lower plate-like body) and the other plate-like body (upper-layer plate-like body) are stacked. 3 and 4 are explanatory diagrams for explaining a method of laminating plate-like bodies, respectively.

  As shown in FIG. 2, a temporary fixing material 5 is disposed at an end portion of the lower plate-like body 1. The lower plate member 1 and the upper plate member 2 are fixed with an adhesive 3. In the present embodiment, a UV curable resin is used as the temporary fixing material 5. Moreover, a thermosetting adhesive (specifically, a thermosetting transparent resin) is used as the adhesive 3.

  A columnar material (spacer) 6 is added to the temporary fixing material 5 in advance. That is, the temporary fixing material 5 containing the column material 6 is applied to the end portion of the lower plate-like body 1. Further, the temporary fixing material 5 is disposed at two opposing sides so that the upper plate-like body 2 is uniformly held by the temporary fixing material 5, and one is a side other than the opposing side. It is assumed to be a three-point support that is arranged so as to be positioned at the center. Preferably, the plate-like body 1 is arranged so as to be uniformly dispersed on the outer periphery. Furthermore, it may be arranged in a dot shape along the outer periphery of the plate-like body 1 or may be arranged in a strip shape along the outer periphery of the plate-like body 1.

  The pillar material 6 is granular, and the shape of the pillar material 6 is substantially spherical (including a true spherical shape). In addition, a spacer material 4 is added to the adhesive 3 in advance. That is, the adhesive 3 containing the spacer material 4 is applied to the central portion of the surface of the lower plate 1. The spacer material 4 is granular, and the shape of the spacer material 4 is substantially spherical (including a true spherical shape).

  What is characteristic in the present embodiment is that the diameter of the pillar material 6 is larger than the diameter of the spacer material 4. For example, the diameter of the pillar material 6 is selected to be about 10 to 50% larger than the diameter of the spacer material 4. Since the diameter of the column 6 is larger than the diameter of the spacer 4, when the upper plate 2 is pressed against the adhesive 3 applied to the lower plate 1, the lower plate 1 and The distance from the upper plate-like body 2 is substantially regulated by the diameter of the column member 6.

  Next, with reference to the flowchart of FIG. 1, each process of the lamination | stacking method of a plate-shaped object is demonstrated. Here, one of the lower plate member 1 and the upper plate member 2 is a liquid crystal display panel or an organic EL display panel (hereinafter referred to as a display panel), and the other is a plate other than the display panel. However, the scope of application of the present invention is not limited to the case where the combination of two plate-like bodies is a display panel and the other. In addition, when one of the lower plate member 1 and the upper plate member 2 is a display panel, the portion where the temporary fixing material 5 is disposed is preferably outside the display region. .

  As shown in FIG. 1, first, the application amount of the adhesive 3 is determined (step S1). For example, the application amount of the adhesive 3 is calculated on the assumption that the adhesive 3 corresponding to the height corresponding to the diameter of the column 6 is applied to the entire lower plate-like body 1.

  And the adhesive agent 3 is made to the center part of the lower layer plate-shaped body 1 by discharging the thermosetting transparent resin as the adhesive agent 3 of the calculated application quantity from the dispenser to the center part of the lower layer plate-shaped body 1. Is applied (step S2). The adhesive 3 contains a spacer material 4 in advance.

  Further, the temporary fixing material 5 is disposed on the lower plate-like body 1 by discharging the UV curable resin as the temporary fixing material 5 from the dispenser to a plurality of locations at the end of the lower plate-like body 1 (step). S3). When the planar shape of the lower plate-like body 1 and the upper plate-like body 2 is rectangular, for example, temporary fixing materials 5 are arranged at four corners. The temporary fixing material 5 contains a column material 6 in advance. For example, the temporary fixing material 5 containing the column material 6 is obtained by mixing the UV curable resin and the column material 6 (for example, spherical glass or spherical transparent plastic) into the stirring device and stirring them with the stirring device. Is obtained.

  When the process of step S3 is performed, as illustrated in FIG. 3A and FIG. 4A, the adhesive 3 is applied to the central portion of the surface of the lower plate-like body 1, and the lower plate-like body. The temporary fixing material 5 is disposed at a plurality of locations (four corners in the example shown in FIG. 4A) at the end of the surface of 1. Note that the execution order of the process of step S2 and the process of step S3 may be reversed.

  Next, the upper plate-like body 2 is overlaid on the adhesive 3 (step S4). Then, the upper plate 2 is pushed down with the lower plate 1 fixed (step S5). When the upper plate-like body 2 is pushed down, at least the position where the temporary fixing material 5 is disposed is pushed down uniformly. Preferably, the entire plate-like body 2 is pressed down uniformly. The upper plate-like body 2 is positioned such that the distance between the lower-layer plate-like body 1 and the upper-layer plate-like body 2 is a value corresponding to the diameter of the columnar material 6 contained in the temporary fixing material 5. Stop. Then, as illustrated in FIG. 3B, the temporary fixing material 5 is cured by irradiating the temporary fixing material 5 with ultraviolet rays from the UV irradiation device 10 (step S6). During the processing of steps S5 and S6, the adhesive 3 applied to the central portion of the lower plate-like body 1 extends toward the end of the lower plate-like body 1.

  In the present embodiment, when the temporary fixing material 5 is cured, the interval between the lower plate member 1 and the upper plate member 2 is temporarily fixed at each end (for example, four corners). It is regulated by the diameter of the column material 6 contained in each of the materials 5. Therefore, when pressure is applied to the upper plate-like body 2, that is, when a force in the direction toward the lower plate-like body 1 is applied to the upper plate-like body 2, the interval is pillared at each end. It does not become smaller than the diameter of the material 6, and the height of the upper plate 2 can be made uniform with reference to the surface of the lower plate 1. As a result, the occurrence of poor adhesion or the like is prevented.

  Further, in the present embodiment, the diameter of the column material 6 is larger than the diameter of the spacer material 4. Consider a case where the diameter of the pillar material 6 is the same as the diameter of the spacer material 4 or the diameter of the spacer material 4 is larger than the diameter of the pillar material 6. This case will be referred to as a reference example. In the reference example, when the upper plate member 2 is pressurized, the distance between the lower plate member 1 and the upper plate member 2 is regulated by the diameter of the spacer material 4. That is, the upper plate-like body 2 is pushed down to a height corresponding to the diameter of the spacer material 4.

  On the other hand, in the present embodiment, the upper plate-like body 2 stops at a position higher than the height corresponding to the diameter of the spacer material 4. The fact that the upper plate-like body 2 is pushed down to a height corresponding to the diameter of the spacer material 4 as in the reference example is based on the height of the temporary fixing material 5 regulated by the diameter of the column material 6. Then, the upper layer plate-like body 2 is pushed down more in the reference example than in the case of the present embodiment. Then, in the reference example, the adhesive 3 applied to the central portion of the lower plate-like body 1 reaches the position where the temporary fixing material 5 is disposed more quickly. In other words, the present embodiment has a larger time margin until the adhesive 3 reaches the position where the temporary fixing material 5 is disposed. That is, the possibility that the adhesive 3 does not reach the position where the temporary fixing material 5 is disposed before the temporary fixing material 5 made of the UV curable resin is cured is reduced.

  In the present embodiment, when the temporary fixing material 5 is cured, the adhesive 3 reaches near the end of the lower plate-like body 1 as illustrated in FIG. It does not reach the place where the stopper 5 is disposed. Thereafter, the adhesive 3 further extends outward by capillary action.

  After the temporary fixing material 5 is cured, the adhesive 3 is sandwiched between the lower plate member 1 and the upper plate member 2, and the lower plate member 1 and the upper layer are attached with the temporary fixing member 5. The laminate in a state where the plate-like body 2 is temporarily fixed is placed in a heating tank and heated (step S7). When heating for a predetermined time until the adhesive 3 is cured is completed, a laminate in which the lower plate 1 and the upper plate 2 are fixed by the adhesive layer is obtained.

  As described above, in the present embodiment, since the columnar material 6 is contained in the temporary fixing material 5, the height of the temporary fixing material at a plurality of locations can be made uniform. Further, based on the fact that the diameter of the column material 6 is larger than the diameter of the spacer material 4, the temporary fixing material 5 can be surely cured before the adhesive 3 reaches the place where the temporary fixing material 5 is disposed. .

(Embodiment 2)
When the processing of steps S1 to S7 shown in FIG. 1 is completed, the lower plate-like body 1 and the upper plate-like body 2 are fixed to each other with the temporary fixing material 5 at the end, and the portions other than the end are bonded. It is firmly fixed by the agent 3. The spacer material 4 contained in the adhesive 3 regulates the distance between the lower plate member 1 and the upper plate member 2 so as not to be smaller than the diameter of the spacer member 4. However, as described above, the diameter of the spacer material 4 contained in the adhesive 3 is smaller than the diameter of the column material 6 that regulates the height of the temporary fixing material 5.

  Then, when the adhesive 3 is cured, in the central portion of the laminate, where the influence of the height regulation by the column member 6 becomes small, as illustrated in FIG. 5, the lower plate-like body 1 and the upper plate-like body The space between the body 2 may be smaller than the value corresponding to the diameter of the column member 6. That is, the laminate may bend.

  The degree of bending is preferably small. In order to reduce the degree of bending, the height of the temporary fixing material 5 is reduced following the decrease in the distance between the lower plate member 1 and the upper plate member 2 at the center. do it. In order to do so, it is preferable that the material of the temporary fixing material 5 has elasticity like rubber. Examples thereof include ultraviolet curable silicone rubber and acrylonitrile-butadiene copolymer.

  In the above embodiment, spherical glass or spherical transparent plastic is used as the column member 6. However, when a material having elasticity is used as the temporary fixing material 5, and a material having elasticity is further used as the column material 6 contained in the temporary fixing material 5, the lower plate-like body 1 and the upper layer plate are used. This is more preferable because the performance of reducing the height of the temporary fixing material 5 can be improved by following the decrease in the distance between the first and second bodies 2. In particular, the column member 6 is preferably a plastic elastic body such as a styrene-butadiene copolymer.

  Using the adhesive 3 containing the spacer material 4 having a diameter of 60 μm and the temporary fixing material 5 containing the column material 6 having a diameter of 80 μm, the laminating method of the first embodiment (embodiment 1) is carried out. did. That is, the processes of steps S1 to S7 were executed.

  In step S5, a force in a direction toward the lower plate-like body 1 is applied to the upper plate-like body 2 until the distance between the lower plate-like body 1 and the upper plate-like body 2 is 80 μm. It was. At the time when the temporary fixing material 5 is cured, as illustrated in FIG. 4B, the adhesive 3 does not reach the position where the temporary fixing material 5 is disposed.

  The present invention is used for laminating two plate-like bodies, such as when laminating a display panel such as a liquid crystal display panel or an organic EL display panel and a plate-like body such as a touch sensor panel, a planar heater, or a protective substrate. It is preferably applied.

The flowchart which shows the lamination | stacking method of the plate-shaped object by this invention. Sectional drawing which shows a part of state in which the lower plate-shaped body and the upper plate-shaped body were laminated | stacked. Explanatory drawing for demonstrating the lamination | stacking method of a plate-shaped object. Explanatory drawing for demonstrating the lamination | stacking method of a plate-shaped object. Explanatory drawing which shows the bending of a laminated body. Explanatory drawing for demonstrating the lamination | stacking method of the conventional plate-shaped object.

Explanation of symbols

1 Lower plate (one plate)
2 Upper plate (the other plate)
3 Adhesive 4 Spacer Material 5 Temporary Fixing Material 6 Column Material (Spacer)
10 UV irradiation equipment

Claims (3)

In the laminating method of a plate-like body in which two plate-like bodies are laminated using an adhesive,
An adhesive containing a granular spacer material is applied to the surface of one plate-like body, and a granular spacer whose diameter is larger than the diameter of the spacer material is contained at the end of the surface of the plate-like body. Apply the UV curable temporary fixing material,
The other plate-shaped body is brought into contact with the adhesive, and a force in a direction toward the one plate-shaped body is applied to the plate-shaped body,
The method for laminating plate-like bodies, wherein the adhesive is cured after the temporary fixing material is cured with ultraviolet rays. The method for laminating plate-like bodies according to claim 1, wherein an elastic temporary fixing material is used as the ultraviolet curable temporary fixing material. The method for laminating plate-like bodies according to claim 2, wherein an elastic spacer is used as the spacer contained in the temporary fixing material.

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