JP5430044B1 - Manufacturing method of protective plate for display device and manufacturing apparatus thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To protect a display device capable of maintaining high adhesiveness and adhesion between a curable resin layer and an adhesive layer when a step formed by a decorative layer on a protective plate is eliminated by a curable resin layer. Provide a board.
A process of transporting a base material 2 on which a decorative layer 3 is formed while applying tension that is pulled along the transport direction B, and transporting an adhesive 5 while applying tension that is pulled along the transport direction B. The step of supplying, the step of supplying the curable resin 4 to the surface of the substrate 2 on which the decorative layer 3 is formed, the step of bonding the curable resin 4 and the pressure-sensitive adhesive 5, and the pressure-sensitive adhesive 5. And a step of curing the subsequent curable resin 4. The base material 2 and the adhesive layer 5 are firmly bonded by the curable resin layer 4, and the decorative layer 3 and the adhesive layer 5 are firmly bonded by the curable resin layer 4.
[Selection] Figure 2

Description

  The present invention relates to a manufacturing method and a manufacturing apparatus for manufacturing a protective plate for a display device.

  The display device is a device that displays an image on a display surface, such as a mobile phone, a smart phone, a mobile terminal, a liquid crystal display device, a plasma display device, an organic EL (Electro Luminescence) device, or the like. A touch panel may be attached to the display surface of the display device. When this touch panel is attached to the display device, this touch panel is also a component of the display device. The display device protection plate according to the present invention is a protection plate for preventing the surface of the display device from being damaged.

  The display surface of a display device is often the surface of a glass plate or the surface of a plastic film. In general, a thin plate-like member is sometimes referred to as a “film”, and a thick plate-like member is sometimes referred to as a “sheet”. The concept includes a general “sheet”.

<First Conventional Example>
(Decrease in adhesion and adhesion)
Conventionally, the protection board for display apparatuses disclosed by patent document 1 is known. In patent document 1, the protection plate for display devices is called the protection plate for flat panel displays. According to FIG. 5 of Patent Document 1, as shown in FIG. 7 of the present application, photocuring is performed between a protective plate (corresponding to a substrate) 102 formed of a transparent film and a flat panel display unit 108 which is a display device. There is disclosed a protective plate 101 for a display device provided with a curable resin layer 104 made of a functional resin.

  The curable resin layer 104 functions to eliminate the level difference generated as a result of the presence of the decorative layer 103 and to flatten the surface of the protection plate 101 for display devices. For example, the curable resin layer 104 is cured by being irradiated with ultraviolet rays. Then, a double-sided tape (corresponding to an adhesive layer) 106 is bonded to the surface of the cured curable resin layer 104, and the display device protection plate 101 is bonded to the surface of the flat panel display unit 108 by the double-sided tape 106. .

  In the present specification, “adhesion” refers to “bonding and integrating the surfaces of the same kind or different kinds of solids”. An “adhesive” is a material that realizes the adhesion. “Adhesion” is an action included in the concept of adhesion. “Adhesion” means “adhesion using an adhesive”, and “adhesive” is “a fluid semi-solid when adhering adherends together and wets the adherend as it is” The material can be adhered to the adherend by applying a slight pressure at room temperature for a short time without causing any change in state.

  Examples of the adhesive include a solution-type adhesive, a photo-curable adhesive, a thermosetting adhesive, and a hot melt adhesive. The pressure-sensitive adhesive is sometimes referred to as a pressure-sensitive adhesive. Adhesives are difficult to handle on their own. Therefore, the pressure-sensitive adhesive is generally a pressure-sensitive adhesive product coated on various films. Such adhesive products are, for example, adhesive tapes and double-sided tapes. Examples of the adhesive include acrylic adhesives, silicone adhesives, urethane adhesives, and rubber adhesives.

  In the protective plate 101 for display device disclosed in Patent Document 1, since the double-sided tape 106 is adhered to the curable resin layer 104 after the curable resin layer 104 is cured, the curable resin layer 104 and the double-sided tape 106 are bonded to each other. Adhesion and adhesion with the tape 106 were poor.

  Next, a protection plate for a display device disclosed in Patent Document 2 is conventionally known. In Patent Document 2, the protection plate for display device is called an image display panel. According to Patent Document 2, a manufacturing method of a protective plate for a display device as schematically shown in FIG. 8 of the present application is disclosed. According to this manufacturing method, first, as shown in FIG. 8 (a), the step formed by the decorative layer 103 formed on the protective plate (corresponding to the base material) 102 is cured with an ultraviolet curable resin layer. Filled with a conductive resin layer 104. Then, as shown in FIG. 8B, a separator film 107 provided with a release agent 105 is laminated (laminated) on the curable resin layer 104, and further, as indicated by an arrow A, the separator film 107 is The resin 104 is cured by irradiating the curable resin layer 104 with ultraviolet rays R while applying pressure.

  The reason why the transparent adhesive resin 104 is irradiated with the ultraviolet ray R while pressurizing the separator film 107 is described to make the surface of the curable resin layer 104 flat. It is described that the step caused by the decorative layer can be eliminated without generating an air layer by curing the curable resin layer 104 in a flat state in this way. After the curable resin layer 104 is cured, the separator film 107 is peeled off, and then an optical double-sided tape (corresponding to an adhesive layer) 109 is adhered to the surface of the curable resin layer 104.

  Also in the protective plate for display device disclosed in Patent Document 2, since the double-sided tape 109 is bonded to the curable resin layer 104 after the curable resin layer 104 is cured, the curable resin layer 104 and the double-sided tape are used. Adhesion and adhesion with 109 were poor.

  By the way, in a general manufacturing method of a protective plate for a display device, as shown in FIG. 9, the protective plate 102 is formed in a large shape (that is, in a large area) and formed on the protective plate 102. In many cases, the decorative layer 103 includes a plurality of decorative patterns 103a corresponding to one protective plate for display device. Thus, when a plurality of decorative patterns 103a are formed on the large protective plate 102, the protective plates for individual display devices are manufactured by cutting the outer periphery of the individual decorative patterns 103a by cutting. Is done. As described above, when the outer periphery of each protective plate for display device is cut as described above, the adhesiveness and adhesion between the curable resin layer 104 and the double-sided tape 106 in FIG. 7 are poor, as shown in FIG. Thus, when the adhesiveness and adhesion between the curable resin layer 104 and the double-sided tape 109 are poor, when the large protective plate 102 in FIG. 9 is cut, the adhesive protrudes from the cut end face, or from the cut end face. Peeling may occur.

  Furthermore, in a general manufacturing method for display devices, after attaching a protective plate for display devices to the display device, if a defect such as misalignment or entrapment of foreign matter is found in the final inspection process, display is performed. There is a process of removing the protective plate from the display device in order to reuse the device. This process may be called a repair process. As described above, when the protective plate is peeled off from the display device in the repair process, the adhesiveness and adhesion between the curable resin layer 104 and the double-sided tape 106 are poor in FIG. 7, as shown in FIG. If the adhesiveness and adhesion between the curable resin layer 104 and the double-sided tape 109 are poor, the double-sided tapes 106 and 109 are transferred from the protective plate to the display device when the protective plate is peeled off from the display device. It has been found that display devices cannot be reused as they are. That is, the repair efficiency may be deteriorated.

<Second Conventional Example>
(Substrate distortion)
Conventionally, Patent Document 2 discloses a technique in which UV irradiation is performed in a state where a back surface of a curable resin layer for filling a step generated by a decorative layer is pressed flat. Specifically, as shown in FIG. 10, in the state where the curable resin layer 104 is filled on the inner side and upper surface of the step of the decorative layer 103 formed on the protective plate, that is, the substrate 102, the curable resin layer 104 is further formed. With the separator film 107 disposed on the back surface, the back surface of the curable resin layer 104 is pressed by the separator film 107 by passing the substrate 102 between a pair of upper and lower rollers 112. At the same time, the curable resin layer 104 in a pressed state is cured by applying an ultraviolet ray R to the curable resin layer 104 by a UV irradiation device 113 provided in the vicinity of the exit of the upper and lower rollers 112.

  In Patent Document 2, as shown in FIG. 9, a plurality of decorative patterns 103a are formed on a large substrate 102, and a curable resin layer is provided on the decorative patterns 103a to provide a large substrate. A method of manufacturing a plurality of display device protection plates by forming a plurality of display device protection plates on 102 and then cutting the display device protection plates is disclosed.

  In this conventional manufacturing method, the substrate 102 or the separator film 107 may be affected by the pressing force of the upper and lower rollers 112 to generate a wavy distortion as shown in FIG. Further, as shown in FIG. 12, there is a possibility that the substrate 102 is distorted due to the influence of the curing shrinkage C that occurs when the curable resin layer 104 that is a curable resin is cured. These distortions are considered to be caused by the substrate 102 passing between the rollers 112 in the state of one sheet in FIG.

  In order to prevent the occurrence of such distortion of the base material 102, it is necessary to impart rigidity and strength capable of withstanding the pressing force of the roller 112 to at least one of the substrate 102 and the separator film 107. Thus, in order to increase the rigidity and strength of the substrate 102 and the separator film 107, their thicknesses must be increased. In addition, in order to produce a thin and low-rigidity protective plate for a display device, it is necessary to devise such as passing the substrate 102 between the upper and lower rollers 112 together with another material having high rigidity.

JP 2010-176111 A Japanese Patent No. 4640626

  The present invention has been made in view of the first conventional example, and is cured when the step formed when the decorative layer is formed on the protective plate is eliminated by the curable resin layer. It is a first object of the present invention to provide a manufacturing method and a manufacturing apparatus for a protective plate for a display device that can maintain high adhesiveness and adhesion between the adhesive resin layer and the adhesive layer (for example, double-sided tape).

  The present invention has been made in view of the second conventional example, and provides a manufacturing method and a manufacturing apparatus of a protective plate for a display device that can prevent the display device protective plate from being distorted. Is the second purpose.

  1st aspect of the manufacturing method of the protection plate for display apparatuses which concerns on this invention is a process which conveys the base material in which the decorating layer was formed, applying tension | tensile_strength pulled along a conveyance direction, and a conveyance direction. A step of conveying while applying a tension pulled along the step, a step of supplying a curable resin to the surface of the base material on which the decorative layer is formed, and a step of bonding the curable resin and the adhesive And a step of curing the curable resin to which the adhesive is bonded.

Next, the second aspect of the manufacturing method of the protective plate for display device according to the present invention includes a step of conveying the base material on which the decorative layer is formed while applying tension that is pulled along the conveying direction, and an adhesive. A step of conveying while applying tension pulled along the conveying direction, a step of supplying a curable resin to the pressure-sensitive adhesive, and a step of bonding the curable resin and the surface of the base material on the decorative layer side And a step of curing the curable resin to which the substrate is bonded.

  In the manufacturing method of said 1st aspect, curable resin was supplied to the surface in which the decorating layer was formed among the base materials. On the other hand, in the manufacturing method of said 2nd aspect, curable resin is supplied to an adhesive instead of supplying curable resin to a base material.

  Next, a first aspect of the display device protection plate manufacturing apparatus according to the present invention includes means for transporting the base material on which the decorative layer is formed while applying tension that is pulled along the transport direction, and an adhesive. A means for conveying the substrate while applying tension pulled along the conveying direction, a means for supplying a curable resin to the surface of the base material on which the decorative layer is formed, and the curable resin and the adhesive. It has a means to bond, and a means to harden said curable resin with which said adhesive was bonded together, It is characterized by the above-mentioned.

Next, a second aspect of the display device protection plate manufacturing apparatus according to the present invention includes a means for transporting the base material on which the decorative layer is formed while applying tension to be pulled along the transport direction, and an adhesive. Means for conveying the film while applying tension pulled along the conveying direction, means for supplying a curable resin to the adhesive, and means for bonding the curable resin and the surface of the base material on the decorative layer side And means for curing the curable resin to which the substrate is bonded.

  In Patent Document 2, as shown in FIG. 10 of the present application, the base material 102 is conveyed in the form of a sheet instead of a roll. For this reason, there is a possibility that distortion as shown in FIG. In contrast, in the method and apparatus for manufacturing a protective plate for a display device of the present invention, as shown in FIG. 2, FIG. 4, FIG. 5, or FIG. 6, the substrate 2 and the adhesive 5 are conveyed while being pulled by tension. Is done. Thus, the base material 2 and the adhesive 5 that are pulled by tension are always transported while maintaining flatness. For this reason, it can prevent that distortion generate | occur | produces in the base material 2, the adhesive 5, and the various film elements provided among them, and can prevent that distortion generate | occur | produces as a whole in the protective plate for display apparatuses as a result. .

  Moreover, in patent document 2, as shown in FIG.8 (b) of this application, the curable resin 104 is hardened in the state which stuck the separator film 107 to the curable resin 104, and the adhesion layer 109 in FIG.8 (c) is shown. Was formed by attaching the adhesive tape 109 after the separator film 107 was peeled off. On the other hand, in the present invention, as shown in FIG. 2, FIG. 4, FIG. 5 or FIG. 6, the adhesive 5 is bonded to the curable resin 4 before the curable resin 4 is cured by receiving the ultraviolet ray R. The curable resin 4 is cured by the ultraviolet ray R in a state where the adhesive 5 and the curable resin 4 are bonded together.

  According to the display device protection plate manufactured by the manufacturing method or the manufacturing apparatus of the present invention, the entire display device protection plate can be bonded to the surface of the display device by the adhesive layer. Thereby, the protection board for display apparatuses is arrange | positioned on the surface of a display apparatus. According to the present invention, the adhesive layer is bonded to the curable resin before the curable resin is cured, and the curable resin is cured after the bonding, so that the curable resin and the adhesive layer are firmly attached to each other. Join.

  Since the curable resin and the adhesive layer are firmly bonded to each other, in the present invention, the substrate and the adhesive layer are bonded to each other by the curable resin, and the decorative layer and the adhesive layer are further bonded to each other by the curable resin. The Thereby, the adhesiveness and adhesiveness of a curable resin layer and an adhesion layer (for example, double-sided tape) can be kept in a high state.

  In the manufacturing method and the manufacturing apparatus of the protective plate for a display device according to the present invention, the curable resin layer is cured while being transported while the substrate and the pressure-sensitive adhesive layer are tensioned along the transport direction. be able to. With this configuration, it is possible to prevent distortion of the substrate or the like that occurs when a sheet-like base material is passed between rollers.

  In the method and apparatus for manufacturing a protective plate for a display device according to the present invention, the substrate and the pressure-sensitive adhesive layer are transported from the roll unwinding side to the roll winding side, whereby the tension pulled along the transporting direction is determined. Can be applied to the substrate and the adhesive layer. According to this configuration, uniform tensile tension can be generated.

  In the method and apparatus for manufacturing a protective plate for a display device according to the present invention, the curable resin may be a photocurable resin that is cured by receiving light, for example, an ultraviolet curable resin. As the curable resin, a resin other than the photocurable resin, such as a thermosetting resin, can be considered, and the photocurable resin is suitable for roll conveyance.

  In the manufacturing method and the manufacturing apparatus of the protective plate for a display device according to the present invention, the tension (F1) in the direction opposite to the traveling direction is applied to the substrate to which the curable resin is supplied or the adhesive to which the curable resin is supplied. The composite material formed by laminating the base material, the decorating material, the curable resin, and the adhesive layer can be tensioned (F2) in the traveling direction. By so doing, it is possible to reliably prevent the display device protection plate from being distorted.

  In the manufacturing method and the manufacturing apparatus of the protective plate for a display device according to the present invention, the curable resin supplied on the base material or the pressure-sensitive adhesive is brought to a uniform height by a scraping member before the bonding step. Can be molded. Thereby, it can prevent that unnecessary quantity of curable resin is sent in to the process of bonding curable resin and an adhesive.

  According to the method and apparatus for manufacturing a protective plate for a display device according to the present invention, the adhesive layer is bonded to the curable resin before the curable resin is cured, and the curable resin is cured after the bonding. The curable resin and the adhesive layer are firmly bonded to each other. For this reason, a board | substrate and an adhesion layer are mutually adhere | attached by curable resin, and also a decorating layer and an adhesion layer are mutually adhere | attached by curable resin. Thereby, the adhesiveness and adhesiveness of a curable resin layer and an adhesion layer can be kept in a high state. As a result, it is possible to prevent sticking of the pressure-sensitive adhesive forming the adhesive layer and peeling off of the protective plate for display device when cutting out the protective plate for individual display device by cutting from the large protective plate for display device. High efficiency can be maintained.

  According to the manufacturing method and the manufacturing apparatus of the protection plate for a display device according to the present invention, an appropriate tension is applied to the base material along the transport direction. Due to this tension, the substrate is always transported while maintaining flatness even if it is not specially pressed. For this reason, it can prevent that a distortion | strain generate | occur | produces in a base material, As a result, it can prevent that a distortion | strain generate | occur | produces in the whole protective plate for display apparatuses.

It is a figure which shows one Embodiment of the protective plate for display apparatuses manufactured with the manufacturing method and manufacturing apparatus which concern on this invention, (a) shows sectional drawing, (b) has shown the top view. It is a figure which shows the side surface structure of one Embodiment of the apparatus which enforces the manufacturing method of the protection plate for display apparatuses which concerns on this invention. FIG. 3 is a plan view of the apparatus of FIG. 2. It is a figure which shows the side surface structure of other embodiment of the apparatus which enforces the manufacturing method of the protection board for display apparatuses which concerns on this invention. It is a figure which shows the side surface structure of other embodiment of the apparatus which enforces the manufacturing method of the protection board for display apparatuses which concerns on this invention. It is a figure which shows the side surface structure of other embodiment of the apparatus which enforces the manufacturing method of the protection board for display apparatuses which concerns on this invention. It is sectional drawing which shows an example of the conventional protective plate for display apparatuses. It is sectional drawing which shows another example of the conventional protective plate for display apparatuses. It is a top view of an example of the decorating film used with the manufacturing method of the conventional protective plate for display apparatuses. It is a figure which shows the side structure of an example of the apparatus which enforces the manufacturing method of the conventional protective plate for display apparatuses. It is a figure which shows an example of the use condition of the apparatus of FIG. It is a figure which shows another example of the use condition of the apparatus of FIG.

  Hereinafter, a manufacturing method and a manufacturing apparatus of a protective plate for a display device according to the present invention will be described based on embodiments. Of course, the present invention is not limited to this embodiment. In addition, in the drawings attached to the present specification, components may be shown in different ratios from actual ones in order to show characteristic parts in an easy-to-understand manner.

  FIG. 1 shows an embodiment of a protective plate for a display device manufactured by a manufacturing method and a manufacturing apparatus according to the present invention. FIG. 1A is a cross-sectional view, and FIG. 1B is a plan view. In FIG. 1, the display device protection plate 1 of the present embodiment includes a base material 2, a decorative layer 3 formed on the base material 2, a region without the decorative layer 3, and the decorative layer 3. And a pressure-sensitive adhesive layer 5 provided so as to cover the curable resin layer 4.

  In addition, in this specification, the decorating material which forms the decorating layer 3 may be shown with the same code | symbol "3", and the curable resin which forms the curable resin layer 4 is the same code | symbol "4". The pressure-sensitive adhesive forming the pressure-sensitive adhesive layer 5 may be denoted by the same symbol “5”.

  The display device protection plate 1 is a member that prevents the surface of the display device 6 (for example, a mobile phone, a smart phone, a mobile terminal, a flat panel display device, etc.) from being damaged. When the display device 6 includes a touch panel, the touch panel is often disposed on the surface of the display device 6, and in that case, the display device protection plate 1 is provided on the surface of the touch panel. The display device protection plate 1 is adhered to the surface of the display device 6 by an adhesive layer 5.

(Substrate 2)
The substrate 2 is a film that is a main part of the protective plate 1 for display devices, and is formed of a transparent synthetic resin or glass. As the transparent synthetic resin, for example, polyethylene terephthalate, polycarbonate, acrylic, or the like is used. The base material 2 is formed by combining (that is, mixing) or laminating various synthetic resins and glass. Since the base material 2 is wound in a roll shape as described later, it is necessary to have both flexibility and rigidity, and for that purpose, the thickness is preferably 0.5 mm or less.

(Adhesive layer 5)
The adhesive layer 5 is an adhesive layer or an adhesive layer. The adhesive layer 5 is formed of, for example, acrylic, an acrylic compound, urethane, a urethane compound, silicone, a silicone compound, or the like. A separator film for maintaining the shape of the adhesive layer 5 is laminated on one surface or both surfaces of the adhesive layer 5.

(Curable resin 4)
The curing method of the curable resin 4 is preferably an ionizing radiation curable compound from the viewpoint of productivity, and an ultraviolet curable compound is preferable from the viewpoint of the productivity of the radiation. As the “ionizing radiation curable compound”, unsaturated monomers, oligomers, resins or compositions containing them are preferable. Specifically, an ultraviolet acrylate compound is preferable. As the acrylate compound, urethane acrylate, epoxy acrylate, silicon acrylate and the like are common.

  Examples of the wavelength of radiation for “ionizing radiation curing” include ultraviolet rays, electron beams, α rays, γ rays, and the like. When ultraviolet rays are used as the ionizing radiation curing wavelength, it is preferable to contain a photopolymerization initiator. As the “photopolymerization initiator”, known photopolymerization initiators such as acetophenine series and benzophenine series can be used. Moreover, an oligomer type photoinitiator can also be used.

(Application method)
Examples of the method for applying the curable resin layer 4 to the substrate 2 include a barcode method, a knife coating method, a roll coating method, a blade coating method, a die coating method, and a gravure coating method. Moreover, when the base material 2 with a decoration layer is a sheet | seat, conventionally well-known methods, such as a screen printing method and a dispenser coating method, are mentioned.

(Curing resin application and curing conditions)
The liquid viscosity of the curable resin for filling the stepped portion on the substrate 2 with the curable resin 4 and forming a coating film with a blade is preferably 100 mpa · s to 100,000 mpa · s. From the viewpoint of productivity such as reducing the influence on the flatness due to the fluidity of the curable resin due to the pressing of the upper and lower rollers after application, and the filter removal process for removing foreign matter from 500 mpa · s to 50,000 mpa · s (25 ° C.) is more preferable.

  The reason for the above numerical limitation is as follows. That is, when the viscosity is too low, the fluidity of the liquid is high, the liquid flows by pressing the upper and lower rollers, and the flatness of the stepped portion by the decorative layer is impaired. Further, when the viscosity is too high, there is a concern that the liquid foreign matter removing filter may not be passed.

Also in the dose of conditions of the ultraviolet UV curing step is preferably 5000 mJ / cm ² or less, productivity, considering the influence on the material to ultraviolet radiation heat, 1000 mJ / cm ² or less being more preferred.

  In the display device protection plate 1 of the present embodiment shown in FIG. 1, the adhesive layer 5 is bonded to the curable resin layer 4 before curing, and the curable resin layer 4 is bonded to the adhesive layer 5, for example, It is cured by an ultraviolet curing process or the like. For this reason, the base material 2 and the adhesive layer 5 are firmly bonded to each other by the curable resin layer 4, and the decorative layer 3 and the adhesive layer 5 are firmly bonded to each other by the curable resin layer 4. And thereby, the adhesiveness and adhesiveness of the curable resin layer 4 and the adhesion layer 5 can be kept in a high state.

(First Embodiment of Manufacturing Method and Manufacturing Device for Display Device Protection Plate)
Hereinafter, a manufacturing method and a manufacturing apparatus of a protective plate for a display device according to the present invention will be described based on embodiments. Of course, the present invention is not limited to this embodiment. In addition, in the drawings attached to the present specification, components may be shown in different ratios from actual ones in order to show characteristic parts in an easy-to-understand manner.

  FIG. 2 shows a cross-sectional configuration of an embodiment of a display device protection plate manufacturing apparatus according to the present invention. FIG. 3 shows a plan configuration of an embodiment of the manufacturing apparatus. The manufacturing apparatus 11 of this embodiment includes a first roll unwinding device 12, a resin coating device 13, rollers 14a and 14b as adhesive layer laminating devices, an ultraviolet irradiation device 15 as a resin curing device, and a roll winding. Device 16. The apparatus of the present embodiment employs a roll-to-roll (Roll to Roll) conveyance mode that unwinds the input material from the roll state and winds the processed film into the roll state.

  The first roll unwinding device 12 has a function of holding a decorative film 19 in which the decorative layer 3 is formed on the substrate 2 in a roll shape and unwinding (that is, sending out) the decorative film 19 in a straight line. Fulfill. The unwrapped decorative film 19 is formed into a composite material 22 to be described later, and then wound up by the roll winding device 16. Specifically, the roll winding device 16 winds the composite material 22 with a predetermined driving force by a power source such as a motor. The first roll unwinding device 12 is driven to rotate while exhibiting a predetermined braking force.

  A doctor blade 20 is provided at a position downstream of the resin coating device 13 along the conveying direction of the decorative film 19. The resin coating device 13 supplies a predetermined amount of the curable resin 4 to the surface of the decorative film 19. The supplied curable resin 4 is regulated to a certain height by the doctor blade 20.

  The 2nd roll unwinding device 21 is provided in the position of the upstream of the adhesion layer lamination | stacking rollers 14a and 14b along the conveyance direction of the decorating film 19. FIG. The second roll unwinding device 21 holds the pressure-sensitive adhesive 5 in a roll shape, and further realizes a function of feeding the roll-shaped pressure-sensitive adhesive 5 in a linear shape. A separator for maintaining the shape of the pressure sensitive adhesive itself is bonded to one surface of the pressure sensitive adhesive 5. The unrolled adhesive 5 is bonded to the curable resin 14 at the rollers 14a and 14b. At this time, no separator is attached to the surface of the pressure-sensitive adhesive 5 bonded to the curable resin 14.

  The composite material 22 which is a laminated body of the base material 2, the decoration layer 3, the curable resin layer 4, and the adhesive 5 is formed by the action of the rollers 14a and 14b. Then, the composite material 22 is sent out to the position on the downstream side of the rollers 14a and 14b. The composite material 22 is taken up by the roll take-up device 16. Before the composite material 22 is taken up by the roll take-up device 16, the ultraviolet ray R emitted from the ultraviolet irradiation device 15 is applied to the composite material 22, particularly the curable resin layer 4. Thereby, the curable resin layer 4 is cured.

  The rollers 14 a and 14 b press the adhesive 5 against the curable resin layer 4. In this case, the pressing force is sufficient to allow the adhesive 5 to be attached to the curable resin layer 4, and need not be larger than necessary. If the pressing force is too large, the composite material 22 may be distorted. Therefore, it is not preferable to set the pressing force larger than necessary. Moreover, if the pressing force is reduced, the amount of the curable resin layer 4 protruding from the side portions of the base material 2 and the adhesive layer 5 can be suppressed.

  In the present embodiment, a composite material 22 is formed by the decorative film 19 sent from the first roll unwinding device 12 and the adhesive 5 sent from the second roll unwinding device 21, and this composite material 22 is formed into the roll winder 16. Decided to take up. That is, the base material 2 is transported by a roll transport method. For this reason, the tension F1 is applied to the decorative film 19 in the direction opposite to the conveying direction (that is, the traveling direction of the decorative film), while the tension F2 is applied to the composite material 22 in the same direction as the conveying direction.

Due to the effects of such tensions F1 and F2, tensile tension is always generated in the in-plane direction in the decorative film 19 and the composite material 22, and as a result, the flatness of the decorative film 19 and the composite material 22 is improved. Secured. Conventionally, as shown in FIG. 11, when the sheet material 102 is pressed by the roller 112, the sheet material 102 and the film element thereon are distorted. If the flatness of the decorative film 19 or the like is ensured, the occurrence of distortion can be reliably prevented. Thus, according to the present embodiment, the flatness is ensured by the tension of tension without pressing the composite material 22 more than necessary.

  In the present embodiment, there is no particular reason that the ultraviolet irradiation device 15 must be disposed immediately after the rollers 14a and 14b in FIG. When the composite material 22 is rolled, the composite material 22 receives an appropriate tensile tension at any position to ensure flatness. For this reason, there is no problem even if the rollers 14a and 14b and the ultraviolet irradiation device 15 are installed far away from each other. If the rollers 14a and 14b and the ultraviolet irradiation device 15 are installed apart from each other in this way, the ultraviolet rays emitted from the ultraviolet irradiation device 15 do not have any influence on the rollers 14a and 14b, which is very convenient. It is.

  Incidentally, in FIG. 2, if the rollers 14a and 14b and the ultraviolet irradiation device 15 are arranged close to each other, the rollers 14a and 14b may be irradiated with ultraviolet rays, which may adversely affect the rollers 14a and 14b. For example, there is a possibility that the rollers 14a and 14b may be deteriorated and the state where the curable resin layer 4 and the adhesive layer 5 are attached is deteriorated. In the present embodiment, the distance between the rollers 14a, 14b and the ultraviolet irradiation device 15 is set appropriately large so that the rollers 14a, 14b are not adversely affected.

  As described above, by appropriately setting the distance between the rollers 14a and 14b and the ultraviolet irradiation device 15, in this embodiment, when the curable resin 4 is cured by the ultraviolet R, the pressing force of the rollers 14a and 14b is reduced. The influence is almost eliminated, and the composite material 22 maintains the flatness by the tension.

  In the present embodiment, an unnecessary amount of the curable resin 4 is removed from the decorative film 19 by the doctor blade 20, and the curable resin 4 has a uniform planar height. Therefore, an appropriate amount of the curable resin 4 is always supplied at an appropriate height to the bonding stage by the rollers 14a and 14b. For this reason, the rollers 14a and 14b do not apply a pressing force more than necessary to the curable resin 4, and a pressing force is applied so that the curable resin 4 and the adhesive layer 5 are adhered evenly in a plane.

(Second Embodiment of Manufacturing Method and Manufacturing Apparatus for Display Device Protection Plate)
FIG. 4 shows a second embodiment of the display device protection plate manufacturing apparatus according to the present invention. In the embodiment of FIG. 4, the same members as those of the embodiment shown in FIG. 2 are denoted by the same reference numerals, and description thereof is omitted.

  In the first embodiment shown in FIG. 2, the decorative film 19 is sent out from the first roll unwinding device 12, the curable resin 4 is applied to the decorative film 19, and is sent out from the second roll unwinding device 21. The adhesive 5 was bonded to the curable resin 4 by rollers 14a and 14b. On the other hand, in the present embodiment shown in FIG. 4, the adhesive 5 is sent out from the first roll unwinding device 12, the curable resin 4 is applied to the adhesive 5, and is sent out from the second roll unwinding device 21. The decorative film 19 was bonded to the curable resin 4 by the rollers 14a and 14b. Finally, as in the embodiment of FIG. 2, a composite comprising a base material 2, a decorative layer 3, a curable resin layer 4, and an adhesive layer 5 laminated at a position on the downstream side of the rollers 14 a and 14 b. A material 22 is formed.

(Third embodiment of manufacturing method and manufacturing apparatus of protective plate for display device)
FIG. 5 shows a third embodiment of the display device protection plate manufacturing apparatus according to the present invention. In the embodiment of FIG. 5, the same members as those of the embodiment shown in FIG. 2 are denoted by the same reference numerals, and description thereof is omitted.

  In the embodiment shown in FIG. 2, a configuration in which the decorative film 19 is sent out from the first roll unwinding device 12 and the composite material 22 is wound up by the roll winding device 16 is adopted. On the other hand, in this embodiment, the decorative film 19 is sent out from the first roll unwinding device 12, the composite material 22 is pulled and conveyed by the pulling rollers 24 a and 24 b, and the individual display devices are used by the cutting device 25. The structure which cut out the film containing several protection plates for a display apparatus arranged in the direction which penetrates the protection plate or the paper surface of FIG. 5 was employ | adopted.

  The pulling rollers 24a and 24b convey the composite material 22 while applying tension to the composite material 22 by rotating the composite material 22 between the front and back surfaces. At this time, since the curable resin 4 has already been cured by receiving the ultraviolet ray R from the ultraviolet irradiation device 15, the conveyance of the composite material 22 by the pulling rollers 24a and 24b is performed stably. Although the cutting device 25 is schematically illustrated in FIG. 5, the structure thereof can be arbitrarily set. For example, it is possible to adopt a configuration in which a cutting blade is reciprocated in a direction crossing the conveying direction of the composite material 22.

  Due to the functions of the first roll unwinding device 12, the second roll unwinding device 21, the sticking rollers 14a and 14b, and the pulling rollers 24a and 24b, the decorative film 19 on the input side is opposite to the transport direction. A tension F1 in the direction acts, and a tension F2 in the transport direction acts on the composite material 22 on the winding side.

(Fourth Embodiment of Manufacturing Method and Manufacturing Apparatus for Display Device Protection Plate)
FIG. 6 shows a fourth embodiment of the display device protection plate manufacturing apparatus according to the present invention. In the embodiment of FIG. 6, the same members as those of the embodiment shown in FIG. 5 are denoted by the same reference numerals, and the description thereof is omitted.

  In 3rd Embodiment shown in FIG. 5, the decorating film 19 is sent out from the 1st roll unwinding apparatus 12, the curable resin 4 is apply | coated to the decorating film 19, and it sends out from the 2nd roll unwinding apparatus 21. The adhesive 5 is bonded to the curable resin 4 by the rollers 14a and 14b, the curable resin 4 is cured by the ultraviolet ray R, and the composite material 22 is conveyed while tension is applied to the composite material 22 by the pulling rollers 24a and 24b. The composite material 22 was cut into a predetermined size by the cutting device 25.

  On the other hand, in the present embodiment shown in FIG. 6, the pressure-sensitive adhesive 5 is sent out from the first roll unwinding device 12, the curable resin 4 is applied to the pressure-sensitive adhesive 5, and is sent out from the second roll unwinding device 21. The decorative film 19 is bonded to the curable resin 4 by the rollers 14a and 14b, the curable resin 4 is cured by the ultraviolet ray R, and the composite material 22 is conveyed while tension is applied to the composite material 22 by the pulling rollers 24a and 24b. The composite material 22 was cut into a predetermined size by the cutting device 25.

Due to the functions of the first roll unwinding device 12, the second roll unwinding device 21, the adhering rollers 14a and 14b, and the pulling rollers 24a and 24b, the adhesive 5 on the input side is opposite to the conveying direction. Tension F1 acts on the take-up side composite material 22 and tension T2 in the transport direction acts on the winding side composite material 22.

  In other words, in the embodiment shown in FIG. 5, a configuration is used in which the decorative film 19 is sent out from the first roll unwinding device 12 and the adhesive 5 is sent out from the second roll unwinding device 21. On the other hand, in this embodiment, the adhesive 5 is sent out from the first roll unwinding device 12 and the decorative film 19 is sent out from the second roll unwinding device 21.

(Other embodiments)
The present invention has been described with reference to the preferred embodiments. However, the present invention is not limited to the embodiments, and various modifications can be made within the scope of the invention described in the claims.
For example, the curable resin 4 is not limited to the ultraviolet curable resin, and may be a photocurable resin that reacts to light other than ultraviolet rays, or may be a thermosetting resin instead of the photocurable resin.

  For example, when using a thermosetting resin, it can replace with the ultraviolet irradiation device 15 of FIG. 2, and can provide a heat dryer, for example, a hot air dryer, and an infrared dryer. The thermosetting resin can be cured by this heat drying apparatus. In addition, since a thermosetting resin takes time for hardening reaction compared with a photocurable resin, an aging process (curing time) for a fixed period is needed about a thermosetting resin. For this reason, if a thermosetting resin is wound up with a roll, the winding stress of a roll will generate | occur | produce in a bonding composite material with the hardening reaction of a thermosetting resin. Therefore, when using a thermosetting resin, it is preferable to perform sheet cutting rather than winding the thermosetting resin with a roll.

  In addition, when the sheet cutting is adopted, a process of aging them after stacking a certain amount of sheets after the sheet cutting is necessary. In addition, although the thermosetting resin is cured even in a normal temperature environment, it takes a long time to sufficiently cure. In order to accelerate the curing of the thermosetting resin, the thermosetting resin may be placed in an aging chamber of about 30 ° C to 80 ° C. The aging time is set to an optimum time depending on the performance of the thermosetting resin.

  Next, the decoration layer 3 may be one type of layer or a plurality of layers. By using a plurality of layers, it is possible to give a variety of patterns and displays to the protective plate 1 for display devices.

  1. 1. Display device holding plate, 2. base material; 3. decoration layer (decorative material), 4. curable resin layer (curable resin), 5. Adhesive layer (adhesive), Display device, 11. 11. Manufacturing apparatus for protective plate for display device, 12. first roll unwinding device; Resin coating device, 14a, 14b. 15. Roller (adhesive layer laminating device) 15. UV irradiation device (resin curing device), Roll winding device, 19. Decorative film, 20. Doctor blade, 21. 22. Second roll unwinding device; Composite, 24a, 24b. Tensioning roller 25. Cutting device, B. Transport direction, C.I. Curing shrinkage, F1, F2. Tension, R.I. Ultraviolet rays,

Claims (7)

A step of conveying the base material on which the decorative layer is formed while applying a tension pulled along the conveyance direction;
A process of transporting the adhesive while applying tension to be pulled along the transport direction;
Supplying a curable resin to the surface of the substrate on which the decorative layer is formed;
A step of bonding the curable resin and the pressure-sensitive adhesive;
And a step of curing the curable resin to which the pressure-sensitive adhesive is bonded. A step of conveying the base material on which the decorative layer is formed while applying a tension pulled along the conveyance direction;
A process of transporting the adhesive while applying tension to be pulled along the transport direction;
Supplying a curable resin to the adhesive;
Bonding the curable resin and the surface of the base material on the decorative layer side ;
And a step of curing the curable resin to which the substrate is bonded. A method for manufacturing a protective plate for a display device. The substrate to which the curable resin is supplied or the adhesive to which the curable resin is supplied is tensioned in the direction opposite to the traveling direction, and the substrate, the decorative layer , the curable resin, and the adhesive . 3. The method of manufacturing a protective plate for a display device according to claim 1, wherein a tension is applied in a traveling direction to the composite material formed by laminating layers.   The supplied curable resin is scraped off by a scraping member before the step of bonding, and is formed to have a uniform height. Of manufacturing protective plate for display device.   The method for manufacturing a protection plate for a display device according to any one of claims 1 to 4, wherein the curable resin is a photocurable resin that is cured by receiving light. Means for conveying the base material on which the decorative layer is formed while applying tension pulled along the conveying direction;
Means for transporting the adhesive while applying tension that is pulled along the transport direction;
Means for supplying a curable resin to the surface of the substrate on which the decorative layer is formed;
Means for bonding the curable resin and the adhesive;
And a means for curing the curable resin to which the pressure-sensitive adhesive is bonded. Means for conveying the base material on which the decorative layer is formed while applying tension pulled along the conveying direction;
Means for transporting the adhesive while applying tension that is pulled along the transport direction;
Means for supplying a curable resin to the adhesive;
Means for bonding the curable resin and the decorative layer side surface of the substrate ;
And a means for curing the curable resin to which the base material is bonded.

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