JP4872869B2 - Bonding method and method for producing laminate sheet for display - Google Patents

Description

  The present invention relates to a method of laminating a sheet with a conductive mesh having a conductive mesh for shielding electromagnetic waves and an adhesive body having an adhesive material layer, and in particular, between each conductive mesh and the adhesive material layer. It is related with the bonding method which can bond the sheet | seat with an electroconductive mesh which contains several electroconductive meshes, and extends in strip | belt shape, and an adhesive body, suppressing the mixing of the bubble to an inside effectively.

  The present invention also relates to a method for producing a laminate sheet for display, which is formed by bonding a sheet with a conductive mesh having a conductive mesh for shielding electromagnetic waves and an adhesive having an adhesive material layer. Manufacturing a display laminate sheet including a plurality of conductive meshes and extending in a strip shape, in which air bubbles are effectively prevented from being mixed between each conductive mesh and the adhesive layer It relates to a manufacturing method that can be performed.

  A display having an image display unit such as a plasma display panel (hereinafter also simply referred to as “PDP”) or a cathode ray tube (CRT) is widely used. In these displays, a plurality of sheet-like (film-like) sheet materials (film materials) each provided with various functions are arranged on the viewer side (front side) of the image display unit (for example, Patent Document 1).

  An example of the sheet material disposed on the front side of the PDP or CRT is an electromagnetic wave shielding sheet. The electromagnetic wave shielding sheet is a sheet material for shielding unnecessary electromagnetic waves radiated from the image display unit. In a widely prevalent form, the electromagnetic wave shielding sheet includes a transparent base and a conductive mesh formed on one surface of the base. In order to impart excellent electromagnetic wave shielding properties to the electromagnetic wave shielding sheet, the height (thickness) of the conductive mesh is preferably higher (thick).

Therefore, in the case of producing a display member by bonding another sheet material to the conductive mesh side of such an electromagnetic wave shielding sheet, an electromagnetic wave shielding sheet, and an adhesive body that is a laminate of an adhesive material layer and a sheet material, When these are simply laminated, bubbles easily enter between them. This bubble diffuses and reflects light based on the difference in refractive index from the surroundings, so that it is observed as a white cloudy point (white cloud point) when the display member is incorporated in the display. The presence of such a cloudy point becomes a serious defect as a display. Under the present circumstances, in order to avoid such a malfunction, the autoclave process (patent document 2) is further given with respect to the electromagnetic wave shielding sheet and adhesive body which were piled up mutually.
JP 2005-22365 A JP-A-5-329355

  By the way, sheet materials such as electromagnetic wave shielding sheets are generally manufactured in a state where they are continuously arranged on the base material and connected to each other by performing various treatments on the base material extending in a strip shape. It will be done. According to such a method, handling of the processing object can be made extremely highly productive and easy as compared to manufacturing the sheet material one by one from the sheet material. In addition, the configuration of the apparatus used for processing can be greatly simplified. The display member is also generally manufactured using such a web-like sheet material, and is manufactured as a display laminate sheet continuously arranged on the base material and connected to each other. . According to such a method, the display member can be manufactured at high speed and high efficiency by a simplified apparatus. Further, by handling the display member as a display laminate sheet, it is possible to greatly increase the speed and efficiency of the process in the subsequent process for each manufactured display member.

  On the other hand, as disclosed in Patent Document 2, the autoclave process is performed with the object to be processed housed in a pressurized container. Therefore, when the autoclave treatment is performed on the electromagnetic shielding sheets and sheet materials that are superimposed on each other, the electromagnetic shielding sheets and the adhesive body that are superimposed on each other should be cut into sheets before being stored in at least the pressurized container. There must be. That is, by providing an autoclave process, not only the number of overall processing steps is increased, but also the display member after the autoclave process is in the form of a single wafer that is complicated to handle, so the process is intermittent. Production process is reduced. And the process in each process after an autoclave process cannot be produced continuously, but is complicated.

  Here, a sheet with a conductive mesh including a plurality of conductive meshes and extending in a strip shape and an adhesive body are pasted while effectively suppressing the mixing of bubbles between each conductive mesh and the adhesive material layer. If it can be combined, it is very convenient. In this case, not only the autoclave process can be omitted, but also the complexity of the subsequent handling of the display member (display laminate sheet) can be greatly reduced.

  The present invention has been made in view of the above points. The conductive material including a plurality of conductive meshes and extending in a band shape while effectively suppressing the mixing of bubbles between each conductive mesh and the adhesive material layer. It aims at providing the bonding method which can bond a sheet | seat with a property mesh, and an adhesive body.

  Further, the present invention is a display laminate sheet including a plurality of conductive meshes and extending in a band shape, and for a display in which mixing of bubbles between each conductive mesh and an adhesive material layer is effectively suppressed. It aims at providing the manufacturing method which can manufacture a laminated body sheet.

  A bonding method according to the present invention includes a base material having a longitudinal direction and extending in a strip shape, and a conductive mesh including a plurality of conductive meshes arranged on one surface of the base material along the longitudinal direction of the base material. A sheet including a sheet material and an adhesive body including an adhesive material layer laminated on the sheet material, the conductive mesh of the sheet with the conductive mesh and the adhesive body of the adhesive body A first step of superimposing the conductive mesh-attached sheet and the pressure-sensitive adhesive body so as to face each other, and a step performed after the first step, wherein the conductive layers overlapped with each other A temperature higher than the temperature when the mesh-attached sheet and the pressure-sensitive adhesive body are overlapped in the first step between the metal roll and the rubber roll arranged opposite to each other, and the first step. A second step of gradually pressurized at a pressure higher than the pressure at the time of overlaying, characterized in that it comprises a.

  In the second step of the bonding method according to the present invention, the metal roll is heated by a heating mechanism, whereby in the second step, the sheet with conductive mesh and the pressure-sensitive adhesive body are overlapped in the first step. The pressure may be increased by heating to a temperature higher than the temperature at the time of heating. In the first step of the bonding method according to the present invention, the sheet with the conductive mesh and the pressure-sensitive adhesive body may be passed through a pair of rolls in a normal temperature state and overlap each other. .

  Moreover, in the said 2nd process of the bonding method by this invention, the said sheet | seat with an electroconductive mesh may be located in the said rubber roll side, and you may make it the said adhesive body be located in the said metal roll side.

  Furthermore, in the bonding method by this invention, you may make it the said sheet | seat material be a peeling sheet which has peelability with respect to the said adhesive material layer.

  Further, in the first step of the bonding method according to the present invention, one sheet-like adhesive body faces each of the conductive meshes, and a plurality of sheet-like adhesive bodies form one conductive mesh. The sheets may be sequentially overlapped with the attached sheets.

  A method of manufacturing a laminate sheet for display according to the present invention includes a base material having a longitudinal direction and extending in a strip shape, and a plurality of conductive meshes arranged on one surface of the base material along the longitudinal direction of the base material. A sheet with a conductive mesh containing, and a pressure-sensitive adhesive layer including a pressure-sensitive adhesive layer laminated on the sheet material and the sheet material, to produce a laminate sheet for display, the conductive mesh After the first step, the first step of overlapping the sheet with the conductive mesh and the pressure-sensitive adhesive body so that the conductive mesh of the attached sheet faces the pressure-sensitive adhesive layer of the pressure-sensitive adhesive body It is a process to be performed, and the conductive mesh-attached sheet and the pressure-sensitive adhesive body, which are superposed on each other, are placed between a metal roll and a rubber roll arranged to face each other. A second step of gradually pressurized at a pressure higher than the pressure at the time of superimposing a high temperature and the first step than the temperature at the time of superimposed serial first step, characterized in that it comprises a.

  According to the present invention, the first step of stacking the sheet with the conductive mesh and the pressure-sensitive adhesive body, the sheet with the conductive mesh at a temperature higher than the temperature in the first step and higher than the pressure in the first step, and A second step of pressurizing the pressure-sensitive adhesive body. In the first step, the conductive mesh-attached sheet and the pressure-sensitive adhesive body can be accurately positioned and overlapped with each other. On the other hand, in the second step, bubbles mixed between each conductive mesh and the adhesive material layer can be effectively miniaturized or eliminated. As described above, the display laminate sheet includes a plurality of conductive meshes and extends in a strip shape, and mixing of bubbles between each conductive mesh and the adhesive layer is effectively suppressed. Display laminate sheet can be manufactured with higher productivity compared to conventional autoclave treatment.

BEST MODE FOR CARRYING OUT THE INVENTION

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In the drawings attached to the present specification, for the sake of illustration and ease of understanding, the scale and vertical / horizontal dimension ratios are appropriately changed and exaggerated as appropriate.

  The embodiments described below are examples in which the present invention is applied to a plasma display. However, the present invention is not limited to this, and the present invention can be widely applied to various display devices such as a display device using a CRT.

  Drawing 1 thru / or Drawing 5 are figures for explaining one embodiment of the manufacturing method of the pasting method by the present invention, the pasting device, and the laminated sheet for displays. 1 is a cross-sectional view showing an example of a display laminate sheet (display member), FIG. 2 is a plan view showing the display laminate sheet (display member), and FIG. 3 is a display laminate. It is a top view which shows an example of the sheet | seat with an electroconductive mesh used for manufacture of a body sheet, and FIG. 4 and FIG. 5 is the bonding apparatus for implementing the bonding method and such a bonding method, and a laminated body for a display. It is a figure for demonstrating the manufacturing method of a sheet | seat. The cross section shown in FIG. 1 corresponds to the cross section taken along the line II in FIG.

  As shown in FIG. 1 thru | or FIG. 5, the bonding method demonstrated below bonds the sheet | seat 20 with the electroconductive mesh containing the some electroconductive mesh 26, and the adhesive body 40 containing the adhesive material layer 44. As shown in FIG. The laminate sheet 10 for display is manufactured. First, the sheet | seat 20 with an electroconductive mesh and the adhesive body 40 used as bonding object are demonstrated.

  Among these, the sheet | seat 20 with an electroconductive mesh is extended along the longitudinal direction of the base material 24 on one surface 24a of the web-like base material 24 which extends in strip | belt shape and has a longitudinal direction, as shown in FIG. A plurality of conductive meshes 26 formed side by side. In addition, the conductive mesh-attached sheet 20 is provided corresponding to each conductive mesh 26, arranged around the corresponding conductive mesh 26, and electrically conductive peripheral edges electrically connected to the conductive mesh 26. A part 28 is further provided. The sheet 20 with the conductive mesh is so-called electromagnetic shielding by cutting the web-like base material 24 for each conductive mesh 26, for example, by cutting the web-like base material 24 along the alternate long and short dash line in FIG. The sheet 22 is configured.

  The electromagnetic wave shielding sheet 22 includes a sheet-like base material 25 formed by cutting a web-like base material 24, a conductive mesh 26 provided on the base material 25, Peripheral edge 28 connected to each other.

  The electromagnetic wave shielding sheet 22 is incorporated into a plasma display, for example, and can be used by being arranged on the viewer side (front side) of the plasma display panel (PDP). The PDP constitutes an image display unit of a plasma display. The PDP has two glass substrates, and a rare gas is filled between the two glass substrates. Then, plasma is generated in the rare gas atmosphere, and ultraviolet light generated at this time is applied to the phosphor to generate visible light for each pixel. As described above, unnecessary electromagnetic waves are also radiated from the PDP as the ultraviolet rays are emitted. The electromagnetic wave shielding sheet 22 functions as a filter for shielding electromagnetic waves in the MHz to GHz band radiated from the PDP (that is, “electromagnetic waves” here is a concept that does not include near infrared rays or ultraviolet rays).

  The base materials 24 and 25 support the conductive mesh 26 as described above and are arranged on the viewer side of the PDP. Therefore, the base materials 24 and 25 are appropriately configured so as to have appropriate strength and appropriate transparency. Commonly used base materials 24 and 25 have a thickness of 20 μm to 150 μm, and a light transmittance of 80% or more. As such base materials 24 and 25, for example, a biaxially stretched polyethylene terephthalate (PET) film can be used. The biaxially stretched polyethylene terephthalate film is suitable for application as the base materials 24 and 25 in that it has appropriate transparency and durability against ultraviolet irradiation treatment, heat treatment and the like.

  In addition, the conductive mesh 26 is configured by conductive line portions 26 a protruding from the one surfaces 24 a and 25 a of the base materials 24 and 25. The line part 26a is formed on one surface 24a, 25a of the base material 24, 25 in a desired mesh pattern. The line part 26 a is electrically connected to the peripheral part 28. The peripheral portion 28 is grounded, so that the conductive mesh 26 disposed on the front surface of the PDP exhibits an electromagnetic wave shielding function. Such a conductive mesh 26 and the peripheral portion 28 are formed by, for example, laminating a conductive metal foil on a base material and etching the foil in a desired pattern, or conductive in a resin binder on the base material. It can be formed on a substrate by a conventionally known method such as a method of printing a conductive ink in which metal particles are dispersed in a desired pattern.

  Next, the adhesive body 40 will be described. For example, as shown in FIG. 4, the adhesive body 40 includes an adhesive material layer 44 and a sheet material 42 bonded to the adhesive material layer 44.

  As described above, a sheet material other than the electromagnetic wave shielding sheet 22 is also laminated on the viewer side of the image display unit of the display. Then, before the electromagnetic wave shielding sheet 22 is incorporated in the display, these sheet materials 42 are bonded to the electromagnetic wave shielding sheet 22 through the adhesive material layer 44, and the display member including the electromagnetic wave shielding sheet 22 and the sheet material 42. May be handled as 12. For example, the sheet material 42 laminated on the viewer side of the PDP includes various front filters for shielding radiation radiated from the PDP, a functional sheet provided with an optical function, a protective function, and the like. . Examples of the front filter include a near-infrared shielding sheet, a neon light shielding sheet, and an ultraviolet (UV) shielding sheet. Examples of the functional sheet include an antireflection sheet, an antiglare sheet, a hard coat sheet, an antifouling sheet, and an antistatic sheet.

  Further, the sheet material 42 referred to in this case also includes a release sheet 43 a having releasability from the adhesive material layer 44. And the adhesive material layer 44 may be laminated | stacked on the electromagnetic wave shielding sheet 22 with the sheet | seat material 42 which consists of the peeling sheet 43a. In this case, another sheet material 42 can be laminated on the electromagnetic wave shielding sheet 22 through the exposed adhesive material layer 44 by peeling the release sheet 43a from the adhesive material layer 44 adhered to the electromagnetic wave shielding sheet 22. It becomes.

  The pressure-sensitive adhesive body 40 including such a pressure-sensitive adhesive layer 44 and the release sheet 43a is obtained as follows, for example. First, an adhesive material composition is applied onto a release sheet and dried. Thereby, the adhesive layer 44 is formed on the release sheet. Next, another release sheet is laminated on the exposed surface of the adhesive layer 44. Thereby, the adhesive sheet 45 which has the adhesive material layer 44 and a pair of peeling sheet 43a, 43b each laminated | stacked on both sides of this adhesive material layer 44 is formed. And the adhesive body 40 containing the adhesive material layer 44 and the peeling sheet 43a is obtained by peeling one peeling sheet 43b from this adhesive sheet 45 in the timing as needed (refer FIG. 4).

  The adhesive material layer 44 can be formed of a conventionally known material such as an acrylic adhesive material. Further, the sheet material 42 as the release sheet 43a is, for example, a sheet (film) formed by release treatment on one surface of a polyethylene terephthalate (PET) film, or silicone or the like on one surface of a polyethylene terephthalate (PET) film. A conventionally known release sheet (release sheet) such as a sheet (film) formed by laminating a release layer composed of the above can be employed.

  Next, the sheet | seat 20 with an electroconductive mesh which consists of the above structures, and the adhesive body 40 are bonded, and the method of manufacturing the laminated body sheet | seat 10 for a display extended in strip | belt shape is used for this bonding. The description will be made together with the combined device 50 mainly with reference to FIGS.

  As shown in FIG. 5, the laminating method (the manufacturing method of the laminated sheet for display) is as shown in FIG. The second step of heating and pressurizing the temporarily attached sheet 20 with conductive mesh and the pressure-sensitive adhesive body 40 is provided. Corresponding to such a bonding method, the bonding apparatus 50 is overlapped with the first means 60 for overlapping the sheet 20 with the conductive mesh and the adhesive body 40 as shown in FIGS. 4 and 5. And a second means 70 that is arranged downstream of the means 60 and pressurizes the laminate 11 in which the conductive mesh-attached sheet 20 and the pressure-sensitive adhesive body 40 are stacked and temporarily attached. The bonding apparatus 50 further includes a control device 55 that is electrically connected to the first means 60 and the second means 70 and controls the first means 60 and the second means 70.

  First, a temporary sticking process (1st process) is demonstrated, mainly referring FIG. As shown in FIG. 4, the 1st means 60 of the bonding apparatus 50 has a pair of nip rolls 61 and 62 arrange | positioned facing each other.

  As shown in FIG. 4, in the present embodiment, the web-like conductive mesh-attached sheet 20 extending in a band shape is supplied to the laminating apparatus 50 as a wound body wound around the supply core 65. The supply core 65 is rotationally driven, whereby the conductive mesh-attached sheet 20 is unwound from the wound body and supplied. At this time, the supply direction of the sheet 20 with the conductive mesh is along the longitudinal direction of the web-like substrate 24. As shown in FIG. 4, the supplied conductive mesh-attached sheet 20 is fed between the pair of nip rolls 61 and 62 of the first means 60 by the conveying roller 66.

  In parallel with the supply of the sheet 20 with the conductive mesh, the adhesive body 40 is also supplied. As shown in FIGS. 3 and 4, in the present embodiment, a sheet-like adhesive body 40 having a size corresponding to a region occupied by one conductive mesh 26 is supplied to the first means 60. . As a method for supplying such a sheet-like pressure-sensitive adhesive body 45, a conventionally known method can be employed. As an example, the following supply method can be employed.

  First, an adhesive sheet 45 having an adhesive material layer 44 and a pair of release sheets 43a and 43b laminated on both sides of the adhesive material layer 44 is prepared by, for example, the manufacturing method described above. And the cut 45a which divides the area | region which forms the sheet-like adhesive body 40 is put into the prepared adhesive sheet 45 in one. As shown in FIG. 4, the cut 45a is a so-called half cut, which penetrates one release sheet 43a and the adhesive layer 44 and enters the other release sheet 43b, but penetrates to the other release sheet 43b. It is supposed not to. As shown in FIG. 4, the pressure-sensitive adhesive sheet 45 can be brought into the first means 60 as a wound body wound around the supply core 67. The other release sheet 43b of the pressure-sensitive adhesive sheet 45 fed out from the supply core 67 is folded back at the sharply protruding tip portion 68a of the knife edge 68, whereby the pressure-sensitive adhesive layer 44 is peeled from the release sheet 43b and peeled off from the pressure-sensitive adhesive layer 44. A sheet-like pressure-sensitive adhesive body 45 having the sheet 43a is obtained.

  The sheet-like pressure-sensitive adhesive body 40 thus supplied is fed between the pair of nip rolls 61 and 62 of the first means 60 together with the sheet 20 with the conductive mesh supplied in parallel. At this time, as shown in FIG. 4, the conductive mesh 26 of the sheet 20 with the conductive mesh and the adhesive material layer 44 of the adhesive body 40 face each other. And the sheet | seat 20 with an electroconductive mesh and the adhesive body 40 to be supplied will mutually overlap by passing between the pair of nip rolls 61 and 62 of the 1st means 60. FIG. The separation distance between the pair of nip rolls 61 and 62 at this time is controlled by the control device 55, and the conductive mesh-attached sheet 20 and the adhesive body 40 are subjected to a relatively low pressure (for example, a linear pressure of 10 kg / cm). Pressed toward each other. Moreover, in this Embodiment, the nip rolls 61 and 62 are not specially heated etc. As a result, the sheet | seat 20 with an electroconductive mesh and the adhesive body 40 are processed at normal temperature. In addition, normal temperature means not performing the heat processing or cooling processing performed positively in anticipation of some effect | action of a process target object. The specific temperature is about 0 to 40 ° C., usually about 10 to 30 ° C., although depending on the area, season, and air conditioning management status of the processing equipment.

  In this way, in the temporary sticking step (first step), one sheet-like pressure-sensitive adhesive body 40 faces each one conductive mesh 26 so that a plurality of sheet-like pressure-sensitive adhesive bodies 40 are one conductive. The sheets 20 with the conductive mesh are sequentially stacked. At this time, the sheet 20 with the conductive mesh and the pressure-sensitive adhesive body 40 are processed at room temperature and are pressed only at a relatively low pressure. The leaf-like adhesive body 40 can be positioned with high accuracy. Further, since the positioning can be performed with high accuracy, it is not necessary to press the conductive mesh-attached sheet 20 and the adhesive body 40 with a strong pressure at the time of superposition. It is possible to prevent defects such as wrinkles and warpage from occurring on the body 40.

  Next, a heating and pressurizing step (second step) for heating and pressurizing the laminate 11 of the conductive mesh-attached sheet 20 and the pressure-sensitive adhesive body 40 will be described with reference mainly to FIG. As shown in FIG. 5, the second means 70 of the bonding apparatus 50 includes a metal roll 71 and a rubber roll 72 that are arranged to face each other, and a heating mechanism 73 that is built in the metal roll 71 and heats the surface of the metal roll 71. And have. Further, the second means 70 further includes two guide rolls 74 a and 74 b disposed to face the metal roll 71. As shown in FIG. 5, the guide rolls 74 a and 74 b are respectively disposed on the upstream side and the downstream side of the rubber roll 72 along the movement path of the laminate 11.

  As shown in FIG. 4, the laminate 11 of the conductive mesh-attached sheet 20 and the adhesive body 40 bonded in the temporary bonding step is guided by the guide rollers 74 a and 74 b and is in contact with the surface of the metal roll 71. Move with. At this time, the pressure-sensitive adhesive body 40 in the laminate 11 faces the metal roll 71, and the conductive mesh-attached sheet 20 in the laminate 11 faces the guide rolls 74 a and 74 b and the rubber roll 72.

  As shown in FIG. 5, the heating mechanism 73 of the second means 70 is connected to the control device 55 and its operation is controlled by the control device. During this process, the heating mechanism 73 heats the metal roll 71 so that the surface temperature of the metal roll 71 falls within a desired temperature range. Therefore, the laminate 11 conveyed while being in contact with the metal roll 71 is also heated by the surface of the heated metal roll 71. Then, the laminate 11 passes between the metal roll 71 and the rubber roll 72 while being heated by the metal roll 71, and is pressed between the metal roll 71 and the rubber roll 72. That is, the metal roll 71 is heated by the heating mechanism 73, and in this way, in the second step, the conductive mesh-attached sheet 20 and the pressure-sensitive adhesive body 40 are heated to a temperature higher than the temperature at the time of overlapping in the first step. Pressurized. As a heating mechanism, the inside of the metal roll 71 is made hollow and a high-temperature fluid such as hot water or heated steam is circulated therein, and an AC electromagnetic field is applied to the metal roll and heated using eddy current loss, hysteresis loss, or the like. A method (induction heating) or the like is used.

  In addition, when the present inventors repeated earnest research, when the heating temperature was too high, the laminate 11 was damaged by heat, and when the heating temperature was too low, it was confirmed that bubbles remained in the laminate 11. When the laminate 11 is heated via the metal roll 71 as in the present embodiment, the surface temperature of the metal roll 71 is preferably less than 100 degrees, and more preferably 60 degrees or more and 80 degrees or less.

  As shown in FIG. 5, the separation distance between the metal roll 71 and the rubber roll 72 is controlled by the control device 55. And the control apparatus 55 is the pressure P2 higher than the pressure P1 at the time of superimposing the sheet | seat 20 with an electroconductive mesh and the laminated body 11 of the adhesive body 40 which were mutually piled up by the nip rolls 61 and 62 of the 1st means 60, The separation distance between the metal roll 71 and the rubber roll 72 is controlled so as to apply pressure between the metal roll 71 and the rubber roll 72. As a result of repeated experiments by the present inventors, it has been found that the laminate 11 is preferably pressed between the metal roll 71 and the rubber roll 72 at a linear pressure of 65 kg / cm to 130.

  In this heating and pressing step, a low-rigidity rubber roll 72 is brought into contact with one side of the laminate 11. Therefore, even if the laminate 11 is pressed at a relatively high pressure between the metal roll 71 and the rubber roll 72, the laminate 11 is not damaged. In particular, according to the present embodiment, the conductive mesh-attached sheet 20 (particularly the base material 24 side) is located on the rubber roll 72 side, and the pressure-sensitive adhesive body 40 is located on the metal roll 71 side. According to such an aspect, the inventors of the present invention have repeated research. In the heating and pressurizing step, warpage, distortion, and the like of the laminate sheet for display (display member) due to the fluid flow deformation of the adhesive material layer. Or it was possible to prevent the damage very effectively.

  In this way, in the heating and pressurizing step (second step), the laminate 10 of the conductive mesh-attached sheet 20 and the adhesive body 40 that are superposed on each other is disposed between the metal roll 71 and the rubber roll 72 that are arranged to face each other. In between, the pressure is higher than the temperature at the time of superimposing in the temporary pasting step (first step), and the pressure is higher than the pressure at the time of superimposing in the temporary pasting step (first step), The display laminate sheet 10 shown in FIGS. 1 and 2 is formed. As a result of repeated researches by the present inventors, according to such a heating and pressurizing step, mixing of bubbles G between each conductive mesh 26 and the adhesive material layer 44 can be effectively suppressed. Thus, it has been found that it is possible to prevent the occurrence of defects in the display member 12 due to the inclusion of the bubbles G.

  The mechanism for causing such a phenomenon is not necessarily clear, but it is assumed that the following phenomenon occurs. First, the air bubbles G (see FIG. 4) remaining between the respective conductive meshes 26 of the sheet 20 with the conductive mesh and the adhesive material layer 44 of the adhesive body 40 are refined by heat and pressure. At this time, due to the heating from the metal roll 71, the flow of the adhesive layer 44 is increased, and the refinement of the bubbles G is promoted, and further, the refined bubbles G are dissolved in the adhesive layer 44. It becomes easy. Thereby, presence of the bubble G can be made inconspicuous. Further, since the fluidity of the adhesive material layer 44 is high, it is estimated that squeezing out the bubbles G from between the conductive meshes 26 and the adhesive material layer 44 is also promoted. From these results, it is possible to effectively make the bubbles G mixed between each conductive mesh 26 and the adhesive material layer 44 inconspicuous in the temporary pasting step by the heating and pressurizing step performed after the temporary pasting step. Presumed to be possible.

  In this way, a plurality of sheet-like pressure-sensitive adhesive bodies 40 are sequentially bonded to one sheet 20 with a conductive mesh so that each sheet-like pressure-sensitive adhesive body 40 faces one conductive mesh 26. As a result, a web-like laminate sheet for display 10 extending in a strip shape as shown in the plan view of FIG. 2 is manufactured. The manufactured laminate sheet 10 for display may be temporarily wound around a winding core 77 as shown in FIG.

  As described above, according to the present embodiment, the temporary bonding step in which the conductive mesh-attached sheet 20 and the pressure-sensitive adhesive body 40 are overlapped, and the temperature in the temporary bonding step is higher than the pressure in the temporary bonding step. A heating and pressing step of pressing the conductive mesh-attached sheet 20 and the pressure-sensitive adhesive body 40 toward each other by pressure is provided as a separate step.

  Therefore, in the temporary sticking step, the conductive mesh-attached sheet 20 and the adhesive body 40 may be overlapped at a relatively low temperature and a relatively low pressure. For this reason, in the temporary sticking step, the conductive mesh-attached sheet 20 and the pressure-sensitive adhesive body 40 can be positioned and overlapped with each other with high accuracy. In addition, since the positioning can be performed with high accuracy, the conductive mesh-attached sheet 20 and the pressure-sensitive adhesive body 40 are not pressed with a strong pressure at the time of superposition. It is effective that wrinkles and warpage occur in the display laminate sheet 10 formed by bonding and the display member 12 made of a region corresponding to one conductive mesh 26 of the display laminate sheet 10. Can be prevented.

  On the other hand, in the heating and pressing step, the conductive mesh-attached sheet 20 and the pressure-sensitive adhesive body 40 are pressed at a relatively high temperature and a relatively high pressure. Therefore, the bubbles G mixed between the respective conductive meshes 26 of the sheet 20 with the conductive mesh and the adhesive material layer 44 of the adhesive body 40 can be made inconspicuous. That is, the mixing of the bubbles G between the respective conductive meshes 26 and the adhesive material layer 40 is effectively suppressed, and the occurrence of the malfunction of the display member 12 due to the mixing of the bubbles G is prevented. be able to.

  In addition, as described above, a display laminate including a plurality of display members 12 along the longitudinal direction in which mixing of bubbles G between the conductive mesh 26 and the adhesive material layer 40 is effectively suppressed. It is the sheet | seat 10, Comprising: The laminated body sheet | seat 10 for a display extended in strip | belt shape can be manufactured. Accordingly, the autoclave treatment for the display laminate sheet 10 (display member 12) can be omitted, and accordingly, the display laminate sheet 10 is made into a sheet for each display member 12 at this stage. There is no need to cut. As a result, it is possible to greatly reduce the complexity of handling the display member 12 (display laminate sheet 10) thereafter, and to process each display member 12 (display laminate sheet 10) at high speed. High efficiency can be achieved.

  Various modifications can be made to the above-described embodiment.

  In embodiment mentioned above, the metal roll 71 is heated by the heating mechanism 73, and, thereby, in the 2nd process, it is higher than the temperature at the time of the sheet | seat 20 with an electroconductive mesh and the adhesive body 40 being overlaid by a 1st process. Although an example in which pressure is applied by heating to a temperature has been shown, the present invention is not limited to this. For example, the laminate 11 of the conductive mesh-attached sheet 20 and the pressure-sensitive adhesive body 40 is heated by another method, whereby the conductive mesh-attached sheet 20 and the pressure-sensitive adhesive body 40 are overlapped in the first process. The pressure may be increased by heating to a temperature higher than the temperature at the time of heating. For example, before the metal roll 71 and the rubber roll 72 come into contact, the laminate 11 of the conductive mesh-attached sheet 20 and the pressure-sensitive adhesive body 40 may be heated, for example, by blowing hot air.

  Moreover, in the temporary sticking process (1st process) of embodiment mentioned above, the sheet | seat 20 with an electroconductive mesh and the adhesive body 40 are passed between a pair of nip rolls 61 and 62 in a normal temperature state, and are mutually overlaid. An example is shown, but the present invention is not limited to this. For example, the conductive mesh-attached sheet 20 and the pressure-sensitive adhesive body 40 may be overlapped with each other while either the conductive mesh-attached sheet 20 or the pressure-sensitive adhesive body 40 is heated.

  EXAMPLES Hereinafter, although this invention is demonstrated in detail using an Example, this invention is not limited to this Example.

  As described below, display members according to Example 1, Comparative Example 1, and Comparative Example 2 were produced. And about the produced display member, the presence or absence of mixing of a bubble and the presence or absence of the defect on the external appearance of a display member were evaluated.

Example 1
By the above-mentioned bonding method described with reference to FIG. 4 and FIG. 5, a sheet-like pressure-sensitive adhesive body was bonded onto a web-like sheet with a conductive mesh to produce a laminate sheet for display.

  First, the sheet | seat with an electroconductive mesh used what was produced as follows. First, a 10 μm thick copper foil was dry-laminated on a base material made of a biaxially stretchable polyethylene terephthalate (PET) film having a thickness of 100 μm via an adhesive layer of a two-component curable urethane resin. Thereafter, the copper foil is patterned by etching using a photolithography technique, and the conductive mesh in the form of a square lattice having a line width of 1 μm, a period of 300 μm, and a height (thickness) of 10 μm and no peripheral mesh is formed. A frame-shaped grounding portion was formed.

  On the other hand, the pressure-sensitive adhesive body is prepared by preparing a pressure-sensitive adhesive sheet having a pressure-sensitive adhesive layer made of acrylic pressure-sensitive adhesive having a thickness of 25 μm and a release sheet having a thickness of 38 μm laminated on both sides of the pressure-sensitive adhesive material layer. It was obtained by peeling one release sheet from the sheet.

  In the temporary pasting step (first step), the first means of the pasting apparatus described above is used, and the conductive mesh-attached sheet and the pressure-sensitive adhesive body are heated at room temperature (23 ° C.) on the conductive mesh-attached sheet. The pressure-sensitive adhesive layer side of the pressure-sensitive adhesive body was opposed to the conductive mesh side, and the pressure-sensitive adhesive bodies were overlapped to produce a laminate including the sheet with the conductive mesh and the pressure-sensitive adhesive body. The pressure applied to the conductive mesh-attached sheet and the pressure-sensitive adhesive in the temporary sticking step was approximately 10 kg / cm.

  In the heating and pressurizing step, using the second means of the bonding apparatus described above, while heating the metal roll by the heating mechanism so that the surface temperature of the hollow metal roll in which hot water is circulated is approximately 70 degrees. The laminate composed of the sheet with the conductive mesh and the pressure-sensitive adhesive was heated and pressed between the metal roll and the rubber roll formed by coating silicon rubber around the iron core. In the heating and pressurizing step, the pressure applied to the laminate was about 100 kg / cm.

  Under the conditions described above, a display laminate sheet including a plurality of display members was prepared, and the display laminate sheet was cut to obtain a display member.

(Comparative Example 1)
First, the same sheet | seat with an electroconductive mesh and adhesive body as Example 1 were prepared. Next, in the same manner as in Example 1, the pressure-sensitive adhesive body was superposed on the sheet with the conductive mesh to produce a laminate including the sheet with the conductive mesh and the pressure-sensitive adhesive body.

  Thereafter, the obtained laminate was cut for each conductive mesh, and the cut laminate was subjected to autoclave treatment to produce a display member.

  That is, in the method for manufacturing a display member in Comparative Example 1, the heating and pressing step was omitted from the manufacturing method in Example 1, and an autoclave treatment was added instead.

(Comparative Example 2)
First, the same sheet | seat with an electroconductive mesh and adhesive body as Example 1 were prepared. Next, in the same manner as in Example 1, the pressure-sensitive adhesive body was superposed on the sheet with the conductive mesh to produce a laminate including the sheet with the conductive mesh and the pressure-sensitive adhesive body.

  The obtained laminate was cut for each conductive mesh to produce a display member.

  That is, the manufacturing method of the display member in Comparative Example 2 omits the heating and pressing step from the manufacturing method in Example 1.

(Comparative Example 3)
First, the same sheet | seat with an electroconductive mesh and adhesive body as Example 1 were prepared. Next, the sheet | seat with an electroconductive mesh was supplied to the 2nd means of the bonding apparatus mentioned above. In parallel with the supply of the sheet with the conductive mesh to the second means, an adhesive was supplied between the metal roll and the rubber roll of the second means.

  At this time, the metal roll was heated by the heating mechanism so that the surface temperature of the metal roll was 70 degrees. And the adhesive body was bonded on the sheet | seat with an electroconductive mesh, pressurizing the sheet | seat with an electroconductive mesh, and an adhesive body at about 100 kg / cm between the heated metal roll and the rubber roll. Under the conditions described above, a display laminate sheet including a plurality of display members was prepared, and the display laminate sheet was cut to obtain a display member.

  That is, in the method for manufacturing a display member in Comparative Example 3, the temporary pasting step and the heating and pressing step in the manufacturing method in Example 1 were performed simultaneously.

(Evaluation test)
About each display member obtained as described above, it was confirmed whether or not bubbles were mixed between the electromagnetic wave shielding sheet and the pressure-sensitive adhesive layer using a 50-fold magnifier. The results are shown in Table 1. In Table 1, “x” is entered in the “bubble inspection” column for the display member in which the presence of bubbles is confirmed, and “bubble inspection” is displayed for the display member in which the presence of bubbles is not confirmed. “○” was entered in the column.

Each display member was visually checked for defects such as wrinkles, warpage, and scratches. The results are shown in Table 1. In Table 1, “x” is entered in the column of “visual inspection” for the display member for which defects were visually confirmed, and “visual inspection” for the display member for which defects were not visually confirmed. “○” was entered in the column.

FIG. 1 is a cross-sectional view showing an example of a laminated sheet for display (display member) that can be obtained by an embodiment of the present invention. FIG. 2 is a plan view showing the display laminate sheet (display member) shown in FIG. 1. FIG. 3 is a plan view showing an example of a sheet with a conductive mesh that can be used for manufacturing the laminate sheet for display shown in FIG. FIG. 4 is a diagram for explaining an embodiment according to the present invention, and is a diagram illustrating a process of superposing a sheet with a conductive mesh and an adhesive body. FIG. 5 is a diagram for explaining an embodiment according to the present invention, and is a diagram illustrating a process of pressurizing the sheets with the conductive mesh and the pressure-sensitive adhesive body.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Display laminated sheet 12 Display member 20 Sheet | seat with electroconductive mesh 22 Electromagnetic wave shielding sheet 24, 25 Base material 24a, 25a One surface 26 Conductive mesh 40 Adhesive body 42 Sheet material 44 Adhesive material layer 50 Bonding apparatus 55 Control device 60 Means 61, 62 Roll 70 Means 71 Metal roll 72 Rubber roll 73 Heating mechanism

Claims (7)

A base material having a longitudinal direction and extending in a strip shape, and a sheet with a conductive mesh including a plurality of conductive meshes arranged along the longitudinal direction of the base material on one surface of the base material, A pressure-sensitive adhesive layer including a pressure-sensitive adhesive layer laminated on a sheet material,
A first step in which the conductive mesh of the sheet with the conductive mesh and the adhesive material layer of the adhesive body face each other, and the sheet with the conductive mesh and the adhesive body are overlapped,
The step performed after the first step, wherein the sheet with the conductive mesh and the pressure-sensitive adhesive body, which are superposed on each other, are overlapped in the first step between a metal roll and a rubber roll arranged to face each other. And a second step of pressurizing at a temperature higher than the temperature at the time of combining and a pressure higher than the pressure at the time of overlapping in the first step. In the second step, the metal roll is heated by a heating mechanism, whereby in the second step, the conductive mesh-attached sheet and the pressure-sensitive adhesive body are higher in temperature than in the first step. The bonding method according to claim 1, wherein the method is heated and pressurized. 3. The bonding method according to claim 2, wherein in the first step, the sheet with conductive mesh and the pressure-sensitive adhesive body are passed between a pair of rolls in a normal temperature state and overlapped with each other. In the said 2nd process, the said sheet | seat with an electroconductive mesh is located in the said rubber roll side, and the said adhesion body is located in the said metal roll side, The sticking as described in any one of Claim 1 thru | or 3 characterized by the above-mentioned. How to do it. The said sheet | seat material is a peeling sheet which has peelability with respect to the said adhesive material layer, The bonding method as described in any one of Claim 1 thru | or 4 characterized by the above-mentioned. In the first step, a plurality of sheet-like pressure-sensitive adhesive bodies are sequentially superposed on one sheet with the conductive mesh so that one sheet-like pressure-sensitive adhesive body faces one conductive mesh. The pasting method according to any one of claims 1 to 5 characterized by things. A base material having a longitudinal direction and extending in a strip shape, and a sheet with a conductive mesh including a plurality of conductive meshes arranged along the longitudinal direction of the base material on one surface of the base material, A pressure-sensitive adhesive layer including a pressure-sensitive adhesive layer laminated on a sheet material, and a method of manufacturing a display laminate sheet,
A first step in which the conductive mesh of the sheet with the conductive mesh and the adhesive material layer of the adhesive body face each other, and the sheet with the conductive mesh and the adhesive body are overlapped,
The step performed after the first step, wherein the sheet with the conductive mesh and the pressure-sensitive adhesive body, which are superposed on each other, are overlapped in the first step between a metal roll and a rubber roll arranged to face each other. And a second step of pressurizing at a temperature higher than the temperature at the time of combining and a pressure higher than the pressure at the time of overlapping in the first step.

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