JP2013038791A - Disassembly structure and non-electric apparatus having the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to easily disassemble a connection portion of adherends connected to each other.SOLUTION: In a disassembly structure, a double-sided adhesive tape 17 in which thermal-foaming-agent-containing adhesive agent layers 22 and 23 are formed on both surfaces of a base material 21, and a planar heat-generating body 16 which abuts against the double-sided adhesive tape 17, are interposed in a laminated state into a connection portion of a housing 2 formed by connecting a front cover 2A and a rear cover 2B, and a thermal foaming agent contained in the thermal-foaming-agent-containing adhesive agent layers 22 and 23 is heated, expanded and foamed, by supplying power to the planar heat-generating body 16 to allow the planar heat-generating body 16 to generate heat. The foaming processing allows the thermal-foaming-agent-containing adhesive agent layers 22 and 23 to be expanded and deformed, to form unevenness in an adhesive interface between the adhesive agent layer and both covers 2A and 2B, to eliminate adhesive power of the adhesive agent layers 22 and 23.

Description

  The present invention has a dismantling structure and a disassembling structure for easily disassembling a fastening portion of a non-electrical device including a liquid crystal display device, various television receivers, an electric device such as a refrigerator, and a sealing package such as toner of a printer. It relates to non-electric equipment.

  In recent years, the demand for reuse of recycled resources has been increasing, and articles manufactured in various fields including electrical equipment and non-electric equipment are disassembled and collected separately for each constituent material.

  For example, a cathode ray tube television receiver, a liquid crystal display device, a liquid crystal television receiver, a plasma television receiver, and the like include a casing formed by fastening a front cover and a rear cover that constitute an exterior, and a display portion. A cathode ray tube, a display panel, a power source, a control circuit, and the like are fastened with a plurality of screws at appropriate positions (see Patent Document 1).

FIG. 1 of Japanese Patent Application Laid-Open No. 2006-304079

  However, in the conventional fastening structure, an operator has to release the fastening by using a screwdriver one by one with respect to the equipment to be discarded and collected, and there is a disadvantage that the disassembling work is complicated. Has occurred.

  The present invention has been made in view of such circumstances, and a main object thereof is to provide a disassembly structure and a non-electric device having a disassembly structure that can easily disassemble the adherends that have been fastened. To do.

The first invention is a double-sided pressure-sensitive adhesive tape or double-sided pressure-sensitive adhesive sheet in which a thermal foaming agent-containing pressure-sensitive adhesive layer is formed on at least one surface of a substrate,
A heating element that heats and foams the thermal foaming agent-containing pressure-sensitive adhesive layer,
The adhesive tape or sheet, and a pair of adherends fastened via a heating element,
The heating element is composed of metal powder contained in at least one of the pressure-sensitive adhesive layers formed on the front and back surfaces of the substrate.

  (Function / Effect) According to this structure, between the adherends fastened by the double-sided pressure-sensitive adhesive tape or the double-sided pressure-sensitive adhesive sheet, by heating the double-sided pressure-sensitive adhesive tape or the like with a heating element or the like, The contained thermal foaming agent is thermally expanded and foamed. The pressure-sensitive adhesive layer expands and deforms due to foaming of the thermal foaming agent and unevenness is generated at the contact interface with the adherend, the adhesive force is lost, and the fastened adherends can be easily decomposed. .

  In particular, in the above structure, the heating element is composed of metal powder contained in an adhesive layer such as a double-sided adhesive tape.

  Therefore, the thermal foaming-containing pressure-sensitive adhesive layer may be induction-heated by electromagnetic induction by bringing a magnetic head provided with an electromagnetic coil close to the heating element.

The second invention is a non-electrical device having a dismantling structure at a fastening portion between adherends,
A double-sided pressure-sensitive adhesive tape or double-sided pressure-sensitive adhesive sheet in which a thermal foaming agent-containing pressure-sensitive adhesive layer is formed on at least one surface of the substrate;
It is characterized in that a heating element composed of metal powder contained in at least one of the pressure-sensitive adhesive layers formed on the front and back surfaces of the base material is provided between adherends that fasten each other.

  (Operation / Effect) According to the non-electric device having this structure, the metal powder contained in the adhesive layer is induction-heated by bringing the magnetic head provided with the electromagnetic coil close to the fastening portion of the adherend. The With the induction heating, the thermal foaming agent contained in the pressure-sensitive adhesive layer is heated to expand and fire, and the pressure-sensitive adhesive force of the pressure-sensitive adhesive layer is lost. Therefore, the adherends fastened by the double-sided pressure-sensitive adhesive tape or double-sided pressure-sensitive adhesive sheet can be easily disassembled.

  As described above, according to the disassembled structure and the non-electrical device having the disassembled structure of the present invention, the adherends are fastened with the double-sided pressure-sensitive adhesive tape or double-sided pressure-sensitive adhesive sheet having a thermal foaming agent-containing pressure-sensitive adhesive layer and a heating element interposed therebetween. If the pressure-sensitive adhesive layer is heated with a heating element, the thermal foaming agent expands and foams and the adhesive strength of the pressure-sensitive adhesive layer is lost, so that the fastened adherends can be easily disassembled. be able to.

It is a front exploded perspective view of a liquid crystal television receiver. It is a back surface perspective view of a liquid crystal television receiver. It is AA arrow sectional drawing of the front cover part shown in FIG. It is a block diagram which shows a decomposition | disassembly structure. It is a flowchart which shows the decomposition | disassembly process of a liquid crystal television receiver. It is sectional drawing which shows the structure of the double-sided adhesive tape of another Example.

  Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 is an exploded perspective view showing a structure of a liquid crystal television device which is an electric device.

  The liquid crystal television receiver 1 drives and controls a housing 2 composed of a front cover 2A and a rear cover 2B, a liquid crystal display device 3, a speaker unit 4, the liquid crystal display device 3, and the speaker unit 4 housed in the housing 2. The board 5 includes a control circuit and a power supply circuit, and a stand 6 provided on the lower surface of the housing 2 and placed on the placement surface.

  The front cover 2A has a rectangular shape, and a panel opening 8 that exposes the liquid crystal panel 7 is formed inside thereof. A front panel 9 surrounding the liquid crystal panel 7 is provided around the panel opening 8. A mounting portion for the speaker unit 4 is provided inside the lower portion of the front cover 2A, and a main slit 10 is formed on the facing surface of the speaker. Further, a guide 11 for positioning the rear cover 2B is provided upright at the rear corner of the front cover 2A.

  The rear cover 2B is a rectangular box, and is configured to be fastened to the front cover 2A while being fastened to the front cover 2A and storing the tops of the liquid crystal display device 3, the speaker unit 4, the substrate 5, and the stand 6. ing. Further, a guide hole 12 into which the guide 11 of the front cover 2A is fitted is formed at a corner portion of the rear cover 2B.

  As shown in FIG. 2, the liquid crystal display device 3 includes a liquid crystal panel 7 and a chassis 13 including a backlight unit that surrounds the liquid crystal panel 7. A metallic back chassis 14 is fastened to the back surface of the liquid crystal display device 3, and the stand 6 is fixed to the back chassis 14 with screws. Further, the substrate 5 is fastened to the back surface of the back chassis 14.

  Next, the fastening structure of the front cover 2A and the rear cover 2B will be described. FIG. 3 is a cross-sectional view showing a state in which both covers 2A and 2B are fastened.

  A rectangular step portion 15 is formed along the fastening surface of the front cover 2A. It has a laminated structure in which the planar heating element 16 and the double-sided adhesive tape 17 are attached in this order from the bottom surface of the step portion 15.

  The height from the bottom surface of the step portion 15 to the convex portion 18 outside the step portion is set to be slightly lower than the surface height when the planar heating element 16 and the double-sided pressure-sensitive adhesive tape 17 are laminated. That is, when both covers 2A and 2B are pressed and fastened to the double-sided pressure-sensitive adhesive tape 17, the double-sided pressure-sensitive adhesive tape 17 is elastically deformed so as to have the same height as the height of the step portion 15. Therefore, the cover 2A and 2B are configured such that no gap is generated between the joint surfaces.

  The planar heating element 16 is obtained by bonding a meandering metal foil 19 such as aluminum to an adhesive layer applied to a base film such as PET, and further bonding a cover film on the surface thereof. A thermosetting pressure-sensitive adhesive layer 20 is formed on the back surface of the base film, and is configured to be fastened to the front cover 2A.

  Further, as shown in FIG. 4, the planar heating element 16 is connected to the substrate 5 including the power supply circuit 26 via the controller 24 so as to be energized.

  The double-sided pressure-sensitive adhesive tape 17 is, for example, a heat-foaming type removable acrylic pressure-sensitive adhesive tape, and thermal foaming agent-containing pressure-sensitive adhesive layers 22 and 23 that thermally foam at different temperatures are formed on the front and back surfaces of the substrate 21. In the case of this example, the foaming temperature of the thermal foaming agent contained in the thermal foaming agent-containing pressure-sensitive adhesive layer 22 in close contact with the planar heating element 16 is the foaming temperature of the thermal foaming agent in the thermal foaming agent-containing pressure-sensitive adhesive layer 23. Higher than

  The thermal foaming agent-containing pressure-sensitive adhesive layers 22 and 23 are not particularly limited as long as they are layers made of an acrylic pressure-sensitive adhesive containing a thermal foaming agent. For example, an acrylic polymer is contained as the base polymer.

  Next, disassembly of the liquid crystal television receiver 1 will be described with reference to a flowchart shown in FIG.

  As shown in FIG. 4, an operation device 25 dedicated to disassembly is connected to the liquid crystal television receiver 1 and power is supplied. The operator selects the dismantling object from the operating device 25 and sets it, whereby the foaming temperature of the thermal foaming agent of the double-sided pressure-sensitive adhesive tape 17 used for fastening the front and rear covers 2A, 2B and the time until foaming is completed. Is extracted from the database of the operation device 25 stored in advance (step S1).

  When the extracted data is transmitted from the operation device 25 to the controller 24 in the liquid crystal television receiver 1, the controller 24 controls the operation of the power supply circuit of the substrate 5 and starts supplying power to the planar heating element 16 (step S2). .

  Along with the start of power supply to the planar heating element 16, a sensor for detecting the temperature of the planar heating element 16 is activated to detect the temperature in real time and transmit it to the controller 24. The controller 24 performs feedback control so as to maintain the predetermined temperature by operating the power supply circuit based on the received temperature information. At this time, heating of the thermal foaming agent-containing pressure-sensitive adhesive layer 23 on the low-temperature foaming side is started.

  At the same time, the controller 24 counts the timer until the end of the heating time set in advance for the adhesive layer 23 on the low temperature foaming side (step S3). In the heating process, the thermal foaming agent in the thermal foaming agent-containing pressure-sensitive adhesive layer 23 expands and foams and the thermal foaming agent-containing pressure-sensitive adhesive layer 23 expands and deforms, so that both fastening interfaces with the rear cover 2B are uneven. It will be transformed. When the heating end point is reached, the adhesive force of the thermal foaming agent-containing pressure-sensitive adhesive layer 23 on the fastening surface is lost, so that the rear cover 2B can be separated and disassembled from the thermal foaming agent-containing pressure-sensitive adhesive layer 23 become.

  Subsequently, the controller 24 operates the power supply circuit so that the heating temperature according to the thermal foaming agent-containing pressure-sensitive adhesive layer 22 on the high-temperature foaming side is reached, and counts the timer until the end of the preset heating time (step) S4). In the heating process, similarly to the thermal foaming agent-containing pressure-sensitive adhesive layer 22, expansion and foaming of the thermal foaming agent occur, and the thermal foaming agent-containing pressure-sensitive adhesive layer 22 expands and deforms. Therefore, the double-sided adhesive tape 17 can be separated from the front cover 2A.

  When the heating time of the thermal foaming agent-containing pressure-sensitive adhesive layer 22 has elapsed, the controller 24 ends the power supply to the planar heating element 16. In this state, the operator stops the power supply of the liquid crystal television receiver 1 and also disconnects the operation device 25 and separates the front and rear covers 2A and 2B (step S5).

  The separation and disassembly of the front cover 2A and the rear cover 2B of the liquid crystal television receiver 1 is thus completed.

  As described above, the double-sided pressure-sensitive adhesive tape 17 having the thermal foaming agent-containing pressure-sensitive adhesive layers 22 and 23 between the front cover 2A and the rear cover 2B, which are adherends, and the surface that directly contacts the double-sided pressure-sensitive adhesive tape 17 By having a structure in which the heating element 16 is fastened, the adhesive force of the double-sided adhesive tape 17 can be lost only by heating the planar heating element 16. The covers 2A and 2B can be easily disassembled.

  The present invention is not limited to the embodiment described above, and can be modified as follows.

  (1) In the above-described embodiment, the description has been given by taking as an example an apparatus provided with a power source in a casing which is an adherend. However, in the case of electrical equipment and non-electric equipment that do not include a power source, the following configuration is provided. do it. For example, the equipment body is equipped with an external connection terminal for power supply, and power is supplied to the sheet heating element interposed between the governor member and the constituent members using the power source connected to the external connection terminal. And what is necessary is just to comprise so that a thermal foaming agent containing adhesive layer may be heated. In this configuration, power may be supplied to the device main body via the operating device, and the heating temperature and heating time may be controlled by the operating device.

  As another embodiment, the configuration of the sheet heating element 16 may be provided on the base material 21 or the pressure-sensitive adhesive layers 22 and 23 of the double-sided pressure-sensitive adhesive tape 17. In the case of this configuration, the base material 27 that functions as a planar heating element is not particularly limited as long as it has a characteristic of generating heat when energized. For example, as shown in FIG. ), Heating wire [for example, nichrome wire (nickel-chromium alloy metal wire)], iron-chromium alloy metal wire, etc., with meandering wiring in resin film 29, metal foil as resin Examples thereof include a conductive resin in which conductive particles such as conductive wires such as conductive carbon are kneaded into a resin.

  In the case of this configuration, the heat is not supplied directly to the heating element, but the magnetic head having an electromagnetic coil is brought close to the fastening portion between the adherends, and the heating element is heated non-contactly and electromagnetically by electromagnetic induction. The thermal foaming agent of the foaming agent-containing pressure-sensitive adhesive layers 22 and 23 is expanded or foamed to lose the adhesive strength of the pressure-sensitive adhesive layer. Therefore, also in the said structure, to-be-adhered bodies can be easily disassembled like the said Example.

  (2) In the above-described embodiment, the liquid crystal television receiver has been described as an example. However, the present invention is not limited to the device, and is not limited to the device. The disassembly structure and the disassembly method can be suitably applied to any non-electric equipment that is a product.

  (3) In the above embodiments, the double-sided pressure-sensitive adhesive tape 17 has been described as an example, but a double-sided pressure-sensitive adhesive sheet may be used. By using the double-sided pressure-sensitive adhesive sheet, the present invention can be applied not only to a place where the fastening area is small like the front and rear covers 2A and 2B but also to a place where the contact area is wide like the liquid crystal panel 7 and the back chassis. Therefore, by properly using the double-sided pressure-sensitive adhesive tape and the double-sided pressure-sensitive adhesive sheet under the conditions of the fastening part, the disassembly structure of the present invention can be suitably applied to any part having a fastening structure.

DESCRIPTION OF SYMBOLS 1 ... Liquid crystal television receiver 2 ... Housing | casing 2A ... Front cover 2B ... Rear cover 15 ... Step part 16 ... Planar heating element 17 ... Double-sided adhesive tape 22, 23 ... Thermal foaming agent containing adhesive layer

Claims (2)

A double-sided pressure-sensitive adhesive tape or double-sided pressure-sensitive adhesive sheet in which a thermal foaming agent-containing pressure-sensitive adhesive layer is formed on at least one surface of the substrate;
A heating element that heats and foams the thermal foaming agent-containing pressure-sensitive adhesive layer,
The adhesive tape or sheet, and a pair of adherends fastened via a heating element,
The dismantling structure characterized in that the heating element is composed of metal powder contained in at least one of the pressure-sensitive adhesive layers formed on the front and back surfaces of the substrate. A non-electrical device having a dismantling structure at the fastening part between adherends,
A double-sided pressure-sensitive adhesive tape or double-sided pressure-sensitive adhesive sheet in which a thermal foaming agent-containing pressure-sensitive adhesive layer is formed on at least one surface of the substrate;
A non-electrical device comprising: a heating element constituted by metal powder contained in at least one of the pressure-sensitive adhesive layers formed on the front and back surfaces of the base material, between adherends that fasten each other.

Images