JP2018047660A - Transfer method and transfer device for heat conductive sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method capable of excellently transferring a heat conductive sheet from a laminate having the heat conductive sheet and a protective film to an adherend.SOLUTION: The present invention relates to a transfer method for a heat conductive sheet that transfers a laminate having the heat conductive sheet and a protective film to an adherend, the transfer method for the heat conductive sheet including a process (A) of sticking the heat conductive sheet of the laminate, having the heat conductive sheet and the protective film positioned on one thickness-directional side of the heat conductive sheet, on the adherend, and a process (B) of peeling the protective film from the heat conductive sheet of the laminate stuck on the adherend, and the process (B) comprising peeling the protective film while applying pressure from the one end side to the other end side of the heat conductive sheet and also to the other end side of a peeling position using a pressing tool.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a transfer method and transfer apparatus for a heat conductive sheet, and in particular, a transfer method that can be suitably used when transferring a heat conductive sheet from a laminate having a heat conductive sheet and a protective film to an adherend. And a transfer device.

  Conventionally, in an electronic device using an electronic component such as a plasma display panel (PDP) or an integrated circuit (IC) chip, a heat sink made of a metal to a heating element such as the electronic component as a countermeasure against a functional failure due to a temperature rise of the electronic component. A method of promoting heat radiation by attaching a heat radiator such as a heat radiating plate or a heat radiating fin is employed. In addition, when using a radiator, in order to efficiently transfer heat from the heating element to the radiator, the heating element and the heating element are connected via a sheet-like member (thermal conduction sheet) that exhibits good thermal conductivity. The radiator is in close contact.

  Here, as the heat conductive sheet, an adhesive sheet formed using a composite material obtained by mixing a resin and a component having heat conductivity is used. And the heat conductive sheet which has adhesiveness is normally stored and transported in a state where the protective film is bonded to both surfaces (adhesive surface), and when it is applied to an adherend such as a heating element or a radiator. Using a technique such as transfer, it is stuck in a state of being in close contact with the adherend.

  Conventionally, the transfer of the sheet from the laminate of the adhesive sheet and the protective film to the adherend, for example, after peeling off the protective film on the side to be attached to the adherend, The laminate with the protective film (unpeeled) is placed on the adherend so that the sheet side faces down, and the laminate and the adherend are pressed by pressing the laminate from the protective film side with a pressing mechanism such as a roller. Is carried out by finally removing the pressing mechanism and then pulling the protective film obliquely upward to peel it off (see, for example, Patent Document 1).

Japanese Patent Laid-Open No. 2006-4091

  However, in the above conventional transfer method, when the heat conductive sheet is transferred from the laminate having the heat conductive sheet and the protective film to the adherend, the heat conductive sheet is torn, and the heat conductive sheet is transferred well. There was a case that could not be done. In particular, in recent years, there has been a demand for improvement and thinning of the adhesiveness of the heat conductive sheet. Therefore, the problem of tearing of the heat conductive sheet at the time of transfer is particularly likely to occur with a highly adhesive heat conductive sheet or a thin heat conductive sheet. It was.

  Then, an object of this invention is to provide the method and apparatus which can transfer a heat conductive sheet to a to-be-adhered body favorably from the laminated body which has a heat conductive sheet and a protective film.

  An object of the present invention is to advantageously solve the above-described problems, and a method for transferring a heat conductive sheet according to the present invention is to attach the heat conductive sheet from a laminate having a heat conductive sheet and a protective film. A method for transferring a heat conductive sheet to be transferred to a body, wherein the heat conductive sheet and a heat conductive sheet of a laminate having a protective film located on one side in the thickness direction of the heat conductive sheet are attached to an adherend. Including the step (A) of bonding, and the step (B) of peeling off the protective film from the heat conductive sheet of the laminate bonded to the adherend. In the step (B), The protective film is peeled off from one end side toward the other end side while applying pressure to the other end side of the peeling position using a pressing jig. Thus, if the pressure is applied to the other end side of the peeling position when peeling the protective film from one end side to the other end side of the heat conductive sheet, the heat conductive sheet is suppressed from being broken, Good transfer to the adherend is possible.

  Here, in the transfer method of the heat conductive sheet of the present invention, in the step (B), an angle formed between the peel surface of the protective film and the surface of the heat conductive sheet from which the protective film is peeled is 45 ° or more. It is preferable to peel off the protective film so that If the angle formed between the peel surface of the protective film and the surface of the heat conductive sheet from which the protective film is peeled (hereinafter sometimes referred to as “peel angle”) is 45 ° or more, the heat conductive sheet. This is because the toner can be transferred onto the adherend more satisfactorily.

  In the method for transferring a heat conductive sheet according to the present invention, in the step (B), it is preferable to apply pressure to the other end side of the peeling position by applying an external force and pressing the pressing jig against the laminate. . If an external force is applied to the holding jig and pressure is applied to the other end of the peeling position, the heat conductive sheet is attached compared to the case where pressure is applied to the other end of the peeling position using only the weight of the holding jig. This is because it can be transferred to the body even better.

  And in the method for transferring a heat conductive sheet of the present invention, the step (A) applies a pressure to the laminate using a step of placing the laminate on the adherend and a holding jig, Including the step of bringing the thermal conductive sheet of the laminate placed on the adherend and the adherend into close contact, and the same pressing jig is used in the step (A) and the step (B). In the step (A), pressure is applied while moving the pressing jig from the other end side to the one end side of the heat conductive sheet. In the step (B), one end side of the heat conductive sheet is used. It is preferable to apply pressure while moving the holding jig from the side toward the other end. This is because if the heat conductive sheet and the adherend are brought into close contact with each other using the pressing jig in the step (A), the heat conductive sheet can be transferred to the adherend more satisfactorily. Moreover, while using the same pressing jig in the step (A) and the step (B), in the step (A), the pressing jig is moved from the other end side to the one end side of the heat conductive sheet, and the process ( In B), if the holding jig is moved from one end side to the other end side of the heat conductive sheet, the heat conductive sheet can be transferred to the adherend by a simple operation.

  Moreover, this invention aims at solving the said subject advantageously, and the transfer apparatus of the heat conductive sheet of this invention uses the said heat conductive sheet from the laminated body which has a heat conductive sheet and a protective film. A heat transfer sheet transfer device used when transferring to an adherend, a pressing jig having a pressing surface for applying pressure to the laminate and a gripping part protruding on the opposite side to the pressing surface side; A guide portion that guides the pressing jig, and a fixing portion that is provided on one side in the extending direction of the guide portion and fixes one end of the laminated body to the adherend. It is characterized by. If a transfer device including such a holding jig, a guide part, and a fixing part is used, heat is generated while moving the holding jig along the guide part in a state where one end of the laminate is fixed by the fixing part. The protective film can be peeled from the conductive sheet. Therefore, if the transfer device having the above-described configuration is used, the heat conductive sheet can be satisfactorily transferred to the adherend using the above-described heat conductive sheet transfer method.

  Here, in the transfer device for a heat conductive sheet of the present invention, it is preferable that the fixing portion has a positioning mechanism for the laminated body on a side in contact with the adherend. This is because if the positioning mechanism is provided on the fixed portion on the side in contact with the adherend, the heat conductive sheet can be easily transferred to a desired position on the adherend.

  And it is preferable that the said positioning mechanism has the groove | channel formed in the side which contacts the said to-be-adhered body of the said fixing | fixed part, and the adhesion member provided in the said groove | channel. This is because if a positioning mechanism having a groove and an adhesive member is used, the heat conductive sheet can be easily transferred to a desired position of the adherend using a simple configuration.

  Moreover, it is preferable that the transfer apparatus of the heat conductive sheet of this invention has the peeling angle control surface which controls the angle at the time of the said pressing jig peeling the said protective film from the said laminated body. This is because the protective film can be easily peeled at a desired peeling angle without providing a member for regulating the peeling angle if the holding jig is provided with a peeling angle regulating surface.

  The transfer device for a heat conductive sheet of the present invention further includes a frame body portion that rotatably supports the guide portion and the fixed portion between a transfer position and a retracted position, and the guide portion and the fixed portion. Is preferably supported by the frame body part via a rotating shaft provided in the fixed part. If a frame body portion that supports the guide portion and the fixing portion so as to be rotatable between the transfer position and the retracted position is provided, the laminate can be easily bonded to the adherend. Therefore, it is possible to improve the work efficiency of the transfer operation of the heat conductive sheet.

  ADVANTAGE OF THE INVENTION According to this invention, a heat conductive sheet can be favorably transcribe | transferred to a to-be-adhered body from the laminated body which has a heat conductive sheet and a protective film.

(A)-(e) is explanatory drawing which shows a mode that a heat conductive sheet is transcribe | transferred to a to-be-adhered body using an example of the transfer method of the heat conductive sheet of this invention. It is a figure which shows schematic structure of an example of a pressing jig, (a) is a front view, (b) is a side view. (A)-(c) is a side view which shows schematic structure of the modification of a pressing jig. It is a perspective view which shows schematic structure of an example of the transfer apparatus of the heat conductive sheet of this invention, (a) shows the state which has a guide part and a fixing | fixed part in a transfer position, (b) has retracted | retracted a guide part and a fixing | fixed part. Indicates the state in position. It is a figure which shows schematic structure of the guide part and fixing | fixed part of the transfer apparatus shown in FIG. 4, (a) is a top view, (b) is a side view, (c) is a bottom view. (A)-(e) is explanatory drawing which shows a mode that a heat conductive sheet is transcribe | transferred to a to-be-adhered body using the transfer apparatus shown in FIG.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In each figure, the same reference numerals have the same configuration.

  Here, the transfer method of the heat conductive sheet of this invention can be used when transferring a heat conductive sheet to a to-be-adhered body from the laminated body which has a heat conductive sheet and a protective film. And the transfer of the heat conductive sheet using the transfer method of the heat conductive sheet of this invention can be suitably implemented, for example using the transfer apparatus of the heat conductive sheet of this invention.

(Heat conduction sheet)
In addition, as a heat conductive sheet transcribe | transferred using the transfer method and transfer apparatus of this invention, the sheet | seat which has heat conductivity and adhesiveness is mentioned, without being specifically limited.
Specifically, examples of the heat conductive sheet include a heat conductive sheet made of a composite material including a resin and a heat conductive filler. And as resin, it does not specifically limit, For example, a fluororesin, an acrylic resin, a silicone resin etc. are mentioned. Further, the heat conductive filler is not particularly limited, and particulate carbon materials such as artificial graphite, flaky graphite, exfoliated graphite, natural graphite, acid-treated graphite, expandable graphite, and expanded graphite, and And fibrous carbon nanostructures such as carbon nanotubes.

Among them, as the heat conductive sheet transferred using the transfer method or transfer apparatus of the present invention, a composite material is pressed into a sheet shape to obtain a composite material sheet, and a plurality of composite material sheets are arranged in the thickness direction. Laminating one sheet or folding or winding a composite material sheet to obtain a laminated body, and slicing the laminated body at an angle of 45 ° or less with respect to the laminating direction to obtain a heat conductive sheet; The heat conductive sheet obtained through this is preferable. The heat conductive sheet manufactured through the above-described steps has a configuration in which slice pieces of the composite material sheet constituting the laminate are joined in parallel, and the heat conductive filler is oriented in the thickness direction. Therefore, it has excellent thermal conductivity in the thickness direction. On the other hand, since the heat conductive sheet manufactured through the above-described steps is formed by joining slice pieces of a composite material sheet in parallel, the tensile strength is lower than that obtained by simply pressing the composite material into a sheet shape. As a result, handling properties are lowered and problems such as sheet tearing are likely to occur. However, if the transfer method or transfer apparatus of the present invention is used, it is possible to suppress the heat conductive sheet from being broken and to transfer the heat conductive sheet to the adherend satisfactorily.
Here, from the viewpoint of reducing thermal resistance, the thickness of the heat conductive sheet is preferably 1000 μm or less, and more preferably 500 μm or less. On the other hand, if the thickness is too thin, the tensile strength of the heat conductive sheet is lowered, and problems such as sheet tearing tend to occur. Therefore, the thickness of the heat conductive sheet is preferably 50 μm or more, and preferably 100 μm or more. More preferred.
Further, the heat conductive sheet preferably has an adhesive strength measured using a probe tack tester of 0.7 N or more, more preferably 1.0 N or more, and further preferably 1.5 N or more. Preferably, it is 2.0 N or more, particularly preferably 10 N or less, more preferably 8.0 N or less, and still more preferably 4.0 N or less. In the case of a heat conductive sheet having an adhesive strength of the above lower limit or more, problems such as tearing are particularly likely to occur during transfer, but if the transfer method or transfer device of the present invention is used, the heat conductive sheet may be torn. This is because the heat conduction sheet can be satisfactorily transferred to the adherend (that is, the effect of suppressing breakage of the heat conduction sheet can be obtained remarkably). Moreover, if adhesive force is below the said upper limit, it is because a heat conductive sheet can be transcribe | transferred more favorably. In addition, the measurement of the adhesive force using a probe tack tester can be performed using the method as described in the Example of this specification.
Furthermore, the heat conductive sheet preferably has a tensile strength of 0.1 MPa or more, more preferably 0.2 MPa or more, further preferably 0.4 MPa or more, and 6.0 MPa or less. Is preferably 4.0 MPa or less, more preferably 3.0 MPa or less, and particularly preferably 2.0 MPa or less. In a heat conductive sheet having a tensile strength of not more than the above upper limit, problems such as tearing are particularly likely to occur during transfer, but if the transfer method or transfer device of the present invention is used, the heat conductive sheet may be torn. This is because the heat conduction sheet can be satisfactorily transferred to the adherend (that is, the effect of suppressing breakage of the heat conduction sheet can be obtained remarkably). Moreover, it is because a heat conductive sheet can be transcribe | transferred more favorably if tensile strength is more than the said lower limit. In addition, the tensile strength of a heat conductive sheet can be measured using the measuring method as described in the Example of this specification.

(Protective film)
Moreover, as a protective film of a heat conductive sheet, paper, a metal film, a plastic film etc. can be used, without being specifically limited. Among these, a polyethylene terephthalate film is preferably used from the viewpoint of cost and workability.
In addition, the surface of a plastic film or the like used as a protective film may be subjected to a release treatment or an adhesive treatment as necessary, or may be subjected to a blast treatment to give an uneven structure.

(Laminate)
Furthermore, as a laminated body which has a heat conductive sheet and a protective film, the laminated body formed by peeling one protective film from the heat conductive sheet by which the protective film was bonded together on both surfaces is mentioned, for example. Specifically, the laminate includes a laminate having a heat conductive sheet and a protective film positioned on one side in the thickness direction of the heat conductive sheet.

(Adherent)
And as a to-be-adhered body which transfers a heat conductive sheet using the transfer method and transfer apparatus of the heat conductive sheet of this invention, it does not specifically limit, For example, heat generating bodies, such as an electronic component, and metal Examples include heat sinks such as heat sinks, heat radiating plates, and heat radiating fins.

(Thermal transfer sheet transfer method)
Here, in the method for transferring a heat conductive sheet according to the embodiment of the present invention, a heat conductive sheet of a laminate having a heat conductive sheet and a protective film positioned on one side in the thickness direction of the heat conductive sheet is attached. The process (A) bonded together and the process (B) which peels a protective film from the heat conductive sheet of the laminated body bonded by the to-be-adhered body are included. And it is necessary to perform peeling of the protective film in the step (B) from one end side to the other end side of the heat conductive sheet while applying pressure to the other end side of the peeling position using a holding jig. is there.

  Thus, if the pressure is applied to the other end side of the peeling position using a pressing jig when peeling the protective film in the step (B), the heat conductive sheet is broken or peeled off when the protective film is peeled off. It is possible to suppress a part of the heat conductive sheet from being peeled off from the adherend (so-called floating) by being pulled by the film, and to transfer the heat conductive sheet to the adherend satisfactorily.

<Process (A)>
Here, in the step (A), for example, as shown in FIGS. 1A and 1B, the heat conductive sheet 11 and the protection located on one side in the thickness direction of the heat conductive sheet (upper side in FIG. 1). The heat conductive sheet 11 of the laminate 10 having the film 12 is bonded to the adherend 20.

Specifically, in the step (A), first, as shown in FIG. 1A, one (lower side in FIG. 1) protective film from the heat conductive sheet 11 having protective films 12 and 13 bonded to both sides. 13 is peeled off to obtain the laminate 10 having the heat conductive sheet 11 and the protective film 12.
In FIG. 1A, the length of the protective film 12 is longer than that of the heat conductive sheet 11 from the viewpoint of facilitating peeling of the protective film 12 in the step (B). If it is more than the length of the heat conductive sheet 11, it will not be limited to the example of illustration. Further, in FIG. 1A, the length of the protective film 13 is made equal to that of the heat conductive sheet 11 from the viewpoint of ease of manufacturing a laminate having the protective film 12 longer than the heat conductive sheet 11, The length of the film 13 is not limited to the illustrated example, and the protective film 13 may not be provided from the beginning.

  Next, at a process (A), as shown in FIG.1 (b), the heat conductive sheet 11 of the laminated body 10 is bonded to the to-be-adhered body 20. FIG. Specifically, the laminate 10 is placed on the adherend 20 so that the heat conductive sheet 11 and the adherend 20 are in contact with each other, and optionally, pressure is applied to the laminate 10 using the holding jig 30. Thereby, the heat conductive sheet 11 of the laminated body 10 and the adherend 20 are brought into close contact with each other.

More specifically, in step (A), for example, the pressing jig 30 is moved from the other end side (right side in FIG. 1) to the one end side (left side in FIG. 1) of the heat conductive sheet 11 on the laminate 10. The heat conductive sheet 11 and the adherend 20 are brought into close contact with each other by applying pressure to the laminate 10 by sliding.
Note that the pressure load applied to the stacked body 10 using the holding jig 30 may be performed using only the weight of the holding jig 30 or in the direction toward the stacked body 10 with respect to the holding jig 30. You may carry out by applying external force. Among these, from the viewpoint of satisfactorily adhering the heat conductive sheet 11 and the adherend 20, the pressure load on the laminate 10 is controlled by applying an external force to the holding jig 30 that slides on the laminate 10. It is preferable to carry out while pressing the tool 30 against the laminate 10.
Further, the direction in which the holding jig 30 is moved in the step (A) is not limited to the one end side from the other end side of the heat conductive sheet 11. However, from the viewpoint of efficiently transferring the heat conductive sheet 11 by continuously performing the operation of peeling the protective film 12 from one end side to the other end side of the heat conductive sheet 11 after the step (A). The holding jig 30 is preferably slid from the other end side to the one end side of the heat conductive sheet 11.

[Pressing jig]
Here, the pressing jig 30 is not particularly limited, and a jig having an arbitrary shape capable of applying pressure to the stacked body 10 can be used.
Specifically, as the pressing jig 30, for example, a jig having a shape as shown in FIG. 2A and a right side view in FIG. 2A and FIG. 2B can be used. 2A and 2B, the pressing jig 30 is in contact with the protective film 12 of the laminated body 10 so as to apply pressure to the laminated body 10, and on the side opposite to the pressing surface 31 side. It further includes an engaging portion 33 that engages with a guide member such as a slide rail that guides the pressing jig 30 when the heat conductive sheet 11 is transferred. More specifically, the holding jig 30 shown in FIGS. 2A and 2B includes a rectangular parallelepiped main body portion whose bottom surface serves as a pressing surface 31, and laterally outwards from upper portions of both side surfaces of the main body portion (see FIG. The engaging portion 33 protrudes in the left-right direction in FIG. 2A, and the grip portion 32 protrudes upward from one side in the length direction of the upper surface of the main body (left side in FIG. 2B). Yes. As will be described in detail later, a surface (a surface formed by the main body portion and the grip portion 32 and orthogonal to the pressing surface 31) on one side in the length direction (left side in FIG. 2B) of the pressing jig 30 is When the protective film 12 is peeled off as shown in FIGS. 1C to 1E, the peeling angle regulating surface 34 regulates the peeling angle of the protective film 12.

  The shape of the holding jig is not limited to the shape shown in FIGS. 2 (a) and 2 (b). As the holding jig, for example, right side views are shown in FIGS. 3 (a) to 3 (c). The holding jigs 30A to 30C having the shapes as shown can also be used. Incidentally, the front view shape of the holding jigs 30A to 30C is the same as the front view shape of the holding jig 30 shown in FIG.

  Here, in the holding jig 30A shown in FIG. 3A, the lower portion of the main body has a shape (arc column shape) formed by cutting a cylinder in the axial direction, and the shape of the bottom surface is the length direction ( 2 has the same configuration as that of the pressing jig 30 shown in FIG. 2 except that the shape of the cross section along the direction in which the pressing jig is slid is a shape having a convex curve toward the lower side. According to the holding jig 30A, since the shape of the cross section along the length direction is a convex curve toward the lower side, the pressing jig 30A is slid on the laminated body 10 and pressure is applied to the laminated body 10. When the load is applied, the pressing jig 30A can be slid well on the laminate 10, and the laminate can be more effectively pressed with a small contact area.

  Moreover, the pressing jig 30B shown in FIG. 3B and the pressing jig 30C shown in FIG. 3C each have a peeling angle regulating surface that regulates the peeling angle of the protective film 12 when the protective film 12 is peeled off. 2 has the same configuration as that of the pressing jig 30 shown in FIG. 2 except that the arrangement angle 34 is an angle (greater than 90 ° or less than 90 °) inclined with respect to the pressing surface 31. And according to the holding jigs 30B and 30C, the protective film 12 can be easily peeled in an oblique direction. In addition, the arrangement | positioning angle of the peeling angle control surface 34 of the holding jigs 30B and 30C can be set according to a desired peeling angle. Specifically, for example, the arrangement angle of the peeling angle regulating surface 34 of the pressing jig 30B can be more than 90 ° and not more than 135 ° with respect to the pressing surface 31, and the peeling angle regulating surface of the pressing jig 30C. The arrangement angle 34 can be 45 ° or more and less than 90 ° with respect to the pressing surface 31.

<Process (B)>
Next, at a process (B), as shown, for example to FIG.1 (c)-(e), the protective film 12 is peeled from the heat conductive sheet 11 of the laminated body 10 bonded by the to-be-adhered body 20. FIG.

Specifically, in the step (B), as shown in FIGS. 1C and 1D, the heat conductive sheet 11 moves from one end side (left side in FIG. 1) to the other end side (right side in FIG. 1). In addition, the protective film 12 is peeled off while applying pressure to the other end side of the peeling position R using the holding jig 30. In other words, in the step (B), for example, the pressing jig 30 is moved to the other end side at a speed equal to the speed at which the protective film 12 is peeled from one end side to the other end side of the heat conductive sheet 11. The protective film 12 is peeled in a state where the pressing jig 30 is positioned on the region adjacent to the peeling position R of the unpeeled protective film 12. And as shown in FIG.1 (e), the transcription | transfer of the heat conductive sheet 11 from the laminated body 10 to the to-be-adhered body 20 is completed by peeling all the protective films 12 from the heat conductive sheet 11. FIG.
In this way, if the protective film 12 is peeled off while applying pressure to the other end side of the peeling position R (the part on the peeling position R side in the region where the protective film 12 is not peeled) using the holding jig 30. For example, even if a heat-conductive sheet with high adhesiveness or a thin heat-conductive sheet is used, the heat-conductive sheet 10 can be satisfactorily transferred to the adherend 20 by preventing the heat-conductive sheet 10 from being broken during transfer. it can.

  Here, as the pressing jig 30, it is preferable to use the same pressing jig as that used in the above-described step (A). Different pressing jigs may be used in step (A) and step (B), but if the same pressing jig 30 is used in step (A) and step (B), the jig can be replaced. This is because the time required can be reduced and the heat conductive sheet 11 can be efficiently transferred.

  In addition, the direction in which the protective film 12 is peeled off while the holding jig 30 is moved may be from the other end side to the one end side of the heat conductive sheet 11, but in the step (A), the holding jig 30 is moved to one end side. From the viewpoint of efficiently transferring the heat conductive sheet 11 by continuously performing the operation of peeling the protective film 12 after the heat transfer sheet 11, it is preferable to change the heat conductive sheet 11 from one end side to the other end side.

Furthermore, the pressure load using the pressing jig 30 may be performed using only the weight of the pressing jig 30, or an external force F in the direction toward the laminated body 10 is applied to the pressing jig 30. May be performed. Among these, from the viewpoint of sufficiently suppressing the heat conductive sheet 10 from being broken and transferring the heat conductive sheet 10 to the adherend 20 more satisfactorily, the pressure load at the time of peeling the protective film 12 is the laminate 10. It is preferable to perform the pressing jig 30 while pressing the pressing jig 30 against the laminate 10 in the vicinity of the peeling position R by applying an external force F to the pressing jig 30 that slides upward.
In addition, it is preferable that the magnitude | size of the external force F is a magnitude | size from which the pressure loaded via the pressurization surface 31 will be 2 kPa or more and 200 kPa or less, for example. If the applied pressure is equal to or higher than the lower limit value, the heat conductive sheet 10 and the adherend 20 can be satisfactorily adhered to each other. Moreover, if the applied pressure is less than or equal to the above upper limit value, the heat conduction sheet 10 can be sufficiently transferred to the adherend 20 while sufficiently suppressing the heat conduction sheet 10 from being broken.

Further, the peeling angle θ of the protective film 12 in the step (B) (the angle formed by the peeled surface 12A of the protective film 12 and the surface 11A of the thermally conductive sheet 11 from which the protective film 12 has been peeled) is 45 ° or more, for example. Preferably, the angle is 90 ° or more, more preferably 135 ° or less. If the peeling angle θ is within the above range, the heat conductive sheet 10 can be transferred to the adherend 20 more satisfactorily.
Note that, from the viewpoint of ease of peeling operation, the peeling angle θ is preferably adjusted using the peeling angle regulating surface 34 provided on the holding jig 30. That is, the protective film 12 is preferably peeled in a state where the protective film 12 is in contact with the peel angle regulating surface 34 of the pressing jig 30.

(Thermal transfer sheet transfer device)
The transfer of the heat conductive sheet by the above-described heat transfer sheet transfer method is not particularly limited and can be efficiently performed using, for example, the heat transfer sheet transfer device according to the embodiment of the present invention. .

Here, FIGS. 4A and 4B show a heat transfer sheet transfer apparatus 100 according to an embodiment of the present invention.
The transfer device 100 illustrated in FIG. 4 is provided on the pressing jig 30, the guide portion 40 that guides the pressing jig 30, and one side in the extending direction of the guide portion 40 (upper left in FIG. 4A). The fixing unit 50 includes a frame unit 60 that supports the guide unit 40 and the fixing unit 50 so as to be rotatable between a transfer position illustrated in FIG. 4A and a retracted position illustrated in FIG. Yes.

<Pressing jig>
The holding jig 30 is a jig having a pressing surface 31 that applies pressure to the laminated body 10 when the heat conductive sheet 11 is transferred, and a grip portion 32 that protrudes on the side opposite to the pressing surface 31 side. And as the pressing jig 30, for example, the same jigs that can be used in the above-described heat transfer sheet transfer method, such as the pressing jigs 30, 30A, 30B, 30C shown in FIGS. be able to.

<Guide part>
The guide portion 40 is a portion that engages with the engaging portion 33 of the pressing jig 30 and guides the pressing jig 30 in a straight line. As shown in the plan view of the guide unit 40 and the fixed unit 50 in FIG. 5A, in the transfer apparatus 100, the guide unit 40 is configured by two slide rails that are spaced apart from each other and arranged in parallel. . The pressing jig 30 is used by inserting the engaging portion 33 into the slide hole 41 of the guide portion 40 whose side view is shown in FIG.
The height H ₂ of the bottom surface of the guide portion 40 until the slide hole 41 is usually less height H ₁ from the bottom surface of the pressing jig 30 (pressure face 31) to the engaged portion 33, the height H ₂ is preferably low than the height H _1. This is because if the height H ₂ is equal to or less than the height H ₁ , the pressure can be easily applied to the stacked body 10 via the pressing surface 31 of the pressing jig 30. Further, the distance between the two slide rails constituting the guide portion 40 can be any length as long as it is equal to or greater than the width of the laminate 10. Further, the length of the slide hole 41 (that is, the range in which the pressing jig 30 can slide) is the sum of the length of the heat conductive sheet 11 of the laminate 10 and the length along the sliding direction of the pressing jig 30. If it is above, it can be set as arbitrary length.

<Fixed part>
The fixing portion 50 is a portion that fixes one end of the laminated body 10 to the adherend 20 when the heat conductive sheet 11 is transferred. The fixing unit 50 of the transfer device 100 is formed integrally with the guide unit 40. That is, the fixed portion 50 is connected to one end (left end in FIG. 5) of the guide portion 40 in the extending direction, and the guide portion 40 and the fixed portion 50 are flat as shown in the plan view of FIG. It has a U-shape.

  Further, a shaft hole 53 through which the rotation shaft 51 is inserted is formed in the fixed portion 50 along the width direction of the fixed portion 50 (vertical direction in FIG. 5A). And the fixing | fixed part 50 inserts the rotating shaft 51 in the shaft hole 53 and a through-hole in the state which has located the shaft hole 53 and the through-hole formed in the frame body part 60 explained in full detail on the same axis line. Thereby, it attaches so that rotation with respect to the frame part 60 is possible.

Further, as shown in the bottom view of the guide portion 40 and the fixing portion 50 in FIG. 5C, the fixing portion 50 is a laminated body on the bottom surface side (the side that comes into contact with the adherend 20 when the heat conductive sheet 11 is transferred). 10 has a positioning mechanism for determining the arrangement position. Specifically, the fixing unit 50 of the transfer device 100 includes a positioning mechanism including a rectangular groove 52 formed on the bottom surface of the fixing unit 50 and an adhesive member (not shown) provided in the groove 52. Have. The groove 52 is formed at the approximate center of the bottom surface of the fixed portion 50 on the guide portion 40 side, and is open between two slide rails constituting the guide portion 40. The width of the groove 52 is usually equal to or greater than the width of the stacked body 10. In addition, the depth of the groove 52 is normally set to be equal to or greater than the total thickness of the end portion of the laminate 10 attached in the groove 52 and the thickness of the adhesive member.
Here, the adhesive member is not particularly limited, and is a self-adhesive sheet (for example, the product name “Zeon AL sheet” (for example, product name “Zeon AL sheet” Zeon Kasei))) and the like. Above all. Double-sided tape is preferred as the adhesive member because it is easy to install and handle.

  Since the transfer device 100 has a positioning mechanism on the bottom surface side of the fixed portion 50, for example, the stacked body 10 can be easily attached to the fixed portion 50 at the retracted position to position the stacked body 10 during transfer. Can do. Further, since the positioning mechanism is formed by the groove 52 and the adhesive member provided in the groove 52, a simple configuration is used by attaching and fixing the laminate 10 to the adhesive member in the groove 52. Thus, the laminated body 10 can be easily positioned. Further, by sticking and fixing the end portion of the laminated body 10 in the groove 52, it is possible to prevent the fixing portion 50 from being lifted due to the thickness of the laminated body 10 when the heat conductive sheet 11 is transferred.

<Frame body part>
The frame portion 60 is a portion that pivotally supports the guide portion 40 and the fixed portion 50 so as to be rotatable between the transfer position and the retracted position. As shown in FIG. These are made of a plate-like member having a U-shape in plan view and capable of accommodating the guide portion 40 and the fixing portion 50 inside. And the through-hole extended in the width direction is provided in the opening part side of the frame-shaped body part 60 of planar view, and the said through-hole and the axial hole 53 of the fixing | fixed part 50 are on the same axis line. By inserting the rotating shaft 51 through the shaft hole 53 and the through hole in the positioned state, the fixing portion 50 is rotatably attached to the opening side of the frame body portion 60. Further, on the bottom surface of the frame body portion 60, positioning pins 61 for arbitrarily inserting into holes or the like formed in the adherend 20 and fixing the frame body portion 60 at a desired position of the adherend 20 are provided. Is provided.

<Transfer of thermal conductive sheet using transfer device>
And in the transfer apparatus 100 which has the structure mentioned above, as shown to Fig.6 (a)-(e), the heat conductive sheet 11 can be transcribe | transferred from the laminated body 10 to the to-be-adhered body 20, for example.

Specifically, first, one protective film is peeled off from a heat conductive sheet having a protective film bonded to both sides to prepare a laminate 10 having a heat conductive sheet 11 and a protective film 12. Then, as shown in FIG. 6A, one end of the obtained laminate 10 is attached to the adhesive member in the groove 52 of the fixing portion 50, and the positioning pin 61 of the frame portion 60 is attached. The frame body portion 60 is fixed to a desired position on the adherend 20 by being inserted into a hole (not shown) formed in the body 20.
In addition, the laminated body 10 affixes the surface by the side of the protective film 12 on the adhesive member in the groove | channel 52. FIG. When the transfer device 100 is used, the protective film 12 of the laminate 10 is usually longer than the heat conductive sheet 11. The distance L ₁ from one end of the protective film 12 on the side attached to the adhesive member to one end of the heat conductive sheet 11 is the length of the protective film 12 attached in the groove 52 and the sliding of the pressing jig 30. It is more than the sum with the length along the direction. The length of the heat conductive sheet 11 is such that the guide portion 40 and the fixing portion 50 are positioned at the transfer position and the pressing jig 30 is positioned on the fixing portion 50 side as shown in FIG. 2, the heat conductive sheet 11 fits in a space defined by the holding jig 30, the guide part 40, and the frame body part 60. Furthermore, the distance L ₂ from the other end of the heat conduction sheet 11 to the other end of the protective film 12, in a state where the guide portion 40 and the fixing unit 50 is located at the transfer position, as shown in FIG. 6 (b), at least This is the length that the protective film 12 extends to the frame body portion 60.

  Next, as shown in FIG. 6B, the guide part 40 and the fixing part 50 are moved to the transfer position, and the heat conductive sheet 11 is placed on the adherend 20. At this time, one end (the left end in FIG. 6B) of the protective film 12 of the laminate 10 is fixed between the fixing unit 50 and the adherend 20. Further, the other end portion (the right end portion in FIG. 6B) of the protective film 12 of the laminated body 10 passes through the frame body portion 60 so as to be easily grasped when the protective film 12 is peeled off. Extend to the outside.

  Thereafter, as shown in FIGS. 6B and 6C, the holding jig 30 is moved from one end side (the left side in FIGS. 6B and 6C) to the other end side ( 6 (b) and 6 (c), it is moved to the right side), and pressure is applied to the laminated body 10 via the pressing surface 31 of the pressing jig 30 to bring the heat conductive sheet 11 into close contact with the adherend 20. The movement of the pressing jig 30 and the load of pressure on the stacked body 10 through the pressing jig 30 can be easily performed by holding the holding portion 32 of the pressing jig 30 with a hand, a robot arm or the like (not shown). it can.

  And finally, as shown to FIG.6 (d) and (e), the other edge part of the protective film 12 of the laminated body 10 is held and pulled up with a hand, a robot arm, etc., and the protective film 12 is heat-conductive sheet. 11 to complete the transfer of the heat conductive sheet 11. Specifically, in FIG. 6D and FIG. 6E, the pressing jig 30 is fixed to the fixing portion 50 on the laminate 10 while applying pressure to the left region of the peeling position through the pressing surface 31 of the pressing jig 30. And the protective film 12 is pulled in a state in which the protective film 12 is in contact with the peeling angle regulating surface 34 of the holding jig 30, thereby causing the protective film 12 to have a desired peeling angle θ (FIG. 6D, It peels from the heat conductive sheet 11 at (90) in (e). The movement of the pressing jig 30 and the load of pressure on the stacked body 10 through the pressing jig 30 can be easily performed by holding the holding portion 32 of the pressing jig 30 with a hand, a robot arm or the like (not shown). it can. Further, the peeled protective film 12 can be removed from the adherend 20 together with the transfer device 100.

The heat conductive sheet transfer method and transfer device according to the embodiment of the present invention have been described above, but the heat conductive sheet transfer method and transfer device of the present invention are not limited to the above-described embodiments.
Specifically, for example, a known positioning mechanism such as a pin or a clip may be employed as the positioning mechanism of the transfer device. Moreover, you may fix by pinching | pinching the edge part of a laminated body with a fixing | fixed part and a to-be-adhered body, without providing a positioning mechanism. Furthermore, a known guide member such as a guide rail may be employed as the guide portion. Moreover, you may provide a positioning pin in the bottom face of a guide part, without providing a frame part.

EXAMPLES The present invention will be specifically described below with reference to examples, but the present invention is not limited to these examples.
In Examples and Comparative Examples, the adhesive force and tensile strength of the heat conductive sheet and the state of the heat conductive sheet after transfer were measured and evaluated using the following methods, respectively.

<Adhesive strength of thermal conductive sheet>
The adhesive strength of the upper surface of the produced heat conductive sheet (the surface directly hit by the blade during slicing) was measured using a probe tack tester (trade name “TAC1000” manufactured by Resuka Co., Ltd.). Specifically, after pressing a flat probe having a diameter of 10 mm on the top surface of the heat conductive sheet for 10 seconds under the conditions of a temperature of 25 ° C. and a load of 0.5 N, the force required to pull the probe away from the heat conductive sheet is used as the adhesive force. It was measured.
<Tensile strength of heat conductive sheet>
The produced heat conductive sheet was punched out with dumbbell No. 2 described in JIS K6251 to produce a sample piece. Then, using a tensile tester (manufactured by Shimadzu Corporation, trade name “AG-IS20kN”), a point of 1 cm from both ends of the sample piece is pinched, and the normal line coming out from the surface of the sample piece at a temperature of 23 ° C. Then, the film was pulled at a tensile speed of 500 mm / min in a perpendicular direction, and the breaking strength (tensile strength) was measured.
<The state of the heat conductive sheet after transfer>
The state of the heat conductive sheet after peeling off the protective film was visually observed and evaluated according to the following criteria.
A: Heat conduction sheet does not float or break B: Heat conduction sheet does not break, but there is a float of 2 mm or less C: Heat conduction sheet does not break, but there is a float of more than 2 mm D: Heat There is a tear in the conductive sheet

Example 1
<Preparation of heat conductive sheet>
0.1 parts by mass of carbon nanotubes (CNT) prepared using the super-growth method and 50 parts by mass of expanded graphite (manufactured by Ito Graphite Industries Co., Ltd., trade name “EC-100”, average particle size: 190 μm) And a composition obtained by mixing 100 parts by mass of a thermoplastic fluororesin that is liquid at room temperature (Daikin Kogyo Co., Ltd., trade name “DAIEL G-101”), a Wonder Crush Mill (Osaka Chemical Co., Ltd., product) Name “D3V-10”) and crushed for 1 minute.
Next, 5 g of the crushed composition was sandwiched between polyethylene terephthalate films having a thickness of 50 μm that had been subjected to sand blasting, and the roll gap was 550 μm, the roll temperature was 50 ° C., the roll linear pressure was 50 kg / cm, and the roll speed was 1 m / min. Roll forming was performed to obtain a composite material sheet having a thickness of 500 μm. Then, the obtained composite material sheet was cut into 6 cm × 6 cm × 500 μm, 120 sheets were laminated in the thickness direction, pressed under a pressure of 0.1 MPa at a temperature of 120 ° C. for 3 minutes, and subjected to thermocompression bonding. A 6 cm laminate was obtained.
After that, the 6 cm × 6 cm laminated section of the laminate of the composite material sheet was sliced using a woodworking slicer (manufactured by Marunaka Steel Co., Ltd., trade name “Super Finished Planer Super Mechanism S”), The obtained sheet (thickness: 150 μm) was cut into a size of 5 cm × 1.5 cm with a cutter knife to obtain a heat conductive sheet (5 cm × 1.5 cm × 150 μm).
And the adhesive force and tensile strength of the obtained heat conductive sheet were measured. The results are shown in Table 1.
<Attaching the protective film>
A protective film (manufactured by Fujiko Co., Ltd., general release film, thickness 75 μm) having a size of 9 cm × 1.5 cm was attached to both surfaces of the produced heat conductive sheet. Specifically, the protective film is temporarily placed on both surfaces of the heat conductive sheet so that the entire surface of the heat conductive sheet is covered and both ends of the protective film in the longitudinal direction protrude from the longitudinal ends of the heat conductive sheet by about 2 cm. After stopping, using a press machine (manufactured by Shinto Kogyo Co., Ltd., precision heating and pressurizing device, trade name “CYPT-20”), it is pressed for 30 seconds at a pressure of 0.2 MPa and a temperature of 25 ° C. A protective film was affixed on both sides.
<Transfer of thermal conductive sheet>
One protective film was peeled off from the heat conductive sheet having the protective film pasted on both sides, and a laminate having a heat conductive sheet and a protective film located on one side in the thickness direction of the heat conductive sheet was obtained.
Further, a transfer device having the same configuration as the transfer device shown in FIG. 4 is used except that the presser jig 30C shown in FIG. Transcription was performed.
Note that a copper plate was used as the adherend. In addition, when the heat conduction sheet is brought into close contact with the adherend by sliding the pressure jig and when the protective film is peeled off from the heat conduction sheet, the holding part of the pressure jig is grasped with a finger and headed to the laminate. The pressing jig was moved while applying external force in the direction. Further, the peel angle θ of the protective film was 135 °.
And the state of the heat conductive sheet after transfer was evaluated. The results are shown in Table 1.

(Example 2)
2 is used instead of the holding jig 30C at the time of transfer of the heat conductive sheet, and the heat conductive sheet of the heat conductive sheet is the same as in Example 1 except that the peeling angle θ of the protective film is set to 90 °. Production, application of a protective film, and transfer of a heat conductive sheet were performed. Measurements and evaluations were performed in the same manner as in Example 1. The results are shown in Table 1.

(Example 3)
When transferring the heat conductive sheet, heat was applied in the same manner as in Example 1 except that the holding jig 30B shown in FIG. 3B was used instead of the holding jig 30C, and the peeling angle θ of the protective film was set to 45 °. Production of a conductive sheet, application of a protective film, and transfer of a heat conductive sheet were performed. Measurements and evaluations were performed in the same manner as in Example 1. The results are shown in Table 1.

Example 4
When peeling off the protective film from the heat conductive sheet, it was the same as in Example 1 except that pressure was applied to the laminate using only the weight of the holding jig 30C without applying external force in the direction toward the laminate with a finger. Then, a heat conductive sheet was produced, a protective film was attached, and the heat conductive sheet was transferred. Measurements and evaluations were performed in the same manner as in Example 1. The results are shown in Table 1.

(Examples 5-7)
At the time of producing the heat conductive sheet, the amount of carbon nanotubes was changed to 0.5 parts by mass (Example 5), 1.0 part by mass (Example 6) and 2.0 parts by mass (Example 7), respectively. Except for the above, production of a heat conductive sheet, attachment of a protective film, and transfer of the heat conductive sheet were performed in the same manner as in Example 1. Measurements and evaluations were performed in the same manner as in Example 1. The results are shown in Table 1.

(Example 8)
When peeling the protective film from the heat conductive sheet, it was the same as in Example 2 except that pressure was applied to the laminate using only the weight of the holding jig 30 without applying external force in the direction toward the laminate with a finger. Then, a heat conductive sheet was produced, a protective film was attached, and the heat conductive sheet was transferred. Measurements and evaluations were performed in the same manner as in Example 1. The results are shown in Table 1.

Example 9
When peeling the protective film from the heat conductive sheet, it was the same as in Example 3 except that pressure was applied to the laminate using only the weight of the holding jig 30B without applying external force in the direction toward the laminate with a finger. Then, a heat conductive sheet was produced, a protective film was attached, and the heat conductive sheet was transferred. Measurements and evaluations were performed in the same manner as in Example 1. The results are shown in Table 1.

(Comparative Example 1)
When removing the protective film from the heat conductive sheet, the transfer device was removed from the adherend, and the protective film in a non-pressurized state was peeled off by hand without using a pressing jig. Preparation of a heat conductive sheet, attachment of a protective film, and transfer of the heat conductive sheet were performed. Measurements and evaluations were performed in the same manner as in Example 1. The results are shown in Table 1.

  From Table 1, it can be seen that in Examples 1 to 9, it is possible to prevent the heat conduction sheet from being broken and to transfer the heat conduction sheet to the adherend satisfactorily. On the other hand, in the comparative example 1, it turns out that a heat conductive sheet will be torn at the time of peeling of a protective film.

  According to the heat conductive sheet transfer method and transfer apparatus of the present invention, the heat conductive sheet can be satisfactorily transferred from the laminate having the heat conductive sheet and the protective film to the adherend.

DESCRIPTION OF SYMBOLS 10 Laminated body 11 Heat conductive sheet 12, 13 Protective film 20 To-be-adhered body 30, 30A-30C Holding jig 31 Pressurization surface 32 Holding part 33 Engagement part 34 Peeling angle control surface 40 Guide part 41 Slide hole 50 Fixing part 51 Rotation Shaft 52 Groove 53 Shaft hole 60 Frame portion 61 Positioning pin 100 Transfer device θ Peeling angle F External force R Peeling position

Claims (9)

It is a transfer method of a heat conductive sheet that transfers the heat conductive sheet from a laminate having a heat conductive sheet and a protective film to an adherend,
A step of bonding the heat conductive sheet of a laminate having a heat conductive sheet and a protective film located on one side in the thickness direction of the heat conductive sheet to the adherend (A),
A step (B) of peeling the protective film from the heat conductive sheet of the laminate laminated to the adherend;
Including
In the step (B), the protective film is peeled off while applying pressure to the other end side of the peeling position from one end side to the other end side of the heat conducting sheet and using a holding jig. Sheet transfer method.   In the step (B), the protective film is peeled so that an angle formed between a peeled surface of the protective film and a surface of the heat conductive sheet from which the protective film is peeled is 45 ° or more. The transfer method of the heat conductive sheet as described in 2.   The method for transferring a heat conductive sheet according to claim 1 or 2, wherein in the step (B), pressure is applied to the other end side of the peeling position by applying an external force and pressing the pressing jig against the laminated body. The step (A) is a step of placing the laminate on the adherend, and the laminate placed on the adherend by applying pressure to the laminate using a pressing jig. A step of closely adhering the heat conductive sheet and the adherend,
The same pressing jig is used in the step (A) and the step (B), and in the step (A), the pressing jig is moved from the other end side to the one end side of the heat conductive sheet. The heat according to claim 1, wherein pressure is applied while the pressure is applied while moving the pressing jig from one end side to the other end side of the heat conductive sheet in the step (B). Conductive sheet transfer method. A transfer device for a heat conductive sheet used when transferring the heat conductive sheet from a laminate having a heat conductive sheet and a protective film to an adherend,
A pressing jig having a pressing surface for applying pressure to the laminate and a gripping portion protruding on the side opposite to the pressing surface side;
A guide portion for guiding the holding jig;
A fixing portion that is provided on one side in the extending direction of the guide portion and fixes one end of the laminated body to the adherend;
A heat transfer sheet transfer device.   The heat transfer sheet transfer device according to claim 5, wherein the fixing portion has a positioning mechanism for the laminated body on a side in contact with the adherend.   The heat transfer sheet transfer device according to claim 6, wherein the positioning mechanism includes a groove formed on a side of the fixing portion that contacts the adherend, and an adhesive member provided in the groove.   The heat transfer sheet transfer device according to claim 5, wherein the pressing jig has a peeling angle regulating surface that regulates an angle at which the protective film is peeled from the laminated body. A frame body part that rotatably supports the guide part and the fixed part between a transfer position and a retracted position;
The heat transfer sheet transfer device according to claim 5, wherein the guide part and the fixing part are supported by the frame body part via a rotation shaft provided in the fixing part.

Images