JP2001183080A - Method for producing compressed mesh wick, and flat heat pipe provided with compressed mesh wick - Google Patents

Abstract

(57) [Summary] A flat heat pipe which is lightweight and has low thermal resistance when cooling various electronic components such as a semiconductor element having a high heat generation density, and a capillary tube used in the flat heat pipe. Provides a compressed mesh wick with excellent power. A method for manufacturing a compressed mesh wick for a flat heat pipe, comprising the following steps. (A) At least one band-shaped mesh is bent a plurality of times into a predetermined shape to prepare a folded wound mesh, and (b) the folded wound mesh is pressed to produce a compressed mesh wick. I do.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flat heat pipe for cooling various electronic components such as semiconductor elements, and a mesh wick used for the flat heat pipe, and more particularly, to a multi-piece mesh wick. The present invention relates to a flat heat pipe using the same, which is not deformed by the vapor pressure of a working fluid, is lightweight, and has a small thermal resistance.

[0002]

2. Description of the Related Art Electric and electronic components such as semiconductor elements mounted on various devices such as personal computers and electric and electronic devices such as electric power equipment generate a certain amount of heat when used. If the temperature of such an electric / electronic component rises excessively, its performance will be reduced or its life will be shortened. In recent years, the miniaturization of electric devices represented by personal computers and the like has progressed, and the development of technology for cooling electric and electronic components mounted on electric devices has attracted attention.

As a method of cooling an electric / electronic element requiring cooling (hereinafter referred to as a “part to be cooled”), for example, an air-cooled type, that is, a fan or the like is attached to a housing of the electric equipment to be mounted. There is known a method of preventing the temperature of a component to be cooled from excessively rising by cooling an atmosphere in the housing. This method is particularly effective for relatively large electric equipment.

In addition to the above-described air-cooling method, in recent years, a method of connecting a heat sink or a fin or the like to a component to be cooled and dissipating heat via the heat sink or the like has become effective. In some cases, a heat pipe is interposed between the heat sink or the fin and the component to be cooled. There is also known a technique in which an electric fan blows the heat sink, the fins, and the like to achieve higher cooling efficiency.

Hereinafter, the heat pipe will be described.
The heat pipe has a sealed cavity, and in the heat pipe, heat is transferred by phase transformation and movement of the working fluid contained in the cavity. Although there is heat transfer that conducts heat in a container (container) that constitutes a heat pipe, the heat transfer is usually relatively small compared to the heat transfer by the phase transformation and movement of the working fluid described above.

Next, the operation of the heat pipe will be briefly described. Taking a rod-shaped heat pipe as an example, a heat-generating component (component to be cooled) is connected near one end thereof, and a radiating fin is mounted near the other end. The part to which the component to be cooled is attached
), The working fluid evaporates due to the heat of the component to be cooled transmitted through the thick part of the container by heat conduction, and the vapor is attached to the fin (hereinafter, referred to as a “radiator or radiator”). Go to Then, the vapor returns to the liquid phase again in the heat radiating portion, and the heat is released to the outside from the cavity almost via the fins. In this way, heat is transferred from the heat absorbing section to the heat radiating section.

In order for the above-mentioned heat transfer to be performed continuously, the working fluid that has returned to the liquid phase on the heat radiation side is
It is necessary to move (reflux) to the endothermic side again. In the case of a gravity type heat pipe, the heat absorption side may be located below the heat radiation side (this form is called bottom heat). In this case, the working fluid in the liquid phase state due to the phase transformation on the heat radiation side returns to the heat absorption side due to gravity. However, when the heat-absorbing side is located above the heat-radiating side (such a form is called top heat), the recirculation of the working fluid to the heat-absorbing side becomes insufficient, and a phenomenon called so-called dryout occurs. There are cases.

The shape of the heat pipe has been attracting attention in recent years, in addition to a typical round pipe shape, a plate-shaped heat pipe. Plate-type heat pipes are sometimes called flat-type heat pipes, flat-type heat pipes, etc., but depending on their shape,
There are advantages such as easy contact with a cooled component such as a semiconductor element over a large area.

That is, the plate-type heat pipe has an advantage that it can come into contact with the component to be cooled on its wide main surface. Even in the case of using a plate-type heat pipe, it is desirable to use it in the bottom heat mode in order to further ensure the recirculation of the working fluid, as in the case of a round pipe-shaped heat pipe. Therefore, as a desirable mounting structure, the plate-type heat pipe is arranged so that one main surface thereof faces downward, a component to be cooled contacts the lower main surface, and a heat sink is attached to the other upper main surface. Structure is conceivable. In this case, the lower main surface portion is on the heat absorption side, and the upper main surface portion to which the heat sink is attached is on the heat radiation side, and the bottom heat mode is set.

However, in recent years, miniaturization of computers and the like has progressed, and electric and electronic devices on which components to be cooled are mounted have been expanded from stationary to portable. In particular, in the case of a small computer or the like, it may be assumed that it is used while being tilted to some extent. Under such circumstances, a plate-type heat pipe capable of maintaining a certain level of performance even in the top heat mode has been demanded. Further, as described above, the wick is disposed in the container to move (recirculate) the working fluid that has returned to the liquid phase state on the heat radiation side to the heat absorption side again, and the working fluid is moved by the capillary force of the wick. Reflux quickly to the endothermic side again.

[0011]

In a flat heat pipe, a mesh wick is used due to its shape. In order to increase the capillary force of the wick, it is conceivable to use a plurality of mesh-type wicks in an overlapping manner. However, when a plurality of mesh wicks are used, there are the following problems. That is, since the mesh itself has no rigid body, it is difficult to fix the mesh wick in the vertical and horizontal directions when the meshes are overlapped. As a result, it is difficult to contact only a specific inner wall inside the container, and the mesh contacts all surfaces, and the function as a heat pipe cannot be sufficiently exhibited.

[0012] Further, the overlapped mesh has a gap in the thickness direction. If there is a gap in the thickness direction of several meshes, the capillary force of the mesh decreases, the thermal resistance increases, and the function as a heat pipe decreases. Furthermore,
The mesh is usually formed of a thin wire having a diameter of about 30 to 150 microns. When the mesh is processed into a predetermined shape, fine wire swarf is generated, and the mesh contacts all surfaces inside the container, so that the function as a heat pipe cannot be sufficiently exhibited.

Accordingly, an object of the present invention is to use a light-weight flat heat pipe having a small thermal resistance and a flat heat pipe when cooling various electronic components such as semiconductor elements having a high heat generation density. Another object of the present invention is to provide a compressed mesh wick excellent in capillary force.

[0014]

Means for Solving the Problems The inventors have conducted intensive studies to overcome the above-mentioned conventional problems. as a result,
A single-piece band-shaped mesh is wound around a metal plate, a rod-shaped body, a cylindrical body, or the like (hereinafter, referred to as a “winding core”) used as a core, and a mesh of the wound body is prepared. When the compressed mesh wick is manufactured by removing the winding core from the mesh and pressing the wound mesh, the gap in the thickness direction is small even if many meshes are stacked, It has been found that an excellent compressed mesh wick can be provided.

[0015] Further, an opening is provided in the compression mesh wick, the side of the opening is bent (for example, bent at a right angle) to provide an opening bent portion, and further, a heat transfer block is disposed in the opening bent portion. It has been found that when the compression mesh wick is press-bonded to the heat transfer block, the capillary force of the compression mesh wick is increased, and it is possible to provide a flat heat pipe that is lightweight and has low thermal resistance.

The plate-type heat pipe of the present invention has been made based on the above-mentioned findings, and the first aspect of the method for producing a compressed mesh wick for a flat-type heat pipe according to the present invention is as follows. It has. (A) At least one band-shaped mesh is bent a plurality of times into a predetermined shape to prepare a folded wound mesh, and (b) the mesh of the folded wound is pressed to form a compression mesh wick. To manufacture.

A second aspect of the method for producing a compressed mesh wick for a flat heat pipe according to the present invention includes the following steps. (A) At least one belt-shaped mesh is wound around a winding core to prepare a winding mesh, (b) the core is removed from the winding mesh, and (c) the winding core is removed. The extracted wound mesh is pressed to produce a compressed mesh wick.

According to a third aspect of the present invention, there is provided a method for manufacturing a compressed mesh wick for a flat heat pipe, wherein a predetermined shape is punched at a predetermined position of the compressed mesh wick to form an opening, The method further includes the step of providing at least one opening bent portion formed by bending a side of the opening at a substantially right angle.

A first aspect of the flat heat pipe of the present invention includes the following members. (A) a container made of at least two plates having a closed cavity and having a heat absorbing surface and a heat radiating surface,
(B) a compression mesh wick comprising at least one band-shaped mesh formed by wrapping around two ends, which is provided by pressing on at least one of the heat absorbing surface and the heat radiating surface in the container. (C) a working fluid enclosed in the container.

A second aspect of the flat heat pipe of the present invention includes the following members. (A) a container made of at least two plates having a closed cavity and having a heat absorbing surface and a heat radiating surface,
(B) at least one heat transfer block for transmitting heat, which is provided to connect between the inner wall of the heat absorbing surface and the inner wall of the heat radiating surface inside the container;
(C) at least one of the heat-absorbing surface and the heat-dissipating surface in the container and at least one of two ends provided by crimping on the side surface of the heat transfer block formed by winding. (D) a hydraulic fluid sealed in the container.

Another embodiment of the method for producing a compressed mesh wick for a flat heat pipe according to the present invention comprises the following steps. (A) At least one band-shaped mesh and a thin metal foil are wound around a metal plate or a cylindrical body used as a core to prepare a composite mesh composed of a mesh of the wound body and the metal foil; The metal plate or the cylindrical body is extracted from the composite mesh of the body, and (c) the composite mesh of the wound body from which the metal body or the cylindrical body is extracted is pressed to produce a compressed mesh wick. .

Another aspect of the method for manufacturing a compressed mesh wick for a flat heat pipe according to the present invention further comprises a step of forming a cut portion between sides forming the bent portion of the opening.

In another aspect of the flat heat pipe of the present invention, the compression mesh wick is formed by winding a band-shaped mesh composed of a large number of sheets around a metal plate or a cylindrical body used as a core. A flat mold that is a wick prepared and prepared by extracting the metal plate or the cylindrical body from the mesh of the wound body, and pressing the wound mesh obtained by extracting the metal body or the cylindrical body. It is a heat pipe.

In another aspect of the flat heat pipe of the present invention, the compression mesh wick is formed by winding a plurality of band-shaped meshes and a thin metal foil around a metal plate or a cylindrical body used as a core. A composite mesh of the body is prepared, the metal plate or the cylindrical body is extracted from the composite mesh of the wound body, and the wound metal composite mesh from which the metal body or the cylindrical body is extracted is pressed and manufactured. It is a flat type heat pipe which is a finished wick.

In another aspect of the flat heat pipe of the present invention, an opening is formed at a predetermined position of the compression mesh wick by punching a predetermined shape, and a side of the opening is bent at substantially a right angle. It is a flat heat pipe provided with at least one opening bent portion formed by the above method.

In another aspect of the flat type heat pipe of the present invention, an opening is formed by punching a predetermined shape of the compression mesh wick into a predetermined shape, and the side of the opening is bent substantially at a right angle. A flat heat pipe provided with at least one opening bent portion formed by forming the heat transfer block in at least one of the opening bent portions.

One embodiment of the compressed mesh wick of the present invention is a compressed mesh wick composed of at least one band-shaped mesh whose two ends are formed by winding.

According to another aspect of the compressed mesh wick of the present invention, the compressed mesh wick is provided with an opening having a predetermined shape at a predetermined position, and a bent portion in which a side of the opening is bent substantially at a right angle. There is a compressed mesh wick.

[0029]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS With reference to the drawings, a method for manufacturing a compressed mesh wick and a flat heat pipe provided with the compressed mesh wick according to the present invention will be described in further detail.
The method for manufacturing a compressed mesh wick for a flat heat pipe according to the present invention includes the following steps. That is,
At least one belt-shaped mesh is wound around the core, a mesh of the wound body is prepared, the core is removed from the mesh of the wound body, and the wound body mesh from which the core is removed is pressed. Manufacture compressed mesh wicks.

FIG. 1 is a diagram schematically showing one embodiment of a method for producing a compression wick according to the present invention. As shown in FIG. 1A, a rectangular metal plate 2 as a winding core and a single band-shaped mesh 1 having a predetermined width and length are prepared. Align one end of Next, as shown in FIG. 1B, the belt-shaped mesh 1 is wound about 10 times with the metal plate 2 as a core, to prepare a wound mesh. Next, a metal plate is extracted from the wound mesh, and as shown in FIG.
The wound mesh 1 from which the metal plate has been extracted is pressed from both sides by a predetermined machine 3 to produce a compressed mesh wick.

The manufactured compressed mesh wick is shown in FIG.
As shown in (d), the end portion 4 having a width of about 5 mm or less is set on the side surface portion after being compressed. By treating the ends in this way, it is possible to prevent the mesh portion that has been wound up from falling apart. In addition, you may use a cylindrical body as a core instead of a metal plate. The size of the cylindrical body can be appropriately selected depending on the width of the mesh to be manufactured. A predetermined number of compressed meshes may be manufactured using one strip mesh, or a plurality of strip meshes may be stacked to manufacture a compressed mesh.

Further, the method for manufacturing a compressed mesh wick according to the present invention may include the following steps. That is,
At least one metal plate or cylindrical body used as a core
Wrap a strip of mesh and a thin metal foil to prepare a composite mesh consisting of a wound mesh and a metal foil, pull out a metal plate or cylindrical body from the wound composite mesh, The composite mesh of the wound body from which the body has been removed is pressed to produce a compressed mesh wick.

As described above, for example, a composite mesh of a mesh and a metal foil may be prepared by laminating a strip-shaped mesh and a thin metal foil one by one and winding them around a metal plate or the like serving as a core. By using a metal foil, it is possible to give a rigid body to the mesh, enhance the pressing effect, and reduce the gap in the thickness direction between the meshes.

Further, in the method for manufacturing a compressed mesh according to the present invention, an opening is formed by punching a predetermined shape in a predetermined position of the compressed mesh wick manufactured as described above, and the side of the opening is formed. The method may further include providing at least one opening bent portion formed by bending at a substantially right angle.

Further, the method for manufacturing a compressed mesh wick according to the present invention is characterized in that at least one band-shaped mesh is bent a plurality of times into a predetermined shape without using a metal plate or the like serving as a core, thereby forming a folded and wound mesh. And a method of producing a compressed mesh wick by pressing a folded and wound mesh. Since the compressed mesh wick manufactured as described above is a wick formed by folding and winding a continuous wick in a band shape, the plate-like body can be easily maintained, and the wick can be easily attached to the inner wall of the container.

FIG. 2 is a partially enlarged perspective view of a compressed mesh wick having an opening bent portion. FIG. 3 is a schematic partial side view of a compression mesh wick having an opening bent portion. FIG. 4 is a schematic partial plan view of a compression mesh wick having a plurality of opening bent portions.

As shown in FIG. 2, for example, a rectangular opening bent portion 5 is formed on the compressed mesh 1 manufactured by the process shown in FIG. That is, first, punching is performed to form an opening, and four sides 6 of the opening are
It is bent downward substantially at right angles to the mesh body to form a bent opening portion. The four sides 6 of the opening thus formed may have, for example, dimensions corresponding to the height inside the container. As a result, when the main body of the compression mesh is provided in close contact with the inner wall of one main surface inside the container, the tip of the side portion 6 comes into contact with the other main surface.

As shown in FIG. 3, the side portion 6 is bent at a right angle below the main body of the compressed mesh 1 and is positioned vertically. As shown in FIG. 4, in the present invention, a plurality of opening bent portions 5 may be provided in the compressed mesh wick 1. The size of the opening bent portion is determined in consideration of the size of the heat transfer block installed therein.

FIG. 7 is a partially enlarged view of the wick showing the opening bent portion provided with the cut portion. As shown in FIG. 7A, four sides 6 are provided in a rectangular opening bent portion 5 formed in the compressed mesh wick 1.
A cut portion 16 is further provided between the adjacent side portions 6. By providing the cut portions, chips of the mesh can be easily removed, and a decrease in the function of the mesh can be prevented. Further, FIG. 7B shows another mode of the opening bent portion provided with the cut portion. As shown in FIG. 7B, four sides 6 are provided in a vertically long rectangular opening bent portion 5 formed on the compressed mesh wick 1. A cut portion 16 is further provided between the adjacent side portions 6.

Next, the flat heat pipe of the present invention will be described. A flat heat pipe according to the present invention is a flat heat pipe including the following members. That is,
(A) a container made of at least two plates having a closed cavity and having a heat absorbing surface and a heat radiating surface,
(B) a compression mesh wick formed of at least one band-shaped mesh formed by winding two ends, which is provided by pressing on at least one of a heat absorbing surface and a heat radiating surface in a container; (c) ) Hydraulic fluid enclosed in a container.

Furthermore, the flat heat pipe of the present invention
It may be a flat heat pipe provided with the following members.
That is, (a) a container made of at least two plates having a closed cavity and having a heat absorbing surface and a heat radiating surface, and (b) a connection between the inner wall of the heat absorbing surface and the inner wall of the heat radiating surface inside the container. (C) at least one of a heat absorbing surface and a heat radiating surface in the container and a side surface of the heat transfer block. A compressed mesh wick comprising at least one band-shaped mesh formed by winding two ends,
(D) Hydraulic fluid sealed in the container.

FIGS. 5 and 6 are partial enlarged views of the flat heat pipe of the present invention. As shown in FIG. 5, a heat transfer block 12 is provided between a heat absorbing surface 11 and a heat radiating surface 10 of the container.
Are provided to connect between the respective inner walls. A compression mesh wick is provided from the inner wall of the heat radiating surface 10 to the side wall of the heat transfer block 12. The compression mesh wick is a compression mesh wick composed of at least one band-shaped mesh formed by winding two ends. As shown by reference numeral 13, the compressed mesh wick is, for example, formed by spot welding or the like.
It is crimped to the side wall of the heat transfer block and / or the inner wall of the heat dissipation surface. FIG. 6 shows another embodiment. As shown in FIG. 6, instead of spot welding, the compression mesh 1 is sandwiched by the member 14 or the member 15 and pressed against the side wall of the heat transfer block and / or the inner wall of the heat dissipation surface.

The compression wick used in the above-mentioned flat heat pipe will be described in more detail. As shown in FIG. 1, the compression wick of the present invention was prepared by winding at least one band-shaped mesh around a metal plate or a cylindrical body used as a core to prepare a wound mesh. This is a wick manufactured by extracting a metal plate or a cylindrical body as a core from the mesh of the wound body, and then pressing the wound mesh from which the metal body or the cylindrical body is extracted. The two ends of the compressed mesh wick of the present invention are not cut,
It is formed by winding.

Further, the compression wick of the present invention is obtained by winding at least one band-shaped mesh and a thin metal foil around a metal plate or a cylindrical body used as a core (for example, by sandwiching the band-shaped mesh and the thin metal foil into a sandwich shape). May be arranged and wound), a composite mesh of the wound body is prepared, a metal plate or a cylindrical body is extracted from the composite mesh of the wound body thus prepared, and then the metal body or A wick manufactured by applying a press to a wound composite mesh from which a cylindrical body is extracted may be used.
Further, a mesh of a wound body or a composite mesh may be prepared by using only a band mesh or a band mesh and a metal foil without using a metal plate or a cylindrical body as a core.

Further, as described above, an opening is formed by punching a predetermined shape in a predetermined position of the compressed mesh wick, and at least one opening formed by bending a side of the opening at a substantially right angle. It may have two opening bent parts. Furthermore, an opening is formed by performing a punching process of a predetermined shape at a predetermined position of the compression mesh wick,
At least one opening bent portion formed by bending a side portion of the opening at a substantially right angle may be provided, and the heat transfer block may be arranged in at least one of the opening bent portions.

The material of the container constituting the flat heat pipe is not particularly limited, but if a material having excellent thermal conductivity such as copper or aluminum is used, a flat heat pipe having excellent thermal performance can be obtained. Can be desirable.
Copper material is JIS standard C1020, C1100, C12
00, etc., also as JTS standard A11 as aluminum material
00, A3000 series, A5000 series, A6000 series and the like. An appropriate amount of working fluid (not shown) is stored in the container of the flat heat pipe. As working fluid,
In addition to water, there are alternative Freon, ammonia, alcohol, acetone, etc., which can be selected as appropriate according to the compatibility with the material of the container.

Although not shown, heat radiating fins may be provided on the heat radiating surface side of the container. In addition, it is more preferable to form the heat radiation fins as a part of the container and to integrally form the heat radiation fins with the container, because the heat transfer characteristics are further improved and the manufacturing cost is reduced.

The heat transfer block 12 may be metal-joined to its inner wall by soldering or brazing. It is desirable that the heat transfer block 12 be joined to the inner wall by metal joining, since the thermal resistance between them will be smaller. Although not shown, one or a plurality of projections may be provided on the plate material forming the heat absorbing surface of the container. At that time, the heat transfer block may be arranged in the convex portion.

The container may have a structure in which, for example, a single plate is pressed, the heating element is drawn, and the heating element is brought into flat contact with the heating element. Another sheet may be processed into a predetermined shape. As a method of joining two plates, there are generally a brazing method, laser welding, and the like. The brazing method is based on JIS of Cu / Ag in order to obtain the reliability of the heat pipe.
Standard BAG-8 is desirable. Further, as a brazing method, there are vacuum brazing, atmosphere brazing, and the like.

[0050]

EXAMPLE As shown in FIG. 1 (a), ten strip-shaped meshes having a thickness of 110 microns, a mesh of 100, a width of 100 mm and a length of 663 mm were superimposed, and their ends were fitted to a metal plate having a width of about 48 mm. Then, as shown in FIG.
A band-shaped mesh was wound around a metal plate. Next, the metal plate was pulled out from the mesh of the wound body, and pressed by applying a force of 150 to 200 kgf / cm ² as shown in FIG. As a result, a compressed mesh wick of about 51 mm × 100 mm was obtained. The thickness of the compressed mesh wick was about 1.5 mm or less. In addition, as shown in FIG.
mm. As a result, the gap between the compression meshes could be made extremely small. Furthermore, the fine lines of the mesh did not appear on the outer surface of the mesh.

As shown in FIG. 5, the thus prepared compressed mesh wick was pressure-bonded to the inner wall of the heat radiating surface of the flat heat pipe and the side wall of the heat transfer block by spot welding. As a result, a heat pipe excellent in capillary force was obtained.

[0052]

As described above, according to the present invention, since a plurality of belt-shaped meshes are wound and pressed to form a compressed mesh wick, a compressed mesh wick excellent in capillary force can be provided. Further, the above-described compressed mesh wick of the present invention is applied to a flat heat pipe, and the compressed mesh wick is crimped to the inner wall of the container and the side wall of the heat transfer block. When cooling, it is possible to provide a flat heat pipe that is lightweight and has low thermal resistance, and has high industrial utility value.

[Brief description of the drawings]

FIG. 1 is a view schematically showing a method for producing a compression wick of the present invention.

FIG. 2 is a partially enlarged perspective view of a compression mesh wick having a bent opening portion.

FIG. 3 is a schematic partial side view of a compression mesh wick having a bent opening portion.

FIG. 4 is a schematic partial plan view of a compression mesh wick having a plurality of opening bent portions.

FIG. 5 is a partially enlarged view of the flat heat pipe of the present invention.

FIG. 6 is a partially enlarged view of the flat heat pipe of the present invention.

FIG. 7 is a partial enlarged view of a wick showing an opening bent portion provided with a cut portion.

[Explanation of symbols]

 1. Compression mesh wick 2. Metal plate 3. Press machine 4. 4. End of band mesh Opening bent part 6. Edge 10. Heat dissipation surface of container 11. 11. Heat absorbing surface of container Heat transfer block 13. Crimping part 14. Crimping member 15. Crimping member 16. Notch

 ────────────────────────────────────────────────── ─── Continuing from the front page (72) Inventor Tadashi Ikeda ▲ Sight F-term in Furukawa Electric Co., Ltd. 2-6-1 Marunouchi, Chiyoda-ku, Tokyo 5E322 AA11 DB08 FA01 FA04 5F036 AA01 BB60

Claims (5)

[Claims] 1. A method of manufacturing a compressed mesh wick for a flat heat pipe, comprising the steps of: (a) bending at least one band-shaped mesh into a predetermined shape a plurality of times to form a folded wound mesh; It is prepared, and (b) a press is applied to the mesh of the folded and wound body to produce a compressed mesh wick. 2. A method of manufacturing a compressed mesh wick for a flat heat pipe, comprising the steps of: (a) winding at least one band-shaped mesh around a winding core to prepare a wound mesh; (B) The core is extracted from the mesh of the wound body, and (c) the wound mesh from which the core is removed is pressed to produce a compressed mesh wick. 3. A step of forming an opening by punching a predetermined shape in a predetermined position of the compressed mesh wick, and providing at least one opening bent portion formed by bending a side of the opening. The method for producing a compressed mesh wick for a flat heat pipe according to claim 1 or 2, further comprising: 4. A flat heat pipe provided with the following members: (a) a container made of at least two plates having a closed cavity and having a heat absorbing surface and a heat radiating surface;
(B) a compression mesh wick comprising at least one band-shaped mesh formed by wrapping around two ends, which is provided by pressing on at least one of the heat absorbing surface and the heat radiating surface in the container. (C) a working fluid enclosed in the container. 5. A flat heat pipe comprising the following members: (a) a container comprising at least two plate members having a closed cavity and having a heat absorbing surface and a heat radiating surface;
(B) at least one heat transfer block for transmitting heat, which is provided to connect between the inner wall of the heat absorbing surface and the inner wall of the heat radiating surface inside the container;
(C) at least one of the heat-absorbing surface and the heat-dissipating surface in the container and at least one of two ends provided by crimping on the side surface of the heat transfer block formed by winding. (D) a hydraulic fluid sealed in the container.