KR20140143113A

KR20140143113A - The manufacturing method of heat radiating sheet and the heat radiating sheet using the same

Info

Publication number: KR20140143113A
Application number: KR1020140068000A
Authority: KR
Inventors: 유종삼
Original assignee: 유종삼
Priority date: 2013-06-05
Filing date: 2014-06-04
Publication date: 2014-12-15
Also published as: KR20140143111A; KR20140143112A; KR101499887B1; WO2014196830A1; KR20140143119A

Abstract

An objective of the present invention is to solve a problem according to finishing of edges of an existing heat radiating sheet because a separate sheet is disposed at an edge of a first sheet with a radiation function through an automation process, that is, problems of lowering radiation performance and not easily attaching an additional film on upper and lower surfaces of a heat radiating sheet because separation between layers is achieved and particles are discharged. The method of manufacturing a heat radiating sheet includes: sequentially arranging a functional film with a heat radiating function and an insulation film on one surface of a base film with an adhesive strength; cutting the arranged adhering film in a specific form to an arranged depth of the functional film; removing an internal scrap cut from an insulation film after the cutting step; arranging a section adhesive film on a top surface of the adhesive film after removing the internal scrap; and removing an outer scrap of the functional film and the base film after supplying the section adhesive film.

Description

TECHNICAL FIELD [0001] The present invention relates to a heat-radiating sheet manufacturing method and a heat-radiating sheet manufactured by the above method. BACKGROUND OF THE INVENTION 1. Field of the Invention [0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat-dissipating method and a heat-dissipating sheet manufactured by the above-described method, and more particularly, (US 6,982, 874) heat-radiating sheet, that is, a problem caused by the delamination of the sheet or the leakage of particles or the formation of air gaps Air layer) is generated to deteriorate the heat dissipation performance and the adhesion of the additional film to the upper and lower surfaces of the heat radiation sheet is not easy, or when the heat radiation sheet is attached to the surface to be adhered, the adhesiveness is decreased or decreased due to the thickness deviation of the edge portion and the repulsive force of the insulating sheet A method of manufacturing a heat-radiating sheet having a technical feature of solving the problem To a heat-radiating sheet produced by the above-described method.

Smart phones with small computers are becoming popular, and smartphone heat is becoming a problem. This has not been a big problem in the past, but smart phones are becoming a hot issue as most mobile phones have been replaced with smartphones.

For example, if you see blogs, cafes, tweets, and facebooks on your smartphone, there are plenty of images or videos that take up a lot of time or are time consuming, such as a comparative test of having egg fritters and cheese. When you view an image or video through a smartphone, the internal temperature of the electronic device actually rises above 45 degrees.

As described above, a cooling pad has been developed as a method for solving the problem of heat generation of a smartphone. Although the cooling pad can be attached to the back of a smartphone, the heat generation problem can be solved, but the effect can not be taken for a long time.

And the problem of heat generation of these electronic devices is not a problem of a smartphone alone but a problem in all electronic devices, and it is emerging as a hot issue in recent years.

On the other hand, a sheet having thermal anisotropy with a large thermal conductivity in the plane direction as compared with the thickness direction is used as a member for moving heat from a heat source (heat source) to another place, and as the thermal conductivity in the plane direction becomes larger, A material having a large thermal conductivity in the plane direction has been developed.

The material having a good thermal conductivity in the plane direction is an expanded graphite sheet,

Such an expanded graphite sheet is disclosed in Korean Patent No. 10-0840532 and No. 10-0628031, and is used as a main sheet layer of a heat-radiating sheet.

In order to use such an expanded graphite sheet as a heat-radiating sheet, the insulating sheets 200 and 300 must be attached to the upper and lower portions of the expanded graphite sheet 100. In FIG. 1, the structure of a conventional heat-radiating sheet with an insulating sheet is shown.

That is, as shown in Fig. 1, when the expanded graphite sheet 100 is used as a heat-radiating sheet, the expanded graphite sheet itself should not be exposed to the outside. Therefore, when the insulating sheet is arranged above and below the expanded graphite sheet, the edge portions of the insulating sheets are brought into contact with each other, and the heat-radiating sheet is manufactured by sealing the insulating sheet.

However, in the case of the above-described structure, since the joint portion of the edge of the insulating sheet is joined in a state in which the height of the expanded graphite sheet is reduced by the thickness of the expanded graphite sheet, the upper and lower surfaces of the heat- do.

In addition, a protective film or an adhesive film is added to the upper surface to the lower surface of the heat-radiating sheet. However, there arises a manufacturing problem that it is difficult to adhere additional films due to the bending.

In addition, since the insulating sheet is positioned above and below the expanded graphite sheet, and the insulating sheets are sealed at the edges, a space S is formed between the sealed portion and the expanded graphite sheet side portion. There arises a problem that the heat radiation performance is lowered by the heat cycle.

Of course, depending on the cutting state, the insulating sheets 200 and 300 positioned up and down may not be formed as an outer edge of the expanded graphite sheet, and the expanded graphite sheet is exposed to the side surface. In this case, particles may come out of the expanded graphite sheet or the layer may be separated, which may also lead to degraded heat dissipation performance or adversely affect other nearby electrical circuits.

Accordingly, the heat-radiating sheet according to the present invention and the heat-radiating sheet according to the present invention have been proposed for solving the problems of the conventional heat-

In the edge treatment of an expanded graphite sheet (hereinafter referred to as a first sheet having a heat radiation function or a functional sheet), a separate insulating sheet is provided along the outer periphery of the expanded graphite sheet, It is an object of the present invention to provide a heat-radiating sheet which is capable of providing a flat upper and lower surfaces even after bonding with an insulating sheet and improving the durability and stability of adhesion of the heat-radiating sheet to the adherend without causing particles to be discharged or delamination And it is an object of the present invention to provide a manufacturing method that can be precisely and easily manufactured through an automated process in manufacturing such a heat radiation sheet.

According to an aspect of the present invention, there is provided a method of providing a heat-

A functional film having a heat radiation function as one surface of the adhesive base film on one surface, a film arrangement step of arranging the insulating film in order,

A cutting step of cutting the ordered laminated film into a specific shape to a depth at which the functional film is arranged;

An inner scrap removing step of removing the inner scrap cut in the insulating film after the cutting step;

A single-sided adhesive film input step of arranging a single-sided adhesive film on the upper surface of the laminated film after the internal scrap removing step, and

And removing the outer scrap and the base film from the functional film after the step of inserting the one-sided adhesive film.

And a double-sided adhesive film array step in which the double-sided adhesive film is joined to the bottom surface of the laminated film after the outer scrap removal step.

In addition, the step of inserting the single-sided adhesive film is characterized in that the single-sided adhesive film is attached and the inside is arranged as a functional film between the cut insulating films.

The heat-radiating sheet according to the present invention is a heat-radiating sheet manufactured by the above manufacturing method.

According to the heat-radiating sheet of the present invention having the above-described structure, no space is formed between the expanded graphite sheet (first sheet) and the insulating sheet (second and third sheets) It is possible to prevent direct external exposure of the expanded graphite sheet, thereby solving the problem of the separation of the particles from being discharged and the problem of delamination, thereby ultimately improving the heat radiation performance,

Further, the size difference between the first sheet and the second and third sheets at the outer portion can be compensated by the provision of the fourth sheet, so that the heat-radiating sheet provided with the eventually flat upper and lower surfaces is provided, You can expect.

Furthermore, in the manufacturing of the heat-radiating sheet, it is possible to easily manufacture the heat-radiating sheet through an automated process, and a cutting process can be performed at an accurate position through a structure of a guide hole, a guide pin and a hole cutter, The effect can be obtained.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a view showing a structure of a conventional heat radiation sheet. FIG.
2 is an assembled cross-sectional view illustrating a heat radiation sheet structure according to the present invention.
3 is an exploded perspective view showing a heat radiation sheet structure according to the present invention.
4 is a view schematically showing a manufacturing process of a heat-radiating sheet according to the present invention;
Fig. 5 is a view for showing a film forming state at a specific step in a manufacturing process of a heat-radiating sheet according to the present invention; Fig.
6 is a view schematically showing a heat radiation sheet manufacturing process of another embodiment according to the present invention.

Hereinafter, a method of manufacturing a heat-radiating sheet according to the present invention and a heat-radiating sheet manufactured by the above-described method will be described in detail with reference to the drawings.

First, for convenience of understanding, a heat-radiating sheet structure according to the present invention will be described.

That is, as shown in Figs. 2 and 3, the heat-

A first film (100) having a heat dissipating function, second and third films (200, 300) respectively arranged on upper and lower surfaces of the first film, and first and second films 4 film (400).

The second film 200 is a single-sided adhesive film having an adhesive layer formed on a surface to be brought into contact with the first film, and the third film 300 is a double-sided adhesive film for attaching the adherend to an adherend, Can be considered. Of course, the release film is attached to the exposed surface of the third film as the double-sided adhesive film.

Also, the first film 100 is a functional film having a heat dissipating function, so-called graphite film is considered. That is, the expanded graphite sheet or the expanded graphite sheet is subjected to an additional processing process. Of course, not only the graphite film but also a film made of copper or aluminum can be considered as a functional film having a heat radiation function. In this case, the corrosion problem can be solved by sealing the edge with the fourth film.

The second, third, and fourth films may be formed of an insulating material. The fourth film 400 may be a PET film.

Next, as shown in the drawing, the fourth film 400 is formed along the edge of the first film and is formed into a sheet-like sheet.

As a result, according to the present invention, bonding between the second and third films arranged on the upper and lower sides of the first film is not completed to complete the heat radiation sheet, but the first film 100 and the edges thereof After the fourth film 400 is arranged, the second film is bonded to the first film and the fourth film, and the heat-radiating sheet is completed by bonding the third film to the first film and the fourth film,

The problem of the conventional heat-radiating sheet, that is, in the case where the outer periphery of the heat-radiating sheet is not sealed, solves the problem that the graphite particles flow out while the edges thereof are opened and worn, and the layer separation occurs.

The problems such as the thickness variation of the marginal portion and the deterioration of adhesion or adhesion due to the repulsive force of the insulating sheet can not be maintained when the heat dissipating sheet is attached to the adherend.

Next, a method of manufacturing a heat-radiating sheet having an edge by a fourth film having an insulation property at the edges of the first film having a heat-radiating function, as described above, by an automated process will be described below.

Hereinafter, a first film having a heat radiation function under the same reference numeral is referred to as a functional film 100, and a fourth film formed along the edge of the first film is referred to as an insulation film 400 to describe a manufacturing process.

Of course, as described above, the third film mentioned above is replaced with the single-sided adhesive film 300, and the fourth film is replaced with the double-sided adhesive film 400. [

If two or more films are laminated, they are collectively referred to as a laminate film regardless of the type of laminated film.

In FIG. 4, a manufacturing process according to the present invention is briefly shown. In FIG. 4, the reference numerals C1, C2, and C3 shown in FIG. 4 show cutters for cutting a laminate film in which two or more films are laminated.

FIG. 5 shows a state of a laminated film in a specific process. FIG. 5 is a plan view showing the state of the laminated film, and FIG. 5 is a sectional view of the laminated film, Fig.

5A is a diagram showing a laminated film (base film-insulating film) in a process of passing through the first cutting machine C1, and FIG. 5B is a diagram showing the state 4 is a view showing a laminated film (base film-an insulating film from which internal scrap has been removed-functional film) in a process of passing between a fourth roll R4 and a second cutting machine C2, and [C] (The base film - the insulating film from which the inner scrap has been removed - the functional film cut along the cutting line) in the process of passing through the first cutter C2 and the second cutter C2 (Base film-the insulating film from which the inner scrap has been removed and the functional film from which the outer scrap has been removed) in the process of passing the roll R5, and [E] Fig. 2 is a view showing a heat-radiating sheet completed with a heat-

Next, the second cutting machine C2 is provided with a guide pin P for precisely controlling the cutting position of the laminated film to be fed (refer to FIG. 5 [C]). In the first cutting machine C1, (See FIG. 5 (A)) for forming a guide hole H for forming a guide hole in the laminated film and serving as a guide pin provided in the second cutting machine.

4 and 5, in the first section S1 shown in FIG. 4, the base film B and the insulating film 400 are provided in the downward direction and the upward direction, and the first cutter C1 .

That is, in the case of the laminated film passing through the first section and the first cutting machine, the insulating film 400 must be disposed on the upper surface of the base film B, so that the base film is supplied from the lower side to the first roll R 1, Is fed from the upper side to the second roll R2 positioned next to the first roll.

The base sheet (B) is removed in the finally completed heat radiation sheet. The base sheet (B) is formed on one surface of the heat radiation sheet, which is in contact with the insulation film (400).

Then, through the hole cutter (C4) provided in the first cutting machine while passing through the first cutting machine (C1) so that the cutting position can be accurately checked in the first and second cutting machines, H). In this case, the hole H may be formed in the base film B depending on whether the base film B is provided.

Then, the cutting is performed in the laminated film ('base film-insulation film' state) while passing through the first cutting machine, and the cutting blade C1a cuts the insulation film. That is, in the first cutting machine, an insulating film cutting step for cutting the inside of the insulating film 400 joined to the base film B into a specific shape is performed (see FIG. 5 [A]).

For reference, the specific form refers to a form in which the functional film is positioned in the final heat dissipation sheet (denoted by 100 'and 400' shown in FIG. 3) The functional film is placed in a position where it is cut into a specific shape while passing through.

The process of advancing from the first cutting machine to the second cutting machine is represented by the second section S2 in FIG.

As can be seen in the second section S2, the step of removing the scrap of the insulating film, which removes the inner scrap 400a while leaving an outer edge based on the cutting line 400 'formed on the insulating film after the insulating film cutting step And the third roll R3.

That is, a scrap removing film 500 having an adhesive layer formed on one side thereof is supplied to one side of the third rolls R3 arranged in the vertical direction, and the supplied scrap removing film 500 is wound on the cutting line 400 ', and the inner scrap 400a of the insulation film is adhered to the scrap removing film 500 and discharged to the outside.

The adhesive force between the scrap removing film 500 and the insulating film 400 is greater than the adhesive force between the insulating film 400 and the base film B. [

Then, the functional film 100, that is, the graphite film is supplied through the fourth roll and arranged on the upper surface of the insulating film 400 from which the scrap is removed (see FIG. 5B).

Since the film supply is pulled through the guide hole H formed in the insulating film 400 and the precise position control is possible, the width of the functional film 100 supplied through the fourth roll R4 is larger than the width of the insulating film 400 ).

Next, the base film and the insulating film-functional film, from which the inner scrap has been removed through the second section S2, are laminated in this order, passes through the second cutting machine C2.

The cutting blade C2a is provided in the second cutting unit C2 at the same position as the cutting edge of the insulating film 410 cut in the first cutting machine so that the inside of the functional film 100 is covered with the insulating film 410. [ Cutting is performed in the same manner as the cutting line made in the cutting step (functional film cutting step) (see Fig. 5 [C]).

As shown in Fig. 5 [C], the second cutting machine is provided with a guide pin (P) which allows the film fed to cut to the correct position of the film to be arranged at the correct position, P is inserted into the guide hole H of the laminated film to be fed into the second cutting machine C2, precise position control for cutting is performed.

In addition, the guide pin (P) is formed in a tapered conical shape having a narrow cross-sectional area toward the end, so that even when the position of the supplied composite film is slightly changed, the laminated film is moved along the tapered surface of the guide pin Set to exact cutting position.

Next, the joint film (the base film-the functional film on which the insulating film from which the inner scrap is removed-the cutting line is formed) discharged from the second cutting machine C2 is passed through the outer scrap 100a of the functional film through the third section S3, (The outer scrap removal step of the functional film).

The insulating film 400 and the functional film 100 are cut at a ratio of 1: 1, and then the functional film is placed in the insulating film, thereby completing the structure of the heat-radiating sheet. See Fig. 5 [D]).

Next, in the fifth roll, a single-sided adhesive film lamination step and a base film removing step in which the single-sided adhesive film 200 is inserted and the base film is removed are performed.

That is, the first end face adhesive film is supplied to the upper roll R5a located on the upper side in the fifth roll (R5) formed of a pair to form a laminate film (base film- the insulating film from which the inner scrap has been removed and the functional film from which the outer scrap has been removed ),

And the base film is removed through the lower roll R5b located under the fifth roll.

In particular, if the base film (B) is removed before the single-sided adhesive film (200) is removed, the predetermined position of the insulating film from which the internal scrap has been removed and the functional film from which the scrap has been removed is removed. It is desirable to fix the position of the insulating film from which the inner scrap has been removed and the outer film scraped functional film through the single-sided adhesive film, and then remove the base film.

Next, the double-sided adhesive film 300 is aligned and laminated on the lower surface of the laminated film (the scraped-away insulating film and the outer scrap-removed functional film-single-sided adhesive film) through the sixth roll R6 And the final heat-radiating sheet is discharged through the third cutting machine C3 (see Fig. 5 [E]).

The heat-radiating sheet according to the present invention can be manufactured precisely and simply with other processes than those described above. 6 shows another manufacturing process for manufacturing the heat-radiating sheet, in which the functional film 100 is first arranged on the upper surface of the base film B as compared with the above-mentioned process, and then the film of the functional film is sealed After the insulating film 400 is arranged, it is inserted into the special cutter C1 and cut into a specific shape.

That is, the base film (B) and the functional film (100) are fed through the first roll, the insulating film (400) is fed through the second roll disposed thereafter, The state becomes the order of the base film (B) -functional film (100) -insulating film (400) (film arranging step).

It is preferable that the widths of the base film and the insulating film are approximately the same, and the width of the functional film 100 disposed therebetween is smaller than that of the films.

Next, the laminated film arranged as described above is passed through a first cutting machine. In the first cutting machine, a hole cutter (not shown) for forming a guide hole H in a laminated film to be fed in the same manner as the first cutting machine mentioned in the above- C4 are provided so as to serve as guides while forming guide holes in the laminating film.

The inserted laminated film is cut into a specific shape by a cutting blade (C1a) provided in a first cutting machine, and the cutting depth is up to the functional film (100). That is, cutting is performed in a specific form up to the depth where the functional film is arranged (cutting step).

Thereafter, an internal scrap removing step of removing the inner scrap cut in the insulating film is performed after exiting the first cutting machine, and then the first film 200 is arranged through the third roll.

That is, since the internal scrap is a part of the insulating film, the functional film must be disposed through the subsequent process at the removed position, and the laminated film (base film-functional film- The first film 200 is placed on the upper surface of the first film 200.

The first film is a single-sided adhesive film. Through this process, the functional film is positioned inside the insulating film cut by the adhesive layer formed on the single-sided adhesive film,

As shown in the drawing, the functional film is positioned inside the insulating film, that is, the shape of the functional film 100 is sealed with the insulating film 400.

After the outer scrap 400a of the base film and the functional film is removed, the second film 300, that is, the double-sided adhesive film supplied through the fourth roll is arranged at the removed position, The final heat radiation sheet is completed.

While the present invention has been described with reference to the accompanying drawings, a heat-radiating sheet manufacturing method and a heat-radiating sheet manufactured by the above-described method having a specific shape and structure have been described. However, It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Description of the Related Art [0002]
100: first film (functional film) 200: second film (single-sided adhesive film)
300: Third film (double-sided adhesive film) 400: Fourth film (insulating film)
100a: scrap outside scrap 400a: scrap inside
500: Scrap removal film B: Base film
C1: first cutting machine C2: second cutting machine
C3: Third cutting machine C4: Hole cutting machine
C1a: Cutting blade C2a: Cutting blade
P: Guide pin H: Guide hole

Claims

A film arranging step of sequentially arranging a functional film having a heat-radiating function and an insulating film on one surface of an adhesive base film on one surface;
A cutting step of cutting the ordered laminated film into a specific shape to a depth at which the functional film is arranged;
An inner scrap removing step of removing the inner scrap cut in the insulating film after the cutting step;
A step of inserting a single-sided adhesive film to arrange the single-sided adhesive film on the upper surface of the laminated film after the internal scrap removing step; And
And removing the outer scrap and the base film of the functional film after the step of inserting the one-sided adhesive film.

The method according to claim 1,
Further comprising a double-sided adhesive film array step of bonding the double-sided adhesive film to the bottom surface of the laminated film after the outer scrap removing step.

The method according to claim 1,
Wherein the step of inserting the single-sided adhesive film comprises attaching a single-sided adhesive film so that the inside is arranged as a functional film between the cut insulating films.

4. The method according to any one of claims 1 to 3,
A heat-radiating sheet produced by the above-described manufacturing method.