KR101527383B1 - Thermal Diffusion Sheet with High Thermal Diffusivity of Vertical Axis and Horizontal Axis and Manufacturing Method and Apparatus - Google Patents

Abstract

The present invention relates to a method and an apparatus for manufacturing a thermal diffusion sheet having a high thermal diffusivity in the transverse direction and an axial direction, and more particularly to a method for manufacturing a thermal diffusion sheet having a high thermal conductivity And a manufacturing method thereof.
A binder, and a filler; a coating step of coating a liquid mixture of the solvent, the binder and the filler in a predetermined sheet form by a coater; A second sheet manufacturing step in which the binder contained in the primary sheet is removed from the second heating chamber, and the shape of the secondary sheet is fixed And a melting step in which the filler in the secondary sheet is melted in the third heating chamber.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thermal diffusion sheet having a high thermal diffusivity in a transverse direction and an axial direction,

The present invention relates to a method and an apparatus for producing a thermal diffusion sheet having a high thermal diffusivity in a transverse direction and an axial direction and more particularly to a method for manufacturing a thermal diffusion sheet having a high thermal conductivity in a transverse direction and an axial direction, And a manufacturing apparatus.

As the performance of electronic devices increases, the amount of power consumption increases, and accordingly, the amount of heat generated in electronic devices also increases.

Excessive heat generated inside the electronic device can not guarantee the normal operation of the device, which lowers the reliability, causes component failure and shortens the life span, and damages the component by thermal stress or thermal expansion.

As measures for heat dissipation of electronic devices, one or more of a heat sink or a cooling fan may be attached near a heating element, or a thermal grease may be applied between a heat conductive sheet and a heating element to apply heat grease to the outside There is a way.

Particularly, since thermal grease has no adhesive force, it can be flowed to a board or a fin at the time of coating, and it is troublesome to apply it with care so that the amount of thermal grease to be applied is not excessively small or excessive.

In addition, the conventional heat conductive sheet has a problem that the thermal conductivity in the transverse direction is high, but the heat radiation efficiency in the axial direction is poor.

An object of the present invention is to provide a method and an apparatus for producing a thermal diffusion sheet in which a filler is filled at a high density and thermal diffusivity in the transverse direction and the axial direction is high.

An object of the present invention is to provide a method and apparatus for producing a thermal diffusion sheet which can simplify a heating process by controlling the temperatures of a plurality of rollers included in a coater machine.

An object of the present invention is to provide a method and an apparatus for producing a thermal diffusion sheet which can easily adhere to a heat generating source and thereby dissipate heat of electronic equipment.

According to another aspect of the present invention, there is provided a method of manufacturing a thermal diffusion sheet,

A binder, and a filler; a coating step of coating a liquid mixture of the solvent, the binder and the filler in a predetermined sheet form by a coater; A second sheet manufacturing step in which the binder contained in the primary sheet is removed from the second heating chamber, and the shape of the secondary sheet is fixed And a melting step in which the filler in the secondary sheet is melted in the third heating chamber.

Further, the method for producing a thermal diffusion sheet of the present invention is a method for producing a thermal diffusion sheet, comprising the steps of mixing a solvent, a binder and a filler in a uniform manner, and a step of mixing the solvent, the binder and the filler, A second sheet production step in which the binder contained in the primary sheet is removed in a second heating chamber, and the shape of the secondary sheet is in a fixed state, And a melting step in which the filler in the sheet is melted in the third heating chamber.

Further, the method further includes a sheet cooling step in which the molten secondary sheet in the third heating chamber is cooled in a water-cooled manner after the melting step.

Further, the method further comprises a rolling step in which the thickness of the molten secondary sheet in the third heating chamber is controlled and the density is increased after the melting step.

Further, the method may further include an adhesive layer forming step of forming an adhesive layer on one side or both sides of the molten secondary sheet in the third heating chamber after the melting step.

In addition, the apparatus for producing a thermal diffusion sheet of the present invention is characterized in that it comprises a mixing machine in which a solvent, a binder and a filler are uniformly mixed, a coater machine in which a liquid mixture of the solvent, the binder and the filler is coated in a predetermined sheet form, A second heating chamber in which the binder contained in the primary sheet is removed to produce a secondary sheet, and a second heating chamber in which the secondary The shape of the car seat includes a third heating chamber in which the filler in the secondary sheet is melted in a fixed state.

Further, the blender is characterized in that an impeller is contained in the blender so that the blender is uniformly mixed.

The apparatus may further include at least one of a hood or a fan for recovering the vaporized vapor of the solvent or the binder in the first heating chamber and the second heating chamber.

Further, the present invention is characterized by further comprising a cooling unit in which the molten secondary sheet in the third heating chamber is cooled in a water-cooled manner.

Further, the apparatus further comprises a rolling mill which is rolled so that the thickness of the molten secondary sheet in the third heating chamber is adjusted and the density is increased.

The thermal diffusion sheet may further include an adhesive layer addition device for adding an adhesive layer to one surface or both surfaces of the thermal diffusion sheet.

As described above, according to the method and apparatus for producing a thermal diffusion sheet according to the present invention, it is possible to obtain a thermal diffusion sheet having a high thermal diffusivity in the axial direction as well as in the transverse direction.

In addition, since the present invention removes the solvent and the binder to increase the density of the filler, it is possible to obtain a thermal diffusion sheet having a high thermal diffusion efficiency.

In addition, the present invention has an effect of obtaining a thermal diffusion sheet which can easily adhere to a heat generating source and easily dissipate the heat of the electronic device.

Further, by controlling the temperatures of a plurality of rollers included in the cotter machine differently, the process can be further simplified.

Further, by recovering the vaporized solvent of the solvent and the binder, the environment of the workplace can be improved and the recovered steam can be reused.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a flowchart showing a manufacturing process of a thermal diffusion sheet according to the present invention;
2 is a schematic view briefly showing an apparatus for producing a thermal diffusion sheet according to the present invention.
3 is a block diagram briefly showing an apparatus for producing a thermal diffusion sheet according to the present invention.
4 is a graph showing the thermal conductivity of each type of graphite particles.

Specific features and advantages of the present invention will be described in detail below with reference to the accompanying drawings. The detailed description of the functions and configurations of the present invention will be omitted if it is determined that the gist of the present invention may be unnecessarily blurred.

The present invention relates to a method and an apparatus for manufacturing a thermal diffusion sheet having a high thermal diffusivity in a transverse direction and an axial direction and more particularly to a method for manufacturing a thermal diffusion sheet having a high thermal conductivity in a transverse direction and an axial direction, And a manufacturing apparatus.

2 is a schematic view briefly showing an apparatus for producing a thermal diffusion sheet according to the present invention, and FIG. 3 is a schematic view showing the apparatus for producing a thermal diffusion sheet according to the present invention And FIG. 4 is a graph showing the thermal conductivity of each type of graphite particles.

As shown in FIG. 1, the method for producing a thermal diffusion sheet includes a mixing step (S1) in which a solvent, a binder and a filler are uniformly mixed, and a liquid phase compounding material in which the solvent, (S2) of coating a sheet-shaped coating material, a primary sheet production step (S3) of removing a solvent contained in the compound material coated in the sheet form in a first heating chamber, and a binder (S5) in which the filler in the secondary sheet is melted in the third heating chamber in a fixed state in the form of the secondary sheet do.

Further, another manufacturing method of the thermal diffusion sheet includes a mixing step (S1) in which a solvent, a binder and a filler are uniformly mixed, and a plurality of heating rollers in which a liquid state compounding material in which the solvent, A secondary sheet producing step S4 in which a binder contained in the primary sheet is removed in a second heating chamber; And a melting step (S5) in which the filler in the secondary sheet is melted in the third heating chamber in a fixed state.

In the compounding step (S1), a solvent contained in a proportion of 5 to 20% of the weight of the whole compounding solution, a binder contained in a proportion of 5 to 20% of the weight of the whole compounding solution and a binder in a proportion of 60 to 90% Is mixed with the filler.

The filler is composed of aluminum and graphite, and aluminum is contained in a proportion of 60 to 40% of the total weight of the filler. Therefore, graphite is contained at a ratio of 40 to 60%.

If necessary, a thermally conductive additive other than aluminum and graphite may be added and mixed.

Table 1 shows the thermal conductivity of each material.

Diamond c-BN AlN SiC Al ₂ O ₃ AnO Ag Cu Al Graphite Thermal conductivity
[W / m · k] 2000 600 300 60 36 25 427 398 237 470

As shown in Table 1, aluminum (Al) is a material having high thermal conductivity next to diamond, c-BN, graphite, silver (Ag), Cu and AIN, and graphite is a material having high thermal conductivity next to diamond and c-BN .

Also, aluminum and graphite are less expensive than diamond, BN, AlN and silver.

Therefore, aluminum and graphite are preferably used in small-sized electronic devices as low-priced and lightweight materials.

If necessary, it may contain copper (Cu) in place of aluminum of the filler. When copper is contained, aluminum may be malleable, which is a property of being thinly spread when pressed or pressed, and elongated and elongated The adhesiveness to the heat generating source is further improved.

FIG. 4 is a graph showing the thermal conductivity according to the shape of the graphite particles, and it can be confirmed that the graphite having the coarse particles in the same addition ratio has a higher thermal conductivity than the spheroid or spherical shape.

Accordingly, it is preferable to use rough and uneven particles of graphite for the production of a thermal diffusion sheet.

If necessary, BN or AlN having a high thermal conductivity may be added to produce a thermal diffusion sheet.

Since the BN and AlN are relatively expensive, they are compounded at 0.5 to 10% of the filler, and the sum of BN and AlN is 5 to 10% of the total filler.

Thus, the filler containing the additive (BN, AlN) is blended with graphite and aluminum contained in a proportion of 90 to 95% of the filler and additives (BN, AlN) contained in a proportion of 5 to 10% .

The solvent is a substance in which a chemical reaction with the solute to be dissolved does not occur, and the binder is dissolved. Therefore, the binder is dissolved in the solvent but no chemical reaction occurs.

Methyl (Ethyl Ketone), Toluene, Cyclo Hexanone and the like are present in the types of solvents used for industrial purposes. The rate of evaporation of n-Buthyl Acetate at 25 ° C ), The relative evaporation rate of each solvent is 3.7, toluene 2.1, and argon 0.23, and MEK evaporates most rapidly, followed by toluene and acetic acid.

The solvent may be one kind of solvent, or may be a mixed solvent in consideration of volatilization rate, solubility and the like. For example, when it is necessary to delay the volatilization rate, it is possible to control the volatilization rate by mixing another solvent having a low volatilization rate with one solvent.

Examples of the binder include acryl, urethane, PT, PE, and silicone, and a single kind of binder is used for mixing.

The binder serves to fix the filler and the additive until the second sheet production step (S4).

Further, due to the dissolution of the binder by the solvent, the compound material composed of the solvent, the binder, the filler or the solvent, the binder, the filler, and the additive becomes a liquid state.

In the coating step (S2), the liquid material compounded in the compounding step (S1) is coated in the form of a sheet having a constant thickness by the coater machine (200).

The primary sheet producing step (S3) is a step in which the solvent contained in the sheet-shaped coating material is removed in the first heating chamber.

The first heating chamber includes a first heating chamber, a second heating chamber, a third heating chamber, and a fourth heating chamber having sequentially increasing temperature characteristics.

The time for passing through the first to fourth heating chambers is 2 to 5 minutes. The temperature of the first heating chamber is from room temperature to 50 ° C, the temperature of the second heating chamber is from 50 to 70 ° C, the temperature of the third heating chamber is from 70 to 90 ° C, The room has a heating temperature which is successively increased from 100 to 120 ° C.

The first heating chamber, which is sequentially heated in this way, prevents the solvent from rapidly escaping from the compounding material, thereby preventing the primary sheet 11 from being cracked or damaged.

Also, since the primary sheet 11 is thin in film form, it is a sufficient time for the solvent to be removed from the entire primary sheet even if it is heated only for a short time of 2 to 5 minutes.

In another manufacturing method, as shown in FIG. 1, the compounding material in the compounding step (S1) is coated by a plurality of heating rollers included in the cotter machine (200).

A plurality of rollers 201 included in the coater 200 are disposed such that the surface temperature of the rollers sequentially increases from one end of the rollers to the other end of the rollers 201. The coating step S2 and the primary sheet manufacturing step S3 ) Can be carried out at the same time.

In order to remove the solvent, the surface temperature of the roller is sequentially increased from room temperature to 50 ° C, from 50 ° C to 70 ° C for the second-stage roller, from 70 ° C to 90 ° C for the third-stage roller, and from 100 ° C to 120 ° C for the fourth- And has a heating temperature.

The above-described heating roller is included to simplify the process of manufacturing the primary sheet.

The secondary sheet producing step S4 is a step of removing the binder to which the filler or the filler of the primary sheet and the additives BN and AlN are fixed and is heated at 450 to 500 DEG C for 4 to 5 minutes 2 Heat treatment is performed in the heating room.

Like the first heating chamber, the second heating chamber includes a plurality of heating chambers sequentially heated to 450 ~ 500 ° C, so that cracks or damage of the sheets can be prevented.

The third sheet manufacturing step S5 is a step in which the filler in the secondary sheet 12 is melted in the third heating chamber in a state that the shape of the secondary sheet 12 is fixed.

In order to melt the aluminum contained in the secondary sheet, a heat treatment is required at a temperature of 600 to 700 占 폚 for 4 to 5 minutes.

When copper is contained in place of aluminum, a temperature of 1000 to 1100 DEG C is required to melt copper.

Since the melting temperature of graphite is very high at 3,000 DEG C or more, it is preferable that aluminum or copper is melted rather than directly melted graphite.

Aluminum or copper is compounded in powder form to be uniformly contained between graphite, and when aluminum or copper is melted at a predetermined temperature, aluminum or copper are connected to each other to fix graphite in the sheet.

As shown in FIG. 1, in the method of manufacturing a thermal diffusion sheet according to the present invention, a sheet cooling step (S6a) in which the molten secondary sheet in the third heating chamber is cooled in a water-cooled manner may be further included.

Since the thermal diffusion sheet is heated to a temperature of 600 to 700 ° C when aluminum is included and 1000 to 1100 ° C when copper is included, a sheet cooling step (S6a) is required for rapid state stabilization and subsequent rapid processing .

In order to prevent the sheet from being damaged, when aluminum is mixed in the thermal diffusion sheet, the primary cooling is 500 to 600 ° C, the secondary cooling is 300 to 500 ° C, the tertiary cooling is 100 to 300 ° C, And the like.

When copper is mixed in the thermal diffusion sheet, the first cooling is performed at 800 to 1,000 ° C, the second cooling is 500 to 800 ° C, the third cooling is 200 to 500 ° C, and the fourth cooling is sequentially cooled to room temperature to 200 ° C .

In the sheet cooling step S6a, an air cooling type or a water cooling type cooling system may be used. However, since the air cooling type cooling is inefficient, a water cooling type cooling step is preferably included.

In the water cooling type cooling step, the thermal diffusion sheet passes near the pipe through which the cooling water flows, or passes through the cooling water sprinkling device to lower the temperature quickly to stabilize the sheet.

Also, as shown in FIG. 2, it is preferable that the diameter of the roller is large at first, but gradually decreases so that the moving speed is constant even if the length of the coated sheet is increased.

As shown in FIG. 1, the method of manufacturing a thermal diffusion sheet according to the present invention may further include a rolling step in which the thickness of the molten secondary sheet in the third heating chamber is adjusted and the density is increased.

During the process of passing through the first heating chamber and the second heating chamber in order to produce the thermal diffusion sheet, the solvent or the binder is evaporated, and voids are formed in the thermal diffusion sheet to lower the density or the thickness of the thermal diffusion sheet may not be constant .

When the thermal diffusion sheet is rolled in the rolling step, voids formed in the thermal diffusion sheet are removed to obtain a thermal diffusion sheet having a high density and a constant thickness.

Further, the rolling step may be such that the molten secondary sheet in the third heating chamber is rolled, or the cooled secondary sheet is rolled through the cooling step.

When the cooled secondary sheet is rolled, the density of the thermal diffusion sheet is increased and a glossy thermal diffusion sheet can be obtained.

1, in the method for producing a thermal diffusion sheet according to the present invention, after the melting step, an adhesive layer (not shown) is formed on one or both surfaces of the thermal diffusion sheet so that the thermal diffusion sheet can be easily attached to a heat source such as an electronic device. (S6c) may be further included.

Particularly, due to the formation of the adhesive layer, it is convenient to attach the thermal diffusion sheet to a small electronic device such as a smart phone.

In addition, an adhesive layer may be formed on a part of the thermal diffusion sheet according to the user's need.

In addition, a double-sided tape may be adhered to one or both surfaces of the thermal diffusion sheet, or a double-sided tape may be formed on a part of the thermal diffusion sheet according to the user's needs.

Further, a film of PET, PT or PE may be bonded to an adhesive layer formed on one surface or both surfaces of the thermal diffusion sheet or an adhesive layer formed on a part of the thermal diffusion sheet according to the user's needs.

Since PET, PT and PE materials are insulators, they may be required to adhere to electronic devices or to devices sensitive to electrical currents.

As shown in FIG. 2 and FIG. 3, a blending machine 100 in which a solvent, a binder and a filler are uniformly mixed, and a coater unit 100 in which a liquid compounding material in which the solvent, A first heating chamber 300 in which a solvent contained in the mixed material coated in the sheet form is removed to produce a primary sheet 11, and a binder contained in the primary sheet 11, A second heating chamber 400 in which the secondary sheet 12 is removed and a second heating sheet 400 in which the filler in the secondary sheet 12 is melted, (500).

In the blender 100, a solvent, a binder, and a filler are blended, and an additive may be further added to increase the thermal diffusion efficiency.

In the thermal diffusion sheet and the apparatus for manufacturing the same according to the present invention, the blender 100 includes an impeller 101 on the lower surface thereof.

The impeller (101) is a wing that is rotated so that the solvent, the binder, and the filler are uniformly mixed in the blender (100).

Since the filler is heavier than the solvent and the binder, the filler submerges to the bottom and is uniformly dispersed through the rotational motion of the impeller 101.

The impeller 101 may have various shapes such as a paddle type, a propeller type, a turbine type, and may be directly connected to a motor and rotated or rotated by the power of an electromagnet.

The kind of the impeller can be selected in consideration of the conditions such as viscosity and density difference of the blending material.

The impeller 101 may have a paddle shape, a propeller shape, a screw shape, a turbine shape, or the like depending on its shape. In order to mix or slowly mix the density difference material and the viscous material, a paddle type impeller, It is preferable to use a turbine-type impeller in order to mix or strongly mix the impeller.

In order to mix a large-capacity solution having a low viscosity or a small-capacity solution having an intermediate viscosity (100 cP), it is preferable to use a propeller-type impeller or a screw-type impeller to mix a small-

It is also preferable to use a dissolver mixer when a higher mixing efficiency is required in order to mix or strongly mix materials having a large difference in density.

In the coater 200, a liquid mixture of the solvent of the blender 100, a binder and a filler is coated in a predetermined sheet form.

The first heating chamber 300 includes a first heating chamber, a second heating chamber, a third heating chamber, and a fourth heating chamber. The first heating chamber includes a room temperature to 50 ° C, Deg.] C, the temperature of the third heating chamber is controlled to be 70 to 90 DEG C, and the temperature of the fourth heating room is controlled to increase gradually to 100 to 120 DEG C. [

In addition, the first heating chamber 300 may include a fan for rapidly removing the solvent.

In another manufacturing method, the temperature of the plurality of rollers 201 included in the first coater 200 is sequentially increased from the first to fourth heating chambers included in the first heating chamber 300, Respectively. Thus, the step of passing through the first heating chamber 300 can be omitted.

In the secondary heating room, heat treatment is performed at a temperature of 450 to 500 ° C. for 4 to 5 minutes in order to remove the binder such as acryl, urethane, PT, PE and silicone.

As shown in FIG. 2, the thermal diffusion sheet and the apparatus for manufacturing the same according to the present invention may include at least one of a hood 600 or a fan from which vaporized vapor of the solvent or the binder is recovered do.

Since the solvent has a rapid vaporization rate, the hood 600 can be mounted so that it can be recovered immediately after passing through the compounder 100.

In the third heating chamber 500, the filler in the secondary sheet 12 is melted while the shape of the secondary sheet 12 is fixed.

The filler includes aluminum and graphite, and may include copper that is more expensive than aluminum but more ductile than aluminum.

When the secondary sheet 12 is contained in aluminum, it is heated at a temperature of 600 to 700 ° C, and when copper is contained in the secondary sheet 12 at a temperature of 1000 to 1100 ° C for 4 to 5 minutes.

It is preferable that the melting point of the graphite is 3,000 DEG C or higher and the graphite particles are fixed due to the aluminum or copper rather than the graphite is directly melted.

Aluminum or copper is blended in powder form and uniformly contained between graphite. When aluminum or copper is melted at a predetermined temperature, aluminum or copper are connected to each other to fix the graphite to the inside of the sheet.

In the apparatus for producing a thermal diffusion sheet according to the present invention, at least one of a hood or a fan for recovering vaporized vapor of a solvent or a binder in the first heating chamber 300 and the second heating chamber 400 .

Examples of the solvent include toluene (Toluene), Cyclo Hexanone, Methyl (Methyl Ethyl Ketone) and the like, and the binder includes acryl, urethane, PT, PE and silicone.

When the solvent and the binder are recovered, they can be reused, and if the solvent or the binder recovery device is included, the atmospheric environment and the operator can be protected, and economical efficiency due to reuse can be obtained.

In the solvent vapor collected by the hood or the fan, there is a solvent recovery method of the activated carbon adsorption type as a method of recovering the solvent which can be reused.

When the solvent vapor passes through the activated carbon layer, it is adsorbed, and the solvent adsorbed on the activated carbon due to water vapor is desorbed and then condensed through the heat exchanger to obtain a liquid containing a solvent and water.

When the solvent is not mixed and the toluene is used alone, toluene and water are not mixed, so a fractionation filter or a centrifuge can be used to easily separate them.

Centrifugation and distillation separation methods are used for solvents or mixed solvents that are dissolved in water such as agrochemicals and MEK.

When the agar and MEK are not mixed, the agonist or MEK may be separated through a dehydration treatment by centrifugation.

When the agar, MEK or agar, MEK and toluene are mixed, the liquid containing the solvent and water is dehydrated by 90% or more through a centrifugal separator, and then the distillation separation method is used.

The distillation separation method is a separation method using the vaporization point difference of the solvent. The distillation separation method can be separated because the boiling point of the Annon is 156 ° C, the toluene is 110.6 ° C, and the MEK is 79.6 ° C.

The highest concentration of anion is recovered first, and the toluene and MEK vaporized during the distillation separation process undergo a cooling process.

Then, the toluene and MEK are separated and recovered by the distillation separation method through the centrifugation process in which residual water is removed again.

In the binder vapor collected by the hood or fan, the binder is recovered. When the collected binder vapor is cooled in the cooler to obtain a liquid containing water or the like, the binder is cooled until the binder becomes solid, And the binder is recovered.

Alternatively, the liquid containing the binder, water and the like may be centrifuged in a centrifugal separator by a binder, moisture or the like according to the density difference. The precipitated binder is separated into a fractionation filter.

Another method is that when the liquid is supplied with power, the binder is precipitated in the lower portion of the liquid to separate the binder and moisture.

In the apparatus for producing a thermal diffusion sheet according to the present invention, a cooling section in which the thermal diffusion sheet is cooled by water cooling is further included.

A rapid state stabilization of the secondary sheet 12 heated to a high temperature in the third heating chamber 500 and a cooling process for subsequent operations may be required.

The cooling step may include a water cooling type cooling device, and a pump is used to forcibly circulate water to cool the thermal diffusion sheet.

The thermal diffusion sheet is passed to the vicinity of the pipe through which the cooling water flows before being cut or wound, or passed through the cooling water spraying apparatus.

In order to cool the sheet sequentially in order to prevent the sheet from being damaged, when aluminum is mixed in the thermal diffusion sheet, the primary cooling is 500 to 600 ° C, the secondary cooling is 300 to 500 ° C, the tertiary cooling is 100 to 300 ° C, The car cooling can be gradually cooled from room temperature to 100 ° C or the like.

When copper is added to the thermal diffusion sheet, the first cooling is performed at 800 to 1,000 ° C, the second cooling is 500 to 800 ° C, the third cooling is 200 to 500 ° C, and the fourth cooling is gradually cooled to room temperature to 200 ° C .

The cooling water spraying apparatus may further include a device for recovering the cooling water and the steam.

The apparatus for producing a thermal diffusion sheet according to the present invention further includes a mill which is rolled so that the thickness of the molten secondary sheet in the third heating chamber is controlled and densified.

During the process of passing through the first heating chamber and the second heating chamber in order to produce the thermal diffusion sheet, the solvent or the binder is evaporated and voids are formed in the thermal diffusion sheet to lower the density or the thickness of the thermal diffusion sheet may not be constant .

In order to solve such a problem, a rolling step is included to roll the thermal diffusion sheet, remove the voids formed in the thermal diffusion sheet, and obtain a thermal diffusion sheet having a high density and a constant thickness.

The apparatus for producing a thermal diffusion sheet according to the present invention may further include an adhesive layer addition device in which an adhesive layer is formed so as to be easily attached and fixed to a heat source.

In particular, due to the adhesive layer addition device, it is convenient to attach the thermal diffusion sheet to a small electronic device such as a smart phone.

An adhesive layer may be formed on one side or both sides of the thermal diffusion sheet, or may be formed on a part of the thermal diffusion sheet according to the needs of the user.

Further, the double-sided tape may be attached to one surface or both surfaces of the thermal diffusion sheet, or may be attached to a part of the surface.

Further, a film having an insulating property such as PET, PT, PE or the like may be adhered to the adhesive layer.

Such a thermal diffusion sheet having a film having an insulating property is preferable for use in electronic devices sensitive to electric current flow.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is clearly understood that the same is by way of illustration and example only and is not to be taken as a limitation of the scope of the present invention. Or modify it. The scope of the invention should, therefore, be construed in light of the claims set forth to cover many of such variations.

10: Thermal diffusion sheet
11: primary sheet
12: Secondary seat
100: Mixer
101: Impeller
200: Coater machine
201: a plurality of rollers
300: First heating room
400: 2nd heating room
500: Third heating room
600: the hood

Claims (12)

A mixing step of uniformly mixing a solvent, a binder and a filler;
A coating step in which a liquid form compounding material in which the solvent, the binder and the filler are mixed is coated in a predetermined sheet form by a coater;
A first sheet manufacturing step in which the solvent contained in the sheet-shaped coating material is removed in a first heating chamber;
A secondary sheet producing step in which the binder contained in the primary sheet is removed from the second heating chamber;
Wherein the shape of the secondary sheet is a fixed state and the filler in the secondary sheet is melted in a third heating chamber
Wherein the first heating chamber sequentially increases the temperature so as to prevent the solvent from rapidly escaping from the compound material, thereby preventing cracking or damage of the primary sheet
A method for producing a thermal diffusion sheet. A mixing step of uniformly mixing a solvent, a binder and a filler;
A primary sheet production step in which a liquid state compounding material in which the solvent, the binder and the filler are mixed is coated in a predetermined sheet shape by a plurality of heating rollers included in a cotter machine;
A secondary sheet producing step in which the binder contained in the primary sheet is removed from the second heating chamber;
Wherein the shape of the secondary sheet is a fixed state and the filler in the secondary sheet is melted in a third heating chamber
Wherein the plurality of heating rollers are arranged such that the surface temperature of the rollers is sequentially increased from one roller to the other roller so that the sheet heating and the coating process are simultaneously performed
A method for producing a thermal diffusion sheet. 3. The method according to any one of claims 1 to 3,
After the melting step,
And a sheet cooling step in which the molten secondary sheet in the third heating chamber is cooled in a water-cooled manner
A method for producing a thermal diffusion sheet. 3. The method according to any one of claims 1 to 3,
After the melting step,
Further comprising a rolling step in which the thickness of the molten secondary sheet in the third heating chamber is adjusted and rolled so as to have a higher density
A method for producing a thermal diffusion sheet. 3. The method according to any one of claims 1 to 3,
After the melting step,
And an adhesive layer forming step of forming an adhesive layer on one or both surfaces of the molten secondary sheet in the third heating chamber
A method for producing a thermal diffusion sheet. A thermal diffusion sheet having a high thermal diffusivity in a transverse direction and an axial direction, which is produced by the method of any one of claims 1 and 2. A compounder in which a solvent, a binder and a filler are uniformly mixed;
A coater unit in which a liquid compounding material in which the solvent, the binder and the filler are mixed is coated in a predetermined sheet form;
A first heating chamber in which the solvent contained in the compounding material coated in the sheet form is removed to produce a primary sheet;
A second heating chamber in which a binder contained in the primary sheet is removed to produce a secondary sheet;
The shape of the secondary sheet includes a third heating chamber in which the filler in the secondary sheet is melted in a fixed state
Wherein the first heating chamber sequentially increases the temperature so as to prevent the solvent from rapidly escaping from the compound material, thereby preventing cracking or damage of the primary sheet
A device for producing a thermal diffusion sheet. 8. The method of claim 7,
Characterized in that the blender includes an impeller so as to be uniformly mixed therein
A device for producing a thermal diffusion sheet. 8. The method of claim 7,
Further comprising a hood or a fan for recovering the vaporized vapor of the solvent or the binder in the first heating chamber and the second heating chamber
A device for producing a thermal diffusion sheet. 8. The method of claim 7,
Further comprising a cooling unit in which the molten secondary sheet in the third heating chamber is cooled in a water-cooled manner
A device for producing a thermal diffusion sheet. 8. The method of claim 7,
Further comprising a mill which is rolled in the third heating chamber so that the thickness of the molten secondary sheet is controlled and density is increased
A device for producing a thermal diffusion sheet. 8. The method of claim 7,
Characterized by further comprising an adhesive layer addition device for adding an adhesive layer to one or both surfaces of the thermal diffusion sheet
A device for producing a thermal diffusion sheet.

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