KR101861840B1 - thermal pad using phase change material and method of making the same - Google Patents

Abstract

A plurality of phase change material cells distributed in a portion contacting with the body and filled with a phase change material and a plurality of phase change material cells disposed on the opposite side of the body based on the phase change material cells, And a method of manufacturing the same, wherein a plurality of air cells have a plurality of air cells, and gas inflow and outflow to and from the plurality of air cells are performed through air regulators connected to the air passages.
According to the present invention, the shape and distribution of air cells or phase change material cells and the pressure of each region can be adjusted to a desired shape, and the body posture can be continuously and periodically changed And it is possible to efficiently increase or adjust the portion touching the object to enhance the effect of object keeping and cooling.

Description

[0001] The present invention relates to a method of manufacturing a cold pad using a phase change material,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cold pad using a phase change material, and more particularly, to a cold pad using a phase change material and a cold pad capable of being used as a pad for a poultice, .

Most of the net matter emits or absorbs latent heat when there is a mutual change in a substance such as liquid, solid, or gas. The latent heat of the phase change of such a substance can be used for various purposes. Among these materials, when the latent heat released or absorbed during the phase change is large, and the phase change temperature is a temperature suitable for a specific purpose, the phase change phenomenon of these materials is frequently used for heating, cooling and maintaining the temperature.

Korean Patent Registration No. 101124577 discloses a method in which a thin film material in which a liquid is not permeable is disposed on both sides and a phase change material is thinly applied therebetween so that one or both surfaces are finely divided A phase change material microfilled material fabric is made by thermally pressing with an open substrate or a roll plate to form a material that reacts with heat forming the surface, and filling each fine space with a phase change material.

Korean Patent Registration No. 101247602 discloses a portable cooling mask pack made of a phase change material which is lightweight and easy to carry and which can obtain cold feeling anytime and anywhere as shown in FIG.

Korean Patent Application No. 10-2010-0008890 discloses a phase change material adsorption filled sheet, and Korean Patent Publication No. 10-2012-0059469 discloses techniques using other phase change phenomena.

Materials that are easy to use the phase change phenomenon are often referred to as phase change materials. Such a phase change material can be used for a hot pad or a pad for a cold pad.

However, when such padding pads are made flat and padded to the body part, the padding is bent or wound to deform the padding, or the padding may be adhered to the body, or a strap having a fastening member such as a velcro And it is often used in close contact with the body part.

However, there were many inconveniences to use a pad made of a flat pad to form a curved surface at the body part.

In order to solve this problem, it is possible to make a pad for a specific area, but these pads can only be used for padding the area, so the versatility is small and the demand is small. It is also very cumbersome and costly to have all the different types of pads for freshening the various areas.

Therefore, it would be desirable if there is a pad that can be flexibly deformed to the body part through its own control to enhance the effect of the poultice.

In addition, when the fomentation pad is placed under a large area such as a back or the like, if the user is not free, sleeps, or is unconscious, the posture is fixed and the foment area is specified, It may become uncomfortable and may cause partial physical damage such as a pressure ulcer.

In such a case, if there is a means of automatically changing the pad and the body contact area, the person can be relieved of the trouble and the risk of the user can be reduced.

Korean Patent No. 101124577 Korea Patent No. 101247602 Korean Patent Application No. 10-2010-0008890 Korean Patent Publication No. 10-2012-0059469

It is an object of the present invention to provide a cold pad capable of heating a hot pad or a cold pad using a phase change material and effectively controlling or increasing a portion contacting the human body to enhance the effect of the pad. .

It is another object of the present invention to provide a cold pad using a phase change material and a method of manufacturing the same, which enables adjustment of posture of a contacted body part while adjusting the three-dimensional shape as necessary.

In order to achieve the above object, the present invention provides a cold pad using a phase change material,

A plurality of phase change material cells distributed in the portion contacting the object such as the body and filled with the phase change material,

And a plurality of air cells which are installed on opposite sides of the object based on the phase change material cells and are distributed in a plurality of regions and can vary the amount of gas injected into each region.

In the present invention, an air regulator is usually provided to adjust the three-dimensional shape of a portion contacting the object by regulating gas inflow and outflow to the plurality of air cells.

In the present invention, the air regulator may be configured to regulate the air amount of the air cells in the corresponding region through different air injection paths. At this time, the air cells connected to the same area or the same route (route) can be connected to each other to have the same pressure.

In the present invention, the phase change material cell and the air cell may be formed by dividing the integrated cells into layers by an additional structure such as a partition wall in the integrated cell. In this case, the phase change material cells and the air cells at the same position are formed so as to cover the same area in the same form.

At this time, a phase change material may be enclosed in a separate pocket in the phase change material cell portion of the integrated cell space, or a porous material impregnated with the phase change material may be inserted and positioned.

A separate heat insulating material may be filled in the air cell portion or a heat insulating material cell surrounded by a separate pocket may be formed in a layered manner so that the latent heat of the phase change material may be concentrated on heating or cooling the object.

In the present invention, a plurality of air cells and a plurality of phase change material cells are provided on different bases to form a separate layer structure, and the inventive pads may be stacked.

In this case, the base on which the phase change material cells are installed may be provided with a heater capable of performing phase transformation of the phase change material through heat transfer.

In the present invention, at least one of the phase change material cells and the air cells may have different areas, thicknesses, and shapes in the cells.

According to another aspect of the present invention, there is provided a method of manufacturing a cold pad,

Preparing a pad upper plate, a pad middle plate, a pad lower plate,

A cavity forming a cavity forming a cavity for forming an air passage space serving as a path for supplying air to the integrated cell space and air from the outside to the upper plate of the pad is formed by using a first lower molding die of the cavity type, Molding a wall constituting a groove for forming an air passage space serving as a path for supplying air from the air cell space to an air cell space corresponding to a lower portion of the integrated cell space using a second upper mold having a protrusion type,

The pad upper plate having the integrated cell space formed therein is placed in the first lower molding die and the middle plate of the pad in which the air cell space is formed is placed so as to overlap when viewed from above the integrated cell space and the air cell space, Forming a phase change material cell in the integrated cell space excluding the air cell space by pressing the pad upper plate and the pad middle plate by pressing in the direction of the lower mold.

In general, the phase change material is filled in the lower part of the integrated cell space, that is, the space corresponding to the phase change material cell, before the formed pad upper plate and the pad middle plate are joined together. After the coupling step, the second upper forming mold is removed to seal the remaining space of the air cell, which is the remaining space of the integrated cell, and the lower pad is overlapped on the combined body of the pad middle plate and the pad upper plate. Or by pressurizing with a flat plate so that the pad plates are integrated together.

According to another aspect of the present invention, there is provided a second method of manufacturing a cold pad,

Forming a heat transfer layer in which a plurality of phase change material cells are distributed in a first base, forming a shape-deformed layer in which a plurality of air cells are distributed in a second base, combining the heat transfer layer and the shape- .

In the second manufacturing method, the heat transfer layer is formed by forming a wall constituting the phase change material cell space by using a cavity-type lower molding die on the pad upper plate, overlapping the lower pad on the formed pad upper plate, And sealing the phase change material cell space.

The step of forming the shape-deformed layer in the second manufacturing method includes forming a wall constituting an air cell space and an air passage space by using a cavity-type lower mold in the pad middle plate, superposing the pad lower plate on the molded pad, And sealing the air cell space while being pressurized. At this time, the pad lower plate and the upper forming die may be formed with a wall part forming a space for the air passage in the lower plate of the pad.

According to the present invention, it is possible to apply warm or hot poultice to the body part using the phase change material in the phase change material cell.

According to the present invention, the body posture can be changed to a desired shape by adjusting the shape and distribution of the air cells or the phase change material cells and the pressure of each region, and the body posture can be changed by changing the pressure in each region according to time. The user who uses the pads can not move for a long time, thereby preventing the surrounding muscles from hardening or causing pressure ulcers.

According to the present invention, the shape and distribution of the air cells or the phase change material cells and the pressure applied to the object can be effectively increased or controlled by controlling the pressure of each region, thereby enhancing the effect of object warming and cooling.

In the present invention, when the wall of the air cell has mechanical strength and maintains a constant shape and size regardless of the amount of air to be filled, the air conditioner removes the air of the air cells and uses the air cells as a heat insulating layer for the phase change material cells It is possible.

1 and 2 are views showing examples of conventional techniques using phase change materials.
3 is a perspective view illustrating a cold pad according to an embodiment of the present invention,
4 is a conceptual perspective view for explaining an embodiment of a cold pad manufacturing method of the present invention,
FIG. 5 is a perspective view illustrating a configuration concept of a cold pad according to another embodiment of the present invention, FIG.
FIG. 6 is a conceptual perspective view for explaining a method of forming a shape-deformed layer for manufacturing a cold pad as shown in FIG. 5;
FIG. 7 is a conceptual perspective view illustrating a method of forming a heat transfer layer for manufacturing a cold pad shown in FIG.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

3 is a perspective view illustrating a cold pad according to an embodiment of the present invention. On the lower side, there is a base provided with an air passage (17) in the form of a thin cushion, and a plurality of integrated cells having different areas, heights and shapes are provided on the base surface.

Each integrated cell space is separated into two cells by the diaphragm. Among the upper and lower cells, a phase change material is filled in a surface layer cell contacting the body to form a phase change material cell 15, and the lower cell is filled with air to form an air cell 25.

A plurality of air passageways 17 are provided in the base. Each air passageway injects air into a plurality of air cells 25 or one air cell 25 distributed in one of several different regions of the base And is connected to draw out air. Of course, when the area of the base is subdivided, one air passage 17 may be divided to inject air or draw air into the air cells 25 in several regions.

The air passageway (17) is gathered at one side (connection portion) of the base and connected in parallel to one of the air tubes (40) extending from the collected portion to the outside of the base. In the terminology, the air passage 17 may be separated from the air tube 40, but the air passage may be an external air tube 40 distributed in the base.

The air tube (40) is connected to an air regulator (50). The air regulator 50 can regulate the air pressure or the air filling amount of the corresponding region through each air tube 40.

The air regulator 50 may be provided with a pneumatic sensor for regulating the air pressure, an air pump or blower motor for withdrawal and injection of air through the air tube 40, a rechargeable battery, A button for selecting, a button for increasing or decreasing air pressure, a display panel for selecting a basic selection and confirming the state of the selection. The operation of the air pump can be done automatically as well as manually depending on the selection. For automatic air conditioning, the air conditioner 50 may be equipped with a controller, microcomputer, or other small computer device for controlling. Such a computer device is provided with a memory, a processor and a basic program so that convenient control and programmed driving can be achieved when using the pad.

For example, it is possible to manually adjust the air pressure for each pad area for each user, store the adjustment state as data in the memory, and designate the state as the mode number. That is, if the air pressure or the air filling amount of each region is adjusted according to the physical condition of the user A, the user A designates and stores the condition condition as the first mode, and when the pad is used again, the user designates the first mode The pad condition can be easily set to the condition suitable for the self and the poultice can be performed.

In this case, when the mode is designated, the processor recognizes the desired air pressure for each area according to the mode stored in the memory, recognizes the air pressure measurement value of the current area, Injects or draws air through the tube. The air cells 25 of the respective regions are controlled to have a constant air pressure or have a constant air filling rate through the air tubes 40 in order. When the desired mode is realized, the air conditioner 50 stops the adjusting operation and enters the standby mode until there is a separate change or instruction.

In addition, the air conditioner 50 can change the body posture in the pumice by changing the mode by time by the program, or can change the concentration area of the pumice, thereby causing the body to have a massage effect simultaneously with the pumice. can do. In particular, for a patient who is lying for a long period of time and whose physical behavior is difficult, the air conditioner 50 may automatically change the body posture periodically while changing the three-dimensional shape of the pad supporting the body, thereby preventing the skin from having a pressure ulcer.

From this point of view, this cold pad can be used for bedsore mat, cushion, wheelchair back.

FIG. 4 shows several important steps of the pad manufacturing method in which the integrated cell of FIG. 3 is formed.

First, prepare a pad lower plate, a pad middle plate, and a pad upper plate in the form of a disk to form a cold pad. Here, the pad top plate is the part that forms the surface that touches the body in the future. Although each pad plate may be formed of different materials, it is easy to mutually melt and adhere, and it is easy to form in a molding method such as vacuum molding or heat press molding by an upper and a lower molding die and air circulation by micropores is effectively prevented It is preferable to use a synthetic resin material which has heat resistance and chemical resistance against the heat generated by the phase change material and which is tough and mechanically not easily damaged by external force.

Then, a molding operation is performed to form an integrated cell space and an air passage 17 in which the phase change material cell 15 and the air cell 25 are formed with respect to the pad upper plate. (At this stage, only the integrated cell space is formed in the pad top plate, and the air passage may not be formed.) The molding operation is performed by using a concave portion (cavity 115) corresponding to the integrated cell space and a concave portion (Not shown) in which a pad upper plate 10 is placed on a first lower molding die 110 having a cavity 117 and a cavity 117, and a projection for filling the cavity is formed by aligning the cavity with the cavity, And the first lower molding die 110 is pressed and adhered to fill the concave portion.

The pad upper plate 10 sandwiched between the first upper molding die and the first lower molding die 110 is provided with an integrated cell space in which the lower phase change material cell 15 is formed and an air passage A wall (an integrated cell wall and an airway wall) protruding downward is formed to form a space. For the molding of a synthetic resin, the mold has a temperature at which the pad top plate can be partially melted and easily deformed.

 At this time, the wall for forming the integrated cell space has a substantially cylindrical sidewall portion and a bottom portion for closing the lower end thereof. The cylindrical sidewall portion has a small diameter portion corresponding to the phase change material cell 15 on the bottom side and a large diameter portion corresponding to the air cell and a tucked portion (stepped portion) is formed at the boundary therebetween . This step portion is not necessarily required. However, if the step portion is present and the sealing by heat press-fusion bonding of the upper portion of the pad and the lower portion of the pad is performed with a certain width in the step portion, .

For the pad mid plate, a molding operation is performed in substantially the same manner as for the pad top plate. However, by the protruding second upper molding die 120 and the cavity-shaped second lower molding die used in this case, a wall defined in the air cell 25 space is formed instead of the integrated cell space in the pad middle plate. The formation of the wall for forming the air passage 27 from the periphery of the pad to the air cell 25 is the same as the formation of the wall for forming the air passage 17 in the pad top plate molding.

The wall for forming the air cell 25 space has a generally cylindrical sidewall portion and a bottom portion that closes the lower end thereof. The bottom surface portion of the bottom surface portion is in the form of being laid on the step portion of the formed pad top plate 10 and the bottom portion is formed of the pad middle plate 20 formed to form the pad of the present invention and the formed pad top plate 10 The air cells and the phase change material cells are separated from each other.

In the above, an example in which the original flat pad upper plate and the pad middle plate are prepared and is formed by sandwiching it between the upper and lower forming molds is considered. However, considering that the pad upper plate and the pad middle plate are thin sheets, And a method in which the mold is formed on the mold with the curvature formed therein by atmospheric pressure). In this case, when forming the pad upper plate, it is also possible to use only the cavity-type first lower molding die 110 having the concave portion formed therein. When molding the pad middle plate, the second upper molding die having the convex- 120 can be formed by using only the resin. In the process of integrally joining the molded pad upper plate 10 and the formed pad middle plate 20, the cavity-shaped first lower molding die 110 is joined to the lower molding die for engagement, (120) may be used as an upper forming mold for engaging.

It is also possible to use various other forming methods such as joining the upper and lower forming molds first, obtaining a pad top plate molded by an injection molding method in which a liquid material is injected into a space between upper and lower forming molds, and a molded pad middle plate.

The bottom of the pad can be prepared in a flat state and a concave portion is formed in the same manner as the forming method of the pad middle plate 20 or the pad top plate 10 at the position facing the air passage of the pad top plate 10 Unlike the embodiment shown in Fig. 4, the third lower molding die 130 is placed so that the molding surface faces upward, and the lower die pad is placed thereon to obtain the lower die pad 30 molded by vacuum molding, , It is also possible to prepare the air duct wall in a state of being convex upward.

In this state, the formed pad upper plate 10, the formed pad middle plate 20 and the formed pad lower plate 30 are combined to form the cold pad of the present invention. In the process, first, the molded pad upper plate 10 is placed in the first lower molding die 110 used for forming the pad upper plate, and the lower space for the phase change material cell 15 of the integrated cell groove Fill the change material. The phase change material may be a variety of materials known in the art depending on the required temperature range, and the phase change material itself is well known, so a detailed description thereof will be omitted.

With regard to the method of filling the phase change material, it may be directly filled in a liquid or jelly-like semi-solid form or in powder form depending on its characteristics and ambient temperature environment, or may be inserted in a separate space with the pocket sealed in a separate pocket , And a porous material such as a sponge.

The grooves for the air cell 25 and the air passageway 27 of the pad middle plate 20 are positioned on the first lower molding die 110 so that the middle pad 20 formed thereon overlaps the formed pad upper plate 10. [ The groove for use is superimposed on the groove for the integrated cell and the groove for the air passage 17 of the pad top plate 10 and the phase change material cell is filled with the phase change material.

When the second upper forming mold 120 is placed on the pad middle plate 20 and the upper pad 10 overlapped with each other and heated and pressed, the pad middle plate and the pad upper plate as a whole are fused to each other, But only in the portion of the phase change material cell 15, the sealed phase change material cell 15 is formed with the phase change material interposed therebetween.

Subsequently, the second upper forming mold 120 is removed, and the lower pad 30 and the third upper forming mold 130 (the third upper forming mold 130 having a curvature capable of forming the air passage) The pad lower plate, the pad middle plate, and the pad upper plate are welded to each other at a flat portion around the air passage 27 and around the air cell 25, thereby completing the air cell 25 and the air passage 27 .

 At this time, one end of each air tube (40) is overlapped with the end of the corresponding air passage (at the connection portion around the pad where the plurality of air passageways (27) are gathered together) The connection between the air tubes 40 and the air passages 27 can be made.

As for the method of joining between the pad upper plate, the pad middle plate and the pad lower plate, the portions constituting the pad may be bonded by the adhesive in addition to the heat press fusion bonding by the molding frame. In addition to the direct conduction method used, a high frequency welding method can be used.

The other end of the air tubes 40 is connected to the air conditioner 50 and the air conditioner 50 is used by injecting air into the air cells 25 of the fomenting pad through the air tubes 40 . The air to be injected into the finished pad is a concept that includes atmospheric air, but includes both nitrogen and other chemically stable gases in general.

5 shows a fomentation pad according to another embodiment of the present invention.

The fomenting pad comprises a heat transfer layer 210 in which a plurality of phase change material cells 215 are filled with a phase change material in a first base and a plurality of air cells 225 in which a heat transfer layer is separately filled with air, And an air conditioner 250 that adjusts the three-dimensional shape of a portion contacting the body by controlling gas inflow and outflow to a plurality of air cells 225.

At this time, in the shape-deformed layer 220, the air cells 225 are divided and distributed in a plurality of regions of the second base, and the air conditioner 250 calculates the air amount of the air cells 225 in the corresponding region And the air cells 225 connected to the same area or the same route (path) are connected to each other to have the same pressure.

In order to form the fomentation pad of the present invention by bonding the heat transfer layer 210 and the shape-deformed layer 220 in an overlapping manner, a joining means for holding the bonding of these layers, such as a snap- And a cover made of a nonwoven fabric or a cloth covering them in a state of being overlapped with each other can be provided.

On the other hand, when these layers are superimposed on one another, the phase change material cell 215 and the air cell 225 may be formed to have the same size in the same position (area), but in a completely different position and size. Also, within the same phase change material cells, and even within the same air cell, the shape and size of individual cells may be the same or different. For example, in the heat transfer layer 210, the phase change material cells are distributed evenly in the same size on the entire surface of the first base, while the air cells in the shape-deformed layer 220 are curved A wall forming the air cell may be formed so that the area and the height of the second base are different from each other according to the position of the second base. In this case, the three-dimensional shape of the portion in contact with the body is controlled by adjusting the air pressure and the air filling amount of the air cells in the shape-deformed layer.

In the second base of the shape-deformed layer 220, a plurality of air passageways (not shown) such as those formed in the pad plates constituting the base of the previous embodiment are formed, the air passageway system is divided, When air is injected through the external air tube 240, the air cells connected to the same air passage system have the same air pressure.

Meanwhile, although not shown here, in the case of a phase change material for a hot pad material that releases heat while the phase change material is changed from a liquid phase to a solid phase, a heater heating wire is disposed in the second base at the time of forming the second base, To the outside of the base so as to be connected to the power source. In such a case, the user can prepare the phase change material filled in the phase change material cells before the fomentation phase into a liquid and easily prepare for the hot fomentation.

Referring to FIGS. 6 and 7, a method of manufacturing the heat transfer layer and the shape-

First, referring to FIG. 6, a method of manufacturing the shape-deformed layer may be performed in substantially the same manner as the method of the embodiment of FIG. That is, the pad plate 223a corresponding to the middle plate of the previous embodiment and the pad plate 223b corresponding to the lower pad are respectively formed by using the forming mold 320, and the molds 320 are overlapped in the forming die 320, The shape-deformed layer can be formed by fusion bonding or bonding by using a molding frame. Forming the air passage in the second base and the air passage forming method in the embodiment of Fig. 4 can be performed in the same manner.

Referring to FIG. 7, the method of manufacturing the heat transfer layer may be similar to the method of manufacturing the shape-deformed layer. For example, a pad plate 213a and a flat pad plate 213b on which a space for a phase change material cell is formed are prepared, respectively, and these are superimposed on the molds 320 and 330, . ≪ / RTI > However, in the heat transfer layer fabrication method, since there is no passage between the air cells of the shape-deformed layer and the air passage 227 of the shape-deformed layer between the phase change material cells 215 ' You just need to adjust it.

Also, the method of filling the phase change material cells with the phase change material may be performed in a manner such that the phase change material is filled in accordance with the foregoing embodiment. That is, the phase change material can be determined according to need, and can be directly filled in a liquid or jelly-like semi-solid or powder form depending on the characteristics of the phase change material and the ambient temperature environment, The pocket may be inserted into the cell space or may be inserted and impregnated with a porous material such as a sponge.

While the present invention has been described with reference to exemplary embodiments, it is to be understood that the invention is not limited to the disclosed exemplary embodiments.

For example, the present invention can be applied to a cold pad using the phase change material of the present invention when transferring a substance such as a living tissue or other objects requiring special temperature and shape protection, have.

In addition, although an embodiment is described focusing on a mode in which an air regulator is combined to regulate an air amount or a pressure of an air cell, an air cell is filled with a separate heat insulating material, thereby suppressing heat transfer in other directions, Do.

That is, those skilled in the art will appreciate that various modifications, additions and substitutions are possible, without departing from the scope and spirit of the invention as disclosed in the accompanying claims.

10: (molded) pad top plate 15, 215: phase change material cell
17, 27, 37: air passage 20: (molded) pad middle plate
25, 225: air cell 30: (molded) pad bottom plate
40: air tube 50: air conditioner
110: first lower molding die 120: second upper molding die
130: third upper forming mold 210: heat transfer layer
220: shape-deformable layer 320, 330, 420, 430: forming mold

Claims (11)

delete delete delete delete delete delete Preparing a pad upper plate, a pad middle plate, a pad lower plate,
A cavity forming a cavity for forming an air passage space serving as a path for supplying air to the integrated cell space and air to the integrated cell space from the outside is formed on the pad upper plate using a first lower molding die of a cavity type, A wall constituting a groove for forming an air passage space corresponding to a lower portion of the integrated cell space and an air passage space serving as a path for supplying air from the outside to the air cell space is formed on a middle plate using a projection- Molding step,
Placing the pad upper plate formed with the integrated cell space in the first lower molding die and placing the pad middle plate in which the air cell space is molded so as to overlap when the integrated cell space and the air cell space are viewed from above, And forming a phase change material cell excluding the air cell space in the integrated cell space by bonding the molded pad upper plate and the molded pad middle plate by pressing the forming die toward the first lower molding die, A method for manufacturing a cold pad using a change material. 8. The method of claim 7,
And filling a space corresponding to the phase change material cell, which is a lower portion of the integrated cell space, with a phase change material before coupling the molded pad upper plate and the formed pad middle plate,
The second upper forming mold is removed to seal the air cell space which is the remaining space of the integrated cell space after the step of joining the formed pad upper plate and the pad middle plate, The method of manufacturing a cold pad according to claim 1, further comprising the step of placing the lower pad formed on the upper body of the upper plate in an overlapping manner and pressing the lower pad with the lower mold. Forming a heat transfer layer in which a plurality of phase change material cells are distributed in a first base,
Forming a shape-deformed layer in which a plurality of air cells are distributed in a second base,
And bonding the heat transfer layer and the shape-deforming layer so as to overlap each other,
The forming of the heat transfer layer may include forming a wall forming a phase change material cell space using a cavity-type lower molding die in a pad upper plate, pressing the lower die plate over the molded upper plate, And sealing the phase change material cell space,
The forming of the shape-deformed layer includes a forming step of forming a wall forming an air cell space and an air passage space by using a cavity-type lower molding die in the pad middle plate, a step of superposing a separate lower pad plate on the molded middle plate, And sealing the air cell space while pressurizing the air cell space with a mold. delete delete

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