KR20100119939A - Vacuum insulator and envelope for vacuum insulator - Google Patents

Abstract

PURPOSE: A vacuum insulator and an outer cover member for the same is provided to maintain the insulation performance of a vacuum insulator by minimizing the inflow of air and to support the load due to the pressure difference of inner and outer cover members. CONSTITUTION: A vacuum insulator comprises a unit vacuum insulator(110) and a second coating member(120). The unit vacuum adiabatic body is composed of porous inner core and a first coating member. Porosity inner core member are installed between the second coating member and the unit vacuum insulator.

Description

VACUUM INSULATOR AND ENVELOPE FOR VACUUM INSULATOR}

The present invention relates to a vacuum insulator and an outer shell material for the vacuum insulator.

Energy consumption from heating and cooling of buildings is the largest part of the home and commercial sector. In OECD countries, heating and cooling account for about 50% of the total energy consumption in the home and commercial sectors. This means that a significant part of the carbon dioxide emissions are due to the heating and cooling of buildings. Given that supply and demand for alternative energy is currently only 1-2% of total energy consumption, and that long-term plans do not exceed 10%, the reduction of heating and cooling energy is the most effective solution to the current energy crisis and carbon emissions. It is an effective solution. Reducing cooling and heating itself to save energy for heating and cooling is not a fundamental solution, and the best solution is to use high-performance insulation that can reduce the energy lost to the outside as much as possible. However, the thermal conductivity of existing insulation remains at a limit of about 30 mW / m · K over the last century. If you want to cut energy consumption in half with current insulation, the thickness of the insulation is so thick that economically viable construction is not possible. Therefore, a heat insulating material that can be applied to existing and new buildings in the form of interior and exterior materials has to be developed, and a vacuum insulator can make it possible. The vacuum insulator makes the interior vacuum and suppresses convection and conduction heat transfer by gas, and exhibits 10 times or more excellent heat insulation effect than polyurethane foam or polystyrene foam, which is a conventional general heat insulator. The vacuum insulator is applied to not only buildings but also to exterior walls of refrigerators, small thermostats, cryogenic industries, etc., as well as an excellent energy saving effect, thereby reducing the space occupied by the insulation, thereby obtaining additional usable space.

In general, the vacuum insulator supports the pressure difference between the inside of the insulator and the external atmospheric pressure, and the inner core (core) for maintaining the shape of the insulator, and the gas blocking for maintaining the vacuum inside the insulator while covering the inner core. It is composed of a gas adsorbent or getter for adsorbing the outer skin of the castle, the residual gas and the gas source inside the heat insulator and maintaining the vacuum for a long time. The inner core should be able to withstand the load due to the pressure difference between the inside and outside of the insulation, and is a porous structure in which air can be easily vented, and is usually a fibrous material such as polyurethane foam, polystyrene foam, glass fiber, powder such as silica and pearlite Ashes have been suggested.

The thermal conductivity of a gas is drastically reduced when the mean free path of the gas molecules is greater than or equal to the size of the pores of the inner core (the distance between the wall and the wall where the gas can collide). Since the mean free path of gas is inversely proportional to the pressure, the lower the pressure or the smaller the size of the pores of the inner core, the less the heat conduction effect of the gas. For example, a polymer foam with pore sizes of several hundred microns would require a degree of vacuum of about 0.01 to 0.1 torr. That is, when the reference pressure required for each inner core material is exceeded, the thermal conductivity increases rapidly and the original performance of the insulation is lost. Therefore, in order to maintain the original thermal insulation performance of the vacuum insulator for a long time (at least 10 years), the degree of vacuum inside the insulation must be maintained at a constant level.

Factors that increase the pressure inside the vacuum insulator include gas permeation through the shell, degassing in the inner core, and residual gases generated during manufacture. Among them, gas permeation through the shell material has the greatest influence on the total pressure increase because it continuously occurs through the heat-sealed polymer layer. In order to reduce gas permeation through the shell material, a laminated film composed of a metal layer and a plastic film layer having a gas barrier property is generally used. Depending on the application conditions, structure and price, polyethylene terephthalate (PET), lowdensity polyethylene (LDPE), aluminum foil or evaporation film, and linear-lowdensity polyethylene (LLDPE) layers are generally laminated, among which LLDPE layer is It is attached to the inner side of aluminum to heat-bond the two sides of the film.

Korean Patent Laid-Open Publication No. 10-1998-078092 among the existing technologies for the outer cover material for the vacuum insulator has been proposed for the construction and manufacturing method of the film composite for vacuum insulation material consisting of a plastic coextruded multilayer film and a metal foil deposition film. . In addition, US Patent Publication US2007 / 0196665 proposes various film lamination structures in order to prevent pin holes caused by damage to the outer cover material from foreign materials. However, there is a problem that such a conventional envelope material does not fundamentally solve the phenomenon of the external gas permeation through the heat-sealed polymer layer. In addition, Korean Laid-Open Patent Publication No. 10-2006-0053143 discloses a double outer shell material to prevent moisture or gaseous components from adhering to the inner core material while the vacuum insulator is being manufactured or during storage of an object being manufactured. Presented. However, this is a dimension in which the outer shell material blocks the inner core material from the outer gas during the manufacturing process, not for the purpose of reducing gas permeation, and the inner outer shell material is brought into contact with each other by the external atmospheric pressure after manufacturing, There is a problem that there is no space to play a buffer role in the gas permeation prevention effect is weak.

Therefore, in order to solve the above problems, the present invention is formed by enclosing the unit vacuum insulator and the porous inner core material installed thereon with a separate outer shell material to form a vacuum insulator having a double structure, thereby minimizing gas permeation. It aims at maintaining the high thermal insulation inherent in a vacuum insulator for a long time by this.

In addition, in the present invention, since a separate inner core is provided between the unit vacuum insulator and the outer shell material, an excess volume is generated, so that the vacuum insulation can reduce the degree of pressure increase inside the outer shell material. The purpose is to provide a sieve.

In addition, the present invention, a plurality of unit vacuum insulators are disposed between the upper and lower plates, a porous filler having a small pore size is installed in the remaining inner space, and the upper and lower plates are wrapped with a separate outer shell material. Since the vacuum insulator of the double structure is formed, the internal pressure increase by gas permeation can be minimized, and the heat insulation performance can be improved. Moreover, since the upper and lower plates are provided between the unit vacuum insulator and the outer shell material, an object of the present invention is to provide a vacuum insulator that can effectively support the load caused by the pressure difference between the outer shell material and the outer shell material.

Moreover, since this invention adhere | attaches only three surfaces by the thermal fusion method, an object of this invention is to provide the outer shell material for vacuum insulation which the fusion length is reduced and gas permeation is reduced by this.

The vacuum insulator of the invention according to claim 1 is a porous inner core member provided between a porous inner core member and a unit vacuum insulator composed of a first shell member which surrounds the porous inner core member and maintains the degree of vacuum therein. It includes a second envelope surrounding the envelope to maintain the degree of vacuum therein.

Therefore, according to the vacuum insulator of the invention according to claim 1, since the unit vacuum insulator and the porous inner core installed thereon are wrapped in a separate outer shell material to form a double-wall vacuum insulator, the gas insulator is minimized. , Can improve the insulation performance. In addition, since a separate inner core is provided between the unit vacuum insulator and the outer envelope, excess volume can be generated to reduce the degree of pressure increase inside the outer envelope.

The vacuum insulator of the invention according to claim 2 is the vacuum insulator according to the invention according to claim 1, further comprising an adsorbent that is provided in a unit vacuum insulator or a predetermined region inside the second shell material to adsorb residual gas.

Therefore, according to the vacuum insulator which is invention of Claim 2, since the adsorbent is contained in it, residual gas can be removed and a vacuum state can be maintained for a long time.

The vacuum insulator of the invention according to claim 3 is the vacuum insulator according to the invention according to claim 1, wherein the porous inner core member is composed of any one of an organic foam, an inorganic fiber material, an inorganic powder, and an artificial structure.

According to the vacuum insulator of the invention according to claim 3, any one of an organic foam, an inorganic fiber material, an inorganic powder, and an artificial structure, which is a material whose thermal conductivity is as small as possible and can withstand loads caused by external atmospheric pressure Used as an inner core.

The vacuum insulator according to claim 4 is provided with a plurality of spaced apart at predetermined intervals between the upper and lower plates, the upper and lower plates, a porous filler is installed therebetween, and wraps the porous inner core and the porous inner core. A unit vacuum insulator made of a first outer cover material for maintaining the degree of vacuum inside, a porous filler provided between the unit vacuum insulator, and a second outer cover material surrounding the upper and lower plates to maintain the degree of vacuum therein; .

Therefore, according to the vacuum insulator of the invention according to claim 4, a plurality of unit vacuum insulators are disposed between the upper and lower plates, a porous filler having a small pore size is installed in the remaining inner space, and the upper and lower plates are Since a vacuum insulator having a double structure is formed by wrapping it in a separate outer shell material, by minimizing gas permeation, heat insulation performance can be improved. In addition, since the upper and lower plates are provided between the unit vacuum insulator and the outer shell member, the load due to the pressure difference between the outer shell member and the outer shell member can be effectively supported.

The vacuum insulator of the invention according to claim 5 is the vacuum insulator according to the invention according to claim 4, which is provided in a predetermined region inside the unit vacuum insulator, or is provided in a predetermined region of the space between the unit vacuum insulators. It further comprises an adsorbent for adsorbing the residual gas.

Therefore, according to the vacuum insulator which is invention of Claim 5, since the adsorbent is contained in it, residual gas can be removed and a vacuum state can be maintained for a long time.

The vacuum insulator of the invention according to claim 6 is the vacuum insulator according to the invention according to claim 4, wherein the upper and lower plates contain a material having a high ratio of tensile strength and thermal conductivity coefficient.

Therefore, according to the vacuum insulator of the invention according to claim 6, by including a material having a high tensile strength and a low thermal conductivity, it supports the pressure difference between the inside of the vacuum insulator and the external atmospheric pressure, and maintains the form of the vacuum insulator for a long time. You can.

The vacuum insulator of the invention according to claim 7 is the vacuum insulator according to the invention according to claim 4, wherein the porous filler is a material of any one of a fiber material, a powder, a foam, and an aluminum laminated film, or at least two or more are mixed. It is a mixture.

Therefore, according to the vacuum insulator of the invention according to claim 7, since the fiber filler, the powder, the foam, the aluminum laminated film, or a mixture thereof is used as the porous filler, conduction heat transfer and radiant heat transfer by the gas can be effectively suppressed. have.

The outer shell material for vacuum insulators which is invention of Claim 8 is formed by folding a shell material in half, and heat-sealing the both side surfaces and the opening part of a folded shell material.

Therefore, according to the outer cover material for vacuum insulators of the invention according to claim 8, since only three surfaces are bonded by the thermal fusion method, the fusion length is reduced, thereby reducing gas permeation.

The outer shell material for vacuum insulators which is invention of Claim 9 is formed by folding a shell material so that both ends may overlap by predetermined width, and heat-sealing the overlapping both ends and the opening part of both sides.

Therefore, according to the outer cover material for the vacuum insulator according to the invention of claim 9, since only three surfaces are bonded by the thermal fusion method, the fusion length is reduced, thereby reducing gas permeation.

As described above, according to the present invention, since the vacuum insulator having a double structure is formed by wrapping the unit vacuum insulator and the porous inner core installed thereon with a separate outer shell material, the vacuum insulation is minimized by minimizing gas permeation. The high insulation performance of the sieve can be maintained for a long time.

In addition, according to the present invention, since a separate inner core is provided between the unit vacuum insulator and the outer shell material, an excess volume is generated to reduce the degree of pressure increase inside the outer shell material.

According to the present invention, a plurality of unit vacuum insulators are disposed between the upper and lower plates, a porous filler having a small pore size is installed in the remaining inner space, and the upper and lower plates are formed as separate outer shell materials. Since a vacuum insulator having a double structure is formed to wrap, the internal pressure increase due to gas permeation can be minimized, and the heat insulating performance can be improved. In addition, since the upper and lower plates are provided between the unit vacuum insulator and the outer shell member, the load due to the pressure difference between the outer shell member and the outer shell member can be effectively supported.

Further, according to the present invention, since only three surfaces are bonded by the thermal fusion method, the fusion length is reduced, thereby reducing gas permeation.

Specific matters other than the problem to be solved, the problem solving means, and the effects of the present invention as described above are included in the following embodiments and the drawings. Advantages and features of the present invention and methods for achieving them will be apparent with reference to the embodiments described below in detail with the accompanying drawings. Like reference numerals refer to like elements throughout.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the accompanying drawings are only described in order to more easily disclose the contents of the present invention, but the scope of the present invention is not limited to the scope of the accompanying drawings that will be readily available to those of ordinary skill in the art. You will know.

1 is a cross-sectional view showing the structure of a vacuum insulator according to a first embodiment of the present invention.

As shown in FIG. 1, the vacuum insulator 100 according to the first embodiment of the present invention includes a unit vacuum insulator 110 including a porous inner core 112 and a first shell 111, and It consists of a second envelope 120 surrounding the porous inner core (130a, 130b) provided between the unit vacuum insulator (110).

The first envelope 111 and the second envelope 120 serve to maintain the degree of vacuum inside each envelope. In addition, the first envelope 111 and the second envelope 120 is made of a metal layer and a polymer film layer having a gas barrier property. For example, the outer cover material is composed of a polyethylene terephthalate (PET) film, a low density polyethylene (LDPE) film, an aluminum foil or a deposition film, a low density polyethylene (LDPE) film, and a linear low density polyethylene (LLDPE) film. Here, the intermediate aluminum layer has a very low gas permeability, thereby preventing the penetration of the outside atmosphere through the surface of the shell material. In addition, the outer cover material, in consideration of durability may be added to the nylon (nylon) or CPP (Casting Polypropylene) layer.

The porous inner core members 112, 130a, and 130b are provided inside the first envelope 111 and between the first envelope 111 and the second envelope 120. In particular, the porous inner cores 130a and 130b installed between the first outer shell material 111 and the second outer shell material 120 generate an excess space to reduce the pressure increase degree inside the second outer shell material 120. Play a role. At this time, the porous inner core (112, 130a, 130b), its thermal conductivity should be as small as possible, it must be able to withstand the load by the external atmospheric pressure. As the porous inner cores 112, 130a, 130b used in the vacuum insulator according to the present invention, organic foams (polyurethane foam, polystyrene foam, etc.), fiber materials (glass fibers, mineral wool, etc.), inorganic powders (fumed) Silica (SiO 2), perlite powder, etc.) and artificial structures (lattice beam structures, honeycomb structures, etc.) may be applied.

The adsorbent 113 is installed in a predetermined region inside the unit vacuum insulator 100 or the second envelope 120 to adsorb residual gas in the unit vacuum insulator 100 or the second envelope 120. do. That is, the adsorbent 113 may be installed only inside the unit vacuum insulator 110 or both outside thereof. The adsorbent 113 plays an important role in adsorbing the residual gas to maintain a long-term vacuum state, also referred to as a getter.

According to the vacuum insulator 100 according to the first embodiment of the present invention shown in Figure 1, the outer surface of the first shell material 111 through the heat-sealed portion located at the edge of the second shell material 120 at atmospheric pressure It is possible to reduce the amount of gas permeated to the inside.

In more detail, the pressure increase rate of the internal pressure of the second envelope 120 generated by the gas permeated through the heat fusion around the second envelope 120 from the outside of the vacuum insulator is expressed by Equation 1 below. do.

[Equation 1]

Where P ₀ is the pressure inside the second envelope, t is the time, R _u is the universal gas constant, T is the temperature, V ₀ is the internal volume, K _edge is the gas permeability constant, L ₀ is the circumferential length of the thermal weld zone, h ₀ is the thickness of the thermal weld, w ₀ is the width of the thermal weld, P _{0 , atm} Is the pressure outside the shell material.

As shown in Equation 1, it can be seen that as the V ₀ is smaller, the pressure increase with time becomes larger. Therefore, the vacuum insulator according to the first embodiment of the present invention is provided with additional porous inner cores 130a and 130b to form V ₀ separately.

Similarly, the pressure change rate of the unit vacuum insulator 100 is expressed as Equation 2 below in the form as shown in Equation 1 above.

[Equation 2]

That is, the unit of the pressure increase rate of the vacuum heat insulating material 100, the internal pressure of the second outer skin material (120) P _o It is proportional to the difference between the internal pressure P _i of the first shell member 111 and the. In addition, since the value of P _o is small, the pressure increase rate due to gas permeation in the unit vacuum insulator 100 is substantially reduced.

On the other hand, Table 1 shows an experimental example of the pressure increase for gas permeation, the data showing the pressure increase due to gas permeation after 1 year, 5 years, 10 years for a 30cm × 30cm × 1cm vacuum insulator . Here, the permeate gas only considers H ₂ , O ₂ , CO ₂ , N ₂ , H ₂ O.

TABLE 1

Single jacket Double skin Inside the first envelope Inside the second envelope Vacuum Insulator Size (cm) 30 × 30 × 1 30 × 30 × 1 30 × 30 × 1 Internal effective volume (cm ³ ) 720 720 720 Heat Fusion Length (cm) 124 124 128 Heat Fusion Height (cm) 0.012 0.012 0.012 Thermal weld width (cm) One One One Pressure increase after 1 year (torr) 1.136 0.015 1.172 Pressure increase after 5 years (torr) 5.413 0.320 5.577 Pressure increase after 10 years (torr) 10.25 1.095 10.54

Here, it can be seen that 10 years later, the double shell material is about 1/10 smaller than the single shell material.

2 is a cross-sectional view showing the structure of a vacuum insulator according to a second embodiment of the present invention.

As shown in FIG. 2, the vacuum insulator according to the second embodiment of the present invention includes a plurality of upper and lower plates 230a and 230b, a porous inner core 212 and a first shell 211. The unit vacuum insulator 210, a porous filler 240 installed between the unit vacuum insulator 210, and a second envelope 220 surrounding the upper and lower plates 230a and 230b.

The upper and lower plates 230a and 230b preferably use a material having a high ratio of tensile strength and thermal conductivity coefficient. That is, it is preferable that the upper and lower plates 230a and 230b have a high tensile strength and low thermal conductivity. For example, a material such as polycarbonate or polyimide may be used.

The plurality of unit vacuum insulators 210 are disposed at predetermined intervals to withstand the load due to the pressure difference existing between the inside and the outside of the second envelope material 220. The unit vacuum insulator 210 may be inserted with at least a small number of vacuum insulators at a level where the upper and lower plates 230a and 230b are not deformed. The empty space between the unit vacuum insulator 210 fills the porous filler 240 having a pore size of 100 μm or less. This is to reduce radiant heat transfer as well as to reduce heat conduction by gas. The porous filler 240 may be a fiber, powder or polymer foam, an aluminum film and a mixture of the above materials. Here, it is preferable that an aluminum film is 10 micrometers or less. In this case, the materials constituting the porous filler 240 is preferably used having a pore size of less than 100um.

According to the vacuum insulator according to the present invention shown in Figure 2, the load due to the internal and external pressure difference of the second shell material 220 is supported by a plurality of unit vacuum insulator 210, unit vacuum insulator 210 Porous filler 240 is filled in the empty space between, and serves to reduce the thermal conductivity phenomenon and radiant heat transfer by the gas. In addition, the pressure increase due to gas permeation of the unit vacuum insulator is reduced.

Figure 3 is a top view showing the structure of a three-sided heat-sealing outer shell material for a vacuum insulator according to a third embodiment of the present invention.

As shown in FIG. 3, the three-sided heat-sealing outer shell material for the vacuum insulator according to the third embodiment of the present invention may be folded in half to have a predetermined size of the outer shell material, and both sides 310 and the opening 320 of the folded outer shell material. It is formed by thermal fusion.

In more detail, the three-sided heat-sealing outer shell material for the vacuum insulator according to the third embodiment of the present invention first folds the outer fabric of a predetermined size in half. Then, both sides of the bent portion 300 is thermally fused 310, and then the inner core and the adsorbent are inserted into the opening 320 of the shell material. Thereafter, after the exhaust in the vacuum chamber, the opening 320 is heat-sealed and finally sealed.

Figure 4 is a top view showing the structure of a three-sided heat-sealing outer shell material for a vacuum insulator according to a fourth embodiment of the present invention.

As shown in Figure 4, the three-sided heat-sealing outer shell material for the vacuum insulator according to the fourth embodiment of the present invention, the outer shell material is folded so that both ends overlap a predetermined width, the overlapping both ends 410 and both The side openings 400 and 420 are formed by thermal fusion.

In more detail, the three-sided heat-sealing outer cover material for the vacuum insulator according to the fourth embodiment of the present invention, after folding the outer material to overlap a predetermined width, and heat-sealed both ends 410. Then, after fused both ends 410 are positioned at the center of the outer cover material, one surface of the opening 420 is thermally fused. Then, the inner core and the adsorbent are inserted through the opening 400 which is the other surface. Then, after evacuating in the vacuum chamber, the final seal completes the three-sided heat-sealed vacuum insulator.

The three-sided heat-sealing outer shell material for the vacuum insulator according to the fourth embodiment of the present invention serves to reduce the total permeability by reducing the length of the heat-sealed portion than in the case of the four-sided heat-sealed outer shell material (Equations 1 and 2) Reference).

According to the three-sided heat-sealing outer shell material for the vacuum insulator according to the present invention shown in Figures 3 and 4, by applying the outer shell material fusion only three sides in the existing four-side welding, heat fusion in the equations (1) and (2) Length of the perimeter L ₀ , By reducing L _i , gas permeation can be reduced.

As described above, according to the present invention, the unit vacuum insulator and the porous filler installed thereon may be wrapped in a separate outer envelope to minimize gas permeation to the unit vacuum insulator and maintain high insulation performance for a long time. In addition, by installing a separate porous inner core between the unit vacuum insulator and the outer shell material, it is possible to create an excess volume to reduce the pressure increase in the outer shell material. Also, a plurality of unit vacuum insulators are disposed between the upper and lower plates, a porous filler having a small pore size is installed in the remaining inner space, and the upper and lower plates are wrapped with a separate outer shell material to form a unit vacuum insulator. By minimizing the gas permeation of the unit, not only the unit vacuum insulator can withstand the load due to the external atmospheric pressure, but also the heat conduction effect by the gas can be reduced. Three-sided thermal fusion can also be used to reduce the fusion length and reduce gas permeation.

As such, the technical configuration of the present invention described above can be understood by those skilled in the art that the present invention can be implemented in other specific forms without changing the technical spirit or essential features of the present invention.

Therefore, the exemplary embodiments described above are to be understood as illustrative and not restrictive in all respects, and the scope of the present invention is indicated by the following claims rather than the detailed description, and the meaning and scope of the claims and their All changes or modifications derived from equivalent concepts should be construed as being included in the scope of the present invention.

1 is a cross-sectional view showing the structure of a vacuum insulator according to a first embodiment of the present invention.

2 is a cross-sectional view showing the structure of a vacuum insulator according to a second embodiment of the present invention.

Figure 3 is a top view showing the structure of a three-sided heat-sealing outer shell material for a vacuum insulator according to a third embodiment of the present invention.

Figure 4 is a top view showing the structure of a three-sided heat-sealing outer shell material for a vacuum insulator according to a fourth embodiment of the present invention.

Claims (9)

A unit vacuum insulator composed of a porous inner core and a first outer shell covering the porous inner core to maintain a degree of vacuum therein; And A second envelope member which surrounds the porous inner core member provided between the unit vacuum insulator and maintains a degree of vacuum therein; Including, vacuum insulator. The method of claim 1, An adsorbent which is installed in a predetermined region inside the unit vacuum insulator or the second envelope and adsorbs residual gas. Further comprising, vacuum insulator. The method of claim 1, The porous inner core is composed of any one of an organic foam, an inorganic fiber material, an inorganic powder, an artificial structure structure, Vacuum insulator. Upper and lower plates; A plurality of units spaced apart at predetermined intervals between the upper and lower plates, porous fillers are installed therebetween, and a unit made of a porous inner core and a first outer shell covering the porous inner core to maintain a degree of vacuum therein. Vacuum insulators; And A porous filler disposed between the unit vacuum insulator and a second envelope material surrounding the upper and lower plates to maintain a degree of vacuum therein; Including, vacuum insulator. The method of claim 4, wherein An adsorbent which is provided in a predetermined region inside the unit vacuum insulator, or is installed in a predetermined region of the space between the unit vacuum insulators to adsorb residual gas. Further comprising, vacuum insulator. The method of claim 4, wherein The upper and lower plates include a material having a high ratio of tensile strength and thermal conductivity coefficient, Vacuum insulator. The method of claim 4, wherein The porous filler is a material of any one of fiber, powder, polymer foam, aluminum film, or a mixture of at least two, Jacketed material for vacuum insulators. An outer shell material for vacuum insulators formed by folding the outer shell material in half and thermally fusion bonding both sides and the openings of the folded outer shell material. An outer shell material for a vacuum insulator formed by folding the outer shell material so that both ends thereof overlap each other with a predetermined width, and heat-sealing the overlapping both end portions and both side opening portions.

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