JP2013036595A - Vacuum heat insulating material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vacuum heat insulating material that uses an organic fiber as a core material to suppress the deterioration of a working environment caused by the dissipation of glass fibers when used as the core material, forms a slit in the core material to improve breakage resistance of the organic fibers, and that suppresses the tangle of the organic fibers around a metal, which is a recycled recovery material, or filter clogging caused by the flocculation of the organic fibers.SOLUTION: The vacuum heat insulating material 1 includes the core material 2 including an organic fiber sheet and a packing material 6 having gas barrier properties and storing the core material 2 to be vacuum sealed. The slit is formed on the organic fiber sheet so that the organic fibers are longitudinally separated. A supporting material 5 is stored in the packaging material 6 to be stacked on one surface in a thickness direction of the core material 2.

Description

  The present invention relates to a vacuum heat insulating material used for heat insulating materials such as a refrigerator, a vending machine, a cold box, a cold car, and a hot water storage tank.

  Conventionally, many vacuum heat insulating materials having excellent heat insulating properties are used in refrigerators, vending machines, cold storage boxes, cold storage vehicles, hot water storage hot water storage tanks, and the like. Generally, the vacuum heat insulating material has a structure in which a core material is filled in a jacket material made of a gas-barrier metal-deposited film, and the inside thereof is decompressed and sealed. And the heat insulation, productivity, and handleability of a vacuum heat insulating material are greatly influenced by the core material.

  In the first conventional vacuum heat insulating material, a filling body (core material) formed by laminating used papers into a rectangular flat plate shape is stored in a bag-shaped outer shell (outer covering material) made of a gas barrier film. After the air inside the outer shell is discharged, the outer shell is hermetically sealed (see, for example, Patent Document 1). The filler is provided with a substantially cross-shaped cut extending in the direction of the used paper and penetrating through the laminate, increasing the exhaust efficiency when exhausting the air inside the outer shell, The evacuation time was shortened.

However, in recent years, demands for vacuum heat insulating materials have been diversified, and higher performance vacuum heat insulating materials have been demanded. Therefore, a second conventional technique comprising: a core material made of a glass fiber aggregate that is superior in heat insulation performance compared to waste paper; a reinforcing material laminated on at least one surface of the core material; and a jacket material having gas barrier properties. The vacuum heat insulating material of this was proposed (for example, refer patent document 2).
However, in the second conventional vacuum heat insulating material, since the glass fiber aggregate is used as the core material, when the outer cover material is opened at the time of recycling, the glass fiber aggregate is scattered and the environmental load increases. There was a problem.

  In view of such a situation, a third conventional vacuum heat insulating material composed of a core material composed of a sheet-like fiber assembly made of polyester fibers and an outer envelope having gas barrier properties has been proposed (for example, (See Patent Document 3).

Japanese Utility Model Publication No. 62-156793 JP 2002-310384 A JP 2006-29505 A

  In the 3rd conventional vacuum heat insulating material, since the core material is comprised with the sheet-like fiber assembly which consists of polyester fiber, the deterioration of the working environment by scattering of glass fiber by using glass fiber for a core material is suppressed. be able to. However, since the organic material is a fiber assembly, the core material is difficult to break. Thus, for example, when a refrigerator or the like equipped with the vacuum heat insulating material is thrown into a crusher having a rotary blade to extract and recycle a metal such as iron, the core material cannot be cut off with the rotary blade, and the fiber The organic material is stretched, increasing in volume and becoming cottony. Then, the organic material that has become cottony gets entangled with the metal that is recycled, and the quality of the recycled product is reduced, or the organic material adheres to the filter that separates the crushed metal, causing clogging. Problems occurred.

  The present invention has been made to solve such a problem, and uses organic fibers as a core material, suppresses deterioration of the working environment due to the use of glass fibers as a core material, and cuts. To obtain a vacuum heat insulating material that can be formed on the core material to improve the difficulty of breaking the organic fibers, and to prevent entanglement of the metal and the clogging of the filter, which are recycled materials resulting from the cotton formation of the organic fibers With the goal.

  The vacuum heat insulating material according to the present invention has a core material made of an organic fiber sheet, and a packaging material having gas barrier properties and containing the core material and vacuum-sealed, and the slit has a length of the organic fiber. It is formed on the organic fiber sheet so as to be divided in the direction, and a support material is stacked on at least one surface in the thickness direction of the core material and stored in the packaging material.

According to this invention, since the core material is composed of the organic fiber sheet, it is possible to suppress the deterioration of the working environment due to the scattering of the glass fiber by using the glass fiber as the core material.
Moreover, since the slit is formed in the organic fiber sheet so as to divide the organic fiber in the length direction, the difficulty of breaking the organic fiber is improved. Therefore, even if vacuum heat insulating material is put into the crusher, organic fiber fluffing can be suppressed, and entanglement of metal, which is a recycled material resulting from organic fiber fluffing, and filter clogging can be suppressed. Recyclability is improved.
Further, since the core material is supported by the support material and inserted into the packaging material, the support material supports the organic fiber sheet that is formed to be separated or easily bent so that assembly workability is improved. Enhanced.

It is sectional drawing which shows the vacuum heat insulating material which concerns on Embodiment 1 of this invention. It is a disassembled perspective view explaining the structure of the core material and support material in the vacuum heat insulating material which concerns on Embodiment 1 of this invention. It is a figure explaining the manufacturing method of the core material used for the vacuum heat insulating material which concerns on Embodiment 1 of this invention. It is a figure explaining the slit arrangement | sequence formed in the organic fiber sheet used for the vacuum heat insulating material which concerns on Embodiment 1 of this invention. It is sectional drawing which shows the vacuum heat insulating material which concerns on Embodiment 2 of this invention. It is a figure which shows the result of having evaluated the recyclability and assembly workability | operativity of the vacuum heat insulating material by this invention.

  Hereinafter, preferred embodiments of the vacuum heat insulating material of the present invention will be described with reference to the drawings.

Embodiment 1 FIG.
FIG. 1 is a sectional view showing a vacuum heat insulating material according to Embodiment 1 of the present invention, and FIG. 2 is an exploded perspective view for explaining the configuration of a core material and a support material in the vacuum heat insulating material according to Embodiment 1 of the present invention. is there.

  1 and 2, a vacuum heat insulating material 1 includes a core material 2 formed by laminating a predetermined number of organic fiber sheets 3 formed by slitting a resin fiber sheet, and the thickness direction of the core material 2. A support material 5 disposed to overlap at least one surface of the substrate, and a packaging material 6 that encloses a laminated body of the core material 2 and the support material 5 and exhausts air inside, and then is hermetically sealed. It is equipped with. Here, the thickness direction of the core material 2 is the thickness direction of the organic fiber sheet 3.

  Here, the organic fiber sheet 3 is made of a sheet of organic fiber obtained by fiberizing a resin material such as polyethylene terephthalate, polystyrene, polycarbonate, polypropylene, or polyethylene, and slit processing is performed to improve shearing properties. Is done. In addition, as a spinning / sheeting method, a spunbond method, a chemical bond method, a needle punch method, or the like is used.

  Factors affecting the thermal conductivity of the organic fiber sheet 3 include solid thermal conductivity due to contact between fibers and gaseous thermal conductivity due to voids between the fibers. When the fiber diameter of the organic fiber is less than 9 μm, the contact area between the fibers is small, but the fiber strength is small, and when vacuum sealing is performed, the fiber is bent and the porosity is decreased. Conductivity increases. On the other hand, when the fiber diameter of the organic fiber is larger than 25 μm, although the fiber strength is increased, the fiber cross-sectional area is increased, so that the solid heat conduction amount of the fiber itself is increased. From these facts, in order to reduce the contact area between the fibers to reduce the solid thermal conductivity, and to refine the voids between the fibers to reduce the gas thermal conductivity to obtain excellent heat insulation performance, the fiber diameter It is preferable to use resin fibers having a distribution peak of 9 μm or more and 25 μm or less.

  The support material 5 is not particularly limited as long as it has a tensile strength capable of supporting the organic fiber sheet 3 whose strength has been reduced by slitting, but the thickness is thin, the surface property is good, and the thermal conductivity is small. It should be cheap, have good stability and good crushability. For the support material 5, for example, an inorganic fiber sheet is used. As the material for the inorganic fiber sheet, glass fiber, ceramic fiber, rock wool, or the like can be used. Examples of the glass fiber sheet include a glass fiber sheet obtained by making a sheet of glass fiber by a wet method and a glass fiber sheet prepared by a dry method using a binder.

  When an inorganic fiber sheet is used as the support material 5, the porosity in the sealed state by discharging the air inside the packaging material 6 is 80% or more and 97% or less, preferably 85% or more and 97% or less. It is good. Thus, the support material 5 maintains a high porosity after sealing, whereby the heat conductivity of the support material 5 itself is reduced, and a decrease in heat insulation performance per thickness of the vacuum heat insulating material 1 can be suppressed. At this time, if the thermal conductivity of the support material 5 is equal to or lower than the thermal conductivity of the organic fiber sheet 3, in order to obtain heat insulation performance equivalent to the vacuum heat insulation material 1 before the support material 5 is inserted, The thickness does not increase.

  When the tensile strength of the support material 5 is less than 1 N / 25 mm, the support material 5 is placed on the core material 2 which is a laminate of the slit organic fiber sheet 3 and inserted into the packaging material 6. 3 cannot be supported, and the organic fiber sheet 3 falls apart, and the assembly workability of the vacuum heat insulating material 1 is lowered. Therefore, the tensile strength of the support member 5 is preferably 1 N / 25 mm or more (preferably 2 N / 25 mm or more).

  A test piece having a width of 25 mm and a length of 120 mm or more was cut out from the support material 5, the test piece was held by a Tensilon tensile tester at a chuck interval of 100 mm, pulled at a speed of 100 mm / min, and the maximum load value was measured. The measured maximum load value was taken as the tensile strength of the support material 5.

  The packaging material 6 is not particularly limited as long as it has a gas barrier property and can maintain the inside in a reduced pressure state, but a material that can be heat-sealed is preferable. For the packaging material 6, for example, a laminate material having a four-layer structure in which a protective layer, a gas barrier layer, a gas barrier layer, and a heat sealing layer are stacked in this order from the outermost layer can be used. As the protective layer, a polyethylene terephthalate film, a polypropylene film, a nylon film, or the like is used. As the gas barrier layer, a metal foil such as stainless steel or aluminum, a metal vapor deposition film, or the like is used. As a metal vapor deposition film, what vapor-deposited metals, such as aluminum, on resin films, such as a polyethylene terephthalate film, an ethylene-vinyl alcohol copolymer film, a polyethylene naphthalate film, is used. As the heat sealing layer, a low density polyethylene film, a high density polyethylene film, an unstretched polypropylene film, or the like is used.

  Next, a method for producing the slit-processed organic fiber sheet 3 will be described with reference to FIG.

  The production line of the slit-processed organic fiber sheet 3 includes a tank 8 into which resin pellets 7 serving as organic fiber materials are charged, and a nozzle 9 from which a melt of the resin pellets 7 heated and melted in the tank 8 is extruded. And a blower 10 for cooling the organic fiber extruded from the nozzle 9, an ejector 11 for stretching the cooled organic fiber to a desired fiber diameter, and collecting the organic fiber stretched by the ejector 11 to obtain a desired The accumulation conveyor 12 whose speed is controlled so as to have a thickness of 1, the pressure roll 13 for heating and welding the organic fibers accumulated by the accumulation conveyor 12 to form a sheet, and the organic fiber sheet formed into a sheet by the pressure roll 13 3 and a slit roll 14 that performs slit processing.

  First, the resin pellet 7 is supplied to the tank 8 and heated and melted. Then, the melted resin pellet 7 is extruded and spun from a nozzle 9 by a gear pump (not shown). The organic fiber pushed out from the nozzle 9 is cooled by the blower 10 and then sucked into the ejector 11 and drawn so that the peak of the fiber diameter distribution is 9 μm or more and 25 μm or less. The stretched organic fibers are accumulated on the accumulation conveyor 12 so as to have a predetermined thickness. The accumulated organic fibers are heat-welded and compressed by the pressure roll 13 and formed into the organic fiber sheet 3. The formed organic fiber sheet 3 is slit by a slit roll 14. A plurality of the organic fiber sheets 3 subjected to the slit processing are laminated so as to have a predetermined thickness, cut into a predetermined size, and become the core material 2.

  The core material 2 thus produced is dried and then supported by a support material 5 stacked on one surface in the thickness direction of the core material 2 and inserted into a packaging material 6 formed in a bag shape together with the support material 5. . Then, the air inside the packaging material 6 is exhausted, the opening of the packaging material 6 is heat-sealed, and the vacuum heat insulating material 1 is produced.

  Here, for example, when the coefficient of static friction of an organic fiber sheet produced by forming a sheet of organic fiber obtained by forming a fiber of polyethylene terephthalate resin was measured, it was 0.9. Therefore, when a support material having a static friction coefficient of less than 0.9 is used, the workability of inserting the support material over the core material and inserting it into the package is improved over the workability of inserting the core material alone into the package. In addition, when a support having a static friction coefficient of 0.1 or less is used, the core material is easily slid off from the support material when the support material is inserted into the package by overlapping the support material, and the support material is used as the core material. It turned out that the workability | operativity which inserts in a package in piles falls rather than the workability | operativity which inserts a core material single-piece into a package. Thus, it is preferable to make the static friction coefficient of a support material smaller than the static friction coefficient of an organic fiber sheet, and larger than 0.1 from a viewpoint of improving the workability | operativity which inserts a support material on a core material in a package.

  A support material having a static friction coefficient smaller than that of an organic fiber sheet and having a static friction coefficient greater than 0.1 supports a release agent having a static friction coefficient smaller than that of an organic fiber sheet and greater than 0.1. What is necessary is just to apply | coat to a material. Further, the support material has a two-layer structure of a core material support layer having a tensile strength of 1 N / 25 mm or more and a low friction layer having a static friction coefficient smaller than that of the organic fiber sheet and greater than 0.1. Good. In this case, the support material is stacked on the core material with the core material support layer facing the core material.

Next, the slit arrangement formed in the organic fiber sheet by slit processing will be described with reference to FIG. In FIG. 4, the arrow A indicates the winding direction of the organic fiber sheet 3.
The slit 4 has a slit length direction orthogonal to the direction of arrow A, each having a predetermined length l, a predetermined interval d in the direction orthogonal to the direction of arrow A, and in the direction of arrow A. A plurality of organic fiber sheets 3 are formed at a predetermined pitch p so as to penetrate the organic fiber sheet 3 in the thickness direction. Since the organic fiber sheet 3 is random in the length direction of the organic fiber, the organic fiber is divided in the length direction by this slit processing.

  The shape, number, and arrangement of the slits 4 are not particularly limited, but the slits 4 are formed so that the elongation rate at the time of complete breakage of the slit organic fiber sheet 3 is 200% or less (preferably 100% or less). It is important to form. In other words, when the elongation rate at the time of complete breakage of the slit organic fiber sheet 3 exceeds 200%, the organic fibers are stretched to form cotton when crushed with a rotary blade, and entangled with the metal that is the recycled recovered material. There is a problem that organic fibers adhere to a filter that lowers the quality as a recycled product or separates crushed metal, thereby causing clogging. For example, the slit length l is 3 mm to 500 mm (preferably 3 mm to 150 mm), the slit interval d is 0.2 mm to 100 mm (preferably 0.2 mm to 50 mm), and the slit pitch p Is preferably 3 mm or more and 200 mm or less (preferably 3 mm or more and 50 mm or less). Further, a slit may be formed in the direction of arrow A to form a cross shape.

  A test piece having a width of 25 mm and a length of 120 mm or more was cut out from the organic fiber sheet 3, and the test piece was held by a Tensilon tensile tester at a chuck interval of 100 mm, pulled at a speed of 100 mm / min, and from the beginning of applying a load. The elongation percentage of the test piece up to the time of breakage was measured, and the measured elongation percentage of the test piece was taken as the elongation percentage of the organic fiber sheet 3 at the time of complete breakage.

  According to this Embodiment 1, since the organic fiber sheet 3 is laminated | stacked and it is set as the core material 2, the deterioration of the working environment by scattering of glass fiber by using glass fiber for a core material can be suppressed.

Moreover, since the slit process is given to the organic fiber sheet 3, an organic fiber is parted in a length direction and the difficulty of fracture | rupture of an organic fiber is improved. Therefore, even if vacuum heat insulating material is put into the crusher, organic fiber fluffing can be suppressed, and entanglement of metal, which is a recycled material resulting from organic fiber fluffing, and filter clogging can be suppressed. Recyclability is improved.
Further, since the core material 2 is supported by the support material 5 stacked on one surface in the thickness direction and is inserted into the packaging material 6, the organic fiber sheet 3 which has been subjected to slit processing and has reduced rigidity falls apart or bends. Assembling workability is improved.

  In Embodiment 1 described above, only the core material in which the organic fiber sheets are laminated is put into the packaging material to obtain a vacuum heat insulating material having excellent heat insulating properties. However, the vacuum due to gas intrusion from the atmosphere over time is obtained. In order to suppress an increase in thermal conductivity due to a decrease in temperature, physical adsorbents such as synthetic zeolite, activated carbon, activated alumina and silica gel, and chemical adsorbents such as oxides and hydroxides of alkali metals and alkaline earth metals May be used to adsorb the invading gas from the outside.

In the first embodiment, the core material drying step is included prior to the packaging material sealing step, but the core material drying step may be omitted.
In the first embodiment, the support material is stacked on one surface in the thickness direction of the core material. However, the support material may be stacked on both surfaces in the thickness direction of the core material.
In the first embodiment, the core material is configured by stacking organic fiber sheets. However, if the organic fiber sheet can be formed to a predetermined thickness, the core material is configured by one organic fiber sheet. May be.

Embodiment 2. FIG.
FIG. 5 is a sectional view showing a vacuum heat insulating material according to Embodiment 2 of the present invention.

In FIG. 5, the vacuum heat insulating material 1 </ b> A is wound around the core material 2 so as to cover both the core material 2 configured by laminating a predetermined number of organic fiber sheets 3 subjected to slit processing and the thickness direction of the core material 2. 5A, and a packaging material 6 that is hermetically sealed after the core material 2 around which the support material 5A is wound is contained and the internal air is discharged.
The second embodiment is configured in the same manner as in the first embodiment except that the support material 5A is wound around the core material 2 so as to cover both surfaces of the core material 2 in the thickness direction.

  Also in the second embodiment, the support material 5A has a tensile strength capable of supporting the organic fiber sheet 3 whose strength has been reduced by slitting, that is, a tensile strength of 1 N / 25 mm or more, a thin thickness, and a surface property. It is good that the thermal conductivity is small, inexpensive, stable, and friable. In the second embodiment, since the support material 5A is wound around the core material 2 so as to cover both surfaces in the thickness direction of the core material 2, a resin film such as polyethylene terephthalate, polyethylene, or polypropylene is used as the support material 5A. Used.

  Also in this Embodiment 2, since the organic fiber sheet 3 is slitted, even if the vacuum heat insulating material 1A is put into the crusher, the organic fiber can be prevented from becoming cotton. Further, since the support material 5A is wound around the core material 2 so as to cover both surfaces of the core material 2 in the thickness direction, the organic fiber sheet 3 may fall apart when the core material 2 is inserted into the packaging material 6. , It won't bend.

  Here, FIG. 6 shows the results of producing a vacuum heat insulating material by changing the elongation rate of the organic fiber sheet and the tensile strength of the support material, and evaluating recyclability and assembly workability. In addition, recyclability evaluated whether the organic fiber became cotton-like after throwing the vacuum heat insulating material 1 into the crusher. The assembly workability evaluated whether the core material was broken or whether the core material was bent when the support material was stacked on the core material, which is a laminate of organic fiber sheets, and inserted into the packaging material. .

Example 1.
The organic fiber sheet is made of polyethylene terephthalate resin as a material, and the organic fiber having a fiber diameter distribution peak of 14 μm is accumulated by the above-mentioned spunbond method, and the accumulated organic fiber is heated and melted and compressed to obtain a thickness. It was made into a sheet so as to be 0.1 mm. Then, 200 organic fiber sheets were laminated and cut into a size of 500 mm × 1500 mm. A slit (perforation) having a slit length l of 4 mm, a slit interval d of 0.5 mm, and a slit pitch p of 6 mm is wound on the cut organic fiber sheet laminate. The core material was formed so as to be orthogonal to the direction. The elongation at the time of complete breakage of this organic fiber sheet was 100%.

As the support material, a glass fiber sheet which was made into a sheet by a wet method was used. The glass fiber sheet was cut into the same size as the organic fiber sheet, the fiber diameter distribution had a peak at 4 μm, the thickness was 1 mm, and the tensile strength was 3 N / 25 mm.
The packaging material is heat-sealed with four layers of nylon (protective layer), aluminum-deposited polyethylene terephthalate (gas barrier layer), aluminum foil (gas barrier layer), and low-density polyethylene (thermal fusion layer) in this order from the outermost layer. And formed into a bag shape.
And after inserting the support material on one side in the thickness direction of the core material and inserting it into the packaging material and drying it at 90 ° C. for several hours, it is exhausted so that the internal pressure of the packaging material becomes a vacuum degree of about 1 to 10 Pa, The opening of the packaging material was heat sealed and sealed to produce a vacuum heat insulating material.

Example 2
200 organic fiber sheets, each having a slit length l of 4 mm, a slit interval d of 1.5 mm, and a slit pitch p of 6 mm formed so that the slit length direction is perpendicular to the winding direction of the organic fiber sheet, are laminated. And it was set as the core material. The elongation at the time of complete breakage of this organic fiber sheet was 200%. The other materials were the same as in Example 1.

Example 3
As the support material, a glass fiber sheet having a fiber diameter distribution with a peak at 4 μm, a thickness of 0.3 mm, and a tensile strength of 1 N / 25 mm was used. The other materials were the same as in Example 1.

Example 4
As the support material, a polyethylene terephthalate film having a thickness of 50 μm was used. The tensile strength of the support material was 70 N / 25 mm. And the support material was wound around the core material so that both surfaces of the thickness direction of a core material might be covered, and it inserted in the packaging material. The other materials were the same as in Example 1.

Comparative Example 1
200 organic fiber sheets, each having a slit length l of 4 mm, a slit interval d of 2 mm, and a slit pitch p of 6 mm, formed so that the slit length direction is perpendicular to the winding direction of the organic fiber sheet, are laminated. The core material was used. The elongation at the time of complete breakage of this organic fiber sheet was 250%. The other materials were the same as in Example 1.

Comparative Example 2
As the support material, a glass fiber sheet having a fiber diameter distribution with a peak at 4 μm, a thickness of 0.16 mm, and a tensile strength of 0.5 N / 25 mm was used. The other materials were the same as in Example 1.

In Examples 1 to 4 and Comparative Example 1, the assembly workability was good. That is, when a support material is stacked on a laminate of organic fiber sheets or wound and inserted into a packaging material, the laminate of organic fiber sheets does not fall apart or bend.
However, in Comparative Example 2, when the support material is stacked on the laminate of the organic fiber sheet and inserted into the packaging material, the laminate of the organic fiber sheet and the support material are separated, and workability to be inserted into the packaging material is deteriorated. did.

Examples 1-4 and Comparative Example 2 had good recyclability. That is, when the vacuum heat insulating material was put into the crusher, the organic fiber sheet was not confirmed to be cottony.
However, when the vacuum heat insulating material of Comparative Example 1 was put into a crusher, it was confirmed that the organic fiber sheet was made cottony.

Thus, from FIG. 6, if the tensile strength of the support material is 1 N / 25 mm or more, the support material can reliably support the laminated body of the organic fiber sheet slitted, that is, when inserted into the packaging material, It was confirmed that the deterioration of the assembly workability caused by the laminated body of the organic fiber sheets being separated can be suppressed.
Moreover, if the elongation rate at the time of complete breakage of the slit-processed organic fiber sheet is 200% or less, it is possible to suppress the fluffing of the organic fiber when it is crushed with a rotary blade, that is, a metal that is a recycled recovered material. It was confirmed that entanglement of organic fibers and filter clogging can be suppressed.

  1, 1A vacuum heat insulating material, 2 core material, 3 organic fiber sheet, 4 slit, 5, 5A support material, 6 packaging material.

Claims (6)

In a vacuum heat insulating material having a core material made of an organic fiber sheet and a packaging material having a gas barrier property and containing the core material and vacuum-sealed,
The slit is formed in the organic fiber sheet so that the organic fiber is divided in the length direction,
A vacuum heat insulating material characterized in that a support material is stacked on at least one surface in the thickness direction of the core material and stored in the packaging material.   2. The vacuum heat insulating material according to claim 1, wherein the organic fiber sheet in which the slits are formed has an elongation percentage at the time of complete breakage of 200% or less.   The vacuum heat insulating material according to claim 1 or 2, wherein the tensile strength of the support material is 1 N / 25 mm or more.   The said heat insulating material is an inorganic fiber sheet, The vacuum heat insulating material of any one of Claim 1 thru | or 3 characterized by the above-mentioned.   The vacuum heat insulating material according to any one of claims 1 to 3, wherein the support material is wound around the core material so as to cover both surfaces of the core material in a thickness direction.   The vacuum heat insulating material according to any one of claims 1 to 5, wherein the support material has a static friction coefficient smaller than a static friction coefficient of the organic fiber sheet and larger than 0.01.

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