JP2010096293A - Vacuum heat insulating material - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vacuum heat insulating material capable of enhancing heat insulating performance by a curved surface shape. <P>SOLUTION: The vacuum heat insulating material in a curved surface shape includes a core material made of a plurality of laminated fiber sheets, a sheet material covering the core material tightly with the inside decompressed, and slip sheets inserted between the fiber sheets, wherein the fiber sheets are separated in the plane direction to form a plurality of separate cores, and a shrink space surrounded by the separate cores and slip sheets or the sheath material is provided at the fiber sheets in at least part thereof. Thus, the difference in the circumferential length caused between the outside and inside when the vacuum heat insulation is processed into a roll shape is reduced, a heat insulating material free from wrinkles can be made, and the performance of the vacuum heat insulation is enhanced. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a vacuum heat insulating material that can insulate an object having a non-planar surface.

  A vacuum insulation material that can insulate a conventional non-planar refrigeration equipment comprises a flexible jacket and a filling material, and the filling material is an open-cell polymer foam composed of at least two plates. In order to facilitate sliding, a plastic sheet is sandwiched between each pair of adjacent plates (see, for example, Patent Document 1).

JP-T-2004-502118 (2 pages, claim 2)

  In the conventional vacuum heat insulating material, when the vacuum heat insulating material is bent along the curved surface shape of the cylindrical object as a non-planar surface, the outer cover covering the plate-like polymer foam is first cylindrical at the end in the process of evacuation. Therefore, it becomes difficult to bend the entire vacuum heat insulating material along the curved surface of the cylindrical object, and the foam tends to be polygonal. For this reason, there has been a problem that the heat insulation performance is significantly lowered and the outer casing is damaged.

  This invention was made in order to solve the above problems, and it aims at improving the heat insulation performance at the time of attaching a vacuum heat insulating material to a refrigeration equipment, and the reliability at the time of a process.

  The vacuum heat insulating material according to the present invention includes a core material made of a fiber sheet, a separation core material made of a fiber sheet and having a space in part, and a sliding sheet, and the core material, the separation core material, and the slip In the vacuum heat insulating material constituted by laminating sheets, a surface perpendicular to the laminating direction of the separation core material faces at least one sliding sheet.

  In the vacuum heat insulating material according to the present invention, when the vacuum heat insulating material is bent along a non-planar shape, for example, the curved surface shape of the cylindrical object, when the vacuum heat insulating material is bent at the core at a different distance in the radial direction from the center of the cylindrical object. Since the difference in the circumferential length that occurs can be absorbed, it is difficult for the vacuum heat insulating material to be broken, and heat dissipation through the folded portion can be prevented. Further, the inner surface of the outer casing along the curved surface is hardly folded and wrinkled, and the adhesion between the cooling / heating device and the inner surface packaging material is improved. In addition, damage to the jacket can be prevented.

Embodiment 1 FIG.
1 is a cross-sectional view showing a vacuum heat insulating material according to Embodiment 1 of the present invention. FIG. 2 is a cross-sectional view showing a state in which the vacuum heat insulating material according to Embodiment 1 of the present invention is wound around a cylindrical object 11 that is a cylindrical heat retaining device. In the figure, a core material 1 made of one or a plurality of laminated fiber sheets, and an eleventh component member 2a, a twelfth component member 2b, and a thirteenth component member 2c, also made of one or a plurality of laminated fiber sheets. Each is divided perpendicularly to the bending direction (ie, the direction along the circumference; hereinafter, only described as the bending direction), between the eleventh component member 2a and the twelfth component member 2b, and the twelfth component member 2b. A first separation core member 2 having a first expansion / contraction space 3 as a space for absorbing the difference between the inner and outer circumferences when it is held in close contact with the thirteenth constituent member 2c along the curved surface shape of the cylindrical object 11. And composed of a single fiber sheet or a plurality of laminated fiber sheets, divided into a twenty-first component member 4a, a twenty-second component member 4b, and a twenty-third component member 4c perpendicular to the bending direction, respectively. The inner and outer circumference length difference is maintained between the component member 4a and the twenty-second component member 4b, and between the twenty-second component member 4b and the twenty-third component member 4c, when they are held in close contact with each other along the curved surface shape of the cylindrical object 11. A second separation core member 4 having a second stretchable space 5 is provided as a space for absorbing water.

  In the figure, when the core material 1 and the first separation core material 2 are held in close contact with each other along the curved surface shape of the cylindrical object 11, the core material 1 and the first separation core material. A first sliding sheet 6 for reducing the frictional resistance between the first and second constituent members 2a, 2b, and 13c with respect to the core material 1; When the first separation core member 2 and the second separation core member 4 are held in close contact with each other along the curved surface shape of the cylindrical object 11, the first separation core member 2 and the second separation core member A second slip for reducing the frictional resistance with the material 4 and making the 21st component member 4a, the 22nd component member 4b, and the 23rd component member 4c slip easily with respect to the first separation core material 2. When the sheet 7 and the curved surface shape of the cylindrical object 11 are held in close contact with each other, the inside of the vacuum heat insulating material is kept in a vacuum. The outer covering material 8 that forms the outer surface together, the inner covering material 9 that forms the inner surface on the heat insulating surface side while keeping the inside of the vacuum heat insulating material in a vacuum, the second separation core material 4 and the inner covering An outer slip sheet 10 for reducing the frictional resistance with the material 9 and making the 21st component member 4a, the 22nd component member 4b, and the 23rd component member 4c slip easily with respect to the inner sheath material 9; Is provided.

  Next, the manufacturing method of the vacuum heat insulating material in Embodiment 1 of this invention is demonstrated. For example, a paper sheet made by mixing water and fibers, and then drying to form a sheet (the fiber sheet is generally used and already known, so the illustration of the fiber sheet alone is omitted here) The core material 1 is manufactured by cutting one sheet or a plurality of sheets into a required size. The first separation core material 2 and the second separation core material 4 are manufactured by the same method. Here, the fiber sheet includes, for example, a glass material and a resin material. In the case of a resin-based material, there are polyethylene, polypropylene, polystyrene, polyester including polyethylene terephthalate, and the like. Of course, a mixture of inorganic fibers made of an inorganic material and resin fibers made of a resin material may be used.

  Next, a first sliding sheet cut between the core material 1 and the first separated core material 2 to an appropriate size with a size that covers the entire core material 1 and the first separated core material 2. 6 and an appropriate size that covers the entire first and second separation cores 2 and 4 between the first and second separation cores 2 and 4. The second sliding sheet 7 that is cut to the right is provided, and the second separating core member 4 is covered with the second separating core member 4 at a position facing the second sliding sheet 7 with the second separating core member 4 interposed therebetween. An outer slip sheet 10 cut to an appropriate size is provided, and the outer cover member 8 and the inner cover member 9 are covered in a state where they are laminated. The outer covering material 8 is provided at a position covering the core material 1, and the inner covering material 9 is provided at a position covering the covering slip sheet 10.

  Here, the first sliding sheet 6 and the second sliding sheet 7 are sized to cover the whole of the first separation core material 2 and the second separation core material 4, but the core material 1 and the second The size is not particularly defined as long as the friction generated between each of the first separation core member 2 and the first separation core member 2 and the second separation core member 4 can be reduced and the effect of making it slippery can be achieved. Of course, it may be smaller than the first separation core material 2 or the second separation core material 4.

  The vacuum heat insulating material configured as described above is placed in the vacuum chamber. Next, by depressurizing the inside of the vacuum chamber, the inside covered with the outer covering material 8 and the inner covering material 9 is depressurized to be in a vacuum state. The vacuum state in this case is a state in which the inside covered with the outer jacket material 8 and the inner jacket material 9 is at a vacuum pressure of about 0.1 to 3 Pa, for example. Next, by bonding the outer covering material 8 and the inner covering material 9, the inside covered with the outer covering material 8 and the inner covering material 9 is sealed, and the pressure in the vacuum chamber is brought to atmospheric pressure. return. As a result, the vacuum heat insulating material is maintained in a vacuum state, and the inside covered with the outer jacket material 8 and the inner jacket material 9 receives a compressive force due to a pressure difference with the outside.

  It should be noted that the gas is generated from the core material 1, the first separation core material 2, the first sliding sheet 6, the outer jacket material 8, or the like by being placed in a vacuum for a long time, or from the outside. When an appropriate gas adsorbent is inserted into the interior covered with the outer jacket material 8 and the inner jacket material 9 as necessary There is also.

  The moisture contained in the fiber sheet in advance may be removed by providing a step of sucking while heating the fiber sheet before and after cutting, in addition to the drying step at the time of papermaking. In addition, a mechanism for heating the inside of the vacuum chamber is provided in a state where the pressure is reduced in the vacuum chamber, and the fiber itself is at a temperature at which a thermal load such as thermal contraction or thermal decomposition is not applied, and vacuum discharge or the like is not induced. Water may be removed under appropriate conditions such as pressure.

  The vacuum heat insulating material can be manufactured relatively easily if it has a flat plate shape as shown in FIG. However, for example, in the case where a vacuum heat insulating material having a thickness of 8 mm is closely held along the curved surface shape of the cylindrical object 11 having a non-planar diameter of about 400 mm, the outer side forming the outer surface of the vacuum heat insulating material and the heat insulating surface side of the vacuum heat insulating material The inner and outer peripheral lengths differ from the inner surface by about 50 mm. Therefore, in the conventional vacuum heat insulating material described in Patent Document 1, the outer cover and the filling material are already fixed by vacuuming at both ends of the flat vacuum heat insulating material, and the curved surface shape of the cylindrical object 11 Since the filling material does not have a space for absorbing the inner and outer circumference length difference when it is held in close contact with each other, that is, during bending, the filling material is bent together with the outer cover of the inner surface and becomes wrinkled.

  Then, in the vacuum heat insulating material in Embodiment 1 of this invention, the space which absorbs the expansion-contraction of the length equivalent to the said inner and outer periphery length difference is provided in the 1st separated core material 2 and the 2nd separated core material 4, By using the first stretchable space 3 and the second stretchable space 5 respectively, the eleventh component 2a of the first separation core member 2a is brought into close contact with the curved surface shape of the cylindrical object 11, that is, during bending. The twelfth component member 2b, the thirteenth component member 2c, and the twenty-first component member 4a, the twenty-second component member 4b, and the twenty-third component member 4c of the second separation core 4 are connected to the first telescopic space 3 and the second component. By moving so as to fill the expansion and contraction space 5, wrinkles caused by the difference between the inner and outer peripheral lengths can be prevented, and the cylindrical object 11 can be held tightly along the curved surface shape. Here, the first sliding sheet 6, the second sliding sheet 7, and the outer covering sliding sheet 10 reduce the friction coefficient between the core members and between the core member and the outer covering member so that the movement can be performed smoothly. Have a role.

  Here, in the vacuum heat insulating material according to the first embodiment of the present invention, no sliding sheet or outer covering sheet is provided between the core material 1 and the outer outer covering material 8, but the configuration is also the same. It is clear that a good effect can be obtained.

  In order to confirm the above effect, a manufacturing test was performed for a case where a vacuum heat insulating material having a thickness of 8 mm was held in close contact with the curved surface shape of the cylindrical object 11 having a diameter of about 400 mm. As a result, in the conventional vacuum heat insulating material that does not provide the expansion / contraction space, the unevenness of about 3 mm in height is generated along the inner surface at intervals of about 10 mm in the bending direction, that is, in the circumferential direction, whereas the expansion / contraction space is provided. In the vacuum heat insulating material, both the unevenness height and spacing were improved by about twice. Thereby, the contact state between the heat insulation surface and the inner surface of the vacuum heat insulating material was improved, and it was confirmed that the heat insulation performance was improved about twice.

  Furthermore, an element test was conducted to confirm the effect of the sliding sheet. In a state where the three core materials were superposed, a pressure of about 1 kgf / cm 2 was applied from the upper surface, and the force when the core material in the middle was pulled out from the side was measured to obtain the maximum static friction coefficient μmax. As a result, the core material alone having a μmax of 0.6 or more is reduced to about 0.35 by inserting a slip sheet (here, a PET 75 μm sheet) between the core materials. confirmed. Therefore, the eleventh component member 2a, the twelfth component member 2b, the thirteenth component member 2c of the first separation core member 2, the twenty-first component member 4a, the twenty-second component member 4b, and the twenty-third component of the second separation core member 4. Friction resistance when the component member 4c moves so as to fill the first stretchable space 3 and the second stretchable space 5 can be reduced, and a vacuum heat insulating material with less wrinkles and excellent heat retaining effect can be provided.

  In the manufacturing method of the vacuum heat insulating material, a fiber sheet manufacturing method was shown by a wet method using a papermaking method, but nothing is limited thereto, for example, when a glass material is used, a centrifugal separation method, In the case of using a resin material, a dry sheet manufacturing method such as a spun bond method or a melt blow method may be used.

Embodiment 2
FIG. 3 is a cross-sectional view showing a vacuum heat insulating material in Embodiment 2 of the present invention. FIG. 4 is a cross-sectional view showing a state in which the vacuum heat insulating material in Embodiment 2 of the present invention is wound around a cylindrical object 11 that is a cylindrical heat insulating device. In the first embodiment, when the first separation core member 2 and the second separation core member 4 are overlapped on a plane, the first stretchable space 3 and the second stretchable space 5 are provided at the overlapping positions. However, in the vacuum heat insulating material in Embodiment 2 of this invention, the 1st expansion-contraction space 3 and the 2nd expansion-contraction space 5 are provided in the position which does not overlap. By adopting such a configuration, when the cylindrical object 11 is closely held along the curved surface shape, that is, at the time of bending, the seam between the eleventh component member 2a and the twelfth component member 2b of the first separation core member 2 is used. A seam of the 21st component member 4a and the 22nd component member 4b of the second separation core member 4, a seam of the twelfth component member 2b and the 13th component member 2c of the first separation core member 2, The seam of the 22nd component member 4b and the 23rd component member 4c of the second separation core member 4 does not coincide with each other, and bending wrinkles do not concentrate at a specific place.

  Further, as shown in the first embodiment of the present invention, when the first stretchable space 3 and the second stretchable space 5 overlap each other due to the compressive force in the stacking direction at the time of evacuation, it occurs at that position. When the large space is crushed, a large distortion occurs in one place. As shown in the second embodiment of the present invention, when the first stretchable space 3 and the second stretchable space 5 do not overlap, Such a large space is not generated, and further, the first stretchable space 3 includes the 21st component member 4a, the 22nd component member 4b, or the 23rd component member of the core material 1 and the second separation core material 4. By adopting the configuration surrounded by 4c, the result is that the upper and lower sides are protected by these core materials, and further improvement is seen in the uneven height of the bent wrinkles. As a result, the heat insulation surface and the vacuum heat insulating material inner surface The contact state is further improved, and higher heat retention performance is obtained.

Embodiment 3
FIG. 5 is a cross-sectional view showing a vacuum heat insulating material in Embodiment 3 of the present invention. FIG. 6 is a cross-sectional view showing a state in which the vacuum heat insulating material in Embodiment 3 of the present invention is wound around a cylindrical object 11 that is a cylindrical heat insulating device. In the first embodiment, in order to absorb the difference between the inner and outer peripheral lengths generated when the vacuum heat insulating material is wound around the cylindrical object 11 which is a cylindrical heat retaining device, the first separation core member 2 is subjected to the first expansion and contraction. Although the space 3 is provided and the second stretchable space 5 is provided in the second separation core material 4, the density is low as compared with the first separation core material 2 as a stretchable region instead of the first stretchable space 3. The first stretchable core member 12 made of a low elastic fiber sheet and the stretchable region that takes the place of the second stretchable space 5 have a lower density and a lower elastic fiber sheet than the second separation core member 4. By providing each of the two stretchable core members 13, the above-described problems can be solved, and the number of parts can be reduced as compared with the first embodiment, which makes it easy to manufacture.

  For example, when a dry manufacturing method is used, the stretchable core material can be easily provided by providing a fiber density difference at the time of producing a fiber sheet. In addition, since the stretchable core member does not have a space, the first stretchable space 3 or the second stretchable space 5 is not crushed by the compressive force in the stacking direction when evacuated, and a reinforcing effect is obtained. Therefore, distortion can be suppressed and a more reliable vacuum heat insulating material can be manufactured.

  In Embodiment 3 of the present invention, each of the separation cores is provided with two stretchable cores. However, the number of stretchable cores is not limited to two, but the diameter of the cylindrical object 11 and the material of the fiber sheet. Depending on the thickness of the separation core, etc., any number of locations may be provided. In some cases, the separation core is not provided, and the whole may be composed of a stretch core having a high compression tension.

Embodiment 4 FIG.
FIG. 7 is a cross-sectional view showing a vacuum heat insulating material in Embodiment 4 of the present invention. In the first embodiment, between the core material 1 and the first separation core material 2, between the first separation core material 2 and the second separation core material 4, and the second separation core. Between the material 4 and the inner covering material 9, there are a first sliding sheet 6, a second sliding sheet 7, and an outer covering sheet 10 for reducing frictional resistance and making them slippery. Each sheet is provided one by one, but these sheets may be formed by overlapping two sheets on necessary portions in order to further reduce the frictional resistance and make it easier to slip.

  In FIG. 7, the first divided sliding sheet 14 and the second divided sliding sheet 15 provided corresponding to the first separation core material 2 and the second separation core material 4 respectively correspond to the respective constituent members. The portions where the respective constituent members overlap, the respective constituent members of the first separation core member 2, the respective constituent members of the core member 1 or the second separation core member 4, and the inner covering member 9 respectively overlap. Although it is set as the structure of two sheets piled up in a part, it is not restricted to this structure.

  Even if the second split sliding sheet 15 provided between the second separation core member 4 and the inner covering member 9 is made of the same material as that of the second sliding sheet 7, You may be comprised with the raw material similar to the sheet | seat 10. FIG. Of course, the second sliding sheet 7 and the outer covering sliding sheet 10 may have the same material or the same properties.

  The vacuum heat insulating material according to the fourth embodiment of the present invention makes the separation core material easier to move from the difference between the friction force between the sliding sheets and the friction force between the sliding sheet and the separation core material. When the component members sandwiched by the divided sliding sheets move together with the divided sliding sheets when they are held in close contact with each other along the curved surface shape, that is, during bending, they face these divided sliding sheets. Less frictional resistance is obtained at the contact surface with other sliding sheets.

  In addition, the frictional force between the sliding sheets can be further reduced by providing a lubricating means between the divided sliding sheet and another sliding sheet facing the divided sliding sheet. 9 to 12 are diagrams schematically showing a case where a lubricating means is provided between the divided sliding sheet and another sliding sheet facing the divided sliding sheet. FIG. 9 schematically shows a case where spherical particles are inserted as a lubricating means. Examples of the spherical particles include glass spheres, ceramic spheres, silica spheres, and acrylic spheres. FIG. 10 is a diagram schematically showing a case where a thin film piece is inserted as a lubricating means. Examples of the thin film pieces include artificial or natural mica pieces. FIG. 11 is a diagram schematically showing a case where a low friction material is applied to the joint surface as a lubricating means. Examples of the coating agent include silica-based and fluorine-based resin release agents. FIG. 12 is a diagram schematically showing a case where a cylindrical roller is inserted as the lubricating means. Examples of the cylindrical roller agent include resin fibers such as polystyrene, polyethylene terephthalate, and polypropylene, in addition to glass and ceramics. These lubrication means are examples, and there are many other lubrication means that can reduce the frictional force between the sliding sheets, and the present invention is not limited to these.

  Here, Table 1 shows the results of measuring the maximum static friction coefficient of the two-layered sliding sheets when the lubrication means is not used and when the specific lubrication means is used by the same method as the element test.

As can be seen from Table 1, when the sliding sheet is doubled as compared with the maximum static friction coefficient of about 0.35 (μmax) when only one sliding sheet is inserted between the cores. Can be reduced to half the maximum static friction coefficient of 0.16 (μmax), and the maximum static friction coefficient can be further reduced to about half by providing an appropriate lubricating means. However, it is obvious that these experimental values vary depending on conditions. In addition, when a fine powder component such as spherical particles is used as a lubricating means, it is possible that the fine powder component is scattered by suction to a vacuum pump or the like during vacuuming. For this reason, it is necessary to take measures to prevent scattering and to maintain the mass production.

  In response to the measurement result, a manufacturing test similar to that of the first embodiment was carried out using a sheet with a single-sided release agent, which is a method of applying a low friction material to the joint surface as a lubricating means. As a result, bending wrinkles and irregularities were almost eliminated, the contact state between the heat-insulated surface and the inner surface of the vacuum heat insulating material was further improved, and a higher heat retaining performance close to the heat retaining performance possessed by the planar vacuum heat insulating material itself was obtained. In other words, the two-layer sliding sheet using a release agent as a lubrication means moves each component member of the separation core material more smoothly so as to fill the expansion / contraction space provided in advance during the bending process. As a result that the inner and outer peripheral length differences generated when the material is held in close contact with the curved surface shape of the cylindrical object 11 can be more appropriately absorbed, bending wrinkles and irregularities are eliminated, and heat loss generated from these is almost eliminated. by.

  In addition, in the vacuum heat insulating material in Embodiment 4 of this invention, although it is set as the structure which makes each sheet | seat sheet 2 sheet | seats overlap with respect to the said Embodiment 1, each sheet | seat sheet | seat is set to 2 with respect to the said Embodiment 3. It is good also as a structure made into a sheet pile. FIG. 8 is a cross-sectional view showing a vacuum heat insulating material in a configuration in which two sliding sheets are stacked on the third embodiment.

  Moreover, in the said Embodiment 1, it was set as the structure which provided only the expansion-contraction space in order to absorb the inner-periphery length difference produced when winding a vacuum heat insulating material around the cylindrical object 11 which is a cylindrical heat retention apparatus, and the said implementation. In the third embodiment, only the stretchable core material is provided in order to absorb the difference between the inner and outer circumference lengths when the vacuum heat insulating material is wound around the cylindrical object 11 that is a cylindrical heat retaining device. It is good also as a structure provided combining the expansion-contraction core material.

  Moreover, in the said embodiment, it was set as the structure which provided the expansion-contraction space or the expansion-contraction core material 3 each in the predetermined position of each isolation | separation core material, However, These positions and number can be changed according to bending conditions. However, it is not particularly limited to the position and number shown in the figure. That is, the sliding sheet may be configured only by the covering sheet 10, and although not shown in the example, the covering sheet 10 may be provided between the core material 1 and the outer covering material 8.

  Moreover, you may design the covering slip sheet | seat 10 shown in these embodiment to suitable thickness by 1 sheet or several sheets so that shrink space or an expansion-contraction core material may endure the compressive force at the time of a vacuum. In this case, more effective circumference difference absorption is possible.

  In the above embodiment, the vacuum heat insulating material is described as a non-planar shape wound around the cylindrical surface of the cylindrical object 11 which is a cylindrical heat retaining device, but is not particularly limited to a cylindrical surface, for example, If the surface has a non-planar surface consisting of a curved surface, a polygonal shape or an indefinite shape, such as a curved surface, or a curved surface, the inner and outer peripheral length difference may occur when the vacuum heat insulating material is closely held along the surface of the heat insulation device. Obviously, the shape of the heat-reducing device can also be used in accordance with conditions such as the thickness, number of layers, size, shape, and inner / outer length difference of the vacuum heat insulating material.

It is sectional drawing which shows the vacuum heat insulating material in Embodiment 1 of this invention. It is sectional drawing which shows the state by which the vacuum heat insulating material in Embodiment 1 of this invention was wound around the cylindrical object 11 which is a cylindrical heat retention apparatus. It is sectional drawing which shows the vacuum heat insulating material in Embodiment 2 of this invention. It is sectional drawing which shows the state in which the vacuum heat insulating material in Embodiment 2 of this invention was wound around the cylindrical object 11 which is a cylindrical heat retention apparatus. It is sectional drawing which shows the vacuum heat insulating material in Embodiment 3 of this invention. It is sectional drawing which shows the state in which the vacuum heat insulating material in Embodiment 3 of this invention was wound around the cylindrical object 11 which is a cylindrical heat retention apparatus. It is sectional drawing which shows the vacuum heat insulating material in Embodiment 4 of this invention. It is sectional drawing which shows the vacuum heat insulating material in Embodiment 4 of this invention. It is a schematic diagram which shows the lubrication means in Embodiment 4 of this invention. It is a schematic diagram which shows the lubrication means in Embodiment 4 of this invention. It is a schematic diagram which shows the lubrication means in Embodiment 4 of this invention. It is a schematic diagram which shows the lubrication means in Embodiment 4 of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Core material, 2 1st isolation | separation core material, 2a 11th structural member, 2b 12th structural member, 2c 13th structural member 3 1st contraction space, 4 2nd isolation | separation core material, 4a 21st structural member, 4b 22nd component member, 4c 23rd component member, 5 2nd contraction space, 6 1st sliding sheet, 7 2nd sliding sheet, 8 outer covering material, 9 inner covering material, 10 covering slip sheet , 11 Cylindrical object, 12 First elastic core material, 13 Second elastic core material, 14 First divided sliding sheet, 15 Second divided sliding sheet, 16 Spherical particles, 17 Thin film piece, 18 Low friction material , 19 Cylindrical roller

Claims (5)

A core material composed of a fiber sheet, a separation core material composed of a fiber sheet and having a space in part, and a sliding sheet, and configured by laminating the core material, the separation core material, and the sliding sheet. In the vacuum heat insulating material, the surface perpendicular to the stacking direction of the separation core material faces at least one sliding sheet. It comprises a core material made of a fiber sheet, a separation core material made of a fiber sheet and having a stretchable region in part, and a sliding sheet, and is configured by laminating the core material, the separating core material, and the sliding sheet. In the vacuum heat insulating material, a surface perpendicular to the stacking direction of the separation core material faces at least one of the sliding sheets. The vacuum heat insulating material according to claim 1 or 2, wherein at least two sliding sheets are stacked. The sliding sheet facing a surface perpendicular to the stacking direction of the separation core material is divided so as to remove a portion facing the space or the stretchable region of the separation core material facing. Item 4. The vacuum heat insulating material according to Item 3. The vacuum heat insulating material according to claim 3 or 4, wherein a lubricating means is provided between the sliding sheets.

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