JP2010007806A - Vacuum thermal insulation panel and thermal insulation box body with this - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vacuum thermal insulation panel having high rigidity, excellent treating property, heat insulation performance and recycle property and a thermal insulation box body with this. <P>SOLUTION: The vacuum thermal insulation panel 1 for storing and sealing a core material 2 in an external package material 10 having gas barrier properties so that inside of the external package material 10 is brought to be a decompressed state. The core material 2 is structured by an organic fiber body 3 having an irregular part in a thickness direction or is structured by laminating the organic fiber bodies 3. The vacuum thermal insulation panel 1 is arranged between an outer box and an inner box of the thermal insulation box body. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a vacuum heat insulation panel and a heat insulation box provided with the same, and more particularly to a vacuum heat insulation panel and a heat insulation box suitable for application to a cooling apparatus.

  Conventionally, urethane has been generally used as a heat insulating material, but recently, vacuum insulation panels having better heat insulation performance than urethane have come to be used in combination with urethane. Such a vacuum heat insulation panel is used not only for a refrigerator but also for a cooling device such as a heat storage, a vehicle air conditioner, and a water heater.

The vacuum insulation panel is made by inserting powder, foam, fiber, etc. as a core material into an outer packaging material made of aluminum foil with gas barrier properties (same as air barrier property), and the inside is kept at a degree of vacuum of several Pa. It is what.
One of the causes of the deterioration of the heat insulation performance of such a vacuum insulation panel is not only air and water entering from the outside, but also outgas generated from the core material and moisture present in the core material itself. In order to do this, an adsorbent is inserted into the outer packaging material.

As a core material of a vacuum heat insulation panel, there are powders such as silica, foams such as urethane, fiber bodies such as glass, etc., but currently, fiber bodies having the most excellent heat insulation properties are mainly used.
There are roughly two types of fiber bodies, inorganic fibers and organic fibers. Examples of inorganic fibers include glass fibers and carbon fibers (see, for example, Patent Documents 1 and 8). Examples of the organic fiber include polypropylene fiber, polylactic acid fiber, aramid fiber, LCP (liquid crystal polymer) fiber, polyethylene terephthalate fiber, polyester fiber, polyethylene fiber, and cellulose fiber (see, for example, Patent Documents 2 and 7).

  Further, the shape (form) of the fibrous body includes a cotton-like one, a laminate of sheets (for example, see Patent Documents 3 and 4), a laminate of sheets so that fiber orientations are alternated, and the like. Yes (see, for example, Patent Documents 5 and 6).

  By the way, since the vacuum insulation panel is depressurized to about several Pa inside, it always receives a pressure almost equal to the atmospheric pressure in the thickness direction, and must have a strength sufficient to withstand this pressure. . Moreover, when applying a vacuum heat insulation panel to a heat insulation box, normally, the circumference | surroundings are filled with heat insulating materials, such as a polyurethane foam resin. Thereby, a vacuum heat insulation panel receives the foaming pressure of a filler in addition to atmospheric pressure.

  Thus, since the vacuum heat insulation panel always receives pressure from the outside, it needs to be strong enough to withstand the pressure. When the core material is a fibrous body, the core material is crushed by the pressure received from the outside according to the strength of the fiber. As a result, the filling rate of the core material after vacuum packaging is a little less than 10% for glass fibers (see Patent Document 1), whereas it is a little less than 20% for polyester fibers (see Patent Document 7).

  Since the strength of the vacuum heat insulating panel is mainly formed by a core material inserted into the outer packaging material, the structure of the core material is also important as well as the material of the core material. As a core material structure resistant to stress in the thickness direction, for example, when the cardboard is viewed from the thickness direction, a shape in which the rectangles are continuously connected in one direction, a shape in which the cardboard is connected to the hexagon when viewed from the thickness direction, Or there exists what was formed in the corrugated structure with the corrugated cardboard (for example, refer patent document 9).

JP-A-8-028776 (page 2-3) JP 2002-188791 A (page 4-6, FIG. 1) Japanese Patent Laying-Open No. 2005-344832 (page 3-4, FIG. 1) JP 2006-307924 A (page 5-6, FIG. 2) JP 2006-017151 A (page 3, FIG. 1) Japanese Examined Patent Publication No. 7-103955 (second page, FIG. 2) JP 2006-283817 A (pages 7-8) Japanese Patent Laying-Open No. 2005-344870 (page 7, FIG. 2) JP-A-11-201376 (page 5-6, FIG. 1, FIG. 5, FIG. 8)

  Conventional vacuum insulation panels are generally used with glass fiber or polyester fiber as the core material, but since glass fiber is hard and brittle, dust is scattered during the manufacture of vacuum insulation panels, and the skin and mucous membranes of workers There is a risk of irritation if it adheres to it, and its handling and workability are problematic. In addition, when considering the scene of recycling, for example, in a refrigerator, each product is pulverized in a recycling factory, and glass fiber is mixed with urethane waste and is used for thermal recycling. There was a problem that recyclability was not good.

  In addition, since organic fibers such as polyester are lower in strength than glass fibers, they are easily compressed by atmospheric pressure and the foaming pressure of the heat insulating material filled in the surroundings, and the filling rate of the core material in the vacuum heat insulating panel is glass fiber. It became larger and this was also a factor inferior in heat insulation performance.

  For this reason, as described in Patent Document 9, as a measure for improving the strength of the core material of the vacuum heat insulating panel, a rectangular or hexagonal structure as viewed from the thickness direction, or a corrugated shape is formed. Although there is a structure, in any case, since the core material is continuously connected in the thickness direction, which is the heat insulation direction, it is easy to transfer heat through the core material, and the heat insulation property cannot be sufficiently improved.

  The present invention has been made in order to solve the above-described problems, and has an object to provide a vacuum heat insulation panel having high rigidity, excellent handleability, heat insulation performance, and recyclability, and a heat insulation box using the same. It is a thing.

  The present invention relates to a vacuum heat insulating panel in which a core material is accommodated and sealed in a gas barrier outer packaging material, and the inner packaging material is decompressed, and the core material is an organic fiber having an uneven portion in the thickness direction. It consists of a body.

  Further, the heat insulation box according to the present invention has an outer box and an inner box disposed inside the outer casing via a space portion, and the vacuum heat insulation panel described above over a part or the entire area of the space portion. Is provided.

According to the present invention, it is possible to obtain a vacuum heat insulation panel having high rigidity and excellent handleability, heat insulation performance and recyclability.
Further, since the heat insulation box according to the present invention includes the vacuum heat insulation panel as described above, it is possible to maintain low heat transfer performance and increase the strength of the heat insulation box. Can be suppressed.

[Embodiment 1]
1 is a perspective view of a vacuum heat insulation panel according to Embodiment 1 of the present invention, and FIG. 2 is an exploded perspective view of FIG.
The vacuum heat insulation panel 1 accommodates a core material 2 in which a plurality of organic fiber bodies 3 having irregularities in the thickness direction are stacked in a gas barrier container 10 (hereinafter referred to as an outer packaging material) having air barrier properties. Is sealed and the inside is depressurized to a predetermined degree of vacuum. Reference numeral 9 denotes an adsorbent which is disposed or embedded in the core material 2 and adsorbs gas and moisture.

  The organic fiber body 3 constituting the core material 2 is made of a sheet-like non-woven fabric 4 made of, for example, polyester fiber as shown in FIG. 3A, and is formed in the thickness direction as shown in FIG. 3B. The circular arc portion 5 which is the uneven portion is bent (creased) into a continuous wave shape, and the shape is formed and held by sewing 8 with a sewing machine.

Thus, as shown in FIG. 4, the organic fiber body 3 in which the concavo-convex portion is formed in a corrugated shape is formed on the top of the arc portion 5 of the lower organic fiber body 3a and the arc portion of the upper organic fiber body 3b. 5 are stacked in multiple layers in the thickness direction through the space portion 7 so that the lower end portion 6 (hereinafter referred to as the bottom portion) is in contact with each other (in the figure, the case of six steps is shown), and a thick core material 2 is formed.
The core material 2 configured as described above is attached to the adsorbent 9 and accommodated in the outer packaging material 10, the opening is closed, and the inside is depressurized to a predetermined degree of vacuum, whereby the vacuum heat insulating panel 1 is configured.

  FIG. 5 shows another example of the core material 2. In this example, the lengths of the organic fiber bodies 3 in the vertical and horizontal directions are substantially equal, and 90 ° is formed on the lower organic fiber body 3 a. The rotated organic fiber body 3b of the upper layer is placed so that the extending directions of the corrugated shape intersect with each other, and thereafter, the organic fiber bodies 3b are alternately rotated by 90 ° and stacked.

  In the above description, the case where the organic fiber body 3 constituting the core material 2 is made of a sheet-like non-woven fabric made of polyester fiber is not limited to this, but is not limited to this, polypropylene fiber, polylactic acid fiber, Organic fibers such as aramid fiber, LCP (liquid crystal polymer) fiber, polyethylene terephthalate fiber, polyethylene fiber, cellulose fiber, and polystyrene fiber can also be used.

Further, in the above description, the case where the uneven portion of the organic fiber body 3 is formed in a corrugated shape in which the arc portion 5 is continuous is shown. For example, as shown in FIG. 6, the uneven portion in which the triangular portion 5a is continuous, or It may be formed by uneven portions of other shapes such as the uneven portion where the trapezoidal portion 5b is continuous, and may be laminated as shown in FIG. 4 or FIG.
Furthermore, in the above description, a case where the core material 2 is formed by laminating a plurality of organic fiber bodies 3 having uneven portions is shown, but a single layer organic fiber having uneven portions such as corrugated shapes with a thick plate thickness. The body 3 may be a core material.

  In the above description, the case of using the sewing 8 is shown as means for forming the concavo-convex portion such as the corrugated shape of the organic fiber body 3, but instead of the sewing 8, the bottom portion 6 of the concavo-convex portion is replaced with an adhesive or heat fusion It may be fixed by wearing and the shape may be maintained. In the case of using an adhesive, it is desirable to use a hot melt adhesive that generates less gas under vacuum. Furthermore, for example, when the trapezoidal portion 5b in FIG. 6B continuously forms the uneven portion, the uneven shape is obtained by thermally processing the sheet-like organic fiber using a mold in which the trapezoidal portion 5b is continuous. Can be formed.

  According to the present embodiment, the sheet-like organic fiber body 3 having a concavo-convex shape is laminated via the space portion 7 or laminated so that the extending directions of the concavo-convex portions are crossed, and the core material of the vacuum heat insulating panel 1. Therefore, the rigidity of the core material 2 is increased, the core material 2 is less crushed even under vacuum, and a low thermal conductivity can be maintained without increasing the filling rate of the core material 2. Moreover, since the core material 2 has a laminated structure, the space portion 7 is not formed in a continuous shape with respect to the thickness direction, which is a heat insulating direction, and thus the rigidity can be increased without deteriorating heat conduction. .

  Moreover, since the rigidity of the vacuum heat insulation panel 1 itself also becomes high because the rigidity of the core material 2 increases, for example, when the vacuum heat insulation panel 1 is embedded in a heat insulation box of a refrigerator, the strength can be improved. . Furthermore, since the creep resistance of the vacuum heat insulation panel 1 can be improved, the temporal deformation of the heat insulation box can be suppressed.

  In the core material 2 according to the present embodiment, when the height of the concavo-convex portion such as the corrugated shape of the organic fiber body 3 is high, the collision of gas molecules in the vacuum heat insulating panel 1 increases, so that the heat conduction of the gas increases. As a result, the heat conductivity of the vacuum heat insulating panel 1 is deteriorated. In order to reduce the collision probability of gas molecules, the height of the concavo-convex portion of the core material 2 may be set to be equal to or less than the mean free path of gas at the internal pressure of the vacuum heat insulating panel 1, thereby reducing the heat conduction of the gas. It can be suppressed to a negligible level.

[Embodiment 2]
FIG. 7 is a schematic explanatory view of a heat insulation box according to Embodiment 2 of the present invention, and shows the heat insulation box constituting the refrigerator.
The heat insulation box 20 is composed of an outer box 21 made of, for example, a thin steel plate, and an inner box 22 formed by vacuum molding of, for example, ABS resin provided on the inner side of the space G, with an opening on the front side. Is provided with a door 23 that can be freely opened and closed.

  In the space G formed between the outer box 21 and the inner box 22, the vacuum heat insulation panel 1 according to the first embodiment is disposed along the outer box 21 (or the inner box 22). It is affixed to the outer box 21 (or inner box 22) with a tape or an adhesive. The remaining space G between the outer box 21 and the inner box 22 is filled with, for example, hard urethane foam, which is the filler 24, and is filled with foam.

  In the above description, the vacuum heat insulation panel 1 is disposed in the space G formed between the outer box 21 and the inner box 22, and is attached to the outer box 21 (or the inner box 22) to remain the remaining space. Although the case where the filler 24 is filled in G is shown, the vacuum heat insulation panel 1 is arranged to float in the space G, and between the vacuum heat insulation panel 1 and the outer box 21 and the inner box 22 or any one of them. The filler 24 may be filled.

  In the above description, the vacuum heat insulation panel 1 is disposed in a part of the space formed between the outer box 21 and the inner box 22 and the remaining space G is filled with the filler 24. Although shown, the vacuum heat insulation panel 1 may be disposed in the entire region of the space G, and the filling of the filler 24 may be omitted.

  According to the present embodiment, the vacuum heat insulation panel 1 having excellent heat insulation performance and high rigidity and creep resistance is provided in the space G formed between the outer box 21 and the inner box 22 of the heat insulation box 20. Since it arrange | positioned, while maintaining low heat conductivity, the intensity | strength of the heat insulation box 20 can be raised, and also the deformation | transformation with time of the heat insulation box 20 can be suppressed.

It is a perspective view of the vacuum heat insulation panel which concerns on Embodiment 1 of this invention. FIG. 2 is an exploded perspective view of FIG. 1. It is explanatory drawing of the raw material of the organic fiber body of FIG. 2, and explanatory drawing of an organic fiber body. It is a perspective view which shows the lamination | stacking state of the organic fiber body of FIG. It is a perspective view which shows the other lamination | stacking state of the organic fiber body of FIG. It is explanatory drawing which shows the other shape of the uneven | corrugated | grooved part of an organic fiber body. It is typical explanatory drawing of the heat insulation box which concerns on Embodiment 2 of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 Vacuum insulation panel, 2 core material, 3 organic fiber body, 5 circular arc part (uneven part), 8 sewing, 9 adsorbent, 10 outer packaging material, 20 heat insulation box, 21 outer box, 22 inner box, 24 filler, G Space part.

Claims (9)

A vacuum insulation panel in which a core material is housed and sealed in a gas barrier outer packaging material, and the outer packaging material is in a reduced pressure state,
A vacuum heat insulating panel, wherein the core material is composed of an organic fiber body having an uneven portion in the thickness direction. A vacuum insulation panel in which a core material is housed and sealed in a gas barrier outer packaging material, and the outer packaging material is in a reduced pressure state,
A vacuum heat insulating panel, wherein the core material is formed by laminating a plurality of sheet-like organic fiber bodies having uneven portions in a thickness direction.   The organic fiber body which comprises the said core material is laminated | stacked through the space part formed of the uneven | corrugated | grooved part, or the said organic fiber body was laminated | stacked so that an uneven | corrugated | grooved part might be crossed. Vacuum insulation panel.   The unevenness part of the organic fiber body which constitutes the core material is wave shape, triangle shape, or trapezoid shape, The vacuum heat insulation panel according to any one of claims 1 to 3 characterized by things.   The vacuum heat insulating panel according to any one of claims 1 to 4, wherein the concavo-convex portion of the organic fiber body constituting the core material is formed by sewing, bonding with an adhesive, heat fusion, or heat processing.   The vacuum heat insulation according to any one of claims 1 to 5, wherein the height of the concavo-convex portion of the organic fiber body constituting the core material is equal to or less than the mean free path of gas at the internal pressure of the vacuum heat insulation panel. panel.   The vacuum insulation panel according to any one of claims 1 to 6, wherein the organic fiber body constituting the core material is made of a nonwoven fabric made of organic fibers.   It has an outer box and an inner box arranged through the space inside the outer box, and the vacuum heat insulation panel according to any one of claims 1 to 7 is arranged over a part or the entire area of the space. A heat insulating box characterized by that.   9. The heat insulation box according to claim 8, wherein the vacuum heat insulation panel is disposed in a part of a space formed between the outer box and the inner box, and the remaining space is filled with a filler. body.

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