Thermal insulation material

Abstract

To provide a thermal insulation material that improves workability of installation of the thermal insulation material including a variably moisture-permeable airtight sheet and can secure the performance of the variably moisture-permeable airtight sheet.SOLUTION: A thermal insulation material comprises a fiber type thermal insulation material, and a skin body that is formed with a variably moisture-permeable airtight sheet and has a housing part housing the aforesaid fiber type thermal insulation material. The aforesaid fiber type thermal insulation material is not bonded with the aforesaid skin body being self-standing.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to a heat insulating material.

Background Art

[0002] Due to the increasing demand for energy conservation in recent years, heat insulation has become important in buildings and the like. Such heat insulating materials include fibrous heat insulating materials, foamed plastic heat insulating materials, and the like. The heat insulating material is used by being fitted into the structural frame of a building, and the heat insulating material suppresses the transfer of heat between the inside and outside of the building.

[0003] By the way, in winter, moisture may penetrate from the inside of a building into a wall or the like and cause condensation on the heat insulating material. In summer, moisture trapped in the heat insulating material or the wall of the building may cause condensation. Due to such condensation occurring inside the heat insulating material, the heat insulating material may not be able to fully exhibit its performance. Furthermore, when the water droplets due to condensation become large, the water droplets may fall from the heat insulating material onto the wood or the like of the building, which may cause corrosion of the wood and the growth of mold.

[0004] Therefore, a variable moisture permeable airtight sheet or the like is attached to the heat insulating material main body so that moisture that has penetrated into the inside of a wall or the like does not condense and accumulate on the heat insulating material. The variable moisture permeable airtight sheet can change the moisture permeability according to the relative humidity of the surrounding environment. For example, in winter when the relative humidity is low, the intrusion of moisture into the heat insulating material main body provided with the variable moisture permeable airtight sheet is suppressed (moisture is prevented), and the occurrence of condensation in the heat insulating material main body is prevented. In summer when the relative humidity is high, moisture is released from (moisture permeates through) the heat insulating material main body provided with the variable moisture permeable airtight sheet, and the occurrence of condensation in the heat insulating material main body is prevented.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] The variable moisture-permeable airtight sheet is attached to the structural frame so as to cover one main surface of the heat insulating material body after the heat insulating material body is fitted into the structural frame of the building. Since the construction of such a variable moisture-permeable airtight sheet is time-consuming and laborious, simplification of the construction work of the variable moisture-permeable airtight sheet has been desired. On the other hand, Patent Document 1 discloses a bagged heat insulating material in which an inorganic fiber-based heat insulating material is covered with a bag-shaped skin body in order to facilitate handling during the construction of the inorganic fiber-based heat insulating material. Therefore, it was considered to cover the heat insulating material body with a bag-shaped variable moisture-permeable airtight sheet. However, when such a bagged heat insulating material is constructed on a wall or the like, the heat insulating material body may move inside the bag, resulting in a decrease in the workability of the construction. Therefore, it is conceivable to adhere the heat insulating material body and the bag-shaped variable moisture-permeable airtight sheet to suppress the movement of the heat insulating material body inside the bag. However, the performance of the variable moisture-permeable airtight sheet has decreased at the adhesion portion between the heat insulating material body and the variable moisture-permeable airtight sheet.

[0007] An object of the present invention is to provide a heat insulating material that can improve the workability of the construction of a heat insulating material including a variable moisture-permeable airtight sheet and ensure the performance of the variable moisture-permeable airtight sheet.

Means for Solving the Problems

[0008] According to the present invention, a fibrous heat insulating material, a skin body formed of a variable moisture-permeable airtight sheet and having a housing portion for housing the fibrous heat insulating material, the fibrous heat insulating material is not adhered to the skin body and has self-supporting properties, and a heat insulating material is provided.

Effects of the Invention

[0009] According to the present invention, it is possible to improve the workability of the construction of a heat insulating material including a variable moisture-permeable airtight sheet and ensure the performance of the variable moisture-permeable airtight sheet.

Brief Description of the Drawings

[0010]

Figure 1

Figure 2

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BEST MODE FOR CARRYING OUT THE INVENTION

[0011] Hereinafter, embodiments will be described in detail with reference to the accompanying drawings. It should be noted that the following embodiments do not limit the invention according to the claims, and not all combinations of the features described in the embodiments are essential for the invention. Two or more of the plurality of features described in the embodiments may be arbitrarily combined. Also, the same or similar configurations are given the same reference numerals, and redundant descriptions are omitted.

[0012] [Heat Insulating Material According to this Embodiment] The heat insulating material according to this embodiment includes a fibrous heat insulating material, a housing portion that houses the fibrous heat insulating material, and a skin body formed of a variable moisture permeable airtight sheet. Further, the fibrous heat insulating material is not adhered to the skin body and has self-supporting properties. According to the heat insulating material according to this embodiment, the workability of the construction of the heat insulating material including the variable moisture permeable airtight sheet can be improved, and the performance of the variable moisture permeable airtight sheet can be ensured.

[0013] FIG. 1 shows a plan view of the heat insulating material according to the present embodiment, FIG. 2 shows a cross-sectional view taken along line A-A' of the heat insulating material according to the present embodiment, and FIG. 3 shows a cross-sectional view taken along line B-B' of the heat insulating material according to the present embodiment. As shown in FIG. 1, the heat insulating material 1000 according to the present embodiment includes a fibrous heat insulating material 100 and a skin body 200 formed of a variable moisture permeable airtight sheet.

[0014] The skin body 200 according to one embodiment is formed of two variable moisture permeable airtight sheets 200a and 200b as shown in FIGS. 2 and 3. The fibrous heat insulating material 100 is sandwiched between the two variable moisture permeable airtight sheets 200a and 200b which are overlapped. The fibrous heat insulating material 100 is in contact with and covered by the variable moisture permeable airtight sheets 200a and 200b, but is not adhered (unadhered) to the variable moisture permeable airtight sheets 200a and 200b. Further, a concave portion is formed in one variable moisture permeable airtight sheet 200a, the other variable moisture permeable airtight sheet 200b is flat, and an accommodation portion 200c is formed in the skin body 200 by the two variable moisture permeable airtight sheets 200a and 200b. The fibrous heat insulating material 100 is accommodated in this accommodation portion 200c.

[0015] Further, the skin body 200 has a peripheral edge portion 200d around the accommodation portion 200c. The peripheral edge portion 200d has a pair of joint portions 300a extending in the length direction (Y direction) of the heat insulating material 1000 where the skin body 200 (variable moisture permeable airtight sheet) is joined, and a pair of joint portions 300b extending in the width direction (X direction) of the heat insulating material 1000. Also, in FIG. 1, the central side of the skin body 200, that is, the inside surrounded by the joint portions 300a and 300b is the accommodation portion 200c, and the outside of the accommodation portion 200c including the joint portions 300a and 300b is the peripheral edge portion 200d. The joint portions 300a and 300b are not particularly limited in their arrangement positions as long as they are arranged so as to be able to accommodate the fibrous heat insulating material 100. For example, the distance from the joint portion 300a to the side in the length direction (Y direction) of the skin body 200, and the distance from the joint portion 300b to the side in the width direction (X direction) of the skin body 200 are not limited. Also, in FIG. 1, the joint portions 300a and 300b extend linearly, but they may extend in a curved or meandering manner.

[0016] In addition, in FIG. 1, the joint portion 300a extending in the length direction (Y direction) and the joint portion 300b extending in the width direction (X direction) are each formed to extend to both ends in the length direction (Y direction) and the width direction (X direction) of the skin body 200 so as to intersect. However, the joint portion 300a and the joint portion 300b may be formed so as to extend to the point where they contact each other so as to form a rectangle or an annulus surrounding the accommodating portion 200c, or not to extend to the above-mentioned both ends. Furthermore, the length (width) in the direction orthogonal to the direction in which the joint portion 300a and the joint portion 300b extend is not particularly limited, and it is only necessary that the variable moisture permeable airtight sheets are joined and the fibrous heat insulating material 100 is not released from the accommodating portion 200c in the use environment. It may be formed with a width such that the entire peripheral edge portion 200d becomes the joint portion 300a and the joint portion 300b.

[0017] In one embodiment, the joint portions 300a and 300b may be portions where the variable moisture permeable airtight sheets 200a and 200b are joined by heat fusion, or may be portions where the variable moisture permeable airtight sheets 200a and 200b are joined by an adhesive or the like. Alternatively, one of the joint portions 300a and 300b may be a portion where the variable moisture permeable airtight sheets 200a and 200b are joined by heat fusion, and the other of the joint portions 300a and 300b may be a portion where the variable moisture permeable airtight sheets 200a and 200b are joined by an adhesive or the like. Examples of the adhesive include polyolefin-based hot melt adhesives, styrene-butadiene rubber-based adhesives, polyurethane-based adhesives, acrylic-based adhesives, epoxy resin-based adhesives, silicone resin-based adhesives, and the like.

[0018] The heat insulating material 1000 according to the present embodiment can be used for installation between columns of a wall, under a floor, or in a ceiling space or the like. At that time, the peripheral edge portion 200d of the heat insulating material 1000 can be fixed to a structural frame such as a floor joist, a wall plate, a partition post, or a column of a building using a tacker, a nail, or the like.

[0019] Thus, since the heat insulating material 1000 according to this embodiment has the fibrous heat insulating material 100 housed in the skin body 200, after fitting the fibrous heat insulating material into the building structure, it is not necessary to attach a variable moisture permeable airtight sheet, and the workability of installing the heat insulating material is improved. Further, when installing the heat insulating material, since the fibrous heat insulating material 100 does not come into direct contact with the installer, discomfort such as prickling of the installer can be reduced. Also, although the fibrous heat insulating material 100 is in contact with and covered by the skin body 200, it is not adhered to the skin body 200 (is not adhered). Thereby, since no adhesive is applied to the skin body 200, the performance of the variable moisture permeable airtight sheets 200a and 200b constituting the skin body 200 is ensured.

[0020] (Fibrous heat insulating material)

[0021] In one embodiment, the fibrous heat insulating material 100 has a first main surface 100a, a second main surface 100b, and a side surface 100c extending between the first main surface 100a and the second main surface 100b. The first main surface 100a and the second main surface 100b extend in the width direction (X direction) and the length direction (Y direction), and the side surface 100c extends in the thickness direction (Z direction). Note that the main surface indicates the surface with the largest surface area among the fibrous heat insulating material 100. In one embodiment, the fibrous heat insulating material 100 can have a rectangular parallelepiped shape, particularly a plate shape. For example, the dimensions of the fibrous heat insulating material 100 can be selected from the range where the length is 1000 mm or more and 3000 mm or less, the width is 265 mm or more and 910 mm or less, and the thickness is 42 mm or more and 140 mm or less.

[0022] The fibrous heat insulating material 100 according to this embodiment has self - standing properties. Although the fibrous heat insulating material 100 is not adhered to the skin body 200 (is not adhered), by making the fibrous heat insulating material 100 have self - standing properties in this way, when installing the heat insulating material 1000 on a wall or the like, movement of the fibrous heat insulating material 100 within the skin body 200 is suppressed, and the workability of installation is improved.

[0023] In this specification, whether a fibrous heat insulating material has "self-supporting property" is determined by the following method. FIG. 4 is a schematic view showing a method for determining whether a fibrous heat insulating material has self-supporting property. First, as shown in the upper figure of FIG. 4, the fibrous heat insulating material 100 is placed so that its second main surface 100b contacts the upper surface of a flat base 400. At this time, when the total length of the fibrous heat insulating material 100 in its length direction is L, a portion with a length of l1 (placement portion) is placed on the upper surface of the base 400, and a portion with a length of l2 (overhanging portion) is placed in a state of overhanging from the end of the base 400. At this time, the overhanging length of the portion of l2 (overhanging portion) is set to 600 mm. In this state, the fibrous heat insulating material 100 is left for 30 seconds or more. Next, as shown in the lower figure of FIG. 4, the angle α from the extension line of the first main surface 100a of the placement portion of the fibrous heat insulating material 100 left for 30 seconds or more to the first main surface 100a of the overhanging portion is obtained. When this angle α is 20 degrees or less, it is determined to have self-supporting property. The base 400 is not particularly limited as long as the surface on which the fibrous heat insulating material is placed, that is, the upper surface, is a surface substantially perpendicular to the direction of gravity.

[0024] Moreover, for a fibrous heat insulating material having self-supporting property determined in this way, when the fibrous heat insulating material is placed on a flat portion (a surface perpendicular to the direction of gravity) such as the floor in a state where the length direction of the fibrous heat insulating material substantially coincides with the direction of gravity, it has been confirmed that the fibrous heat insulating material can maintain its shape for 30 seconds or more (has shape retention property).

[0025] In one embodiment, the fibrous heat insulating material 100 can be composed of at least one of inorganic material fibers and organic material fibers. For example, the fibrous heat insulating material 100 can be composed of inorganic material fibers, and glass fibers such as glass wool and rock wool can be used. The fibrous heat insulating material 100 may contain a binder. For example, the binder of the glass wool fibrous heat insulating material 100 may contain a phenolic resin, an acrylic resin, an epoxy resin, a melamine resin, a polyvinyl alcohol resin, etc. Also, a binder mainly composed of a natural-derived material that does not substantially emit formaldehyde may be used.

[0026] In one embodiment, the content rate of the binder with respect to the total weight of the fibrous heat insulating material 100 can be 3% by weight or more, in another embodiment 5% by weight or more, and in a further embodiment 7% by weight or more. Also, in one embodiment it can be 13% by weight or less, in another embodiment 11% by weight or less, and in a further embodiment 9% by weight or less.

[0027] The density of the fibrous heat insulating material 100 is, in one embodiment, 8 kg / m 3 or more, in another embodiment 10 kg / m 3 or more, in a further embodiment 16 kg / m 3 or more, and in a further embodiment 25 kg / m 3 or more. In one embodiment, it can be 100 kg / m 3 or less, in another embodiment 80 kg / m 3 or less, in a further embodiment 60 kg / m 3 or less, and in a further embodiment 30 kg / m 3 or less.

[0028] (Skin body) The skin body 200 is at least partially in contact with and covers the first main surface 100a and the second main surface 100b of the fibrous heat insulating material 100, but is not adhered (unadhered) to the fibrous heat insulating material 100. The length and width of the skin body 200 can be equal to or greater than the length and width dimensions of the fibrous heat insulating material 100. The thickness of the skin body 200 is, in one embodiment, 2 mm or less, in another embodiment 1 mm or less, in a further embodiment 0.2 mm or less, and also, in one embodiment, 0.01 mm or more, in another embodiment 0.05 mm or more, and in a further embodiment 0.1 mm or more are exemplified.

[0029] In one embodiment, the skin member 200 is composed of variable moisture permeable airtight sheets 200a and 200b, and the variable moisture permeable airtight sheets 200a and 200b can change the moisture permeability according to the relative humidity of the surrounding environment. For example, as a commercially available variable moisture permeable airtight sheet, "Isobar Vario Extra Safe" (trade name) manufactured by Mag Isobar Co., Ltd. etc. can be exemplified, but it is not limited thereto.

[0030] [Heat insulating material according to another embodiment] The heat insulating material according to another embodiment has a skin member formed of a single variable moisture permeable airtight sheet. Hereinafter, the parts different from the skin member 200 according to this embodiment shown in FIG. 2 will be described. Also, the same components are given the same reference numerals, and the description of the common components is omitted.

[0031] FIG. 5 is a cross-sectional view corresponding to the A-A' cross-sectional view of FIG. 1 of the heat insulating material according to another embodiment. The skin member 200 according to another embodiment is formed of a single variable moisture permeable airtight sheet 200a. As shown in FIG. 5, at a location (side) 200e extending in the length direction (Y direction) at one end in the width direction (X direction) of the heat insulating material 1000, the single variable moisture permeable airtight sheet 200a is folded in half, and between them, the fibrous heat insulating material 100 is sandwiched. The fibrous heat insulating material 100 is in contact with and covered by the variable moisture permeable airtight sheet 200a, but is not adhered to the variable moisture permeable airtight sheet 200a (is not adhered). Further, a recess is formed in the variable moisture permeable airtight sheet on one side (upper side), and the variable moisture permeable airtight sheet on the other side (lower side) is flat, and the housing portion 200c of the skin member 200 is formed by the single variable moisture permeable airtight sheet 200a. The fibrous heat insulating material 100 is housed in the housing portion 200c.

[0032] [Heat insulating material according to yet another embodiment] Furthermore, the heat insulating material according to still another embodiment has an outer skin formed of two variable moisture permeable airtight sheets, and recesses are formed in the two variable moisture permeable airtight sheets. Hereinafter, portions different from the outer skin 200 according to the present embodiment shown in FIGS. 2 and 3 will be described. Also, the same reference numerals are given to the same configurations, and the description of the common configurations will be omitted.

[0033] FIG. 6 is a cross-sectional view corresponding to the A-A' cross-sectional view of FIG. 1 of the heat insulating material according to still another embodiment, and FIG. 7 is a cross-sectional view corresponding to the B-B' cross-sectional view of FIG. 1 of the heat insulating material according to still another embodiment. As shown in FIGS. 6 and 7, the outer skin 200 according to still another embodiment is formed of two variable moisture permeable airtight sheets 200a and 200b. The fibrous heat insulating material 100 is superposed on the two variable moisture permeable airtight sheets 200a and 200b and sandwiched therebetween. The fibrous heat insulating material 100 is in contact with and covered by the variable moisture permeable airtight sheets 200a and 200b, but is not adhered (unadhered) to the variable moisture permeable airtight sheets 200a and 200b. Further, recesses are formed in the two variable moisture permeable airtight sheets 200a and 200b, and by superposing them so that the recesses of both face each other, a housing portion 200c of the outer skin 200 is formed. The fibrous heat insulating material 100 is housed in this housing portion 200c.

[0034] [Heat insulating material according to still another embodiment] Furthermore, the heat insulating material according to still another embodiment has an outer skin formed of a single variable moisture permeable airtight sheet, and two recesses are formed in the single variable moisture permeable airtight sheet. Hereinafter, portions different from the outer skin 200 according to the present embodiment shown in FIGS. 2, 3, 6, and 7 will be described. Also, the same reference numerals are given to the same configurations, and the description of the common configurations will be omitted.

[0035] FIG. 8 is a cross-sectional view corresponding to the cross-sectional view taken along line A-A' of FIG. 1 of the heat insulating material according to still another embodiment. The skin body 200 according to still another embodiment is formed of a single variable moisture permeability and airtight sheet 200a. As shown in FIG. 8, at a location (side) 200e extending in the length direction (Y direction) at one end in the width direction (X direction) of the heat insulating material 1000, a single variable moisture permeability and airtight sheet 200a is folded in half, and between them, the fibrous heat insulating material 100 is sandwiched. The fibrous heat insulating material 100 is in contact with and covered by the variable moisture permeability and airtight sheet 200a, but is not adhered (not adhered) to the variable moisture permeability and airtight sheet 200a. Further, recesses are formed in the upper and lower variable moisture permeability and airtight sheets, and by overlapping them so that the recesses of both face each other, the accommodating portion 200c of the skin body 200 is formed. The fibrous heat insulating material 100 is accommodated in this accommodating portion 200c.

[0036] [Manufacturing Method of the Heat Insulating Material According to the Present Embodiment] The manufacturing method of the heat insulating material of the present embodiment includes forming a fibrous heat insulating material having self-supporting properties by molding fibers, sandwiching the fibrous heat insulating material with a skin body formed of a variable moisture permeability and airtight sheet, and joining the skin bodies on the outer periphery of the fibrous heat insulating material to accommodate the fibrous heat insulating material in the skin body.

[0037] (Formation of the Fibrous Heat Insulating Material Having Self-Supporting Properties) The formation of the fibrous heat insulating material having self-supporting properties includes a fibrous aggregate forming step and a hardening step of the fibrous aggregate. First, in the fibrous aggregate forming step, a raw material (such as glass) having a chemical composition substantially the same as the chemical composition of the desired fibers is melted, and the melt is ejected by a spinner to produce fibers having an average fiber diameter of about 3 to 7 μm. As an example, by setting the melting temperature of the glass raw material to 1030 to 1100°C and the rotation speed of the spinner to 2200 to 2700 rpm, the glass fibers are three-dimensionally oriented (in addition to the planar entanglement of the glass fibers in the plane direction, the three-dimensional entanglement of the glass fibers in the height direction), and a fibrous heat insulating material of self-supporting glass fibers is formed.

[0038] Next, to the obtained fibers, a binder mainly composed of a natural-derived material that does not substantially release formaldehyde is added so that the content rate is about 3 to 13% by weight based on the total weight of the fiber aggregate, and the fibers are deposited while being sucked by a suction device on a conveyor. Also, as an example, instead of three-dimensionally orienting glass fibers, a self-supporting fibrous heat insulating material can also be formed by adding a known modifier with a binder content rate of 9.8% by weight or less.

[0039] Next, in the curing process of the fiber aggregate, the fiber aggregate is heated and cured with a binder in an oven to produce a fibrous heat insulating material. Depending on the type and content of the binder, the heating temperature is 180 to 300 °C and the heating time is 30 to 300 seconds for heat curing, and the fibrous heat insulating material is produced.

[0040] (Place the fibrous heat insulating material inside the skin body) The fibrous heat insulating material is placed at approximately the center of one skin body (variable moisture permeable airtight sheet), another variable moisture permeable airtight sheet is overlaid, and the fibrous heat insulating material is sandwiched between two variable moisture permeable airtight sheets. Also, when manufacturing the heat insulating materials shown in FIGS. 5 and 8, the fibrous heat insulating material is placed from approximately the center of the variable moisture permeable airtight sheet to one end, and the approximate center of the variable moisture permeable airtight sheet is folded in half to sandwich the fibrous heat insulating material 100.

[0041] (Joining of the skin body) In one embodiment, the variable moisture permeable airtight sheets located on the outer periphery of the fibrous heat insulating material are joined by heat welding. The heat welding temperature and heat welding time only need to be such that the variable moisture permeable airtight sheets can be heat welded, and can be adjusted according to the material of the variable moisture permeable airtight sheet. For example, the heat welding temperature of the variable moisture permeable airtight sheet is about 180 °C and the heat welding time is about 1 second as an example. Also, the location of heat welding can be the same as the location of the joint portion described in [the heat insulating material according to the present embodiment]. Thereby, the fibrous heat insulating material can be accommodated in the skin body.

[0042] In another embodiment, a variable moisture permeable airtight sheet located on the outer periphery of the fibrous heat insulating material is joined with an adhesive. For example, a hot melt adhesive can be used as the adhesive. The hot melt adhesive is heated to about 90°C and applied in an amount of about 4.0 g / cm 2 between the variable moisture permeable airtight sheets, and the variable moisture permeable airtight sheets are joined. The heating temperature and application amount of the hot melt adhesive only need to ensure that the variable moisture permeable airtight sheets are joined, and can be adjusted according to the hot melt adhesive and the material of the variable moisture permeable airtight sheet. Also, the bonding locations can be the same as those of the joints described in [the heat insulating material according to this embodiment]. Thereby, the fibrous heat insulating material can be housed in the skin body.

[0043] <Summary of the Embodiment> The disclosure of this specification includes the following heat insulating materials.

[0044] (Item 1) A fibrous heat insulating material, and a skin body formed of a variable moisture permeable airtight sheet and having a housing portion for housing the fibrous heat insulating material, wherein the fibrous heat insulating material is not adhered to the skin body and has self-supporting properties.

[0045] (Item 2) The heat insulating material according to Item 1, wherein the skin body is formed by overlapping two of the variable moisture permeable airtight sheets.

[0046] (Item 3) The heat insulating material according to Item 1 or Item 2, wherein the skin body includes a peripheral portion around the housing portion, and the peripheral portion has a joint portion where the variable moisture permeable airtight sheets are joined.

[0047] (Item 4) The heat insulating material according to any one of Items 1 to 3, wherein the joint portion is a portion where the variable moisture permeable airtight sheets are joined by heat fusion.

[0048] (Item 5) The heat insulating material according to any one of Items 1 to 3, wherein the joint portion is a portion where the variable moisture permeable airtight sheet is joined by a hot melt adhesive.

[0049] (Item 6) The heat insulating material according to any one of Items 1 to 5, wherein the fibrous heat insulating material is a molded body of glass fibers, and the glass fibers are three-dimensionally oriented.

[0050] Although the embodiments of the invention have been described above, the invention is not limited to the above embodiments, and various modifications and changes are possible within the scope of the gist of the invention.

Explanation of Reference Numerals

[0051] 100 Fibrous heat insulating material, 100a First main surface, 100b Second main surface, 100c Side surface, 200 Skin body, 200a, 200b Variable moisture permeable airtight sheet, 200c Accommodating portion, 200d Peripheral portion, 200e Side, 300a, 300b Joint portion, 400 Base

Claims

1. Fibrous insulation material; The insulation material is provided in a storage section, and the storage section has a surface formed of a variable moisture permeability sheet. The fiber-based insulating material is not bonded to the skin and has self-supporting properties.

2. The heat insulating material according to claim 1 , wherein the skin is formed by overlapping two of the variable moisture permeability and water tightness sheets.

3. The heat insulating material according to claim 1 , wherein the skin body includes a peripheral portion around the storage portion, and the peripheral portion has a joint portion where the variable moisture permeability and tightness sheet is joined.

4. The heat insulating material according to claim 3 , wherein the joint portion is a portion where the variably moisture-permeable and tight-tight sheet is joined by thermal fusion.

5. The heat insulating material according to claim 3 , wherein the joint portion is a portion where the variably moisture-permeable and tight-tight sheet is joined with a hot melt adhesive.

6. 2. The thermal insulation material according to claim 1, wherein the fiber-based thermal insulation material is a molded body of glass fibers, and the glass fibers are three-dimensionally oriented.

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