Heat insulation sheet

Abstract

To provide a heat insulation sheet which can suppress a damage of a package material layer while suppressing an outflow of powders from the heat insulation sheet.SOLUTION: A heat insulation sheet includes: one or more first dust emission layers that emit dust by an external force; and a package layer formed of a package film and covering the one or more first dust emission layers, the sheet satisfying the following formula (1). (In the formula, A: Young ratio (MPa) of the package film, B: rupture strength (MPa) of the package film, C: rupture elongation (%) of the package film, D: tensile strength (MPa) applied to the package film during compression, F: area (m2) of a heat insulation material including the first dust emission layer, G: nitrogen permeability (cm3 / (m2 day MPa)) of the package film, H: air permeability (cm3 / (cm2 s)) of a vent hole of the package layer, I: area of the vent hole (cm2), and J: thickness (mm) of the heat insulation material).SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a heat insulating sheet. [Background technology]

[0002] As an example of a heat insulating sheet, there is a heat insulating molded body in which a pressed support including an intermediate layer made of a highly dispersed ceramic material made of a metal oxide such as silicate aerogel and bearing layers made of ceramic paper, ceramic foil, or the like provided on both the upper and lower surfaces of the intermediate layer is covered with a shrinkable plastic film (for example, see Patent Document 1).

[0003] The intermediate layer is formed by molding metal oxide powder, and the surface of the intermediate layer is rough and prone to parts of the surface crumbling, a phenomenon known as powder falling off. Therefore, in the heat-insulating molded body of Patent Document 1, the support including the intermediate layer is covered with a plastic film to prevent the metal oxide from leaking out even if it peels off from the surface of the intermediate layer. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] European Patent Application Publication No. 5792540 Summary of the Invention [Problem to be solved by the invention]

[0005] However, the heat insulating molded body of Patent Document 1 has a problem that when the heat insulating molded body is placed in an environment with a different air pressure from the air pressure when the support is covered with the plastic film and packaged, the inside of the plastic film is reduced in pressure due to the difference in air pressure between the inside and outside of the plastic film, which causes the plastic film to expand and easily break or burst. Also, when the plastic film is compressed by an external force, the plastic film is easily broken or burst.

[0006] If a vent is provided in a plastic film to prevent damage or rupture of the plastic film, there is a possibility that the metal oxide powder constituting the intermediate layer will flow out through the vent due to powder falling off of the intermediate layer. In order to use an insulation sheet with a vent provided in a packaging material layer covering a member that is prone to generating dust such as powder falling off when subjected to external stress, such as an insulation material made of molded metal oxide powder, in applications where soot and dust are undesirable, such as in clean environments with almost no soot and dust, it is important that the metal oxide powder does not flow out from the packaging material layer.

[0007] An object of one aspect of the present invention is to provide a heat insulating sheet that can prevent powder from leaking out of the heat insulating sheet and can also prevent damage to the packaging material layer. [Means for solving the problem]

[0008] One aspect of the heat insulating sheet according to the present invention is one or more first dust-generating layers that generate dust when an external force is applied; a packaging material layer formed of a packaging film and covering one or more of the first dust-generating layers; Equipped with The following formula (1) is satisfied.

[0009]

number

[0010] One aspect of the heat insulating sheet according to the present invention can prevent powder from leaking out of the heat insulating sheet and can also prevent damage to the packaging material layer. [Brief description of the drawings]

[0011] [Figure 1] 1 is a perspective view of a heat insulating sheet according to an embodiment of the present invention. [Diagram 2] FIG. 2 is a cross-sectional view of FIG. [Diagram 3] FIG. 2 is a plan view of FIG. [Figure 4] FIG. 4 is a cross-sectional view showing an example of another configuration of the heat insulating sheet. [Diagram 5] FIG. 11 is a plan view showing an example of another configuration of the heat insulating sheet. [Figure 6] FIG. 6 is a cross-sectional view taken along line II-II of FIG. 5. [Figure 7] FIG. 4 is a cross-sectional view showing an example of another configuration of the heat insulating sheet. [Figure 8] FIG. 4 is a cross-sectional view showing an example of another configuration of the heat insulating sheet. [Figure 9] FIG. 11 is a plan view showing an example of another configuration of the heat insulating sheet. [Figure 10] FIG. 4 is a cross-sectional view showing an example of another configuration of the heat insulating sheet. [Figure 11] FIG. 4 is a cross-sectional view showing an example of another configuration of the heat insulating sheet. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] Hereinafter, the embodiments of the present invention will be described in detail. In order to facilitate understanding of the description, the same components in each drawing are given the same reference numerals, and duplicated descriptions will be omitted. In addition, the scale of each member in the drawings may differ from the actual scale. In this specification, "~" indicating a numerical range means that the numerical values ​​before and after it are included as the lower and upper limits, unless otherwise specified.

[0013] <Thermal insulation sheet> The heat insulating sheet according to an embodiment of the present invention will be described. Fig. 1 is a perspective view of the heat insulating sheet according to this embodiment, Fig. 2 is a cross-sectional view of Fig. 1, and Fig. 3 is a plan view of Fig. 1. As shown in Figs. 1 and 2, the heat insulating sheet 1A according to this embodiment includes a heat insulating material 10 and a packaging material layer 20 that covers the heat insulating material 10. The heat insulating sheet 1A is formed in a sheet shape, and as shown in Fig. 3, is formed into a substantially rectangular shape in a plan view.

[0014] In this specification, the thickness (vertical) direction of the heat insulating sheet 1A is defined as the Z-axis direction, and the lateral (horizontal) direction perpendicular to the thickness direction is defined as the X-axis direction and the Y-axis direction. The first dust-generating layer 11 side in the Z-axis direction is defined as the +Z-axis direction, and the second dust-generating layer 12 side is defined as the -Z-axis direction. In the following description, for convenience of explanation, the +Z-axis direction is referred to as up or upward, and the -Z-axis direction is referred to as down or downward, but this does not represent a universal up-down relationship.

[0015] The heat insulating sheet 1A is configured to satisfy the following formula (1).

[0016]

number

[0017] The Young's modulus (tensile elastic modulus) of the packaging film is determined by measuring in an environment of 25°C and 50% RH based on a method conforming to JIS-K-7161. The pulling speed of the packaging film can be appropriately set depending on the type of material constituting the packaging film, the size of the packaging film, etc., and may be, for example, 5 mm / min.

[0018] The breaking strength of the packaging film is determined by measuring at 25°C and 50% RH in accordance with a method conforming to JIS K 7127 or JIS C 2318-72. The compression speed can be appropriately set depending on the type of material constituting the packaging film, the size of the packaging film, etc., and may be, for example, 5 mm / min.

[0019] The breaking elongation of the packaging film is measured in an environment of 25°C and 50% RH based on a method conforming to JIS K 7127 or JIS C 2318-72, and the gage length L of the broken packaging film at the time of breaking is calculated by multiplying the gage length L of the original packaging film by the following formula (I). 0 The tensile elongation of the packaging film can be calculated by dividing the value by the formula (II) and expressing it as a percentage. The tensile elongation of the packaging film can be calculated by the following formula (II). The pulling speed when measuring the tensile elongation can be appropriately set depending on the type of material constituting the packaging film, the size of the packaging film, etc., and may be, for example, 5 mm / min. Breaking elongation (%) = L / L 0 ×100 (I) Tensile elongation (%) = (LL 0 ) / L 0 ×100 (II)

[0020] The tensile strength (MPa) applied to the packaging film during compression is calculated from the following formula (II). D = (151987.5 × F 0.5 ) / E···(II) (where D is the tensile strength (MPa) applied to the packaging film when compressed, E is the thickness of the packaging film (μm), and F is the area of ​​the insulation material (m 2 )

[0021] That is, D is calculated by multiplying the pressure P and the volume V when not pressurized using Boyle's law (PV=R) (P (非加圧) ×V (非加圧) ) is the value (P) obtained by multiplying the pressure P and the volume V when the main surface of the packaging film is compressed by 60% (60% compression deformation) (60%圧縮変位) ×V (60%圧縮変位) ) is equal to (P (非加圧) ×V (非加圧) =P (60%圧縮変位) ×V (60%圧縮変位) The pressure applied to the packaging film at 60% compression deformation (P) is calculated by multiplying the pressure P and volume V when no pressure is applied and the pressure P and volume V when 60% compression deformation is applied. (60%圧縮変位) ) is represented by the following formula (III). P (60%圧縮変位) =(P (非加圧) ×V (非加圧) ) / V (60%圧縮変位) (III) The pressure at 1 atmosphere is 0.101325 MPa, so P (60%圧縮変位) From the above formula (III), the pressure applied to the packaging film is the displacement, P (60%圧縮変位) From P (非加圧) The value obtained by subtracting (P (60%圧縮変位) -P (非加圧) ), the tensile strength D applied to the packaging film during compression is calculated as follows: (II) multiply the pressure applied to the packaging film (0.1519875 MPa) by the square root of the area F of the heat insulating material 10 (i.e., the length of one side of the packaging film), and divide the result by the thickness E of the packaging film. 6 Multiplying by , the thickness E of the packaging film in μm and the area F of the insulation in m 2 ) can be obtained by combining

[0022] Area of ​​insulation material 10 (m 2 ) can be obtained by measuring the lengths of two sides of the insulation material 10 using a measuring tool such as a ruler and calculating the area of ​​the main surface of the insulation material 10.

[0023] The nitrogen permeability of packaging films can be measured using a differential pressure gas chromatography method in accordance with JIS K 7126-1 "Plastics - Films and sheets - Gas permeability test methods - Part 1: Differential pressure method."

[0024] The air permeability of the vent hole of the packaging material layer 20 can be measured in an environment of 25°C and 50% RH using a Frazier type testing machine based on a method conforming to JIS L 1096. For example, the packaging material layer 20 has a predetermined size (200 mm x 200 mm), and air is sucked in to a pressure of 125 kPa, and the air permeability is measured by measuring the air flow rate at that time.

[0025] Vent area (cm 2 ) can be calculated using a general area calculation method depending on the shape of the ventilation opening.

[0026] The thickness of the insulating material 10 is determined by measuring a cross section of the insulating material 10 .

[0027] In this embodiment, the thickness of the thermal insulation material 10 is the thickness measured at any location on the cross section of the thermal insulation material 10. When measurements are taken at several locations on the cross section of the thermal insulation material 10, the thickness may be the average value of the thicknesses measured at these measurement locations.

[0028] It is preferable that the heat insulating sheet 1A satisfies the following formula (2).

[0029]

number

[0030] The above formula (2) represents the volumetric gas movement amount (cm) per second when the heat insulating sheet 1A having the heat insulating material in the packaging material layer is compressed. 3 / sec), (area of ​​heat insulation material including the first dust-generating layer F × nitrogen permeability of packaging film G / (24 hours × 60 minutes × 60 seconds) + air permeability of the vent hole of the packaging material layer H × area of ​​the vent hole I) are calculated based on the composition of the heat insulation material, packaging material layer and porous film, and the volume movement amount (cm 3 / This rate is calculated by dividing {(F×100×100×J÷10×60%)÷60 seconds} by the ratio of F×100×100×J÷10×60%÷60 seconds}. In other words, formula (2) is the threshold value at which the powder does not flow out and the packaging layer does not burst even if the configuration of the heat insulating material 10, the packaging material layer 20 and the porous membrane 30 and the main surface of the heat insulating sheet 1A are compressed and deformed by 60% in less than half a minute, i.e., in less than 30 seconds.

[0031] The present inventor, in considering how to prevent powder from peeling off a part of the first dust-generating layer 11 from leaking out from a heat insulating sheet 1A having the first dust-generating layer 11 and a packaging material layer 20 having a vent hole, discovered that there is a correlation between the strength and air permeability of the heat insulating sheet 1A, the outflow of powder caused by powder falling off the first dust-generating layer 11, and damage or rupture of the packaging material layer 20. The present inventor then focused on the relationship between the strength and air permeability of the heat insulating sheet 1A, the outflow of powder caused by powder falling off the first dust-generating layer 11, and the occurrence of damage or rupture of the packaging material layer 20. The present inventor then discovered that if the above formula (1) is satisfied, the heat insulating sheet 1A can prevent at least powder caused by peeling off a part of the first dust-generating layer 11 from leaking out and can prevent damage or rupture of the packaging material layer 20 even when a force is applied from the outside.

[0032] Each member constituting the heat insulating sheet 1A will now be described.

[0033] [Thermal insulation] The heat insulating material 10 is a laminate including a first dust-generating layer 11 and a second dust-generating layer 12, which are laminated in this order.

[0034] (First dust layer) 2, the first dust-generating layer 11 is formed in a sheet shape and generates dust when an external force is applied from the outside. The first dust-generating layer 11 has a function of suppressing the heat transmitted to the heat insulating material 10 from being transmitted in the thickness direction, i.e., has heat insulating properties, and may have any appropriate softness and cushioning properties.

[0035] In this embodiment, dust refers to powder produced when part of the surface of the first dust-generating layer 11 crumbles, i.e., powder falling, or soot produced when particles constituting the first dust-generating layer 11 inside the first dust-generating layer 11 are deformed or damaged due to external stress being applied to the first dust-generating layer 11.

[0036] The first dust layer 11 has a lower thermal conductivity than the second dust layer 12. The thermal conductivity of the first dust layer 11 is not particularly limited as long as it is lower than the thermal conductivity of the second dust layer 12 at 80°C and 2 MPa, but the thermal conductivity of the first dust layer 11 at 23°C is preferably 0.3 W / (m·K) or less. If the thermal conductivity of the first dust layer 11 is equal to or less than the above upper limit, the first dust layer 11 can exhibit heat insulation. The lower limit of the thermal conductivity of the first dust layer 11 is not limited, and may be, for example, 0.010 W / K·m or more.

[0037] The thermal conductivity of the first dust layer 11 at 80° C. and 2 MPa can be measured by a method conforming to “JIS A 1412-1:2016 Measurement method for thermal resistance and thermal conductivity of thermal insulation materials-Part 2: Heat flow meter method (HFM method)”.

[0038] The thermal resistance of the first dust-generating layer 11 is not particularly limited, but is preferably 0.025 (K·m 2 ) / W or more. The upper limit of the thermal resistance of the first dust-generating layer 11 is not limited, and is, for example, 0.1 (K·m 2 ) / W or less.

[0039] The first dust-generating layer 11 is not particularly limited as long as it is a molded body that generates dust and has the desired heat insulating properties, and may be a porous body having internal voids or a foamed porous body having internal voids, and it is preferable that the first dust-generating layer 11 is a porous body.

[0040] The porous body may be produced by either a dry method or a wet method.

[0041] The porous body may contain inorganic particles. The porous body may be formed by compression molding of a mixture of inorganic particles and a binder.

[0042] The inorganic particles may be particles capable of suppressing thermal radiation. The inorganic particles may be any particles capable of reducing heat transfer due to radiation, and the inorganic particles preferably have an absorption peak in the infrared region, for example. The absorption peak in the infrared region can be measured by an infrared spectrophotometer. The inorganic particles may function as a binder for binding fibers together. When the porous body contains inorganic particles, the porous body may be formed by compression molding of a mixture containing inorganic particles and fibers.

[0043] The inorganic particles may be made of silica, titanium oxide, silicon carbide, ilmenite (FeTiO), zirconium silicate, iron(III) oxide, iron(II) oxide (wustite (FeO), magnetite (Fe 3 O 4 ), Hematite (Fe 2 O 3 )), chromium dioxide, zirconium oxide, manganese dioxide, zirconia sol, titania sol, silica sol, alumina sol, bentonite, kaolin, etc. The inorganic particles may be used alone or in combination of two or more kinds.

[0044] When the inorganic particles are silica particles made of silica, examples of the silica include silica produced by a dry method and silica produced by a wet method. Examples of silica produced by a dry method include fumed silica. Examples of silica produced by a wet method include colloidal silica and silica gel. Examples of colloidal silica include anionic colloidal silica and cationic colloidal silica. As the silica gel, it is preferable to use silica aerogel, silica xerogel, etc., which have extremely low density. Silica aerogel and silica xerogel are silica gels with a high ratio of voids to the volume, generally 90% or more, and with a porous structure of several tens of nm. Silica aerogel and silica xerogel have little heat transfer due to conduction of the solid part, and the movement of the molecules of the air component inside is hindered, so that they have little conduction and convection due to gas, and have low thermal conductivity.

[0045] The average primary particle size of the dry silica or wet silica can be appropriately designed, and is, for example, preferably 1 nm to 20 nm, more preferably 3 nm to 18 nm, and even more preferably 8 nm to 15 nm. If the average primary particle size is within the above preferred range, the dry silica or wet silica can exhibit the function of suppressing heat transfer.

[0046] The average primary particle size is measured by an electron microscope such as a transmission electron microscope (TEM). The hydrophilic fumed silica 11 is observed using an electron microscope such as a TEM, and the primary particle size is determined by using the diameter if the hydrophilic fumed silica 11 is a spherical particle, the intermediate value between the short axis and the long axis if the hydrophilic fumed silica 11 is an elliptical particle, and the intermediate value between the short side and the long side if the hydrophilic fumed silica 11 is an amorphous particle. Then, a particle size distribution of the hydrophilic fumed silica 11 is created, and the average particle size is determined based on the particle size distribution. This average value may be the average particle size of the hydrophilic fumed silica 11.

[0047] The average particle size of the inorganic particles can be appropriately selected depending on the type of inorganic particles, the size of the first dust-generating layer 11, and the like, and is preferably, for example, 1 μm to 1000 μm.

[0048] The average particle size means the volume average particle size based on the effective diameter, and refers to the particle size distribution of inorganic particles that can exist in a stable state, for example, the secondary aggregate structure in the case of dry silica, and the particle size of the crushed powder of the aggregates of primary particles in the case of wet silica or aerogel powder. The average particle size is the particle size (median size) when the integrated amount accumulates from the smallest particles to 50% by volume in a particle size distribution curve obtained by measuring the particle size distribution of particles using, for example, laser diffraction / scattering method or dynamic light scattering method.

[0049] The shape of the inorganic particles is not particularly limited, and may be, for example, spherical, ellipsoidal, spindle-like, crushed, plate-like, columnar, or the like.

[0050] Examples of the binder include thermoplastic resins, thermosetting resins, and sugars. These may be used alone or in combination of two or more. The content of the binder in the fibrous body is not particularly limited as long as it is within a range in which heat insulating properties can be exhibited, and may be set to any appropriate content.

[0051] The porous body preferably further contains fibers. In this case, the porous body can be formed of a compression molded body made of a mixture of inorganic particles, fibers and a binder.

[0052] The fibers contained in the porous body are not particularly limited as long as they can be applied to the first dust-generating layer 11, and at least one of inorganic fibers and organic fibers may be used, but it is preferable that the porous body contains inorganic fibers.

[0053] The inorganic fibers are not particularly limited, and examples thereof include silica fibers, glass fibers, alumina fibers, silica-alumina fibers, silica-alumina-magnesia fibers, biosoluble inorganic fibers, glass fibers, zirconia fibers, alkaline earth silicate fibers, alkaline earth silicate (AES) wool, glass wool, rock wool, and basalt fibers, etc. These may be used alone or in combination of two or more.

[0054] The organic fibers are not particularly limited, and examples thereof include aramid fibers, polyester fibers, polyethylene fibers, polypropylene fibers, polyvinyl chloride fibers, fluorine resin fibers, nylon fibers, rayon fibers, acrylic fibers, polyolefin fibers, etc. These may be used alone or in combination of two or more.

[0055] The average fiber length of the fibers is not particularly limited as long as it can exhibit heat insulating properties, and is preferably, for example, 0.05 mm to 50 mm.

[0056] The average fiber diameter of the fibers is not particularly limited as long as it can exhibit heat insulating properties, and is preferably, for example, 0.1 μm to 50 μm.

[0057] The fiber content in the porous body constituting the first dust-generating layer 11 is not particularly limited as long as it is within a range in which dust generation and heat insulation can be exhibited, and is preferably, for example, 70% by mass to 99.5% by mass. When the fibers include inorganic fibers and organic fibers, the fiber content in the porous body is the sum of the inorganic fiber content and the organic fiber content.

[0058] Examples of the foamed porous body include urethane foam, phenol foam, polyethylene terephthalate foam, polystyrene foam, and silicone foam.

[0059] The foamed porous body may contain inorganic particles, similar to the porous body. The inorganic particles may be the same as those contained in the porous body, so details of the inorganic particles are omitted. The content of the inorganic particles contained in the fibrous body may be set appropriately.

[0060] The density of the first dust-generating layer 11 is not particularly limited, and is, for example, 0.20 g / cm 3 ~0.45g / cm 3 It is acceptable to do so.

[0061] The porosity of the foamed porous body according to the Archimedes method is not particularly limited and can be set appropriately, but in order to ensure the heat insulating properties of the first dust-generating layer 11, it is preferable that it is, for example, 30% to 90%.

[0062] The shape of the first dust-generating layer 11 can be appropriately selected according to the application of the heat insulating sheet 1A and is not particularly limited as long as it is a shape suitable for insulating the surface of the installation surface, but is preferably a plate shape, for example. In this case, the shape of the first dust-generating layer 11 in a plan view may be a rectangle (e.g., a polygon such as a square) as shown in Fig. 3, or may be a circle, an ellipse, or other shape.

[0063] The thickness of the first dust-generating layer 11 can be appropriately set, but is preferably, for example, 0.8 mm to 5.0 mm. If the thickness of the first dust-generating layer 11 is within the above preferred range, the heat insulating property can be improved and the heat insulating sheet 1A can be prevented from becoming large.

[0064] (Second dust layer) 2, the second dust-generating layer 12 is provided on an upper surface 11a of the first dust-generating layer 11. The second dust-generating layer 12 may be a single layer, or may be a laminate of two or more layers. The second dust-generating layer 12 is formed in a sheet shape, and is a layer that generates less dust than the first dust-generating layer 11 when an external force is applied from the outside.

[0065] In addition, generating less dust than the first dust-generating layer 11 means that no dust is generated even when external stress is applied, or even if dust is generated, the amount of dust generated is less than that of the first dust-generating layer 11, and thus the dust generation is lower than that of the first dust-generating layer 11.

[0066] The second dust layer 12 may be formed to have any appropriate softness depending on the hardness of the first dust layer 11. That is, the second dust layer 12 may be more easily deformed by compression than the first dust layer 11, or may be less easily deformed by compression than the first dust layer 11, depending on the hardness of the first dust layer 11.

[0067] The thermal conductivity of the second dust layer 12 at 80° C. and 2 MPa may be higher than the thermal conductivity of the first dust layer 11 at 80° C. and 2 MPa, and is preferably, for example, 0.04 W / (m·K) to 0.4 W / (m·K).

[0068] The thermal conductivity of the second dust layer 12 at 80° C. and 2 MPa is preferably 20% or more of the thermal conductivity of the first dust layer 11 at 80° C. and 2 MPa. The thermal conductivity of the second dust layer 12 can be measured in the same manner as the thermal conductivity of the first dust layer 11.

[0069] The material of the second dust-generating layer 12 is preferably one that is easily compressively deformed and can exhibit cushioning properties. As the second dust-generating layer 12, for example, the same porous body, fiber, rubber, thermoplastic resin molded body, etc. as the first dust-generating layer 11 described above can be used.

[0070] The fiber molded body (fiber molded body) can be obtained by molding fibers. Examples of the fibers include inorganic fibers such as glass wool and rock wool, cellulose fibers, and felts made of polyester and polypropylene. When the compressive elastic modulus of the second dust-generating layer 12 is set within a range of 0.3 MPa to 8.0 MPa, the mass of the fibers used to form the second dust-generating layer 12 is 140 kg / m 3 ~400kg / m 3 It is preferable that the fiber is glass wool that has been cured with a thermosetting resin in order to increase the compressive elastic modulus. It is preferable that the glass wool itself has a fiber diameter of 3 μm to 13 μm and a fiber length of 5 mm to 200 mm.

[0071] A rubber molded body (rubber molded body) is obtained by molding rubber. Examples of rubber include styrene butadiene rubber, butadiene rubber, chloroprene rubber, isoprene rubber, butyl rubber, ethylene propylene rubber, nitrile rubber, silicone rubber, fluororubber, acrylic rubber, urethane rubber, polysulfide rubber, and epichlorohydrin rubber. These may be used alone or in combination of two or more. The Asker C hardness of the rubber molded body is preferably 53 or less. If the Asker C hardness is higher than 53, there is a possibility that the heat insulating layer will be destroyed during compression. The Asker C hardness is measured using an Asker rubber hardness tester type C indenter based on the hardness measuring method described in JIS K7312:1996.

[0072] A thermoplastic resin molded article (resin molded article) can be obtained by molding a thermoplastic resin or a thermosetting resin.

[0073] Examples of the thermoplastic resin include polyurethane, polyethylene, polystyrene, polypropylene, ethylene-vinyl acetate copolymer, etc. These may be used alone or in combination of two or more.

[0074] Examples of the thermosetting resin include urethane resin, phenol resin, urea resin, melamine resin, unsaturated polyester, epoxy resin, silicone resin, etc. These may be used alone or in combination of two or more kinds.

[0075] Among the above-mentioned thermoplastic resins and thermosetting resins, foamed resins (foamed plastics) can be used. Examples of foamed resins include polyolefin resins such as polyethylene and polypropylene, polystyrene resins such as polyvinyl chloride resin (PVC), and polyurethane resins such as polyurethane resin, resol-type phenolic resins such as phenolic ribbon resin (PF), melamine resins such as melamine resin (MF), and epoxy resins such as epoxy resin (EP).

[0076] The resin molded body is preferably a resin foam formed by foam molding using the above-mentioned thermoplastic resin to form closed or continuous cells. Since the resin foam has cells inside and on the surface, it is easily compressively deformed and can exhibit cushioning properties.

[0077] In order to set the compressive elastic modulus of the resin foam within the range of 0.3 MPa to 8.0 MPa, it is preferable that the cell structure constituting the resin foam is a closed cell structure, the material used to form the resin foam has a cross-linked structure, and the material alone has a compressive elastic modulus of 700 MPa to 72,000 MPa. In order to set the compressive elastic modulus of the resin foam within the range of 0.3 MPa to 8.0 MPa, it is preferable that the reinforcing structure of the resin foam is a wave type that disperses stress and is less likely to buckle, rather than a square cross-sectional shape in which stress is likely to concentrate.

[0078] In order to prevent the heat insulating property of the second dust-generating layer 12 from being deteriorated, the second dust-generating layer 12 preferably has flame retardancy (for example, UL94 V-0 of the UL flame retardant standard), and more preferably has non-combustibility.

[0079] The thickness of the second dust-generating layer 12 is preferably 1.0 mm to 8.8 mm, more preferably 1.5 mm to 7.5 mm, and even more preferably 2.0 mm to 5.0 mm. If the thickness of the second dust-generating layer 12 is 1.0 mm to 8.8 mm, even if stress is applied to the heat insulating sheet 1A from the outside, the second dust-generating layer 12 can sufficiently absorb the stress applied from the outside and can suppress dust generation from the second dust-generating layer 12.

[0080] The shape of the second dust-generating layer 12, like the first dust-generating layer 11, can be appropriately selected according to the application of the heat insulating sheet 1A and is not particularly limited as long as it is a shape suitable for deforming in response to deformation such as expansion and contraction of the installation surface, but is preferably, for example, a plate shape. In this case, the shape of the second dust-generating layer 12 in a plan view may be rectangular (for example, a polygon such as a square), circular, elliptical, or other shapes.

[0081] [Packaging material layer] As shown in Figs. 1 and 2, the packaging material layer 20 covers the surfaces of the heat insulating material 10 (i.e., the surfaces of the first dust-generating layer 11 and the second dust-generating layer 12 exposed to the outside) and contains the heat insulating material 10 in a sealed state inside. When the first dust-generating layer 11 or the second dust-generating layer 12 constituting the heat insulating material 10 is a laminate of one or more layers, the packaging material layer 20 covers one or more of the first dust-generating layer 11 or the second dust-generating layer 12. By covering the heat insulating material 10 with the packaging material layer 20, even if the first dust-generating layer 11 contained in the heat insulating material 10 contains inorganic particles such as silica particles, the inorganic particles are prevented from falling off from the cross section of the first dust-generating layer 11 and flowing out to the outside. Note that the packaging material layer 20 may cover only the first dust-generating layer 11.

[0082] It is preferable that the packaging material layer 20 covers at least one of the first dust-generating layer 11 and the second dust-generating layer 12 in a non-bonded state.

[0083] 2, the packaging material layer 20 can be formed by welding or adhering the peripheral edges of a pair of sheet-shaped packaging films 21A and 21B. Alternatively, the packaging material layer 20 may be formed by folding back one of the packaging films 21A or 21B and welding or adhering the peripheral edges.

[0084] The packaging material layer 20 has a seal portion 22 formed by overlapping a pair of packaging films 21A and 21B facing each other and welding or bonding their outer peripheral edges together, and the heat insulating material 10 can be contained in a sealed state within a space defined by the pair of packaging films 21A and 21B and the seal portion 22. From the viewpoint of ease of forming the seal portion 22, it is preferable to form the seal portion 22 so as to protrude outside the packaging material layer 20.

[0085] The sealed portion 22 may be formed integrally with the packaging films 21A and 21B and made of the same material as the packaging films 21A and 21B, or may be formed separately from the packaging films 21A and 21B and made of a different material from the packaging films 21A and 21B. When the sealed portion 22 is made of a different material from the packaging films 21A and 21B, the sealed portion 22 may be composed of a heat seal layer described later.

[0086] The packaging films 21A and 21B may have a layer made of polyethylene terephthalate (PET), polybutylene terephthalate (PBT) or polyimide (PI) or flame-retardant polycarbonate (PC), or breathable porous polyethylene (PE) having a molecular weight of 1 to 7 million, or flame-retardant polyethylene (PE) or biaxially oriented nylon film (Ny) film.

[0087] The packaging films 21A and 21B may further have a heat seal layer made of a heat seal resin on the surface to be bonded to the sealed portion 22. The heat seal layer may be provided at least in the sealed portion 22 of the packaging films 21A and 21B.

[0088] Examples of heat seal resins include polyethylene (PE) and polypropylene (PP).

[0089] It is preferable that the packaging films 21A and 21B have only a layer made of a PET film, or are a laminate of a layer made of a PET film and a layer made of a heat seal resin.

[0090] The thickness of the packaging material layer 20 is not particularly limited and may be set to any appropriate thickness.

[0091] In the packaging material layer 20, at least the peripheral edges of the packaging films 21A and 21B are preferably joined by any one of heat welding, heat cutting, ultrasonic welding, ultrasonic cutting, hot melt resin, adhesive, and adhesive tape.

[0092] The weld strength of the joint between the joined packaging material layers 20 is preferably greater than the breaking strength of the packaging material layers 20 .

[0093] The wrapper layer 20 preferably has one or more ventilation holes 23 .

[0094] 2, the packaging material layer 20 preferably has an air vent 23 in the packaging film 21A. The air vent 23 is provided in the surface of the packaging film 21A that contacts the first dust-generating layer 11 and the second dust-generating layer 12. One air vent 23 is provided in the packaging film 21A, but two or more air vents 23 may be provided.

[0095] The area of ​​the vent hole 23 may be set to any appropriate size, for example, 0.000079 cm 2 It is preferable that the value is equal to or greater than 0.0079 cm. 2 The upper limit of the area of ​​the ventilation hole 23 is not particularly limited, but from the viewpoint of cost, it is preferably 10 cm 2 The following is preferred:

[0096] The ventilation hole 23 is preferably covered with a porous membrane 30. The porous membrane 30 may be formed in a sheet shape, and may be formed in a rectangular, circular, or other shape in a plan view.

[0097] The air permeability of the porous membrane 30 is 4 cm 3 / (cm 2 s) or more is preferable, and 7 cm 3 / (cm 2 s) or more is preferable, and 21 cm 3 / (cm 2 The upper limit of the air permeability of the porous film 30 is not particularly limited, but from the viewpoint of preventing the outflow of powder, it is preferably 500 cm 3 / (cm 2 Less than s) is preferred.

[0098] As the porous membrane 30, a general porous membrane can be used.

[0099] Thus, the heat insulating sheet 1A according to this embodiment includes the first dust-generating layer 11 and the packaging material layer 20, and satisfies the above formula (1). The above formula (1) is used as an index of the strength and breathability of the heat insulating sheet 1A. By satisfying the above formula (1), the heat insulating sheet 1A can satisfy both strength and breathability, and therefore, even when stress is applied from the outside, powder falling from the first dust-generating layer 11 can be suppressed and the packaging material layer 20 can be suppressed from being damaged or burst. Therefore, the heat insulating sheet 1A can suppress the powder generated from the first dust-generating layer 11 from flowing out of the heat insulating sheet 1A and suppress damage to the packaging material layer 20.

[0100] The heat insulating sheet 1A can satisfy the above formula (2). Since the above formula (2) is an index of the breathability of the heat insulating sheet 1A, when the heat insulating sheet 1A satisfies the above formula (2), the packaging material layer 20 can be made less susceptible to damage or rupture even when stress is applied from the outside. Thus, the heat insulating sheet 1A can more reliably prevent damage or rupture of the packaging material layer 20.

[0101] The heat insulating sheet 1A may contain silica particles in the first dust-generating layer 11. The silica particles can be used as inorganic particles when the first dust-generating layer 11 is made of a porous body. By making the first dust-generating layer 11 of a porous body containing silica particles, the first dust-generating layer 11 can have a high porosity and low thermal conductivity. Therefore, the heat insulating sheet 1A can improve the heat insulating property of the first dust-generating layer 11, and can exhibit high heat insulating property.

[0102] The heat insulating sheet 1A can further contain inorganic fibers in the first dust-generating layer 11. By containing inorganic fibers in addition to silica particles, the first dust-generating layer 11 can further increase the porosity of the first dust-generating layer 11 and maintain a low thermal conductivity. Therefore, the heat insulating sheet 1A can further improve the heat insulating property of the first dust-generating layer 11, and can stably exhibit even higher heat insulating property.

[0103] The heat insulating sheet 1A can be arranged so that the packaging material layer 20 is not adhered to the first dust-generating layer 11. The heat insulating sheet 1A can easily encase the first dust-generating layer 11 within the packaging material layer 20. Furthermore, even if the packaging material layer 20 is deformed due to the application of external stress to the packaging material layer 20, the heat insulating sheet 1A can suppress the deformation of the first dust-generating layer 11 in response to the deformation of the packaging material layer 20. Therefore, the heat insulating sheet 1A can suppress damage to the first dust-generating layer 11 and further suppress the occurrence of powder falling.

[0104] The heat insulating sheet 1A has a second dust-generating layer 12, which can be covered with a packaging material layer 20. Even when the heat insulating sheet 1A has the second dust-generating layer 12, by covering the second dust-generating layer 12 with the packaging material layer 20, even if part of the surface of the second dust-generating layer 12 peels off and powder falls from the second dust-generating layer 12, it is possible to prevent the powder of the second dust-generating layer 12 from flowing out to the outside. Therefore, even when the heat insulating sheet 1A has the first dust-generating layer 11 and the second dust-generating layer 12, it is possible to prevent the powder from flowing out.

[0105] In the heat insulating sheet 1A, the second dust-generating layer 12 can have a porous body. This allows the second dust-generating layer 12 to have a high porosity and low thermal conductivity. Therefore, the heat insulating sheet 1A can improve the heat insulating property of the second dust-generating layer 12, and can exhibit high heat insulating property.

[0106] The heat insulating sheet 1A can form the second dust-forming layer 12 containing inorganic fibers and a binder. This allows the second dust-forming layer 12 to be formed of a compression molded body containing inorganic particles, inorganic fibers, and a binder, making it easier to increase the porosity of the second dust-forming layer 12 and maintaining a low thermal conductivity. Therefore, the heat insulating sheet 1A can further improve the heat insulating property of the second dust-forming layer 12, and can stably exhibit even higher heat insulating property.

[0107] The heat insulating sheet 1A can be formed by including a foamed resin in the second dust-generating layer 12. Even in this case, the second dust-generating layer 12 can have a higher porosity and a lower thermal conductivity. Therefore, the heat insulating sheet 1A can easily improve the heat insulating property of the second dust-generating layer 12, and can reliably and stably exhibit even higher heat insulating property.

[0108] The heat insulating sheet 1A can be arranged so that the packaging material layer 20 is not adhered to the second dust-generating layer 12. The heat insulating sheet 1A can easily encase the second dust-generating layer 12 within the packaging material layer 20. Furthermore, even if the packaging material layer 20 is deformed due to the application of external stress to the packaging material layer 20, the heat insulating sheet 1A can suppress the deformation of the second dust-generating layer 12 in response to the deformation of the packaging material layer 20. Thus, the heat insulating sheet 1A can suppress damage to the second dust-generating layer 12 and further suppress the occurrence of powder falling, thereby suppressing the outflow of powder from the second dust-generating layer 12.

[0109] The heat insulating sheet 1A can have an air vent 23 in the packaging material layer 20. This makes it difficult for a pressure difference to occur between the inside and outside of the packaging material layer 20, making it difficult for the packaging material layer 20 to expand. Therefore, the heat insulating sheet 1A can prevent the packaging material layer 20 from expanding and causing damage or bursting.

[0110] The heat insulating sheet 1A can be provided with an air vent 23 on the surface where the packaging material layer 20 comes into contact with the second dust-generating layer 12. Since the dust-generating property of the second dust-generating layer 12 is lower than that of the first dust-generating layer 11, by providing the air vent 23 on the surface where the second dust-generating layer 12 comes into contact with the heat insulating sheet 1A, the outflow of powder to the outside can be further suppressed, and damage or bursting due to expansion of the packaging material layer 20 can be suppressed.

[0111] The heat insulating sheet 1A reduces the area of ​​the vent hole 23 to 0.000079 cm 2 This makes it possible to more reliably prevent the occurrence of a pressure difference between the inside and outside of the packaging material layer 20, and therefore the heat insulating sheet 1A can reliably prevent the packaging material layer 20 from expanding and being damaged or bursting.

[0112] The heat insulating sheet 1A can cover the ventilation hole 23 with the porous film 30. This allows the heat insulating sheet 1A to prevent powder generated from the first dust-generating layer 11 or the second dust-generating layer 12 from flowing out through the ventilation hole 23 to the outside.

[0113] The heat insulating sheet 1A has a permeability of 4 cm 3 / (cm 2 This makes it possible for the heat insulating sheet 1A to further prevent the powder generated from the first dust-generating layer 11 or the second dust-generating layer 12 from flowing out through the ventilation holes 23 to the outside.

[0114] As described above, the insulating sheet 1A can prevent powder generated in the first dust-generating layer 11 or the second dust-generating layer 12 from leaking out of the insulating sheet 1A and can also prevent damage to the packaging material layer 20, so that it can be effectively used as an insulating sheet in clean environments where soot and dust are not desired.

[0115] A modified example of the heat insulating sheet 1A will be described. In this embodiment, for example, as shown in Fig. 4, the heat insulating sheet 1B may be configured such that the heat insulating material 10 is composed of only the first dust-generating layer 11, and only the first dust-generating layer 11 is covered with a packaging material layer 20.

[0116] In this embodiment, for example, as shown in FIGS. 5 and 6, the heat insulating sheet 1C may have the ventilation hole 23 of the packaging material layer 20 provided in the approximate center of the packaging material layer 20 on the upper surface of the second dust-generating layer 12.

[0117] In this embodiment, for example, as shown in FIG. 7, a heat insulating sheet 1D may have a vent hole 23 of a packaging material layer 20 provided on the lower surface of the first dust-generating layer 11. In the heat insulating sheet 1D shown in FIG.

[0118] In this embodiment, the ventilation hole 23 of the packaging material layer 20 is provided on the surface of the packaging film 21A that contacts the first dust-generating layer 11 and the second dust-generating layer 12, but for example, as shown in Fig. 8, the heat insulating sheet 1E may have the ventilation hole 23 in the sealed portion 22 of the packaging films 21A and 21B, with the sealed portion 22 being closer to the lower end surface of the side surface of the first dust-generating layer 11. As shown in Fig. 9, in a plan view of the heat insulating sheet 1E, the ventilation hole 23 may be provided in approximately the center of one side of the packaging material layer 20. Although one ventilation hole 23 is provided on one side of the packaging material layer 20, two or more ventilation holes 23 may be provided, and one or two or more ventilation holes may be provided on each of the four sides of the packaging material layer 20.

[0119] In this embodiment, the sealed portion 22 of the packaging material layer 20 is formed to protrude outward in the circumferential direction of the insulating material 10, but as shown in Fig. 10, the insulating sheet 1F may have a sealed portion 22 that does not protrude. One ventilation hole 23 may be provided on each of the four sides of the packaging material layer 20, or two or more ventilation holes 23 may be provided. Also, one or two or more ventilation holes 23 may be provided on each of two opposing sides of the four sides of the packaging material layer 20.

[0120] In addition, in this embodiment, as shown in Fig. 11, in the heat insulating sheet 1F, the packaging material layer 20 may be formed by folding back one packaging film 21A or 21B and welding or bonding the peripheral edges. Even in this case, the seal portion 22 of the packaging material layer 20 may be formed so as not to protrude outward in the circumferential direction of the heat insulating material 10. The ventilation hole 23 may be provided approximately in the center of one side of the packaging material layer 20. Although one ventilation hole 23 is provided on one side of the packaging material layer 20, two or more ventilation holes may be provided, and one or two or more ventilation holes may be provided on each of the four sides of the packaging material layer 20. EXAMPLES

[0121] The embodiments will be described in more detail below with reference to examples and comparative examples, but the embodiments are not limited to these examples and comparative examples.

[0122] <Creating the first dust layer> [Preparation of first dust layer 1] The following components were mixed to prepare a mixture for the first dust layer 1. Specifically, fumed silica particles and glass fibers were mixed, and the mixture was compression molded to a thickness of 2 mm to prepare the first dust layer 1. The prepared first dust layer 1 was cut to a predetermined size (40 mm x 40 mm). The density of the first dust layer 1 was 0.25 g / cm. 3 It was. (Ingredients) Fumed silica particles ("AEROSIL (registered trademark) R976S", manufactured by Nippon Aerosil Co., Ltd.): 83.3 parts by mass Glass fiber ("CS 25K-871", manufactured by Nitto Boseki Co., Ltd.): 16.7 parts by weight

[0123] <Creating the second dust layer> [Preparation of second dust-generating layer 1] Glass wool (uncured wool (1600g / m 2 The glass wool (manufactured by Central Glass Fiber Co., Ltd.) was heated for 5 minutes at 180° C. using a heat press machine to thermally cure the resin in the glass wool, and a compression-molded sheet having a thickness of 3 mm was obtained. The obtained sheet was used as the second dust-generating layer 1.

[0124] <Preparation of packaging film> [Preparation of packaging film 1] Packaging film 1 (sealant PET, thickness: 13 μm) was produced by laminating a polyethylene (PE) layer (thickness: 1 μm) as a sealant layer on a PET layer (12 μm). The produced packaging film 1 was cut to a specified size (42 mm x 42 mm).

[0125] [Preparation of packaging film 2] A packaging film 2 (thickness: 20 μm) was produced by laminating a PE layer (thickness: 1 μm) as a sealant layer on a PET layer (19 μm). The produced packaging film 2 was cut to a specified size (42 mm × 42 mm).

[0126] [Preparation of packaging film 3] A packaging film 3 (thickness: 26 μm) was produced by laminating a PE layer (thickness: 1 μm) as a sealant layer on a PET layer (25 μm). The produced packaging film 3 was cut to a specified size (42 mm × 42 mm).

[0127] [Preparation of packaging film 4] A packaging film 4 (thickness: 51 μm) was produced by laminating a PE layer (thickness: 1 μm) as a sealant layer on a PET layer (50 μm). The produced packaging film 4 was cut to a specified size (42 mm × 42 mm).

[0128] [Preparation of packaging film 5] A flame-retardant polycarbonate film (PHF 860MAB, thickness: 50 μm, manufactured by Sumitomo Bakelite Co., Ltd.) was used as the packaging film 5. The produced packaging film 5 was cut to a predetermined size (42 mm×42 mm).

[0129] [Preparation of packaging film 6] A breathable porous film (Sunmap (registered trademark) LC, thickness: 100 μm, manufactured by Nitto Denko Corporation) made of PE with an average molecular weight of 500,000 or more was used as the packaging film 6 with a thickness of 100 μm. The produced packaging film 6 was cut to a predetermined size (42 mm × 42 mm).

[0130] [Preparation of packaging film 7] A 50 μm thick flame-retardant polyethylene (PE) film (Nanen Densha, manufactured by Miki Kasei) was used as the packaging film 7. The packaging film 7 thus produced was cut to a predetermined size (42 mm × 42 mm).

[0131] [Preparation of packaging film 8] A biaxially oriented nylon film (NKBB-15, manufactured by Unitika Ltd.) having a thickness of 15 μm was used as the packaging film 9. The produced packaging film 8 was cut to a predetermined size (42 mm×42 mm).

[0132] [Preparation of packaging film 9] A packaging film 9 (sealant PET, thickness: 80 μm, manufactured by Rhein Plastics) was prepared by laminating a PE layer (thickness: 30 μm) as a sealant layer on a PET layer (50 μm). The prepared packaging film 9 was cut to a predetermined size (42 mm × 42 mm).

[0133] [Preparation of packaging film 10] A flame-retardant PE film (Iniga, manufactured by Sanyo Kasei Co., Ltd.) having a thickness of 20 μm was prepared as the packaging film 10. The prepared packaging film 10 was cut to a predetermined size (42 mm×42 mm).

[0134] <Production of laminated heat insulating film> [Comparative Example 1] The insulation material, which was a laminate consisting of the second dust-generating layer 1 laminated on the first dust-generating layer 1 thus prepared, was sandwiched between two packaging films 1, with the sealant layer of the packaging film 1 facing inward, and the outer periphery of 2 mm was heat-sealed with an impulse sealer, and the sealant layer was melted at 150° C. In this way, a laminated insulation film in which the insulation material was covered with a packaging material layer 1 consisting of two packaging films 1 was prepared as a test specimen.

[0135] (Check for powder leakage when compressed to 60%) Using a precision universal testing machine (Autograph AGS-5kNX, manufactured by Shimadzu Corporation), the test specimen was compressed by 60% in the thickness direction at a compression speed of 0.5 mm / min, after which the periphery of the test specimen was checked and it was visually confirmed whether or not the powder ejected from the first dust layer 1 or the second dust layer 1 had flowed out from the packaging material layer to the outside.

[0136] (Check whether the packaging layer bursts when compressed to 60%) Using a precision universal testing machine (Autograph AGS-5kNX, manufactured by Shimadzu Corporation), the test specimen was compressed by 60% in the thickness direction at a compression speed of 0.5 mm / min, and the expansion and rupture states of the film were visually confirmed and evaluated based on the following evaluation criteria. ((Evaluation Criteria)) A: Even with 60% compression, the packaging layer did not burst and the shape of the packaging layer remained neat. B: The packaging material layer does not burst when compressed by 60%. C: The packaging material layer burst at 60% compression.

[0137] [Example 1-1] A test specimen was prepared in the same manner as in Comparative Example 1, except that one ventilation hole having a diameter of 0.01 cm was provided in the center of the film located on the second dust-generating layer 1 side of the heat insulating material.

[0138] [Example 1-2] A test specimen was prepared in the same manner as in Example 1-1, except that the diameter of the vent hole was changed from 0.01 cm to 0.1 cm.

[0139] [Examples 1-3] In Example 1-2, the vent hole was changed from the packaging film 1 located on the second dust-generating layer 1 side of the heat insulating material to the center of the packaging film 1 located on the first dust-generating layer 1 side. Then, a 15 mm x 15 mm breathable porous film (Sunmap (registered trademark) LC, thickness: 0.4 mm, manufactured by Nitto Denko Corporation) was attached to four sides as the porous membrane 1 with double-sided tape, and the vent hole was covered with the porous membrane 1 to adjust the ventilation of the vent hole. Otherwise, the same procedure as in Example 1-2 was performed to prepare a test specimen.

[0140] [Examples 1-4 and 1-5] A test specimen was prepared in the same manner as in Example 1-3, except that the thickness of the porous membrane 1 was changed in Example 1-3. The thickness of the porous membrane 1 was changed to 0.3 mm in Example 1-4, and to 0.1 mm in Example 1-5.

[0141] [Examples 1-6] A test specimen was prepared in the same manner as in Example 1-3, except that the porous membrane 1 in Example 1-3 was changed to a porous membrane 2 (Nitothru (registered trademark) AP0401 with adhesive, manufactured by Nitto Denko Corporation).

[0142] [Examples 1-7] A test specimen was prepared in the same manner as in Example 1-3, except that the porous membrane 1 in Example 1-3 was changed to a porous membrane 3 (TEMISH (registered trademark) VPF310A2-S1 with adhesive, manufactured by Nitto Denko Corporation).

[0143] [Example 2-1] A test specimen was prepared in the same manner as in Comparative Example 1, except that the packaging material layer was changed from packaging film 1 to packaging film 2.

[0144] [Example 2-2] A test specimen was prepared in the same manner as in Example 1-5, except that the packaging material layer was changed from packaging film 1 to packaging film 2 in Example 1-5.

[0145] [Example 2-3] A specimen was prepared in the same manner as in Example 2-2, except that the porous membrane 1 in Example 2-2 was changed to a porous membrane 2 (Nitothru (registered trademark) AP0401 with adhesive, manufactured by Nitto Denko Corporation).

[0146] [Example 2-4] A test specimen was prepared in the same manner as in Example 2-2, except that the porous membrane 1 in Example 2-2 was changed to a porous membrane 3 (TEMISH (registered trademark) VPF310A2-S1 with adhesive, manufactured by Nitto Denko Corporation).

[0147] [Example 3-1] A test specimen was prepared in the same manner as in Comparative Example 1, except that the packaging material layer was changed from packaging film 1 to packaging film 3.

[0148] [Example 3-2] A test specimen was prepared in the same manner as in Example 1-5, except that the packaging material layer was changed from packaging film 1 to packaging film 3.

[0149] [Example 3-3] A test specimen was prepared in the same manner as in Example 3-2, except that the porous membrane 1 in Example 3-2 was changed to a porous membrane 2 (Nitothru (registered trademark) AP0401 with adhesive, manufactured by Nitto Denko Corporation).

[0150] [Example 3-4] A test specimen was prepared in the same manner as in Example 3-2, except that the porous membrane 1 in Example 3-2 was changed to a porous membrane 3 (TEMISH (registered trademark) VPF310A2-S1 with adhesive, manufactured by Nitto Denko Corporation).

[0151] [Example 4-1] A test specimen was prepared in the same manner as in Comparative Example 1, except that the packaging material layer was changed from packaging film 1 to packaging film 4.

[0152] [Example 4-2] A test specimen was prepared in the same manner as in Example 1-5, except that the packaging material layer was changed from packaging film 1 to packaging film 4.

[0153] [Example 4-3] A test specimen was prepared in the same manner as in Example 4-2, except that the porous membrane 1 in Example 4-2 was changed to a porous membrane 2 (Nitothru (registered trademark) AP0401 with adhesive, manufactured by Nitto Denko Corporation).

[0154] [Example 4-4] A test specimen was prepared in the same manner as in Example 4-2, except that the porous membrane 1 in Example 4-2 was changed to a porous membrane 3 (TEMISH (registered trademark) VPF310A2-S1 with adhesive, manufactured by Nitto Denko Corporation).

[0155] [Example 5] A test specimen was prepared in the same manner as in Comparative Example 1, except that the packaging material layer was changed from packaging film 1 to packaging film 5.

[0156] [Example 6] A test specimen was prepared in the same manner as in Example 1-5, except that the packaging material layer was changed from packaging film 1 to packaging film 5.

[0157] [Example 7] A test specimen was prepared in the same manner as in Comparative Example 1, except that the packaging material layer was changed from packaging film 1 to packaging film 6.

[0158] [Example 8] A test specimen was prepared in the same manner as in Comparative Example 1, except that the packaging material layer was changed from packaging film 1 to packaging film 7.

[0159] [Example 9] A test specimen was prepared in the same manner as in Example 1-5, except that the packaging material layer was changed from packaging film 1 to packaging film 7.

[0160] [Comparative Example 2] A test specimen was prepared in the same manner as in Comparative Example 1, except that the packaging material layer was changed from packaging film 1 to packaging film 8.

[0161] [Example 10] A test specimen was prepared in the same manner as in Example 1-5, except that the packaging material layer was changed from packaging film 1 to packaging film 8.

[0162] [Example 11] A test specimen was prepared in the same manner as in Comparative Example 1, except that the packaging material layer was changed from packaging film 1 to packaging film 9.

[0163] [Example 12] A test specimen was prepared in the same manner as in Example 1-5, except that the packaging material layer was changed from packaging film 1 to packaging film 9.

[0164] [Example 13] A test specimen was prepared in the same manner as in Comparative Example 1, except that the packaging material layer was changed from packaging film 1 to packaging film 10.

[0165] [Example 14] A test specimen was prepared in the same manner as in Example 1-5, except that the packaging material layer was changed from packaging film 1 to packaging film 10 in Example 1-5.

[0166] [Comparative Example 3] In Comparative Example 1, the heat insulating material was made to have only the first dust-generating layer 1, and the heat insulating material was sandwiched between two packaging films 1 with the sealant layer of the packaging film 1 on the inside, and the outer periphery of 2 mm was heat sealed with an impulse sealer, and the sealant layer was melted at 150° C. In this way, a laminated heat insulating film in which the heat insulating material was covered with the packaging material layer 1 consisting of two packaging films 1 was produced as a test specimen.

[0167] [Comparative Example 4] A test specimen was prepared in the same manner as in Comparative Example 3, except that one ventilation hole having a diameter of 0.1 cm was provided in the center of the packaging film 1 located above the heat insulating material.

[0168] [Example 15] A test specimen was prepared in the same manner as in Comparative Example 3, except that the packaging material layer was changed from packaging film 1 to packaging film 2.

[0169] [Example 16] A test specimen was prepared in the same manner as in Comparative Example 3, except that the packaging material layer was changed from packaging film 1 to packaging film 3.

[0170] [Example 17] A test specimen was prepared in the same manner as in Comparative Example 3, except that the packaging material layer was changed from packaging film 1 to packaging film 4.

[0171] [Example 18] A test specimen was prepared in the same manner as in Comparative Example 3, except that the packaging material layer was changed from packaging film 1 to packaging film 5.

[0172] [Example 19] A test specimen was prepared in the same manner as in Comparative Example 3, except that the packaging material layer was changed from packaging film 1 to packaging film 6.

[0173] [Example 20] A test specimen was prepared in the same manner as in Comparative Example 3, except that the packaging material layer was changed from packaging film 1 to packaging film 7.

[0174] [Example 21] A test specimen was prepared in the same manner as in Comparative Example 3, except that the packaging material layer was changed from packaging film 1 to packaging film 9.

[0175] [Example 22] A test specimen was prepared in the same manner as in Comparative Example 3, except that the packaging material layer was changed from packaging film 1 to packaging film 10.

[0176] [Example 23-1] In Comparative Example 4, a 15 mm x 15 mm breathable porous film (Sunmap (registered trademark) LC, thickness: 0.4 mm, manufactured by Nitto Denko Corporation) was attached to four sides as the porous membrane 1 with double-sided tape, and the ventilation hole was covered with the porous membrane 1 to adjust the ventilation of the ventilation hole. Otherwise, the same procedure as in Comparative Example 4 was performed to prepare a test specimen.

[0177] [Examples 23-2 and 23-3] A test specimen was prepared in the same manner as in Example 23, except that the thickness of the porous membrane 1 was changed in Example 23-1. The thickness of the porous membrane 1 was changed to 0.3 mm in Example 23-2, and to 0.1 mm in Example 23-3.

[0178] [Example 23-4] A test specimen was prepared in the same manner as in Example 23-1, except that the porous membrane 1 in Example 23-1 was changed to a porous membrane 2 (Nitothru (registered trademark) AP0401 with adhesive, manufactured by Nitto Denko Corporation).

[0179] [Example 23-5] A specimen was prepared in the same manner as in Example 23-1, except that the porous membrane 1 in Example 23-1 was changed to a porous membrane 3 (TEMISH (registered trademark) VPF310A2-S1 with adhesive, manufactured by Nitto Denko Corporation).

[0180] <Evaluation of the physical properties of packaging films, insulation materials, and laminated insulation films> The following physical properties of the packaging film, the heat insulating material, and the laminated heat insulating film were measured as follows. The measurement results are shown in Table 1.

[0181] (Thickness of packaging film) The thickness of each of the above packaging films was measured using a digital thickness gauge.

[0182] (Insulation area) Using a measuring tool, the lengths of two sides of the heat insulating material, which is a laminate of the first dust-generating layer 1 and the second dust-generating layer 1, were measured to determine the area of ​​the main surface of the heat insulating material.

[0183] (Insulation thickness) The thickness of the insulation was measured using a digital thickness gauge.

[0184] (Breaking strength of packaging film) The breaking strength of the packaging film was measured at 25°C and 50% RH using a method conforming to JIS K 7127. The compression speed was 5 mm / min.

[0185] (Tensile elongation of packaging film) The tensile elongation (%) of the packaging film was measured in an environment of 25°C and 50% RH using a method conforming to JIS K 7127. The compression speed was 5 mm / min. As shown in the following formula (II), the tensile elongation is the elongation between the gauge points of the packaging film at break (LL 0) to the gage length L of the packaging film 0 This is the value expressed as a percentage. Tensile elongation (%) = (LL 0 ) / L 0 ×100 (II)

[0186] (Breaking elongation of packaging film) The elongation at break is calculated by adding +100% to the tensile elongation according to the following formula (I). Breaking elongation (%) = L / L 0 ×100 (I)

[0187] (Young's Modulus) The Young's modulus (tensile modulus) was measured in an environment of 25°C and 50% RH according to the method in accordance with JIS-K-7161. The test speed was 5 mm / min.

[0188] (Nitrogen permeability) Nitrogen permeability was measured using a differential pressure gas chromatography method in accordance with JIS K 7126-1 "Plastics - Films and sheets - Gas permeability test method - Part 1: Differential pressure method."

[0189] (Ventilation rate of vents) Using a Frazier-type tester, the air permeability was measured in an environment of 25°C and 50% RH according to a method conforming to JIS L 1096. A test piece of a specified size (200 mm x 200 mm) was prepared, and air was sucked in to a pressure of 125 kPa, and the air flow rate at that time was measured.

[0190] (Strength Rate) The strength rate of the compressed laminated film was calculated based on the following formula (3).

[0191]

number

[0192] (Ventilation rate) The air permeability rate of the compressed laminated film was calculated based on the following formula (4).

[0193]

number

[0194] The sum of the strength rate value and the air permeability rate value obtained above was calculated, and it was determined whether the following formula (1) was satisfied.

[0195]

number

[0196] The configurations of the heat insulating material, packaging material layer, and porous membrane of each of the above-mentioned Examples and Comparative Examples, and the state after the main surface of the compressed laminated film was compressed by 60% (whether or not powder flowed out and whether or not it burst) are shown in Table 1. The size of the heat insulating material, the characteristics of the packaging material layer, the configuration of the ventilation hole, and the tensile strength of the packaging material layer of each of the above-mentioned Examples and Comparative Examples are shown in Table 2. The value obtained by multiplying the breaking strength of the packaging material layer by the square of the tensile elongation (breaking strength x tensile elongation) of the above-mentioned Examples and Comparative Examples is shown in Table 3. 2 ) and the strength rate, air permeability rate, and the calculated values ​​of the above formula (1) for the compressed laminated film are shown in Table 3.

[0197] [Table 1]

[0198] [Table 2]

[0199] [Table 3]

[0200] From Tables 1 to 3, it was confirmed that in each Example, even when the compressed laminated film was compressed by 60% in the thickness direction, the powder did not flow out and the packaging material layer did not break. In particular, in Examples 1-2, 1-5 to 1-7, Examples 2-2 to 2-4, Examples 3-2 to 3-4, Examples 4-2 to 4-4, Examples 6, 7, 9, 10, 12, 14 to 22, and 23-1 to 23-5, it was confirmed that the shape of the packaging material layer was hardly changed and the shape was maintained. On the other hand, in Comparative Examples 1 to 3, it was confirmed that the packaging material layer broke when the compressed laminated film was compressed by 60% in the thickness direction, and in Comparative Example 4, it was confirmed that the powder flowed out when the compressed laminated film was compressed by 60% in the thickness direction.

[0201] Therefore, it was confirmed that, unlike the compressed laminated films of Comparative Examples 1 to 4, in the compressed laminated films of each Example, even if the compressed laminated film is compressed from the outside by at least 60% in the thickness direction, no outflow of powder occurs and the packaging material layer does not break, as long as the value obtained from the above formula (1) is 2.0 or more. Furthermore, it was confirmed that, since the packaging material layer has high breathability, the shape of the packaging material layer hardly changes and can be maintained.

[0202] As described above, the embodiment has been described, but the above embodiment is presented as an example, and the present invention is not limited to the above embodiment. The above embodiment can be implemented in various other forms, and various combinations, omissions, substitutions, modifications, etc. can be made without departing from the gist of the invention. These embodiments and their modifications are included in the scope and gist of the invention, and are included in the scope of the invention and its equivalents described in the claims. [Explanation of symbols]

[0203] 1A, 1B, 1C, 1D, 1E, 1F, 1G Insulation sheet 10. Insulation 11 First dust layer 12 Second dust layer 20 Packaging material layer 21A, 21B Packaging film 23 Vent 30 Porous Membrane

Claims

1. one or more first dust-generating layers that generate dust when an external force is applied; a packaging material layer formed of a packaging film and covering the one or more first dust-generating layers; Equipped with A heat insulating sheet that satisfies the following formula (1). [0010] (In the formula, A is the Young's modulus (MPa) of the packaging film, B is the breaking strength (MPa) of the packaging film, C is the breaking elongation (%) of the packaging film, D is the tensile strength (MPa) applied to the packaging film during compression, and F is the area (m ２ ) and G is the nitrogen permeability (cm 3 / (m 2 .day.MPa), and H is the air permeability (cm 3 / (cm 2 s) and I is the area of ​​the vent (cm 2 ) and J is the thickness of the insulation material (mm).

2. The heat insulating sheet according to claim 1 , which satisfies the following formula (2): [0025] (Wherein, F is the area (m2) of the heat insulating material including the first dust-generating layer. ２ ) and G is the nitrogen permeability (cm 3 / (m 2 .day.MPa), and H is the air permeability (cm 3 / (cm 2 s) and I is the area of ​​the vent (cm 2 ) and J is the thickness of the insulation material (mm).

3. The heat insulating sheet according to claim 1 or 2, wherein the first dust-generating layer contains silica particles.

4. The heat insulating sheet according to claim 3 , wherein the first dust-generating layer further contains inorganic fibers.

5. The heat insulating sheet according to any one of claims 1 to 4, wherein the packaging material layer is not adhered to the first dust-generating layer.

6. the dust-generating layer includes one or more second dust-generating layers which generate less dust than the first dust-generating layer when an external force is applied thereto; The heat insulating sheet according to any one of claims 1 to 5, wherein the packaging material layer further covers one or more of the second dust-generating layers.

7. The heat insulating sheet according to claim 6 , wherein the second dust-generating layer comprises a porous body having voids therein.

8. The heat insulating sheet according to claim 7 , wherein the second dust-generating layer comprises inorganic fibers and a binder.

9. The heat insulating sheet according to claim 7 , wherein the second dust-generating layer comprises a foamed resin.

10. The heat insulating sheet according to any one of claims 6 to 9, wherein the packaging material layer is not adhered to the second dust-generating layer.

11. The heat insulating sheet according to any one of claims 1 to 10, wherein the packaging material layer has one or more ventilation holes.

12. The heat insulating sheet according to any one of claims 6 to 10, wherein the packaging material layer has one or more ventilation holes on a surface in contact with the second dust-generating layer.

13. The area of ​​the vent is 0.000079 cm ２ The heat insulating sheet according to claim 11 or 12.

14. The heat insulating sheet according to any one of claims 11 to 13, wherein the vent hole is covered with a porous membrane sheet.

15. The air permeability of the porous membrane sheet is 4 cm ３ / (cm 2 The heat insulating sheet according to claim 14, wherein the thickness is equal to or greater than s.

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