JP2012107692A - Heat insulating material, and heat retaining bag - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat insulating material and a heat retaining bag, which has superior heat insulating property, has a light weight and flexibility and has long-time durability.SOLUTION: The heat insulating material, configured so as to package a fiber-accumulated body and a gas with a covering material, is characterized in that the gas is a gas having a heat conductivity of 0.0266 W/(m×K) or less, the covering material has a carbon dioxide gas permeability of 15 ml/(m×day×atm) or less and the covering material is constituted of a thin membrane such as a film and a cloth laminated on the surface of the thin membrane. The heat retaining bag using the heat insulating material is also provided.

Description

The present invention relates to a heat insulating material and a heat insulating bag.

  In general, the heat insulation bag is used when transporting food, and is used to keep the temperature of hot or cold food constant. For example, foods such as pizza that provide home delivery services use a thermal insulation bag to deliver to a destination in a warm state immediately after cooking in an oven. Therefore, the thermal insulation performance, that is, the heat insulation performance is very important for the thermal insulation bag. In recent years, a heated iron plate or ceramic plate is placed inside the heat insulation bag to keep the heat. However, there was no change in the thermal insulation performance of the bag, and there was a problem that the pizza cooled down during long delivery.

  Therefore, a bag using a laminated sheet of a film having an aluminum vapor deposition layer and a plastic foam sheet is disclosed in order to improve the heat insulating performance of the bag. (Patent Document 1) However, the heat insulation performance is only slightly improved, and there is no performance that contributes to a decrease in food temperature.

  Moreover, in order to improve heat insulation performance, the heat insulating material which packages a microporous heat insulating material and the gas of low thermal conductivity with a film is disclosed. (Patent Document 2) However, the film has low strength and wear resistance for use in a back and low durability for long-term use.

  Furthermore, in order to improve heat insulation performance, the vacuum heat insulating material packed with the core material and film of the fiber nonwoven fabric is disclosed. (Patent Document 3) However, since the heat insulating material that makes the high-density nonwoven fabric in a vacuum state becomes hard and cannot be bent, there is a problem that the back molding is difficult and the usability is poor.

JP 2002-173181 A (Claim 1, 0012) JP-A-03-55719 (Claims 1 and 2) JP 2008-286282 A (Claim 1, 0016)

  The present invention provides a heat insulating material having excellent tensile strength, tear strength, and abrasion resistance, low thermal conductivity, excellent heat retention, flexibility and high moldability, and a heat insulation bag using the same. Is an issue.

To solve the problem. The present invention has the following configuration.
(1) A heat insulating material in which a fiber aggregate and gas are packed with a skin material, wherein the gas has a thermal conductivity of 0.0266 W / m · K or less, and the carbon dioxide gas permeability of the skin material is 15 ml / m ² · day · atm or less, and the outer skin material has a thin film and a fabric laminated on at least one surface of the thin film,
(2) The heat insulating material, wherein the thin film constituting the outer skin material is a film,
3, the film is a laminated film of a plurality of layers, and has one or more layers selected from one or more resins of ethylene vinyl alcohol copolymer, polyvinyl alcohol, polyglycolic acid, polyethylene terephthalate, Insulation material,
(4) The fiber assemblage according to any one of the above, wherein the fiber aggregate includes fibers having a fiber diameter of 15 μm or less with respect to the total mass of 70% by mass or more and a density of 150 kg / m ³ or less. Insulation,
(5) The heat insulating material according to any one of claims 1 to 4, wherein the heat insulating material has a bending strength of 20 N / cm ² or less.
(6) The heat insulating material according to any one of the above, wherein the fabric is a woven fabric having a weight per unit area of 50 to 400 g / m ² and uses polyester fiber or nylon fiber.
(7) A heat insulating bag in which any of the heat insulating materials described above overlaps and has a hollow portion between the heat insulating materials.

  ADVANTAGE OF THE INVENTION According to this invention, the heat insulating material which is excellent in tensile strength, tear strength, and abrasion resistance, is low in thermal conductivity, is excellent in heat retention, and is flexible, and a heat insulation bag using the same are provided. Moreover, the heat insulating material and heat insulating bag of this invention are excellent in workability and productivity.

It is a schematic diagram which shows the structure of the cross section of an example of the heat insulating material of this invention. It is a schematic diagram of an example of the heat insulation bag of this invention.

Hereinafter, embodiments of the present invention will be described in detail.

The heat insulating material of the present invention has a configuration in which a fiber assembly and gas are wrapped with a skin material 2. By doing so, excellent heat insulation performance can be exhibited by the effect of suppressing convection heat transfer of the fiber aggregate and the effect of suppressing heat transfer of gas. In particular, the thermal conductivity representing an index of thermal insulation is preferably less than 0.038 W / m · K of glass wool (density 24 kg / m ³ ) that is generally widely used, and more preferably 0.032 W / Less than m · K, more preferably less than 0.028 W / m · K. Below, the structure of a fiber integrated body, gas, a skin material, a heat insulating material, and a heat insulation bag is demonstrated in detail.
[Fiber assembly]
The fiber assembly in the present invention preferably has a large space in order to suppress heat conduction inside the heat insulating material.

  The fibers constituting the fiber assembly in the present invention can be freely selected from synthetic fibers, inorganic fibers, natural fibers, and the like. For example, synthetic fibers include polyester (polyethylene terephthalate, polybutylene terephthalate, polytrimethylene terephthalate, polylactic acid, etc.) fiber, polyamide (nylon 6, nylon 11, nylon 12, nylon 66, nylon 610, nylon 510, etc.) fiber, polyolefin (Polyethylene, polypropylene) fiber, polyacetal fiber, acrylic fiber, aramid fiber, fluorine fiber, carbon fiber and the like. There are also recycled fibers such as rayon. Examples of inorganic fibers include glass fibers, artificial mineral fibers, and metal fibers. Natural fibers include wood pulp, bagasse, wheat straw, reed, papyrus, bamboo, pulp, cotton, kenaf, roselle, Asa, flax, ramie, jute, hemp, sisal asana, Manila Asa, palm, banana, wool and the like. These may be used alone, but two or more kinds of fibers selected from these may be mixed. Polyester (polyethylene terephthalate, polybutylene terephthalate, polylactic acid, etc.) fiber (official moisture content 0.5%), which has high versatility and has an official moisture content of 1% or less and less concern about deterioration of heat insulation performance due to moisture, Or, polyolefin (polyethylene, polypropylene) fiber (official moisture content 0%) is preferably used.

  As the cross-sectional shape of the synthetic fiber, a multi-lobe cross section such as a round cross section, a hollow cross section, a porous hollow cross section, a trilobal cross section (triangular cross section, Y cross section, T cross section, etc.), flat cross section, W cross section, X cross section, etc. Is possible. It is also possible to use a mixture of various cross-sectional shapes.

  The fibers constituting the fiber assembly in the present invention preferably have crimps. By doing so, bulkiness improves in a heat insulating material, and it is excellent in heat insulation and long-term form retainability. In addition, the carding method at the time of the fiber assembly forming process is firmly caught by the needle, and the fibers are uniformly dispersed and intertwined closely to form a porous body having a space, thereby obtaining a stable and high yield fiber assembly. Can do.

  The fibers constituting the fiber assembly in the present invention preferably have a fiber length of 5 to 100 mm. By doing so, in the carding method at the time of the fiber integrated body forming step, it is possible to obtain a heat insulating material that is uniformly dispersed and densely entangled and has fine voids, and has excellent heat insulating properties.

  Moreover, it is preferable that the fiber which comprises the fiber assembly in this invention contains 70 mass% or more of fibers with an average fiber diameter of 15.0 micrometers or less with respect to the whole quantity of a fiber assembly. More preferably, the average fiber diameter is 12.0 μm or less, and still more preferably 10.0 μm or less. By doing so, it can be intertwined closely and have fine voids, can suppress the convection of the filling gas, and a heat insulating material excellent in heat insulating properties can be obtained.

  Furthermore, it is preferable that the fiber which comprises the fiber assembly in this invention contains the fiber (binder fiber) which has a component of lower melting | fusing point than another fiber. By doing so, by applying heat at the time of forming the fiber assembly, the binder fiber is firmly bonded in part between the fibers in the fiber assembly, and thereby heat insulation with excellent long-term shape retention You can get the material. Examples of binder fibers include core-sheath composite fibers, side-by-side fibers, and blended fibers. Among them, it is preferable to use a core-sheath composite fiber in which the sheath is a low melting point component and the core is a component having a higher melting point than the sheath. By doing so, the shape of the sheath collapses due to heat at the time of molding, and the thin core portion remains as a fiber, so that a more dense structure can be formed in other fibers, and fine voids can be created. The heat insulating material excellent in long-term form retainability can be obtained. Further, by using binder fibers having an average fiber diameter of 20 μm or less, a heat insulating material having excellent heat insulation can be obtained because the fiber aggregate has a dense structure and fine voids are formed. More preferably, it is 15.0 micrometers or less, More preferably, it is 10.0 micrometers or less. Examples of combinations of components constituting the binder fiber include low-melting point polyester and homopolyester, polyolefin and polyester, polyethylene and polypropylene, and the like. The binder fiber is preferably 5% by mass or more and less than 90% by mass with respect to the entire fiber laminate from the viewpoints of form retention and heat insulation. The binder fiber preferably has crimps, like the other fibers.

The fiber aggregate in the present invention preferably has a density of 150 kg / m ³ or less. More preferably, it is 100 kg / m < ³ > or less, More preferably, it is 50 kg / m < ³ > or less. The higher the density of the fiber aggregate, the more porous it becomes and the convective heat transfer can be suppressed. However, if it exceeds 150 kg / m ³ , the performance improvement effect by increasing the density will not become extremely small, and the heat insulation performance Is not economical because it will hardly improve.

  The fiber assembly in the present invention is not particularly limited as long as the fibers are accumulated, and may be a long fiber nonwoven fabric or a short fiber nonwoven fabric. In particular, a short fiber nonwoven fabric is preferable because the thickness and density can be freely designed.

In the method for producing a fiber assembly according to the present invention, it is preferable to mix the fibers, open the fibers, laminate the web by the carding method or the airlaid method, and perform heat treatment. By this carding method or airlaid method, an aggregate in which fibers are uniformly dispersed can be produced. In addition, it is also effective from the viewpoint of long-term shape retention to incorporate a method of entanglement of fibers by a needle punch method before heat treatment. The heat treatment temperature is higher than the temperature at which the low melting point component in the binder fiber is softened or melted, and lower than the temperature at which the other components (other fiber and the high melting point component in the binder fiber) melt. As a result, the low melting point component is softened or melted, the fibers can be firmly joined together, and the heat insulating material is excellent in long-term shape retention. As a heat treatment method, an infrared heater, a hot roll, a hot air dryer, a hot air circulation heat treatment machine, or the like is used.
[gas]
The gas (gas) inside the heat insulating material in the present invention has a thermal conductivity of air of 0.0266 W / m · K (at 298 K, 101 kPa, the thermal conductivity of the gas described below is also set to the same temperature and pressure conditions) or less. It is. This is because by filling the heat insulation material with a gas with a lower thermal conductivity than air (low heat conductivity gas), the heat conduction of the heat insulation material is suppressed and the heat insulation performance of the heat insulation material is improved. It is to do. Examples of the low thermal conductivity gas include hydrocarbons such as isobutane (0.0163 W / m · K), carbon dioxide (CO ₂ , 0.0168 W / m · K), and argon (Al, 0.0180 W / m · K). ), Krypton (Kr, 0.0094 W / m · K), and xenon (Xe, 0.0056 W / m · K). Among them, a heat insulating material using carbon dioxide gas or argon gas is industrially inexpensive and is optimal for applications requiring low prices. In addition, a heat insulating material using krypton gas or xenon gas has a lower thermal conductivity, and is optimal for applications that require high performance. Note that halogen compounds such as chlorofluorocarbon have lower thermal conductivity than air, but are sometimes considered as one of the substances that cause global warming.

  The lower the thermal conductivity gas concentration inside the heat insulating material in the present invention, the higher the thermal conductivity, the lower the thermal conductivity, preferably 70% or more, more preferably 80% or more, and still more preferably 90% or more. Further, if the low thermal conductivity gas concentration inside the heat insulating material is less than 30%, the heat conductivity of the air remaining inside the heat insulating material greatly contributes and sufficient heat insulating performance cannot be obtained.

The filling amount of the low thermal conductivity gas inside the heat insulating material is preferably such that the internal pressure is substantially the same as the atmospheric pressure. Since the atmospheric pressure differs somewhat depending on the location and temperature, the atmospheric pressure is determined in consideration of the location and temperature range to be used. When the internal pressure greatly exceeds atmospheric pressure, the heat insulating material swells and deformation such as bending becomes difficult.
[Skin material]
The outer skin material of the present invention has a thin film and a structure in which a fabric is laminated on at least one surface of the thin film.

The skin material in the present invention has a carbon dioxide gas permeability of 15 ml / m ² · day · atm (23 ° C., 0% RH) or less measured based on the gas chromatograph method described in JIS K7126-2 (2006). This is because it is more preferable that the fiber aggregate is wrapped in a shell material and filled with a low-conductivity gas at a high concentration inside, and in this case, it is better that there is less gas leakage or air mixing. is there. When the carbon dioxide gas permeability of the outer skin material is high, the gas filled in the inside is replaced with air at an early stage, and the heat insulation performance is lowered, so that the service life of the heat insulation material is shortened. In addition, when the use period of the heat insulating material is required for 10 years or more, the carbon dioxide permeability is preferably 5 ml / m ² · day · atm or less, and when used for a longer period, the carbon dioxide permeability is 0.1 ml / It is preferable that it is below m < ² > * day * atm. Carbon dioxide gas has a very high affinity with resins and is more permeable than other gases, so even if the gas filled inside the heat insulating material is other than carbon dioxide, the performance of the skin material is the above performance If it is above, it can be used satisfactorily.

The skin material in the present invention has a water vapor transmission rate of 5.0 g / m ² · day · atm (40 ° C., 90% RH) or less measured based on the infrared sensor method described in JIS K7129 (2008). It is preferably 1.0 g / m ² · day · atm or less, more preferably 0.1 g / m ² · day · atm or less. This is because water has a very high thermal conductivity, and if water vapor enters the inside of the heat insulating material, the heat insulating performance is extremely lowered.

  As a thin film that can be used as the skin material, a film, particularly a plastic film, is preferable, and a multi-layer laminated film is preferable. When composed of a plurality of layers, at least one layer is preferably a resin (= gas barrier resin) layer having a low gas permeability. Examples of the gas barrier resin include ethylene vinyl alcohol copolymer (EVOH), polyvinyl alcohol (PVA), polyamide, polyglycolic acid (PGA), polyethylene terephthalate (PET), polyphenylene sulfide (PPS), and fluorine resin. Of these, polyglycolic acid, polyethylene terephthalate, and the like are preferable because of their low hygroscopicity and extremely low humidity dependency of gas permeability. Further, ethylene vinyl alcohol copolymer (EVOH) and polyvinyl alcohol (PVA) are preferable because they have a strong interaction between polymer main chains and a resin having a small free volume. Further, two or more layers of one kind of resin film selected from the above resins can be laminated in order to lower the gas permeability. It is also possible to select two or more types of resins and to laminate a plurality of layers. Moreover, it is preferable that thickness is 1-100 micrometers.

  When using a multilayer film of multiple layers, it is preferable that at least 1 layer is a metal foil, a metal vapor deposition film, a metal foil laminated film, and a heat ray reflective layer laminated film. Since these have low gas permeability, heat insulating materials can be used for a long time by laminating them on the skin material.

  Examples of the metal foil include gold foil, silver foil, copper foil, tin foil, and aluminum foil (AL foil). Among these, aluminum foil is more preferable because it is inexpensive and has excellent workability.

  As a metal vapor deposition film, a metal or a metal compound is vapor-deposited on the film surface, and the metal film is formed. Examples of the metal used for the vapor deposition layer include aluminum (AL), indium, zinc, gold, silver, platinum, nickel, and chromium. Examples of the metal oxide used for the vapor deposition layer include oxides such as titanium, zirconium, silicon, magnesium, and palladium. As a vapor deposition method of metal or metal oxide, a vacuum vapor deposition method, an EB vapor deposition method, a sputtering method, a physical vapor deposition method such as an ion plating method, a chemical vapor deposition method such as plasma CVD, etc. can be used. From this point of view, the vacuum deposition method is particularly preferably used. When laminating a vapor deposition layer, it is preferable to perform a pretreatment such as a corona discharge treatment on the vapor deposition surface of a resin film serving as a substrate in advance in order to improve the adhesion of the vapor deposition film. Moreover, when forming a vapor deposition layer, it is also preferable to apply | coat a primer agent in-line or offline beforehand on the film used as a base material. Providing a coating layer of the primer agent is effective for obtaining a vapor-deposited film with high adhesion and reducing gas permeability. Moreover, it is more preferable to heat-treat at 150 ° C. or higher after forming a deposited layer of the outer skin material. By heat-treating, the affinity between the vapor deposition layer and the film can be increased, and cracking or peeling of the vapor deposition layer can be prevented when the heat insulating material is manufactured or used.

  As a metal foil laminated film, a metal foil is bonded to a film with an adhesive.

The heat ray reflective layer laminated film is a film in which a film having a heat ray reflecting function or a film to which a heat ray reflecting material is added is laminated.
As the multi-layered film, at least one layer is composed of at least one or two or more selected from the group consisting of polyamide, aromatic polyester, aliphatic polyester, and polyolefin (for example, biaxially oriented polypropylene (OPP)). It is preferable to laminate the blended resin films. The resin is excellent in strength, weather resistance, and chemical resistance, and can reinforce and protect the gas barrier resin film. The thickness is preferably 1 to 100 μm.

  The multi-layered film preferably further has a heat seal layer on at least one surface. Use heat seal to manufacture the heat insulation material so that the fiber aggregate is completely wrapped by including the heat seal layer, or to bond the outer periphery of the skin material after wrapping the core material with a sheet Manufacturing can be made more efficient. Moreover, the sealing property of a heat insulating material can be improved. A method for forming the heat seal layer includes a method of laminating films by a dry lamination method and a method of laminating a heat sealable resin by an extrusion lamination method, and the extrusion lamination method is preferable because of low cost. As the heat sealable resin constituting the heat seal layer, a thermoplastic resin can be preferably used. For example, a low density polyethylene resin (LDPE), a linear low density polyethylene resin (LLDPE), an ethylene / propylene copolymer, an ethylene / propylene copolymer, A methacrylic acid copolymer (EMAA), an ethylene / vinyl acetate copolymer, an ethylene / α-olefin copolymer, an unstretched polypropylene (CPP), or the like can be selected and used depending on use conditions such as temperature. The thickness is preferably 1 to 100 μm.

  The order of lamination in the multi-layer laminated film is not particularly limited. For example, there are [heat seal layer / gas barrier resin layer], [surface protective layer / gas barrier resin layer / heat seal layer], and specifically [LDPE / AL vapor deposited PET], [LDPE / PVA], [CPP / AL vapor deposited PGA], [OPP / AL vapor deposited PET / LDPE], [OPP / AL foil laminated PET / CPP], [OPP / AL vapor deposited PGA / CPP] , [OPP / AL vapor deposition EVOH / CPP], [OPP / AL vapor deposition PVA / CPP] and the like are preferable because they are excellent in gas barrier properties, heat seal properties, and surface protection, and are low in cost.

  In the skin material of the present invention, a fabric is laminated on at least one surface of the thin film. Since the fabric is laminated on the surface, the tensile strength and tear strength are higher than when a thin film such as a film is used alone. In addition, it has excellent surface wear resistance, prevents wrinkles, and prevents holes from being formed, reducing damage to the outer skin material, protecting the gas barrier film inside the outer skin material, and providing excellent heat insulation. Thermal insulation is provided. Furthermore, the dictated heat retaining bag can be used for a long time. Furthermore, when manufacturing a bag-shaped heat insulation bag like the form of an envelope, it can be simply manufactured by sewing a fabric. By sewing, the tensile strength of the joined portion is increased, and the heat insulation bag can be used for a long time. In addition to sewing, the fibers can be joined by heat sealing. In this case, the bag can be used as a safe and secure food transport bag without performing the remaining needle inspection process for checking the broken needle. In addition, since the needle is not used when the heat insulation bag is manufactured, the needle does not have a hole in the gas-filled portion of the heat insulating material.

  The fabric in the present invention may be any fabric as long as it can be laminated and can protect the thin film. For example, woven fabric (plain weave, oblique weave, satin weave), knitted fabric (tricot, round net), short fiber, etc. Nonwoven fabric, long fiber nonwoven fabric, etc. are mentioned. One kind or two or more kinds of these can be laminated. Among these, it is preferable to use a woven fabric having high tensile strength and tear strength and good wear resistance. Further, among the woven fabrics, the plain weave is more preferable because the tensile strength of the warp and the width of the portion joined by sewing is uniform and stable strength can be obtained.

It is preferable that the fabric in this invention is 50-400 g / m < ² > of fabric weights, More preferably, it is 70-350 g / m < ² >, More preferably, it is 100-250 g / m < ² >. When the fabric weight is more than 400 g / m ² , the fabric itself becomes hard, and the processing becomes difficult when the heat insulation bag is created. When the weight per unit area is less than 50 g / m ² , the tensile strength, tear strength, and wear resistance are lowered, and sufficient physical properties for protecting the outer skin material cannot be maintained.

  The mechanical properties of the outer skin material are preferably a tensile strength of 300 N or higher, a tear strength of 10 N or higher, and a wear resistance of 3 or higher, more preferably tensile strength, in order to prevent tearing and perforation when using a thermal insulation bag. 400 N or more, tear strength 50 N or more, wear resistance grade 4 or more.

  As the fiber used for the fabric, any of natural fiber, chemical fiber, synthetic fiber and the like can be used. Of these, synthetic fibers having excellent rigidity are preferred. For example, polyester (polyethylene terephthalate, polybutylene terephthalate, polytrimethylene terephthalate, polylactic acid, etc.) fiber, polyamide (nylon 6, nylon 11, nylon 12, nylon 66, nylon 610, nylon 510, etc.) fiber, polyolefin (polyethylene, polypropylene) ) Fiber, polyacetal fiber, acrylic fiber, and aramid fiber. Of these, polyester fibers and polyamide fibers having low rigidity and excellent rigidity are more preferable. Moreover, when heat-sealing the junction part of a heat insulation bag, since the low melting-point polyester film is used as an adhesive material, it is preferable that the fiber of a fabric is a polyester fiber. By doing so, the polyester resins are firmly bonded to each other, and a bonded portion having a high tensile strength can be obtained.

  Multifilaments are preferred as the fibers used in the woven fabric, and the single yarn fineness is preferably 1 to 20 dtex, more preferably 2 to 10 dtex, still more preferably 3 to 7 dtex. The number of filaments is preferably 10 to 150, more preferably 20 to 100, and still more preferably 30 to 80. The total fineness is preferably 10 to 3000 dtex, more preferably 100 to 1500 dtex, and still more preferably 200 to 1000 dtex. The weave density is preferably 20 to 150 pieces / 2.54 cm, more preferably 25 to 100 pieces / 2.54 cm, and still more preferably 30 to 70 pieces / 2.54 cm. The cover factor is preferably 1,000 to 3,000, more preferably 1,100 to 2,700, and still more preferably 1,200 to 2,500. As described above, by using a fabric having excellent rigidity and flexibility, it is easy to process the heat insulating material, and a heat retaining bag having excellent durability can be obtained.

  The fabric in the present invention preferably has effects such as light resistance, antifouling property, water repellency, flame retardancy, antistatic property, rust prevention property and antiseptic property. Moreover, it is preferable that the antioxidant process and the surface protection process are performed. By doing so, the thermal insulation bag can be used for a long time.

  As described above, the configuration of the skin material in the present invention is preferably [laminated film / fabric], and the fabric and the laminated film are preferably bonded. The adhesive layer may be anything as long as it can adhere the fabric and the laminated film. For example, vinyl, acrylic, polyamide, polyester, polyether, polyurethane, epoxy, polyester polyurethane, etc. There are other curing type and thermosetting type adhesives. There is also a method of bonding the fabric by heat sealing by making the surface of the laminated film a low melting point film.

[Production method of heat insulating material]
The heat insulating material manufacturing method according to the present invention includes, for example, a bag body made of a skin material, a fiber assembly is placed therein, the inside is replaced with a low thermal conductivity gas, and the opening of the bag body is finally closed. There is a method of sealing.

  As a method of manufacturing a bag body with an outer skin material, two outer skin materials having the same shape and size are stacked, and two or three sides thereof are bonded together, or one outer skin material is folded in half. There is a method of bonding two sides or two sides. As a method for adhering the skin material, a method in which a heat seal layer is provided on the surface of the skin material in advance and heat sealing or a method of attaching with an adhesive can be employed. The adhesive used here is not particularly limited, but an adhesive having low adhesive strength and gas permeability is preferable. An example thereof is an adhesive for dry lamination. Examples of the adhesive for dry lamination include vinyl type, acrylic type, polyamide type, polyester type, polyether type, polyurethane type, epoxy type, and the like, and there are a two-component type adhesive and a thermosetting type adhesive.

  As a method of wrapping the fiber aggregate in the bag body, a bag body is manufactured in advance from an outer skin material, and the fiber aggregate body is inserted into the bag body, or the opening is closed after the fiber aggregate body is wrapped in the outer skin material. A method can also be employed. As a method of closing the opening after wrapping the fiber aggregate with the outer skin material, it is possible to use a horizontal bag making and filling machine, a three-side seal packing machine, or an upper wrapping machine such as a four-side seal packing machine.

  As a method of filling the inside of the heat insulating material with the low thermal conductivity gas, there is a method of replacing the air inside by inserting a gas supply pipe into the bag body containing the fiber assembly and blowing the gas. preferable. When blowing a low thermal conductivity gas into the bag body, a method of sucking air from the same place as where the pipe for supplying the gas of the bag body is inserted, or a different place from one or more places, or including a fiber assembly It is preferable to use a method of releasing the compressing force and blowing the gas at the same time after compressing the bag body and extruding the air inside, because the inside of the heat insulating material can be quickly replaced with gas. After the low thermal conductivity gas inside the heat insulating material reaches a desired concentration, a sealed structure can be made by bonding all the outer circumferences of the outer skin material. Since the outer part (ear part) to which the end of the heat insulating material is bonded becomes a joint part for sewing and heat sealing when the heat insulation bag is processed, it is preferable to make an ear part having a width of 1 cm or more.

The heat insulating material of the present invention thus obtained has low thermal conductivity, excellent heat insulating performance, excellent flexibility, and a bending strength of 20 N / cm ² or less. As a result, the heat insulating material can be folded and processed into the shape of a heat insulating bag. The bending strength is more preferably 15 N / cm ² or less, and still more preferably 10 N / cm ² or less.
FIG. 1 shows a cross-sectional view of an example of the heat insulating material of the present invention. The fiber structure 2 is covered with a skin material 1. In the heat insulating material of FIG. 1, two outer skin materials are used and are bonded at the bonding portion 3.

[Insulation bag]
In the heat insulation bag of the present invention, a plurality of the above-mentioned heat insulating materials are overlapped, and a hollow portion is provided between any of the heat insulating materials. Put something you want to keep warm in it. Therefore, a bag-like form with a part opened is preferable. The shape may be polygonal or circular when viewed in the plane direction. In the case of a quadrangular shape, part or all of one side thereof may be opened, and two sides and three sides may be opened. For example, the heat insulation bag is manufactured by folding a heat insulating material from one heat insulating material to form two or more layers of heat insulating materials. And the edge part of the edge of a heat insulating material joins one side or two sides, a hollow part is made between an upper heat insulating material and a lower heat insulating material, and it is set as a bag. Moreover, when producing from two or more heat insulating materials, the heat insulating material which piled up two or more heat insulating materials first is made. And the edge part of the edge of a heat insulating material joins 2 sides or 3 sides, a hollow part is made between an upper heat insulating material and a lower heat insulating material, and it is set as a back | bag. The joining portion may be anything as long as it is joined. For example, sewing, heat sealing, a two-component curing type, a thermosetting type adhesive, or the like can be used. Sewing is done using a sewing machine to sew synthetic fibers. When sewing, be sure to sew the ears so that there are no holes in the gas filling part. In heat sealing, a low melting point film is placed as an adhesive on the ear portion between the upper and lower heat insulating materials, and the low melting point film is melted and joined by heat. Two-component effect type adhesives include vinyl, acrylic, polyamide, polyester, polyether, polyurethane, and epoxy. This adhesive is applied to the ear portion, and the upper and lower heat insulating materials are bonded together. The joining portion preferably has a tensile strength of 50 N or more, more preferably 100 N or more, and still more preferably 900 N or more so that it can withstand long-term use of the heat insulation bag.

  Moreover, the cover part 12 can be attached to the heat insulation bag main body 11 as shown in FIG. By keeping the lid part folded and closing the hollow part 13 to the heat insulation bag body, the heat insulation property of the bag is improved. In this case, the lid part may be prepared separately from the heat insulation bag body and joined to the heat insulation bag, or one heat insulating material may be made larger than another heat insulating material used at the same time and be folded back in the middle Also good. In particular, since the heat insulating material of the present invention has a cloth, when used as a lid, it can be easily attached by sewing or heat sealing. Further, means for joining the heat insulating bag body and the lid, for example, a clip, a button (in this case, one is a button hole), and a hook-and-loop fastener can be used.

  Since the heat insulation bag in the present invention is composed of a heat insulating material having low thermal conductivity and excellent long-term durability, an excellent heat insulation effect can be obtained. In the heat insulation test using 300 ml of 80 ° water, the temperature change after 1 hour is preferably less than 20 ° C, more preferably less than 15 ° C after 1 hour.

  The heat insulating material of the present invention has excellent heat insulating properties, is lightweight and flexible, and has long-term durability, and is therefore optimal for heat insulation bags. As a use of the heat insulation bag using this, since both warmth and coldness can be maintained, it can be suitably used for, for example, a pizza bag for home delivery, a lunch box bag, a drinking water bag, an ice bag and the like.

Examples are introduced below.
[Measuring method]
(1) Fiber assembly Average fiber diameter Measured according to JIS A 9504 (2001) 6.7. The diameter of the fiber is about 20g from 3 parts of the raw fiber used for heat insulation, and 20 fibers are taken from each, and the outer diameter (diameter of circumscribed circle) is taken with a magnifying glass using a scanning electron microscope. ) And take an average value (n = 60). The fiber diameter is measured with an accuracy of 0.1 μm.

B. Fiber length Measured according to JIS A 1015 (1999) 8.4.1. Weigh 800 mg of sample, create a staple diagram, divide the illustrated staple diagram into 50 fiber length groups, measure the boundary of each segment and the fiber length at both ends, and find 49 boundaries at the average fiber length at both ends The fiber length was added and divided by 50, the average fiber length (mm) was calculated, and the average value was taken twice.

C. Density The density was measured according to JIS A 9504 (2001) 6.4.2.3. Density is obtained by the following equation by determining the mass and volume of the sample. The density was determined by calculating the average value of the number of tests 3 times, and the volume and mass were similarly measured and calculated 3 times.
p = m / V
Here, p: density (kg / m ³ )
m: mass (kg)
V: Volume (m ³ )
The volume can be obtained from the following equation.
V = t × w × L
Where t: thickness (mm)
w: Width (mm)
L: Length (mm).

      The thickness is measured by the following method. First, a 450 × 450 mm test piece is placed on a hard flat plate, and a rigid load plate with a mass of 100 g and 150 × 150 mm is used inside 100 mm or more from the end of the test piece, and through a hole formed in the center of the load plate. Insert a needle-like object and measure after 1 minute or more has passed and the load plate has stopped sinking. Insert the needle-shaped one after placing the load plate. In the case of a compressed package, the sample is held on both sides in the width direction by hand, shaken well so as to wave in the horizontal direction, placed on a hard plate, and measured after 4 hours by the above method.

      The mass was measured to an accuracy of 0.1 g with an electronic balance after leaving the test sample used for thickness measurement in a standard state of a temperature of 20 ° C. and a humidity of 65% RH for 24 hours.

(2) Gas A. Gas filling concentration (carbon dioxide)
Analysis and measurement were performed by a GC / MS apparatus equipped with a headspace analyzer. Helium gas having a purity of 99.8% was used as the carrier gas.

      a. As a baseline, the helium peak of the carrier gas was detected, and the peak area (BPh) was calculated.

      b. Next, 5 cm or more of a sampling needle was inserted in the most longitudinal direction of the heat insulating material, and 5 mL of gas inside the heat insulating material was sampled.

      c. The sampling gas was mixed with helium carrier gas and injected into the column of the GC / MS apparatus.

      d. The peaks of helium, nitrogen, oxygen, hydrocarbons, and carbon dioxide are detected by MS analysis of the gas separated by GC, and the peak areas (helium: Ph), (nitrogen: Pn), (oxygen: Po) are detected. , (Hydrocarbon: Phc), (carbon dioxide: Pc).

e. The concentration of carbon dioxide gas in the heat insulating material was calculated from the obtained peak area by the following formula. Carbon dioxide concentration [%] = {Pc / (Ph−BPh + Pn + Po + Phc + Pc)}
× 100.

    f. The number of samples to be measured was 5 samples (n = 5), and the average of 5 times was the carbon dioxide gas concentration.

B. Gas filling concentration (other than carbon dioxide)
The oxygen concentration in the atmosphere and the oxygen concentration inside the heat insulating material were measured with an oxygen concentration meter (manufactured by Shin Cosmos Electric Co., Ltd., XO-326ALB), and obtained by the following equation.
[Filling gas concentration (w%)] = 100− [Oxygen concentration inside heat insulating material (w%)]
÷ [Oxygen concentration in the atmosphere (w%)] × 100.

(3) Skin material A. Film thickness Samples were taken from 10 locations of the film used for the skin material, the thickness of the film was measured with a magnifier using a scanning electron microscope, and an average value was obtained (n = 10). The film thickness is measured with an accuracy of 0.01 μm.
B. The fabric weight was measured in accordance with JIS L 1096 (1999) 8.4.2.
C. Fabric thickness Measured according to JIS L 1096 (1999) 8.5. The thickness is measured using Type: SM-123 of TECLOCK, and an average value is taken (n = 10). The fabric thickness is measured with an accuracy of 0.01 mm.
D. Textile texture Measured according to JIS L 1096 (1999) 8.1.1.
E. Woven single yarn fineness Based on JIS L 1013 (1999) 8.3.1 A method, skeins of 112.5 m are sampled 5 times, the mass is measured, and the value (g) is 10000 / 112.5. And the apparent fineness (dtex) was determined. From the apparent fineness, a positive fineness was determined by the following formula, and an average value was calculated.
Positive fineness (dtex) = D ′ × (100 + Rc) / (100 + Re)
Where D ′: apparent fineness (dtex)
Rc: Official moisture content (%)
Re: Equilibrium moisture content (%).
F. Number of woven filaments
It measured according to JIS L 1013 (1999) 8.4. For the number of filaments, the number of filaments constituting the yarn was counted.
G. Total fineness of fabric The total fineness was obtained by the following formula.

Total fineness (dtex) = single yarn fineness (dtex) × number of filaments (number).
H. Woven density Measured according to JIS L 1096 (1999) 8.6.1. The number of warp yarns and weft yarns was counted between 2.54 cm, and the average value of n = 10 was calculated.
I. Fabric cover factor The cover factor was determined by the following equation.

Cover factor = (total warp fineness) ^1/2 x (warp weave density) +
(Weft total fineness) ^1/2 x (weft weave density).

J. et al. Carbon dioxide gas permeability Measured according to the gas chromatographic method of JIS K7126-2 (2006). Carbon dioxide permeability was measured using a gas permeability measuring device (GL Science: GPM-250) under conditions of a temperature of 23 ° C. and a humidity of 0% RH. The measurement was performed three times, and the average value of the three measured values was defined as the carbon dioxide gas permeability value.

K. Water vapor transmission rate
The measurement was performed according to the infrared sensor method described in JIS K7129 (2008). The water vapor transmission rate was measured under the conditions of a temperature of 40 ° C. and a humidity of 90% RH using a moisture permeability measuring device (MOCON, USA: “Permatran” (“PERMATRAN-W3 / 31”)). The measurement was performed twice, and the average value of the two measurements was taken as the value of water vapor transmission rate.

L. Tensile strength Measured according to JIS L 1096 (1999) 8.12.1 A method (strip method). Three test pieces of 25 × 200 mm are collected from each sample. A tensile test was performed with a constant speed tension type at a gripping interval of 100 mm and a tensile speed of 150 mm / min, the maximum point strength at that time was determined, and an average value was calculated.

M.M. Tear strength Measured according to JIS L 1096 (1999) 8.15.1 A-1 method (single tongue method). Three test pieces of 100 × 250 mm are collected from each sample. A 100 mm cut is made in the middle of the short side of the test piece at right angles to the side. A tear test was performed at a gripping interval of 100 mm and a tearing speed of 100 mm / min, the maximum point strength at that time was determined, and an average value was calculated.

N. Abrasion resistance Measured according to JIS L 1096 (1999) 8.17.3 C method (Taber method). Three test pieces each having a diameter of 130 mm are collected from the sample. A 6 mm diameter hole is made in the center of the test piece. A wear test was performed at a wear wheel CS-10, a load of 4.9 N, a test count (sample holder rotation speed) of 100 times, and a sample holder rotation speed of 70 rpm. The determination was performed as follows, and the lowest value of 3 sheets was used as the value. It should be noted that the wear wheel must be regenerated before the test is started, and the surface is regenerated by attaching abrasive paper S-11 to the sample holder, loading 4.9 N, number of tests (sample holder rotation speed) 50 times, sample holder The rotation was performed at 70 rpm. The abrasive paper shall be replaced with a new one once used.
[Judgment]
Grade 5: No wear condition is observed. Grade 4: Wear condition is slightly noticeable but almost inconspicuous. Grade 3: Wear condition is clearly recognized, but less noticeable. Grade 2: Wear condition is slightly higher. Remarkable 1st grade: Abrasion is very remarkable.

(4) Thermal insulation Thermal conductivity Measured according to JIS A 1412-2 (1999) 6.2. The thermal conductivity was measured using a thermal conductivity measuring device HC-074 manufactured by Eihiro Seiki Co., Ltd. The sample size prepared the heat insulating material of width 300mm, length 300mm, and thickness 50mm. As the standard sample, expanded polystyrene was used. The sample is left in a standard condition of a temperature of 20 ° C. and a humidity of 65% RH for 24 hours, and then the sample is put into a measuring machine, the temperature difference of the plate is 25 ° C., the average temperature is 20 ° C. (the high plate temperature is 32.5 ° C., the low temperature The plate temperature was 7.5 ° C.), and the thermal conductivity (W / m · K) was calculated from the average value of the number of tests three times.

B. durability
When the low heat transfer rate gas is diffused from the inside of the heat insulating material, the thermal conductivity decreases. In the acceleration test, it was confirmed that the low thermal conductivity gas was difficult to diffuse from the skin material. The heat insulating material was exposed for 3000 hours in an atmosphere of a temperature of 60 ° C. and a humidity of 15% RH, and then the thermal conductivity was measured and determined as follows.
[Judgment]
A: Increase in thermal conductivity is less than 20%. O: Increase in thermal conductivity is less than 30%. X: Increase in thermal conductivity is 30% or more. Flexibility “Bending strength” was measured according to JIS K7221-2 (2006). Three samples each having a width of 25 mm, a length of 120 mm, and a thickness of 20 mm were taken in each of the vertical direction and the horizontal direction. Using a Shimadzu Corporation autograph (AG-50kG), the maximum point of bending strength was measured at a distance between supporting points of 100 mm and a bending speed of 10 mm / min, and an average value of 6 pieces was calculated.

(5) Thermal insulation bag Tensile strength of joint part was measured according to JIS L 1093 (1995) 6.1 (grab method). Samples of 100 mm in the direction parallel to the joint part (seam) and 150 mm in the direction perpendicular to the joint part (seam) are sampled from the sample. A tensile test was performed at a grip interval of 76 mm and a tensile speed of 300 mm / min, the maximum point strength at that time was determined, and an average value was calculated.

B. Heat retention 300 ml of 90 ° C. water was placed in a polypropylene container (Ziploc container, round shape, content: 415 ml, manufactured by Asahi Kasei Co., Ltd.), and a thermocouple was inserted into the middle layer of the water and covered. The container was placed in a heat insulation bag and the temperature change of the water was measured. The heat insulation bag was tested in a constant temperature and humidity chamber (temperature 20 ° C., humidity 50% RH). The measuring instrument was connected to a thermocouple using a temperature recorder (THEMO RECORDER RT-11 manufactured by Espec Corp.), and the temperature change was recorded. The heat retention property was defined as a temperature drop when one hour had passed since the water temperature was 80 ° C. The determination was performed as follows.
[Judgment]
A: Temperature change after 1 hour is less than 15 ° C. ○: Temperature change after 15 hours 15 ° C. to 20 ° C. x: Temperature change after 20 hours exceeds 20 ° C.

[Examples 1 to 17]
(Fiber assembly)
The fiber assembly was produced by the following method.
The fiber A has an average fiber length of 35 mm, a single fiber fineness of 0.8 dtex, a polyethylene terephthalate short fiber (Toray Co., Ltd. “Tetron” (registered trademark)) having a fiber diameter of 10 μm, and the fiber B has an average fiber length of 51 mm and a single fiber fineness of 6. Polyethylene terephthalate short fiber (Toray Corp. “Tetron” (registered trademark)) with 6 dtex and fiber diameter of 30 μm, average fiber length 51 mm as fiber C, single fiber fineness 2.2 dtex, fiber diameter 14.2 μm, core fiber diameter 10 1.0 μm core-sheath composite fiber of polyethylene terephthalate short fiber (sheath component: low melting point polyethylene terephthalate (melting point 110 ° C.), core component: homopolyethylene terephthalate (melting point 255 ° C.), sheath ratio 50% by mass, Toray Industries, Inc. “Safmet (Registered trademark) T9611).

First, fibers A, fibers B, and fibers C were mixed and opened using a card machine so that the mixing ratio shown in Table 1 was obtained, and a uniform web was formed. Next, the web was laminated so that the mass per unit area was 0.25 to 2.5 kg / m ^2, and sandwiched between two perforated iron plates with a spacer having a thickness of 25 mm, and a hot air dryer ( The binder fiber was melted by heating at a preset temperature of 170 ° C. for 20 minutes to form a fiber aggregate having a density of 10 to 100 kg / m ³ and a thickness of 25 mm as shown in Table 1.

(gas)
As shown in Table 1, carbon gas, argon gas, and krypton gas were used as gas types.

(Skin material)
The outer skin material was prepared by the following method.
The laminated film and the fabric were bonded together by the dry lamination process with the configuration shown in Table 1. Dry laminate processing uses polyester polyurethane system of main agent ("Dick Dry" (registered trademark) LX-500, manufactured by Dainippon Ink & Chemicals, Inc.) and curing agent (KW-75, manufactured by Dainippon Ink & Chemicals, Inc.). It was. The gas barrier film, the laminated film, and the fabric were prepared by the following method.

[Gas barrier film: AL / PBT / PGA / PET film]
Polyethylene terephthalate resin: PET (“Mitsui PET J120” manufactured by Mitsui Chemicals, Inc.) and polybutylene terephthalate: PBT (“1200S” manufactured by Toray Industries, Inc.) ) Was mixed and supplied at a mass ratio of 40:60. Next, polyglycolic acid resin: PGA (prepared as in Note 1) was supplied to Extruder B connected with the pinole by a short tube. Extruders A and B were heated to 160 to 280 ° C. and 160 ° C. to 240 ° C., respectively, and extruded from the T die into a sheet shape so that the lamination ratio (thickness) was 4: 1. . The extruded sheet is wound around a mirror drum having a temperature of 20 ° C. to be cooled and solidified, stretched three times in the longitudinal direction using a stretching roll having a preheating temperature of 50 ° C. and a stretching temperature of 55 ° C., and then a preheating temperature of 50 ° C. The film was stretched 3 times in the width direction using a tenter having a stretching temperature of 53 ° C. Next, heat treatment was carried out at 180 ° C. for 10 seconds while giving 5% relaxation in the width direction to obtain a biaxially stretched film.

The film was wound by corona discharge treatment at 30 W · min / m ² while maintaining the film temperature at 55 ° C. in a mixed gas atmosphere of nitrogen and carbon dioxide (carbon dioxide concentration ratio: 15 vol%). It set in the vacuum evaporation apparatus which equipped the film travel apparatus, and after making it the high pressure reduction state of 1.00 * 10 ^<-2 > Pa, it was made to travel through a 20 degreeC cooling metal drum. At this time, aluminum (“High-Purity Aluminum Wire” manufactured by Nippon Light Metal Co., Ltd.) was evaporated by heating to form a deposited thin film layer on the surface on which the resin polyglycolic acid resin was laminated. After vapor deposition, the inside of the vacuum vapor deposition apparatus was returned to normal pressure, and the wound film was wound up and aged at a temperature of 40 ° C. for 2 days to obtain a resin film with a vapor deposition layer. The optical density of the metal layer was confirmed in-line during vapor deposition, and the optical density was controlled to be 2.5. The thickness of the obtained resin film with a vapor deposition layer was 20 micrometers.

(Note 1: Preparation method of polyglycolic acid resin (PGA))
A 70% glycolic acid aqueous solution was heated to 180 ° C. under a nitrogen stream, and then gradually reduced in pressure to 1.0 × 10 −2 MPa to concentrate glycolic acid. When about 30% by mass of water was distilled out with respect to the amount of glycolic acid aqueous solution, about 0.14% of triphenyl phosphite was added with respect to the amount of glycolic acid aqueous solution. After 5 minutes, antimony trioxide and ethylene glycol were added in an amount of about 0.13% and 0.57%, respectively, with respect to the amount of glycolic acid aqueous solution. ^{When the} reaction product started to solidify at ⁻⁴ MPa, the stirring rod was raised above the reaction liquid surface, and the reaction was further performed until the reaction product was completely solidified. After completion of the reaction, the reaction product was cooled to room temperature under a nitrogen atmosphere and pulverized to a powder state. This finely divided low polymer was subjected to a polycondensation reaction at 200 ° C. and 5.0 × 10 ⁻⁴ MPa for 40 hours to obtain a light yellow polyglycolic acid which was hardly colored. In addition, the obtained polyglycolic acid was used as a phenol / 2,4,5-tetrachlorophenol mixed solvent (10/7 (mass ratio)) solution having a concentration of 0.5 g / dl at 30.0 ± 0.1 ° C. Using an Ubbelohde viscometer, ηsp / C was determined to be 0.63. Further, from 1H-NMR analysis of this polymer, it was confirmed that 0.004 mol of ethylene glycol unit was contained in 1 mol of glycolic acid unit in the molecular chain of the polymer.

[Gas barrier film: AL / PET film]
A polyethylene terephthalate resin (“Mitsui PET J120” manufactured by Mitsui Chemicals, Inc.) was supplied to a single screw extruder, heated to 160 to 280 ° C., and extruded from a T die into a sheet. The extruded sheet is wound around a mirror drum having a temperature of 20 ° C. to be cooled and solidified, and stretched three times in the longitudinal direction using a stretching roll having a preheating temperature of 80 ° C. and a stretching temperature of 100 ° C., and then a preheating temperature of 90 ° C. Using a tenter with a heating temperature of 120 ° C., the film was stretched 3 times in the width direction. Next, heat treatment was performed at a temperature of 180 ° C. for 10 seconds while giving 5% relaxation in the width direction to obtain a resin film. The film was wound by corona discharge treatment at 30 W · min / m ² while maintaining the film temperature at 55 ° C. in a mixed gas atmosphere of nitrogen and carbon dioxide (carbon dioxide concentration ratio: 15 vol%). It set in the vacuum evaporation apparatus which equipped the film travel apparatus, and after making it the high pressure reduction state of 1.00 * 10 ^<-2 > Pa, it was made to travel through a 20 degreeC cooling metal drum. At this time, aluminum (“High-Purity Aluminum Wire” manufactured by Nippon Light Metal Co., Ltd.) was heated and evaporated to form a deposited thin film layer on one side. After vapor deposition, the inside of the vacuum vapor deposition apparatus was returned to normal pressure, and the wound film was wound up and aged at a temperature of 40 ° C. for 2 days to obtain a resin film with a vapor deposition layer. The optical density of the metal layer was confirmed in-line during vapor deposition, and the optical density was controlled to be 2.5. The thickness of the obtained resin film with a vapor deposition layer was 20 micrometers.

[Gas barrier film: EVA film]
Using ethylene vinyl alcohol resin (Kuraray “Eval” (registered trademark)), preheated at 50 ° C. and stretched at 70 ° C., stretched three times in the longitudinal direction using a stretching roll, immediately cooled to room temperature and preheated The film was stretched 3 times in the width direction using a tenter at a temperature of 90 ° C. and a stretching temperature of 120 ° C., and then heat-treated at a temperature of 160 ° C. for 10 seconds while giving 5% relaxation in the width direction to obtain a biaxially stretched film. . The thickness of the obtained resin film was 20 μm.

[Laminated film]
The laminated film was prepared by the following method using a gas barrier film, a surface protective film, and a heat seal film.
Applying an acrylonitrile-based coating agent as a primer to the resin surface opposite to the metal vapor deposition surface of the gas barrier film, and bonding the OPP of the surface protection film to the metal vapor deposition surface and PE of the heat seal film to the resin surface by dry laminating, A laminated film having a thickness of 85 μm was obtained. OPP is a 15 μm-thick polypropylene film (Toray Industries, Inc. “Trephan” (registered trademark) BO), and PE is a 50 μm-thick polyethylene film (Toray Industries, Ltd. “Toraytec” (registered trademark)). Using. In addition, the dry laminating process is a polyester polyurethane system based on the main agent (Dick Dry (registered trademark) LX-500, manufactured by Dainippon Ink & Chemicals, Inc.) and a curing agent (KW-75, manufactured by Dainippon Ink & Chemicals, Inc.). Was used.

[Fabric]
As the fabric, plain fabrics having the configurations shown in Tables 1 and 4 were prepared.

(Insulation material)
The heat insulating material was produced by the following method.
Two skin materials were cut into a size of 425 × 925 mm, and the surfaces of the polyethylene film were aligned and laminated. Then, three sides were thermally bonded with an impulse sealer to make a bag. Next, the fiber assembly was cut into a size of 300 × 800 mm and inserted into the bag. Subsequently, a hose connected to the gas cylinder was inserted to the back of the bag body, and after the gas concentration reached the desired concentration shown in Table 1, the opening of the bag body was thermally bonded with an impulse sealer and sealed.

(Insulation bag)
The heat insulation bag was created by the following method.
The heat insulating material is folded at a length of 500 mm to form a two-layer heat insulating material having an upper portion of 300 mm wide × 300 mm long × 25 mm thick and a lower portion of 300 mm wide × 500 mm long × 25 mm thick. Next, the edge part of the end of the heat insulating material was joined on two sides, a hollow portion was formed between the upper and lower heat insulating materials, and a back was prepared. The long part of the lower heat insulating material was a lid. As shown in Table 3 and Table 6, the joined portions were joined by sewing or heat sealing, respectively. Sewing was performed using a single-needle lockstitch sewing machine (DDL-5530N manufactured by JUKI Corporation) at a constant pitch (46 stitches between 10 cm). Polyester fibers (single yarn fineness 7.0 dtex, number of filaments 200) were used for the upper yarn and the lower yarn. Heat seal is a low-melting polyester film ("Chemit" (registered trademark) manufactured by Toray Industries, Inc.) placed as an adhesive on the ear between the upper and lower insulations, and melted with an impulse sealer. Joined by heat sealing.

[Comparative Example 1]
A polyethylene film was used as the film used for the outer skin material, and a heat insulating material and a heat insulation bag were prepared in the same manner as in Example 3 with the configuration shown in Table 2.

[Comparative Example 2]
In the configuration shown in the table, a heat insulating material and a heat insulating bag were created in the same manner as in Example 1 without filling gas (inside air).

[Comparative Example 3]
The vacuum heat insulating material and the heat insulation bag were created by the following method with the structure shown in the table.
Two skin materials were cut into a size of 425 × 425 mm, and the surfaces of the polyethylene film were aligned and laminated. Then, three sides were thermally bonded with an impulse sealer to make a bag. Next, a fiber assembly having a density of 150 kg / m ³ and a thickness of 25 mm was cut into a size of 300 × 300 mm and inserted into the bag. Subsequently, vacuum evacuation was performed using a vacuum drawing device so that the internal pressure was 0.01 Torr, and the opening of the bag was thermally bonded with an impulse sealer and sealed. Two vacuum heat insulating materials were prepared. Two heat insulating materials were overlapped, and the edge portions of the end of the heat insulating material were joined on three sides, and a hollow portion was formed between the upper and lower heat insulating materials to form a back. The joined portion was joined by sewing as described in Example 1. Prepare two sheets of 300 x 200 mm fiber aggregates and 425 x 325 mm outer skin as the lid, create a heat insulating material by the same method as above, and sew it to the entrance of the hollow part of the back to make the lid .

[Comparative Example 4]
The heat insulating material and the heat insulation bag were created by the following method with the structure shown in the table.
Two skin materials were cut into a size of 425 × 425 mm, and the surfaces of the polyethylene film were aligned and laminated. Then, three sides were thermally bonded with an impulse sealer to make a bag. Next, “Styro Ace (registered trademark, the same applies hereinafter) II” (3 types b, A-XPS-B-3b, thickness 25 mm) manufactured by Dow Chemical Co., Ltd., which is an extruded polystyrene foam, is 300 × 300 mm. And was inserted into the bag. Subsequently, vacuum evacuation was performed using a vacuuming device so that the internal pressure was 0.5 Torr, and the opening of the bag was thermally bonded with an impulse sealer and sealed. Two of these heat insulating materials were prepared. Two heat insulating materials were overlapped, and the edge portions of the end of the heat insulating material were joined on three sides, and a hollow portion was formed between the upper and lower heat insulating materials to form a back. The joined portion was joined by sewing as described in Example 1. Prepare 2 pieces of “Styro Ace” II (300 × 200 mm) and 2 425 × 325 mm outer skin as the lid, create a heat insulating material in the same way as above, and sew it at the entrance of the back hollow part. It was.

[Comparative Example 5]
The heat insulating material and the heat insulation bag were created in the same manner as in Example 1 with the configuration shown in Table 1 using only the laminated film without using the fabric used for the outer skin material.

[Comparative Example 6]
A heat insulating material and a heat insulation bag were prepared in the same manner as in Example 1 with the configuration shown in Table 1 by using only the fabric without using the film used for the outer skin material. The filling gas inside the heat insulating material was replaced with air after 1 day.

  The structure and evaluation result of the heat insulating material of an Example and a comparative example are shown in a table | surface. Examples 1 to 11 are shown in Tables 1 to 3, Examples 11 to 17 and Comparative Examples 1 to 6 are shown in Tables 4 to 6. Further, the structures of the fiber aggregate and gas are shown in Tables 1 and 4, the structures and characteristics of the outer skin material are shown in Tables 2 and 5, and the performance of the heat insulating material and the heat insulating bag are shown in Tables 3 and 6.

  In the present invention, films and fibers are used, and the heat insulation bag can be used in the food field.

1: Skin material 2: Fiber structure 3: Bonding portion 11 Insulation bag body 12: Lid portion 13: Hollow portion

Claims (7)

A heat insulating material in which a fiber aggregate and gas are packaged with a skin material, wherein the gas has a thermal conductivity of 0.0266 W / m · K or less, and the carbon dioxide gas permeability of the skin material is 15 ml / m ² · a heat insulating material characterized in that the outer skin material has a fabric laminated on at least one surface of the thin film and the thin film. The heat insulating material according to claim 1, wherein the thin film constituting the outer skin material is a film. 3. The film according to claim 2, wherein the film is a laminated film having a plurality of layers, and has one or more layers selected from one or more resins of ethylene vinyl alcohol copolymer, polyvinyl alcohol, polyglycolic acid, and polyethylene terephthalate. The heat insulating material as described in. The said fiber assembly contains 70 mass% or more of fibers with a fiber diameter of 15 μm or less with respect to the total mass, and has a density of 150 kg / m ³ or less. Insulation material. The said heat insulating material is bending strength 20N / cm < ² > or less, The heat insulating material in any one of Claims 1-4 characterized by the above-mentioned. The fabric is a woven fabric having a basis weight of 50 to 400 g / m ^2, thermally insulating material, according to any one of claims 1 to 5, characterized in that by using a polyester fiber or nylon fiber.   The heat insulation bag which the heat insulating material in any one of Claims 1-6 overlaps, and has a hollow part between heat insulating materials.