JP5907204B2 - Manufacturing method of vacuum insulation - Google Patents

Description

  The present invention relates to a vacuum heat insulating material that can be bent or the like.

In recent years, reduction of greenhouse gases has been promoted in order to prevent global warming, and energy saving is required for electrical products, vehicles, equipment and buildings.
Among these, from the viewpoint of reducing power consumption, the use of vacuum heat insulating materials for electrical products and the like is being promoted. In equipment that has a heat generating part inside the main body, such as electrical products, and equipment that has a heat retaining function using heat from the outside, it is possible to improve the heat insulation performance of the equipment as a whole by providing a vacuum heat insulating material It becomes. For this reason, efforts are being made to reduce the energy of devices such as electrical products by using vacuum heat insulating materials.

  The vacuum heat insulating material is formed by covering a core material such as a foamed resin or a fiber material with an outer packaging material, enclosing the core material in the outer packaging material to form a vacuum inside, and the end of the outer packaging material is formed by thermal welding. It is formed by being sealed. Since the vacuum heat insulating material is in a vacuum state, heat transfer due to air convection is blocked, so that high heat insulating performance can be exhibited.

However, since such a vacuum heat insulating material is usually flat and has high rigidity, there is a problem that workability such as bending is poor.
For example, when a vacuum heat insulating material is wound around a cylindrical tank, piping or the like in a water supply device or piping facility, the vacuum heat insulating material is difficult to bend and is difficult to wind tightly.
Further, in a heat insulating box body having a cold insulation function such as a refrigerator, a vacuum heat insulating material is usually arranged inside a wall surface composed of an inner wall and an outer wall, but the wall surface has a small area and is complicated in shape. For this reason, a flat vacuum heat insulating material cannot provide a large arrangement area. For this reason, it is necessary to bend and arrange | position according to the shape of a wall surface, and since the said vacuum heat insulating material has rigidity, it is difficult to follow the shape of a wall surface. In particular, it is necessary to bend the vacuum heat insulating material at an angle close to a right angle at the end or corner of the heat insulating box, and it is difficult to arrange the vacuum heat insulating material so as to follow the shape of the end or corner.
Further, when the vacuum heat insulating material is not disposed in close contact with an attachment site such as a pipe or a wall surface, a gap is formed between the attachment site and the vacuum heat insulating material, and heat leaks from the gap. For this reason, there exists a problem that the heat insulation effect by arrange | positioning a vacuum heat insulating material is hard to be acquired.
Therefore, development of a vacuum heat insulating material having flexibility has been advanced so that it can be attached to a portion having a complicated shape such as a curved surface portion or a corner portion.

  For example, Patent Document 1 discloses a vacuum heat insulating material in which a molded tray-shaped exterior body having concave and convex grooves is used, and a large number of rod-like porous thermal insulators are arranged along the concave and convex grooves inside, and the wall becomes thin. The vacuum heat insulating material can be bent in the uneven groove portion. Moreover, in patent document 2, the vacuum heat insulating material with which the core material and the corrugated sheet-like aggregate were covered with the outer packaging material is disclosed, and the uneven | corrugated shape which the said vacuum heat insulating material followed the corrugated sheet shape of the said aggregate Therefore, it can be bent and used, and the restoring force of the vacuum heat insulating material generated at that time can be reduced.

JP-A-7-151297 JP 2007-263186 A

However, in the vacuum heat insulating material of Patent Document 1, when a large number of rod-shaped porous heat insulators are disposed in the exterior body, a space in which the heat insulator is not disposed is generated. Therefore, when the degree of vacuum in the space decreases with time, heat transfer due to air convection is likely to occur in the space, resulting in a problem that heat insulation performance is deteriorated.
Moreover, in the vacuum heat insulating material of patent document 2, when using a metal as an aggregate, since the thermal conductivity of the said aggregate is high, there exists a problem that the heat insulation performance of a vacuum heat insulating material falls. Furthermore, even when an aggregate made of a material other than a metal is used, the outer packaging material is broken by the convex portions of the aggregate when bent, and the internal vacuum cannot be maintained. There is also a problem that the heat insulation performance of the material is lowered.

  The present invention has been made in view of the above circumstances, and is capable of processing such as bending, a vacuum heat insulating material, a method for producing such a vacuum heat insulating material, and a vacuum heat insulating material envelope used for such a vacuum heat insulating material. The main object is to provide materials and heat-insulating articles.

  In order to solve the above-mentioned problems, the present invention is a vacuum heat insulating material having a core material and an outer packaging material facing so as to cover the core material, and a peripheral edge of the facing outer packaging material is sealed. And providing a vacuum heat insulating material having a crease line in at least one of the facing outer packaging materials.

  According to the present invention, the vacuum heat insulating material has a crease line portion on at least one of the facing outer packaging materials so as to cover the core material, and thus can be bent with the crease line portion as a trigger. It can be processed into a shape.

  In the said invention, it is preferable that the said outer packaging material which opposes has a crease line part, respectively. This is because the opposing outer packaging materials each have a crease line portion, whereby the vacuum heat insulating material can be bent in a desired direction at the crease line portion, and the flexibility is improved.

  In the case of the invention, one of the outer packaging materials has the crease line portion that forms a convex shape on the core material side, and the other outer packaging material has the crease line that forms a convex shape on the opposite side to the core material. It is preferable that the crease line part of one of the outer packaging materials and the crease line part of the other outer packaging material are in positions facing each other. This is because the vacuum heat insulating material of the present invention can be bent in both directions, and the workability can be further improved. Moreover, it is because the thickness of the core material of the part in which a crease line part is located can be ensured, and the fall of the heat insulation performance of a vacuum heat insulating material can be suppressed.

  In the present invention, the facing outer packaging material includes the crease line portion having a convex shape on the core material side and the crease line portion having a convex shape on the opposite side to the core material through a flat portion. It is preferable to have a pattern. This is because the vacuum heat insulating material of the present invention can be easily bent in a desired direction while maintaining the flatness as a whole, and the flexibility is improved.

  The present invention provides a crease line portion forming step for forming a crease line portion in an outer packaging material, and a sealing step for covering the core material using the outer packaging material on which the crease line portion is formed, and then depressurizing and sealing the inside. And providing a method for manufacturing a vacuum heat insulating material.

  According to the present invention, by using the outer packaging material in which the crease line portion is formed in advance, the crease line portion can be attached to the vacuum heat insulating material, and the crease line portion can be bent.

  The present invention is an outer packaging material for a vacuum heat insulating material used for a vacuum heat insulating material having a core material and an outer packaging material facing so as to cover the core material, and having a peripheral edge of the facing outer packaging material sealed. And the outer packaging material for vacuum heat insulating materials characterized by having a crease line part is provided.

  According to the present invention, by having the crease line portion, the vacuum heat insulating material formed using the outer packaging material for vacuum heat insulating material of the present invention can be bent with the crease line portion as a trigger.

  The present invention is a heat insulating article having an article having at least one of a curved surface portion and a corner portion, and a vacuum heat insulating material disposed on the article, wherein the vacuum heat insulating material covers the core material and the core material. Thus, the outer packaging material is opposed, the periphery of the opposed outer packaging material is sealed, and at least one of the opposed outer packaging materials has a crease line portion, and the vacuum heat insulating material is the Provided is a heat insulating article which is bent at a crease line and is disposed on at least one of the curved surface and the corner.

  According to the present invention, since the vacuum heat insulating material is bent at the crease line portion and disposed along the curved surface portion or corner portion of the article, a gap is generated between the curved surface portion or corner portion of the article and the vacuum heat insulating material. It becomes difficult and heat insulation performance of a heat insulation article can be maintained because heat leak from the space is controlled.

  In this invention, there exists an effect that the vacuum heat insulating material which can perform bending etc. easily in a crease line part can be provided.

It is the schematic perspective view and sectional drawing which show an example of the vacuum heat insulating material of this invention. It is explanatory drawing which shows the example of the cross-sectional shape of a crease line part. It is explanatory drawing which shows the example of the pattern in planar view of a crease line part. It is a schematic sectional drawing which shows the other example of the vacuum heat insulating material of this invention. It is a schematic sectional drawing which shows the other example of the vacuum heat insulating material of this invention. It is process drawing which shows an example of the manufacturing method of the vacuum heat insulating material of this invention. It is process drawing which shows the other example of the manufacturing method of the vacuum heat insulating material of this invention. It is process drawing which shows the other example of the manufacturing method of the vacuum heat insulating material of this invention. It is a schematic sectional drawing which shows an example of the outer packaging material for vacuum heat insulating materials of this invention. It is the schematic diagram and sectional drawing which show an example of the heat insulation article of this invention. It is the schematic diagram and sectional drawing which show the other example of the heat insulation article of this invention.

  Hereinafter, the vacuum heat insulating material of the present invention, the vacuum heat insulating material manufacturing method, the vacuum heat insulating outer packaging material, and the heat insulating article will be described.

A. Vacuum heat insulating material First, the vacuum heat insulating material of this invention is demonstrated. The vacuum heat insulating material of the present invention is a vacuum heat insulating material having a core material and an outer packaging material facing so as to cover the core material, and having a peripheral edge of the facing outer packaging material sealed. It has a crease line part in at least one of the outer packaging materials.

  The vacuum heat insulating material of this invention is demonstrated using figures. Fig.1 (a) is a schematic perspective view which shows an example of the vacuum heat insulating material of this invention, FIG.1 (b) is XX sectional drawing of Fig.1 (a). The vacuum heat insulating material 10 of the present invention is such that the periphery of opposing outer packaging materials 1a and 1b is sealed into a bag shape, and the core material 2 is contained, and the inside is decompressed to be in a vacuum state. And sealed. Among the outer packaging materials 1a and 1b facing each other through the core material 2, a crease line portion 3 having a convex shape on the core material 2 side is formed on the surface of the outer packaging material 1b. The part 3 can be bent. The sealed portion 4 at the periphery of the outer packaging materials 1 a and 1 b becomes the end portion 4 of the vacuum heat insulating material 10. In addition, among the surfaces of the vacuum heat insulating material of the present invention, the surface located in parallel with the sealing surface at the end may be referred to as a flat surface of the vacuum heat insulating material, and the surface on which the end is formed may be referred to as the side surface of the vacuum heat insulating material. .

  According to the present invention, since the vacuum heat insulating material has the crease line portion on at least one of the facing outer packaging materials so as to cover the core material, it becomes possible to bend the crease line portion as a trigger, and a desired It can be processed into a shape.

  Hereinafter, each structure of the vacuum heat insulating material of this invention is demonstrated.

1. Crease line part The crease line part in this invention is formed in at least one of the outer packaging material which opposes. The crease line portion is a portion that triggers when the vacuum heat insulating material of the present invention is bent.

The cross-sectional shape of the crease line portion may be a convex shape on the core material side of the vacuum heat insulating material, or a convex shape on the opposite side to the core material.
Here, the fact that the crease line portion has a convex shape on the core side means that the crease line portion forms a groove on the surface of the vacuum heat insulating material as shown in FIG. On the other hand, the fact that the crease line portion has a convex shape on the opposite side to the core means that the crease line portion protrudes from the surface of the vacuum heat insulating material as shown in FIG.
Further, in the cross-sectional shape, a bottom portion of a crease line portion forming a convex shape on the core material side (hereinafter sometimes referred to as a bottom portion of the crease line portion), or a crease line portion forming a convex shape on the opposite side to the core material. The top portion (hereinafter sometimes referred to as the top portion of the crease line portion) may have a corner shape or a curvature shape. Specifically, as illustrated in FIG. 2, a semicircle (FIG. 2A), a triangle (FIG. 2B), a quadrangle (FIG. 2C), a trapezoid, a polygon (FIG. 2 d)), semi-elliptical and the like.
Especially, in this invention, it is preferable that the bottom part or top part of a crease line part is a shape which has a curvature. This is because when the vacuum heat insulating material is bent, stress is applied to the corner portion and a pinhole may be generated.

  The shape of the crease line in plan view is not particularly limited, but is preferably a straight line for ease of bending.

The depth or height of the crease line portion may be a size that allows the vacuum heat insulating material to be bent at the crease line portion. Specifically, the depth or height of the crease line portion is preferably in the range of 0.5 mm to 2.0 mm, and more preferably in the range of 0.6 mm to 1.5 mm. When the depth or height of the crease line portion is larger than the above range, a pinhole or the like may occur during bending depending on the tensile strength of the outer packaging material. On the other hand, if it is smaller than the above range, the vacuum heat insulating material may not be bent at the crease line.
In addition, the depth or height of a crease line part means the length from the surface of a vacuum heat insulating material to the bottom part or top part of a crease line part.

  The line width of the crease line portion is not particularly limited, and can be appropriately set according to the size of the vacuum heat insulating material of the present invention.

  The number of the crease line portions is not particularly limited as long as it is one or more. Here, as the number of the crease line portions increases, the flexibility of the vacuum heat insulating material improves, so that the vacuum heat insulating material can follow and adhere to a complicated shape such as a curved surface portion or a corner portion. . Thereby, it becomes difficult to produce a space | gap between a vacuum heat insulating material and the site | part which arrange | positions the said vacuum heat insulating material, and since the heat leak from the said space | gap is suppressed, a high heat insulation performance can be exhibited. On the other hand, since the thickness of the vacuum heat insulating material is reduced at the crease line portion, the heat insulation performance as the whole vacuum heat insulating material may be lowered as the number of the crease line portions is increased. For the above reasons, it is preferable to have an optimum number designed based on the required flexibility and the correlation between the number of crease lines and the heat insulation performance.

  In the present invention, when a plurality of crease line portions are provided, the interval between adjacent crease line portions can be appropriately set according to the flexibility required for the vacuum heat insulating material, but is preferably large. When the arrangement interval of the crease line portions is small, the number of crease line portions can be increased and the flexibility of the vacuum heat insulating material is increased, while the overall thickness of the vacuum heat insulating material is reduced and the heat insulating performance is reduced. Because there is. The arrangement interval of the crease line portions is preferably larger than 1 mm, for example, and more preferably 3 mm or more.

In the present invention, in the case of having a plurality of crease line portions, as a pattern in plan view of the crease line portions (hereinafter sometimes referred to as a plane pattern), the flexibility required for the vacuum heat insulating material of the present invention is obtained. It can be designed accordingly. For example, as shown in FIG. 1 (a), a pattern in which the vacuum heat insulating material is arranged in one vertical or horizontal direction is exemplified, but the present invention is not limited to this. Other planar patterns include, for example, a diagonal pattern in one direction, a vertical and horizontal grid pattern as shown in FIG. 3A, a diagonal pattern as shown in FIG. Examples thereof include a triangular lattice pattern as shown in (c) and a concentric pattern as shown in FIG. Among these, it is preferable to have a lattice pattern. This is because the vacuum heat insulating material of the present invention can be bent in multiple directions, and the workability can be further improved.
FIG. 3 is an explanatory diagram showing an example of a pattern in plan view of the crease line portion.

In the present invention, when having a plurality of crease line parts, the cross-sectional pattern of the crease line part viewed from the side surface of the vacuum heat insulating material can be appropriately designed according to the flexibility required for the vacuum heat insulating material of the present invention. I can do it. For example, as shown in FIG. 1B, a pattern in which all the crease line portions 3 have a convex shape on the core material 2 side may be used, and all the crease line portions have a convex shape on the opposite side to the core material. It may be a pattern formed. Moreover, the pattern which the crease line part which forms convex shape on the core material side, and the crease line part which forms convex shape on the opposite side to the core material may be mixed alternately or at random.
In these patterns, it is preferable to place a flat portion along a surface formed by the entire outer packaging material between adjacent crease line portions. This is because the flatness of the entire vacuum heat insulating material of the present invention can be maintained. Among these, a pattern in which a crease line portion having a convex shape on the core material side and a crease line portion having a convex shape on the opposite side to the core material are alternately mixed via a flat portion is preferable.
Further, a bellows pattern in which a crease line portion having a convex shape on the core material side and a crease line portion having a convex shape on the opposite side to the core material are alternately continued without a flat portion may be used.

  In the present invention, the crease line portion only needs to be provided on at least one of the surfaces of the facing outer packaging material, but it is preferable that the facing outer packaging materials each have a crease line portion. This is because the vacuum heat insulating material of the present invention can be easily bent in a desired direction and the flexibility is improved.

  When the opposing outer packaging materials each have a crease line portion, for example, as shown in FIG. 4A, both the opposing outer packaging materials 1b are arranged with a plurality of crease line portions 3 forming a convex shape on the core material 2 side. As shown in FIG. 4B, a plurality of crease line portions 3 having a convex shape on the opposite side to the core material 2 are arranged as shown in FIG. 4B. It may have the same pattern. Further, as shown in FIG. 4C, one of the facing outer packaging materials 1 b has a crease line portion 3 A that forms a convex shape on the core material 2 side, and the other has a convex shape on the opposite side to the core material 2. It may have the crease line part 3B which comprises. Among them, one of the outer packaging materials has a crease line portion that forms a convex shape on the core material side, and the other outer packaging material has the crease line portion that forms a convex shape on the side opposite to the core material, It is preferable that the crease line portion of the outer wrapping material and the crease line portion of the other outer wrapping material are in positions facing each other. Furthermore, at this time, when the crease line portion of one of the outer packaging materials and the crease line portion of the other outer packaging material are opposed to each other, at least a part of them is viewed from the thickness direction of the entire outer packaging material. It is preferable to overlap. This is because the vacuum heat insulating material of the present invention can be bent in both directions, and the workability can be further improved. Moreover, it is because the thickness of the core material of the part in which a crease line part is located can be ensured, and the fall of the heat insulation performance of a vacuum heat insulating material can be suppressed.

Further, both of the facing outer packaging materials may have a pattern in which a crease line portion having a convex shape on the core material side and a crease line portion having a convex shape on the opposite side to the core material are mixed. At this time, as shown in FIG. 5, the opposing outer packaging material 1 b includes a crease line portion 3 A that has a convex shape on the core material 2 side and a crease line portion 3 B that has a convex shape on the opposite side to the core material 2. Although it may have a pattern mixed through the flat part S, although not shown, a crease line part forming a convex shape on the core material side and a crease line part forming a convex shape on the opposite side to the core material, You may have the bellows pattern which continues alternately without interposing a flat part.
In particular, in the present invention, it is preferable to have a pattern in which a crease line portion having a convex shape on the core material side and a crease line portion having a convex shape on the opposite side to the core material are mixed via a flat portion. This is because the vacuum heat insulating material of the present invention can be easily bent in a desired direction while maintaining the flatness as a whole, and the flexibility is improved.
Further, at this time, it is preferable that the crease line portion that forms a convex shape on the core material side in one outer packaging material and the crease line portion that forms a convex shape on the opposite side to the core material in the other outer packaging material. . The reason is the same as described above.
4 and 5 are schematic cross-sectional views showing other examples of the vacuum heat insulating material of the present invention.

  The crease line portion may be provided in at least a region in contact with the core material of the outer packaging material, but may be provided on an end portion of the vacuum heat insulating material. This is because the flexibility at the end of the vacuum heat insulating material of the present invention is also improved.

2. Outer packaging material The outer packaging material in the present invention is opposed so as to cover the core material, and the periphery of the opposed outer packaging material is sealed.

The outer packaging material in the present invention may be any material as long as it can cover the core material and has a gas barrier property, and a material in which a protective layer, a gas barrier layer, and a heat welding layer are laminated at least in this order is usually used.
Hereinafter, each member of the outer packaging material will be described.

(A) Thermal welding layer The said thermal welding layer is a site | part which contact | connects a core material in the vacuum heat insulating material of this invention. Moreover, it is a site | part which forms a sealing surface when sealing the periphery of the outer packaging material which opposes.

  The material of the heat-welding layer is preferably a thermoplastic resin because it can be melted and fused by heating. For example, a polyolefin resin such as polyethylene or unstretched polypropylene (CPP), a polyvinyl acetate resin , Polyvinyl chloride resin, poly (meth) acrylic resin, urethane resin and the like.

  In addition to the above-described resin, other materials such as an anti-blocking agent, a lubricant, a flame retardant, and an organic filler may be included.

  As melting | fusing point of the said heat welding layer, it is preferable to exist in the range of 80 to 300 degreeC, for example, and it is preferable to exist in the range of 100 to 250 degreeC especially. By setting the melting point of the heat-welded layer within the above range, peeling of the sealing surface of the outer packaging material can be suppressed under the usage environment of the vacuum heat insulating material of the present invention.

  The thickness of the heat welding layer is preferably, for example, in the range of 20 μm to 100 μm, more preferably in the range of 25 μm to 90 μm, and particularly preferably in the range of 30 μm to 80 μm. When the thickness of the heat-welded layer is larger than the above range, the gas barrier property of the outer packaging material may be lowered. On the other hand, when the thickness is smaller than the above range, the adhesive force may not be obtained.

(B) Gas barrier layer The said gas barrier layer is a site | part normally formed between a heat welding layer and a protective layer.

  Examples of the gas barrier layer include a metal foil such as aluminum, nickel, stainless steel, iron, copper, and titanium, a vapor deposition film in which an inorganic substance such as a metal, metal oxide, and silicon oxide is vapor-deposited on one side of the resin film, and polyvinyl on the vapor deposition film. Those generally used as a gas barrier layer such as those provided with a gas barrier coating film of a gas barrier composition containing at least one of an alcohol-based resin and an ethylene vinyl alcohol copolymer can also be used.

The gas barrier layer may be a single layer or a multilayer body in which layers made of the same material or layers made of different materials are laminated.
The gas barrier layer may be subjected to a surface treatment such as a corona discharge treatment from the viewpoint that the gas barrier performance and the adhesion with other layers can be improved.

  The thickness of the gas barrier layer is, for example, preferably in the range of 2 μm to 50 μm, and more preferably in the range of 5 μm to 12 μm. If the thickness of the gas barrier layer is smaller than the above range, pinholes and the like are likely to occur when forming the crease line portion, and the gas barrier property may be deteriorated. This is because heat bridge is likely to occur in the vacuum heat insulating material, and the heat insulating performance may be deteriorated.

As the gas barrier properties of the gas barrier layer is preferably an oxygen permeability is not more than ^0.5cc · m -2 · ^{day -1,} is preferably Among them ^0.1cc · m -2 · ^{day -1} or less. It is preferable that water vapor permeability is not more than ^0.2cc · m -2 · ^{day -1,} is preferably Among them ^0.1cc · m -2 · ^{day -1} or less. When the oxygen and water vapor permeability of the gas barrier layer is within the above-described range, it is possible to make it difficult for moisture, gas, and the like that have permeated from the outside to penetrate into the inner core material.
The oxygen permeability is based on JIS-K-7126B using an oxygen permeability measuring device (Oxtran manufactured by MOCON, USA) under the conditions of a temperature of 23 ° C. and a humidity of 90% RH. It is a measured value. The water vapor permeability is a value measured using a water vapor permeability measuring device (manufactured by MOCON, USA, PERMATRAN) under the conditions of a temperature of 40 ° C. and a humidity of 90% RH.

(C) Protective layer The said protective layer is a site | part used as the outermost layer (outermost layer) in the vacuum heat insulating material of this invention. The protective layer preferably has sufficient strength to protect the inside of the vacuum heat insulating material of the present invention, and is excellent in heat resistance, moisture resistance, pinhole resistance, puncture resistance, and the like.

  The protective layer only needs to use a resin having a melting point higher than that of the heat welding layer, and may be in the form of a sheet or film. Examples of such a protective layer include sheets or films of nylon resin, polyester resin, polyamide resin, polypropylene resin, and the like.

The protective layer may be a single layer, or may be a multilayer formed by laminating layers made of the same material or layers made of different materials.
The protective layer may be subjected to a surface treatment such as a corona discharge treatment from the viewpoint of improving the adhesion with other layers.

  The thickness of the protective layer is not particularly limited as long as it can protect the heat welding layer and the gas barrier layer, but is generally about 5 μm to 80 μm.

(D) Outer packaging material Each layer constituting the outer packaging material may be directly contacted and laminated, or may be laminated via an interlayer adhesive. About an interlayer adhesive agent, the adhesive agent generally used for the outer packaging material for vacuum heat insulating materials can be used.

The outer packaging material may have a plurality of protective layers or gas barrier layers. For example, two or more gas barrier layers may be provided between the heat welding layer and the protective layer, and two or more protective layers may be provided on the heat welding layer and the gas barrier layer. Further, another protective layer may be provided between the heat welding layer and the gas barrier layer.
The outer packaging material may have an arbitrary layer such as an anchor coat layer or a pinhole-resistant layer.

  The film thickness of the outer packaging material is not particularly limited, but may be any thickness as long as the crease line portion can be formed by a method described later and has a desired gas barrier property, for example, 30 μm to 200 μm. It is preferable to be within the range of 50 μm to 150 μm.

  The tensile strength of the outer packaging material is preferably 50N or more, and more preferably 80N or more. This is because breakage or the like hardly occurs when the vacuum heat insulating material of the present invention is bent. The tensile strength is a value measured based on JIS-Z-1707.

  The method for laminating the outer packaging material is not particularly limited as long as it is a method that can laminate each layer so that one outermost layer has a protective layer and the other outermost layer has a heat-welded layer, A known laminating method such as a dry lamination method or an extrusion method can be used.

3. Core material The core material in this invention is covered with the said outer packaging material, and is included in an outer packaging material. In this invention, it is preferable that the core material is arrange | positioned in the position which opposes the crease line part of an outer packaging material inside a vacuum heat insulating material. This is because, when the vacuum heat insulating material of the present invention is bent at the crease line portion, it is possible to prevent the heat insulating performance from being lowered due to the reduced thickness of the vacuum heat insulating material.

In the present invention, the core material is preferably plate-shaped. The said core material is plate-shaped in the inside of the vacuum heat insulating material of this invention that the main material of the core material mentioned later is continuing in the surface along the width | variety (plane) direction of a vacuum heat insulating material. Say. By using a plate-shaped core material, the core material can be easily disposed at a position facing the crease line portion of the vacuum heat insulating material. And in this invention, since an outer packaging material has a crease line part, even if it is a case where a plate-shaped core material is used, it becomes possible to bend a vacuum heat insulating material.
In addition, in the inside of the vacuum heat insulating material of the present invention, the core material does not need to be completely connected over the entire surface along the width (plane) direction of the vacuum heat insulating material, and there are some cut portions. May be. In addition, the location cut | disconnected means the location isolate | separated naturally even if it does not pull. However, the core material is preferably not more than 100 separations, more preferably not more than 10 separations, from the viewpoint of avoiding disposing as much as possible a portion that is cut at a position facing the crease line portion of the vacuum heat insulating material. preferable.
As the plate-like core material, for example, a molded body obtained by molding a main material of a core material described later into a plate shape, or a dense material in which a main material of a core material described later is connected in a plate shape by external pressure inside a vacuum heat insulating material. A collection etc. are mentioned.

As a main material of a core material, the material generally used as a core material of a vacuum heat insulating material can be used. For example, powders such as silica, pearlite, clay, talc, foams such as urethane foam, styrene foam, phenol foam, fiber bodies such as glass fiber, alumina fiber, silica alumina fiber, silica fiber, ceramic fiber, rock wool, etc. Can be mentioned. It is preferable that the main material of these core materials is itself porous.
These main materials may be used alone or as a mixture of two or more materials.

Further, the core material may contain a getter agent in order to prevent a decrease in the degree of vacuum over time due to a minute amount of moisture or gas that permeates from the outside. In particular, in order to prevent a decrease in heat insulation performance, it is preferable that only the core material and the getter agent are included in the outer packaging material.
As the getter agent, it can be a material conventionally used for vacuum heat insulating materials, for example, dosonite, hydrotalcite, metal hydroxide, molecular sieves, silica gel, calcium oxide, zeolite, hydrophobic zeolite, activated carbon, etc. Can be mentioned.

  The core material preferably has a low thermal conductivity. Among them, a porous material having a core material porosity of 50% or more, particularly 90% or more is preferable.

  The thickness of the core material may be any thickness that can be bent at the crease line portion, and is appropriately set according to the composition and strength of the outer packaging material. The core material can be thickened as the strength of the outer packaging material increases. The thickness of the core material after decompression is preferably in the range of 1 mm to 10 mm.

4). Vacuum heat insulating material In the present invention, it is preferable that the outer packaging material and the core material are in direct contact with each other. If there is another member between the outer packaging material and the core material, there is a risk that the heat insulation property of the vacuum heat insulating material will decrease due to the decrease in the porosity inside the vacuum heat insulating material or the heat bridge. This is because there is a possibility of inhibiting the flexibility. Therefore, in the present invention, a member that contributes to flexibility is usually unnecessary inside the vacuum heat insulating material.
Here, the member that contributes to the flexibility is, for example, a metal such as aluminum, iron, SUS, or the like, or an organic resin, and has plastic deformability, such as a corrugated plate shape, a pleated shape, and a bellows shape. An aggregate having a shape. In the present invention, since the outer wrapping material has a crease line portion, it has an advantage that it is possible to impart flexibility to the vacuum heat insulating material without having a member that contributes to flexibility inside the vacuum heat insulating material. .

  Moreover, in the vacuum heat insulating material of the present invention, the core material may or may not follow the shape of the crease line portion of the outer packaging material, but preferably follows. This is because the core material follows the shape of the crease line portion, whereby the vacuum heat insulating material is further easily bent at the crease line portion. At this time, it is particularly preferable that the core material follows the shape of the crease line portion without any gap. This is because if there is a space between the core material and the crease line portion, heat transfer due to air convection may occur when the degree of vacuum in the space decreases.

  The vacuum heat insulating material of the present invention is one in which the inside is depressurized and sealed, and specifically, the degree of vacuum inside is preferably 5 Pa or less. By setting the degree of vacuum inside the vacuum heat insulating material within the above range, heat conduction due to convection of air remaining inside can be reduced, and excellent heat insulation can be exhibited.

The thermal conductivity of the vacuum heat insulating material of the present invention is low it is preferable, for example, preferably a thermal conductivity at 25 ° C. (initial thermal conductivity) is less than 15mW ^· m ^-1 · K -1, inter alia It is preferably 10 mW · m ⁻¹ · K ⁻¹ or less, and particularly preferably 5 mW · m ⁻¹ · K ⁻¹ or less. This is because, by setting the thermal conductivity of the vacuum heat insulating material within the above range, the vacuum heat insulating material is less likely to conduct heat to the outside, so that a high heat insulating effect can be achieved. In addition, the said heat conductivity is the value measured by the heat flow meter method using the heat conductivity measuring apparatus auto-lambda (made by HC-074 Hidehiro Seiki) according to JIS-A-1412-3.

  The vacuum heat insulating material of the present invention preferably has a high gas barrier property. This is because it is possible to prevent a decrease in the degree of vacuum due to penetration of moisture, oxygen, etc. from the outside. Since the gas barrier property of the vacuum heat insulating material is the same as the gas barrier property described in the above-mentioned section “2. Outer packaging material”, description thereof is omitted here.

5. Manufacturing method As a manufacturing method of the vacuum heat insulating material of this invention, the method of covering a core material using the outer packaging material which attached the crease line beforehand, sealing the periphery of an outer packaging material, and sealing under reduced pressure is preferable. This is because the core material can follow the shape of the crease line portion of the outer packaging material when sealing under reduced pressure.
In addition, the manufacturing method of the vacuum heat insulating material of this invention is demonstrated in the term of the "B. manufacturing method of a vacuum heat insulating material" mentioned later.

6). Use The vacuum heat insulating material of this invention has a heat-source part or a heat retaining part, and can be used for articles | goods, such as an apparatus and a house where heat insulation is calculated | required. Note that the “heat source section” refers to a portion that generates heat in the device main body or inside the device when the device itself is driven, and refers to, for example, a power source or a motor. The “insulated part” refers to a part that does not have a heat source part in the apparatus main body or inside, but the apparatus is heated by receiving heat from an external heat source.
As an article having a heat source part or a heated part and requiring heat insulation, for example, a natural refrigerant heat pump water heater (registered trademark “Ecocute”), a refrigerator, a rice cooker, a pot, a microwave oven, a commercial oven, an IH cooking heater, Electric appliances such as OA equipment, vending machines, hot water storage tanks, heat insulation tanks, piping in piping facilities, automobiles, and the like. The article preferably has at least one of a curved surface portion and a corner portion.

B. Next, the manufacturing method of the vacuum heat insulating material of this invention is demonstrated. The method for manufacturing a vacuum heat insulating material according to the present invention includes a crease line portion forming step for forming a crease line portion in an outer packaging material, and the core material is covered with the outer packaging material on which the crease line portion is formed, and then the inside is covered. And a sealing step of reducing pressure and sealing.

The manufacturing method of the vacuum heat insulating material of the present invention will be described with reference to the drawings. FIG. 6 is a process diagram showing an example of a method for producing a vacuum heat insulating material according to the present invention. In addition, illustration about each layer structure of an outer packaging material is abbreviate | omitted in FIG.6 (b)-(d).
First, an outer packaging material 1a in which at least a protective layer 11, a gas barrier layer 12, and a heat welding layer 13 are laminated is prepared (FIG. 6A).
Next, an embossing plate cylinder 51a having convex portions on the surface as transfer plates, and an embossing impression cylinder 51b having concave portions that have a male-female relationship with the convex portions and can be engaged with each other, are arranged in a row. Transport in the direction. The outer wrapping material 1a is pressed while rotating the embossing plate cylinder 51a in the R1 direction and the embossing pressure drum 51b in the R2 direction to form the crease line portion 3 (FIG. 6B), and the obtained outer packaging material 1b is desired. Cut with the length of.
Subsequently, the outer packaging material 1b having the crease line portion 3 and the outer packaging material 1a not having the crease line portion are overlapped so that the heat-welded layer is on the inner side, and the edges other than the one side that becomes the opening are sealed. Then, it is made into a bag shape, and the core material 2 is put and covered therein, and the inside is sealed and sealed while reducing the pressure Y (FIG. 6C). Thereby, the vacuum heat insulating material 10 which has the crease line part 3 in one of the opposing outer packaging materials can be manufactured (FIG.6 (d)). 6B is a crease line forming process, and FIGS. 6C to 6D are sealing processes.

  According to the present invention, a vacuum heat insulating material can be manufactured without using a hydraulic roller, a die press, or the like, by manufacturing a vacuum heat insulating material using an outer packaging material in which a crease line portion is formed in advance. A crease line part can be attached to. Thereby, the vacuum heat insulating material which can be bent in the said crease line part can be obtained.

  Hereinafter, the manufacturing method of the vacuum heat insulating material of this invention is demonstrated for every process.

1. Crease line forming step The crease line forming step in the present invention is a step of forming a crease line portion in the outer packaging material.

(1) Outer packaging material First, the outer packaging material used in this step will be described. The outer packaging material may be any material that can cover the core material and has gas barrier properties. Usually, a material in which a protective layer, a gas barrier layer, and a heat welding layer are laminated in at least this order is used.
About each layer of the said outer packaging material, since it can be set to be the same as that of each layer of the outer packaging material demonstrated in the term of "A. vacuum heat insulating material", description here is abbreviate | omitted.

(2) Formation method of crease line part Next, the method of forming a crease line part in an outer packaging material in this process is demonstrated.
The method for forming the crease line portion on the outer packaging material is not particularly limited as long as it can be formed so that the crease line portion has a desired shape, pattern, or the like.
As such a method, for example, a first aspect in which an outer packaging material is pressed with a transfer plate having a concavo-convex shape for transferring a crease line portion on the surface (hereinafter sometimes referred to as an embossed plate), an outer packaging material There are two modes of the second mode of pressing in a state of being temporarily folded into a concavo-convex shape.
Hereinafter, the method of forming the crease line portion will be described separately for each aspect.

(A) 1st aspect This aspect is the method of pressing an outer packaging material with the transfer plate which has uneven | corrugated shape on the surface. Specifically, a method of transferring and forming a crease line portion by pressing an outer packaging material between an embossed plate cylinder and an embossed impression cylinder, a transfer plate having convex portions on a lower plate and an upper plate of a lithographic press, and a concave portion Examples thereof include a method in which a transfer plate is provided and a crease line portion is transferred and formed by pressing the outer packaging material between the upper plate and the lower plate from above and below. The embossing impression cylinder and the embossing plate cylinder may be referred to as an embossing roll.
In this aspect, the crease line portion can be formed by transferring the shape of the convex portion of the transfer plate to the outer packaging material.

  The method of using the embossing roll as the transfer plate is the same as that described with reference to FIG. In the method using an embossing roll as the transfer plate, the transfer plate can be pressed while moving the outer packaging material, so that it becomes easy to continuously form the crease line portion.

As a method of using a lithographic press provided with a transfer plate, for example, as illustrated in FIG. 7, first, a cylindrical shape having two end portions 4 a by overlapping two outer packaging materials 1 a and adhering two opposite sides. And Next, a transfer plate 52a having convex portions is arranged on the lower plate of the lithographic press 53, and a transfer plate 52b having concave portions meshing with the convex portions of the transfer plate 52a is arranged on the upper plate, and the upper and lower sides are passed through the outer packaging material 1a. Press P. Thereby, the shape of the convex part of the transcription | transfer plate 52a is transcribe | transferred to the outer packaging material 1a, and a crease line part can be formed. In the method using a lithographic press provided with a transfer plate, the outer packaging material can be stopped and the transfer plate can be pressed. Therefore, it is easy to prevent a crease line portion from being formed at the bonded portion of the outer packaging material. Thereby, in the obtained vacuum heat insulating material, it is possible to make it difficult for outside air to enter from the sealed end.
In addition, in FIG. 7, illustration about the layer structure of an outer packaging material is abbreviate | omitted.

(I) Transfer Plate The transfer plate used in this embodiment has a concavo-convex shape on the surface. The shape of the crease line is formed by the convex portion of the transfer plate.
The transfer plate may be a roll or a lithographic plate.

  The material of the transfer plate is not particularly limited as long as a desired uneven shape can be formed and a crease line portion having a clear outline can be formed on the outer packaging material by pressing. For example, a metal, a ceramic, resin, etc. are mentioned.

The shape of the convex portion of the transfer plate is not particularly limited as long as it can form a crease line portion having a desired shape, and examples thereof include a shape in which the top portion of the convex portion has a corner and a shape having a curvature. Specifically, since the cross-sectional shape of the convex portion can be the same as the cross-sectional shape of the crease line portion described in the section “A. Vacuum heat insulating material”, description thereof is omitted here.
In the present invention, it is preferable that the top of the convex portion of the transfer plate has a curvature. This is because when the top of the convex portion has a corner, when the crease line portion is formed by pressing the transfer plate against the outer packaging material, stress may be applied to the corner and a pinhole may occur in the outer packaging material.
Further, the pattern of the transfer plate in plan view can be appropriately designed according to the flexibility required for the intended vacuum heat insulating material. The pattern in plan view of the transfer plate can be the same as the pattern in plan view of the crease line portion described in the section “A. Vacuum heat insulating material”.

The height of the convex portion of the transfer plate may be a height that can form a crease line in the outer packaging material by pressing, but if it is too high, a pinhole or the like may occur in the outer packaging material when pressed. Therefore, it is preferable to set appropriately according to the thickness of the gas barrier layer of the outer packaging material, the tensile strength of the outer packaging material, and the like.
For example, when the thickness of the gas barrier layer and the tensile strength of the outer packaging material are within the range described in the section “A. Vacuum heat insulating material”, the height of the convex portion of the transfer plate is greater than 1 mm and less than 3 mm. It is preferable that it is about 2 mm among them. If the height of the convex portion of the transfer plate is larger than the above range, pinholes may occur when forming the crease line portion in the outer packaging material, while if smaller than the above range, the crease line is formed in the outer packaging material. The part may be difficult to form.
The height of the convex portion of the transfer plate refers to the length from the surface of the transfer plate to the highest vertex of the convex portion.

The pitch width of the convex portions of the transfer plate can be appropriately set according to the use of the obtained vacuum heat insulating material, required flexibility, etc., but is preferably large. This is because if the pitch width of the convex portions is too small, a large number of crease line portions can be provided, while the overall thickness of the obtained vacuum heat insulating material becomes small and the heat insulating performance may be lowered. In addition, since the pitch width is too small, it may be difficult to form a crease line portion having a clear outline according to this aspect.
The pitch width is the same as the arrangement interval of the crease line portions described in the section “A. Vacuum heat insulating material”, and thus the description thereof is omitted here.

(Ii) Pressing conditions The pressing force when pressing the transfer plate against the outer packaging material is not particularly limited as long as the outer packaging material can follow the convex portion of the transfer plate, and the material and thickness of the outer packaging material to be used The thickness can be appropriately set according to the tensile strength, the height of the convex portion of the transfer plate, and the like.
A larger pressing force is preferable from the viewpoint that a crease line portion having a clear outline can be formed on the outer packaging material. However, if the pressing force is too large, pinholes, cracks, etc. may occur in the outer packaging material. It is preferable to be within the range of cm ^{2 to} 80 kgf / cm ² .
Specifically, when pressing with a transfer plate having a convex portion height in the range of 2 mm to 3 mm against an outer packaging material having a nylon protective layer having a film thickness in the range of 10 μm to 30 μm, The pressing force is preferably in the range of 40 kgf / cm ^{2 to} 80 kgf / cm ² .
In addition, about pressing time, it sets suitably according to the outer packaging material to be used, pressing force, etc.

In this aspect, the crease line portion may be formed on one outer packaging material, or the crease line portion may be formed on the outer packaging material in a state where two or more sheets are overlapped. Especially, it is preferable to form a crease line part in the outer packaging material in a state where two or more sheets are stacked. This is because the same shape and number of crease lines can be collectively formed in the same pattern by pressing the transfer plate against the outer packaging material in a state where two or more sheets are stacked.
In addition, when forming the crease line portion on the outer packaging material in a state where two or more sheets are stacked, the number of sheets that can be stacked is the crease line portion having a desired height or depth on each outer packaging material by pressing the transfer plate. Any number of sheets can be formed, and the number is appropriately set according to the thickness of the crease line portion per sheet, pressing conditions, and the like.

  In this embodiment, the crease line portion may be formed after adhering at least one side of the overwrapped outer packaging material. Adhering at least one side of the overlapped outer packaging material usually means stacking two outer packaging materials and adhering at least one side of the peripheral edges. This is because this method can prevent misalignment when forming the crease line portion. Further, when covering the core material with the outer packaging material obtained by this method, it becomes easier to insert the core material along the bonded one side, the crease line portion disposed on one outer packaging material, and the other outer packaging material This is because it is possible to face the crease line portion disposed on the substrate with the core material interposed therebetween. In the method using an embossing roll as the transfer plate, it is preferable to bond at least one side along the direction in which the outer packaging material advances.

  In particular, it is more preferable to form the crease line part after adhering two or more sides that are opposite and / or continuous of the outer packaging material in an overlapped state. By adhering two or more continuous sides of the outer packaging material, the outer packaging material becomes a bag shape, and an inner corner of the bag is formed. Further, the outer packaging material can be formed into a cylindrical shape by adhering at least two opposing sides of the outer packaging material. This is because by making the outer packaging material cylindrical or bag-like, the core material can be easily inserted and the core material can be easily sealed. In the method using an embossing roll as the transfer plate, it is preferable to bond two opposing sides along the direction in which the outer packaging material advances.

  Moreover, in this aspect, you may form a crease line part in the said outer packaging material of the folded state. The state in which the outer packaging material is folded usually means a state in which the outer packaging material is folded in two so that opposing sides of one outer packaging material overlap each other. According to this method, one side is connected by folding the outer packaging material, there is no need to separately adhere at least one side of the outer packaging material, and the crease line portion is formed in a state where the outer packaging material is folded, The misalignment of the crease line can be prevented.

  Note that the crease line portion may be formed by stacking a plurality of outer packaging materials in which at least one side is bonded or folded and pressing the transfer plate.

In this aspect, since the transfer plate can be continuously pressed onto the outer packaging material, a plurality of outer packaging materials can be obtained by cutting into desired dimensions after pressing.
In addition, by winding up the outer packaging material in which at least one side is bonded or folded, and pressing the transfer plate while unwinding the outer packaging material, the crease line portion can be formed continuously, Further, it is possible to produce a cylindrical or bag-shaped outer packaging material by cutting and heat-welding at a desired position.

(B) Second Aspect This aspect is a method of pressing an outer packaging material in a state of being temporarily folded into an uneven shape. Specifically, as illustrated in FIG. 8, the outer packaging material 1 a is preliminarily folded into a desired pattern and sandwiched between the lithographic press 53, and by pressing P from above and below, the temporarily folded portion is defined as a crease line portion. It is a method to do. This method does not require a transfer plate.
In addition, in FIG. 8, illustration is abbreviate | omitted about the layer structure of an outer packaging material.

In this aspect, one outer packaging material may be temporarily folded, or two or more outer packaging materials may be stacked and temporarily folded.
Moreover, at least one side of the outer packaging material to be temporarily folded may be sealed. Since these reasons are the same as those described in the above-mentioned section “(a) First aspect”, description thereof is omitted here.

  In addition, about the press conditions in this aspect, it can set suitably according to the thickness, tensile strength, number of sheets, etc. of the outer packaging material to be used.

(3) Crease line part FIG. 9: is a schematic sectional drawing which shows the example of the outer packaging material in which the crease line part was formed by this process. As a cross-sectional pattern of the crease line portion formed in this step, for example, as shown in FIG. 9 (a) or (b), all the crease line portions 3 are thermally welded layers from the protective layer 11 side of the outer packaging material 1b. A pattern having a convex shape toward the 13 side, or a pattern having a convex shape from the heat welding layer 13 side to the protective layer 11 side, as shown in FIG. 9C, the protective layer 11 from the heat welding layer 13 side. Examples thereof include a pattern in which a crease line portion 3A having a convex shape toward the side and a crease line portion 3B having a convex shape from the protective layer 11 side toward the heat welding layer 13 side are mixed. In these patterns, the flatness as a whole of the obtained vacuum heat insulating material can be maintained by passing the flat portion S along the surface formed by the entire outer packaging material between the adjacent crease line portions. Moreover, the pattern in which the crease line portions 3A and 3B are mixed as shown in FIG. 9C is preferable in that the obtained vacuum heat insulating material can be bent in both directions, and the workability can be further improved. .
Furthermore, as shown in FIG. 9 (d), the crease line portion 3A forming a convex shape from the heat welding layer 13 side toward the protective layer 11 side and the convex shape from the protective layer 11 side toward the heat welding layer 13 side. The crease line portion 3B formed may be a bellows pattern in which the crease line portion 3B is alternately and continuously repeated without a flat surface.
Note that reference numerals not described in FIG. 9 are the same as those in FIG.

  The details of the crease line portion formed in this step are the same as the details of the crease line portion described in the section “A. Vacuum heat insulating material”, and thus the description thereof is omitted here.

2. Sealing Step The sealing step in the present invention is a step of covering the core material using the outer packaging material on which the crease line portion is formed, and then reducing the pressure inside to seal it.

(1) Core material About the core material used in this process, it can be made to be the same as that of the content demonstrated by the term of "A. Vacuum heat insulating material 3. Core material."
In this step, the main material of the core material such as powder or fiber body may be used as it is, or a molded body obtained by molding the main material of the core material into a plate shape having a thickness described later may be used. .

  The thickness of the core material is preferably a size that can be bent at the crease line after decompression, and is appropriately set depending on the strength of the outer packaging material. For example, when the tensile strength of the outer packaging material is in the range described in the section “A. Vacuum heat insulating material”, the thickness of the core material (before decompression) is in the range of 1 mm to 50 mm, especially in the range of 3 mm to 40 mm. In particular, the range of 5 mm to 30 mm is preferable.

(2) Sealing method With respect to the method of covering the core material with the outer packaging material, the outer packaging material is opposed so as to cover the core material, and the crease line portion is disposed on at least one of the opposed outer packaging materials. It is not limited. For example, the outer packaging material is overlapped so that the heat-welded layers face each other on the inside, and the outer periphery is sealed except for one side that becomes an opening to form a bag, and the core material is inserted therein to decompress the inside. Method of sealing, placing the outer packaging material on the two opposite faces of the core material so that the heat-welded layer is on the inside, sealing the outer packaging material so that part of the periphery is open, and then reducing the inside Then, a sealing method or the like can be used. In these methods, the crease line portion can be arranged when the core material is covered, by using at least one of the opposing outer wrapping materials as the wrapping material on which the crease line portion is formed.

The outer packaging material that covers the core material only needs to have the crease line portion disposed on at least one of the outer packaging materials facing each other through the core material, but it is preferable that the crease line portion is disposed on both of the opposed outer packaging materials. At this time, the crease line portions of the facing outer packaging material may have the same or different numbers, shapes, patterns, etc., but are preferably the same.
Further, when the crease line portion is disposed on both of the facing outer packaging materials, the crease line portion in one outer packaging material and the crease line portion in the other outer packaging material are opposed to each other, so that they are the thickness of the entire outer packaging material. It is preferable that at least a part overlap when viewed from the direction. This is because bending of the obtained vacuum heat insulating material becomes easy. Moreover, when covering the core material and sealing under reduced pressure, it is possible to secure the thickness of the core material at the portion where the crease line portion is located, and to suppress the deterioration of the heat insulating performance of the obtained vacuum heat insulating material. .

The forming method when the outer packaging material is formed into a bag shape is not particularly limited. For example, the outer packaging material in which the crease line portion is formed is folded and overlapped, and the rim line portion except the one side that becomes the opening is bonded, For example, a method in which the outer packaging material formed with the wrapping material and the outer packaging material without the crease line portion are overlapped and the peripheral edge excluding one side serving as the opening is bonded can be used.
Further, in the crease line portion forming step, a method of forming a crease line portion by stacking the outer packaging material and bonding at least one side, and bonding the remaining peripheral edge excluding the one side that becomes the opening can be used.

  The heating temperature at the time of adhering the periphery of the outer packaging material is appropriately selected depending on the composition of the thermal welding layer of the outer packaging material and is usually higher than the melting point of the resin used for the thermal welding layer and lower than the decomposition temperature. It is preferable to set within the temperature range.

  The width of the sealing surface at the periphery of the outer packaging material, that is, the width of the end of the vacuum heat insulating material in the present invention is not particularly limited, but is preferably small enough not to cause peeling. This is because the end portion does not have a heat insulating function, so that if the width of the end portion is too large, the effective area contributing to heat insulation is reduced with respect to the entire area of the vacuum heat insulating material.

When covering the core material with the outer packaging material in this step, the main material of the powder or fibrous core material may be directly inserted into the outer packaging material in a bag shape, and the main material of the core material is plate-shaped. You may insert the molded object which shape | molded. Moreover, you may cover with the outer packaging material according to the shape of the core material which is a molded object.
When a molded body is used as the core material, the number of the molded bodies covered by a pair of opposed outer packaging materials may be one or plural, but preferably one.

  In this step, the method for reducing the pressure and sealing the inside of which the core material is covered with the outer packaging material is not particularly limited as long as the inside can be sealed with a desired degree of vacuum. For example, a method of inserting into a vacuum chamber in a state where a core material is put in a bag-like outer packaging material, degassing from the opening and reducing the pressure, and then heat-sealing and sealing the opening can be used.

  In this step, the core material may or may not follow the crease line portion of the outer packaging material during decompression, but preferably follows. Especially, it is preferable to make a core material follow the shape of a crease line part without gap. The reason is the same as the reason described in the section “A. Vacuum heat insulating material”.

  The size of the reduced pressure is not particularly limited as long as the inside can have a desired degree of vacuum, but it is preferable that the core can follow the pattern of the crease line portion of the outer packaging material. . Specifically, it is preferable to reduce the pressure so that the internal pressure is 5 Pa or less.

3. Other Steps The present invention may have arbitrary steps in addition to the steps described above. As optional steps, an outer packaging material preparing step for forming an outer packaging material in which a protective layer, a gas barrier layer, and a heat welding layer are laminated in this order, a core material preparing step using the core material as a molded body, an outer packaging material and a core material The drying process etc. which dry is mentioned.

C. Next, the outer packaging material for vacuum heat insulating material of the present invention will be described. The outer packaging material for a vacuum heat insulating material according to the present invention is used for a vacuum heat insulating material having a core material and an outer packaging material facing so as to cover the core material, and the periphery of the facing outer packaging material is sealed. It is an outer packaging material for a vacuum heat insulating material and has a crease line portion.

  Since the outer packaging material for a vacuum heat insulating material of the present invention is the same as the outer packaging material 1b described in FIG. 9, the description thereof is omitted here. The outer packaging material for vacuum heat insulation of the present invention is usually formed by laminating a protective layer, a gas barrier layer, and a heat welding layer in at least this order.

  According to the present invention, by having the crease line portion, the vacuum heat insulating material formed using the outer packaging material for vacuum heat insulating material of the present invention can be bent with the crease line portion as a trigger.

  The details of the outer packaging material for a vacuum heat insulating material and the bent portion of the present invention are the same as the details of the outer packaging material and the bent portion described in the sections “A. Vacuum heat insulating material” and “B. Manufacturing method of vacuum heat insulating material”. Therefore, the description here is omitted.

D. Thermal insulation article Next, the thermal insulation article of the present invention will be described. The heat insulating article of the present invention is a heat insulating article having an article having at least one of a curved surface portion and a corner portion, and a vacuum heat insulating material disposed on the article, wherein the vacuum heat insulating material is a plate-shaped core material. The outer packaging material facing so as to cover the core material, the peripheral edge of the facing outer packaging material is sealed, and at least one of the opposed outer packaging materials has a crease line portion, The vacuum heat insulating material is bent at the crease line portion and disposed at at least one of the curved surface portion and the corner portion.

The heat insulating article of the present invention will be described with reference to the drawings. Fig.10 (a) is a schematic diagram which shows an example of the heat insulation article of this invention, FIG.10 (b) is XX sectional drawing of Fig.10 (a). FIGS. 10A and 10B show an example of a hot water storage tank of a water heater as an article having a curved surface portion.
20 A of heat insulation articles | goods of this invention arrange | position the vacuum heat insulating material 10 in 21 A of articles | goods (hot water storage tank) which have a curved-surface part. Here, since the vacuum heat insulating material 10 has the crease line portion 3, it is bent at the crease line portion 3 and arranged so as to follow the curved surface portion of the hot water storage tank 21A.

Fig.11 (a) is a schematic diagram which shows the other example of the heat insulation article of this invention, FIG.11 (b) is the sectional side view seen from the X direction of Fig.11 (a). In addition, FIG. 11 (a), (b) shows the example of a refrigerator as an article | item which has a corner | angular part.
The heat insulation article 20B of the present invention is obtained by arranging the vacuum heat insulating material 10 on an article (refrigerator) 21B having a corner C. In the example illustrated in FIG. 11, the refrigerator 21 </ b> B includes an outer box 22, an inner box 23, and a door 24, and the vacuum heat insulating material 10 is disposed in a space between the outer box 22 and the inner box 23. Here, since the vacuum heat insulating material 10 has the crease line portion 3, the vacuum heat insulating material 10 is arranged to be bent at the crease line portion 3 and follow the corner portion C.

  In addition, in this invention, the edge part of a vacuum heat insulating material is normally arrange | positioned in the state bent along the side surface and plane of a vacuum heat insulating material. 10 and 11, the illustration of the layer configuration and end portions of the vacuum heat insulating material is omitted.

  According to the present invention, since the vacuum heat insulating material is bent at the crease line portion and disposed along the curved surface portion or corner portion of the article, a gap is generated between the curved surface portion or corner portion of the article and the vacuum heat insulating material. It becomes difficult and heat insulation performance of a heat insulation article can be maintained because heat leak from the space is controlled.

  In the present invention, the core material is preferably disposed at the position of the crease line portion of the vacuum heat insulating material bent along the curved surface portion and / or corner portion of the article. This is because the thickness of the vacuum heat insulating material at the crease line portion serving as the bent portion can be prevented from being reduced, and the heat insulating performance at the curved surface portion and / or the corner portion of the article can be prevented from decreasing.

  Hereinafter, the heat insulating article of the present invention will be described for each configuration.

1. Vacuum heat insulating material The vacuum heat insulating material in this invention is arrange | positioned at articles | goods. The vacuum heat insulating material has a core material and an outer packaging material facing so as to cover the core material, and a peripheral edge of the facing outer packaging material is sealed, and at least one of the opposed outer packaging materials It has a crease line part.
The details of the vacuum heat insulating material in the present invention are the same as the contents described in the section “A. Vacuum heat insulating material”, and thus the description thereof is omitted here.

2. Article The article in the present invention has at least one of a curved surface portion and a corner portion. Among these, it is preferable to have an article having at least one of a curved surface portion and a corner portion and having a heat retaining and cooling function.
Examples of the article having a curved surface portion include a hot water storage tank such as a water heater, a heat retaining tank, piping in a piping facility, and the like. On the other hand, the article having a corner has, for example, a refrigerator, a vending machine, a showcase, a refrigeration / air-conditioning apparatus, a storage, a box-shaped article such as a heat insulation box for transportation, and a double structure of an inner wall and an outer wall. Wall panel etc. are mentioned. In addition, a corner | angular part shall also contain the recessed part and convex part which have on the surface of an article | item.
The size, shape, etc. of the article are not particularly limited, and are appropriately designed according to the application.

3. Others The heat insulating article of the present invention can be disposed by bending the vacuum heat insulating material at the fold line portion so as to follow the curvature of the curved surface portion of the article, or hit the corner of the article.
There may be one or more vacuum heat insulating materials disposed on the article.

  As a method of arranging the vacuum heat insulating material on the article, there are a method of fixing the vacuum heat insulating material and the article through an adhesive layer, a method of fixing the outside of the vacuum heat insulating material pressed against the article with a resin or a string, and the like. Can be mentioned. Above all, it is preferable to arrange the vacuum heat insulating material and the article so as to be detachable, because it is possible to replace the vacuum heat insulating material whose heat insulating property is lowered.

  Although the vacuum heat insulating material arrange | positioned in parts other than the curved surface part or corner | angular part of an article | item may have a fold line part and does not need to have, it is preferable not to have. This is because the core material located at the fold line portion has a smaller thickness than other portions, and the heat insulation performance may be lowered.

  The present invention is not limited to the above embodiment. The above-described embodiment is an exemplification, and this embodiment has substantially the same configuration as the technical idea described in the claims of the present invention, and any device that exhibits the same function and effect is the present embodiment. It is included in the technical scope of the invention.

  The present invention will be described more specifically with reference to the following examples.

[Example 1]
(Preparation of outer packaging materials)
<Preparation of interlayer adhesive>
Two-component curing by mixing a main component mainly composed of polyester, a curing agent containing an aliphatic polyisocyanate, and ethyl acetate so that the weight blending ratio is main agent: curing agent: ethyl acetate = 10: 1: 10. A mold adhesive (hereinafter referred to as an interlayer adhesive) was prepared.

<Creation of outer packaging material>
As the first protective layer, a 25 μm thick nylon film (product name: ONM, manufactured by Unitika Co., Ltd.) with easy adhesion treatment on both sides is applied to the easy adhesion surface of the interlayer adhesive prepared at the above blending ratio. It apply | coated and dried using the die-coater so that it might become 3.5 g / m < ² >. Thereafter, a PET film (product name: PET, manufactured by Unitika Co., Ltd.) having a film thickness of 12 μm whose both surfaces were subjected to easy adhesion treatment as a second protective layer was laminated on the surface of the first protective layer to which an interlayer adhesive was applied.
Next, an interlayer adhesive was similarly applied at a coating amount of 3.5 g / m ² on the PET (second protective layer) surface of the obtained two-layer film and dried. An Al foil having a film thickness of 6 μm (product name: 1N30 manufactured by Sumikara Aluminum Foil Co., Ltd.) was laminated as a gas barrier layer on the surface of the second protective layer to which the interlayer adhesive was applied.
Subsequently, an interlayer adhesive was similarly applied at an application amount of 3.5 g / m ² on the Al foil (gas barrier layer) surface of the obtained three-layer film and dried. Laminate a linear (linear) low-density polyethylene (product name: FC-D, manufactured by Mitsui Chemicals, Inc.) on the surface of an Al foil coated with an interlayer adhesive, I got the material.

(Crease line forming process)
The outer packaging material described above was temporarily folded into a unidirectional bellows shape, then pressed with a heat press device (Kitakawa Seiki test press device KVHC) at 60 ° C. and 200 kgf / cm ² for 10 minutes, and a triangular crease line with an interval of 30 mm. Part (line width 2 mm, height 1 mm) was formed to obtain an outer packaging material (outer packaging material for vacuum heat insulating material) in which a crease line portion was formed.

(Sealing process)
The outer packaging material in which the crease line part was formed was piled up, and a bag body in which three sides were sealed by thermal welding and the remaining one was an opening was formed. A glass wool having a thickness of 1.0 cm is inserted as a core material from the opening of the bag body, and the inside of the bag is depressurized and deaerated to reduce the internal vacuum to 1.0 Pa or less, and the opening is thermally welded. Sealed to obtain a vacuum heat insulating material.

[Example 2]
A vacuum heat insulating material was obtained in the same manner as in Example 1 except that the thickness of the core material was 1.5 cm.

[Comparative Example 1]
A vacuum heat insulating material was obtained in the same manner as in Example 1 except that the crease line portion was not formed on the outer packaging material.

[Comparative Example 2]
A vacuum heat insulating material was obtained in the same manner as in Example 2 except that the crease line portion was not formed on the outer packaging material.

[Comparative Example 3]
A vacuum heat insulating material was obtained in the same manner as in Example 1 except that the crease line portion was not formed on the outer packaging material and the thickness of the encapsulating core material was 3.0 cm.

[Evaluation 1]
About the vacuum heat insulating material obtained by the Example and the comparative example, the presence or absence of a crease line part and its pattern shape were confirmed visually.
Moreover, thermal conductivity and flexibility were evaluated about the vacuum heat insulating material obtained by the Example and the comparative example. The thermal conductivity was measured according to JIS-A-1412-3 by a heat flow meter method using a thermal conductivity measuring device Auto Lambda (HC-074, manufactured by Eihiro Seiki Co., Ltd.). In addition, as for flexibility, a sample that could be wound around a cylinder having a diameter of 10 cm by hand was evaluated as ◯ (with flexibility), and a sample that could not be wound was determined as × (without flexibility).
The results are shown in Table 1.

  From Table 1, in the vacuum heat insulating materials of Examples 1 and 2, it was possible to bend using the crease line portion on the outer packaging material as a trigger. On the other hand, since the crease line part was not formed in the outer packaging material, the vacuum heat insulating materials of Comparative Examples 1 to 3 could not be bent.

[Examples 3a to 3c]
A vacuum heat insulating material was obtained in the same manner as in Example 1 except that the crease line portion forming step was performed according to the following procedure. In addition, the obtained vacuum heat insulating material had the crease line part which the outer packaging material which opposes each forms a convex shape in the core material side.

(Crease line forming process)
Embossed plate cylinders having convex portions with a semicircular cross-sectional shape formed on the surface, and embossed impression cylinders having recessed portions meshing with the embossed plate cylinders, arranged in series so that the embossed plate cylinders are on the lower side. And rotated in the opposite direction in synchronism at the same speed. The outer packaging material created in Example 1 was passed between the embossing plate cylinder and the embossing impression cylinder, and the embossing plate cylinder and the embossing impression cylinder were meshed to form a crease line portion on the outer packaging material. Table 2 shows the heights and pressing forces of the convex portions of the embossed plate cylinder at this time.
In the obtained outer packaging material, the crease line portion has a convex shape from the protective layer side of the outer packaging material toward the heat-welded layer side, the cross section is semicircular, and a flat portion between adjacent crease line portions. In addition, the crease line portion has a plane pattern parallel to one side of the outer packaging material.

[Evaluation 2]
The outer packaging material on which the crease line was formed was evaluated by a leak check. In addition, the obtained vacuum heat insulating material was checked for the presence or absence of a crease line and evaluated for flexibility.
For leak check, inject red penetrant (Mitsubishi Gas Chemical Co., Ltd., Ageless Seal Check Spray) into a bag made of outer packaging material with crease lines, and check for leaks of penetrant. The case where no leakage occurred was indicated by ○, and the case where red color was confirmed from the surface was indicated by ×.
Moreover, the presence or absence of the crease line part in a vacuum heat insulating material was judged by visual observation, and about the evaluation of flexibility, it was performed by the method similar to the above-mentioned evaluation 1.
The results are shown in Table 2.

  From the above examination, it was possible to manufacture a vacuum heat insulating material that can be easily bent and processed by using an outer packaging material in which a crease line portion is formed.

DESCRIPTION OF SYMBOLS 1a ... Outer packaging material 1b ... Outer packaging material (Outer packaging material for vacuum heat insulating materials)
2 ... Core material 3, 3A, 3B ... Crease line part 10 ... Vacuum heat insulating material 20A, 20B ... Heat insulating article 21A, 21B ... Article

Claims (2)

A vacuum heat insulating material manufacturing method for manufacturing a vacuum heat insulating material having a core material and an outer packaging material facing so as to cover the core material, wherein the peripheral edges of the facing outer packaging materials are sealed with each other,
A crease line portion forming step of pressing the outer packaging material using a transfer plate having a concavo-convex shape on the surface, and forming a crease line portion on the outer packaging material;
A sealing step of covering the core using the outer packaging material in which the crease line portion is formed, and then depressurizing and sealing the inside;
Have
In the crease line portion forming step, the crease line portion is formed in a state in which the two outer packaging materials are bonded to each other at least one of the peripheral edges . The outer packaging material has a rectangular shape,
In the crease line portion forming step, two opposing sides in the two outer packaging materials are bonded, and a crease line portion is formed in a cylindrical shape,
In the sealing step, after the crease line forming step, the core material is inserted into the two outer packaging materials in which one side other than the two opposite sides is bonded to form a bag, The method for producing a vacuum heat insulating material according to claim 1 , wherein the vacuum heat insulating material is sealed under reduced pressure.

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