JP2004257684A - Heat insulating box body and vacuum insulation material - Google Patents

Heat insulating box body and vacuum insulation material Download PDF

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Publication number
JP2004257684A
JP2004257684A JP2003050588A JP2003050588A JP2004257684A JP 2004257684 A JP2004257684 A JP 2004257684A JP 2003050588 A JP2003050588 A JP 2003050588A JP 2003050588 A JP2003050588 A JP 2003050588A JP 2004257684 A JP2004257684 A JP 2004257684A
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Japan
Prior art keywords
heat insulating
insulating material
box
vacuum heat
vacuum
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JP2003050588A
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JP4183530B2 (en
Inventor
Hitoshi Aoki
均史 青木
Hitoshi Hoshino
仁 星野
Hiromichi Mogi
弘道 茂木
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Sanyo Electric Co Ltd
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Sanyo Electric Co Ltd
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  • Refrigerator Housings (AREA)
  • Laminated Bodies (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heat insulating box preventing easy deterioration of heat insulation property even when inexpensive aluminum foil is used as one part of a metal foil of a vacuum insulation material. <P>SOLUTION: The heat insulating box body 7 manufactured by filling a foam heat insulation material 11 in an interior of an inner box 9 and a metal outer box 8 is characterized by that the vacuum insulation material 1 covered with a laminated film 3 using stainless steel foil 3a in one face and a laminated film 4 using the aluminum foil 4a in another face is arranged so that the other face of the vacuum insulation material 1 is adhered to an inner face of the outer box 8. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

【０００１】
【発明の属する技術分野】
本発明は、外箱と内箱間の空間に断熱材を設けて成る断熱箱体に関するものである。たとえば、冷凍冷蔵庫に用いられる断熱箱体に関する。また、断熱箱体の内部に配置される真空断熱材に関する。
【０００２】
【従来の技術】
従来より、冷蔵庫や低温ショーケース等を構成する断熱箱体は、外箱と内箱との間の空間に注入口より断熱材の原液を注入し、発泡充填することにより形成されている。
【０００３】
そして、この断熱箱体の断熱性能を高めるために、この断熱箱体の内部に偏平状（平板状）の真空断熱材を配置することが従来から提案実施されている（例えば特許文献１参照）。
【０００４】
この真空断熱材は、一般に、ガスバリヤー性を保持させた金属−プラスチックラミネートフィルムから成る外包容器を作成し、この内部にコア材を配置するものである。
【０００５】
このような真空断熱材の外包容器としては、アルミニウム箔と熱溶着性プラスチックのラミネートフィルムが一般的である。
【０００６】
２枚のラミネートフィルムの周囲部を接合することにより袋状の容器を形成し、この中に無機粉末やグラスファイバ等のコア材を入れて収容した状態で、外包容器内の空気を開口部から真空引きにより排出し、その後、この開口部を熱接合することによって密封される。
【０００７】
また、外包容器中には、気体を吸着するゲッター剤が配されている。
【０００８】
ところで、アルミニウムは熱伝導率が大きく、このため真空断熱材の周囲のラミネートフィルムを伝って熱が回り込む（所謂ヒートブリッジ）ことが発生してしまう。
【０００９】
このため、ラミネートフィルムのアルミニウム箔の代わりにステンレススチール箔を採用することが知られている。ステンレススチール箔のラミネートフィルムは、アルミニウムに比較して非常に高価であるが、熱伝導率及び微細孔に関しては性能が良く、断熱特性が向上する。
【００１０】
前述したように、ステンレススチール箔はアルミニウム箔に比較して非常に高価であるため、金属箔の一部を安価なアルミニウム箔とすることが、提案されている（例えば特許文献２、３参照）。
【００１１】
【特許文献１】
実開平４−７０９９５号公報
【特許文献２】
特開平８−１０５６８７号公報
【特許文献３】
特開平７−９８０９１号公報
【００１２】
【発明が解決しようとする課題】
本発明は、真空断熱材の金属箔の一部を安価なアルミニウム箔としても、断熱性能があまり劣化しない断熱箱体を提供することを目的とする。
【００１３】
また、本発明は、このような真空断熱材の使い勝手を良くすることを目的とする。
【００１４】
【課題を解決するための手段】
本発明は、内箱と金属製外箱の内部に発泡断熱材を充填して製造される断熱箱体において、一方の面がステンレススチール箔を用いたラミネートフィルムで覆われ他方の面がアルミニウム箔を用いたラミネートフィルムで覆われた真空断熱材を、この真空断熱材の前記他方の面を前記外箱の内面に貼り付けるように配置したことを特徴とする。
【００１５】
更に本発明は、前記真空断熱材の周辺に位置する前記ラミネートフィルムの熱溶着部を前記一方の面側に折り曲げ配置したことを特徴とする。
【００１６】
本発明は、内箱と金属製外箱の内部に発泡断熱材を充填して製造される断熱箱体において、一方の面が第１のラミネートフィルムで覆われ他方の面が第１のラミネートフィルムより熱伝導率の大きな第２のラミネートフィルムで覆われた真空断熱材を、この真空断熱材の前記他方の面を前記外箱の内面に貼り付けるように配置したことを特徴とする。
【００１７】
更に本発明は、 前記真空断熱材の周辺に位置する前記ラミネートフィルムの熱溶着部を前記一方の面側に折り曲げ配置したことを特徴とする。
【００１８】
本発明は、一方の面がステンレススチール箔を用いたラミネートフィルムで覆われ他方の面がアルミニウム箔を用いたラミネートフィルムで覆われた真空断熱材において、この真空断熱材の前記一方の面と他方の面を識別するための識別手段を設けたことを特徴とする。
【００１９】
更に本発明は、前記識別手段は、前記一方の面に施されていることを特徴とする。
【００２０】
【発明の実施の形態】
以下、図面を参照しながら本発明の実施形態を説明する。図１は、平板状の真空断熱材１の断面図を示している。図２は真空断熱材の図である。図３は断熱箱体の断面図である。
【００２１】
図１において、２はコア材であり、グラスウール等の無機物質を所定厚みの板状にしたものである。３は、ステンレススチール箔３ａを用いた第１のラミネートフィルムである。４は、アルミニウム箔４ａを用いた第２のラミネートフィルムである。５は、このラミネートフィルムのヒートシール部である。
【００２２】
図２は、真空断熱材１である。この真空断熱材１には、ステンレススチール箔を用いた第１のラミネートフィルム３側の面に油性ペンにより、丸印６が描かれている。この丸印６により作業者は、真空断熱材の裏表（取付面）が一目で判る。
【００２３】
図３において、断熱箱体７は家庭用の冷凍冷蔵庫を構成するものである。この断熱箱体７は、鋼板製の外箱８と、この外箱２内に間隔を存して組み込まれたＡＢＳ樹脂等の硬質合成樹脂製の内箱９と、両箱８、９間に設けられた断熱層１０とから構成されている。
【００２４】
そして、この断熱層１０は、真空断熱材１と発泡断熱材１１との二層構造となっている。
【００２５】
真空断熱材１は、前記発泡断熱１１が充填される以前に、外箱８の内面に両面テープ等にて予め取り付けて置く。
【００２６】
発泡断熱材１１は、ポリエーテルポリオールとポリイソシアネートを主成分としており、発泡剤としてはシクロペンタンを用いている。
【００２７】
発泡断熱材１１を充填する際には、外箱８の内面側に真空断熱材１のアルミニウム箔側を取り付け、内箱９を組み込んだものを発泡型（図示せず）にセットする。
【００２８】
そして、前記ポリエーテルポリオールをシクロペンタンの発泡剤により希釈してレジンとし、このレジン及び前記ポリイソシアネートの液を所定の割合で混合した原液を高圧発泡機により注入口から外箱８及び内箱９間の空間に吐出する。
【００２９】
注入された原液中のポリエーテルポリオールとポリイソシアネートは反応を開始してポリウレタンを生成すると共に、この反応熱によりシクロペンタンがガス化してフォームに封じ込められる。
【００３０】
一方、ポリウレタンフォームが膨張して内外箱９、８間の空間内に充満し、真空断熱材１と外箱８の内面、及び、内箱９に接着固化することにより、硬質ポリウレタンフォームの発泡断熱材１１が形成される。
【００３１】
内箱９の形状は、一般に通常複雑であり、外箱８の内面は内箱９に比して平坦であり、実施例の如く真空断熱材１を外箱８に取り付け、真空断熱材１と内箱９との間に発泡断熱材１１を充填すれば、真空断熱材１の取り付け作業が容易となる。
【００３２】
なお、真空断熱材１の周辺に位置する前記ラミネートフィルム３、４のヒートシール部５（熱溶着部５）は、ステンレススチール箔を用いたラミネートフィルム３側に折り曲げ配置し、断熱性能を向上させている。
【００３３】
このように、本実施形態では、熱伝導率の良いアルミニウム箔側を金属製外箱８側に貼り付けている。つまり、真空断熱材１の外箱に貼り付けられる側は、この外箱が金属製であるために、熱伝導率の小さなラミネートフィルムを用いても、その効果があまり期待できなかった。本実施形態では、そちら側に熱伝導率の高い（断熱性能の悪い）アルミニウム箔を用いたラミネートフィルムを用いることにより、真空断熱材のコストを下げると共に、それによる断熱性能の劣化を抑制することが可能となった。
【００３４】
【発明の効果】
以上の如く、請求項１、３によれば、安価で且つ断熱性能の劣化があまりない断熱箱体を提供することができる。
【００３５】
請求項２、４によれば、更に断熱性能を向上させることができる。
【００３６】
また、請求項５、６によれば、取り扱い時に真空断熱材の面を間違えることがない。
【図面の簡単な説明】
【図１】本発明の実施形態である真空断熱材の断面図である。
【図２】本発明の実施形態である真空断熱材の斜視図である。
【図３】本発明の実施形態である断熱箱体の断面図である。
【符号の説明】
【符号の説明】
１ 真空断熱材（平板状の真空断熱材）、
３ ラミネートフィルム、
３ａ ステンレススチール箔、
４ ラミネートフィルム、
４ａ アルミニウム箔、
５ ヒートシール部（熱溶着部）、
６ 油性ペンで描いた丸印（識別手段）、
７ 断熱箱体、
８ 外箱（金属製外箱）、
９ 内箱、
１１ 発泡断熱材。[0001]
TECHNICAL FIELD OF THE INVENTION
TECHNICAL FIELD The present invention relates to a heat insulating box body provided with a heat insulating material in a space between an outer box and an inner box. For example, the present invention relates to a heat insulating box used for a refrigerator. Further, the present invention relates to a vacuum heat insulating material arranged inside the heat insulating box.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, a heat-insulating box constituting a refrigerator, a low-temperature showcase, or the like is formed by injecting a stock solution of a heat-insulating material into a space between an outer box and an inner box from an inlet, and performing foam filling.
[0003]
In order to enhance the heat insulating performance of the heat insulating box, it has been conventionally proposed to arrange a flat (flat) vacuum heat insulating material inside the heat insulating box (for example, see Patent Document 1). .
[0004]
In general, this vacuum heat insulating material is one in which an outer container made of a metal-plastic laminated film having a gas barrier property is prepared, and a core material is disposed inside the outer container.
[0005]
As such an envelope of vacuum heat insulating material, a laminated film of an aluminum foil and a heat-welding plastic is generally used.
[0006]
A bag-shaped container is formed by joining the peripheral portions of the two laminated films, and a core material such as an inorganic powder or glass fiber is put in the container and housed therein. The opening is evacuated and then the opening is sealed by heat bonding.
[0007]
In addition, a getter agent that adsorbs gas is disposed in the outer container.
[0008]
By the way, aluminum has a large thermal conductivity, so that heat flows around the laminated film around the vacuum heat insulating material (so-called heat bridge).
[0009]
For this reason, it is known to employ a stainless steel foil instead of the aluminum foil of the laminate film. A laminated film of stainless steel foil is very expensive compared to aluminum, but has good performance in terms of thermal conductivity and micropores, and has improved heat insulating properties.
[0010]
As described above, since stainless steel foil is very expensive compared to aluminum foil, it has been proposed to use a part of metal foil as inexpensive aluminum foil (for example, see Patent Documents 2 and 3). .
[0011]
[Patent Document 1]
Japanese Utility Model Application Laid-Open No. 4-70995 [Patent Document 2]
JP-A-8-105687 [Patent Document 3]
JP-A-7-98091
[Problems to be solved by the invention]
An object of the present invention is to provide a heat insulating box in which the heat insulating performance is not significantly deteriorated even if a part of the metal foil of the vacuum heat insulating material is made of inexpensive aluminum foil.
[0013]
Another object of the present invention is to improve the usability of such a vacuum heat insulating material.
[0014]
[Means for Solving the Problems]
The present invention relates to a heat insulating box manufactured by filling a foam heat insulating material inside an inner box and a metal outer box, wherein one surface is covered with a laminate film using a stainless steel foil and the other surface is an aluminum foil. A vacuum heat insulating material covered with a laminate film using the above is arranged such that the other surface of the vacuum heat insulating material is attached to the inner surface of the outer box.
[0015]
Further, the present invention is characterized in that a heat-welded portion of the laminate film located around the vacuum heat insulating material is bent and arranged on the one surface side.
[0016]
The present invention relates to a heat insulating box manufactured by filling a foam heat insulating material inside an inner box and a metal outer box, wherein one surface is covered with a first laminate film and the other surface is a first laminate film. A vacuum heat insulating material covered with a second laminate film having a higher thermal conductivity is arranged such that the other surface of the vacuum heat insulating material is attached to the inner surface of the outer box.
[0017]
Further, the present invention is characterized in that a heat-welded portion of the laminate film located around the vacuum heat insulating material is bent and arranged on the one surface side.
[0018]
The present invention relates to a vacuum heat insulating material in which one surface is covered with a laminated film using a stainless steel foil and the other surface is covered with a laminated film using an aluminum foil. An identification means for identifying the surface is provided.
[0019]
Further, the present invention is characterized in that the identification means is provided on the one surface.
[0020]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows a cross-sectional view of a flat vacuum heat insulating material 1. FIG. 2 is a diagram of the vacuum heat insulating material. FIG. 3 is a sectional view of the heat insulating box.
[0021]
In FIG. 1, reference numeral 2 denotes a core material, which is made of an inorganic substance such as glass wool in a plate shape having a predetermined thickness. Reference numeral 3 denotes a first laminated film using a stainless steel foil 3a. Reference numeral 4 denotes a second laminated film using the aluminum foil 4a. Reference numeral 5 denotes a heat seal portion of the laminate film.
[0022]
FIG. 2 shows the vacuum heat insulating material 1. A circle 6 is drawn on the surface of the vacuum heat insulating material 1 on the side of the first laminate film 3 using a stainless steel foil with an oil-based pen. The operator can see at a glance the front and back (mounting surface) of the vacuum heat insulating material by the circle 6.
[0023]
In FIG. 3, a heat insulating box 7 constitutes a refrigerator for home use. The heat-insulating box 7 includes an outer box 8 made of a steel plate, an inner box 9 made of a hard synthetic resin such as an ABS resin incorporated in the outer box 2 with a space therebetween, and a space between the two boxes 8 and 9. And a heat insulating layer 10 provided.
[0024]
The heat insulating layer 10 has a two-layer structure of the vacuum heat insulating material 1 and the foam heat insulating material 11.
[0025]
The vacuum heat insulating material 1 is previously attached to the inner surface of the outer box 8 with a double-sided tape or the like before the foam heat insulating material 11 is filled.
[0026]
The foam heat insulating material 11 contains polyether polyol and polyisocyanate as main components, and uses cyclopentane as a foaming agent.
[0027]
When filling the foam heat insulating material 11, the aluminum foil side of the vacuum heat insulating material 1 is attached to the inner surface side of the outer box 8, and the one incorporating the inner box 9 is set in a foaming mold (not shown).
[0028]
Then, the polyether polyol is diluted with a blowing agent of cyclopentane to form a resin, and an undiluted solution obtained by mixing the resin and the liquid of the polyisocyanate at a predetermined ratio is injected from an inlet into an outer box 8 and an inner box 9 by a high-pressure foaming machine. Discharge into the space between.
[0029]
The polyether polyol and the polyisocyanate in the injected stock solution start a reaction to form polyurethane, and the heat of the reaction gasifies cyclopentane to be sealed in the foam.
[0030]
On the other hand, the polyurethane foam expands and fills the space between the inner and outer boxes 9 and 8, and is adhered and solidified to the vacuum heat insulating material 1 and the inner surface of the outer box 8 and the inner box 9. The material 11 is formed.
[0031]
In general, the shape of the inner box 9 is generally complicated, the inner surface of the outer box 8 is flatter than the inner box 9, and the vacuum heat insulating material 1 is attached to the outer box 8 as in the embodiment, and By filling the foam insulation 11 with the inner box 9, the work of attaching the vacuum insulation 1 becomes easy.
[0032]
In addition, the heat sealing part 5 (heat welding part 5) of the said laminated films 3 and 4 located in the periphery of the vacuum heat insulating material 1 is bent and arrange | positioned at the laminated film 3 side using stainless steel foil, and heat insulation performance is improved. ing.
[0033]
As described above, in the present embodiment, the aluminum foil having good heat conductivity is attached to the metal outer box 8 side. That is, on the side of the vacuum heat insulating material 1 to be attached to the outer box, the effect was not so much expected even if a laminated film having a small thermal conductivity was used because the outer box was made of metal. In the present embodiment, by using a laminated film using an aluminum foil having a high thermal conductivity (poor heat insulation performance) on the side thereof, it is possible to reduce the cost of the vacuum heat insulating material and to suppress the deterioration of the heat insulation performance due thereto. Became possible.
[0034]
【The invention's effect】
As described above, according to the first and third aspects, it is possible to provide an insulated box that is inexpensive and has little deterioration in heat insulation performance.
[0035]
According to the second and fourth aspects, the heat insulation performance can be further improved.
[0036]
According to the fifth and sixth aspects, the surface of the vacuum heat insulating material is not mistaken during handling.
[Brief description of the drawings]
FIG. 1 is a sectional view of a vacuum heat insulating material according to an embodiment of the present invention.
FIG. 2 is a perspective view of a vacuum heat insulating material according to an embodiment of the present invention.
FIG. 3 is a cross-sectional view of a heat insulating box according to an embodiment of the present invention.
[Explanation of symbols]
[Explanation of symbols]
1 vacuum insulation (flat vacuum insulation),
3 laminated film,
3a stainless steel foil,
4 Laminated film,
4a aluminum foil,
5 heat sealing part (heat welding part),
6 Circles (identification means) drawn with an oil-based pen,
7 Insulated box,
8 outer box (metal outer box),
9 Inner box,
11 Foam insulation.

Claims (6)

内箱（９）と金属製外箱（８）の内部に発泡断熱材（１１）を充填して製造される断熱箱体（７）において、
一方の面がステンレススチール箔（３ａ）を用いたラミネートフィルム（３）で覆われ他方の面がアルミニウム箔（４ａ）を用いたラミネートフィルム（４）で覆われた真空断熱材（１）を、この真空断熱材（１）の前記他方の面を前記外箱（８）の内面に貼り付けるように配置したことを特徴とする断熱箱体。In a heat insulating box (7) manufactured by filling a foam heat insulating material (11) inside an inner box (9) and a metal outer box (8),
A vacuum heat insulating material (1) having one surface covered with a laminate film (3) using a stainless steel foil (3a) and the other surface covered with a laminate film (4) using an aluminum foil (4a), A heat insulating box, wherein the other surface of the vacuum heat insulating material (1) is arranged so as to be attached to an inner surface of the outer box (8). 前記真空断熱材の周辺に位置する前記ラミネートフィルムの熱溶着部（５）を前記一方の面側に折り曲げ配置したことを特徴とする請求項１に記載の断熱箱体。The heat insulating box according to claim 1, wherein a heat-welded portion (5) of the laminate film located around the vacuum heat insulating material is bent and arranged on the one surface side. 内箱（９）と金属製外箱（８）の内部に発泡断熱材（１１）を充填して製造される断熱箱体（７）において、
一方の面が第１のラミネートフィルム（３）で覆われ他方の面が第１のラミネートフィルム（３）より熱伝導率の大きな第２のラミネートフィルム（４）で覆われた真空断熱材（１）を、この真空断熱材（１）の前記他方の面を前記外箱（８）の内面に貼り付けるように配置したことを特徴とする断熱箱体。In a heat insulating box (7) manufactured by filling a foam heat insulating material (11) inside an inner box (9) and a metal outer box (8),
A vacuum heat insulating material (1) in which one surface is covered with a first laminate film (3) and the other surface is covered with a second laminate film (4) having a higher thermal conductivity than the first laminate film (3) ) Is arranged such that the other surface of the vacuum heat insulating material (1) is attached to the inner surface of the outer box (8). 前記真空断熱材の周辺に位置する前記ラミネートフィルムの熱溶着部（５）を前記一方の面側に折り曲げ配置したことを特徴とする請求項３に記載の断熱箱体。The heat insulating box according to claim 3, wherein a heat-welded portion (5) of the laminate film located around the vacuum heat insulating material is bent and arranged on the one surface side. 一方の面がステンレススチール箔を用いたラミネートフィルムで覆われ他方の面がアルミニウム箔を用いたラミネートフィルムで覆われた真空断熱材において、この真空断熱材の前記一方の面と他方の面を識別するための識別手段（６）を設けたことを特徴とする真空断熱材。In a vacuum heat insulating material in which one surface is covered with a laminated film using a stainless steel foil and the other surface is covered with a laminated film using an aluminum foil, the one surface and the other surface of the vacuum heat insulating material are identified. A vacuum insulation material provided with an identification means (6) for performing the operation. 前記識別手段は、前記一方の面に施されていることを特徴とする請求項５に記載の真空断熱材。The vacuum heat insulating material according to claim 5, wherein the identification means is provided on the one surface.
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Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6347481U (en) * 1986-09-11 1988-03-31
JPS6357481U (en) * 1986-10-03 1988-04-16
JPH08105687A (en) * 1994-10-05 1996-04-23 Hitachi Ltd Vacuum insulating material
JPH08170789A (en) * 1994-12-19 1996-07-02 Matsushita Refrig Co Ltd Vacuum heat insulating body
JP2001165557A (en) * 1999-12-10 2001-06-22 Matsushita Refrig Co Ltd Refrigerator
JP2002347852A (en) * 2001-03-15 2002-12-04 Showa Denko Plastic Products Co Ltd Drip absorbing sheet for packaging perishable food
JP2003014368A (en) * 2001-06-28 2003-01-15 Matsushita Refrig Co Ltd Refrigerator
JP2003028562A (en) * 2001-07-12 2003-01-29 Matsushita Refrig Co Ltd Refrigerator and method of manufacturing the same
JP2003029878A (en) * 2001-07-12 2003-01-31 Matsushita Refrig Co Ltd Notebook-sized personal computer

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6347481U (en) * 1986-09-11 1988-03-31
JPS6357481U (en) * 1986-10-03 1988-04-16
JPH08105687A (en) * 1994-10-05 1996-04-23 Hitachi Ltd Vacuum insulating material
JPH08170789A (en) * 1994-12-19 1996-07-02 Matsushita Refrig Co Ltd Vacuum heat insulating body
JP2001165557A (en) * 1999-12-10 2001-06-22 Matsushita Refrig Co Ltd Refrigerator
JP2002347852A (en) * 2001-03-15 2002-12-04 Showa Denko Plastic Products Co Ltd Drip absorbing sheet for packaging perishable food
JP2003014368A (en) * 2001-06-28 2003-01-15 Matsushita Refrig Co Ltd Refrigerator
JP2003028562A (en) * 2001-07-12 2003-01-29 Matsushita Refrig Co Ltd Refrigerator and method of manufacturing the same
JP2003029878A (en) * 2001-07-12 2003-01-31 Matsushita Refrig Co Ltd Notebook-sized personal computer

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