JP4649969B2 - Vacuum insulation - Google Patents

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JP4649969B2
JP4649969B2 JP2004353718A JP2004353718A JP4649969B2 JP 4649969 B2 JP4649969 B2 JP 4649969B2 JP 2004353718 A JP2004353718 A JP 2004353718A JP 2004353718 A JP2004353718 A JP 2004353718A JP 4649969 B2 JP4649969 B2 JP 4649969B2
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film
film layer
heat insulating
density polyethylene
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JP2006161945A (en
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篤 辻井
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Toppan Inc
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Description

本発明は、冷蔵庫、自動販売機、ジャーポットなどの保冷・保温機器に取り付けて、断熱効果を発揮する真空断熱材に関するものである。   The present invention relates to a vacuum heat insulating material that exerts a heat insulating effect by being attached to a cold and heat insulating device such as a refrigerator, a vending machine, and a jar pot.

従来、冷蔵庫、自動販売機、ジャーポットなどの保冷・保温機器には、種々の断熱材が使用されており、特に、断熱性能の優れた断熱材としては、断熱性コア材を外装体内に封入し、内部を真空排気した構成の真空断熱材が使用されていた。この外装体は、外部からのガス（空気）の侵入を防ぎ、内部を長期真空状態に保持するために、ガスバリア性に優れたものである必要があった。そこで、従来は、高いバリア性を付与するために、バリア層として、６〜２０μｍ程度の厚みのアルミニウム箔層を構成層中にもつ外装材が用いられていた。   Conventionally, various heat insulating materials have been used for refrigerators, vending machines, jar pots, and other cold insulation devices. Especially, as a heat insulating material with excellent heat insulating performance, a heat insulating core material is enclosed in the exterior body. However, a vacuum heat insulating material having a configuration in which the inside is evacuated is used. This exterior body needs to be excellent in gas barrier properties in order to prevent the ingress of gas (air) from the outside and keep the inside in a vacuum state for a long time. Therefore, conventionally, an exterior material having an aluminum foil layer having a thickness of about 6 to 20 μm in the constituent layer has been used as a barrier layer in order to impart high barrier properties.

しかし、アルミニウム箔層を構成層中にもつ外装材は、ガスバリア性には優れているが、アルミニウム自体の熱伝導率が高いため、アルミニウム箔層を介して熱が伝わり、断熱効果が低下する、所謂、ヒートブリッジ現象の問題があった。このヒートブリッジ現象を解決するために、バリア層として、アルミニウム箔層の代わりに、比較的に熱伝導率が小さいステンレス箔層を用いる方法（例えば、特許文献１参照）、セラミック蒸着フィルム層を用いる方法（例えば、特許文献２参照）、アルミニウム蒸着フィルム層を用いる方法などが知られていた。
特開平８−１５９３７６号公報 特開平８−１５２２５８号公報 However, the exterior material having an aluminum foil layer in the constituent layers is excellent in gas barrier properties, but because of the high thermal conductivity of aluminum itself, heat is transmitted through the aluminum foil layer, and the heat insulating effect is reduced. There was a problem of so-called heat bridge phenomenon. In order to solve this heat bridge phenomenon, a method using a stainless foil layer having a relatively low thermal conductivity instead of an aluminum foil layer as a barrier layer (for example, see Patent Document 1), a ceramic vapor deposition film layer is used. Methods (for example, refer to Patent Document 2), methods using an aluminum vapor deposition film layer, and the like have been known.
JP-A-8-159376 JP-A-8-152258

しかしながら、バリア層としてステンレス箔層を用いた方法では、なお、ステンレスの熱伝導率が高いため、ヒートブリッジ現象の低減が不十分であった。また、バリア層としてセラミック蒸着フィルム層を用いた方法やアルミニウム蒸着フィルム層を用いる方法は、ヒートブリッジ現象の低減は十分であったが、ガスバリア性が不十分であり、長期間にわたって真空状態を保つことが不可能であった。   However, in the method using a stainless steel foil layer as the barrier layer, the thermal conductivity of stainless steel is still high, so that the reduction of the heat bridge phenomenon is insufficient. In addition, the method using a ceramic vapor-deposited film layer or the method using an aluminum vapor-deposited film layer as the barrier layer was sufficient to reduce the heat bridge phenomenon, but the gas barrier property was insufficient, and the vacuum state was maintained for a long period of time. It was impossible.

本発明は、上述の従来の真空断熱材における問題点を解決したものであり、外装体を通して熱移動により断熱効果が低下するヒートブリッジ現象が少なく、外装体のガスバリア性が高く長期にわたって内部の真空状態が保たれ、良好な断熱性能を有する真空断熱材を提供するものである。   The present invention solves the above-described problems in the conventional vacuum heat insulating material, and there is little heat bridge phenomenon in which the heat insulation effect is reduced by heat transfer through the outer package, and the gas barrier property of the outer package is high and the internal vacuum is maintained over a long period of time. The present invention provides a vacuum heat insulating material that maintains its state and has good heat insulating performance.

すなわち、本発明の第１の発明は、ポリエチレンテレフタレートフィルム層、ナイロンフィルム層、アルミニウム箔層、高密度ポリエチレンフィルム層からなる積層フィルムと、無機酸化物蒸着層を多層有するバリアフィルム層、ナイロンフィルム層、無機酸化物蒸着層を多層有するバリアフィルム層、高密度ポリエチレンフィルム層からなる積層フィルムとからなり、前記高密度ポリエチレンフィルム層を内側とした包装袋に断熱性コア材を封入し内部を真空密封してなる真空断熱材である。 That is, the first invention of the present invention is a barrier film layer, a nylon film layer having a multilayer film comprising a polyethylene terephthalate film layer, a nylon film layer, an aluminum foil layer, a high density polyethylene film layer, and an inorganic oxide vapor deposition layer. It consists of a barrier film layer having a multilayer inorganic oxide vapor deposition layer and a laminated film composed of a high-density polyethylene film layer. A heat-insulating core material is sealed in a packaging bag with the high-density polyethylene film layer inside, and the inside is vacuum-sealed. This is a vacuum heat insulating material.

そして、本発明の第２の発明は、ポリエチレンテレフタレートフィルム層、ナイロンフィルム層、アルミニウム箔層、高密度ポリエチレンフィルム層からなる積層フィルムと、ナイロンフィルム層、無機酸化物蒸着層を多層有するバリアフィルム層、無機酸化物蒸着層を多層有するバリアフィルム層、高密度ポリエチレンフィルム層、又は無機酸化物蒸着層を多層有するバリアフィルム層、無機酸化物蒸着層を多層有するバリアフィルム層、ナイロンフィルム層、高密度ポリエチレンフィルム層、からなる積層フィルムとからなり、前記高密度ポリエチレンフィルム層を内側とした包装袋に断熱性コア材を封入し内部を真空密封してなる真空断熱材である。 The second invention of the present invention is a barrier film layer comprising a multilayer film comprising a polyethylene terephthalate film layer, a nylon film layer, an aluminum foil layer, a high-density polyethylene film layer, a nylon film layer, and an inorganic oxide vapor deposition layer. , Barrier film layer having a multilayer inorganic oxide deposition layer, high density polyethylene film layer, barrier film layer having a multilayer inorganic oxide deposition layer, barrier film layer having a multilayer inorganic oxide deposition layer, nylon film layer, high density It is a vacuum heat insulating material comprising a laminated film comprising a polyethylene film layer, in which a heat insulating core material is enclosed in a packaging bag with the high density polyethylene film layer inside, and the inside is vacuum-sealed .

本発明の真空断熱材は、表裏のいずれか一方の外装体に、ガスバリア層としてアルミニウム箔層を構成層中に有する積層フィルムを用いているが、他方の外装体に、ガスバリア層として無機酸化物蒸着層を多層有するバリアフィルム層を構成層中に少なくとも２層有する積層フィルムを用いたものであり、無機酸化物蒸着層を多層有するバリアフィルム層は、アルミニウム箔層と比較して熱の伝導が悪いため、従来の表裏の外装体に、ガスバリア層としてアルミニウム箔層を構成層中に有する積層フィルムを用いた真空断熱材と比較して、外装体を通して熱移動により断熱効果が低下するヒートブリッジ現象が少ない。   In the vacuum heat insulating material of the present invention, a laminated film having an aluminum foil layer as a gas barrier layer in a constituent layer is used for either the front or back exterior body, but the other exterior body has an inorganic oxide as a gas barrier layer. A laminated film having at least two barrier film layers having a multilayer deposited layer is used, and the barrier film layer having a multilayer inorganic oxide deposited layer has heat conduction compared to an aluminum foil layer. Heat bridge phenomenon in which the heat insulation effect is reduced by heat transfer through the exterior body compared to the vacuum insulation material using the laminated film having the aluminum foil layer as the gas barrier layer in the constituent layer in the conventional exterior body for the front and back Less is.

また、本発明の真空断熱材は、表裏のいずれか一方の外装体に、ガスバリア層としてアルミニウム箔層を構成層中に有する積層フィルムを用い、他方の外装体に、ガスバリア層として無機酸化物蒸着層を多層有するバリアフィルム層を構成層中に２層有する積層フィルムを用いたものであり、外装体のガスバリア性が高いため、長期にわたって内部の真空状態が保たれ、断熱性能が良好に維持される。   Moreover, the vacuum heat insulating material of the present invention uses a laminated film having an aluminum foil layer as a gas barrier layer in a constituent layer for either one of the front and back exterior bodies, and deposits inorganic oxide as a gas barrier layer on the other exterior body. It uses a laminated film that has two layers of barrier film layers in its constituent layers, and because the gas barrier property of the exterior body is high, the internal vacuum state is maintained over a long period of time, and the heat insulation performance is maintained well. The

本発明の真空断熱材は、ガスバリア層としてアルミニウム箔層を構成層中に有する積層フィルムかなる表裏のいずれか一方の外装体と、ガスバリア層として無機酸化物蒸着層を多層有するバリアフィルム層を構成層中に２層有する積層フィルムとからなる他方の外装体との内部に、断熱性コア材を真空排気して封入したものである。   The vacuum heat insulating material of the present invention comprises a barrier film layer having a multilayered film having an inorganic oxide vapor deposition layer as a gas barrier layer, and either a front or back exterior body comprising a laminated film having an aluminum foil layer as a gas barrier layer A heat-insulating core material is evacuated and sealed inside the other exterior body composed of a laminated film having two layers in the layer.

以下に、本発明の具体的な実施例を図を用いて説明する。   Specific examples of the present invention will be described below with reference to the drawings.

図１（ａ）は、本実施例の真空断熱材の構造を示す断面図であり、図１（ｂ）は、表側の積層フィルムＡの構成を示す断面図で、図１（ｃ）は、裏側の積層フィルムＢの構成を示す断面図である。また、図２は、比較例２の真空断熱材の表側及び裏側の積層フィルムＣの構成を示す断面図である。   FIG. 1A is a cross-sectional view showing the structure of the vacuum heat insulating material of this example, FIG. 1B is a cross-sectional view showing the structure of the front laminated film A, and FIG. It is sectional drawing which shows the structure of the laminated film B of a back side. FIG. 2 is a cross-sectional view showing the configuration of the laminated film C on the front side and the back side of the vacuum heat insulating material of Comparative Example 2.

本実施例の真空断熱材は、まず、１２μｍ厚のポリエチレンテレフタレートフィルムにウレタン系接着材を３ｇ／ｍ2 塗布して１５μｍ厚のナイロンフィルムを貼り合わせ、この２層の積層フィルムのナイロンフィルム面にウレタン系接着材を３ｇ／ｍ2 塗布して６μｍ厚のアルミニウム箔を貼り合わせ、この３層の積層フィルムのアルミニウム箔にウレタン系接着材を３ｇ／ｍ2 塗布して５０μｍ厚の高密度ポリエチレンを貼り合わせて、図１（ｂ）に示す〔外側〕ポリエチレンテレフタレートフィルム層（１１０）／ナイロンフィルム層（１２０）／アルミニウム箔層（１３０）／高密度ポリエチレンフィルム層（１４０）〔コア材側〕構成の積層フィルムＡ（１００）を作製し、次に、１２μｍ厚の無機酸化物蒸着層を２層有するバリアフィルムである凸版印刷株式会社製ＧＸフィルム（商品名）にウレタン系接着材を３ｇ／ｍ2 塗布して２５μｍ厚のナイロンフィルムを貼り合わせ、この２層の積層フィルムのナイロンフィルム面にウレタン系接着材を３ｇ／ｍ2 塗布して１２μｍ厚の無機酸化物蒸着層を２層有するバリアフィルムである凸版印刷株式会社製ＧＸフィルム（商品名）を貼り合わせ、この３層の積層フィルムのＧＸフィルムにウレタン系接着材を３ｇ／ｍ2 塗布して５０μｍ厚の高密度ポリエチレンを貼り合わせて、図１（ｃ）に示す〔外側〕凸版印刷株式会社製ＧＸフィルム（商品名）層（２１０）／ナイロンフィルム層（２２０）／凸版印刷株式会社製ＧＸフィルム（商品名）層（２３０）／
高密度ポリエチレンフィルム層（２４０）〔コア材側〕構成の積層フィルムＢ（２００）を作製し、次に、上述した積層フィルムＡと積層フィルムＢを用い、表側の外装体が積層フィルムＡ（１００）で裏側の外装体が積層フィルムＢ（２００）からなる包装袋を作製し、そして、内側に断熱性コア材（３００）として粉末シリカの成形体を真空密封して、図１（ａ）に示す実施例１の真空断熱材（１０）を作製したものである。なお、積層フィルムのコア側に用いられる高密度ポリエチレン層は、シーラント層であり、真空断熱材の端面からのバリア低下を防止して真空度維持のために、密度０．９４１〜０．９６５の高密度ポリエチレンが用いられる。また、ナイロンフィルム層は、耐ピンホール性を付与するために用いるものである。なお、積層フィルムＢの構成順は、〔外側〕ナイロンフィルム層／凸版印刷株式会社製ＧＸフィルム（商品名）層／凸版印刷株式会社製ＧＸフィルム（商品名）層／高密度ポリエチレンフィルム層〔コア材側〕構成又は〔外側〕凸版印刷株式会社製ＧＸフィルム（商品名）層／凸版印刷株式会社製ＧＸフィルム（商品名）層／ナイロンフィルム層／高密度ポリエチレンフィルム層〔コア材側〕構成としてもよい。 In the vacuum heat insulating material of this example, first, 3 g / m 2 of urethane-based adhesive was applied to a 12 μm thick polyethylene terephthalate film, and a 15 μm thick nylon film was bonded to the nylon film surface of this two-layer laminated film. a urethane-based adhesive bonded aluminum foil 6μm thick and 3 g / m 2 coating, a 50μm thick high-density polyethylene a urethane-based adhesive to an aluminum foil with 3 g / m 2 coating of the laminated film of three layers 1 [b] Polyethylene terephthalate film layer (110) / nylon film layer (120) / aluminum foil layer (130) / high density polyethylene film layer (140) [core material side] configuration shown in FIG. Next, a barrier film having two layers of 12 μm thick inorganic oxide vapor-deposited layers was prepared. Rum is a GX film (trade name) manufactured by Toppan Printing Co., Ltd. 3 g / m 2 of urethane adhesive is applied and a 25 μm thick nylon film is bonded together. The urethane film is bonded to the nylon film surface of this two-layer laminate film. A GX film (trade name) manufactured by Toppan Printing Co., Ltd., which is a barrier film having 2 layers of 12 μm-thick inorganic oxide vapor-deposited layers coated with 3 g / m 2 , is laminated on the GX film of this three-layer laminated film. Applying 3g / m 2 of urethane adhesive and bonding 50μm thick high density polyethylene, [Outside] GX Film (trade name) layer (210) / nylon shown by Fig. 1 (c) Film layer (220) / Toppan Printing Co., Ltd. GX film (trade name) layer (230) /
A laminated film B (200) having a configuration of a high-density polyethylene film layer (240) [core material side] is produced, and then the above-described laminated film A and laminated film B are used, and the outer package on the front side is laminated film A (100 ) And the outer packaging body of the back side is made of the laminated film B (200), and the molded body of powdered silica is vacuum-sealed as the heat insulating core material (300) on the inner side, and FIG. The vacuum heat insulating material (10) of Example 1 shown is produced. Note that the high-density polyethylene layer used on the core side of the laminated film is a sealant layer, and has a density of 0.941 to 0.965 in order to prevent the barrier from lowering from the end face of the vacuum heat insulating material and maintain the degree of vacuum. High density polyethylene is used. The nylon film layer is used for imparting pinhole resistance. The composition order of the laminated film B is as follows: [Outside] Nylon film layer / Toppan Printing Co., Ltd. GX film (trade name) layer / Toppan Printing Co., Ltd. GX film (trade name) layer / High density polyethylene film layer [Core Material side] Configuration or [Outside] GX film (trade name) layer manufactured by Toppan Printing Co., Ltd./GX film (trade name) layer manufactured by Toppan Printing Co., Ltd./nylon film layer / high density polyethylene film layer [core material side] configuration Also good.

＜比較例１＞
実施例で作製した図１（ｂ）に示す積層フィルムＡ（１００）を用い、実施例と同様に、表側の外装体と裏側の外装体が積層フィルムＡからなる包装袋を作製し、そして、内側に断熱性コア材として粉末シリカの成形体を真空密封して、比較例１の真空断熱材を作製した。 <Comparative Example 1>
Using the laminated film A (100) shown in FIG. 1 (b) produced in the example, a packaging bag in which the outer package body on the front side and the outer package body on the back side are made of the laminated film A as in the example, and The powder silica molded body was vacuum sealed inside as a heat insulating core material, and the vacuum heat insulating material of Comparative Example 1 was produced.

＜比較例２＞
１２μｍ厚の無機酸化物蒸着層を１層有するバリアフィルムである凸版印刷株式会社製ＧＬフィルム（商品名）にウレタン系接着材を３ｇ／ｍ2 塗布して２５μｍ厚のナイロンフィルムを貼り合わせ、この２層の積層フィルムのナイロンフィルム面にウレタン系接着材を３ｇ／ｍ2 塗布して５０μｍ厚の高密度ポリエチレンを貼り合わせて、図２に示す〔外側〕凸版印刷株式会社製ＧＬフィルム（商品名）層（４１０）／ナイロンフィルム層（４２０）／高密度ポリエチレンフィルム層（４３０）〔コア材側〕構成の積層フィルムＣ（４００）を作製し、次に、この積層フィルムＣを用い、実施例と同様に、表側の外装体と裏側の外装体が積層フィルムＣからなる包装袋を作製し、そして、内側に断熱性コア材として粉末シリカの成形体を真空密封して、比較例２の真空断熱材を作製した。 <Comparative Example 2>
3 g / m 2 of urethane adhesive is applied to a GL film (trade name) manufactured by Toppan Printing Co., Ltd., which is a barrier film having a 12 μm-thick inorganic oxide vapor deposition layer, and a 25 μm-thick nylon film is bonded together. A urethane adhesive is applied at 3 g / m 2 on the nylon film surface of the two-layer laminated film, and 50 μm-thick high-density polyethylene is bonded to the GL film manufactured by Toppan Printing Co., Ltd. ) Layer (410) / nylon film layer (420) / high-density polyethylene film layer (430) [core material side] laminated film C (400) was prepared, and then this laminated film C was used as an example. In the same manner as above, a packaging bag in which the outer packaging body on the front side and the outer packaging body on the back side are made of the laminated film C is manufactured, and the molded body of powdered silica is vacuum sealed as a heat insulating core material on the inside Sealed to produce the vacuum heat insulating material of Comparative Example 2.

＜特性評価＞
次に、実施例、比較例１及び比較例２の３種類の真空断熱材について、その特性を比較評価した。評価結果を表１及び表２に示す。表１は、真空断熱材のガスバリア性及び熱伝導の特性評価結果であり、表２は、外装体である積層フィルムの防湿性及び突刺強度の特性評価結果である。 <Characteristic evaluation>
Next, the characteristics of the three types of vacuum heat insulating materials of Example, Comparative Example 1 and Comparative Example 2 were comparatively evaluated. The evaluation results are shown in Tables 1 and 2. Table 1 shows the evaluation results of gas barrier properties and heat conduction characteristics of the vacuum heat insulating material, and Table 2 shows the evaluation results of moisture resistance and puncture strength of the laminated film as the outer package.

Figure 0004649969
Figure 0004649969

Figure 0004649969
表１の真空断熱材の特性評価結果に示されているように、実施例の真空断熱材は、表側の外装体は、バリア層としてアルミニウム箔層を有する積層フィルムであるが、裏面の外装体は、バリア層とする凸版印刷株式会社製ＧＸフィルム（商品名）層を２層有する積層フィルムであり、真空断熱材の外装体を通しての熱の移動が少なく、従って、比較例１の真空断熱材と比較して断熱効果の低下が少ない。また、比較例２の真空断熱材と比較してバリア性が良好なことにより、長期にわたって表裏の外装体内の真空状態が保たれ、良好な断熱性能が長期維持される。
Figure 0004649969
 As shown in the characteristics evaluation results of the vacuum heat insulating material in Table 1, the vacuum heat insulating material of the example is a laminated film having an aluminum foil layer as a barrier layer on the front side outer body, Is a laminated film having two GX film (trade name) layers manufactured by Toppan Printing Co., Ltd. serving as a barrier layer, and there is little heat transfer through the exterior body of the vacuum heat insulating material. Therefore, the vacuum heat insulating material of Comparative Example 1 Compared with, there is little decrease in heat insulation effect. Further, since the barrier property is better than that of the vacuum heat insulating material of Comparative Example 2, the vacuum state in the front and back exterior bodies is maintained for a long time, and good heat insulating performance is maintained for a long time.

なお、表２の積層フィルムの特性評価結果に示されているように、積層フィルムＡは、防湿性が極めて良好であり、突刺強度が強い。積層フィルムＢは、他の積層フィルムＡ及
び積層フィルムＣと比較して突刺強度に劣り、積層フィルムＣは、防湿性が積層フィルムＡに比較して劣る。 In addition, as shown by the characteristic evaluation result of the laminated film in Table 2, the laminated film A has extremely good moisture resistance and strong puncture strength. The laminated film B is inferior in puncture strength as compared with the other laminated films A and C, and the laminated film C is inferior in moisture resistance as compared with the laminated film A.

（ａ）は、本発明の実施例の真空断熱材の構造を示す断面図であり、（ｂ）は、その表側に用いられた積層フィルムＡの構成を示す断面図で、（ｃ）は、裏側に用いられた積層フィルムＢの構成を示す断面図である。(A) is sectional drawing which shows the structure of the vacuum heat insulating material of the Example of this invention, (b) is sectional drawing which shows the structure of the laminated | multilayer film A used for the front side, (c), It is sectional drawing which shows the structure of the laminated film B used for the back side. 比較例２の真空断熱材の表側及び裏側に用いられた積層フィルムＣの構成を示す断面図である。It is sectional drawing which shows the structure of the laminated film C used for the front side and back side of the vacuum heat insulating material of the comparative example 2.

符号の説明Explanation of symbols

１０……真空断熱材
１００……積層フィルムＡ
１１０……ポリエチレンテレフタレートフィルム層
１２０，２２０，４２０……ナイロンフィルム層
１３０……アルミニウム箔層
１４０，２４０，４３０……高密度ポリエチレンフィルム層
２００……積層フィルムＢ
２１０，２３０……凸版印刷株式会社製ＧＸフィルム（商品名）層
３００……断熱性コア材
４００……積層フィルムＣ
４１０……凸版印刷株式会社製ＧＬフィルム（商品名）層 10 ... Vacuum insulation 100 ... Laminated film A
110... Polyethylene terephthalate film layer 120, 220, 420... Nylon film layer 130... Aluminum foil layer 140, 240, 430.
210, 230 ... Toppan Printing Co., Ltd. GX film (trade name) layer 300 ... Insulating core material 400 ... Laminated film C
410 …… GL film (trade name) layer manufactured by Toppan Printing Co., Ltd.

Claims (2)

ポリエチレンテレフタレートフィルム層、ナイロンフィルム層、アルミニウム箔層、高密度ポリエチレンフィルム層からなる積層フィルムと、無機酸化物蒸着層を多層有するバリアフィルム層、ナイロンフィルム層、無機酸化物蒸着層を多層有するバリアフィルム層、高密度ポリエチレンフィルム層からなる積層フィルムとからなり、前記高密度ポリエチレンフィルム層を内側とした包装袋に断熱性コア材を封入し内部を真空密封してなる真空断熱材。 Laminated film composed of polyethylene terephthalate film layer, nylon film layer, aluminum foil layer, high density polyethylene film layer, barrier film layer having multilayered inorganic oxide deposited layer, nylon film layer, barrier film having multilayered inorganic oxide deposited layer A vacuum heat insulating material comprising a laminated film comprising a layer and a high density polyethylene film layer, wherein a heat insulating core material is enclosed in a packaging bag with the high density polyethylene film layer inside, and the inside is vacuum-sealed . ポリエチレンテレフタレートフィルム層、ナイロンフィルム層、アルミニウム箔層、高密度ポリエチレンフィルム層からなる積層フィルムと、ナイロンフィルム層、無機酸化物蒸着層を多層有するバリアフィルム層、無機酸化物蒸着層を多層有するバリアフィルム層、高密度ポリエチレンフィルム層、又は無機酸化物蒸着層を多層有するバリアフィルム層、無機酸化物蒸着層を多層有するバリアフィルム層、ナイロンフィルム層、高密度ポリエチレンフィルム層、からなる積層フィルムとからなり、前記高密度ポリエチレンフィルム層を内側とした包装袋に断熱性コア材を封入し内部を真空密封してなる真空断熱材。 Laminated film composed of polyethylene terephthalate film layer, nylon film layer, aluminum foil layer, high-density polyethylene film layer, barrier film layer having multilayer of nylon film layer, inorganic oxide vapor deposition layer, barrier film having multilayer of inorganic oxide vapor deposition layer Layer film, high-density polyethylene film layer, or barrier film layer having a multilayer of inorganic oxide vapor-deposited layer, barrier film layer having a multilayer of inorganic oxide vapor-deposited layer, nylon film layer, laminated film composed of high-density polyethylene film layer A vacuum heat insulating material obtained by enclosing a heat insulating core material in a packaging bag with the high density polyethylene film layer on the inside and vacuum-sealing the inside .
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