JP3913628B2

JP3913628B2 - Storage box

Info

Publication number: JP3913628B2
Application number: JP2002211696A
Authority: JP
Inventors: 一雄田島; 将博太根; 智義小野塚
Original assignee: Sekisui Kasei Co Ltd
Current assignee: Sekisui Kasei Co Ltd
Priority date: 2002-07-19
Filing date: 2002-07-19
Publication date: 2007-05-09
Anticipated expiration: 2022-07-19
Also published as: JP2004051166A

Description

【０００１】
【発明の属する技術分野】
本発明は、生鮮食料品等を収納して輸送する用途等に使用される優れた断熱性を有する収納箱に関する。
【０００２】
【従来の技術】
従来から、発泡体は断熱性に優れていることから保冷箱を形成するのに利用されている。上記保冷箱は、特開２０００−３４６５１４号公報に示したように、収納箱本体とこの収納箱本体の開口部を開閉自在に閉止する蓋体とから構成され、収納箱本体は、通常、スチレン系樹脂からなる予備発泡粒子を雌雄型間に形成されたキャビティ内に充填し、予備発泡粒子を発泡一体化させることによって形成されている。
【０００３】
従って、収納箱本体の表面には、予備発泡粒子同士の融着界面に起因する微細な溝が多数形成されており、この溝内に進入した汚れは、収納箱本体の表面を単に拭き取るだけでは容易に除去することができないといった問題点があった。
【０００４】
そこで、収納箱本体の表面全面に熱可塑性樹脂フィルムを積層一体化して収納箱本体の表面に形成された溝を全て被覆隠蔽し、収納箱本体の表面を平滑面に形成して汚れの除去を簡単にすることが考えられる。
【０００５】
しかしながら、上記のように、収納箱本体の表面全面に熱可塑性樹脂フィルムを積層一体化させると、熱可塑性樹脂フィルムは発泡体に比して熱伝導率が高いために、収納箱本体の外周面、即ち、外気に接触する部分に積層一体化された熱可塑性樹脂フィルムに加えられた熱が熱可塑性フィルムを伝導して収納箱本体の内周面に積層一体化させた熱可塑性樹脂フィルムに伝わり、収納箱本体内の空気の冷却効果、即ち、断熱性が低減してしまうといった問題点があった。
【０００６】
【発明が解決しようとする課題】
本発明は、優れた断熱性を有すると共に汚れの除去が簡単に行える収納箱を提供する。
【０００７】
【課題を解決する手段】
請求項１に記載の収納箱は、発泡体からなる収納箱本体とこの収納箱本体の開口部を開閉自在に閉止する発泡体からなる蓋体とから構成されていると共に、上記収納箱本体の内外面に熱可塑性樹脂フィルムを積層一体化してなる収納箱において、上記収納箱本体は、底部とこの底部の四方外周縁から上方に向かって突設された周壁部とからなり、この周壁部の上端部内周面には、断面Ｌ字状の周段部が形成されていると共に、この周段部の対向部分の下方における周壁部の内周面を上記周段部から連続して段状に切欠くことによって一対の保冷剤載置用段部が形成されており、上記周段部を除き且つ上記保冷剤載置用段部を含めた上記周壁部の内面に内側熱可塑性樹脂フィルムが積層一体化されている一方、上記蓋体の下面には、外周面が上記収納箱本体の周段部に摺接する枠状の係合部が突設されており、この係合部の外周面には熱可塑性樹脂フィルムが積層されておらず、上記収納箱本体の開口部を上記蓋体によって閉止する際に摺接する、上記収納箱本体の周段部と上記蓋体の係合部の外周面との接合部分を不連続部に形成しており、上記収納箱本体の内面に積層一体化させた上記熱可塑性樹脂フィルムの厚さが３０〜５０μｍであると共に、上記収納箱本体の外面に積層一体化させた上記熱可塑性樹脂フィルムの厚さが４０〜１５０μｍであることを特徴とする。
【０００８】
【作用】
本発明の収納箱は、その収納箱本体の内外面に熱可塑性樹脂フィルムを積層一体化していると共に、収納箱と蓋体との接合部分において、収納箱本体の開口部に沿って熱可塑性樹脂フィルムを積層させていない不連続部を形成していることから、収納箱本体の外面を被覆する外側熱可塑性樹脂フィルムと、収納箱本体の内面を被覆する内側熱可塑性樹脂フィルムとは、不連続部によって完全に分離した状態となっており、外側熱可塑性樹脂フィルムに加えられた熱が内側熱可塑性樹脂フィルムに伝導することはなく、収納箱内は外部の熱と完全に遮断されており、よって、本発明の収納箱は優れた断熱性を有する。
【０００９】
【発明の実施の形態】
本発明の収納箱の一例を図面を参照しつつ説明する。収納箱Ａの収納箱本体１は発泡体から形成され、図１乃至図３に示したように、平面横長長方形状の底部11と、この底部11の四方外周縁から上方に向かって突設された一定高さを有する周壁部12とからなり、上端部は全面的に開口した平面横長長方形状の開口部14が形成されている。なお、上記収納箱本体１を構成する発泡体としては、特に限定されず、例えば、スチレン系樹脂からなる予備発泡粒子を発泡させて予備発泡粒子同士を熱融着一体化させて得られるスチレン系樹脂発泡体やオレフィン系樹脂発泡体等が挙げられる。
【００１０】
そして、上記収納箱本体１の周壁部12の上端部内周面には、その全周に亘って一定の上下寸法を有する断面Ｌ字状の周段部13が周壁部12の上端面に開口した状態に形成されている。
【００１１】
更に、上記収納箱本体１の開口部14の対向する内周面、即ち、上記周段部13のの対向部分の下方の周壁部12の内周面を、長さが保冷剤Ｂの幅寸法に略合致し且つ上下寸法が保冷剤Ｂの厚さに略合致するように、周段部13から連続して段状に切欠きすることにより、一対の正面横長長方形状の保冷剤載置用段部15、15を形成しており、上記保冷剤載置用段部15は、上記周段部13の上面13a 及び収納箱本体１の内周面に開口した状態に上記周段部13の全幅に亘って凹設されている。
【００１２】
なお、上記保冷剤Ｂは、図１及び図３に示したように、長さが上記収納箱本体１の一対の保冷剤載置用段部15、15の対向面15a 、15a 間の間隔に合致し且つ略一定の厚みを有する板状体に形成され、内部には液体状の保冷薬剤が収納されている。
【００１３】
そして、上記のように構成された収納箱本体１の外面全面、即ち、収納箱本体１の底部11の外面全面及び周壁部12の外面全面には一定厚みを有する熱可塑性樹脂フィルム２が積層一体化されている。なお、図２では、上記外側熱可塑性樹脂フィルム２の上端21と上記収納箱本体１の周壁部12の上端外周縁12a との間に僅かな上下寸法を有する隙間12b を形成しているが、上記外側熱可塑性樹脂フィルム２の上端21を上記周壁部12の上端外周縁12a に合致させてもよい。
【００１４】
更に、図２に示したように、上記収納箱本体１の内面における周段部13（上面13a 及び側面13b ）を除いた全面、即ち、収納箱本体１の底部11の内面全面並びに周壁部12内面における周段部13の上面13a 及び側面13b を除いた全面には、内側熱可塑性樹脂フィルム３が積層一体化されている。なお、図２では、上記内側熱可塑性樹脂フィルム３の上端31と上記収納箱本体１の周段部13の上面内周縁13c との間に僅かな上下寸法を有する隙間12e を形成しているが、上記内側熱可塑性樹脂フィルム３の上端31を上記周段部13の上面内周縁13c に合致させてもよい。
【００１５】
そして、上記収納箱本体１の表面における上記外側熱可塑性樹脂フィルム２の上端21と上記内側熱可塑性樹脂フィルム３の上端31との間には、熱可塑性樹脂フィルムは全く積層されておらず、上記収納箱本体１の開口部14に沿って、収納箱本体１の発泡体が露出した枠状の不連続部10が形成されている。
【００１６】
なお、上記内外熱可塑性樹脂フィルム３、２は、上記収納箱本体１を構成する樹脂と熱融着性を有しておれば、特に限定されず、例えば、ポリスチレン、ハイインパクトポリスチレン等のスチレン系樹脂、オレフィン系樹脂等が挙げられ、スチレン系樹脂が好ましい。なお、熱可塑性樹脂フィルム２、３には紫外線吸収剤や酸化防止剤を添加してもよい。
【００１７】
又、外側熱可塑性樹脂フィルム２の厚さは、厚いと、収納箱Ａの軽量性が低下し、又、薄いと、収納箱本体１の機械的強度が低下するので、４０〜１５０μｍに限定される。
【００１８】
更に、内側熱可塑性樹脂フィルム３の厚さは、厚いと、内側熱可塑性樹脂フィルム３の冷却に保冷剤Ｂの冷却能力が奪われて、収納箱Ａ内の保冷性が低下し、又、薄いと、収納箱本体１の機械的強度が低下するので、３０〜５０μｍに限定される。
【００１９】
又、上記収納箱本体１の開口部14は、発泡体からなる蓋体４によって開閉自在に閉止されるが、この蓋体４は、上記収納箱本体１の周壁部12の上端外周形状に合致した同一形状、同一大きさの平面縦長長方形状に形成され、上記蓋体４の下面には、外周形状が上記収納箱本体１の周段部13の上面13a 外周形状に合致し且つ高さが上記収納箱本体１における周段部13の側面13b の上下高さに合致した平面四角枠状の係合部41が突設されている。なお、上記蓋体４としては、特に限定されず、例えば、スチレン系樹脂からなる予備発泡粒子を発泡させて予備発泡粒子同士を熱融着一体化させて得られるスチレン系樹脂発泡体やオレフィン系樹脂発泡体等が挙げられる。
【００２０】
そして、上記蓋体４の下面における係合部41で囲まれた部分40の全面及び係合部41の内周面41a の全面には、上記内外熱可塑性樹脂フィルム３、２と同様の熱可塑性樹脂からなる熱可塑性樹脂フィルム５が積層一体化されている。なお、図４に示したように、上記蓋体４の係合部41の下面41b 全面にも熱可塑性樹脂フィルム５を積層一体化させてもよい。
【００２１】
上記熱可塑性樹脂フィルム５の厚さは、厚いと、熱可塑性樹脂フィルム５に保冷剤の冷却能力が奪われて、収納箱Ａ内の保冷性が低下することがあり、又、薄いと、蓋体４の機械的強度が低下することがあるので、３０〜５０μｍが好ましい。
【００２２】
更に、上記蓋体４の外面全面、即ち、蓋体４の上面4a及び外周面4bの全面にも上記内外熱可塑性樹脂フィルム３、２と同様の熱可塑性樹脂からなる熱可塑性樹脂フィルム６が積層一体化されている。図２では、上記熱可塑性樹脂フィルム６の下端61と上記蓋体４の下端外周縁43との間に僅かな上下寸法を有する隙間44を形成しているが、上記熱可塑性樹脂フィルム６の下端61を上記蓋体４の下端外周縁43に合致させてもよく、又、図４に示したように、上記蓋体４の下面における係合部41の外方にある平面四角枠状の外周部42の全面にも上記熱可塑性樹脂フィルム６を積層一体化させてもよい。
【００２３】
そして、上記蓋体４を上記収納箱本体１の開口部14に開閉自在に閉止させた状態では、図５に示したように、上記蓋体４の係合部41の下面41b 及び外周面41cが上記収納箱本体１の周段部13の上面13a 及び側面13b に密接していると共に、上記蓋体４の外周部42が上記収納箱本体１の周壁部12の上端面12d に密接した状態となるように構成されている。
【００２４】
次に、上記収納箱Ａの使用要領について説明する。先ず、上記収納箱本体１内に、保冷を要する収納物（図示せず）を収納した上で、上記保冷剤Ｂをその長さ方向の両端部を一対の保冷剤載置用段部15、15の上面15b 、15b 上に載置して、上記保冷剤Ｂを一対の保冷剤載置用段部15、15間に掛け渡した状態に配設し、しかる後、上記収納箱Ａの開口部14を上記蓋体４によって開閉自在に閉止する（図３参照）。
【００２５】
この状態では、上記保冷剤Ｂの両端部が、各保冷剤載置用段部15の上面15b 及び周壁面15a 、15c 、15c を全面的に被覆している内側熱可塑性樹脂フィルム３に接触した状態となっている。
【００２６】
従って、上記保冷剤Ｂは、その両端部における内側熱可塑性樹脂フィルム３との接触部分を通じて上記内側熱可塑性樹脂フィルム３を短時間のうちに全面的に直接、冷却し、しかも、上記内側熱可塑性樹脂フィルム３は、上記収納箱本体１の開口部14を上記蓋体４で閉止した状態では、上記収納箱本体１の内面の略全面に積層一体化されていることから、上記保冷剤Ｂの保冷力は、上記内側熱可塑性樹脂フィルム３によって上記収納箱本体１内の全体に円滑に伝えられ、よって、上記収納箱本体１内は上記保冷剤Ｂによって短時間のうちに効果的に冷却される。
【００２７】
しかも、上記収納箱本体１の不連続部10又はこの不連続部10の一部は、上記周段部13の側面13a によって形成される一方、上記蓋体４の係合部41の外周面41c
は、熱可塑性樹脂フィルムは積層されずに上記蓋体４の発泡体が露出した状態となっている。
【００２８】
従って、上記収納箱本体１の開口部14を上記蓋体４によって閉止した状態において、上記収納箱本体１の不連続部10又はこの不連続部10の一部を構成する周段部13の側面13b と上記蓋体４の係合部41の外周面41c とが接合する部分は、露出した発泡体同士が互いに密着した状態となっており、この発泡体同士が密着した接合部によって上記収納箱本体１の内外が完全に遮断された状態となっており、閉止状態の収納箱本体１内は優れた保冷性（断熱性）を有する。
【００２９】
又、上記収納箱Ａの収納箱本体１の開口部14を上記蓋体４によって開閉する場合には、上記蓋体４の係合部41を、その外周面41c が上記収納箱本体１の周段部13の側面13b に上下方向に摺接した状態に、上記収納箱本体１の周段部13内に下方に向かって押し込み或いは上方に向かって引き上げる。
【００３０】
しかるに、上記収納箱Ａでは、その収納箱本体１の周段部13の側面13b 及び蓋体４の係合部41の外周面41c の双方に熱可塑性樹脂フィルムが全く積層されていないことから、上記収納箱本体１の開口部14を上記蓋体４により開閉する際、上記収納箱本体１の周段部13の側面13b と上記蓋体４の係合部41の外周面41c との間の摺接摩擦によって熱可塑性樹脂フィルムが剥がれて収納箱Ａの断熱性能が低下するといったことはなく、収納箱Ａの断熱性能を長期間に亘って確実に維持することができる。
【００３１】
【発明の効果】
請求項１に記載の収納箱は、発泡体からなる収納箱本体とこの収納箱本体の開口部を開閉自在に閉止する発泡体からなる蓋体とから構成されていると共に、上記収納箱本体の内外面に熱可塑性樹脂フィルムを積層一体化してなる収納箱において、上記収納箱本体は、底部とこの底部の四方外周縁から上方に向かって突設された周壁部とからなり、この周壁部の上端部内周面には、断面Ｌ字状の周段部が形成されていると共に、この周段部の対向部分の下方における周壁部の内周面を上記周段部から連続して段状に切欠くことによって一対の保冷剤載置用段部が形成されており、上記周段部を除き且つ上記保冷剤載置用段部を含めた上記周壁部の内面に内側熱可塑性樹脂フィルムが積層一体化されている一方、上記蓋体の下面には、外周面が上記収納箱本体の周段部に摺接する枠状の係合部が突設されており、この係合部の外周面には熱可塑性樹脂フィルムが積層されておらず、上記収納箱本体の開口部を上記蓋体によって閉止する際に摺接する、上記収納箱本体の周段部と上記蓋体の係合部の外周面との接合部分を不連続部に形成しており、上記収納箱本体の内面に積層一体化させた上記熱可塑性樹脂フィルムの厚さが３０〜５０μｍであると共に、上記収納箱本体の外面に積層一体化させた上記熱可塑性樹脂フィルムの厚さが４０〜１５０μｍであることを特徴とするので、収納箱本体の外面に積層一体化させた熱可塑性樹脂フィルムに加えられた熱が、収納箱本体の内面に積層一体化させた熱可塑性樹脂フィルムに伝導されることはなく、よって、収納箱は、外気温にかかわらず優れた断熱性を有する。
【００３２】
又、上記収納箱は、収納箱本体の開口部を蓋体によって開閉自在に閉止する際に収納箱本体と蓋体とが摺接する部分に不連続部を形成していることを特徴とするので、収納箱本体の熱可塑性樹脂フィルムが蓋体との摺接摩擦によって収納箱本体の表面から剥離したりすることはなく、よって、収納箱は、長期間に亘って優れた断熱性を保持する。
【００３３】
そして、上記収納箱は、収納箱本体の開口部の対向する内周面に一対の保冷剤載置用段部が形成され、上記収納箱本体における上記保冷剤載置用段部を含めた内面に熱可塑性樹脂フィルムが積層一体化されていることを特徴とするので、保冷剤載置用段部上に載置した保冷剤によって、収納箱本体の内面に積層一体化させた熱可塑性樹脂フィルムを直接、全面的に冷却することができ、この冷却した熱可塑性樹脂フィルムによって収納箱本体内を確実に冷却して収納箱の保冷性能を向上させることができる。
【図面の簡単な説明】
【図１】本発明の収納箱を示した斜視図である。
【図２】図１の収納箱の縦断面図である。
【図３】図１の収納箱の縦断面図である。
【図４】蓋体の他の一例を示した縦断面図である。
【図５】図１の収納箱の縦断面図である。
【符号の説明】
１収納箱本体
10 不連続部
13 周段部
14 開口部
15 保冷剤載置用段部
２外側熱可塑性樹脂フィルム
３内側熱可塑性樹脂フィルム
４蓋体
５、６熱可塑性樹脂フィルム[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a storage box having excellent heat insulation used for storing and transporting fresh food products and the like.
[0002]
[Prior art]
Conventionally, foams have been used to form cold storage boxes because of their excellent heat insulation properties. As shown in Japanese Patent Laid-Open No. 2000-346514, the cold box is composed of a storage box body and a lid that can open and close the opening of the storage box body. The storage box body is usually made of styrene. It is formed by filling pre-expanded particles made of a system resin into a cavity formed between a male and female mold and foaming and integrating the pre-expanded particles.
[0003]
Therefore, the surface of the storage box body has many fine grooves due to the fusion interface between the pre-expanded particles, and the dirt that has entered the grooves can be simply wiped off the surface of the storage box body. There was a problem that it could not be removed easily.
[0004]
Therefore, a thermoplastic resin film is laminated and integrated on the entire surface of the storage box body to cover and hide all the grooves formed on the surface of the storage box body, and the surface of the storage box body is formed on a smooth surface to remove dirt. It can be simplified.
[0005]
However, as described above, when a thermoplastic resin film is laminated and integrated on the entire surface of the storage box body, the thermoplastic resin film has a higher thermal conductivity than that of the foam. That is, the heat applied to the thermoplastic resin film laminated and integrated with the portion in contact with the outside air is conducted through the thermoplastic film and transferred to the thermoplastic resin film laminated and integrated on the inner peripheral surface of the storage box body. There is a problem that the cooling effect of the air in the storage box body, that is, the heat insulation is reduced.
[0006]
[Problems to be solved by the invention]
The present invention provides a storage box that has excellent heat insulating properties and can easily remove dirt.
[0007]
[Means for solving the problems]
The storage box according to claim 1 is composed of a storage box main body made of a foam and a lid made of a foam for closing the opening of the storage box main body so as to be openable and closable. In the storage box in which the thermoplastic resin films are laminated and integrated on the inner and outer surfaces, the storage box body includes a bottom portion and a peripheral wall portion projecting upward from the four-side outer periphery of the bottom portion. A circumferential step portion having an L-shaped cross section is formed on the inner peripheral surface of the upper end portion, and the inner peripheral surface of the peripheral wall portion below the facing portion of the peripheral step portion is continuously stepped from the peripheral step portion. A pair of cooling agent placement step portions are formed by notching, and an inner thermoplastic resin film is laminated on the inner surface of the peripheral wall portion excluding the circumferential step portion and including the cooling agent placement step portion. On the other hand, the outer peripheral surface is A frame-like engagement portion that is in sliding contact with the circumferential step portion of the storage box main body is projected, and the thermoplastic resin film is not laminated on the outer peripheral surface of the engagement portion. The joint portion between the circumferential step portion of the storage box body and the outer peripheral surface of the engagement portion of the lid body, which is in sliding contact with the lid body when the lid is closed, is formed as a discontinuous portion. The thickness of the thermoplastic resin film laminated and integrated on the inner surface is 30 to 50 μm, and the thickness of the thermoplastic resin film laminated and integrated on the outer surface of the storage box body is 40 to 150 μm. It is characterized by .
[0008]
[Action]
In the storage box of the present invention, a thermoplastic resin film is laminated and integrated on the inner and outer surfaces of the storage box body, and the thermoplastic resin is formed along the opening of the storage box body at a joint portion between the storage box and the lid. Since the discontinuous part where the film is not laminated is formed, the outer thermoplastic film covering the outer surface of the storage box body and the inner thermoplastic resin film covering the inner surface of the storage box body are discontinuous. It is in a state of being completely separated by the part, the heat applied to the outer thermoplastic resin film is not conducted to the inner thermoplastic resin film, the inside of the storage box is completely shielded from the external heat, Therefore, the storage box of the present invention has excellent heat insulating properties.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
An example of the storage box of the present invention will be described with reference to the drawings. The storage box main body 1 of the storage box A is formed of a foam, and as shown in FIGS. 1 to 3, the bottom 11 has a flat horizontally long rectangular shape, and protrudes upward from the four-side outer periphery of the bottom 11. In addition, an opening 14 in the form of a horizontally long rectangular plane is formed on the entire upper end of the peripheral wall 12 having a certain height. In addition, it does not specifically limit as a foam which comprises the said storage box main body 1, For example, the styrene type | system | group obtained by foaming the pre-expanded particle which consists of styrene-type resin, and carrying out heat-fusion integration of the pre-expanded particles mutually Examples thereof include resin foams and olefin resin foams.
[0010]
Further, on the inner peripheral surface of the upper end portion of the peripheral wall portion 12 of the storage box body 1, an L-shaped peripheral step portion 13 having a constant vertical dimension is opened on the upper end surface of the peripheral wall portion 12 over the entire periphery. It is formed in a state.
[0011]
Furthermore, the inner peripheral surface of the storage box body 1 facing the opening 14, that is, the inner peripheral surface of the peripheral wall portion 12 below the facing portion of the peripheral step portion 13, has a length that is the width dimension of the cooling agent B. And a pair of front side oblong rectangular shaped coolants by placing them in a step-like notch continuously from the circumferential step 13 so that the vertical dimension substantially matches the thickness of the coolant B. Steps 15 and 15 are formed, and the cryogen-retaining step 15 is open to the upper surface 13 a of the peripheral step 13 and the inner peripheral surface of the storage box body 1. It is recessed over the entire width.
[0012]
As shown in FIGS. 1 and 3, the cold insulation agent B has a length between the opposing surfaces 15 a and 15 a of the pair of cold insulation agent loading steps 15 and 15 of the storage box body 1. It is formed into a plate-like body that matches and has a substantially constant thickness, and contains a liquid cold-retaining agent inside.
[0013]
A thermoplastic resin film 2 having a certain thickness is laminated and integrated on the entire outer surface of the storage box body 1 configured as described above, that is, on the entire outer surface of the bottom 11 and the entire outer surface of the peripheral wall 12. It has become. In FIG. 2, a gap 12b having a slight vertical dimension is formed between the upper end 21 of the outer thermoplastic resin film 2 and the upper outer periphery 12a of the peripheral wall 12 of the storage box body 1. The upper end 21 of the outer thermoplastic resin film 2 may be aligned with the upper outer periphery 12a of the peripheral wall portion 12.
[0014]
Further, as shown in FIG. 2, the entire surface of the inner surface of the storage box body 1 excluding the peripheral step 13 (upper surface 13a and side surface 13b), that is, the entire inner surface of the bottom 11 of the storage box body 1 and the peripheral wall 12 The inner thermoplastic resin film 3 is laminated and integrated on the entire surface of the inner surface excluding the upper surface 13a and the side surface 13b of the circumferential step portion 13. In FIG. 2, a gap 12e having a slight vertical dimension is formed between the upper end 31 of the inner thermoplastic resin film 3 and the upper inner peripheral edge 13c of the peripheral step 13 of the storage box body 1. The upper end 31 of the inner thermoplastic resin film 3 may be aligned with the inner peripheral edge 13c of the upper surface of the peripheral step portion 13.
[0015]
The thermoplastic resin film is not laminated at all between the upper end 21 of the outer thermoplastic resin film 2 and the upper end 31 of the inner thermoplastic resin film 3 on the surface of the storage box body 1. A frame-like discontinuous portion 10 in which the foam of the storage box body 1 is exposed is formed along the opening 14 of the storage box body 1.
[0016]
The inner and outer thermoplastic resin films 3 and 2 are not particularly limited as long as the inner and outer thermoplastic resin films 3 and 2 have heat-fusibility with the resin constituting the storage box body 1. For example, styrene-based materials such as polystyrene and high impact polystyrene are used. Examples thereof include resins and olefin resins, and styrene resins are preferable. Note that an ultraviolet absorber or an antioxidant may be added to the thermoplastic resin films 2 and 3.
[0017]
The thickness of the outer thermoplastic resin film 2, when a thick, light weight storage box A is reduced, and, if thin, the mechanical strength of the containing box body 1 is reduced, limited to 40~150μm The
[0018]
Further, the thickness of the inner thermoplastic resin film 3, the thick, and the cooling capacity of the cold agent B is absorbed by the cooling of the inner thermoplastic resin film 3, and reduced cold resistance in storage box A, also thin Then, since the mechanical strength of the storage box body 1 is lowered , it is limited to 30 to 50 μm .
[0019]
The opening 14 of the storage box main body 1 is closed by a lid 4 made of a foam so as to be freely opened and closed. The lid 4 matches the outer peripheral shape of the upper end of the peripheral wall 12 of the storage box main body 1. The same shape and the same size in the shape of a vertically elongated rectangular shape, and the lower surface of the lid 4 has an outer peripheral shape that matches the outer peripheral shape of the upper surface 13a of the peripheral step 13 of the storage box body 1 and has a height. An engaging portion 41 having a flat rectangular frame shape is provided so as to match the vertical height of the side surface 13b of the circumferential step portion 13 in the storage box body 1. The lid 4 is not particularly limited, and for example, a styrene resin foam or an olefin resin obtained by foaming pre-expanded particles made of styrene resin and fusing the pre-expanded particles together. Resin foam etc. are mentioned.
[0020]
The entire surface of the portion 40 surrounded by the engaging portion 41 on the lower surface of the lid 4 and the entire inner peripheral surface 41a of the engaging portion 41 have the same thermoplasticity as the inner and outer thermoplastic resin films 3 and 2. A thermoplastic resin film 5 made of resin is laminated and integrated. As shown in FIG. 4 , the thermoplastic resin film 5 may be laminated and integrated over the entire lower surface 41 b of the engaging portion 41 of the lid 4.
[0021]
If the thickness of the thermoplastic resin film 5 is large, the thermoplastic resin film 5 may be deprived of the cooling capacity of the cold-retaining agent, and the cold-retaining property in the storage box A may be reduced. Since the mechanical strength of the body 4 may be lowered, 30 to 50 μm is preferable.
[0022]
Further, a thermoplastic resin film 6 made of the same thermoplastic resin as the inner and outer thermoplastic resin films 3 and 2 is laminated on the entire outer surface of the lid 4, that is, the entire upper surface 4 a and outer peripheral surface 4 b of the lid 4. It is integrated. In FIG. 2, a gap 44 having a slight vertical dimension is formed between the lower end 61 of the thermoplastic resin film 6 and the lower peripheral edge 43 of the lid 4, but the lower end of the thermoplastic resin film 6. 61 may be aligned with the outer peripheral edge 43 at the lower end of the lid 4, and as shown in FIG. 4 , the outer periphery of the flat rectangular frame shape outside the engaging portion 41 on the lower surface of the lid 4. The thermoplastic resin film 6 may be laminated and integrated on the entire surface of the portion 42.
[0023]
In the state in which the lid 4 is closed to the opening 14 of the storage box body 1 so as to be freely opened and closed, as shown in FIG. 5 , the lower surface 41b and the outer peripheral surface 41c of the engaging portion 41 of the lid 4 are provided. Is in close contact with the upper surface 13a and the side surface 13b of the peripheral step portion 13 of the storage box body 1, and the outer peripheral portion 42 of the lid body 4 is in close contact with the upper end surface 12d of the peripheral wall portion 12 of the storage box main body 1. It is comprised so that.
[0024]
Next, how to use the storage box A will be described. First, in the storage box main body 1, a storage item (not shown) that needs to be kept cool is stored, and then the cold-reserving agent B is placed at both ends in the length direction at a pair of cooling-reagent mounting steps 15, 15 is placed on the upper surfaces 15b, 15b of the 15 and the cold-retaining agent B is arranged in a state of being spanned between the pair of cold-reserving-agent placing steps 15, 15, and then the opening of the storage box A is opened. The portion 14 is closed by the lid 4 so as to be freely opened and closed (see FIG. 3).
[0025]
In this state, both end portions of the cooling agent B are in contact with the inner thermoplastic resin film 3 covering the entire upper surface 15b and the peripheral wall surfaces 15a, 15c, 15c of each cooling agent placement step 15. It is in a state.
[0026]
Therefore, the cold-retaining agent B directly cools the inner thermoplastic resin film 3 in a short time through contact portions with the inner thermoplastic resin film 3 at both ends, and further, the inner thermoplastic resin. Since the resin film 3 is laminated and integrated on substantially the entire inner surface of the storage box body 1 in the state where the opening 14 of the storage box body 1 is closed by the lid body 4, The cold insulation force is smoothly transmitted to the entire inside of the storage box body 1 by the inner thermoplastic resin film 3, so that the inside of the storage box body 1 is effectively cooled in a short time by the cold insulation agent B. The
[0027]
Moreover, the discontinuous portion 10 of the storage box body 1 or a part of the discontinuous portion 10 is formed by the side surface 13a of the peripheral step portion 13, while the outer peripheral surface 41c of the engaging portion 41 of the lid 4 is provided.
The thermoplastic resin film is not laminated and the foamed body of the lid 4 is exposed.
[0028]
Therefore, in the state where the opening 14 of the storage box body 1 is closed by the lid body 4, the side surface of the discontinuous portion 10 constituting the discontinuous portion 10 of the storage box main body 1 or a part of the discontinuous portion 10. The portion where 13b and the outer peripheral surface 41c of the engaging portion 41 of the lid 4 are joined is in a state where the exposed foams are in close contact with each other, and the storage box is formed by the joint where the foams are in close contact with each other. The inside and outside of the main body 1 are completely blocked, and the inside of the closed storage box main body 1 has excellent cold insulation (heat insulation).
[0029]
Further, when the opening 14 of the storage box body 1 of the storage box A is opened and closed by the lid body 4, the engaging portion 41 of the lid body 4 has an outer peripheral surface 41 c of the periphery of the storage box body 1. In a state in which the side surface 13b of the step portion 13 is slidably contacted in the vertical direction, it is pushed downward into the peripheral step portion 13 of the storage box body 1 or pulled upward.
[0030]
However, in the storage box A, the thermoplastic resin film is not laminated at all on both the side surface 13b of the peripheral step portion 13 of the storage box body 1 and the outer peripheral surface 41c of the engaging portion 41 of the lid 4. When the opening 14 of the storage box body 1 is opened and closed by the lid body 4, the gap between the side surface 13 b of the circumferential step portion 13 of the storage box body 1 and the outer peripheral surface 41 c of the engagement portion 41 of the lid body 4 is. The thermoplastic resin film is not peeled off due to sliding contact friction and the heat insulation performance of the storage box A is not lowered, and the heat insulation performance of the storage box A can be reliably maintained for a long period of time.
[0031]
【The invention's effect】
The storage box according to claim 1 is composed of a storage box main body made of a foam and a lid made of a foam for closing the opening of the storage box main body so as to be openable and closable. In the storage box in which the thermoplastic resin films are laminated and integrated on the inner and outer surfaces, the storage box body includes a bottom portion and a peripheral wall portion projecting upward from the four-side outer periphery of the bottom portion. A circumferential step portion having an L-shaped cross section is formed on the inner peripheral surface of the upper end portion, and the inner peripheral surface of the peripheral wall portion below the facing portion of the peripheral step portion is continuously stepped from the peripheral step portion. A pair of cooling agent placement step portions are formed by notching, and an inner thermoplastic resin film is laminated on the inner surface of the peripheral wall portion excluding the circumferential step portion and including the cooling agent placement step portion. On the other hand, the outer peripheral surface is A frame-like engagement portion that is in sliding contact with the circumferential step portion of the storage box main body is projected, and the thermoplastic resin film is not laminated on the outer peripheral surface of the engagement portion. The joint portion between the circumferential step portion of the storage box body and the outer peripheral surface of the engagement portion of the lid body, which is in sliding contact with the lid body when the lid is closed, is formed as a discontinuous portion. The thickness of the thermoplastic resin film laminated and integrated on the inner surface is 30 to 50 μm, and the thickness of the thermoplastic resin film laminated and integrated on the outer surface of the storage box body is 40 to 150 μm. because characterized, heat applied to the thermoplastic resin film is integrally laminated on the outer surface of the containing box body is not to be conducted to the thermoplastic resin film is integrally laminated on the inner surface of the containing box body Therefore, the storage box can be used regardless of the outside temperature. Having thermal insulation properties.
[0032]
Further, the storage box is characterized in that a discontinuous portion is formed in a portion where the storage box body and the lid are slidably contacted when the opening of the storage box body is opened and closed by the lid. The thermoplastic resin film of the storage box main body is not peeled off from the surface of the storage box main body due to sliding contact friction with the lid, and thus the storage box retains excellent heat insulation for a long period of time. .
[0033]
The storage box has a pair of cooling agent placement stepped portions formed on opposing inner peripheral surfaces of the opening portion of the storage box main body, and an inner surface including the cooling agent placement stepped portion in the storage box main body. Since the thermoplastic resin film is laminated and integrated, the thermoplastic resin film laminated and integrated on the inner surface of the storage box main body with the cooling agent placed on the step for placing the cooling agent. The inside of the storage box main body can be reliably cooled by the cooled thermoplastic resin film to improve the cooling performance of the storage box.
[Brief description of the drawings]
FIG. 1 is a perspective view showing a storage box of the present invention.
FIG. 2 is a longitudinal sectional view of the storage box of FIG.
FIG. 3 is a longitudinal sectional view of the storage box of FIG. 1;
FIG. 4 is a longitudinal sectional view showing another example of a lid.
FIG. 5 is a longitudinal sectional view of the storage box of FIG. 1;
[Explanation of symbols]
1 Storage box body
10 Discontinuity
13 Round section
14 opening
15 Step part for placing a cooling agent 2 Outer thermoplastic resin film 3 Inner thermoplastic resin film 4 Lid 5, 6 Thermoplastic resin film

Claims

発泡体からなる収納箱本体とこの収納箱本体の開口部を開閉自在に閉止する発泡体からなる蓋体とから構成されていると共に、上記収納箱本体の内外面に熱可塑性樹脂フィルムを積層一体化してなる収納箱において、上記収納箱本体は、底部とこの底部の四方外周縁から上方に向かって突設された周壁部とからなり、この周壁部の上端部内周面には、断面Ｌ字状の周段部が形成されていると共に、この周段部の対向部分の下方における周壁部の内周面を上記周段部から連続して段状に切欠くことによって一対の保冷剤載置用段部が形成されており、上記周段部を除き且つ上記保冷剤載置用段部を含めた上記周壁部の内面に内側熱可塑性樹脂フィルムが積層一体化されている一方、上記蓋体の下面には、外周面が上記収納箱本体の周段部に摺接する枠状の係合部が突設されており、この係合部の外周面には熱可塑性樹脂フィルムが積層されておらず、上記収納箱本体の開口部を上記蓋体によって閉止する際に摺接する、上記収納箱本体の周段部と上記蓋体の係合部の外周面との接合部分を不連続部に形成しており、上記収納箱本体の内面に積層一体化させた上記熱可塑性樹脂フィルムの厚さが３０〜５０μｍであると共に、上記収納箱本体の外面に積層一体化させた上記熱可塑性樹脂フィルムの厚さが４０〜１５０μｍであることを特徴とする収納箱。 It is composed of a storage box body made of foam and a lid body made of foam that closes the opening of the storage box body so that it can be opened and closed, and a thermoplastic resin film is laminated and integrated on the inner and outer surfaces of the storage box body. In the storage box formed, the storage box body is composed of a bottom portion and a peripheral wall portion protruding upward from the four-side outer peripheral edge of the bottom portion. A pair of cooling agents are formed by forming an inner peripheral surface of the peripheral wall portion below the opposed portion of the peripheral step portion into a step shape continuously from the peripheral step portion. On the other hand, an inner thermoplastic resin film is laminated and integrated on the inner surface of the peripheral wall portion excluding the peripheral step portion and including the stepped portion for placing the cooling agent. The lower surface of the outer peripheral surface is in sliding contact with the peripheral step of the storage box body. A frame-shaped engaging portion is projected, and a thermoplastic resin film is not laminated on the outer peripheral surface of the engaging portion, and the opening of the storage box body is closed by the lid. The thermal contact is formed in a discontinuous portion where the peripheral step portion of the storage box main body and the outer peripheral surface of the engaging portion of the lid body are formed in a discontinuous portion, and is laminated and integrated on the inner surface of the storage box main body. A storage box, wherein the thickness of the thermoplastic resin film is 30 to 50 μm, and the thickness of the thermoplastic resin film laminated and integrated on the outer surface of the storage box body is 40 to 150 μm.