JP6594618B2 - 真空断熱材、断熱箱体及び冷蔵庫 - Google Patents
真空断熱材、断熱箱体及び冷蔵庫 Download PDFInfo
- Publication number
- JP6594618B2 JP6594618B2 JP2014229927A JP2014229927A JP6594618B2 JP 6594618 B2 JP6594618 B2 JP 6594618B2 JP 2014229927 A JP2014229927 A JP 2014229927A JP 2014229927 A JP2014229927 A JP 2014229927A JP 6594618 B2 JP6594618 B2 JP 6594618B2
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- Prior art keywords
- heat insulating
- vacuum heat
- insulating material
- sheet
- fiber
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/50—Properties of the layers or laminate having particular mechanical properties
- B32B2307/546—Flexural strength; Flexion stiffness
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/70—Other properties
- B32B2307/724—Permeability to gases, adsorption
- B32B2307/7242—Non-permeable
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2509/00—Household appliances
- B32B2509/10—Refrigerators or refrigerating equipment
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D2201/00—Insulation
- F25D2201/10—Insulation with respect to heat
- F25D2201/14—Insulation with respect to heat using subatmospheric pressure
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D23/00—General constructional features
- F25D23/06—Walls
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/23—Sheet including cover or casing
- Y10T428/231—Filled with gas other than air; or under vacuum
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
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- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Thermal Insulation (AREA)
- Refrigerator Housings (AREA)
- Laminated Bodies (AREA)
Description
−真空断熱材の構成−
図1(a)は、第1の実施形態に係る真空断熱材1を示す斜視図であり、(b)は、当該真空断熱材1の図1(a)に示すIb-Ib線における断面図である。図2(a)は、真空断熱材1の芯材5として用いられるシート7の表面を撮影した写真図であり、(b)は、集束無機繊維を含まない従来のシートの表面を撮影した写真図である。
xt=(L3/4bd3)・(Ft/E) ・・・式(1)
xt:繊維のたわみ量
L:繊維の長さ
b:繊維の幅=繊維径
d:繊維の高さ=繊維径
Ft:たわみxtに対応する荷重
E:曲げ弾性率(無機繊維材料のヤング率:同じ材料なら一定)
但し、無機繊維の平均長さが50mmを超える場合、繊維の変形が大きくなりすぎて無機繊維の集束量が多くなってしまい、集束無機繊維9の幅あるいは長さが大きくなって適切な範囲にすることが難しい。また、シート7製造時において湿式抄紙法用の設備に繊維が絡まりやすくなり、生産性が低下する。無機繊維の平均直径を3μm未満とした場合も同様であり、且つ無機繊維の製造コストが著しく高くなってしまうため、好ましくない。
次に、本実施形態の真空断熱材1の製造方法を説明する。以下では無機繊維としてガラス繊維を用いる例を示すが、セラミック繊維や炭素繊維等を用いた場合でも同様の方法で真空断熱材を製造することが可能である。また、以下で説明するのは真空断熱材1の製造方法の一例であり、製造方法はこの例に限定されるものではない。
本開示の第2の実施形態として、第1の実施形態に係る真空断熱材1を用いた冷蔵庫について説明する。図7は、本実施形態に係る冷蔵庫を示す断面図である。
<実施例1>
上述した第1の実施形態に係る真空断熱材の製造方法に従って真空断熱材を作製した。
実施例1と同様の方法で真空断熱材を作製した。芯材に用いられたシートに含まれるガラス繊維の平均繊維長は25mmであり、集束ガラス繊維の平均幅は0.56mm、集束ガラス繊維の平均長は44mmとなった。シートの単位面積当たりの集束ガラス繊維数は2820本/m2であった。シートの長手方向引張強度/幅方向引張強度の値は3.9であった。
実施例1と同様の方法で真空断熱材を作製した。芯材に用いられたシートに含まれるガラス繊維の平均繊維長は25mmであり、集束ガラス繊維の平均幅は0.56mm、集束ガラス繊維の平均長は44mmとなった。また、シートの平均目付量は25g/m2であり、芯材として用いられるシートの積層数は74枚とした。シートの単位面積当たりの集束ガラス繊維数は5870本/m2であった。シートの長手方向引張強度/幅方向引張強度の値は3.9であった。
実施例1と同様の方法で真空断熱材を作製した。芯材に用いられたシートに含まれるガラス繊維の平均繊維長は25mmであり、集束ガラス繊維の平均幅は0.76mm、集束ガラス繊維の平均長は47mmであった。また、シートの平均目付量は40g/m2であり、芯材として用いられるシートの積層数は42枚とした。シートの単位面積当たりの集束ガラス繊維数は6890本/m2であった。シートの長手方向引張強度/幅方向引張強度の値は3.8であった。
遠心法によって製造されたガラス繊維を集綿し(乾式法)、これにバインダを適量添加した上でプレス機を用いて加熱及び加圧して圧縮成形することで、ガラス繊維からなるシートを作製した。シートを作製する際に、シート中に集束ガラス繊維は生成されなかった。作製されたシートを構成するガラス繊維の平均繊維径は5μmであり、平均繊維長は測定できなかった。シートの平均目付量は1860g/m2であり、芯材として用いられるシートの積層数は1枚とした。
連続フィラメント法によって製造されたガラス繊維を用いて抄紙工程を行い、ガラス繊維からなるシートを作製した。比較例2で用いた繊維径及び繊維長のガラス繊維では、シート中に集束ガラス繊維は生成されなかった。また、上述の凝集剤を用いなかった。
連続フィラメント法によって製造されたガラス繊維を用いて抄紙工程を行い、ガラス繊維からなるシートを作製した。比較例3で用いた繊維径及び繊維長のガラス繊維では、シートを作製する際に、シート中に集束ガラス繊維は生成されなかった。
連続フィラメント法によって製造されたガラス繊維を用いて抄紙工程を行い、ガラス繊維からなるシートを作製した。比較例4で用いた繊維径及び繊維長のガラス繊維では、シートを作製する際に、シート中に集束ガラス繊維は生成されなかった。また、上述の凝集剤を用いなかった。
実施例1と同様の方法で真空断熱材を作製した。芯材に用いられたシートに含まれるガラス繊維の平均繊維長は6mmであり、集束ガラス繊維の平均幅は0.54mm、集束ガラス繊維の平均長は12mmであった。集束ガラス繊維同士の接触は見られなかった。また、シートの平均目付量は130g/m2であり、芯材として用いられるシートの積層数は15枚とした。1シートの面積当たりの集束ガラス繊維数は2500本/m2であった。シートの長手方向引張強度/幅方向引張強度の値は1.1であった。
<無機繊維(ガラス繊維)の平均繊維径及び平均繊維長の測定>
外被材に封入された後の芯材から5mm×5mmの四辺形状の部分を切り出し、走査型電子顕微鏡を用いて切り出された芯材を1500倍に拡大して観察した。任意に50本のガラス繊維を選択し、測定した繊維径の平均値を求めた。また、任意に選択した290mm×410mmの範囲の芯材から任意に50本のガラス繊維を選択し、選択されたガラス繊維の繊維長を、マイクロスコープによる測定、あるいは拡大鏡又は肉眼によりノギス等を用いて測定し、繊維長の平均値を求めた。
シートのうち、任意に選択した290mm×410mmの範囲に含まれる集束ガラス繊維の本数を目視によって数えた後、シートの単位面積及び単位体積当たりの本数を算出した。また、シートの上記範囲に含まれる集束ガラス繊維から任意の50本を選択して切り出し、まっすぐに伸ばして固定した状態で、その長さ、幅をノギス又は定規によって測定し、平均値を求めた。
シートのサイズを幅50mm×長さ300mmとして引張試験を実施した。試験条件はJIS L1913:2010に準拠し、6.3.1項の標準時に記載の条件に基づいて行った。つかみ間隔=200mm、試験温度及び湿度=23℃、湿度50%とし、引張速度=10mm/分とした。
真空断熱材の熱伝導率の測定は、真空断熱材のサイズを幅290mm、長さ410mm、厚さ7mmとして実施した。JISA 1412−2(熱流計法)に準拠する測定機として、NETZSCH社製HFM436を用いて行った。試験条件は、高温側38℃、低温側10℃(ΔT=28K)とした。なお、測定は真空断熱材作製後24時間以上経過後に行った。表1には、3例について測定した結果の平均値を示す。
真空断熱材のサイズを幅30mm×長さ120mm×厚さ7mmとして3点曲げ試験を実施した。試験条件はJIS K7221−2:2006に準拠した。圧子及び支持台の半径=15R、支点間距離=88mmとし、試験片は、23℃、湿度50%で88時間以上保存した後に試験に供され(JIS K7100:1999に準ずる)、試験温度及び湿度=23℃、湿度50%とし、曲げ速度=20mm/分とした。なお、曲げ強度は降伏点での力を最大の力として算出した。これは、真空断熱材に折れ目が発生(降伏点)した場合、これを基点として著しく折れ曲りやすくなってしまうという考え方に基づいたためである。
表1に示すように、本実施例1〜4に係る真空断熱材の熱伝導率は、1.17W/(m・K)×10−3〜1.34W/(m・K)×10−3の範囲であり、実施例1〜4に係る真空断熱材は、比較例1、4の真空断熱材に比べて良好な断熱性能を有していることが確認できた。
3 外被材
5 芯材
6 シール部
7 シート
9 集束無機繊維
11 分散媒
12、14、15 ローラ
13 ガラス繊維
17 シート
19 ベルト
21、31 内箱
29 発泡ウレタン
33 外箱
35、37 扉
39 機械室
40 断熱箱体
41 圧縮機
43 冷凍室
44、46 蒸発器
45 冷蔵室
Claims (10)
- ガスバリア性を有する袋状の外被材と、
複数の無機繊維を含む1枚のシート、又は複数枚の積層された前記シートで構成され、前記外被材の中に封入された芯材とを備え、前記外被材の内部が減圧された真空断熱材であって、
前記複数の無機繊維は、平均長さが20mm以上50mm以下、及び平均直径が3μm以上8μm以下であり、
前記シートは、前記複数の無機繊維のうち、一部の無機繊維同士が絡まって集束してなる集束無機繊維を1cm 3 あたりに換算して10本以上200本以下で含んでおり、
少なくとも一部の前記集束無機繊維同士は接触している真空断熱材。 - 前記集束無機繊維の幅は0.1mm以上2.0mm以下であり、前記集束無機繊維の長さは10mm以上100mm以下であることを特徴とする請求項1に記載の真空断熱材。
- 前記複数の無機繊維の少なくとも一部は、他の無機繊維と接触しており、一部の無機繊維の他の無機繊維との接触部分における延伸方向は、前記シートの厚さ方向成分を有していることを特徴とする請求項1又は2に記載の真空断熱材。
- 前記外被材に封入する前の前記シートの目付量の平均値は10g/m2以上200g/m2以下であることを特徴とする請求項1〜3のうちいずれか1つに記載の真空断熱材。
- 前記シートの平面方向における第1の方向と、前記第1の方向に直交する第2の方向のうち、引張強度が大きい方向を前記真空断熱材の長手方向とすることを特徴とする請求項1〜4のうちいずれか1つに記載の真空断熱材。
- 前記複数の無機繊維は、SiO2を50wt%以上60wt%以下、CaOを15wt%以上25wt%以下、MgOを0wt%以上6wt%以下、Al2O3を12wt%以上16wt%以下、B2O3を8wt%以上13wt%以下、K2Oを0wt%以上1wt%以下、Na2Oを0wt%以上1wt%以下含む(ただし、SiO2、CaO、MgO、Al2O3、B2O3、K2O及びNa2Oの含有率の総和は100wt%以下)ことを特徴とする請求項1〜5のうちいずれか1つに記載の真空断熱材。
- 前記複数の無機繊維は連続フィラメント法で製造されたガラス繊維であることを特徴とする請求項1〜6のうちいずれか1つに記載の真空断熱材。
- 前記ガラス繊維はEガラスで構成されていることを特徴とする請求項7に記載の真空断熱材。
- 外箱と、
前記外箱内に収納される内箱と、
前記外箱と前記内箱との間に配置され、請求項1〜8のうちいずれか1つに記載された真空断熱材とを備えている断熱箱体。 - 外箱と、
前記外箱内に収納される内箱と、
冷凍サイクルと、
前記外箱と前記内箱との間に配置された請求項1〜8のうちいずれか1つに記載された真空断熱材とを備えている冷蔵庫。
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JP5401258B2 (ja) * | 2009-10-26 | 2014-01-29 | 日立アプライアンス株式会社 | 冷蔵庫 |
JP5797482B2 (ja) * | 2011-07-08 | 2015-10-21 | 株式会社エフコンサルタント | 積層体 |
WO2013121992A1 (ja) * | 2012-02-14 | 2013-08-22 | 井前工業株式会社 | 真空断熱材及びその製造方法 |
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- 2014-11-12 JP JP2014229927A patent/JP6594618B2/ja active Active
- 2014-11-25 US US15/039,684 patent/US10137658B2/en active Active
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JP2016035320A (ja) | 2016-03-17 |
US10137658B2 (en) | 2018-11-27 |
KR102196200B1 (ko) | 2020-12-31 |
EP3076115B1 (en) | 2021-05-19 |
EP3076115A1 (en) | 2016-10-05 |
US20170001405A1 (en) | 2017-01-05 |
EP3076115A4 (en) | 2017-08-23 |
KR20150060582A (ko) | 2015-06-03 |
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