JP3684322B2 - Foam gas recovery method for foam insulation - Google Patents

Foam gas recovery method for foam insulation Download PDF

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Publication number
JP3684322B2
JP3684322B2 JP2000081783A JP2000081783A JP3684322B2 JP 3684322 B2 JP3684322 B2 JP 3684322B2 JP 2000081783 A JP2000081783 A JP 2000081783A JP 2000081783 A JP2000081783 A JP 2000081783A JP 3684322 B2 JP3684322 B2 JP 3684322B2
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Japan
Prior art keywords
foam
crushing
gas
foam insulation
gas recovery
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JP2000081783A
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JP2000308876A (en
Inventor
徳明 原
義之 高村
幹治 藤森
博信 上田
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Hitachi Ltd
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Hitachi Ltd
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    • 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/50—Reuse, recycling or recovery technologies
    • Y02W30/52—Mechanical processing of waste for the recovery of materials, e.g. crushing, shredding, separation or disassembly
    • 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/50—Reuse, recycling or recovery technologies
    • Y02W30/62—Plastics recycling; Rubber recycling

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  • Processing Of Solid Wastes (AREA)
  • Disintegrating Or Milling (AREA)
  • Separation, Recovery Or Treatment Of Waste Materials Containing Plastics (AREA)

Description

【０００１】
【産業上の利用分野】
本発明は、廃棄処分される冷蔵庫等の廃冷却装置に用いられた不要な発泡断熱材の処理方法及び処理装置に関し、特に発泡断熱材から発泡ガスを脱気して回収する方法に関するものである。
【０００２】
【従来の技術】
従来、公知例として発泡断熱材から発泡ガスを回収する装置（例えば、特開平６−１８４３４８号公報）があるが、回収対象とする発泡ガスはフロンガスのような可燃性及び／又は爆発性を有さないガスである。一方、発泡ガスとしてフロンガスの代わりに用いられ始めたシクロペンタンガスは可燃性及び／又は爆発性があり、このような可燃性及び／又は爆発性を有する発泡ガスを、従来の発泡ガス回収装置により処理すれば爆発等の危険がともなう。
【０００３】
【発明が解決しようとする課題】
シクロペンタンガスのような可燃性及び／又は爆発性を有する発泡ガスはほとんど使用されてなかったため、従来の発泡ガス回収装置では可燃性及び爆発性を有する発泡ガス対策は何等配慮されていない。
【０００４】
本発明は回収システム全体を対象としており、解決しようとしている課題は冷却装置を破砕、分離する際に可燃及び爆発を防止し、安全に発泡ガスを回収するシステムに関するものであり、破砕前に可燃性及び爆発性を有する発泡ガスを含有した冷却装置か調査すること無く、可燃性及び爆発性を有する発泡ガスを含有していない冷却装置と一緒に安全に処理できる方法を提供するものである。
【０００５】
【課題を解決するための手段】
廃棄処分される廃冷却装置を破砕する破砕ステップと、この破砕ステップからの破砕片から発泡断熱材を分離する分離ステップと、分離した発泡断熱材から発泡ガスを脱気して回収する発泡ガス回収ステップとを有する発泡断熱材の発泡ガス回収方法において、破砕ステップにおける廃冷却装置の破砕の際に発泡断熱材からの可燃性または爆発性を有する発泡ガスを検知したなら、破砕ステップ及び発泡ガス回収ステップでの発泡ガスの吸引回収時の吸引量を増加させて発泡ガスの濃度を低下させることによる。
また、廃棄処分される廃冷却装置を破砕する破砕ステップと、この破砕ステップからの破砕片から発泡断熱材を分離する分離ステップと、分離した発泡断熱材から発泡ガスを脱気して回収する発泡ガス回収ステップとを有する発泡断熱材の発泡ガス回収方法において、破砕ステップにおける廃冷却装置の破砕の際に発泡断熱材からの可燃性または爆発性を有する発泡ガスを検知したなら、破砕ステップ及び発泡ガス回収ステップの発泡ガス脱気時に不活性ガスまたは水蒸気を発生させることによる。
さらに、廃棄処分される廃冷却装置を破砕する破砕ステップと、この破砕ステップからの破砕片から発泡断熱材を分離する分離ステップと、分離した発泡断熱材から発泡ガスを脱気して回収する発泡ガス回収ステップとを有する発泡断熱材の発泡ガス回収方法において、廃冷却装置の破砕の際に粉じん濃度を検出して、粉じん爆発の発生する濃度に達する前に粉じん濃度を低下させることによる。
【０００６】
【作用】
破砕ステップにおける廃冷却装置の破砕の際に発泡断熱材からの可燃性または爆発性を有する発泡ガスを検知し、破砕ステップ及び発泡ガス回収ステップでの発泡ガスの吸引回収時の吸引量を増加させて発泡ガスの濃度を低下させる、または破砕ステップ及び発泡ガス回収ステップの発泡ガス脱気時に不活性ガスまたは水蒸気を発生させることにより、発泡ガスによる可燃及び爆発を未然に防止できる。
また、廃冷却装置の破砕の際に粉じん濃度を検出し、粉じん爆発の発生する濃度に達する前に粉じん濃度を低下させることにより、粉じん爆発を未然に防止できる。
【０００７】
【実施例】
以下、一実施を図１により説明する。
【０００８】
図１は装置全体の構成を示したもので、発泡断熱材を用いた冷却装置（例えば家庭用冷蔵庫）１は破砕装置３及び分離装置４のフ−ドカバ−及びダクト２の上部に設けられた投入口２ａより投入される。投入された冷却装置１は、破砕装置３内の互いに噛み合うように設けられた多速の破砕刃３ａにより破砕された後、分離装置４に投入される。破砕装置３及び分離装置４はフ−ドカバ−及びダクト２により閉空間を成す構造となっており、破砕及び分離の際に発生した発泡ガスは発泡ガス回収装置６へ吸引パイプ６ａを通じて、回収される。分離装置４に投入された破砕片１ａは分離装置４内に設けられた回転衝撃ハンマ−４ａにより分離片１ｂに分離される。この分離片１ｂは金属１ｆ、プラスチック１ｃ、発泡断熱材１ｄと各材質ごとに分離される。この分離片１ｂは風力選別機９の投入口７に入る。投入口７に投入された分離片１ｆ、１ｃ、１ｄは風力発生ファン８により発生した、風力により破砕片１ｆ、１ｃ、１ｄのそれぞれの材質による比重の差を利用して発泡断熱材１ｄ、とプラスチック１ｃ及び金属１ｆとに選別される。選別されたプラスチック１ｃ及び金属１ｆはプラスチック、金属搬出ホッパ９ｂより排出され、発泡断熱材１ｄは、ホッパ７ａから粉砕機投入用スクリュウ−フィ−ダ１２により粉砕機１３に送られる。ここで、可燃性及び爆発性ガス検知器５により可燃性及び爆発性ガスが検知された場合、ダンパ−１０により装置外に設けられた収納箱１１に格納される。粉砕機１３で粉砕された発泡断熱材１ｄは気泡を破砕され、気泡内の発泡ガスを脱気した後、樹脂部分１ｅは圧縮装置１４において圧縮され、減容化及び雰囲気発泡ガスを除去された後、外部へ搬出される。また、脱気した発泡ガスは、バグフィルタ１５を通過し、微粉状の樹脂部分を除去した後、圧縮機１６で圧縮され、凝縮器１７で冷却により液化された後、捕集タンク１８にて貯蔵される。なお、可燃性及び爆発性発泡ガスを使用した冷却装置が少ない場合、この方法は大変有効である。
【０００９】
図２では不活性ガス及び水蒸気パ−ジについて説明する。図１の発泡ガス回収装置に不活性ガスまたは水蒸気発生装置２１をフ−ドカバ−及びダクト２と粉砕機１３に取り付けて、可燃性及び爆発性ガス検知器５により、可燃性及び爆発性ガスを検知した場合、不活性ガスまたは水蒸気発生装置２１ａ及び／又は２１ｂより不活性ガスまたは水蒸気を発生させ、可燃及び爆発を防止する。
【００１０】
図３では可燃性及び爆発性ガス検知器５により、可燃性及び爆発性ガスを検知した場合、発泡ガス回収装置６及び圧縮機１６の吸引量を増加させ、可燃性及び爆発性ガスの濃度を低下させてやることで、可燃及び爆発を防止する。
【００１１】
図４では可燃性及び爆発性ガス検知器５により、可燃性及び爆発性ガスを検知した場合、発泡ガス回収装置６は吸引量を増加させ、可燃性及び爆発性ガスの濃度を低下させてやり、解放弁４１では可燃性及び爆発性ガスを排気させることにより、可燃及び爆発を防止する。
【００１２】
図５では粉じん濃度測定器５１により、粉じん爆発の発生する粉じん濃度に達する前に発泡ガス回収装置６と圧縮機１６の吸引量を増加させ、粉じん濃度を低下させることで粉じん爆発を防止する。
【００１３】
本実施例においては、シクロペンタンガスの防爆対策について説明したが、冷媒として使用されるアンモニアガス、廃冷蔵庫中に放置される可能性があるスプレー等の可燃性含有物、あるいは誤って回収装置に投入される可能性があるボンベ類に対してもそれぞれの成分の検出器を設け、検出時には破砕機を動作停止させ、あるいは回収装置全体を動作停止させることにより、本実施例の場合と同様に危険防止を図ることができる。
【００１４】
【発明の効果】
本発明によれば、発泡断熱材の発泡ガス回収装置において、廃冷却装置の発泡断熱材に使用されている発泡剤が不明でも安全に処理することが出来る。
【図面の簡単な説明】
【図１】本発明による発泡ガス回収装置の一実施例を示す構成図である。
【図２】本発明による発泡ガス回収装置の他の実施例を示す構成図である。
【図３】本発明による発泡ガス回収装置の他の実施例を示す構成図である。
【図４】本発明による発泡ガス回収装置の他の実施例を示す構成図である。
【図５】本発明による発泡ガス回収装置の他の実施例を示す構成図である。
【符号の説明】
１…廃冷却装置、１ａ…破砕片、１ｂ…分離片、１ｃ…プラスチック、１ｄ…発泡断熱材、１ｅ…樹脂部分、１ｆ…金属、２…フ−ドカバ−及びダクト、２ａ…投入口、３…破砕装置、３ａ…破砕刃、４…分離装置、４ａ…回転衝撃ハンマ−、５…可燃性ガス及び爆発性ガス検知器、６…発泡ガス回収装置、６ａ…吸引パイプ、７…投入口、７ａ…ホッパ、８…風力発生ファン、９…風力選別機、９ａ…排気口、９ｂ…プラスチック、金属搬出ホッパ、１０…ダンパ−、１１…収納箱、１２…スクリュ−フィ−ダ、１３…粉砕機、１４…圧縮装置、１５…バグフィルタ、１６…圧縮機、１７…凝縮器、１８…捕集タンク、２１…不活性ガスまたは水蒸気発生装置、４１…解放弁、５１…粉じん濃度測定器。[0001]
[Industrial application fields]
The present invention relates to a processing method and a processing apparatus for unnecessary foam insulation used in a waste cooling device such as a refrigerator to be disposed of, and particularly relates to a method for degassing and recovering foam gas from the foam insulation. .
[0002]
[Prior art]
Conventionally, as a well-known example, there is an apparatus (for example, JP-A-6-184348) for recovering foam gas from foam insulation, but the foam gas to be recovered has flammability and / or explosive properties such as Freon gas. No gas. On the other hand, cyclopentane gas, which has begun to be used in place of Freon gas as foaming gas, is flammable and / or explosive. Such flammable and / or explosive foam gas can be obtained by a conventional foaming gas recovery device. If treated, there is a risk of explosion.
[0003]
[Problems to be solved by the invention]
Since a foaming gas having flammability and / or explosive properties such as cyclopentane gas has hardly been used, the conventional foaming gas recovery device does not consider any measures against foaming gas having flammability and explosive properties.
[0004]
The present invention is directed to the entire recovery system, and the problem to be solved relates to a system that prevents flammability and explosion when crushing and separating a cooling device, and safely recovers foaming gas. The present invention provides a method that can be safely processed together with a cooling device that does not contain a flammable and explosive foaming gas, without investigating whether the cooling device contains a foaming gas having flammability and explosive properties.
[0005]
[Means for Solving the Problems]
A crushing step for crushing the waste cooling device to be disposed of, a separation step for separating the foam insulation from the crushed pieces from the crushing step, and a foam gas recovery for degassing and collecting the foam gas from the separated foam insulation In the foam gas recovery method for the foam insulation having the step, if the flammable or explosive foam gas is detected from the foam insulation during the crushing of the waste cooling device in the crushing step, the crushing step and the foam gas recovery By increasing the suction amount at the time of sucking and collecting the foaming gas in the step to lower the foaming gas concentration.
Also, a crushing step for crushing the waste cooling device to be disposed of, a separation step for separating the foam insulation from the crushed pieces from this crushing step, and a foam for degassing and collecting the foam gas from the separated foam insulation In the foaming gas recovery method for the foam insulation having a gas recovery step, if a flammable or explosive foam gas from the foam insulation is detected during crushing of the waste cooling device in the crushing step, the crushing step and foaming are detected. By generating an inert gas or water vapor during the degassing of the foaming gas in the gas recovery step.
Furthermore, the crushing step for crushing the waste cooling device to be disposed of, the separation step for separating the foam insulation from the crush pieces from this crushing step, and the foam for degassing and recovering the foam gas from the separated foam insulation In the foaming gas recovery method of the foam insulation having a gas recovery step, the dust concentration is detected when the waste cooling device is crushed, and the dust concentration is reduced before reaching the concentration at which the dust explosion occurs.
[0006]
[Action]
When crushing the waste cooling device in the crushing step, it detects flammable or explosive foaming gas from the foam insulation, and increases the amount of suction when sucking and collecting the foamed gas in the crushing step and foaming gas recovery step By reducing the concentration of the foaming gas, or by generating an inert gas or water vapor at the time of degassing the foaming gas in the crushing step and the foaming gas recovery step, flammability and explosion due to the foaming gas can be prevented.
Also, dust explosion can be prevented in advance by detecting the dust concentration when crushing the waste cooling device and reducing the dust concentration before reaching the concentration at which dust explosion occurs.
[0007]
【Example】
One embodiment will be described below with reference to FIG.
[0008]
FIG. 1 shows the configuration of the entire apparatus, and a cooling device (for example, a home refrigerator) 1 using a foam heat insulating material is provided above the crushing device 3 and the separation device 4 at the feed cover and the duct 2. It is introduced from the inlet 2a. The cooled cooling device 1 is crushed by a multi-speed crushing blade 3 a provided so as to mesh with each other in the crushing device 3, and then fed into the separation device 4. The crushing device 3 and the separating device 4 have a structure in which a closed space is formed by the feed cover and the duct 2, and the foamed gas generated during crushing and separation is recovered to the foamed gas recovery device 6 through the suction pipe 6a. The The crushed pieces 1a thrown into the separating device 4 are separated into separated pieces 1b by a rotary impact hammer-4a provided in the separating device 4. This separation piece 1b is separated for each material from the metal 1f, the plastic 1c, and the foam heat insulating material 1d. This separated piece 1 b enters the inlet 7 of the wind power sorter 9. Separating pieces 1f, 1c, 1d thrown into the inlet 7 are foam insulation 1d, using the difference in specific gravity of the crushing pieces 1f, 1c, 1d generated by the wind power generation fan 8 by the wind force. Sorted into plastic 1c and metal 1f. The selected plastic 1c and metal 1f are discharged from the plastic and metal carry-out hopper 9b, and the foam insulation 1d is sent from the hopper 7a to the pulverizer 13 by the pulverizer charging screw feeder 12. Here, when combustible and explosive gas is detected by the combustible and explosive gas detector 5, it is stored by the damper 10 in the storage box 11 provided outside the apparatus. The foam insulation 1d pulverized by the pulverizer 13 was crushed and degassed the foam gas in the bubbles, and then the resin portion 1e was compressed by the compression device 14 to reduce the volume and remove the atmospheric foam gas. After that, it is carried out. The degassed foamed gas passes through the bag filter 15, removes the fine powdered resin portion, is compressed by the compressor 16, is liquefied by cooling by the condenser 17, and then is collected in the collection tank 18. Stored. In addition, this method is very effective when there are few cooling devices using combustible and explosive foaming gas.
[0009]
In FIG. 2, an inert gas and a water vapor purge will be described. An inert gas or water vapor generating device 21 is attached to the foam cover and duct 2 and the pulverizer 13 in the foaming gas recovery device of FIG. 1, and the combustible and explosive gas detector 5 supplies the combustible and explosive gas. When detected, an inert gas or water vapor is generated from the inert gas or water vapor generators 21a and / or 21b to prevent combustibility and explosion.
[0010]
In FIG. 3, when the combustible and explosive gas detector 5 detects the combustible and explosive gas, the suction amount of the foaming gas recovery device 6 and the compressor 16 is increased, and the concentration of the combustible and explosive gas is increased. By reducing it, flammability and explosion are prevented.
[0011]
In FIG. 4, when the combustible and explosive gas detector 5 detects the combustible and explosive gas, the foaming gas recovery device 6 increases the suction amount and lowers the concentration of the combustible and explosive gas. The release valve 41 prevents combustible and explosive gas by exhausting combustible and explosive gases.
[0012]
In FIG. 5, the dust concentration measuring device 51 prevents the dust explosion by increasing the suction amount of the foaming gas recovery device 6 and the compressor 16 before reaching the dust concentration at which the dust explosion occurs and lowering the dust concentration.
[0013]
In this embodiment, the explosion prevention measures for cyclopentane gas have been described. However, ammonia gas used as a refrigerant, flammable contents such as spray that may be left in a waste refrigerator, or accidentally collected in a recovery device. Similarly to the case of this embodiment, a detector for each component is also provided for cylinders that may be charged, and the crusher is stopped during detection or the entire recovery device is stopped. It is possible to prevent danger.
[0014]
【The invention's effect】
According to the present invention, in the foaming gas recovery device for foam insulation, the foaming agent used in the foam insulation for the waste cooling device can be safely processed even if the foaming agent is unknown.
[Brief description of the drawings]
FIG. 1 is a configuration diagram showing an embodiment of a foaming gas recovery apparatus according to the present invention.
FIG. 2 is a configuration diagram showing another embodiment of the foaming gas recovery apparatus according to the present invention.
FIG. 3 is a configuration diagram showing another embodiment of the foaming gas recovery apparatus according to the present invention.
FIG. 4 is a block diagram showing another embodiment of the foaming gas recovery apparatus according to the present invention.
FIG. 5 is a configuration diagram showing another embodiment of the foaming gas recovery apparatus according to the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Waste cooling device, 1a ... Shredded piece, 1b ... Separation piece, 1c ... Plastic, 1d ... Foam heat insulating material, 1e ... Resin part, 1f ... Metal, 2 ... Food cover and duct, 2a ... Input port, 3 ... crushing device, 3a ... crushing blade, 4 ... separation device, 4a ... rotary impact hammer, 5 ... combustible gas and explosive gas detector, 6 ... foaming gas recovery device, 6a ... suction pipe, 7 ... inlet, 7a ... Hopper, 8 ... Wind generating fan, 9 ... Wind sorter, 9a ... Exhaust port, 9b ... Plastic, metal carry-out hopper, 10 ... Damper, 11 ... Storage box, 12 ... Screw feeder, 13 ... Grinding 14 ... compressor, 15 ... bag filter, 16 ... compressor, 17 ... condenser, 18 ... collection tank, 21 ... inert gas or water vapor generator, 41 ... release valve, 51 ... dust concentration measuring device.

Claims (3)

廃棄処分される廃冷却装置を破砕する破砕ステップと、この破砕ステップからの破砕片から発泡断熱材を分離する分離ステップと、分離した発泡断熱材から発泡ガスを脱気して回収する発泡ガス回収ステップとを有する発泡断熱材の発泡ガス回収方法において、前記破砕ステップにおける前記廃冷却装置の破砕の際に前記発泡断熱材からの可燃性または爆発性を有する発泡ガスを検知したなら、前記破砕ステップ及び前記発泡ガス回収ステップでの発泡ガスの吸引回収時の吸引量を増加させて該発泡ガスの濃度を低下させることを特徴とする発泡断熱材の発泡ガス回収方法。 A crushing step for crushing the waste cooling device to be disposed of, a separation step for separating the foam insulation from the crushed pieces from the crushing step, and a foam gas recovery for degassing and collecting the foam gas from the separated foam insulation in blowing gas recovery method of foam insulation having a step, if it detects a foaming gas with flammable or explosive from the foam insulation during crushing of the waste cooling device in the crushing step, the crushing step And a foaming gas recovery method for a foam insulation, wherein the foaming gas recovery step increases the suction amount at the time of foaming gas suction recovery to reduce the concentration of the foaming gas. 廃棄処分される廃冷却装置を破砕する破砕ステップと、この破砕ステップからの破砕片から発泡断熱材を分離する分離ステップと、分離した発泡断熱材から発泡ガスを脱気して回収する発泡ガス回収ステップとを有する発泡断熱材の発泡ガス回収方法において、前記破砕ステップにおける前記廃冷却装置の破砕の際に前記発泡断熱材からの可燃性または爆発性を有する発泡ガスを検知したなら、前記破砕ステップ及び前記発泡ガス回収ステップの発泡ガス脱気時に不活性ガスまたは水蒸気を発生させることを特徴とする発泡断熱材の発泡ガス回収方法。 A crushing step for crushing the waste cooling device to be disposed of, a separation step for separating the foam insulation from the crushed pieces from the crushing step, and a foam gas recovery for degassing and collecting the foam gas from the separated foam insulation in blowing gas recovery method of foam insulation having a step, if it detects a foaming gas with flammable or explosive from the foam insulation during crushing of the waste cooling device in the crushing step, the crushing step And a foaming gas recovery method for a foam insulation , wherein an inert gas or water vapor is generated at the time of degassing the foaming gas in the foaming gas recovery step . 廃棄処分される廃冷却装置を破砕する破砕ステップと、この破砕ステップからの破砕片から発泡断熱材を分離する分離ステップと、分離した発泡断熱材から発泡ガスを脱気して回収する発泡ガス回収ステップとを有する発泡断熱材の発泡ガス回収方法において、前記破砕ステップにおける前記廃冷却装置の破砕の際に粉じん濃度を検出して、粉じん爆発の発生する濃度に達する前に粉じん濃度を低下させることを特徴とする発泡断熱材の発泡ガス回収方法。 A crushing step for crushing the waste cooling device to be disposed of, a separation step for separating the foam insulation from the crushed pieces from the crushing step, and a foam gas recovery for degassing and collecting the foam gas from the separated foam insulation In the foaming gas recovery method of the foam insulation having a step , detecting the dust concentration at the time of crushing the waste cooling device in the crushing step, and reducing the dust concentration before reaching the concentration at which the dust explosion occurs A foaming gas recovery method for a foaming heat insulating material.
JP2000081783A 1995-08-21 2000-03-17 Foam gas recovery method for foam insulation Expired - Lifetime JP3684322B2 (en)

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JP21155095A JP3251473B2 (en) 1995-08-21 1995-08-21 Method and apparatus for recovering foam gas from foam insulation
JP2000081783A JP3684322B2 (en) 1995-08-21 2000-03-17 Foam gas recovery method for foam insulation

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