JP4391443B2 - Composite plate peeling method - Google Patents
Composite plate peeling method Download PDFInfo
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- JP4391443B2 JP4391443B2 JP2005148345A JP2005148345A JP4391443B2 JP 4391443 B2 JP4391443 B2 JP 4391443B2 JP 2005148345 A JP2005148345 A JP 2005148345A JP 2005148345 A JP2005148345 A JP 2005148345A JP 4391443 B2 JP4391443 B2 JP 4391443B2
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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
- Y02W30/62—Plastics recycling; Rubber recycling
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- Separation, Recovery Or Treatment Of Waste Materials Containing Plastics (AREA)
Description
本発明は、合成樹脂発泡体と金属板を接合してなる複合板の剥離方法であって、使用後
に合成樹脂発泡体と金属板の分別が容易な複合板の剥離方法に関する。
The present invention relates to a method for peeling a composite plate formed by joining a synthetic resin foam and a metal plate, and relates to a method for peeling a composite plate that allows easy separation of the synthetic resin foam and the metal plate after use.
従来、合成樹脂発泡体と金属板を接合してなる複合板を廃棄する場合、産業廃棄物として埋め立て処分していた。環境上の問題から、工業製品のリサイクルによる資源の有効利用が求められており、上記のような複合板についても、使用後に合成樹脂発泡体と金属板を分別しリサイクルすることが望まれる。しかし、合成樹脂発泡体と金属板を無理に剥がすと、金属板に合成樹脂発泡体のカスが残り、十分に分離することができない。金属板に残ったカスを削り取る方法は作業性が悪く実用的でない。 Conventionally, when a composite plate formed by joining a synthetic resin foam and a metal plate is discarded, it is disposed as landfill as industrial waste. Due to environmental problems, there is a demand for effective use of resources by recycling industrial products, and it is desirable to separate and recycle synthetic resin foam and metal plates after use, even for the above composite plates. However, if the synthetic resin foam and the metal plate are forcibly removed, the residue of the synthetic resin foam remains on the metal plate and cannot be sufficiently separated. The method of scraping off the residue remaining on the metal plate is not practical because of poor workability.
そこで、接着剤により合成樹脂発泡体と金属板とを接合することが行われているが、その場合の接着剤を改質することにより剥離性を向上させる試みがなされている。例えば、加熱により発泡する接着剤や熱剥離性接着剤がある。しかし、これらの接着剤は、樹脂や金属板の材質により効果が異なり、接着剤のコストが高いといった問題があった。 Therefore, the synthetic resin foam and the metal plate are bonded with an adhesive, and attempts have been made to improve the peelability by modifying the adhesive in that case. For example, there are adhesives that foam by heating and heat-peelable adhesives. However, the effects of these adhesives differ depending on the material of the resin or metal plate, and there is a problem that the cost of the adhesive is high.
本発明は、上記の事情に鑑みてなされたもので、合成樹脂発泡体と金属板を容易に剥離し、リサイクル性を向上させることを目的とする。 This invention is made | formed in view of said situation, and it aims at peeling easily a synthetic resin foam and a metal plate, and improving recyclability.
本発明において使用される合成樹脂発泡体は、連続気泡率が３５〜７５％であることを特徴とする。この合成樹脂発泡体を金属板と接合した複合板は、熱水に浸漬することにより、容易に剥離させることができる。 The synthetic resin foam used in the present invention is characterized by having an open cell ratio of 35 to 75%. A composite plate obtained by bonding this synthetic resin foam to a metal plate can be easily peeled off by being immersed in hot water.
すなわち本発明は、
（１）連続気泡率が３５〜７５％である合成樹脂発泡体の少なくとも一面に金属板が接合
された複合板を熱水に浸漬し、前記合成樹脂発泡体から前記金属板を剥離する複合板の剥
離方法、
（２）前記合成樹脂発泡体のベース樹脂がポリオレフィン系樹脂であることを特徴とする
（１）に記載の複合板の剥離方法、
に関する。
That is, the present invention
(1) A composite plate in which a composite plate in which a metal plate is bonded to at least one surface of a synthetic resin foam having an open cell ratio of 35 to 75% is immersed in hot water, and the metal plate is peeled off from the synthetic resin foam. Peeling
Separation method ,
(2) The composite resin peeling method according to (1), wherein the base resin of the synthetic resin foam is a polyolefin resin,
About.
本発明の合成樹脂発泡体を金属板と接合した複合板の剥離方法は、熱水に浸漬すること
により、容易に剥離させることができ、リサイクル性が良好である。
複合板は、壁、屋根、ベランダの目隠し、間仕切りなどの外装材や、天井、床などの内
装材、ドア材等に好適に用いることができる。
The method for peeling a composite plate in which the synthetic resin foam of the present invention is bonded to a metal plate can be easily peeled by being immersed in hot water, and the recyclability is good.
The composite plate can be suitably used for exterior materials such as walls, roofs, blindfolding of verandas, partitions, interior materials such as ceilings and floors, door materials, and the like.
本発明においては、連続気泡率はＡＳＴＭ Ｄ ２８５６（Ｓｔａｎｄａｒｄ Ｔｅｓｔ Ｍｅｔｈｏｄ ｆｏｒ Ｏｐｅｎ Ｃｅｌｌ Ｃｏｎｔｅｎｔ ｏｆ Ｒｉｇｉｄ ｆｏｒ Ｃｅｌｌｕｌａｒ Ｐｌａｓｔｉｃｓ ｂｙ ｔｈｅ Ａｉｒ Ｐｙｃｎｏｍｅｔｅｒ）に従って、Ｂｅｃｋｍａｎｎの空気比較式比重計の原理に基づき求められる。この方法はエアーピクノメーターにより測定される。エアーピクノメーターは前記ＡＳＴＭに規定されたものであれば制限されないが、その一例としては空気比較式比重計（東京サイエンス(株)製、１０００式）を挙げることができる。 In the present invention, the open cell ratio is based on Beckmann's principle of air comparison formula specific gravity according to ASTM D 2856 (Standard Test Method for Open Cell Content of Rigid for Cellulars by the Air Pycnometer). This method is measured by an air pycnometer. The air pycnometer is not limited as long as it is stipulated in the ASTM. One example is an air-comparing hydrometer (manufactured by Tokyo Science Co., Ltd., type 1000).
合成樹脂発泡体のベース樹脂の材質は、複合板の用途に応じて適宜選定することができるが、優れた断熱性や、クッション性、無害性を有していることから、ポリオレフィン系樹脂が好ましい。ポリオレフィン系樹脂とは低密度ポリエチレン、直鎖状低密度ポリエチレン、高密度ポリエチレン、ポリプロピレン、ポリブテン、エチレン−酢酸ビニル共重合体、エチレン−アクリル酸共重合体、エチレン−エチルアクリレート共重合体、エチレン−メチルアクリレート共重合体、エチレンプロピレンブテン三元共重合体等であり、樹脂は一種でも二種以上の混合物でも良い。 The material of the base resin of the synthetic resin foam can be appropriately selected according to the use of the composite plate, but polyolefin resin is preferable because it has excellent heat insulation, cushioning, and harmlessness. . Polyolefin resin is low density polyethylene, linear low density polyethylene, high density polyethylene, polypropylene, polybutene, ethylene-vinyl acetate copolymer, ethylene-acrylic acid copolymer, ethylene-ethyl acrylate copolymer, ethylene- Examples thereof include a methyl acrylate copolymer and an ethylene propylene butene terpolymer, and the resin may be one kind or a mixture of two or more kinds.
合成樹脂発泡体の製造方法には、熱分解型化学発泡剤を樹脂に練り込み、組成物となし、該発泡剤の分解温度以上に加熱することにより発泡せしめる化学発泡剤法や、不活性ガスを液化したものまたは揮発性液体を溶融樹脂組成物に圧入した後、低圧域に放出して発泡せしめるガス発泡法が知られている。本発明において所望の連続気泡率が得られれば合成樹脂発泡体の製造方法は適宜選定することができるが、不活性ガスを発泡剤として用いる場合には、不活性ガスは炭酸ガス、窒素ガス、水蒸気等が好ましい。中でも、樹脂への浸透性、安全性を考慮して炭酸ガスが特に好ましい。 The synthetic resin foam manufacturing method includes a chemical foaming agent method in which a thermally decomposable chemical foaming agent is kneaded into a resin to form a composition, which is foamed by heating to a temperature higher than the decomposition temperature of the foaming agent, or an inert gas. There is known a gas foaming method in which a liquefied product or a volatile liquid is injected into a molten resin composition and then released into a low pressure region to cause foaming. In the present invention, if a desired open cell ratio is obtained, a method for producing a synthetic resin foam can be appropriately selected. However, when an inert gas is used as a foaming agent, the inert gas is carbon dioxide, nitrogen gas, Steam or the like is preferable. Among these, carbon dioxide gas is particularly preferable in consideration of the permeability to the resin and safety.
ベース樹脂は非架橋のまま発泡させても、過酸化物などの化学架橋剤もしくは放射線によって架橋処理したベース樹脂を発泡させても良い。さらに、ベース樹脂中には必要に応じて、各種充填剤、帯電防止剤、酸化防止剤、導電性材料、難燃剤、顔料、結晶核剤、熱老化防止剤、遮光剤、紫外線防止剤、耐候剤、滑剤、架橋剤、架橋助剤、発泡助剤、気泡調節剤、可塑剤、安定剤、消泡剤、増粘剤、減粘剤、乳化剤等を適量配合しても構わない。 The base resin may be foamed without being cross-linked, or the base resin cross-linked with a chemical cross-linking agent such as peroxide or radiation may be foamed. Furthermore, in the base resin, various fillers, antistatic agents, antioxidants, conductive materials, flame retardants, pigments, crystal nucleating agents, heat aging inhibitors, light-shielding agents, UV inhibitors, weather resistance, as necessary. An appropriate amount of an agent, a lubricant, a crosslinking agent, a crosslinking aid, a foaming aid, a foam regulator, a plasticizer, a stabilizer, an antifoaming agent, a thickener, a thickener, an emulsifier, and the like may be blended.
本発明で用いる金属板の材質は適宜選定することができるが、例えば、アルミ板、鉄、銅、ステンレス、チタン、各種めっき鋼板等を使用できる。これらは耐腐食性を高めるために表面処理を施したものを使用しても良い。 Although the material of the metal plate used by this invention can be selected suitably, for example, an aluminum plate, iron, copper, stainless steel, titanium, various plated steel plates, etc. can be used. You may use these which surface-treated in order to improve corrosion resistance.
本発明において、合成樹脂発泡体と金属板との接合は、熱による融着や接着剤を用いた貼付等により適宜行われる。接着剤の材質は問わないが、例えば、ポリウレタン、メラミン樹脂、エポキシ樹脂、フェノール樹脂などがある。接着剤は溶剤に溶かして塗布してもラミネートしたフィルムを使用しても良いが、本発明においては、特に無溶剤の２液混合硬化型接着剤が好ましい。 In the present invention, the synthetic resin foam and the metal plate are appropriately joined by heat fusion or sticking using an adhesive. The material of the adhesive is not limited, and examples thereof include polyurethane, melamine resin, epoxy resin, and phenol resin. The adhesive may be dissolved in a solvent and applied, or a laminated film may be used. In the present invention, a solventless two-component mixed curing adhesive is particularly preferable.
連続気泡率が３５〜７５％である合成樹脂発泡体と金属板を接合した複合板を熱水に浸漬すると、熱水が気泡内を伝わって浸透し、発泡体と金属板の界面の接着性を弱める。ここで、熱水とは９５℃以上の水を主成分とする液体で、熱水の温度が高くなるほど浸漬時間が短くても合成樹脂発泡体と金属板を剥離することができる。 When a composite plate in which a synthetic resin foam having an open cell ratio of 35 to 75% is bonded to a metal plate is immersed in hot water, the hot water penetrates through the bubbles and adheres to the interface between the foam and the metal plate. Weaken. Here, the hot water is a liquid mainly composed of water at 95 ° C. or higher, and the synthetic resin foam and the metal plate can be peeled even if the immersion time is shorter as the temperature of the hot water is higher.
本発明においては、前記熱水の表面張力を下げることにより、合成樹脂発泡体と金属板の剥離に要する時間を短くすることが可能である。熱水の表面張力を下げる方法は特に限定されないが、例えば、熱水中に水に表面張力を下げる物質を添加する等が挙げられる。表面張力を下げる物質としては、例えば、水酸化ナトリウム溶液などが挙げられる。
本発明においては、発泡体と金属板の剥離に高温高圧の蒸気を使用する必要がないため、高耐圧性能を備えたオートクレーブ等の特殊な設備が不要である。
In the present invention, it is possible to shorten the time required for peeling off the synthetic resin foam and the metal plate by lowering the surface tension of the hot water. The method for lowering the surface tension of hot water is not particularly limited, and examples thereof include adding a substance that lowers the surface tension to water in hot water. Examples of the substance that lowers the surface tension include a sodium hydroxide solution.
In the present invention, since it is not necessary to use high-temperature and high-pressure steam for peeling the foam and the metal plate, special equipment such as an autoclave having high pressure resistance is unnecessary.
本発明の合成樹脂発泡体において、連続気泡率が３５％未満では、発泡体が硬く熱水の浸透も十分でないため合成樹脂発泡体と金属板が剥離しない。一方、７５％より大きい場合は、発泡体が軟弱で芯材としてのコシが無いため、本来の芯材としての機能が発揮されない。なお、合成樹脂発泡体と金属板の剥離時間を早めるために、連続気泡率は４０〜６０％がより好ましい。 In the synthetic resin foam of the present invention, if the open cell ratio is less than 35%, the foam is hard and the penetration of hot water is not sufficient, so the synthetic resin foam and the metal plate do not peel off. On the other hand, when it is larger than 75%, the foam is soft and has no stiffness as a core material, so that the original function as a core material is not exhibited. In addition, in order to accelerate the peeling time of the synthetic resin foam and the metal plate, the open cell ratio is more preferably 40 to 60%.
本発明においては、合成樹脂発泡体の気泡径は特に限定されないが、０．０５〜１．５ｍｍが好ましく、さらに好ましくは０．１〜１．０ｍｍである。気泡径が０．０５ｍｍより小さいと、熱水が浸透しにくいため剥離に時間がかかる場合がある。 In the present invention, the cell diameter of the synthetic resin foam is not particularly limited, but is preferably 0.05 to 1.5 mm, and more preferably 0.1 to 1.0 mm. When the bubble diameter is smaller than 0.05 mm, it may take time to peel off because hot water hardly permeates.
以下に本発明を実施例によって説明する。
（実施例１）
合成樹脂発泡体のベース樹脂にはポリプロピレン（密度９００ｋｇ／ｍ３、ＭＩ（２３０℃、２１．１８Ｎ）２．０ｇ／１０分）を用いた。このポリプロピレン１００質量部に、気泡核剤としてクエン酸ナトリウム（商品名ポリスレン、永和化成株式会社）1質量部を予めブレンダ−で混合し、その混合物を口径１３５φｍｍの発泡押出機に供給し、押出機の中央ゾ−ンで炭酸ガスを注入して発泡させた。押出機の温度は１６０〜２１０℃とした。得られた発泡体は見掛け密度３１０ｋｇ／ｍ３、発泡倍率３倍、連続気泡率５３％、気泡径０．１ｍｍであった。発泡体をＪＩＳ Ｋ ７１６１に従って引張速度５００ｍｍ／ｍｉｎで引張試験をしたところ、引張強度は５ＭＰａとなり、芯材として使用するのに好適な発泡体であった。
この発泡体の両面に厚さ０．１２ｍｍのアルミニウム板を接合し複合板とした。接合の際にはポリオールとイソシアネートの２液混合剤で接着した。
得られた複合板を９５℃の熱水に浸漬したところ、浸漬後２日で金属板と合成樹脂発泡体芯材の界面から剥離した。金属板には合成樹脂発泡体芯材のカスなどは付着していなかった。
Hereinafter, the present invention will be described by way of examples.
Example 1
Polypropylene (density 900 kg / m 3 , MI (230 ° C., 21.18 N) 2.0 g / 10 min) was used as the base resin of the synthetic resin foam. 1 part by mass of sodium citrate (trade name: Polyslen, Eiwa Kasei Co., Ltd.) as a cell nucleating agent was mixed in advance with a blender to 100 parts by mass of this polypropylene, and the mixture was supplied to a foaming extruder having a diameter of 135 mm. Carbon dioxide gas was injected at the center zone of the gas and foamed. The temperature of the extruder was 160 to 210 ° C. The obtained foam had an apparent density of 310 kg / m 3 , an expansion ratio of 3 times, an open cell ratio of 53%, and a cell diameter of 0.1 mm. When the foam was subjected to a tensile test at a tensile speed of 500 mm / min in accordance with JIS K 7161, the tensile strength was 5 MPa, and the foam was suitable for use as a core material.
An aluminum plate having a thickness of 0.12 mm was joined to both surfaces of the foamed material to form a composite plate. At the time of joining, adhesion was performed with a two-component mixture of polyol and isocyanate.
When the obtained composite plate was immersed in hot water at 95 ° C., it peeled off from the interface between the metal plate and the synthetic resin foam core material two days after the immersion. No synthetic resin foam core residue or the like adhered to the metal plate.
以下の実施例および比較例において、合成樹脂発泡体芯材の連続気泡率は押出機の温度を
調整して変化させた。
（実施例２）
合成樹脂発泡体芯材の連続気泡率を７２％とした以外は実施例１と同じとした。得られた複合板を９５℃の熱水に浸漬したところ、浸漬後１日で金属板と合成樹脂発泡体芯材の界面から剥離した。金属板には合成樹脂発泡体芯材のカスなどは付着していなかった。
In the following examples and comparative examples, the open cell ratio of the synthetic resin foam core material was changed by adjusting the temperature of the extruder.
(Example 2)
The same as Example 1 except that the open cell ratio of the synthetic resin foam core material was 72%. When the obtained composite plate was immersed in hot water at 95 ° C., it peeled from the interface between the metal plate and the synthetic resin foam core material in one day after the immersion. No synthetic resin foam core residue or the like adhered to the metal plate.
（実施例３）
合成樹脂発泡体芯材の連続気泡率を３８％とした以外は実施例１と同じとした。得られた複合板を９５℃の熱水に浸漬したところ、浸漬後８日で金属板と合成樹脂発泡体芯材の界面から剥離した。金属板には合成樹脂発泡体芯材のカスなどは付着していなかった。
(Example 3)
The same as Example 1 except that the open cell ratio of the synthetic resin foam core material was 38%. When the obtained composite plate was immersed in hot water at 95 ° C., it peeled off from the interface between the metal plate and the synthetic resin foam core material 8 days after the immersion. No synthetic resin foam core residue or the like adhered to the metal plate.
（実施例４）
複合板を９５℃の５％水酸化ナトリウム溶液に浸漬させた以外は実施例１と同じとした。浸漬後12時間で金属板と合成樹脂発泡体芯材の界面から剥離した。金属板には合成樹脂発泡体芯材のカスなどは付着していなかった。
(Example 4)
The composite plate was the same as Example 1 except that the composite plate was immersed in a 5% sodium hydroxide solution at 95 ° C. It peeled from the interface of a metal plate and a synthetic resin foam core material 12 hours after immersion. No synthetic resin foam core residue or the like adhered to the metal plate.
（実施例５）
合成樹脂発泡体の気泡径を０．０５ｍｍとした以外は実施例１と同じとした。得られた複合板を９５℃の熱水に浸漬したところ、浸漬後8日で金属板と合成樹脂発泡体芯材の界面から剥離した。金属板には合成樹脂発泡体芯材のカスなどは付着していなかった。
(Example 5)
The same as Example 1 except that the cell diameter of the synthetic resin foam was 0.05 mm. When the obtained composite plate was immersed in hot water at 95 ° C., it peeled off from the interface between the metal plate and the synthetic resin foam core material 8 days after the immersion. No synthetic resin foam core residue or the like adhered to the metal plate.
（実施例６）
合成樹脂発泡体の気泡径を０．７５ｍｍとした以外は実施例１と同じとした。得られた複合板を９５℃の熱水に浸漬したところ、浸漬後1日で金属板と合成樹脂発泡体芯材の界面から剥離した。金属板には合成樹脂発泡体芯材のカスなどは付着していなかった。
(Example 6)
The same as Example 1 except that the bubble diameter of the synthetic resin foam was changed to 0.75 mm. When the obtained composite plate was immersed in hot water at 95 ° C., it peeled from the interface between the metal plate and the synthetic resin foam core material in one day after the immersion. No synthetic resin foam core residue or the like adhered to the metal plate.
（実施例７）
合成樹脂発泡体の気泡径を１．５ｍｍとした以外は実施例１と同じとした。得られた複合板を９５℃の熱水に浸漬したところ、浸漬後20時間で金属板と合成樹脂発泡体芯材の界面から剥離した。金属板には合成樹脂発泡体芯材のカスなどは付着していなかった。
(Example 7)
The same as Example 1 except that the cell diameter of the synthetic resin foam was 1.5 mm. When the obtained composite plate was immersed in hot water at 95 ° C., it was peeled off from the interface between the metal plate and the synthetic resin foam core material 20 hours after the immersion. No synthetic resin foam core residue or the like adhered to the metal plate.
（実施例８）
合成樹脂発泡体の気泡径を２．０ｍｍとした以外は実施例１と同じとした。得られた複合板を９５℃の熱水に浸漬したところ、浸漬後12時間で金属板と合成樹脂発泡体芯材の界面から剥離した。金属板には合成樹脂発泡体芯材のカスなどは付着していなかった。
(Example 8)
The same as Example 1 except that the cell diameter of the synthetic resin foam was 2.0 mm. When the obtained composite plate was immersed in hot water at 95 ° C., it peeled off from the interface between the metal plate and the synthetic resin foam core material 12 hours after the immersion. No synthetic resin foam core residue or the like adhered to the metal plate.
（比較例１）
合成樹脂発泡体芯材の連続気泡率を３０％とした以外は実施例１と同じとした。得られた複合板を９５℃の熱水に浸漬したところ、金属板と合成樹脂発泡体芯材は剥離しなかった。
(Comparative Example 1)
The same as Example 1 except that the open cell ratio of the synthetic resin foam core was 30%. When the obtained composite plate was immersed in hot water at 95 ° C., the metal plate and the synthetic resin foam core material did not peel off.
（比較例２）
合成樹脂発泡体芯材の連続気泡率を７７％とした以外は実施例１と同じとした。発泡体の表面が平滑で無いため金属板との接合に多量の接着剤を要した。さらにこの合成樹脂発泡体は軟弱であるため、本来の芯材としての機能が発揮されない。よって熱水への浸漬は行わなかった。
(Comparative Example 2)
The same as Example 1 except that the open cell ratio of the synthetic resin foam core material was 77%. Since the surface of the foam was not smooth, a large amount of adhesive was required for joining to the metal plate. Furthermore, since this synthetic resin foam is soft, the original function as a core material is not exhibited. Therefore, it was not immersed in hot water.
（比較例３）
合成樹脂発泡体として連続気泡率が８０％ポリウレタンフォームを使用した以外は実施例１と同じとした。この合成樹脂発泡体は軟弱であるため、本来の芯材としての機能が発揮されない。金属板との接合および熱水への浸漬は行わなかった。
(Comparative Example 3)
The same as Example 1 except that polyurethane foam having an open cell ratio of 80% was used as the synthetic resin foam. Since this synthetic resin foam is soft, the original function as a core material is not exhibited. Bonding with a metal plate and immersion in hot water were not performed.
注）合成樹脂発泡体芯材の強度
◎：芯材として使用する場合に極めて良好
○：芯材として使用する場合に良好
△：芯材として使用する場合に多少強度が不足
×：芯材としての使用は不適当
Note) Strength of synthetic resin foam core material ◎: Extremely good when used as a core material ○: Good when used as a core material △: Slightly insufficient strength when used as a core material ×: As a core material Inappropriate use
Claims (2)
た複合板を熱水に浸漬し、前記合成樹脂発泡体から前記金属板を剥離する複合板の剥離方
法。 A method of peeling a composite plate in which a composite plate in which a metal plate is bonded to at least one surface of a synthetic resin foam having an open cell ratio of 35 to 75% is immersed in hot water and the metal plate is peeled off from the synthetic resin foam
Law .
項１に記載の複合板の剥離方法。 2. The method of peeling a composite plate according to claim 1, wherein the base resin of the synthetic resin foam is a polyolefin resin.
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