JPH0747339A - Method for regenerating used metallic container - Google Patents

Abstract

PURPOSE:To efficiently remove the resin-components sticking to a used metallic container and to regenerate the container by cooling the used metallic container stuck with the resins to the solidification temp. of the resins or below, then peeling the resins. CONSTITUTION:The used metallic container stuck with the resins is cooled to the solidification temp. of the resins or below, and thereafter, the resins are peeled. For example, liquid nitrogen is blown to the inside of the used metallic container stuck with the resins, such as coating materials, printing ink, adhesives and the resin raw materials of these products, having adhesiveness to cool and solidify the resins sticking to the container. The stage thereof may be executed by putting the metallic container to be treated into a heat insulating vessel and cooling the container or introducing liquid nitrogen into the heat insulating vessel and cooling the entire part of the metallic container. The resin-components of the contents turn to be solid on glass and embrittle when cooled down to such low temp. and, therefore, even the resins sticking to the container are easily physically peeled from the container walls by impact or vibration or by using a spatula.

Description

【発明の詳細な説明】Detailed Description of the Invention

【０００１】[0001]

【発明の利用分野】本発明は、付着性樹脂を含む製品を
充填した金属容器を使用後、再生する方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of reusing a metal container filled with a product containing an adhesive resin after use.

【０００２】[0002]

【従来の技術】塗料、印刷インキ、接着剤、およびこれ
ら製品の樹脂原料等の製品は、ドラム缶等の金属容器に
充填され使用に供される。使用済み金属容器缶は、廃棄
物として処理されるか、再使用のための再生処理を行っ
ていた。使用済み金属容器を廃棄物として鉄くずにして
も、その処理前に樹脂分を除去する必要がある。これら
の樹脂分の除去のために、缶の内部にバーナー等の炎を
当てて樹脂を燃焼、除去するか、有機溶剤により洗浄、
除去することが行われている。2. Description of the Related Art Products such as paints, printing inks, adhesives, and resin raw materials for these products are filled in metal containers such as drums for use. Used metal container cans were either treated as waste or were recycled for reuse. Even if the used metal containers are scrapped as waste, the resin content must be removed before the treatment. To remove these resin components, apply a flame such as a burner to the inside of the can to burn and remove the resin, or wash with an organic solvent.
It is being removed.

【０００３】しかしながら、ドラム缶のように再生を目
的とする場合、焼却処理を行うと内部の塗装も一緒に燃
えてしまうので再塗装が必要という問題点があった。
又、有機溶剤による洗浄作業は、火災の危険や作業者の
安全衛生上の問題点があった。However, for the purpose of recycling such as a drum can, there is a problem that when the incineration process is performed, the internal coating is also burned, so that the recoating is necessary.
Further, the cleaning work with the organic solvent has a risk of fire and a problem of worker's health and safety.

【０００４】[0004]

【発明が解決すべき課題】本発明は、使用済み金属容器
に付着した樹脂分を効率的に除去し、再生可能とする方
法を提供することを目的とする。SUMMARY OF THE INVENTION It is an object of the present invention to provide a method for efficiently removing a resin component attached to a used metal container to make it recyclable.

【０００５】[0005]

【課題を解決するための手段】本発明は、樹脂が付着し
た使用ずみ金属容器を該樹脂の固化温度以下に冷却した
後該樹脂を剥離する、使用済み金属容器の再生方法に関
する。本発明によれば、始めに、塗料、印刷インキ、接
着剤、およびこれら製品の樹脂原料等の付着性を有する
樹脂が付着した使用済み金属容器の内部に液体窒素を吹
きつけて容器に付着した樹脂を冷却、固化する。この工
程は、断熱性容器に処理すべき金属容器を入れ、冷却す
るか液体窒素を断熱性容器に導き入れることによって断
熱性容器全体を冷却してもよい。この時の断熱性容器の
内部温度は−５０℃〜−１００℃が好ましい。内容物の
樹脂分はこのような低温になると、ガラス状の固体とな
って脆くなる。このため、樹脂は容器に付着していて
も、衝撃や振動、あるいはヘラを使用することにより物
理的に容易に容器壁から剥離することができる。SUMMARY OF THE INVENTION The present invention relates to a method for recycling a used metal container in which a used metal container to which a resin is attached is cooled to a temperature below the solidification temperature of the resin and then the resin is peeled off. According to the present invention, first, liquid nitrogen is blown to the inside of a used metal container to which a resin having an adhesive property such as a paint, a printing ink, an adhesive, and a resin raw material for these products is adhered to the container. The resin is cooled and solidified. In this step, the whole heat insulating container may be cooled by putting the metal container to be treated in the heat insulating container and cooling or introducing liquid nitrogen into the heat insulating container. At this time, the internal temperature of the heat insulating container is preferably −50 ° C. to −100 ° C. At such low temperatures, the resin content of the contents becomes a glassy solid and becomes brittle. Therefore, even if the resin adheres to the container, it can be physically and easily separated from the container wall by impact, vibration, or using a spatula.

【０００６】[0006]

【発明の効果】本発明によれば、使用済み金属容器を冷
却することによって、付着した樹脂分を簡単に剥離する
ことができる。特に印刷インキのように常温で粘調な製
品でも−５０℃程度に冷却するだけで樹脂が固化して剥
離しやすくなるので、従来の方法に比べて比較的安価に
ドラム缶を再生することができる。According to the present invention, the attached resin component can be easily peeled off by cooling the used metal container. In particular, even in the case of viscous products such as printing ink, which are viscous at room temperature, the resin can be solidified and easily peeled off just by cooling it to about -50 ° C, so that the drum can can be regenerated at a relatively low cost as compared with the conventional method. .

Claims (1)

【特許請求の範囲】[Claims] 【請求項１】 樹脂が付着した使用ずみ金属容器を該樹
脂の固化温度以下に冷却した後該樹脂を剥離する、使用
済み金属容器の再生方法。1. A method for recycling a used metal container, wherein a used metal container to which a resin is attached is cooled to a temperature below the solidifying temperature of the resin, and then the resin is peeled off.