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ドラムという機械

ドラムは、太鼓とも言います なめしや染色は、このドラムに皮を入れ薬品を投入して回転させながら行います。 仕込みの数量や投入する皮の種類によって大きさはまちまちですが、直径1mほどから大きいものでは数mになるものもあります。

ドラムは殆どが木製で地元の桶屋さんが作ってくれます。 いわゆる”桶”なので、醤油樽や酒樽を連想していただいて間違いはありませんし、実際に他の用途の桶や樽をいつも作っているようです。 この桶を立てて動力で回して使用します。 硬い樫の木を使うことが多いと聞きますが、確かにものすごい重量でしかも回転させながら使用するため木の材質は重要と考えられます。

木で出来ているため注意も必要です。

木で出来ているため薬品が染み込みます。なめしドラムであれば、タイプの異なるクロムと植物タンニンなめしのドラムは分けるべきですし、染色ドラムも色の薄い色用濃い色用と分ける必要があります。

木で出来ているため乾燥します。冬場の空気が乾燥する時期は、使用しない時には水を張って木が乾くのを防ぎます。コレを怠ると、木がはしゃいで水漏れの原因になります。

木で出来ているため馴染みます。使用し始めの頃、桶自体のバランスを取るのに水を少し張って、蓋をして寝かせます。このとき、皮を投入する口が作業をしやすい正面に来るようにするのがコツです。水を張ることによって濡れた下側の木が重くなり、ドラム口が正面を向いてくれるようになります。

木で出来ているため割れます。一度失敗をしたことがあります。うっかりとドラムに水を入れる蛇口を開けたままにして次の作業に取り掛かり、ドラムを破裂させてしまいました。「上膳の水」のとおり、水は強かったです。

ちなみに、ドラムの動力はモーターで動かします。ベルト式やプーリーで伝えてタイマーで時間管理をし、変速機のギアも工程別に設定できるようになっています。 いくつものドラムが並び、轟々と回転する様は迫力があり勇壮な光景です。


 
 
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