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四季のある国 日本でのなめし

日本の豚皮は、実は原料のまま海外にその大半が輸出されています。 殆どが香港経由で中国、他に台湾、韓国、フィリピンなど

南の国では、気温が高く水温も高いため、薬品を反応させるなめしにはうってつけの環境です 。強めのなめし(各工程で化学変化を増長するために気温も水温も高い方が良い)を必要とするスエードが多く作られるのも、製品の生産背景と相まって納得のいくところです。

一方、原産国の日本ですが、四季があるため常に気温や水温を気にかけなければいけません 。特に春から夏にかけてと、秋から冬にかけては要注意です。


そのため国内のどのタンナーも自社内にボイラーを持っていて、ドラム内の水温調整をしながら薬品を投入しなめしを行います。 また、ドラムの回転時間も微妙に調整し、求める品質の革になるよう気を配ります。

水温とドラム回転時間で調整することが出来ても、問題は朝晩の気温差です ドラムは木製で出来ており金属製に比べてドラム内温度の変化は緩やかですが、一昼夜漬け込んだりする工程の場合は、どうにもなりません。

そのため何年なめしを続けていても、結局革として仕上がった時点で判断するしかありません。 皮が革になるには日々の工程を経て1~2週間かかりますので、季節の変わり目を察知しどのタイミングで調整をするのかの判断は、一歩間違えると大きな失敗の元になります。 1~2週間分の仕込み皮の品質を左右してしまうからです。


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