原料皮の損傷に関する研究-1-塩蔵皮の乾燥がクロム革の性状におよぼす影響

概要

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The influence of drying salted hide and skin on the properties of chrome upper leather was investigated. New York wet salted calf skins with different moisture contents (20-50%) and Australia salted hide dried up to 20% of moisture content at the lowest were used for preparation of the chrome upper leather by usual method. The mechanical and chemical properties of the chrome leather were measured to observe the relation between the properties of chrome leather and the moisture content of salted hide material.The results of the experiments were as follow:(1) The chrome upper leather obtained from salted calf skin which had been dried up to less than 30% of moisture content during storage gave the lower elongation value at 1kg/mm2 load and at break, and also gave the lower bursting strength on the ball bursting meter.(2) The quality by appearance of chrome upper leather obtained from salted skin which had been dried up to less than 30% of moisture content was not good comparing to that of the normal moisture condition. In general, in order to prepare salted skin which has good quality, the moisture content of salted skin should be kept not less than 30%.(3) Salted hide (45-50lbs) showed much higher resistance to the damage of drying during storage than salted calf skin, so that the former was slightly damaged even with the strongest drying-up (20% of moisture content).