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The deliming operation in leather processing is a drum/paddle or pit based operation where two main objectives are met: * Removal of alkali from the pelt and the consequent deswelling of the fibres. * Lowering of the liquor pH to the values used in the bating process. Deliming operations of cattle hides usually last 2 hours and are generally associated with the alkaline phase of beamhouse operations. The progress of deliming in pelts is monitored by the checking of pH values of process liquors and in the cutting of a pelt cross-section. Phenolphthalein is used to monitor deliming pelt cross-sectional progress. ==Removal of pelt alkali and deswelling== * As an acid is added it lowers the pH value of the internal pelt solution. This neutralizes the solution alkalinity. The lowering of the pH results in rapid protonation of the collagen basic groups. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Deliming」の詳細全文を読む スポンサード リンク
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