The purpose of dehairing animal hides is to remove all animal hair and allow the hide surface to be processed without hindrance. In leather production, the dehairing process takes place after liming and before fleshing.
Additional sources: https://wp.selbstsorger.de/handwerkliches/gerben/enthaaren/, https://www.lederzentrum.de/wiki/index.php/%C3%84schern, accessed on: 29.05.2018.