Preparation of Sheepskin Unhairing Extracts from Locally Available Plants: Cleaner Leather Processing

Table 7

Conventional recipes for the unhairing process (Hair-burning method).

Conventional recipes for unhairing process
Process	Weight (%)	Weight (kg/L)	Chemical	Time (minutes)	Temp (°C)	pH	Drum (rpm)
Pre-soaking	300	3	Water	10′	25	8.5	2-3
	300	3	Water	10′
Main-soaking	300	3	Water	10′		9
	0.5	0.05	Wetting agents	O/N
	1	0.05	Soda ash
	1	0.5	Buzume 1448
Liming	300	3	Water				2-3
	5	0.15	Lime	Run 10 min every 2 h, and left overnight.		11
	3	0.09	Sodium sulfide
	5	0.05	Lime	1 hour
	0.1	0.1	Caustic soda