form) Drum 2hrs 0.3% Magnesium oxide (fine powder) 0.3-0.5% Sodium acetate (1:5) Drum 2hrs Drum 2hrs. Float pH 3.6-3.8 –The 0.3-0.5% Sodium acetate (1:5) end pH is normally kept below 4.0 30 H2O @35oC Drum 60-90mins –40% up or pile overnight. Sammying, setting, splitting (1.8 -2.0mm) and shaving. shaved weight Washing of 200% H2O @40oC. sometimes small shaved additions (0.1-0.2%) of formic, leather acetic Drum 30mins or oxalic is added to remove Cr stains 150% H2O @35oC Drum 45mns 1.5% Naphthalene sulphonic acid condensate pH 1.7 200% H2O @20oC (cold wash) Wash Drum 10mins drain 200% H2O @40-45oC (hot wash) Wash Drum 10mins drain 100% H2O @45oC Dye Drum 1% dye leveling syntan 1% suitable dye Drum 30mins Fatliquoring 1.5% sulphited fish oil 1.5% raw groundnut oil 1.5% Cationic fatliquor (50%) Drum 30mins 2% egg yolk (or substitute) 1% china clay 2% Phenolic retanning, dispersing syntan Drum 1hr. Check pH 2% Mimosa extract 3.5/3.6 then horse up 2% chrome crystal 33% basic (dissolved in a little water) all added in a single feed
form) Drum 2hrs 0.3% Magnesium oxide (fine powder) Drum 2hrs 0.3-0.5% Sodium acetate (1:5) 0.3-0.5% Sodium acetate (1:5) Drum 2hrs. Float pH 3.6-3.8 –The end pH is normally kept below 4.0 30 –40% H2O @35oC Drum 60-90mins up or pile overnight. Sammying, setting, splitting (1.8 -2.0mm) and shaving. shaved weight Washing of 200% H2O @40oC. sometimes small shaved leather additions (0.1-0.2%) of formic, acetic Drum 30mins or oxalic is added to remove Cr stains 150% H2O @35oC Drum 45mns 1.5% Naphthalene sulphonic acid condensate pH 1.7 Wash 200% H2O @20oC (cold wash) Drum 10mins drain Wash 200% H2O @40-45oC (hot wash) Drum 10mins drain Dye 100% H2O @45oC Drum 1% dye leveling syntan 1% suitable dye Drum 30mins Fatliquoring 1.5% sulphited fish oil 1.5% raw groundnut oil 1.5% Cationic fatliquor (50%) Drum 30mins 2% egg yolk (or substitute) 1% china clay 2% Phenolic retanning, dispersing syntan Drum 1hr. Check pH 2% Mimosa extract 3.5/3.6 then horse up 2% chrome crystal 33% basic (dissolved in a little water) all added in a single feed
JLS%20200%20Leather%20technology%201%20notes.docx