International School of Tanning Technology

MODULE 5 CURRICULUM

the correct process sequence for miscellaneous tannages

the role of each stage

how each stage is monitored and controlled

the chemicals involved and possible substitutes

the quality improvement or damage that occurs during miscellaneous tannages

machinery specific to miscellaneous tannages

vegetable tanning

mechanism of tanning

principle of filling

filling and variations obtained for different degrees of filling

discussions include clearing, bleaching, stripping, filling

principles of semi-alum tannage

clearing

principle of ion complexation

chemicals used and possible substitutes

technology of good clearing

bleaching

principle of tannin lightening through sulphonation of tannins

stripping

principle of alkali addition to release surface-bound tannins

filling

inert filling through passive retention


chamois

mechanism of hydroperoxide and peroxide formation and aldehyde tannage

oxidation of high iodine value oil

penetration of raw oil into skin

aldehyde pre-tannage principle to improve oil penetration

scouring to remove excess oil

terms such as frizing, skiver, acrolein, degras, moellon, through-shot buffing


furriery

structure of hair/wool and hair/wool types

lanolin as a hair associated fat

hair root structure and hair tightening

scouring of hair/wool

bleaching of hair/wool

removal of glycosaminoglycans and fibre bundles with acidic conditions

shearing, combing, ironing

deburring


organic tanning

new theory of tanning

use of organic materials to stabilise collagen

riempie manufacture


chrome-free tannage

zirconium

aluminium

titanium III & IV

sodium aluminium silicates

iron

silicon dioxide