Vegetable tanning of Sheep and Goat skin

Rapid tannage of fresh, wet salted, dry salted and sun dried sheep and goat skins with Mimosa extract outline process:

Soaking

Fresh and wet salted skin

Wash for short time in pit or drum- changing the water once.

Dry salted skins soak in pit for 3 hours

                                     500 % float on dry saltd weight

                                     0.5 % Caustic Soda on dry salted weight

Take out, reverse order, put in back order

                    Leave Over Night

Take out reverse order, put back in pit for 1 hour

Sun Dried skin

Soak in pit for 4 hours

                                      1000 % float on dried skin weight

                                       1 % Caustic Soda on dried skin weight

 Take out reverse order, put back in pit for 1 hour

After soaking stretch by hand or machine (this is very essential for dry salted and sun dried skin)

Liming

Painting-prepare a 12 ° Be` solution of sodium sulphide and make strength up to 25 ° Be` with water and lime  

Skin painted on flesh side, piled 4-5 hours then unhaired and placed in pit

                              200 % water on drained soak weight

                             10-15 % lime on drained soak weight

                             Unhair after 2 days

Flesh

Reliming

                     200 % water on drained soak weight

                     10-15 % lime on drained soak weight

                    Leave 3- 4 days, scud, reflesh and weigh. 

Deliming

                   In drum, not more than 3- 4 r.p.m

                  200 % water   or     200 % water

                  0.5 % ammonium chloride    0.5 % sodium bi sulphite   

                  1 % orpon or pancresol           1 % orpon or pancresol     

Run 1.5 -2 hours

Goat skin may require 0.5 to 1 hour longer

Scud        

Wash for 20 minutes with running water sodium bi sulphite tends to yield a cleaner

Pelt than with ammonium chloride

Pickling

In drum, not more than 3-4 r.p.m

                70 % water         or     70 % water

                  6 % salt                    6 % salt

                  1 % formic acid       0.5 % sulfuric acid

Run 1 hour

Add 2- 5 % syntan (oveosyn Cp, tanigan CH or other pretanning syntan)

Drain off float and proceed with tanning

Tanning

Tan in same drum with 30 % solid Mimosa or 27 % powder Mimosa

Dissolved in own weight of water adding the tanning solution through hollow axle in four installment at 30 40 intervals. Drum 4 – 5 hours after last addition at not more than 3 – 4 r.p.m.

Pilling is very necessary to obtain fixation.

 Fat liquor

Weigh, wash in drum with running water for 20 – 30 minutes and fat liquor with 100 % water

                     1 % sulphonated oil for sheep

                     1.5 – 2 % sulphonated oil for goat

Horse overnight, sammyed and set out, etc.