Process step

%

Products

°C

Running Time

Remarks

100

water  

35

8-9

common salt

°Be=8

1.5-2.0

sodium formate

run 5 mins.

1.0

sodium bicarbonate

run 5 mins.

Loading pickled skins

0.5

Rockol 642

run 60 mins.

PH=4.5

Drain skins and fleshing then weight and loading

10-20

water

35

1.5

Rockol 642

Degreasing (1)

2

Rockol DGS-100

run 90 mins.

Drain

10-20

water

35

2.5

Rockol 642

Degreasing (2)

2-2.5

Rockol DGS-100

run 60 mins

Drain

Washing

100

water

37

0.3

Rockol 642

run 20 mins

2 times

Rinse with °35 water until cleaning skins

Pickling

50

water

25

5

common salt

run 10 mins

°Be>6

1.2

formic acid,85%

2x15+30 mins.

pH =3,3.2

Tanning

4.0

chrome(26/33)

run 60 mins.

0.5-1

Rockol  OFL

3-4      

chrome(26/33)

run 90 mins.

Basification

0.5

sodium formate

run 30 mins.

0.7-1

Rockenal DC  

run 30 mins.

0.4      

Magnesium oxide

run 6.0 hrs

pH =3.8

cut:

light green

drain-horse up (two or more days)-samming-shaving