Acid protease

Chemical & Physical Data:

Composition:          Acid protease

Appearance:          Beige powder

pH(1%):                  5.0~8.0

Properties:

lDOWELLZYM AL can be applied for bating of hides and skins (bating after normal bating) or for bating of pickled pelts , wet blues and the vegetable tanned crust and chrome leather crusts.

lDOWELLZYM AL opens up the fiber structure gently and improves softness, fullness and other leather properties, without looseness in the belly.

lDOWELLZYM AL removes wrinkles and imparts fine & more elastic grain.

lDOWELLZYM AL improves uptake of tanning agent and even dyeing.

Application:

lDOWELLZYM AL can be used for bating of pickled pelts, wet blues and re-tanned crust by adding directly without dissolving in water, the bating pH should be adjust at the range of 2.5-5.0 .

A) Multiple bating

After the normal bating process, DOWELLZYM AL can be used in the pickled float as a supplementary bating process. Add DOWELLZYM AL together with common salt at the beginning of pickling and run 10-20minutes, then adjust the pH to 3.0-5.0 with formic acid and control the float temperature in the range of 24-26°C (should not exceed 28°C) .

 After acid bating is completed add more acid to lower the pH and run until the desired pH is achieved prior to the addition of Chrome tanning.

B) On pickled pelts

Pickled pelts that have not been bated enough in the previous processes could be re-treated with DOWELLZYM AL. It can help to open up the fibre structure further and reduce or eliminate the wrinkles, creases & folds created during the storage.  

Add pickled pelts into a float at 6-7°Be of common salt, and adjust pH to 3.0-5.0 with sodium bicarbonate. Then add DOWELLZYM AL and run until the desired effect is achieved. After the bating treatment, add acid to lower the pH of the float to a level required for the chrome tannage..

C) On wet blues or crusts

DOWELLZYM AL can also be applied on wet blues or crusts to get further improvement in wetting, softness, fullness and remove wrinkles etc. Before the addition of DOWELLZYM AL, it is better to rinse and wash the wet blues or crusts thoroughly. The pH of the wet blues or crust is adjusted to 3.0-5.0, and temperature is controlled at 45°C (in common case, the activity increase with temperature).Add 1.0%-3.0% DOWELLZYM AL directly into the drum and run for 1-2 hours, then set the drum to run on a timer automatically for a total treatment time of 4-24 hours. DOWELLZYM AL can be applied directly  in powder form(if it is diluted, add immediately to avoid drop in enzyme activity), if other chemical required to be added, they should be added after 30 minutes running with DOWELLZYM AL to avoid the affect from high concentration of chemicals. 

Safety:

Enzyme is a kind of protein, contact may cause anaphylactic reaction; avoid breathing dust and contact with skin. If splashed into eyes, immediately wash with plenty of water.

Packing:

25KG plastic woven bag

Storage:

This product has a shelf life of 2 years if it is stored in its tightly sealed original packaging at temperature below 25℃. Bags should be tightly resealed each time after material is taken from them, and their contents should be used up as soon as possible after they have been opened. Non-dangerous chemical.