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DOWELLZYM AL

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DOWELLZYM    AL  
Acid protease 
Chemical & Physical Data:
Composition
Acid protease
Appearance:Brown powder
pH:5-8 (1%)

Properties:
1.DOWELLZYM AL can be applied for bating of hides and skins (bating after normal bating) for bating of pickled pelts , wet blues and the vegetable tanned crust and chrome leather crusts.
2.DOWELLZYM AL opens up of the fiber structure gently and improves softness, fullness and other leather properties, without looseness in the belly.
3.DOWELLZYM AL removes wrinkles and imparts fine & more elastic grain.
4.DOWELLZYM AL improves uptake of tanning agent and even dyeing.
Application:
DOWELLZYM AL can be use for bating of pickled pelts, wet blues and retanned 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 use in the pickle float as a supplementary bating process. DOWELLZYM AL is added 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 24~26C (should not exceed 28C) . 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. 
Treatment timeDosage ( %)
2-3(hrs)1.0-2.5
12-15(hrs)0.5-1.0
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.  The pickled pelts are added in to a float at 6-7Be 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..
Treatment timeDosage (%)
2-3(hrs)1.0-2.5
12-15(hrs)0.5-1.5
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 de-chrome 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 up to 55-60C (in common case, the activity increase with temperature), 1.0%-3.0% DOWELLZYM AL could be added directly into the drum and run for 1~2hrs, then set the drum to run on a timer automatically for a total treatment time of 4~24hrs. 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:
Avoid breathing dust and contact with skin, excessive contact may cause anaphylactic reaction. If splashed into eyesimmediately wash with plenty of water. 
Packing:
25kg double-deck plastic bag
Storage:
This product has a shelf life of 1 year 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

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