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DOWELLZYM AH

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

Properties:
1.DOWELLZYM AH can be applied for acid bating of hides and skins (the bating after normal bating), for bating of pickled pelts, wet blues and the crust retanned with vegetable and synthetic tanning agents.
2.It gives very fine, flat much clear and elastic grain.
3.Mildly opening up of the fiber, improve softness, fullness without looseness in the belly.
4.It removes wrinkles and gives a more fine and elastic grain.
5.Improve uptake of tanning / retanning agents and even dyeing.
Application:
DOWELLZYM AH can be used for bating of pickled pelts, wet blues and retanned crust .by adding directly in powder form at the range of pH 4.5~7.0 . 
A) To treat the tough grain of goatskin & buffalo hide etc.
After normal bating, adjust pH to 6.0-6.5 with formic acid and then add DOWELLZYM AH for grain bating. The dosage of DOWELLZYM AH depends on the raw materials and the leather types. Suggest dosage is 0.2% -1.0% .
B) Applied in pickling
At the beginning of pickling, adjust pH to 4.5-6.5, then treat with DOWELLZYM AH . The temperature should not exceed 28C. Add acid to adjust pH of the float to meet the pickling requirements after DOWELLZYM AH bating.
Treatment timeDosage ( %)
2-3 hrs1.0-2.5
12-15 hrs0.5-1.5

C) On pickled pelt
DOWELLZYM AH can also be applied on the pickled pelts which have been bated insufficiently or become too dry after prolong storage and to remove wrinkles, fold marks and creases. Add the pickled pelts into 6-7 Be common salt float, adjust pH to 4.5-7.0. The temperature should not exceed 28C. and add DOWELLZYM AH for acid bating followed by re acidify the float to the required pH level for chrome tanning process.

Treatment timeDosage( %)
2-3 hrs1.5-2.5
12-15 hrs1.0-2.0
D) On wet blues or crusts
DOWELLZYM AH can also be applied on wet blues or crusts to get further improvements. Before adding DOWELLZYM AH, it is better to detanning slightly with oxalic acid and wash the wet blues or crusts thoroughly. Then adjust the pH to 4.5-7.0, and temperature is controlled between 45-55C, 2.0%-4.0% (w/w) DOWELLZYM AH could be added into the drum run for 1~2hrs, then run automatically, the total treatment time could be 10~24hrs . 
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 their contents should be used up as soon as possible after they have been opened. Direct contact with this product may irritate skin and mucous membranerinse with running water if contacted with skin. Non-dangerous chemical.

 

 

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