ENZYMATIC DE-SIZING AGENT FOR CONTINUOUS RANGES

AVCOZIM US is a thermo-stable alpha-amylase enzyme which has excellent heat stability in the high temperature range, AVCOZIM US is breaking down starch and starch derivative sizing agents within a short reaction time.
AVCOZIM US is designed for continuous ranges composed of steam chambers, and for continuous washers.

SPECIFICATION:

Appearance	Brown liquid with characteristic odor.
Chemical nature	Bacterial alpha-amylase, heat stable.
Compatibility	Should not be used in pH exceeding the pH range of 7-9. Can be used with hard water. Copper, zinc and their salts as well as chlorine and other oxidizing agents impair the effectiveness of AVCOZIM US.
Solubility	Miscible with water in any ratio.
Storage stability	Store the product in closed containers in cool place. Once the containers have been opened, the contents should be used immediately. Storage for prolonged periods at temperatures over 30°C causes loss of activity. When stored in suitable conditions, shelf life is at least 6 months.

PROPERTIES & USES:

AVCOZIM US is a de-sizing agent which retains its activity at relatively high
temperatures. The maximum breakdown is achieved in the temperature range of 90°C
to 100°C.
AVCOZIM US causes no damage to the fibres.
AVCOZIM US is stable in hot wash boxes at 90-100°C.
AVCOZIM US is stable in high temperature steamers at 100-102°C.
AVCOZIM US breaks down starch molecules in a short reaction time (2-3 minutes in the
steamer).
AVCOZIM US is used for continuous desizing in pre–treatment steamer and in open
width continuous washers.

APPLICATION:

The quantities and treatment time depends on the type of fabric and de-sizing method. General suggestion is 4 – 8 g/l.
At the stage of de-sizing it is desirable to remove all additives incorporated in the sizing such as waxes, paraffins and all soiling and staining results from fabric weaving. It is therefore important to add an emulsifying and dispersing agent with high wetting power and compatibility with enzymes. Such products are AVCO-BIOPAL LFB, AVCO-BIOLIT 2090 and AVCO-BIOLUZE G-1099.
The solubilized size must be washed out before the cloth goes to bleaching and dyeing. Best results are achieved by alkaline boiling (3-5 cc/l Caustic Soda 50%) with a complexing/dispersing agent such as AVCO-POLYQUEST PDK.
Preparation of the treatment solution:
- If there is no preliminary washing process, add a suitable detergent and wetting agent.
- The pH should be adjusted in the range of 6.5 – 8.
- Add the appropriate quantity AVCOZIM US.
Continuous desizing in an open – width washer

In the first 2 -3 washing compartments (depending on the feed and speed of the goods) add the following:

AVCOZIM US 5 – 10 g/l
AVCO-BIOLUZE G-1099 3 – 5 g/l

The reaction time in the enzyme liquors should be at least 40-50 seconds at a temperature of 90° C. The goods are then washed in hot water. Addition of 2 g/l AVCO-POLYQYEST PDK and 3 cc/l caustic soda (50%) to the first hot washing compartment improves the desizing effect.
Short-time desizing in the pre-treatment steamer

Pad with:

AVCOZIM US 4 – 8 g/l
AVCO-BIOLIT 2090 3 – 5 g/l
AVCOTRYL PN 1 – 3 g/l
Liquor pick-up 80%, steaming 2-3 minutes at 100°C.
Washing: hot, warm and cold.

Addition 1-3 cc/l Caustic Soda (50%) to the first hot washing compartment improves the desizing effect.

TESTING FABRICS FOR THEIR DEGREE OF DE-SIZING:

Preparation of iodine solution:
Dissolve 10 gr. of Potassium Iodide (KI) in 100 ml. of water add 0.635 gr. of Iodine and shake well. Top up with water to 800 ml. and finally add Ethanol to reach 1litre.

According to the TEGEWA – violet scale for assessing the de-sizing degree of starch, immerse a de-sized fabric sample (which is pre-rinsed in hot alkaline and cold water) in the Iodine solution for a period of about 1 min.
After immersion rinse shortly in water damp with filter paper and compare immediately with the violet scale.

Judge according to the following results:

Pure dark blue coloration = presence of non-degraded starch.

Pale blue coloration = slight starch residue on the fibre.

Red-violet coloration = starch degraded to water soluble dextrin.

Yellow coloration = complete freedom from starch.

Degradation into a-reddish – violet color is adequate for solid shades.