SKHZYE-DPE91 is an enzyme complex that selectively modifies cellulosic fibers to aid in the separation of ink and other debris from recycled papers. SKHZYE-DPE91 is in powdered form and will operate in broad range of pH 5–8 and temperature 25 o C–60 o C
When applied as directed in this bulletin, SKHZYE-DPE91can help to accomplish the following:
1.Decreases the need for pulping chemicals such as soda, peroxide and silicate.
2.Reduces black spots from both thermochemical inks and oil based inks.
3.Reduces stickies through dispersion.
4.Increases in whiteness and brightness of up to 3 points.
5.Improves softness due to easier fiber rewetting and swelling.
6.Reduces fines leading to cleaner white water loops.
7.Improves paper strength properties.
8.Improves paper formation and drainability leading to either the reduction of steam demand for paper drying or conversely increases in the paper machine speed and runnability.
9.Reduces COD level in waste water treatment and therefore the reduction of the chemical load in the treatment of the aforementioned waste water.
Appearance: Tan to light yellow powder (Note that color does not affect or reflect activity.)
Odor: Slight fermentation odor
Solubility: Miscible with water
pH (1% solution): 4.5 + 1.0
SKHZYE-DPE91 is added at a dosage between 20-50 g/ton (metric ton) of dry pulp. We have found a general optimum at 30 g/ton. Contact your representative for further assistance in determining optimal dosage for your mill. The enzymatic treatment is best at the digester (wastepaper repulper).
SKHZYE-DPE91 can be inactivated by raising the pH above 11.0 or temperature above 71 o C (160 ºF) or a combination of the two. Oxidizers such as peroxide and hypochlorite can also be used to inactivate the enzyme. In the pulp and paper process, SUKADEN-91 is inactivated in the dryers at the paper machine. No residual enzymatic activity will be found in the manufactured paper.