Description
Surface treatment is preferred, as it offers wide versatility
in location and equipment while providing a less expensive and more
easily controlled application than internal treatments.
Treatment Level
Treatments can be made to one side or both sides of the paper
or paperboard. The concentration of Repel-P required for a given
degree of oil or grease holdout depends upon several
factors:
- The oil or grease being held out
- Time and conditions for holdout
- Nature of the fiber finish
- Presence of other chemicals on the sheet
- Papermaking variables, such as stock freeness, density, and
degree of calendering
In most cases, the greater the amount of fluorochemical on the
surface of the treated paper or paperboard, the greater the oil and
grease repellency. Variations in alum, filler, size, starch, and
other sheet or treatment parameters may affect holdout. For an
initial trial, the recommended rate is *1 lb Repel-P as received
per metric ton.
Solution pH
The treating solution pH has little effect on Repel-P over a
pH range of **7.5. Performance is slightly better for solutions of
pH 6.5.
