Spreadsheets Developed by E. B. Gutoff To Predict The Drying Of Coated Webs
DRYWEB:
This is a large spreadsheet which accurately predicts the temperatures and solvent
levels throughout the constant and falling rate periods, including the initial
transients. It handles mixed solvents and also infra-red heaters. One or two experimental
runs are enough to determine the adjustable constants. Thirty-eight solvents including
water are now in the database. Macros make it easy to change solvents, move the
ir section in or out, change the number of dryer zones, switch between SI and
English units, and switch between air pressures and velocities
DRYWEBPS
and DRYWEBPU :
These are modified versions of DRYWEB for coatings on porous webs. One
version assumes the coating completely penetrates the web; the other that the
coating is completely on top of the web. One or the other should model any coating
on a porous web.
DRYWEBTW:
This is a modified version of DRYWEB for coatings on thick webs,
where the temperature can no longer be assumed uniform across the web in any one
section.
CRDRY:
This is a small spreadsheet for aqueous systems. It accurately predicts the location
of the end of the constant rate period. This is a useful control point, as in
aqueous systems most of the drying is in the constant rate period. CRDRY
also gives web temperatures and solvent levels at the end of each constant rate
zone.
CRDIR
:
This is similar to CRDRY but can handle infra-red heaters
Spreadsheet Developed by E. B. Gutoff
For Use In Designing Coating Dies
DIEDESIN calculates the cross-web
uniformity for proposed uncorrected dies with straight (not tapered) rectangular
rear channels, the correction needed to give complete coverage uniformity, and
also the channel pressure. A number of different geometries should be tested before
"choosing the best" design.
Spreedsheets Developed by E. B. Gutoff
and P. J. Frost for Statistical Process Control of Roll Products
ROLLSPC and RUNSUM
generate all desired SPC charts and statistics. For info please go to www.pjassociates.com