Browse Prior Art Database

Coating of Highly Viscous Material

IP.com Disclosure Number: IPCOM000044890D
Original Publication Date: 1983-Jan-01
Included in the Prior Art Database: 2005-Feb-06
Document File: 3 page(s) / 41K

Publishing Venue

IBM

Related People

Franey, TE: AUTHOR [+3]

Abstract

Material so viscous as to be generally immobile under the influence of gravity alone is coated using three rolls having tangential velocities in the ratio of 3 (for the metering roll) to 10 (for the applicator roll) and 70 (for the back-up roll), with a gap between the metering roll and the applicator roll.

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Coating of Highly Viscous Material

Material so viscous as to be generally immobile under the influence of gravity alone is coated using three rolls having tangential velocities in the ratio of 3 (for the metering roll) to 10 (for the applicator roll) and 70 (for the back-up roll), with a gap between the metering roll and the applicator roll.

Roll 1 in the drawing is the supply roll of high density polyethylene sheet 2 of about 10 microns in thickness. Roll 1 is unwound to feed sheet 2 through a coating and curing process. Sheet 2 passes through a coating station 3.

Coating station 3 comprises a meter roll 5, which is driven clockwise, an applicator roll 7, which is driven counterclockwise, and a back-up roll 9, which is driven clockwise. The rolls 5, 7 and 9 are linked to a positively infinitely variable (PIV) gear box 11. The PIV 11 is a standard, commercially available system having a gear system which effectively resists one roller being driven by an adjoining roller. Instead, each roller is driven at a speed dictated by the PIV 11.

In a typical application rolls 5, 7 and 9 are 10 inches (about 0.254 meter) in effective width (face width). Rolls 5 and 7 are 8-inch (about 0.203 meter) outside diameter rolls of standard chrome steel (steel body coated with chromium). Roll 9 is 8 inches (about 0.203 meter) in outside diameter of rubber having a durometer measurement of 60. The three rolls 5, 7 and 9 are horizontal.

Metering roll 5 and applicator roll 7 have perimeters separated at their closest point by 0.003 inch (about 0.0000762 meter), forming a gap into which coating material is injected by nozzle 15, positioned between and above rolls 5 and 7.

Applicator roll 7 is mounted to apply a pressure of 30 lbs. per inch (about 345 grams per meter) of roll face width against the sheet 2 at the nip of roll 7 and roll 9, resulting in 300 lbs. (about 3450 grams) total pressure at the face between roll 7 and roll 9.

Sheet 2 passes through coating station 3 and then extends through curing station 17, shown entirely illustratively, where the coating material is solidified. Sheet 2 then passes over an automatic web guide 21 (a well-known, commercially available element comprising a roller mounted to move laterally with the web, as suggested illustratively in the drawing).

Sheet 2 then passes around two, spaced pull rolls 23 and 25, which are driven to pull sheet 2, as is conventional. L...