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Eliminating Curl in Films

IP.com Disclosure Number: IPCOM000092174D
Original Publication Date: 1968-Oct-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Champ, RB: AUTHOR [+2]

Abstract

In fabricating a photoconductive film comprising a flexible substrate such as polyethylene terephthalate or metalized polyethylene terephthalate carrying a photoconductive layer of poly-N-vinylcarbazole with a small percentage, e.g., 40:1 molar ratio, of 2,4,7-trinitro-9-fluorenone, a curl develops in the film. This occurs during drying due to shrinkage of the photoconductive layer by solvent evaporation. Such curl is eliminated by passing the fabricated photoconductive film still containing about 5% solvent in the photoconductive layer over a Mount Hope roll and reverse winding the film on a core so that the coating is on the outside of the roll. Next, the roll is placed in a curing oven at about 40-50 degrees C and allowed to stand for at least 48 hours.

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Eliminating Curl in Films

In fabricating a photoconductive film comprising a flexible substrate such as polyethylene terephthalate or metalized polyethylene terephthalate carrying a photoconductive layer of poly-N-vinylcarbazole with a small percentage, e.g., 40:1 molar ratio, of 2,4,7-trinitro-9-fluorenone, a curl develops in the film. This occurs during drying due to shrinkage of the photoconductive layer by solvent evaporation. Such curl is eliminated by passing the fabricated photoconductive film still containing about 5% solvent in the photoconductive layer over a Mount Hope roll and reverse winding the film on a core so that the coating is on the outside of the roll. Next, the roll is placed in a curing oven at about 40-50 degrees C and allowed to stand for at least 48 hours.

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