Browse Prior Art Database

Solvent Recovery System

IP.com Disclosure Number: IPCOM000080930D
Original Publication Date: 1974-Mar-01
Included in the Prior Art Database: 2005-Feb-27
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Kotla, JJ: AUTHOR

Abstract

This is a method of reclaiming solvent used in the manufacture of letter-press cylinders and plates from polymeric material, such as BASF's Nyloprint.

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Solvent Recovery System

This is a method of reclaiming solvent used in the manufacture of letter- press cylinders and plates from polymeric material, such as BASF's Nyloprint.

In the process as currently practiced, the solvent (such as ethanol) etches away those portions of the Nyloprint plate which have not been exposed to actinic radiation, inasmuch as the uncured (i.e., unexposed) polymer is soluble in ethanol while the cured (i.e., exposed) polymer is not. The solvent currently is used in this manner until it is saturated in soluble polymer; whereupon it must be replaced with new solvent.

It has been found, however, that the ethanol solvent can be reclaimed by making the solvated polymer insoluble in it by exposing the saturated solution of polymer in ethanol to actinic radiation. When thus exposed, the polymer cures and precipitates out of solution so that it can be removed by simple mechanical filtering devices, leaving behind a fairly pure grade of solvent capable of further use in the above-described process.

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