Method and apparatus for producing printing patterns

A method of producing printing patterns using a liquid photosensitive resin, comprising the steps of mounting a transparent surface in spaced parallel relation to a generally vertical supporting plate to provide a closed chamber therebetween, introducing a liquid uncured photosensitive resin into said chamber, exposing said resin in the chamber to ultra-violet light for a sufficient period of time to partially cure the resin and provide a partially cured backing sheet, removing the transparent surface from engagement with the backing sheet, mounting a photographic negative on said transparent surface and positioning said transparent surface in spaced relation with said supporting plate to provide a second closed chamber therebetween having a greater depth than said first chamber, aligning said negative with said backing sheet, introducing a liquid uncured photosensitive resin into said chamber, exposing a portion of said resin through said photographic negative to ultra-violet light to thereby cross-link said portion and provide a hardened pattern having offset indicia, removing the pattern from the second chamber, and removing the uncured resin from the pattern.

A method of producing a printing pattern through use of a liquid uncured photosensitive resin, comprising the steps of disposing a pair of transparent sheets in spaced parallel relation to provide a chamber therebetween, positioning a photographic negative within the chamber against a first of said sheets, introducing resin into the chamber to cover the negative with said resin, positioning the second sheet adjacent a source of ultraviolet light to cure a thin layer of resin adjacent said second sheet while retaining a substantial portion of the resin within the chamber in an uncured state, positioning the first sheet adjacent the ultra-violet light source to expose said uncured resin through said photographic negative to said light to thereby cure the exposed portions to said resin and provide a hardened pattern having offset indicia, and removing the remaining uncured resin from the pattern.

A method for producing a printing pattern through use of a liquid uncured photosensitive resin, comprising the steps of disposing a transparent plate and a backing plate in spaced parallel relation to form a chamber therebetween, forming a thin layer of a cured photosensitive resin in said chamber against the inner surface of said backing plate, positioning a photographic negative against the inner surface of said transparent plate, exposing portions of a liquid uncured photosensitive resin in said chamber through said negative to ultra-violet light to cure said portions and provide a hardened pattern having offset indica, and removing the remaining unexposed portion of said liquid uncured resin from the pattern.