Another press on Bidspotter.com this month that I’ve been repeatedly asked about is a Vandercook 15-20 Dry Offset press. Dry offset refers to the absence of water in the inking system. The process is used to print plastic containers and lids, cosmetic tubes, aluminum cans, etc. Dry offset ink is cured onto the substrate using ultra-violet light.
“Developed expressly for the production of printed circuits, nameplates and dials by the dry offset process. It will print from positive letterpress plates or forms on metal, glass, plastic cardboard, paper, and practically any other flat material up to 1-inch in thickness.” A production press (not a proof press). Both plate and work beds adjustable from 1.100″ to .600″. Powered cylinder and ink drum. 400 cycles/hour (= 9 secs/cycle). Optional vacuum base and grippers.
The inking system is identical to the 15-21, which has the old style bottom frame form rollers. What I’m not clear about is feeding. If there is no feed board or grippers material was laid directly on the bed? But since grippers were optional, a No. 4 or 15-21 gripper bar could be mounted to the cylinder. A feed board could then be fabricated. Has anyone had experience on such a press?
The 15-20 was in production from 1955 to 1962. The serial number is 50085, which according to the serial numbers table means that it had been rebuilt at the factory in 1965. This is the only know example of this model.