| 摘要 |
A process for the production of scratch-off cards, based on offset-lithographic printing, is disclosed. The process comprises applying printed matter to a base by means of at least one set of rollers, then applying a wax-like release layer of oleoresinous release varnish onto at least one area of said printed matter by means of at least one other set of rollers, and then applying an opaque coating over said release layer by means of at least one further set of rollers. The release layer is preferred to be transparent, and to comprise an oleamide wax and a polyethylene wax that provide a surface-active ingredient to induce release of the opaque coating from over the printed matter. The wax-like oleoresinous release material may have other applications. |
