Liquid trapping means for a film unit

Abstract

Abstract FOR TRAPPING AND RETAINING THE EXCESS PROCESSING FLUID DISTRIBUTED BETWEEN AN EXPOSED PHTOTSENSITIVE SHEET AND A SECOND SHEET SUPERPOSED THEREWITH WHEN THE TWO ARE MOVED LONGITUDINALLY BETWEEN A PAIR OF PRESSURE APPLYING MEMBERS TO RUPTURE A POD CONTAINING AN AMOUNT OF PROCESSING SOLUTION IN EXCESS OF THAT REQUIRED TO PROCESS THE EXPOSED LATENT IMAGE, THE TRAILING END OF ONE OF THE SHEETS IS EXTENTED BEYOND THE IMAGE AREA THEREOF AND IS MEDIALLY FOLDED BACK UPON ITSELF TO PROVIDE A FLAP THE FREE END OF WHICH WILL EXTEND BACK AT LEAST TO THE TRAILING END OF THE OTHER SHEET, AND PROBABLY BEYOND AND UNDER THE TRAILING END OF THE OTHER SHEET, TO FORM A TRAP FOR THE EXCESS PROCESSING FLUID. THE SHEET WHOSE TRAILING END IS FOLDED BACK TO FORM THE TRAP SHOULD BE MADE OF MATERIAL HAVING SUFFICIENT RIGIDITY AND/OR RESILIENCE THAT IT RESISTS FOLDING SO THAT THE FREE END OF THE FOLDED-BACK FLAP NORMALLY REMAINS SPACED FROM THE SHEET PROPER TO FROM AN OPEN MOUTH FOR RECEIVING EXCESS PROCESSING FLUID. THE LONGITUDINAL EDGES OF THE FOLDED-BACK TRAP ARE SEALED TOGETHER IN SUCH A WAY AS TO PREVENT THE FLOW OF PROCESSING FLUID FROM THE EDGES BUT TO ALLOW THE ESCAPE OF AIR THEREFROM. AT LEAST ONE PROTUBERANCE IS EMBOSSED IN EACH OF THE SEALED EDGES TO EFFECT A SIGNIFICANT SEPARATION OF THE PRESSURE APPLYING MEMBERS AS THE TRAP PASSES THEREBETWEEN WHEREBY THE FOLDED-BACKED FLAP WILL NOT BE COMPRESSED SUFFICIENTLY TO CAUSE A BACK FLOW OF ANY FLUID WHICH HAS ENTERED THE TRAP.

Inventors

• 👤 Stanley R Schieven

Bibliographic Details