Stencil printing process

Claim 2

A PROCESS FOR APPLYING A PREDETERMINED COLORED CONFIGURATION TO A POROUS SHEET MATERIAL WHICH COMPRISES APPLYING SUCTION TO ONE SIDE OF SAID POROUS SHEET MATERIAL, APPLYING TO THE OPPOSITE SIDE OF SAID SHEET MATERIAL A LIQUID IN WHICH A PREDETERMINED COLORING COMPOSITION IS AT LEAST PARTIALLY SOLUBLE, THEREAFTER BRINGING THE SIDE OF SAID SHEET MATERIAL TO WHICH SAID LIQUID WAS APPLIED INTO CONTACT WITH A STENCIL SCREEN HAVING PERVIOUS PORTIONS CORRESPONDING IN SHAPE TO SAID PREDETERMINED COLORED CONFIGURATION, SUPPLYING SAID PREDETERMINED COLORING COMPOSITION TO SAID PERVIOUS PORTIONS OF THE SIDE OF SAID SCREEN REMOTE FROM SAID SHEET MATERIAL, SAID COLORING COMPOSITION BEING A HEAVY CONCENTRATED NON-FLOWING PRINTING INK WHICH IS SUFFICIENTLY VISCOUS TO REMAIN ON ONE SIDE OF THE STENCIL SCREEN UNDER NORMAL ATMOSPHERIC CONDITIONS BUT WHICH WILL FLOW THROUGH THE PERVIOUS PORTIONS OF THE STENCIL SCREEN WHEN THE PRESSURE ON THE OPPOSITE SIDE OF THE STENCIL SCREEN IS REDUCED, APPLYING ADDITIONAL SUCTION BETWEEN SAID STENCIL SCREEN AND SAID SHEET MATERIAL, AND CONTINUING TO APPLY SAID FIRST NAMED SUCTION AND SAID ADDITIONAL SUCTION FOR A BRIEF INTERVAL UNTIL SAID COLORING COMPOSITION HAS BEEN DRAWN THROUGH THE PERVIOUS PORTION OF SAID SCREEN AND PRINTED ON THE SURFACE OF SAID SHEET MATERIAL.

Claim 3

A PROCESS FOR APPLYING A PREDETERMINED COLORED CONFIGURATION TO A POROUS SHEET MATERIAL WHICH COMPRISES APPLYING SUCTION TO ONE SIDE OF SAID POROUS SHEET MATERIAL, APPLYING TO THE OPPOSITE SIDE OF SAID SHEET MATERIAL A LIQUID IN WHICH A PREDETERMINED COLORING COMPOSITION IS AT LEAST PARTIALLY SOLUBLE, THEREAFTER BRINGING THE SIDE OF SAID SHEET MATERIAL TO WHICH SAID LIQID WAS APPLIED INTO CONTACT WITH A STENCIL SCREEN HAVING PERVIOUS PORTIONS CORRESPONDING IN SHAPE TO SAID PREDETERMINED COLORED CONFIGURATION, SUPPLYING SAID PREDETERMINED COLORING COMPOSITION TO SAID PERVIOUS PORTIONS OF THE SIDE OF SAID SCREEN REMOTE FROM SAID SHEET MATERIAL, SAID COLORING COMPOSITION BEING A HEAVY CONCENTRATED NON-FLOWING PRINTING INK WHICH IS SUFFICIENTLY VISCOUS TO REMAIN ON ONE SIDE FO THE STENCIL SCREEN UNDER NORMAL ATMOSPHERIC CONDITIONS BUT WHICH WILL FLOW THROUGH THE PERVIOUS PORTIONS OF THE STENCIL SCREEN WHEN THE PRESSURE ON THE OPPOSITE SIDE OF THE STENCIL SCREEN IS REDUCED, APPLYING ADDITIONAL SUCTION BETWEEN SAID STENCIL SCREEN AND SAID SHEET MATERIAL, CONTINUING TO APPLY SAID FIRST NAMED SUCTION AND SAID ADDITIONAL SUCTION FOR A BRIEF INTERVAL UNTIL SAID COLORING COMPOSITION HAS BEEN DRAWN THROUGH THE PERVIOUS PORTION OF SAID SCREEN AND PRINTED ON THE SURFACE OF SAID SHEET MATERIAL, DISCONTINUING THE APPLICATION OF SAID ADDITIONAL SUCTION, REMOVING SAID STENCIL SCREEN FROM SAID SHEET MATERIAL, AND THEREAFTER DISCONTINUING SAID FIRST SUCTION.

Claim 4

A PROCESS FOR APPLYING A PREDETERMINED COLORED CONFIGURATION TO A POROUS SHEET MATERIAL WHICH COMPRISES APPLYING SUCTION TO ONE SIDE OF SAID POROUS SHEET MATERIAL, APPLYING TO THE OPPOSITE SIDE OF SAID SHEET MATERIAL A LIQUID IN WHICH A PREDETERMINED COLORING COMPOSITION IS AT LEAST PARTIALLY SOLUBLE, THEREAFTER BRINGING THE SIDE OF SAID SHEET MATERIAL TO WHICH SAID LIQID WAS APPLIED INTO CONTACT WITH A STENCIL SCREEN HAVING PERVIOUS PORTIONS CORRESPONDING IN SHAPE TO SAID PREDETERMINED COLORED CONFIGURATION, SUPPLYING SAID PREDETERMINED COLORING COMPOSITION TO SAID PERVIOUS PORTIONS OF THE SIDE OF SAID SCREEN REMOTE FROM SAID SHEET MATERIAL, SAID COLORING COMPOSITION BEING A HEAVY CONCENTRATED NON-FLOWING PRINTING INK WHICH IS SUFFICIENTLY VISCOUS TO REMAIN ON ONE SIDE FO THE STENCIL SCREEN UNDER NORMAL ATMOSPHERIC CONDITIONS BUT WHICH WILL FLOW THROUGH THE PERVIOUS PORTIONS OF THE STENCIL SCREEN WHEN THE PRESSURE ON THE OPPOSITE SIDE OF THE STENCIL SCREEN IS REDUCED, APPLYING ADDITIONAL SUCTION BETWEEN SAID STENCIL SCREEN AND SAID SHEET MATERIAL, CONTINUING TO APPLY SAID FIRST NAMED SUCTION AND SAID ADDITIONAL SUCTION FOR A BRIEF INTERVAL UNTIL SAID COLORING COMPOSITION HAS BEEN DRAWN THROUGH THE PERVIOUS PORTION OF SAID SCREEN AND PRINTED ON THE SURFACE OF SAID SHEET MATERIAL, DISCONTINUING THE APPLICATION OF SAID ADDITIONAL SUCTION, REMOVING SAID STENCIL SCREEN FROM SAID SHEET MATERIAL, AND THEREAFTER DISCONTINUING SAID FIRST SUCTION.