Manufacture of pressure-sealing envelopes, bags, and the like

Claim 1

IN THE MANUFACTURING OF PRESSURE SEALING ENVELOPES, BAGS OR OTHER CONTAINERS, WHEREIN UNIFORM CONTINUOUS FILM-FORMING COATINGS OF RUBBER LATEX ARE PRODUCED ON SELECTED AREAS OF ADVANCING CONTAINER MATERIAL BY AIR PRESSURE SPRAYING OF A LIQUID LATEX-CONTAINING MIXTURE INCLUDING A VOLATILE ANTI-COAGULANT FOR THE LATEX THROUGH WIDE OPEN MASK APERTURES CORRESPONDING SUBSTANTIALLY IN SIZE AND SHAPE TO THE MATERIAL AREAS DESTINED TO BE LATEX COATED, THE IMPROVEMENT WHICH CONSISTS IN MOVING THE SOAPERTURED MASK, SYNCHRONOUSLY WITH THE MATERIAL''S ADVANCE, SUCH THAT IT INTERCEPTS ALL OF THE SO-SPRAYED LIQUID MIXTURE EXCEPT THE PORTIONS WHICH PASS THROUGH SAID APERTURES ONTO SAID SELECTED AREAS, AND USING SAID MASK''S MOVEMENT TO RECURRENTLY PASS SAID MASK AND ITS INTERCEPTED SPRAY THROUGH A BODY OF WETTING LIQUID WHICH IS MISCIBLE WITH SAID SPRAY AND DEVOID OF ANY COAGULATED EFFECT UPON LATEX, WHEREBY TO MAINTAIN SAID MASK AND THE SPRAY THERE-