Watertight and air pervious flocked sheet material and method of making same

Claim 1

A PROCESS OF MAKING A FLOCKED FABRIC WHICH COMPRISES, APPLYING A FLEXIBLE ADHESIVE VULCANIZABLE MATERIAL AS A LAYER OVER ONE FACE OF A FABRIC WEB, SAID MATERIAL HAVING A MULTITUDE OF CRATERS THEREIN WITH TINY APERTURES PROVIDING COMMUNICATING PASSAGES FOR AIR THROUGH SAID LAYER, ALLOWING SAID LAYER TO DRY, APPLYING A CONTINUOUS FLEXIBLE LAYER OF VULCANIZABLE MATERIAL OVER AN OUTER FACE OF THE FIRST LAYER, SUBJECTING THE FABRIC WITH THE LAYERS CARRIED THEREON AND A MULTITUDE OF FIBERS TO AN ELECTROSTATIC FIELD AT A VOLTAGE OF ABOUT 150,000 VOLTS TO MOVE THE FIBERS WITH THEIR LENGTHWISE DIMENSIONS SUBSTANTIALLY PERPENDICULAR TO THE FABRIC WHEREBY THE INNER END PORTIONS OF THE FIBERS MOVE TRANSVERSELY THROUGH THE SECOND LAYER WITH THE INNER ENDS INTO THE PRESENCE OF THE FIRST LAYER, AND VULCANIZING THE LAYERS BEFORE THE MATERIALS THEREOF HAVE AN OPPORTUNITY TO IMPREGNATE THE FIBERS TO ANY SUBSTANTIAL EXTENT.