Evacuation ring for laminating process

Claim 1

AN EVACULATION RING ADAPTED TO BE MOUNTED AROUND THE PERIPHERY OF A LAMINATE STRUCTURE COMPRISING AN IMPERVIOUS ELASTIC RING OF SUBSTANTIALLY U-SHAPED CROSS SECTION SHAPED TO BE STRETCH MOUNTED ON AND TO ENCLOSE THE END EDGE PORTIONS OF SAID LAMINATE, SAID RING HAVING A GROOVE PORTION THEREIN SEALINGLY RECEIVING THE LAMINATE PERIPHERY WITH THE GROOVE BOTTOM IN OPEN COMMUNICATION WITH THE END EDGE PORTIONS OF SAID LAMINATE, AND INTEGRAL RIGIDIFYING MEANS CARRIED BY AND POSITIONED INTERIORLY OF THE RING GROOVE TO SUBSTANTIALLY SPACE THE GROOVE BOTTOM FROM THE END EDGES OF THE LAMINATE AND RESISTING RADIAL COLLAPSE OF THE RING AGAINST THE LAMINATE END EDGE PORTIONS WHILE PERMITTING LONGITUDINAL EXTENSION OF THE RING, SAID RIGIDIFYING MEANS EXTENDING LONGITUDINALLY OF THE RING AND ARRANGED TO ABUT THE END EDGES OF THE LAMINATE ON WHICH THE RING IS MOUNTED AND COMPRISING A COIL SPRING MEMBER THAT PROVIDES A SUCTION CONDUIT INTERIORLY OF AND ADJACENT SAID RING GROOVE PORTION.