Method and apparatus for fabricating hollow bodies and sheets of plastic material

Claim 1

IN AN APPARATUS OF THE CHARACTER DESCRIBED FOR FORMING HOLLOW BODIES OF A MATERIAL THAT IS AT LEAST PARTIALLY A PLASTIC, THE COMBINATION OF: CONVEYOR MEANS, A SERIES OF MOLDS ON SAID CONVEYOR MEANS TO BE CARRIED THEREBY TO A SERIES OF STATIONS IN SEQUENCE FOR A CYCLE OF OPERATION; MEANS TO ROTATE SAID MOLD AT SOME OF SAID STATIONS EARLY IN SAID SEQUENCE AT RATES TO CAUSE MATERIAL TO CLING TO THE INNER SURFACES ON THE MOLDS BY CENTRIFUGAL FORCE; MEANS AT ONE OF SAID EARLIER STATIONS TO DIRECT AT LEAST ONE STREAM OF PLASTIC MATERIAL INTO THE ROTATING MOLDS FOR DEPOSIT ON THE INNER SURFACES OF THE MOLDS THEREBY FORMING LAYERS OF THE CONFIGURATION OF THE DESIRED HOLLOW BODIES, MEANS TO POSITION BAGS IN THE MOLDS AT ONE STATION AND TO REMOVE THE BAGS AT A LATER STATION; MEANS FOR CONNECTING THE POSITIONED BAGS TO THE MOLDS IN A FLUID-TIGHT MANNER TO FORM SEALED SPACES AROUND THE BAGS ENCLOSING SAID LAYERS; MEANS TO EVACUATE SAID SPACES TO REMOVE GASEOUS FLUIDS FROM SAID LAYERS; AND MEANS TO EXPAND THE CONNECTED BAGS BY FLUID PRESSURE TO PLACE THE LAYERS UNDER PRESSURE FOR A CURING PERIOD.