Process of forming adherent polyethylene coating on metal surfaces

Claim 1

THE PROCESS OF FORMING AN ADHERENT POLYETHYLENE COATING ON THE INNER SURFACES OF STEEL DRUMS, PAILS AND SIMILAR OPEN-ENDED METAL CONTAINERS WHICH COMPRISES PREHEATING THE CONTAINER TO A TEMPERATURE OF FROM 350 TO 475* F., THEN WHILE THE CONTAINER REMAINS HEATED WITHIN SAID TEMPERATURE RANGE FILLING IT ABOUT HALFWAY FULL WITH A QUANTITY OF INDIVIDUALLY DISCRETE SOLID PARTICLES OF POLYETHYLENE, SAID QUANTITY BEING IN SUBSTANTIAL EXCESS OF THE AMOUNT REQUIRED TO PRODUCE THE PREDETERMINED THICKNESS OF COATING, AND THEREUPON ROTATING SAID CONTAINER IN AN INCLINED POSITION SO AS TO BRING PORTIONS OF SAID POLYETHYLENE PARTICLES INTO CONTACT WITH ALL OF THE INTERIOR SURFACES OF SAID CONTAINER, THEREBY INDUCING FUSION OF SAID PARTICLES AND ADHERENCE THEREOF TO SAID SURFACES, CONTINUING SAID ROTATING ACTION TO BUILD UP THE THICKNESS OF THE COATING OF FUSED PARTICLES ON SAID CONTAINER SURFACES, THEREAFTER REMOVING THE EXCESS OF COMMINUTED POLYETHYLENE THAT HAS NOT BECOME ADHERED TO THE CONTAINER SURFACES, AND THEN SUBJECTING SAID CONTAINER TO A BAKING HEAT TREATMENT TO COMPLETE THE ADHESION AND CONVERSION OF SAID COATING TO A FIRMLY ADHERENT IMPERMEABLE AND INSOLUBLE FORM.