Expansible drum liner

Claim 1

A RADIALLY EXPANSIBLE CYLINDRICAL DRUM LINER FORMED OF FLEXIBLE INERT STRONG THERMOPLASTIC SELECTED FROM THE GROUP CONSISTING OF POLYETHYLENE, POLYPROPYLENE, IRRADIATED POLYPROPYLENE, POLYVINYLCHLORIDE, RUBBER HYDROCHLORIDE, POLYETHYLENE TEREPHTHALATE, POLYMERIC HEXAMETHYLENE ADIPAMIDE AND POLYVINYLFLUORIDE COMPRISING A GENERALLY CYLINDRICAL SIDE WALL HAVING A FIRST END AND A SECOND END; A DISK LIKE TOP INTEGRALLY SECURED BY MOLDING AT THE PERIPHERY THEREOF OF SAID SIDE WALL FIRST END; A DISK LIKE BOTTOM INTEGRALLY SECURED BY MOLDING AT THE PERIPHERY THEREOF TO SAID SIDE WALL SECOND END SO AS TO INCLUDE A GENERALLY CYLINDRICAL CLOSED VOLUME WITHIN SAID LINER BETWEEN SAID TOP AND SAID BOTTOM; MEANS DEFINING A PLURALITY OF GENERALLY RADIALLY EXTENDING CONVOLUTIONS IN THE DISK-LIKE TOP OF SAID LINER; AND FLUTING MEANS IN SAID SIDE WALL DEFINING A PLURALITY OF GENERALLY PARALLEL, LONGITUDINALLY EXTENDING CONVOLUTIONS LOCATED AROUND A MAJOR PART OF THE PERIPHERY IN SAID SIDE WALL, SAID FLUTING MEANS MERGING INTO THE INTEGRALLY MOLDED TOP AND BOTTOM, MEANS DEFINING AN OPENING THROUGH THE LINER TOP, A TUBULAR NECK SECURED BY MOLDING AS AN INTEGRAL EXTENSION OF SAID TOP TO FORM A SEAMLESS ENTITY OF SAID LINER, SAID TUBULAR NECK EXTENDING OUTWARDLY OF SAID TOP SURROUNDING SAID OPENING, SAID LINER BEING ADAPTED TO BE INSERTED INTO A DRUM OF SLIGHTLY SMALLER DIAMETER WHEN THE LINER IS UNCONFINED SO THAT THE LONGITUDINALLY DIRECTED FLUTES ARE RESILIENTLY URGED INTO INTIMATE CONTACT WITH THE DRUM SIDE WALL INTERIOR THEREBY ELIMINATING ABRASION DAMAGE WHEN THE LOADED DRUM AND LINER ARE SHIFTED, AND RADIALLY EXTENDING FLUTES AT ONE END OF SAID LINER LOCATED CENTRALLY AND ALONGSIDE OF THE NONFLUTED AREAS OF THE SIDE WALL.