a system for attaching a thin film sleeve to a drum using a flange made of thermoplastic material . the inner surface of the flange having an integrally molded portion , where the integrally molded portion is used to create a seal with a different thermoplastic material . the second thermoplastic material can be attached to the drum , thereby forming a seal between the drum , the second thermoplastic material , and the flange . the outer surface of the flange being integrally sealed with the thin film sleeve , thereby creating a barrier between any product being transported through the sleeve to the drum .