Method for producing a wide-mouthed barrel made of thermoplastic synthetic material

摘要

The mold produces a tub (2) with body (3), base (4), base ring (5) (optional), bead (6, 7) and cover (9). The bead is below the opening edge. A blowing mandrel is slid in during blowing of a preform, which is prepared from a tube extruded into a mold. An electrically-conducting contact strip (11) is integrated into the molding, to form an electrical connection between the inner surface (12) and the conductive- or permanently-antistatic outer surface (13) of the body. Following cooling of the tub in the mold and its removal, the intermediate ring (10) is cut out from it. After the sealing ring is laid into the sealing bed of the cover, the latter is fastened to the body using a clamping ring. A multilayer tube is formed from a non-conductive base material, by coextrusion. It has one or more contact strips on the circumference. These comprise an electrically-conductive plastic material. The tube is blow to a preform before finishing as an electrically-earthed tub body with an electrically-conducting strip integrated in: the cover, the intermediate ring, the body and the base. This forms an electrically-conducting bond between the inner surface (12) and the outer surface (13) of the tub. It has the same wall thickness as that of the tub. Further details and variants of the structure and method are provided in accordance with the foregoing principles.