Method for manufacturing wide mouth barrels of thermoplastic materials

A method for manufacturing wide mouth barrels from thermoplastic material, wherein the wide mouth barrels have a removable lid and a clamping ring closure, the method comprising the steps of:

• extruding a multi-layer plastic tube into a blow mold and producing a closed preform;
• finish-blowing the closed preform to a barrel body having a basic barrel member, a bottom with or without support ring, a barrel lid selected from the group consisting of a closed lid or a bung lid, a projection on the basic barrel member for attaching the barrel lid by means of a clamping ring closure, wherein the projection is formed on the basic barrel member at a level of a barrel opening rim or at a spacing below the barrel opening rim of the wide mouth barrel, and an intermediate ring between the projection and the barrel lid or the barrel opening rim and the barrel lid;
• introducing blowing air for finish-blowing the closed preform to a barrel body having a closed lid through at least one injection blow nozzle inserted into the intermediate ring and introducing the blowing air for finish-blowing the closed preform to a barrel body with a bung lid through at least one of a bung hole of at least one bung of the bung lid by a blow nozzle and/or through at least one blow nozzle introduced into the intermediate ring;
• after cooling of the barrel body in the blow mold and removal of the barrel body from the blow mold, separating the basic barrel member and the barrel lid from one another by cutting out the intermediate ring from the barrel body;
• inserting a seal into a sealing seat of the lid;
• and
• fastening the lid by the clamping ring on the projection of the basic barrel member, wherein, in the step of extruding, a multi-layer tube of a non-conducting basic material is co extruded together with at least one section arranged on the circumference of the tube, wherein the section is a contact strip of an electrically conducting plastic material, wherein the preform is finish-blown to an electrically grounded barrel body with at least one electrically conducting contact strip integrated into the barrel lid, the intermediate ring, the basic barrel member, and the barrel bottom, wherein the contact strip provides an electrical connection between the inner surface and the outer surface of the barrel body and has a thickness that matches a wall thickness of the barrel body.