Process and apparatus for the production of tighthead drums and widemouth drums
OwnerUdo Schutzinventor
Life of this patent
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Abstract
A process for the production of tighthead drums having dimensional stability of the injection molded lids and blow molded drum bodies, comprises blow molding double drum bodies from plastic and centrally separating them into two drum bodies. Tighthead lids are produced by injection molding from plastic. The tighthead lids are then welded to the drum bodies. Widemouth drums are also produced by blow molding double drum bodies from plastic and centrally separating them into two drum bodies, but with a molded-on edge at a distance under the drum opening. Drum lids are injected molded from plastic with an outside flange molded-on the lower lid edge. A sealant of plastic is injected into the lids and the lids are positioned on the drum bodies sealed with a clamping ring.
Claims15
In a process for the production of barrels from thermoplastic synthetic resin wherein a closed cylindrical twin body of an extruded tubular preform is blow-molded in a blowing mold, removed from the mold, and divided into two barrel bodies by cutting out a central ring which latter contains the blow opening of a shot-in blow mandrel;
- the improvement comprising manufacturing bunghole lids from plastic by injection molding in an injection mold, cooling the barrel bodies and the bunghole lids to a mutually fitting shape while moving the bodies and lids along cooling and calibrating paths arranged downstream of the blowing mold and the injection mold, and welding the bunghole lids to the barrel bodies to obtain bunghole barrels.
In a process for the production of barrels from thermoplastic synthetic resin wherein a closed cylindrical twin body of an extruded tubular preform is blow-molded in a blowing mold, removed from the mold, and divided into two barrel bodies by cutting out a central ring which latter contains the blow opening of a shot-in blow mandrel;
- the improvement comprising producing by injection molding in an injection mold barrel lids of a synthetic resin with an outer flange molded to a lower lid rim, cooling the barrel bodies and the barrel lids to a mutually fitting shape while moving the bodies and lids along cooling and calibrating paths arranged downstream of the blowing mold and the injection mold, injecting a sealing compound of a synthetic resin into the lids, and placing the lids onto the barrel bodies, in contact with a border molded at a spacing below the barrel opening, and closing the lids with a clamping ring.
Apparatus for the production of tighthead drums, comprising a machine (1) for blow molding double drum bodies (2) from plastic, a cutting device (3) for centrally separating said each of said double drum bodies (2) into two drum bodies (4), an injection molding machine (5) for the production of tighthead lids (6) from plastic, a processing machine (9) for cutting accurately to size a lower lid edge and cutting off of the flash from the injection molded lids, a welding machine (10) for welding the tighthead lids (6) to the drum bodies (4), and means (12) for heating the welding seam area of tighthead drums (13).
Apparatus for the production of widemouth drums, comprising a machine (47) for blow molding double drum bodies (48) from plastics, a cutting device (49) for centrally separating each of said double drum bodies (48) into two drum bodies (50) each with one molded-on edge at a distance below a drum opening, an injection molding machine (51) for the production of drum lids (52) from plastic, cooling and calibrating sections (53, 54) for drum bodies (50) and drum lids (52), a machine (56) for injecting a plastic sealant into said lids (52) and a drying device (57) as well as an assembly stand (58) for setting lids (52) on drum bodies (50) and sealing the lids with a clamping ring.
Dependencies are inferred from the claim text.