Process and sealing material for producing the lid gasket of synthetic resin lids for blow-molded synthetic resin barrels

• US 5,225,125 A
• Filed: 03/16/1992
• Issued: 07/06/1993
• Est. Priority Date: 03/16/1991
• Status: Expired due to Term

• Current Assignee: Schmitz-Werke GmbH & Co. KG
• Original Assignee: Schmitz-Werke GmbH & Co. KG
• Inventors: Erll, Thomas, Wildfeuer, Eberhard
• Primary Examiner(s): Kuhns, Allan R.
• Application Number:
  US07/851,898
• Time in Patent Office: 477 Days
• Field of Search: 264/80, 264/46.4, 264/46.6, 264/69, 264/102, 264/268, 264/300, 264/71, 427/223, 156/82
• US Class Current: 264/46.6
• CPC Class Codes: B65D 2543/00092 circular
• CPC Class Codes: B65D 2543/00296 Plastic
• CPC Class Codes: B65D 2543/005 both cup and skirt
• CPC Class Codes: B65D 2543/00537 on the outside, or a part turned to the outside of the mouth of the container
• CPC Class Codes: B65D 2543/00555 on both the inside and the outside
• CPC Class Codes: B65D 2543/00564 indirect by means of a gasket or similar intermediate ring
• CPC Class Codes: B65D 2543/00972 Collars or rings
• CPC Class Codes: B65D 2543/0099 Integral supplemental sealing lips
• CPC Class Codes: B65D 43/0218 on both the inside and the outside of the mouth of the container B65D43/0216 takes precedence
• CPC Class Codes: B65D 45/32 for applying radial or radial and axial pressure, e.g. contractible bands encircling closure member

Abstract

A lid (1) is injection-molded of polyethylene, for a widemouthed barrel of a synthetic resin, and includes an outer rim (4) encompassing the barrel neck (3) and an inner rim (5) dipping into the barrel neck. The outer lid rim (4) and inner lid rim (5) form an annular space (7), an annular web (8) projecting axially from the base of this space. For producing the lid gasket (13), the annular space (7) is exposed to an open flame for activating the annular space surface. Subsequently the sealing material, preferably polyurethane, is injected from a foaming machine into the base of the annular space (7), and thereafter the lid (1) is vibrated in order to degasify the gasket (13). The sealing material, preferably consisting of foamed polyurethane, contains a parting compound having a long-term effect.

Claims

1. In a process for producing a lid gasket of synthetic resin lids for blow-molded synthetic resin barrels, with an outer lid rim encompassing a barrel neck and with an inner lid rim dipping into the barrel neck and projecting beyond a barrel opening, as well as with an annular web molded to the base of an annular space between the outer lid rim and the inner lid rim, said web being surrounded by a molded-on sealing material comprised of foamed synthetic resin;

the improvement comprising exposing the annular space (7) receiving the gasket (13) to an open flame on the inside of the lid (1), which is injection-molded from a synthetic resin, in order to activate a surface (15) of the annular space and enhance bonding between the gasket and the surface, subsequently injecting the synthetic resin sealing material (9) from a foaming machine into the annular space (7) to form the gasket, and thereafter vibrating the lid (1) in order to degasify the gasket (13).