Thermoplastic container end for inertial spinwelding of thermoplastic container ends
US4762249A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 5, 1982 |
| Grant date | Aug 9, 1988 |
| Priority date | — |
| Expiry date | Aug 5, 2002 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29K2711/126
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A thermoplastic end (110), particularly a bottom, for a container which has upstanding paperboard sidewalls (112) and which is inertially spinwelded onto the paperboard sidewall for bonding. The end portion (110) has an annular groove (148) for snugly receiving the sidewall (112) and a wall configuration (136, 138, 140, 142 and 144) which minimizes the forces exerted on the bond which would tend to dislodge the end portion. The wall configuration is generally in the form of an inverted U-shape with a portion of an upstanding wall of the U forming a side of the annular groove. The end portion has strengthening ribs (122) positioned generally within the region of U-shape and additional radial ribs imparting strength and rigidity to the container end. The paperboard sidewall may be internally lined with a layer of thermoplastic material or may be unlined. During spinwelding, a sidewall supporting mandrel having an expansible engaging portion is inserted into the sidewall and subsequently expanded to define a cylindrical surface of a diameter equal to that of the specified internal diameter of the sidewall. A Teflon seating member at the end of the sidewall supporting mandrel establish…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.