Method of forming a wraparound closure article
US4409177A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 1, 1981 |
| Grant date | Oct 11, 1983 |
| Priority date | — |
| Expiry date | Oct 1, 2001 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29C61/08
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A wraparound closure article comprising a slit tubular body having upstanding rails extending along the slit is formed by a combination of blow-and compression-moulding. The rails are formed by compressing a longitudinal edge portion of a parison between two parts of a closed split-mould to form a flange, and the tubular body is formed integrally with the rails by blowing the remainder of the parison into contact with the closed mould. The flange is then cut to provide the slit of the wraparound closure article and to divide the flange into two discrete rails. The slit extends along the pinch-line that forms as a result of compressing the edge portion of the parison in the closed mould.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.