Process and apparatus for marking articles of foam material when produced irregularly
US4919862A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jan 31, 1989 |
| Grant date | Apr 24, 1990 |
| Priority date | — |
| Expiry date | Jan 31, 2009 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29C37/00
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A process and apparatus for marking an article made of foam material whenever during its manufacturing process some irregularity has occurred. As a consequence of having ascertained an irregularity in some operational parameter, after the introduction of the reactive mixture in the inner cavity of the lower shell of the mould and as long as the mould is still open, to a part of the inner cavity of the upper shell of the mould is applied a mark formed by a dyestuff resistant to the processing conditions, physically and chemically compatible with the formed article and capable of adhering thereto when, during its expansion, the article reaches to contact the marked part of the inner cavity of the upper shell of the mould. The marking operation can take place automatically by action of an equipment comprising an ejector arranged for spraying towards the internal cavity of the upper shell of the open mould the dyestuff intended to form the mark.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.