Device for detecting pin-holes or tears in a foil
US6380549B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 22, 1999 |
| Grant date | Apr 30, 2002 |
| Priority date | — |
| Expiry date | Apr 22, 2019 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29K2705/02
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
In order to detect pin-holes or tears in a foil (16), during deformation of the foil (16), the transmission of light through the foil is measured continuously by means of at least one light source (22) situated on one side of the foil (16) and at least one of the light sensors (24) on the other side of the foil (16). The light source (22) is integrated in a shaping-punch (14) and the light sensors (24) are situated in a die (12) which is employed along with the punch (14). The pin-hole detector (10) enables pin-holes or tears formed during the deformation of the foil to be detected on-line in a single shaping step closely resembling actual working practice.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.