Device for detecting pin-holes or tears in a foil

Details Device for detecting pin-holes or tears in a foil Device for detecting pin-holes or tears in a foil

G - Physics

01

N

G01N 21/88 (2006.01) B29C 51/46 (2006.01) B65D 75/36 (2006.01) B29C 51/08 (2006.01) B29C 51/14 (2006.01)

Patent

CA 2270499

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.

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