Method and device for recognition of a tear-off strip on a material web

Device for detecting a tearing-off strip (11) within a material web (12), especially a plastic packing film. The device comprises ultrasonic transmitter (18) and receiver (19) on either side of the film web. The transmitted ultrasound beam is focussed on the area of the film containing the tearing-o...

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Bibliographic Details
Main Author FOCKE HEINZ,CZARNOTTA MICHAEL
Format Patent
LanguageEnglish
Published 30.11.2005
Edition7
Subjects
CONVEYING
HANDLING THIN OR FILAMENTARY MATERIAL
INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES
MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGINGARTICLES OR MATERIALS
MEASURING
PACKING
PERFORMING OPERATIONS
PHYSICS
STORING
TESTING
TRANSPORTING
UNPACKING
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Summary:Device for detecting a tearing-off strip (11) within a material web (12), especially a plastic packing film. The device comprises ultrasonic transmitter (18) and receiver (19) on either side of the film web. The transmitted ultrasound beam is focussed on the area of the film containing the tearing-off strip. If the strip is missing or in the wrong location, a corresponding warning signal is generated. An Independent claim is made for a method for detecting the tearing-off strip in packaging film in which an ultrasonic receiver detects a change in the intensity of detected ultrasound due to the absence of the strip.
Bibliography:Application Number: CN200380100911