Device for detecting defects of web
AssigneesNippon Petrochemicals Company, Limited, Polymer Processing Research Inst., Ltd.
InventorsKintaro Aihara, Shinji Yamazaki
Life of this patent
Estimating the term…
Abstract
A plurality of probes 3 or 10 are arranged in a conveying path of a web 1 or 9 comprising a slit sheet or a nonwoven fabric for contact with the web 1 or 9. The probes 3 or 10 are rotatably supported and arranged so that if a defect portion exists in the web 1 or 9, the probes 3 or 10 rotate to the defect portion of the web and protrude under the web, and when the probes 3 or 10 protrude under the web, a detecting means 6b outputs a defect detection signal.
Claims15
A device for detecting defects in a web comprising:
- conveying means for conveying a web in a predetermined direction,
- holding means arranged near said web,
- at least one probe rotatably pivotally attached to said holding means for making contact with the web, and
- detecting means generating an output signal in response to the rotational movement of said probe,
- wherein said web comprises a laminated nonwoven fabric comprising a first web having a network structure comprising longitudinal ribbons generally extending parallel to the conveying direction and oblique ribbons extending obliquely and connected to the longitudinal ribbons, and a second web having a network structure comprising lateral ribbons generally extending perpendicular to the conveying direction;
- said probe comprising at least one first probe arranged so that it detects defects of the oblique ribbons between the adjacent longitudinal ribbons in a manufacturing process of said first web prior to the lamination, and at least one second probe arranged so that it detects defects of said laminated nonwoven fabric;
- said first probe being made of a material lighter than a material of said second probe.
A device for detecting defects in a web having a plurality of ribbons extending in a longitudinal direction and a plurality of ribbons crossing said longitudinal ribbons in an oblique direction, said longitudinal ribbons being spaced from each other by a first distance and said oblique ribbons being spaced from each other by a second distance, comprising:
- conveying means for conveying the web in the longitudinal direction;
- a plurality of probes, each of said probes having a portion that has a width less than the first distance and a length greater than the second distance;
- means for holding said probes so that the probes portions extend in the longitudinal direction and so that the portion of each of said probes is brought into contact with a surface of the web so that if a defect portion exists in the web, the probe portion is displaced to an opposite side of the web, and
- detecting means for generating an output signal in response to the displacement of said probes.
Dependencies are inferred from the claim text.