Apparatus for making a non-woven sheet

Details Apparatus for making a non-woven sheet Apparatus for making a non-woven sheet

1989-09-22

1990-11-06

Woo, Jay H.

Plastic article or earthenware shaping or treating: apparatus

Control means responsive to or actuated by means sensing or...

4251748E, 425224, 264 22, 264 401, 264205, B29C 4792, B29C 7104

Patent

active

049682385

ABSTRACT:
A device to detect the loss of a continuous spun web of plexifilament fibers exiting a forwarding apparatus depends on the manner in which the filaments oscillate in a cross machine direction prior to depositing onto a collecting surface. The loss of these fibers, due to hang up in the filament forwarding device, can cause multiple position spinning machine loss due to the knock down of nearby spinning positions or wrap the sheet on forwarding rolls. The hang up in the forwarding device is referred to as a blow-up. This invention detects the instant a blow-up occurs through the loss of electrostatic charge due to the absence of the oscillating swath at the sensor. When the instant charge is lost at the sensor, a signal indicates a blow-up has occurred.

REFERENCES:
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patent: 4537733 (1985-08-01), Farago
patent: 4666395 (1987-05-01), Shah
Davies, J. Scientific Instruments, 1967, vol. 44, pp. 521-524, "The Examination of the Electrical Properties of Insulators by Surface Charge Measurement".

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