Method and apparatus for ply discontinuity detection

Details Method and apparatus for ply discontinuity detection Method and apparatus for ply discontinuity detection

1996-08-28

1998-04-07

Cosimano, Edward R.

Boots, shoes, and leggings

364550, G06F 1900

Patent

active

057372381

ABSTRACT:
A ply break detector for a laminate web uses a short time constant low pass filter and a long time constant low pass filter for filtering output signals from a sonic web scanner. A difference circuit compares output signals from the two filters to create a difference signal. A ply discontinuity indication is generated when the difference signal exceeds a predetermined threshhold with a predetermined persistence. Analog and digital versions are disclosed.

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