01805493 is referenced by 1 patents.

The invention concerns a method for discriminating in a machine processing mail items, mail items (P1, P2, P3) contained in paper envelopes and mail items contained in plastic envelopes, which consists in moving each item in front of a suction pressure element (6) so as to produce an acoustic signal resulting from the suction effect of the suction pressure element on a surface of said item, and in comparing said acoustic signal with a reference signal to detect whether the envelope of said item is made of paper or of plastic material.

Title
Acoustic method for discriminating paper and plastic envelopes
Application Number
01805493
Publication Number
1404419
Application Date
April 2, 2001
Publication Date
March 19, 2003
Inventor
Jean Marc Teluob
Francovois Chaume
Agent
guo saiyu
Assignee
Solystic
IPC
B07C 05/34