Content-activation system for an automated mail extraction appar

Details Content-activation system for an automated mail extraction appar Content-activation system for an automated mail extraction appar

1991-04-19

1992-08-04

Coan, James F.

Package making

Methods

Opening only

53 75, 533816, B65B 5700, B65B 4330

Patent

active

051348349

ABSTRACT:
Envelopes in a bulk-mail processing system are inspected for emptiness, which indicates that all of the contents have been removed. The envelopes are spread apart at an extraction station, for manual or automatic removal of contents. The light transmissivity of the envelope and contents is measured when the envelope is unspread, and then when the envelope is spread. Based on at least the measured transmissivities of the envelope when spread and unspread, a threshold value of transmissivity consistent with the envelope being empty is calculated.

REFERENCES:
patent: 4353197 (1982-10-01), Stevens et al.
patent: 4376363 (1983-03-01), Russell
patent: 4649694 (1987-03-01), Haley
patent: 4863037 (1989-09-01), Stevens et al.
patent: 4934892 (1990-06-01), Smith et al.

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