Liquid purification or separation – Processes – Including controlling process in response to a sensed condition
Patent
1988-05-23
1989-07-18
Jones, W. Gary
Liquid purification or separation
Processes
Including controlling process in response to a sensed condition
210780, 210790, 210791, 210106, 210137, 210138, 210329, 210340, 425199, B01D 3300, B01D 3340, B01D 3512, B01D 3704
Patent
active
048491136
ABSTRACT:
An improved continuous polymer filter of the screen belt type employs a valve arrangement to selectively apportion the extruder output flow through at least two filter paths. In the neutral valve position both filter paths receive polymer at equal flow rates creating a pressure across the screen belts that is too high to permit the screen belts to be advanced when a clogged belt section requires replacement with a clean section. To effect screen belt advancement, the valve is actuated to reduce the flow rate in the filter path requiring the replacement while increasing the flow rate to the same degree in the other filter path so that the net flow rate remains substantially constant. The screen belt receiving the reduced flow experiences a sufficiently reduced pressure drop thereacross to permit it to be advanced in a conventional manner, after which the valve is returned to its neutral state. The screen belts in both paths are advanced alternately while maintaining a constant net flow and assuring sufficient flow through the reduced flow path to avoid entry of air into the filter path. Valve actuation and screen belt advancement may be effected automatically and in synchronization in response to a pre-set timer, to detected pressure conditions in the flowing polymer, or other parameters.
REFERENCES:
patent: 3007199 (1961-11-01), Curtis
patent: 3059276 (1962-10-01), Yokana
patent: 3146494 (1964-09-01), Sponaugle
patent: 3243849 (1966-04-01), Joukaihen
patent: 3471017 (1969-10-01), Kalman
patent: 3503096 (1970-03-01), Marianelli
patent: 3645399 (1972-02-01), Kalman
patent: 3669166 (1972-06-01), Colin
patent: 3856674 (1974-12-01), Kalman
patent: 3940222 (1976-02-01), Zink
patent: 3940335 (1976-02-01), Kalman
patent: 4167384 (1979-09-01), Shirato et al.
patent: 4202659 (1980-05-01), Kinoshita
patent: 4238877 (1980-12-01), Rapp
patent: 4511472 (1985-04-01), Trott
Evans Linda S.
Jones W. Gary
LandOfFree
Continuous polymer filter does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Continuous polymer filter, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Continuous polymer filter will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-169833