Screen apparatus

Details Screen apparatus Screen apparatus

1998-10-20

2001-03-27

Reifsnyder, David A. (Department: 1723)

Liquid purification or separation

Filter

With residue removing means or agitation of liquid

C210S413000, C210S485000, C210S497010, C210S499000, C162S055000, C209S273000, C209S305000, C209S306000

Reexamination Certificate

active

06206204

ABSTRACT:

BACKGROUND OF THE INVENTION AND RELATED ART STATEMENT
The present invention relates to a screen apparatus, and more particularly, to a screen apparatus which can improve a processing amount and an effect of separating good fibers and foreign substances.
Conventionally, in the screen apparatus, a papermaking material received in a tank is stirred by a stirring member, and foreign substances in the papermaking material is removed through a screen to thereby screen or select the papermaking material.
However, as it approaches a lower part of the tank, that is, in a downstream side in the flow of the papermaking material, the papermaking material is condensed.
As a result, there have been problems. Namely, as a flow distance of the papermaking material in the tank from a supply inlet for the papermaking material to the screen becomes longer, a material passing resistance through the screen due to concentration or condensation of the papermaking material is increased, so that the processing amount is lowered. Also, since clogging of the screen is liable to occur, an effect of separating foreign substances and good fibers is lowered.
An object of the invention is to provide a screen apparatus which can obviate the aforementioned problems.
Further objects and advantages of the invention will be apparent from the following description of the invention.
SUMMARY OF THE INVENTION
To achieve the above object, the present invention provides a screen apparatus including a tank for receiving a papermaking material; a screen for dividing the tank into a first chamber and a second chamber and separating a foreign substance from the papermaking material; a first supply passage for supplying the papermaking material into the tank and including a first supply inlet located at an upper side of the tank; a second supply passage for supplying the papermaking material into the tank and including a second supply inlet located lower than the first supply inlet; a stirring member disposed between an inner wall of the tank and the screen and stirring the papermaking material in the first chamber; a screened papermaking material discharge passage communicating with the second chamber and leading the papermaking material screened by the screen to an outside of the tank; and a foreign substance discharge passage communicating with the first chamber and leading the foreign substance, which does not pass through the screen, to the outside of the tank.
Since the papermaking material is supplied to the lower part of the screen as well as the upper part of the screen, the condensation or thickening of the papermaking material at the lower part is avoided.
In the screen apparatus of the invention, the first supply inlet may be located higher than the openings provided at an uppermost part of the screen. Also, the second supply inlet may be located lower than the openings provided at a lowermost part of the screen. Since the first and second supply inlets are not opposed to the openings of the screen, the screen is not damaged by the papermaking material with the foreign substance ejecting thereto.
Further, preferably, a foreign substance discharge outlet of the foreign substance discharge passage may be located between the first supply inlet and the second supply inlet. Also, an upper projecting member may be disposed circularly above the foreign substance discharge outlet to project from an inner wall of the tank, and a lower projecting member may be disposed circularly below the foreign substance discharge outlet to project from the inner wall of the tank. As a result, the foreign substance can be discharged easily and smoothly.


REFERENCES:
patent: 4067800 (1978-01-01), Young
patent: 5096127 (1992-03-01), Young
patent: 5318186 (1994-06-01), Reienecker
patent: 5605234 (1997-02-01), Aikawa

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