The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 03, 1991
Filed:
Sep. 20, 1989
Atsushi Takashima, Kobe, JP;
Kurita Machinery Manufacturing Company Limited, Osaka, JP;
Abstract
A filtration method includes steps of feeding liquid to be filtered into a filter medium between a fixed plate and a movable plate; and reducing capacity of a filter chamber formed by the medium by moving the movable plate in a direction in which the movable plate presses the fixed plate through the medium so as to perform expressing filtration of the liquid and to produce cake. The reducing step comprises alternately repeating at least one time an expressing pressure-increasing process for increasing pressure in the liquid in the medium by a specified increment in the filtration of the liquid, and an expressing pressure-maintaining process for maintaining the pressure constant during a specified period, so that the filtration is performed under a specified pressure corresponding to a desired water content of the cake to produce the cake. A filter press for employing the method has the filter medium arranged between the fixed plate and the movable plate capable of moving toward and away from the fixed plate. The press comprises a driving device for driving the movable plate to move toward and away from the fixed plate; a pressure sensor arranged at one of the movable plate and the fixed plate and measuring pressure in the chamber; and a control unit for controlling the expressing filtration of the liquid by control of drive of the driving device on the basis of a signal outputted from the sensor.