Abstract: Disclosed are methods and apparatus for rinsing soluble materials from the filter cake formed in a double belt press. The belts with the filter cake therebetween are suspended between two spaced apart rollers to relieve pressure on the filter cake and the filter cake is simultaneously exposed to a rinse medium. Pressure is thereafter re-applied to the filter cake to extract the rinse medium therefrom.

Abstract: This invention relates to a method for manufacturing a grooved roller where the grooving is continuous and extends from one rim of the roller to the other, which comprises cutting a groove of slight side angle and in the form of a thread on the periphery of the roller, and then pressing a contoured wire with prestressing into the groove.

Abstract: This invention relates to an improvement in a press for dehydrating material in which the material is passed between two endless sieve belts adapted to move in the same direction and to pass over and around pairs of rollers and/or offset upper and lower rollers, the rollers in various sets forming a pre-dehydration zone and a wedging or compression zone,The improvement comprising a compression zone in the form of a frame-like structure, said structure containing individual compression roller means mounted on bearing blocks of varying heights,And means for displacing and/or exchanging said bearing blocks, whereby a path for said material has an ascending slope with line compression, or is wavelike or S-shaped with surface compression.