Drainage of Forming Part

V. I. D. Formation System

Abstract

Various types of gravity and vacuum augmented foils have been used as typical drainage equipment for conventional Fourdrinier machines.
In any type of drainage equipment, filtration mat formed in the early stage of drainage is a limiting factor for the drainage efficiency in the later stage. When we call this dewatering process as “filtration drainage”, paper makers already have made the possible efforts to overcome the negative effects of “filtration drainage”. It seems that the efficiency of conventional drainage equipment has reached its limit.
This paper deal with a device, V. I. D. technology with its thickening drainage process, which has been developed to provide the solutions for various issues of conventional forming technology. Examples of its field applications are also given.