Patent ID: RE43679

Claim:
An apparatus for improving sheet properties in a paper making machine including a an open surface forming section, at least one having a single forming fabric, the fabric having a machine side and a paper side , and moving in the machine direction , and a head box having a head box slice which delivers a stock jet onto the paper side of the at least one moving forming fabric, comprising in sequence in the machine direction: a) a first fixed support element and in contact with the machine side of the at least one forming fabric; b) at least one drainage box provided with a foraminous support surface surfaces , said foraminous support surface includes at least one vertically adjustable support element and which is provided with support means for the first fixed element; c) a last fixed support element, supported by a drainage box, in contact with the machine side of the at least one forming fabric, which together with the first fixed support element and the machine side of the at least one forming fabric defines a reference surface; and d) the at least one drainage box having an independently controlled vertical adjustment means for the at least one vertically adjustable support element , which permits adjustment of the or each vertically adjustable element while the paper making machine is operating so as to move said at least one vertically adjustable support element into and out off of contact with the machine side of the forming fabric.