Common wire path of a wet end section of a twin wire paper making machine

Claim 1

A wet end section of a paper making machine, comprising: a pair of paper machine wet end section wires including an inner wire forming a first wire loop and an outer wire cooperating with the inner wire and forming a second wire loop; means for supplying stock for dewatering and including a stock outlet; a forming cylinder arranged inside the first loop of the inner wire so that the inner wire wraps partially around the forming cylinder; means for directing the outer wire to meet the inner wire at the forming cylinder for defining a feed nip at the forming cylinder, and the stock outlet being directed to dispense stock into the feed nip; the wires having a common path of movement from the feed nip and along the outer surface of the forming cylinder which deflects the wires in a first direction; a first curved surface following the forming cylinder, the common path of the wires extending over the first curved surface, the first curved surface being inside the loop of the outer wire, the first curved surface being shaped and oriented such that the wire path is curved in a second direction opposite the first direction of curvature of the wire path around the forming cylinder; a second curved surface further along the common path of the wires past the first curved surface, said second curved surface being disposed inside the loop of the inner wire, the common path of the wires extending over the second curved surface, the second curved surface being so curved and positioned that the wires moving along the common path past the second curved surface are deflected in the first direction opposite to the second direction of curvature of the wires passing over the first curved surface; the length of the second curved surface along the common path of the wires being substantially 1/10 or less of the length of the first curved surface along the common path of the wires; a doctor blade carrier supported in the wet end section and inside the first loop of the inner wire and extending across the common path of the wires, the second curved surface being defined on the doctor blade carrier; the doctor blade carrier being tiltable with respect to the wires for moving the second surface selectively further into and out of the common path of the wires, such that the second surface is movable to deflect the wires selectively more or less in said first direction; a suction roll located inside the second loop of the outer wire, the suction roll being disposed along the common path of the wires past the second curved surface, the common path of the wires extending over the outer surface of the suction roll; and means supporting the wires for separating into the respective first and second loops following the second curve surface.