Patent ID: 7578906
Filing Date: 2009-08-25
Classification: D21F

Abstract:
1. A headbox and stock delivery system for a papermaking machine, comprising: (a) a radial stock distributor including a radial manifold having connector hoses extending therefrom; (b) a plurality of connector pipes to which the connector hoses from the radial manifold are connected, each of the connector pipes having a step expansion followed by a circular cross-section which tapers to a generally rectangular cross-sectional shape and which are located at regular intervals in a cross-machine direction (CD) across an inlet duct; (c) a stock dilution assembly which is connected to and receives the stock from the inlet duct, the stock dilution assembly including a plurality of stock feed pipes that extend from the inlet duct, and a respective dilution feed pipe in communication with and adapted to convey fluid from a source of lower consistency fluid to each of the individual stock feed pipes, a flow of fluid from each of the dilution feed pipes being controlled by a respective valve associated with each of the feed pipes, the plurality of stock feed pipes being adapted to receive the stock from the inlet duct and the fluid from the respective ones of the dilution feed pipes to adjust a basis weight consistency of the stock; (d) a headbox, including a stilling chamber, a tube bank, a nozzle with turbulence vanes to control stock turbulence and minimize streaks, and slice adjustment systems for allowing movement of a headbox slice in both horizontal and vertical directions: