Conduit system for conveying fibrous stock from deaerator chamber to headbox in papermaking machine

Abstract

Abstract Papermaking apparatus in which deaerated papermaking stock is gravity fed from the evacuated chamber of a stock receiver to paper web-forming means through dropleg supply conduit system interconnecting the bottom of this chamber and the exit slot or slice of paper web-forming headbox, the dropleg conduit system having entry communication with the receiver chamber along a substantial part of a major lateral expanse of the bottom portion of the deaerated stock collecting zone thereof, the droplet conduit system preferably having exit communication with the delivery passage of the paper web-forming headbox transversely in the direction of the transverse length of the exit slice. The conduit system is provided such that its flow course between the stock receiver and the web-forming headbox delivery passage has no course deviation laterally off the web-forming means axis. The dropleg conduit system may be provided in the form of a plurality of closely spaced parallel arranged pipes, the entry ends thereof being connected to the chamber collecting zone and the exit ends thereof being connected to the delivery passage. The dropleg conduit system also may be provided as a single, relatively wide chute having its passage connected by an elongated slot extending along a substantial portion of a major lateral expanse of the bottom of the chamber collecting zone. Various forms of flow control valves may be embodied in the dropleg supply conduit system to restrict selectively their effective size for correspondingly regulating the rate of flow of the deaerated stock to the paper web-forming headbox in accordance with the demand for the particular grade of paper being made.

Inventors

• 👤 R Kaiser

Bibliographic Details