Patent ID: 7993492
Filing Date: 2011-08-09
Classification: D21F

Abstract:
1. A drainage device for maintaining a plurality of hydrodynamic processes for proper drainage of liquid or water from a paper stock or fiber slurry transported on a fabric which passes over the device, and for reducing cross machine direction variations in paper sheet or fiber mat quality, the device comprising: a primary blade having a leading edge support surface adjacent the fabric for support thereof and a trailing edge surface that diverges downwardly, away from the leading edge support surface; a support blade located between the fabric and the primary blade which separates the fabric from the primary blade and forms a channel; wherein the channel directs water drained from the paper stock into a controlled turbulence or a micro-activity zone formed between the primary blade and the fabric, wherein the drained water is reintroduced into the fiber slurry in part or completely.