Claims
- 1. A continuous process of washing paper making pulp in combination with a driven foraminous wire having outer and inner surfaces and forming a loop enclosing and supported by horizontally spaced breast and couch rolls and including upper and lower wire runs traveling in opposite directions toward and away from said couch roll respectively, comprising the steps of:
- supplying a liquid suspension of pulp to be washed to said outer surface of said upper wire run adjacent said breast roll,
- causing liquid in said suspension to drain through said upper wire run and thereby forming a pulp mat thereon,
- applying washing liquid from above to said mat as said mat travels on said upper wire run toward said couch roll,
- draining said washing liquid through said upper wire run to form thereon a mat of washed pulp,
- repeating said liquid applying and draining steps at a plurality of stages located between said rolls,
- collecting said drained liquid within said loop at each of said stages and applying said collected liquid to said mat at the immediately preceding stage,
- removing said washed pulp from said wire as said wire wraps said couch roll,
- adding liquid to said collected pulp and delivering the resulting suspension to said inner surface of said lower wire run within said loop at a position adjacent said couch roll,
- draining liquid from said delivered suspension through said lower wire run to form thereon a mat of further washed pulp,
- applying additional washing liquid to said further washed pulp mat from above as said mat travels on said lower wire run toward said breast roll,
- draining said washing liquid through said lower wire run, and
- removing the resulting further washed pulp from said lower wire run and from within said loop.
- 2. A continuous process of washing and bleaching paper making pulp in combination with a driven endless foraminous wire having outer and inner surfaces and forming a loop enclosing and supported by horizontally spaced breast and couch rolls and including upper and lower wire runs traveling in opposite directions toward and away from said couch roll respectively, comprising the steps of:
- supplying a liquid suspension of pulp to be washed to said outer surface of said upper wire run adjacent said breast roll,
- causing liquid in said suspension to drain through said upper wire run and thereby forming a pulp mat thereon,
- applying washing liquid from above to said mat as said mat travels on said upper wire run toward said couch roll,
- draining said washing liquid through said upper wire run to form thereon a mat of washed pulp,
- collecting said drained liquid within said loop and removing said collected liquid from within said loop,
- removing said washed pulp from said wire as said wire wraps said couch roll,
- subjecting said removed pulp to a bleaching operation producing a liquid suspension of bleached pulp,
- delivering said bleached pulp suspension to said inner surface of said lower wire run within said loop at a position adjacent said couch roll,
- draining liquid from said bleached pulp through said lower wire run to form a mat of bleached pulp,
- applying washing liquid to said bleached pulp mat from above within said loop as said mat travels on said lower wire run toward said breast roll,
- draining said washing liquid from said bleached pulp mat, and
- removing the resulting washed and bleached pulp from said lower wire run and from within said loop.
RELATED APPLICATION
This is a division of application Ser. No. 07/877,716 filed May 4, 1992 now U.S. Pat. No. 5,275,024.
US Referenced Citations (10)
Divisions (1)
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Number |
Date |
Country |
Parent |
877716 |
May 1992 |
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