MULTI-LAYER WEB FORMATION SECTION

MULTI-LAYER WEB FORMATION SECTION

Multi-layer web formation section having at least two successive wire units (300, 310). A first headbox (100) supplies a pulp suspension jet to the forward end of the first wire unit (300) to form a first partial web (W1). A second headbox (110) supplies a pulp suspension jet into a jaw (G2) at the...

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Hauptverfasser: POIKOLAINEN, ANTTI, RAISANEN, KARI
Format: Patent
Sprache:eng ; fre
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METHODS OF PRODUCING PAPER THEREON
PAPER-MAKING
PAPER-MAKING MACHINES
PRODUCTION OF CELLULOSE
TEXTILES
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creator POIKOLAINEN, ANTTI
RAISANEN, KARI
description Multi-layer web formation section having at least two successive wire units (300, 310). A first headbox (100) supplies a pulp suspension jet to the forward end of the first wire unit (300) to form a first partial web (W1). A second headbox (110) supplies a pulp suspension jet into a jaw (G2) at the forward end of the second wire unit (310) to form a second partial web (W2). The second partial web (W2) is joined to the first partial web (W1) at a joi nt (N1) in between the second wire unit (310) and a bottom wire (11). In the forward end of a two-wire stretch of the second wire unit (310) there is a first non-pulsating dewatering zone (Z1b), which is formed by a fixed first formation shoe (200b), which has a curved cap (201) placed against one side of the two-wire stretch and provided with openings (202) extending through the cap (201), and an under-pressure (P) affecting through the cap~s (201) openings (202). A two-wire stretch of the second wire unit (310) has a secon d pulsating dewatering zone (Z2b), which is formed by fixed dewatering lists (210b) in the cross machine direction, between which there are gaps (220b), and an under-pressure (Pb) affecting in these.
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subjects METHODS OF PRODUCING PAPER THEREON
PAPER-MAKING
PAPER-MAKING MACHINES
PRODUCTION OF CELLULOSE
TEXTILES
title MULTI-LAYER WEB FORMATION SECTION
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