MULTI-LAYER WEB FORMATION SECTION

Multi-layer web formation section having at least two successive wire units (300, 310) having one wire (11) in common. A first headbox (100) supplies fibre pulp to the forward end of the first wire unit (300) and a second headbox (110) supplies a new fibre pulp layer to the forward end of the second...

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Bibliographische Detailangaben
Hauptverfasser:	POIKOLAINEN, ANTTI, RAISANEN, KARI
Format:	Patent
Sprache:	eng ; fre
Schlagworte:	METHODS OF PRODUCING PAPER THEREON PAPER-MAKING PAPER-MAKING MACHINES PRODUCTION OF CELLULOSE TEXTILES
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Beschreibung
Zusammenfassung:	Multi-layer web formation section having at least two successive wire units (300, 310) having one wire (11) in common. A first headbox (100) supplies fibre pulp to the forward end of the first wire unit (300) and a second headbox (110) supplies a new fibre pulp layer to the forward end of the second wire unit (310) atop a first partial web (W1) formed in the first wire unit (300). The forward end of a two-wire stretch of the second wire unit (310) has a first non-pulsating dewatering zone (Z1b) comprising at least one first formation shoe (200b), having a curved cap (201) on the side of the new fibre pulp layer. Openings (202) extending through the cap (201). An under-pressure (P) acts through the cap's (201) openings (202). A two-wire stretch of the second wire unit (310) has a second pulsating dewatering zone (Z2b), formed by fixed dewatering lists (210b), with gaps (220b) between and an under-pressure (Pb) affecting in these.