Multi-layer web formation section

Details Multi-layer web formation section Multi-layer web formation section

2011-04-26

2011-04-26

Fortuna, José A (Department: 1741)

Paper making and fiber liberation

Processes and products

Multi-layer waterlaid webs or sheets

C162S133000, C162S209000, C162S217000, C162S289000, C162S352000, C162S358300, C162S363000, C162S361000

Reexamination Certificate

active

07931777

ABSTRACT:
A multi-layer web formation section has two successive wire units (300, 310) with a common wire (11). A first headbox (100) supplies fiber pulp to the first wire unit (300) forming a first partial web (W1). A second headbox (110) supplies a new fiber pulp layer to the forward end of the second wire unit (310) atop the first partial web. A first non-pulsating dewatering zone (Z1b) in the forward end of a two-wire stretch of the second wire unit (310) has a first formation shoe (200b) with a curved cap (201) placed on the side of the new layer having openings (202) extending through the cap (201) with an under-pressure (P) affecting therethrough. A two-wire stretch of the second wire unit (310) has a second pulsating dewatering zone (Z2b) formed by fixed dewatering lists (210b), between which there are gaps (220b) and an under-pressure (Pb) affecting in these.

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