Patent · US Expired

Twin wire former for the production of a fiber web from a fiber suspension

US6776877B2 · kind B2 · utility

1Cited by

13References

24Claims

0Family size

Assignee

Voith Paper Patent GmbH · DE

Inventors

Joachim Grabsoheid · Gerstetten, DE
Volker Schmidt-Rohr · Heidenheim, DE
Johann Moser · Heidenheim, DE

Key dates

Filing date	Feb 13, 2002
Grant date	Aug 17, 2004
Priority date	—
Expiry date	Feb 13, 2022

Classification

Technology area (CPC D)Textiles; Paper
CPC primaryD21F9/003
WIPO fieldTextile and paper machines
WIPO sectorMechanical engineering

Abstract

The invention relates to a twin wire former for the production of a fiber web specifically a paper, cardboard or tissue web, from a fiber suspension. The invention is characterized in thatthe rotating forming roll has an open volume and is a non-suction type;the rotating forming roll has a forming roll diameter of less than 1,400 mm;the rotating forming roll has a forming roll angle of wrap of less than 70°;a forming suction box is located immediately downstream from the rotating forming roll as viewed in direction of wire travel; andin the area of the wedge-shaped inlet nip, the fiber stock suspension has a stock density of between 0.4% and 2.0%, preferably between 0.6% and 1.5%.These characteristics result in an improved forming quality and web quality.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.