Suction roll in a machine for producing a fibrous web

a technology of suction roll and fibrous web, which is applied in the direction of drying machine, press section, light and heating apparatus, etc., can solve the problems of insufficient removal of boundary air layer between paper web and roll or fabric which rests on it, difficulty in transfer of paper web, and inability to quickly remove boundary air layer or fabric, etc., to achieve the effect of reliably transferring over the web width
US20070084580A1Inactive Publication Date: 2007-04-19VOITH PATENT GMBH
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Patent Information

Authority / Receiving Office
US · United States
Patent Type
Applications(United States)
Current Assignee / Owner
VOITH PATENT GMBH
Publication Date
2007-04-19
Estimated Expiration
Not applicable · inactive patent

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Abstract

The present invention provides a suction roll system in a drying section of a machine for manufacturing a fibrous web, the suction roll system including a suction roll having an outer circumferential surface. The circumferential surface defines holes configured for attracting the fibrous web by suction and includes regions, more than two of the regions including the holes, at least two of the regions relative to one another having different numbers of the holes per unit area or having the holes with different diameters per unit area. The circumferential surface has strips which extend in a circumferential direction, at least one strip which extends in a helical shape over the circumferential surface, or strips which extend either substantially in a direction of a longitudinal axis of the suction roll or diagonally relative to the longitudinal axis. The regions include the strips. The strips have an increased number of the holes per unit area in comparison with the remaining regions between the strips or have the holes with greater diameters in comparison with the remaining regions.
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Description

CROSS REFERENCE TO RELATED APPLICATIONS

[0001] This is a continuation of PCT application No. PCT / EP2005 / 051308, entitled “SUCTION ROLL IN A MACHINE FOR PRODUCING A FIBROUS WEB”, filed Mar. 22, 2005.BACKGROUND OF THE INVENTION

[0002] 1. Field of the Invention

[0003] The invention relates to a suction roll system in a drying section of a machine for manufacturing a paper, cardboard, tissue or other fibrous web, including a suction roll which has holes in its outer circumferential surface for attracting the fibrous web by suction.

[0004] 2. Description of the Related Art

[0005] DE 100 47 369 A1 describes a drying cylinder for drying a material web which serves, in particular, for guiding and holding a paper web which has a drying gas applied to it. The drying cylinder has a cover, over which the material web is guided during operation of the roll, in a manner which wraps partially around the roll in the process. There are gas passage openings in the cover. There is a second gastight co...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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