Paper machine forming fabric with controlled porosity

US5169709A · kind A · utility

Assignee

• Wangner Systems Corporation · US

Inventor

• Thomas B. Fleischer · Dresden, DE

Key dates

• Filing date: Oct 16, 1991
• Grant date: Dec 8, 1992
• Expiry date: Oct 16, 2011

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T442/3211
• WIPO field: Textile and paper machines
• WIPO sector: Mechanical engineering

Abstract

A multi-layer paper machine fabric having a preselected permeability value and an increased weft wise stiffness including a single system of warp threads and multiple layers of weft threads including at least support surface weft threads, intermediate layer weft threads and lower surface weft threads interwoven with the warp threads. The surface layer weft threads are arranged to have at least a first thickness and the intermediate layer and lower surface weft threads are arranged to have a second and equal thickness greater than the first thickness of the surface layer weft threads. The second thickness is selected relative to the first thickness to achieve the preselected permeability value and the preselected weft wise stiffness value of the paper machine fabric. Alternate ones of the support layer weft threads are arranged in vertically stacked rows with the intermediate and lower layer weft threads and intermediate ones of the support layer weft threads are arranged between the vertical rows.