Woven Fabric with Balanced Diagonal Twill Lines
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Solution Overview
Problem
Woven fabrics with strong diagonal twill lines are conducive to sheet building but difficult to guide on paper machines due to their directional nature.
Innovation Solution
A woven fabric design featuring first and second diagonal twill lines with CD vector components of opposite signs, where the sum of CD vector components of the first diagonal twill lines is balanced with those of the second diagonal twill lines, allowing for easier guidance on paper machines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If diagonal twill lines are formed with strong directional orientation, then sheet building capability is improved, but ease of guidance on paper machine deteriorates
Solution Approach 1:
The twill lines are segmented into multiple groups with different orientations. Instead of having all twill lines oriented in one direction, the invention divides them into first groups extending in a first direction and second groups extending in a second direction, creating a more balanced structural distribution that reduces directional bias while maintaining sheet building effectiveness.
Solution Approach 2:
The invention introduces asymmetric orientation distribution by creating twill lines in multiple directions rather than a single dominant direction. This asymmetric arrangement of directional components balances the fabric's directional properties, reducing the strong directional orientation that causes guidance difficulties while preserving the sheet building capability through maintained twill line density and distribution.
2Productivity
If strong diagonal twill lines are used, then sheet building is enhanced, but fabric directionality increases making it difficult to guide
Solution Approach 1:
The fabric structure is segmented into multiple twill line groups with different orientations. By dividing the twill lines into first groups and second groups extending in different directions, the invention reduces the overall directional complexity while maintaining the sheet building function through the combined effect of multiple oriented segments.
Solution Approach 2:
The invention changes the orientation parameter of twill lines by introducing multiple directional angles. Instead of maintaining a single strong directional parameter, the fabric employs varying orientation parameters across different twill line groups, which reduces net directionality while preserving sheet building capability through the cumulative effect of multiple oriented structures.
Data Source
AI summary
A woven fabric is used in a machine to produce a fiber web. The woven fabric has a machine direction, a cross machine direction, a paper side and a machine side. The paper side is formed by interwoven warp yarns and weft yarns. The paper side contains a plurality of twill lines, each twill line being formed by a plurality of neighboring flotations of warp yarns. The twill lines contain an MD vector component directed in the machine direction and a CD vector component directed in the cross machine direction. At least some twill lines are diagonal twill lines meaning that the CD vector component is unequal to zero. The plurality of diagonal twill lines contains first diagonal twill lines and second diagonal twill lines, the CD vector components of the first diagonal twill lines have an opposite sign to the CD vector components of the second diagonal twill lines.