Woven Fabric Sheet Plies Void Volume Dewatering
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Solution Overview
Problem
Existing fabric designs for paper, board, tissue, or pulp web production do not provide sufficient void volume for effective dewatering, especially in demanding applications, and are not economically efficient in production.
Innovation Solution
A fabric with a flat woven base material that includes additional sheet-like plies, which can be positioned inside or outside the folded layers, providing increased void volume without requiring extensive void volume from the base weave, allowing for an inexpensive production process and potentially combining woven and nonwoven materials for enhanced properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a two ply base structure with seam loops is used, then the fabric is easier to handle and seamable, but the void volume is insufficient for effective dewatering
Solution Approach 1:
The patent incorporates sheet plies within the folded layers of the two ply base structure, creating a nested configuration where additional void-providing layers are positioned inside the existing structure. This allows the fabric to maintain its seamable two ply configuration while internally accommodating additional sheet plies that increase the overall void volume for improved dewatering performance
Solution Approach 2:
The patent adds sheet plies as a separate dimensional element within the folded structure, transitioning from a simple two-layer configuration to a multi-layer composite structure. This dimensional addition provides extra void space without altering the fundamental two ply base structure that enables easy handling and seamability
2Volume of stationary object
If a complex multilayer woven structure is used to increase void volume, then dewatering properties improve, but production cost and complexity increase
Solution Approach 1:
The patent divides the void volume provision function into two separate components: the simple two ply base structure handles the structural and seamability requirements, while separate sheet plies handle the void volume provision. This segmentation allows each component to be optimized independently, keeping the base weave simple for easy production while adding void volume through separate sheet layers
Solution Approach 2:
The two ply base structure serves multiple functions simultaneously: it provides the structural framework, enables easy handling and seamability, and when combined with sheet plies, provides the void volume. This multi-functionality eliminates the need for complex specialized weaves designed solely for void volume provision
Data Source
AI summary
A fabric for a machine to produce a fiber web, especially a paper-, board-, tissue- or pulp web, is formed of a flat woven base material having a top side and a bottom side, two terminal ends separated in a machine direction, folds formed in the flat woven base material being separated in the machine direction by the folding defining an inside between the two folded layers and an outside. The two terminal ends are located under the bottom side surface, wherein the two terminal ends one of are adjacent to each other or overlap each other, seam loops located at the folds characterized in that the fabric further has one, two or more sheet-like plies. Also a method to produce a fiber web, especially a paper-, board-, tissue- or pulp web is carried out with a machine that is provided with at least one such novel fabric.