Two-Layer Industrial Fabric with Separation and Approach Zones
Solution Overview
Problem
Industrial papermaking fabrics face challenges in achieving uniform water drainage, surface smoothness, and fiber support due to uneven mesh spaces and yarn interactions, leading to issues with dehydration efficiency and paper quality, especially with the increased use of waste paper containing minute fibers.
Innovation Solution
A two-layer fabric design with alternating separation and approach portions between wefts, featuring a unique weaving pattern with contiguously arranged warps and wefts, forming three-dimensional dehydration spaces and crimp structures to enhance surface properties and fiber support, while maintaining uniform water drainage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If additional wefts of small diameter are placed between wefts to improve surface smoothness and fiber supporting property, then the fabric becomes excellent in surface smoothness and fiber supporting property, but mesh spaces become uneven leading to insufficient dehydration in some portions
Solution Approach 1:
The fabric is divided into multiple functional zones: separation portions where wefts are spaced apart to provide large mesh spaces for dehydration, approach portions where wefts approach each other for surface smoothness, and floating portions connecting them. This segmentation allows different regions to fulfill different functions simultaneously.
Solution Approach 2:
Different portions of the fabric have different structural characteristics tailored to local requirements: separation portions have larger mesh spaces optimized for water drainage, while approach portions have tighter weft arrangement optimized for surface smoothness and fiber support. Each local region has quality optimized for its specific function.
2Manufacturing precision
If wefts are arranged closely together to improve surface smoothness, then surface smoothness improves, but mesh spaces become insufficient leading to poor dehydration property
Solution Approach 1:
The fabric structure dynamically transitions between separation portions (wide mesh spaces) and approach portions (narrow mesh spaces) along the weft direction. This dynamic variation in mesh space configuration allows the fabric to simultaneously provide surface smoothness where needed and adequate dehydration capacity where required.
Solution Approach 2:
The invention utilizes the third dimension (vertical height) by creating floating portions where wefts pass over multiple warps without interlacing, forming three-dimensional space structures. This adds vertical dehydration pathways complementing the horizontal mesh spaces, enhancing overall dehydration capability without compromising surface smoothness.
3Manufacturing precision
If the fabric structure is made complex with alternating separation and approach portions to achieve uniform dehydration and surface smoothness, then dehydration uniformity improves, but fabric structure complexity increases
Solution Approach 1:
The fabric employs periodic alternation between separation portions and approach portions along the weft direction, creating a repeating pattern that ensures uniform distribution of dehydration functionality across the entire fabric surface. This periodic structure achieves dehydration uniformity through regular alternation of wide and narrow mesh space zones.
Solution Approach 2:
The invention merges multiple functions into a single integrated fabric structure: separation portions provide dehydration, approach portions provide surface smoothness, and floating portions provide both structural connection and additional dehydration pathways. This merging eliminates the need for separate components while achieving multiple objectives simultaneously.
Data Source
Figure 1~2
Figure 3~4
Figure 5A~5R
AI summary
A two layer fabric has first, second, third and fourth upper side wefts contiguously and repeatedly arranged. Each of three contiguously arranged warps forms a knuckle over second, over third, and over second upper side wefts respectively to form a separation portion. At both sides of the separation portion, both the second and third upper side wefts form a float portion by passing over two or more warps. Adjacent to the float portion, one warp passes over the second and third upper side wefts successively and one or two warps adjacent thereto pass over the second or the third upper side weft to form an approach portion where the second and third upper side wefts approach. Crimp portions are formed to sandwich the separation portion where the first and fourth upper side wefts pass over warps which are common to those of the separation portion.