Woven Fabric Band with Segmented Longitudinal Threads
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Solution Overview
Problem
Paper machine woven fabric bands face challenges in maintaining tensile strength due to abrasion of second longitudinal threads, which absorb significant tensile forces and experience wear over time, limiting flexibility and optimal structure adaptation.
Innovation Solution
The division of second longitudinal threads into outer and inner groups allows for functional separation, where outer threads provide abrasion resistance and inner threads maintain tensile strength, with adaptable materials like polyamide and copolymers enhancing durability and flexibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If second longitudinal threads are used to bind the woven fabric layers and provide abrasion resistance, then abrasion resistance is improved, but tensile strength decreases over time due to abrasion wear
Solution Approach 1:
The second longitudinal threads are segmented into two distinct groups: outer second longitudinal threads that float on the machine side to provide abrasion resistance, and inner second longitudinal threads that bind within the woven fabric band to maintain tensile strength. This segmentation allows each thread group to perform its specific function optimally without compromising the other.
Solution Approach 2:
Different regions of the second longitudinal threads are assigned different functions and properties. The outer threads are optimized for abrasion resistance through their floating configuration on the machine side, while the inner threads are optimized for tensile strength through their binding configuration within the band structure. This local differentiation of quality resolves the contradiction between abrasion resistance and tensile strength.
2Object-affected harmful factors
If second longitudinal threads float on the machine side to improve abrasion resistance, then abrasion resistance is improved, but the threads are exposed to wear and reduce in cross-section over operating time
Solution Approach 1:
The second longitudinal threads are divided into outer and inner groups, where only the outer threads float on the machine side and are exposed to abrasion, while the inner threads remain protected within the band. This segmentation ensures that the threads providing abrasion resistance do not compromise the durability of the overall structure, as the inner threads maintain structural integrity.
Solution Approach 2:
The woven fabric band utilizes a composite structure combining different thread configurations within the same material system. The outer second longitudinal threads provide abrasion resistance through floating, while the inner second longitudinal threads provide structural durability through binding, creating a composite effect that achieves both abrasion resistance and long-term reliability.
3Manufacturing precision
If a two-layer woven fabric structure is used to optimize paper side formation, then formation quality is improved, but the band becomes stiffer and more difficult to install
Solution Approach 1:
The two-layer woven fabric structure is segmented into a first woven fabric layer for paper side formation and a second woven fabric layer for machine side durability. The first layer includes first longitudinal and transverse threads optimized for paper formation, while the second layer includes second longitudinal threads with floats for abrasion resistance. This segmentation allows each layer to be optimized for its specific function while maintaining overall installability.
Solution Approach 2:
Different layers of the woven fabric band are assigned different local qualities and structures. The first layer is optimized for paper side formation with appropriate thread density and configuration, while the second layer is optimized for machine side durability with floating second longitudinal threads. This local differentiation allows the band to achieve both formation quality and operational ease.
Data Source
AI summary
A woven fabric band having a first and a second woven fabric layer having second longitudinal and second transverse threads, the outer side of the second woven fabric layer being formed by floats of longitudinal threads, wherein the longitudinal threads form a first longitudinal thread group with outer longitudinal threads and a second longitudinal thread group with inner longitudinal threads and that the outer longitudinal threads form the outer side of the second layer and the inner longitudinal threads extend within the band.