Woven Innerduct Using Multiple-Inserted Yarns for Cable Segregation
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Solution Overview
Problem
Existing woven textile fabric innerduct structures face challenges in reducing pulling tension for cable installation while maintaining strength and stability, as reducing rigidity compromises seam strength, filling tensile strength, and abrasion resistance.
Innovation Solution
Incorporating multiple-inserted multifilament yarns in the filling of the textile fabric, specifically a combination of monofilament and multifilament yarns with double-insertions, to provide the necessary bulk and flexibility, reducing filling rigidity and pulling tension without compromising strength and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If the rigidity in the filling direction of the textile fabric is reduced by decreasing the number of filling yarns per inch, then the pulling tension required to install cables is lowered, but the seam strength, filling tensile strength, filling tear strength, abrasion resistance, and processability of the fabric are compromised
Solution Approach 1:
The patent applies composite materials by combining monofilament and multifilament yarns in the filling direction of the woven textile fabric. Specifically, it uses a combination of monofilament yarns (which provide strength and stability) and multifilament yarns (which provide flexibility and bulk). This composite yarn structure allows the fabric to simultaneously achieve low pulling tension through the flexibility of multifilament yarns while maintaining seam strength, tensile strength, and abrasion resistance through the reinforcement of monofilament yarns.
Solution Approach 2:
The patent applies local quality by creating different yarn characteristics in different regions of the filling direction. The fabric incorporates alternating sequences of monofilament and multifilament yarns, where monofilament yarns are placed in regions requiring strength (such as seam areas and high-stress zones) while multifilament yarns are placed in regions requiring flexibility (such as cable passage zones). This localized differentiation of yarn properties allows the fabric to optimize both pulling tension reduction and strength maintenance in their respective critical areas.
2Ease of operation
If the rigidity in the filling direction is reduced to allow compartments to open more readily, then cable installation becomes easier, but the stability and structural integrity of the innerduct are compromised
Solution Approach 1:
The patent uses composite materials combining monofilament and multifilament yarns to achieve both flexibility for easy cable installation and structural integrity for stability. The multifilament yarns provide the necessary flexibility and bulk that allow compartments to open readily during cable installation, while the monofilament yarns maintain the structural integrity and stability of the innerduct structure throughout the installation process and in service.
Solution Approach 2:
The patent applies parameter changes by carefully controlling the denier, texture, and arrangement of both monofilament and multifilament yarns. The multifilament yarns are selected with parameters that provide adequate flexibility and bulk for compartment opening, while the monofilament yarns are selected with parameters that ensure structural stability. The weaving parameters (pick density, tension, pattern) are also optimized to balance flexibility and stability, creating a fabric that is both easy to operate with and structurally sound.
Data Source
AI summary
An innerduct for segregating cables in a conduit is provided wherein the innerduct is constructed from one or more strip-shaped lengths of a woven textile fabric and configured to provide multiple longitudinal compartments for the cables, and the textile fabric has a warp of monofilament yarn ends and a filling of a combination of monofilament and multifilament yarn picks, with the multifilament yarn picks being multiple-inserted yarns.