Twisted Polyamide Cable Winding Tape Abrasion Resistance
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Solution Overview
Problem
Existing cable wrapping tapes for automobiles lack sufficient abrasion resistance while maintaining low cost and pliancy, especially in high-stress engine compartment applications.
Innovation Solution
The filaments of the polyamide yarns are twisted about a central longitudinal axis to increase cohesion and abrasion resistance, achieving up to double the abrasion resistance of standard tapes without adding thickness or complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the yarn weight is increased to improve abrasion resistance, then the tape thickness increases, but the pliancy and ease of operation deteriorates
Solution Approach 1:
The patent applies parameter changes by twisting the filaments around a central longitudinal axis at specific angles (30° to 60°) and with controlled twist densities (10 to 400 turns per meter). This transforms the yarn structure parameters to achieve enhanced abrasion resistance while preserving flexibility and pliancy, resolving the contradiction between strength and ease of operation.
2Strength
If a velour- or nonwoven-layer is added to improve abrasion resistance, then the tape thickness increases, but the manufacturing cost and complexity increase
Solution Approach 1:
The patent extracts and eliminates the need for separate velour or nonwoven layers by integrating the abrasion-resistant functionality directly into the yarn structure through filament twisting. This simplifies the overall tape structure while maintaining high abrasion resistance, resolving the contradiction between strength and device complexity.
3Strength
If the filament twist density is increased to improve abrasion resistance, then the yarn becomes less pliable, but the ease of operation deteriorates
Solution Approach 1:
The patent optimizes the twist density parameter within a specific range (10 to 400 turns per meter) and controls the twist angle (30° to 60°) to achieve the best balance between abrasion resistance and pliancy. This parameter optimization ensures high abrasion resistance while maintaining ease of manual and machine processing, resolving the contradiction between strength and ease of operation.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The twisted yarn structure enhances abrasion resistance to class G levels while maintaining low thickness and cost-effectiveness, ensuring the tape remains pliable and easy to process, suitable for high-stress applications like engine compartments.
Implementation Method 1
The filaments are twisted with one another about a central longitudinal axis of the yarn
Data Source
AI summary
A cable wrapping tape, in particular for the engine compartment of an automobile, has a strip-like carrier consisting of fabric, said carrier is provided at least on one side with a self-adhering adhesive layer which consists of a pressure-sensitive adhesive, wherein the fabric of the carrier consists of a yarn which is formed from a polyamide material and which has a yarn strength of at least 280 dtex. The yarn is formed from 24 to 80 filaments, and the cable wrapping tape meets abrasion class E according to LV 312 both on a mandrel having a 5 mm diameter and on a mandrel having a 10 mm diameter. For increasing the abrasion resistance, it is proposed that the filaments are twisted with one another about a central longitudinal axis (X-X) of the yarn.