Lyocell-Reinforced Textile Support to Prevent Yarn Breakage
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Solution Overview
Problem
Existing textile supports for bituminous membranes face issues with mechanical fragility and dimensional instability due to the use of glass reinforcement yarns, which are prone to breakage during the manufacturing and installation processes, leading to structural failures and increased production costs.
Innovation Solution
A textile support composed of a non-woven web of synthetic fibers with continuous high modulus reinforcement yarns made of cellulose filaments, specifically Lyocell fibers, which are mechanically needled or water-entangled and stabilized with a thermal treatment and chemical binder, providing enhanced mechanical and thermal properties without the fragility of glass yarns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If glass reinforcement yarns are used to achieve high elastic modulus and low cost, then stiffness and dimensional stability are improved, but mechanical fragility increases causing yarn breakage during manufacturing and installation
Solution Approach 1:
The patent changes the material parameter from glass to cellulosic fiber, transforming the reinforcement yarn from brittle to flexible while maintaining high elastic modulus through specific fiber selection and processing parameters
Solution Approach 2:
The patent creates a composite textile support combining cellulosic fiber reinforcement yarns with synthetic fiber substrate, merging the advantages of natural fiber flexibility with synthetic fiber durability to achieve both dimensional stability and mechanical reliability
2Stability of the object's composition
If glass reinforcement yarns are used to achieve high elastic modulus, then dimensional stability is improved, but production costs increase due to yarn breakage and lower quality supports
Solution Approach 1:
The patent changes the material parameter from glass to cellulosic fiber, eliminating manufacturing losses from yarn breakage while maintaining dimensional stability, thereby reducing production costs and improving manufacturing efficiency
3Stability of the object's composition
If glass reinforcement yarns are used to achieve high elastic modulus, then dimensional stability is improved, but mechanical strength increases only in transverse sense due to low elongation at break
Solution Approach 1:
The patent changes the material parameter from glass to cellulosic fiber, increasing elongation at break from 2.5-3.5% to 10-15%, which enables the reinforcement yarns to effectively increase mechanical strength in the longitudinal sense while maintaining dimensional stability
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 use of cellulose-based reinforcement yarns increases dimensional stability and mechanical strength, reduces the risk of yarn fractures, and lowers production costs by minimizing weight and twist density, resulting in improved performance and efficiency compared to glass-reinforced supports.
Implementation Method 1
the mechanical properties of the cellulosic fibers in relation to humidity absorption are of particular interest
Implementation Method 2
The assembly, made up of layers of non woven web and reinforcement yarns, is bound by means of mechanical needling, with needling density between 20 and 150 stitches/cm2, or water entangling and then stabilized with a thermal treatment at the temperature of 200-250° C.
Implementation Method 3
consolidated using a chemical binder
Implementation Method 4
The textile substrates and the reinforcement yarns are joined by means of mechanical needling or water entangling
Data Source
AI summary
A reinforced textile support, particularly for bituminous membranes, made of at least one layer of polyester non woven web and continuous high modulus reinforcement yarns longitudinally set with respect to said layer. The reinforcement yarns consist of cellulosic fiber multi-filaments of the Lyocell type. The assembly is bound by mechanical needling or water entangling, stabilized by means of thermal treatment at a temperature of 200-250° C. and consolidated by means of a chemical binder.