Elastic Nonwoven Web Stabilization for Deformable Fabric Forming
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Solution Overview
Problem
Current methods for stabilizing high modulus textile fabrics, such as those used in ballistic vests, face challenges in maintaining dimensional stability and integrity when forming three-dimensional shapes, often resulting in distorted materials with gaps due to the lack of precise alignment and handling issues.
Innovation Solution
A process involving the use of an elastic nonwoven web with a lower softening temperature than the reinforcing fibers, which is thermally tacked onto the fabric, providing stabilization and enabling precise alignment and deformation without losing integrity, allowing for the production of both two- and three-dimensional shaped articles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If conventional stabilization methods are used, then dimensional stability is improved, but the fabric cannot be deformed into three-dimensional shapes without distortion and gaps
Solution Approach 1:
The elastic nonwoven web is applied to the reinforcing fabric before deformation and molding. This preliminary stabilization layer maintains dimensional stability during the forming process, enabling the fabric to be deformed into three-dimensional shapes without distortion or gaps while preserving alignment precision
Solution Approach 2:
The elastic nonwoven web acts as an intermediary between the reinforcing fibers and the final shaped article. It provides a stabilizing matrix that holds the reinforcing fibers in precise alignment during deformation, allowing the fabric to adapt to three-dimensional shapes while maintaining structural integrity
2Stability of the object's composition
If the nonwoven web is heated to bonding temperature, then stabilization is achieved, but excessive melting causes fiber separation and gaps
Solution Approach 1:
The softening temperature of the elastic nonwoven web is specifically selected to be lower than that of the reinforcing fibers. This parameter differentiation enables selective bonding of the nonwoven web to the fabric at controlled temperatures, achieving stabilization without excessive melting that would cause fiber separation and maintain precise alignment
Solution Approach 2:
The elastic nonwoven web provides localized stabilization at the interface with the reinforcing fibers. By bonding only the nonwoven web to the fabric surface through controlled heating, the reinforcing fibers maintain their precise alignment while the nonwoven web provides the stabilizing matrix, preventing fiber separation
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
This process enhances the stability and handling of high modulus fabrics, enabling the production of precise three-dimensional shapes with improved alignment and reduced distortion, suitable for applications like ballistic vests and automotive components.
Implementation Method 1
heating the structure from step 2 to a temperature between the softening temperature and melting temperature of the elastic nonwoven web
Implementation Method 2
heating the structure from step 2 to a temperature between the softening temperature and melting temperature of the elastic nonwoven web
Data Source
AI summary
A process for producing a stable fabric comprising: 1) providing a first fabric formed from reinforcing fibers, 2) providing an elastic nonwoven web produced from elastic fibers, having softening temperature lower than said reinforcing fibers, on at least 1 one side of said first fabric to form a structure, 3) heating said structure to a temperature between the softening temperature and melting temperature of said nonwoven web, and 4) cooling said structure to thereby provide a stable two-dimensional fabric. In the preferred embodiment, the structure of step 2) is put into a mold prior to heating step 3), heating said structure in the mold according to step 3), cooling said structure in the mold according to step 4) and thereby providing a three-dimensional shaped article. A product is also provided produced by these processes.