Patterned Nonwoven Hook Engagement Surfaces With Fiber Retention
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Solution Overview
Problem
Conventional nonwoven hook-and-loop fasteners face challenges in maintaining adhesive strength while minimizing fiber pull-out, which affects their holding power and visual appearance, and there is a need to reduce material and manufacturing costs.
Innovation Solution
A nonwoven element with a fiber pile composed of a homogeneous mixture of multi-component fibers and a polyolefinic monofiber, featuring a pattern of open and bonded areas, is designed to enhance adhesive strength and reduce fiber pull-out, using a combination of air-through bonding and thermal calendering to achieve optimal mechanical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a particularly high degree of bonding is applied to prevent fiber pull-out in conventional nonwoven fabrics, then fiber retention is improved, but hook penetration effectiveness deteriorates and visual appearance, tactile properties, and air permeability are impaired
Solution Approach 1:
The nonwoven fabric is segmented into distinct bonded areas and open areas. Bonded areas provide strong fiber retention to prevent pull-out, while open areas maintain large volume and porosity to allow effective hook penetration and engagement. This spatial segmentation resolves the contradiction by providing different local properties in different regions of the fabric.
Solution Approach 2:
Different regions of the nonwoven fabric are given different bonding densities and structural properties. Bonded areas have high fiber connectivity for retention, while open areas have lower bonding and higher porosity for hook engagement. This local differentiation allows the fabric to simultaneously satisfy conflicting requirements of fiber retention and hook penetration effectiveness.
2Reliability
If structured textiles are used to create hook-and-loop fastener areas, then holding power is improved, but manufacturing cost increases
Solution Approach 1:
The invention changes key structural parameters of the nonwoven fabric, including fiber arrangement patterns, bonding density distribution, and area ratios of bonded to open regions. By optimizing these parameters, the fabric achieves holding power comparable to structured textiles while maintaining the manufacturing advantages of nonwoven production methods.
Solution Approach 2:
The nonwoven fabric functions as a composite structure combining bonded and open areas with different properties. This composite approach allows the material to exhibit enhanced mechanical performance and holding power similar to structured textiles, while being produced through more cost-effective nonwoven manufacturing processes.
3Reliability
If excessive bonding is applied to nonwoven fabrics, then fiber pull-out is reduced, but the visual appearance and tactile properties deteriorate
Solution Approach 1:
The fabric surface is segmented into bonded areas that provide fiber retention and open areas that maintain aesthetic and tactile qualities. This segmentation allows the fabric to exhibit desirable visual appearance and soft tactile properties in open regions while ensuring fiber retention in bonded regions.
Solution Approach 2:
The invention creates a patterned structure that copies the beneficial properties of highly bonded fabrics only where necessary (in bonded areas), while leaving other areas (open areas) with more open, aesthetically pleasing structures. This selective copying resolves the contradiction between fiber retention and visual/tactile properties.
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 solution provides improved adhesive strength and reduced fiber pull-out, maintaining the nonwoven's mechanical integrity and breathability while minimizing material usage and production costs.
Implementation Method 1
the nonwoven layer is compressed to a reduced thickness in the bonded areas
Implementation Method 2
using a combination of air-through bonding and thermal calendering
Implementation Method 3
using a combination of air-through bonding and thermal calendering
Data Source
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AI summary
The invention relates to a nonwoven element (1) for forming at least one hook engagement surface for a hook and loop fastener, comprising at least one nonwoven layer formed from a fiber pile (2) which extends in a longitudinal direction (MD) and a transverse direction (CD) and has a thickness (H) perpendicular thereto. The fiber pile (2) comprises a plurality of plastic fibers (5), wherein the nonwoven layer has a pattern of open areas (3) for the engagement of hook elements (7) of a hook and loop fastener and bonded areas (4) surrounding the open areas (3) and having a smaller thickness (D2). According to the invention, the fiber pile (2) is formed from a homogeneous fiber mixture with a first fiber component and a second fiber component. The first fiber component comprises 20 wt.% to 80 wt.% of the fibers.-% of the fiber mixture and is formed from a multi-component fiber, in particular a bi-component fiber, with a first polymer material and a polyolefinic second polymer material. The melting point of the first polymer material is higher than the melting point of the second polymer material. The fiber mixture further comprises a second fiber component consisting of a monofiber made of a polyolefinic third polymer material.