Core-Shell Fiberball Structure for Textile Insulation
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Solution Overview
Problem
Conventional fiberballs have low cohesion, making them poorly suited for flat textile materials as they tend to slip, and their production is complex, with fiber ends prone to kinking or bending during handling and processing.
Innovation Solution
Fiberballs with a core-shell structure, where the fiber density in the core region is higher than in the shell region, and at least 50% of the fibers have a length of at least 60 mm, combined with binder fibers and optionally further fibers, are produced using a carding machine adapted for fiberball formation and processed through air-laying and thermal bonding to create a nonwoven fabric with improved mechanical and insulation properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional fiberballs are used, then the production process is simple, but the fiberballs have low cohesion and tend to slip in flat textile materials
Solution Approach 1:
The fiberballs are segmented into a core region and a shell region with different fiber density characteristics. The core region has a higher fiber density while the shell region has a lower fiber density, creating a heterogeneous structure that improves cohesion without requiring complex production equipment
Solution Approach 2:
Different regions of the fiberball are assigned different local qualities: the core region has high fiber density for structural stability, while the shell region has low fiber density for flexibility and bonding capability. This local differentiation resolves the contradiction between cohesion and production simplicity
2Strength
If fiberballs with protruding fiber ends are used to improve connection, then the connection between fiberballs is improved, but the fiber ends can kink or bend during transport, storage and processing
Solution Approach 1:
The shell region acts as a cushioning layer that protects the core region and prevents fiber ends from kinking or bending during handling. The lower density shell provides a buffer zone that absorbs mechanical stresses before they reach the more vulnerable fiber ends
3Temperature
If voluminous nonwovens with high thermal insulation are produced, then the insulation quality is improved, but the weight increases
Solution Approach 1:
The fiberballs inherently possess a porous structure with air pockets between fibers that provide thermal insulation. The core-shell configuration optimizes this porosity, maintaining high insulation performance while controlling the overall weight of the nonwoven fabric
Solution Approach 2:
The nonwoven fabric is a composite material system consisting of multiple fiberball types with different densities. This composite structure allows optimization of the weight-insulation trade-off by combining lightweight shell regions with insulating core regions in specific proportions
4Reliability
If high proportion of recycled or biodegradable fibers are used, then ecological requirements are met, but the mechanical properties and washing stability may be compromised
Solution Approach 1:
The mechanical properties are optimized by controlling critical parameters such as fiber length (at least 60 mm for 50% of fibers) and fiber density distribution in the core-shell structure. These parameter optimizations ensure that recycled or biodegradable fibers achieve the required mechanical strength and washing 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 core-shell fiberballs provide enhanced mechanical stability, washing resistance, and thermal insulation with a low weight, suitable for applications in sportswear, outdoor clothing, and insulation materials, while being made from recycled or biodegradable fibers, offering improved washability and resistance to fiber migration.
Implementation Method 1
carding the fiber material, wherein a carding machine is employed that has been adapted to the formation of fiberballs
Implementation Method 2
processing the nonwoven fabric raw material in the device in an air-laying method, the nonwoven fabric raw material passing through the gap between the spiked rollers
Implementation Method 3
thermally bonding so as to obtain the volume nonwoven fabric
Data Source
Figure 1
AI summary
The present invention relates to fiberballs having a core region and a shell region with a special structure, to a process for the production of such fiberballs, a nonwoven fabric, a thermally insulating wadding and a textile article comprising such fiberballs and to the use of the fiberballs for the production of textile articles and for thermal and/or acoustic insulation.