Fiber Cushioning Material With Melt-Bonded Binder for Shape Stability
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Solution Overview
Problem
Existing cushioning materials with granular binders lack sufficient impact-cushioning performance and shape stability, as the binder primarily maintains structure rather than contributing effectively to cushioning performance.
Innovation Solution
A cushioning material comprising first fibers, such as cellulose, and second fibers with a core-sheath structure, where the cover layer acts as a binder through thermal melt-bonding, enhancing stiffness and impact absorbency by preferentially melting the cover layer to bind the fibers, thereby improving shape stability and cushioning performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If a granular binder is used to maintain the shape of the structure, then shape stability is improved, but impact-cushioning performance deteriorates
Solution Approach 1:
The invention changes the physical form of the binder from granular to fibrous, and modifies the melting characteristics by using a bicomponent fiber structure with different melt temperatures. The low-melt component (first fiber) melts at a lower temperature to provide cushioning, while the high-melt component (second fiber) maintains structural integrity, thus resolving the contradiction between shape stability and impact-cushioning performance
Solution Approach 2:
The binder is constructed as a composite material using bicomponent fibers with different thermal properties. The first fiber (low-melt) and second fiber (high-melt) are combined in a single binder fiber, allowing the binder to simultaneously provide both cushioning (through low-melt component) and shape maintenance (through high-melt component) functions
2Speed
If the binder melting rate at the surface is higher than at the center, then bonding speed is improved, but bonding uniformity deteriorates
Solution Approach 1:
The invention uses a bicomponent fiber structure where the first fiber melts at a lower temperature than the second fiber. This differential melting behavior allows the low-melt component to rapidly bond at the surface while the high-melt component provides sustained bonding throughout the web thickness, achieving both fast initial bonding and uniform overall bonding
Solution Approach 2:
Different parts of the binder fiber have different melting characteristics - the first fiber portion melts at lower temperature for rapid surface bonding, while the second fiber portion melts at higher temperature for uniform through-thickness bonding. This local differentiation of melting properties resolves the contradiction between bonding speed and bonding uniformity
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 cushioning material achieves improved stiffness, shape stability, and enhanced impact-cushioning performance due to the increased bonding points and high bonding strength between the fibers, resulting in superior load support and sinking resistance.
Implementation Method 1
the cover layer acts as a binder through thermal melt-bonding, enhancing stiffness and impact absorbency by preferentially melting the cover layer to bind the fibers
Data Source
Figure 1
Figure 2~3
AI summary
A cushioning material includes a first fiber and a second fiber having a core portion and a cover layer covering the core portion and containing a polyester. The cover layer functions as a binder for melt-bonding a plurality of first fibers.