Particle-Filled Nonwoven Structure for Thermal and Dimensional Stability
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Solution Overview
Problem
Current non-woven products face challenges in achieving high mechanical and thermal stability while maintaining dimensional integrity, especially under stress and heat, due to limitations in connection points and density, which affects their suitability for applications like bituminous coating and insulation.
Innovation Solution
Incorporating particulate fillers with specific size distributions, including large particles and smaller particles, into the non-woven structure to increase connection points and improve cohesion, combined with a crosslinkable chemical binder, to enhance mechanical and thermal properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of stationary object
If the weight of non-woven components is reduced, then economic and environmental benefits are improved, but mechanical strength and thermal stability deteriorate
Solution Approach 1:
The patent applies composite materials by combining thermoplastic polymer fibers with mineral fillers (such as calcium carbonate, talc, or mica) and organic fillers (such as wood flour or cellulose). This composite structure allows the non-woven fabric to maintain mechanical strength and thermal stability while reducing weight, as the fillers provide structural support and the polymer matrix binds the components together effectively.
Solution Approach 2:
The patent utilizes parameter changes by controlling the melting temperature of the thermoplastic polymer to be higher than the decomposition temperature of the fillers. This parameter relationship ensures that during heat treatment, the polymer matrix remains intact and provides structural support while the fillers maintain their integrity, achieving both weight reduction and property preservation.
2Productivity
If production speed is increased, then productivity is improved, but mechanical needling and hydraulic bonding effectiveness deteriorate
Solution Approach 1:
The patent replaces mechanical needling and hydraulic bonding with thermal bonding mechanisms. The thermoplastic polymer fibers are heated above their melting temperature, causing them to soften and bond with adjacent fibers and fillers. This thermal bonding process is much faster than mechanical needling and can be easily controlled to ensure bonding effectiveness even at high production speeds.
Solution Approach 2:
The patent exploits phase transitions of the thermoplastic polymer, transitioning from solid to molten state during heat treatment. This phase change allows the polymer to flow and form strong bonds between fibers and fillers, then transitions back to solid state upon cooling, creating a stable bonded structure. This process is rapid and suitable for high-speed production.
3Stability of the object's composition
If chemical bonding is used to stabilize dimensions, then dimensional stability is improved, but formaldehyde content and environmental harm increase
Solution Approach 1:
The patent uses thermoplastic polymers that undergo irreversible thermal bonding without requiring formaldehyde-based crosslinking agents. The bonding is achieved through melting and solidification of the polymer, which does not produce harmful byproducts. This approach eliminates formaldehyde content while maintaining dimensional stability, aligning with environmental and health requirements.
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 significantly improves the mechanical and thermal stability, deformability, and dimensional stability of non-woven products, allowing them to perform better under stress and heat conditions without increasing surface mass or density.
Implementation Method 1
The melting temperature of the material(s) forming the mineral and/or organic particles is higher than the melting temperature of the material(s) forming the fibers or filaments of the layers
Implementation Method 2
at least partially coated or encapsulated by a material binder capable of connecting at least occasionally the filaments or fibers together
Data Source
Figure 1~2
Figure 3A~3B
Figure 4~5
AI summary
The present invention relates to a nonwoven product containing organic and/or mineral particles and its manufacturing process. A flexible nonwoven product, with a volumetric density of less than 1 and formed of at least two layers of synthetic fibers or filaments superimposed in the Z direction perpendicular to the XY plane of said product, having undergone at least one mechanical or hydraulic needle-punching operation, said nonwoven product further incorporating particulate fillers in the form of mineral and/or organic particles distributed unimodally or multimodally within this product and at least partially coated or encapsulated by a binding material capable of linking the filaments or fibers together at least at specific points, a nonwoven product characterized in that at least a population or fraction of the organic and/or mineral particles, referred to as "large particles", has a size such that: 3xSMf3≤v, preferably 5xSMf3≤v,where SMf corresponds to the average cross-section of the fibers or filaments forming the layers of the non-woven product and v represents the average individual volume of the organic or mineral particles.