Hot Press Cushioning Material Using Stacked Para-Aramid Nonwoven Fabrics
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Solution Overview
Problem
Existing hot press cushioning materials fail to maintain high cushioning properties and durability under high temperature conditions, leading to issues like fiber powder generation and adhesion, which limits their long-term use in manufacturing precision equipment parts.
Innovation Solution
A stacked structure of nonwoven fabrics is used, with copolymerized para-aramid fibers forming outer layers and more rigid fibers as the inner layer, providing a heat-resistant temperature of 270°C or more and a basis weight of 80 to 400 g/m², preventing fiber deformation and adhesion, and maintaining high cushioning properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If meta-aromatic polyamide fibers are used in hot press cushioning materials, then cushioning properties are provided, but thermal degradation occurs at high temperatures causing fiber powder generation and adhesion
Solution Approach 1:
The patent employs a composite structure consisting of a base fabric layer and a heat-resistant fiber layer. The base fabric provides cushioning properties while the heat-resistant fiber layer (made of para-aramid or meta-aramid fibers) protects against thermal degradation at high temperatures. This composite approach allows the material to simultaneously achieve both cushioning functionality and thermal stability without fiber powder generation or adhesion.
2Object-generated harmful factors
If adhesive is applied to fiber surface to prevent powder generation, then fiber adhesion improves, but adhesive delamination occurs at high temperatures
Solution Approach 1:
The patent removes the adhesive component from the system entirely. Instead of applying adhesive to bind fibers and prevent powder generation, the invention uses a mechanically bonded composite structure where heat-resistant fibers are integrated into the base fabric through needling or weaving. This eliminates the high-temperature delamination issue inherent in adhesive-based solutions while still preventing fiber powder generation through the structural integrity of the composite material.
3Productivity
If cushioning material is used under high temperature conditions, then hot press function is achieved, but long-term durability decreases due to thermal degradation
Solution Approach 1:
The patent changes the material parameters by selecting fibers with specific thermal properties. The heat-resistant fiber layer uses para-aramid or meta-aramid fibers that maintain their mechanical properties at high temperatures (up to 200-300°C), whereas conventional fibers would degrade. This parameter change in fiber selection enables the cushioning material to withstand high-temperature hot press conditions while maintaining long-term durability and preventing thermal degradation over extended use.
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 ensures high cushioning properties and extended durability under high temperature conditions, preventing fiber powder generation and adhesion, while maintaining voids and suppressing fluffing and tearing, thus enhancing the productivity of laminate manufacturing.
Implementation Method 1
providing a heat-resistant temperature of 270°C or more... preventing fiber deformation and adhesion
Implementation Method 2
A stacked structure of nonwoven fabrics is used... maintaining voids and suppressing fluffing and tearing... providing high cushioning properties
Data Source
Figure 1~2
AI summary
A hot press cushioning material (14a) includes: a first nonwoven fabric (15) forming an inner layer; and second nonwoven fabrics (16a, 16b) placed on both surfaces of the first nonwoven fabric (15) and forming outer layers. Copolymerized para-aramid fibers having a basis weight of 80 to 400 g/m2 are used as a material of the second nonwoven fabrics (16a, 16b). Fibers that are more rigid than the copolymerized para-aramid fibers are used as a material of the first nonwoven fabric (15). Each of the first nonwoven fabric (15) and the second nonwoven fabrics (16a, 16b) has a heat resistant temperature of 270°C or more.