Fleece Bellows Material Web for Noise Insulation
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Solution Overview
Problem
Existing bellows solutions for public transport vehicles like trams and buses are costly and ineffective for noise insulation, making it impractical to implement double-corrugated designs for improved noise reduction.
Innovation Solution
A fleece-based material web with an elastomer coating and an adhesion promoter layer, featuring scrim layers with elastic and non-elastic threads, provides effective noise absorption and insulation while preventing elastomer penetration, ensuring a stable bond and high elasticity, suitable for cost-effective bellows configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If double-corrugated bellows are used for improved noise insulation, then acoustic insulation performance is improved, but manufacturing cost and device complexity increase
Solution Approach 1:
The patent uses a composite material structure consisting of a fleece reinforcement layer coated with elastomer on both sides. This single-layer composite design achieves the desired noise insulation properties without requiring complex double-corrugated structures, thereby reducing device complexity while maintaining acoustic performance.
2Productivity
If elastomer coating is applied directly to fleece using calender, then production efficiency is improved, but elastomer penetrates deeply into fleece reducing noise-absorbing effect
Solution Approach 1:
The patent introduces an adhesion promoter layer as an intermediary between the elastomer coating and the fleece reinforcement. This intermediate layer prevents the elastomer from penetrating deeply into the fleece during calendering while still allowing for effective bonding, thus maintaining both production efficiency and noise-absorbing properties.
3Object-affected harmful factors
If fleece with high permeability is used for noise absorption, then noise-absorbing effect is improved, but elastomer coating penetrates completely through fleece
Solution Approach 1:
The adhesion promoter layer serves as a barrier that prevents complete penetration of elastomer through the permeable fleece while maintaining the fleece's noise-absorbing capabilities. The intermediary layer allows the coating to bond effectively without compromising the structural integrity or compositional stability of the overall material web.
4Ease of manufacture
If simple single-layer bellows are used to reduce cost, then manufacturing cost is reduced, but noise insulation performance deteriorates
Solution Approach 1:
The patent creates a cost-effective single-layer bellows using composite materials - specifically a fleece reinforcement layer with elastomer coating. This design achieves noise insulation performance comparable to expensive double-corrugated bellows while simplifying manufacturing and reducing costs, thereby resolving the contradiction between ease of manufacture and noise insulation performance.
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 fleece-based material achieves comparable acoustic insulation to double-corrugated bellows, offering enhanced noise reduction and increased durability against vandalism and stress, while being cost-effective for implementation in trams and buses.
Implementation Method 1
an adhesion promoter layer being provided between the elastomer coating and the fleece
Implementation Method 2
The coating made of a plastic, for example EPDM or silicone, is relatively high-mass and therefore noise-insulating
Implementation Method 3
The fleece itself absorbs noises that occur as a scrim
Implementation Method 4
high elasticity is achieved in one direction, whereas in the other direction, in which the inextensible threads of such a non-woven fabric with several scrim layers, there is essentially no or only a very low extensibility
Data Source
Figure 1~2
Figure 3~4
AI summary
The invention relates to a material web (20) of a bellows (6) of a transition (3) between two articulated vehicles or material web of the canopy of a passenger boarding bridge or passenger stairs, wherein the material web (20) has at least one reinforcing layer which has an elastomer coating (21, 22) on both sides, wherein the at least one reinforcing layer is formed from a nonwoven fabric (9), wherein an adhesion promoter layer (7) is arranged between the nonwoven fabric (9) and the elastomer coating (21, 22), wherein the nonwoven fabric has at least one lay-up layer in which elastic threads are arranged.