Polyester Sound-Absorbing Air Duct Without Separate Adhesives
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Solution Overview
Problem
Conventional sound-absorbing air ducts for vehicles made from synthetic resins like PVC and PU release volatile organic compounds (VOCs) during incineration and are difficult to recycle due to material separation issues, and they require separate adhesive materials for assembly, complicating manufacturing.
Innovation Solution
A sound-absorbing air duct composed of polyester fibers with a low melting point, using a combination of high and low melting point polyester fibers in non-woven fabrics and films, eliminating the need for separate adhesives and enabling easy recycling, with improved thermal adhesion and heat resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If conventional synthetic resins (PVC, PU) are used for sound-absorbing air ducts, then sound absorption performance is achieved, but volatile organic compounds are released during incineration and recycling is difficult
Solution Approach 1:
The patent changes the material parameter from conventional synthetic resins (PVC, PU) to polyester-based resins with different melting points. This parameter change enables both reduced VOC emissions during incineration and improved recyclability, as polyester materials can be more easily separated and recycled compared to conventional plastics.
Solution Approach 2:
The patent uses composite materials consisting of polyester fibers with different melting points (high melting point polyester for structural integrity, low melting point polyester for adhesion). This composite approach allows the material to perform multiple functions while maintaining environmental benefits of reduced VOC emissions and improved recyclability.
2Strength
If separate adhesive materials are used for assembling air duct components, then bonding strength is achieved, but manufacturing complexity increases
Solution Approach 1:
The patent merges the adhesive function into the polyester fiber material itself by utilizing the low melting point polyester's ability to act as a natural adhesive during heat bonding. This eliminates the need for separate adhesive materials, reducing manufacturing complexity while maintaining bonding strength between non-woven fabric layers and the film.
Solution Approach 2:
The low melting point polyester fiber serves itself as both structural material and adhesive agent. During the heat bonding process, the low melting point polyester melts and bonds the components together, eliminating the need for external adhesive materials and simplifying the overall material system.
3Temperature
If high melting point polyester fibers are used alone, then thermal stability is improved, but adhesion between components deteriorates
Solution Approach 1:
The patent creates a composite fiber system combining high melting point polyester (for heat resistance and structural stability) with low melting point polyester (for thermal adhesion). The high melting point polyester maintains structural integrity at elevated temperatures, while the low melting point polyester provides bonding capability during assembly through heat fusion.
Solution Approach 2:
The patent applies different melting point properties to different functional requirements within the same material system. The low melting point polyester provides localized adhesion functionality at bonding interfaces, while the high melting point polyester provides overall thermal stability and structural support throughout the air duct components.
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 provides a recyclable sound-absorbing air duct with enhanced thermal properties and simplified manufacturing, effectively absorbing engine noise and airflow noise while minimizing VOC emissions and adhesive requirements.
Implementation Method 1
a second polyester fiber containing a polyester resin having a low melting point and having a softening point of 100° C. to 150° C.
Implementation Method 2
improved thermal adhesion and heat resistance, such that a separate adhesive material is not required for adhesion between components of the air duct
Implementation Method 3
a lower non-woven fabric and an upper non-woven fabric sandwiching wires therebetween; wherein each of the lower and upper non-woven fabrics includes a mixture between a first polyester fiber and a second polyester fiber
Data Source
AI summary
A sound-absorbing air duct for a vehicle includes a lower non-woven fabric and an upper non-woven fabric sandwiching wires therebetween; and a film made of a polyester resin having a low melting point and disposed on the upper non-woven fabric, wherein each of the lower and upper non-woven fabrics includes a mixture between a first polyester fiber containing a polyester resin having a melting point higher than 250° C. and a second polyester fiber containing a polyester resin having a low melting point and having a softening point of 100° C. to 150° C., wherein the second polyester fiber includes a polyester resin having a low melting point composed of: an acid component including terephthalic acid or an ester-forming derivative thereof; and a diol component including 2-methyl-1,3-propanediol, 2-methyl-1,3-pentanediol, and ethylene glycol.