Polymeric Valve Assembly for Recyclable Aerosol Venting
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Solution Overview
Problem
Current aerosol dispensers face challenges in achieving recyclability and cost-effectiveness due to the use of diverse materials, particularly the need for a valve assembly that can be recycled as a single unit and safely vent at excessive temperatures/pressures, while minimizing metal components.
Innovation Solution
A valve assembly design featuring a polymeric construction with a valve body comprising hoop members, a resilient member, and a valve seal, which allows for safe venting and recyclability, and is integrated with a polymeric container to reduce material complexity and environmental impact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional metallic containers and valve assemblies are used, then structural strength and reliability are improved, but recyclability and cost-effectiveness deteriorate due to multiple material types requiring separate recycling streams
Solution Approach 1:
The patent combines the valve cup, valve seal, and resilient member into a single integrated valve assembly made entirely of polymeric materials. This merging of components and materials allows the entire valve assembly to be recycled as a single unit with the polymeric container, eliminating the need for separate metal recycling streams while maintaining structural integrity through the cooperative function of the integrated components
Solution Approach 2:
The patent employs composite polymeric structures, particularly the valve seal made from thermoplastic elastomer that combines the sealing properties of rubber with the recyclability of thermoplastics. This composite material approach provides both the elasticity needed for sealing and the melt-processability required for single-stream recycling
2Reliability
If multiple material types (metal and polymeric) are used in valve assembly, then functional performance is improved, but device complexity and environmental impact worsen due to material diversity
Solution Approach 1:
The patent applies homogeneity by making the entire valve assembly from polymeric materials rather than combining metal and polymer components. The valve cup, valve seal, and resilient member are all polymeric, creating a homogeneous material composition that simplifies manufacturing, assembly, and recycling processes while maintaining functional performance through proper material selection and component design
3Reliability
If cross-linked elastomers are used for valve seal, then sealing reliability is improved, but recyclability deteriorates because cross-linked materials cannot be remelted
Solution Approach 1:
The patent changes the material parameter from cross-linked (vulcanized) elastomer to thermoplastic elastomer. This parameter change maintains the elastic sealing properties needed for reliable sealing while enabling the material to be remelted and recycled through conventional thermoplastic processing methods, thus resolving the contradiction between sealing reliability and recyclability
Data Source
Figure 1
Figure 2A~2B
Figure 3A~3B
AI summary
A valve assembly for a dispenser. The valve assembly includes a valve body. The valve body includes a first hoop member, a second hoop member, and a transition portion defined by the joining of the first hoop member and the second hoop member. The first hoop member includes a first hoop outer portion positioned, a first hoop inner portion, a first hoop upper surface, and a first hoop lower surface. The second hoop member includes a second hoop outer portion, a second hoop inner portion, a second hoop upper surface, and a second hoop lower surface. The second hoop inner portion extends about the longitudinal axis defining a passageway. The passageway comprises a first passageway opening, a second passageway opening opposite the first passageway opening, and a passageway surface extending from the first passageway opening to the second passageway opening.