Polymeric Foam Dispenser Bellows for Narrow-Neck Containers
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Solution Overview
Problem
Conventional reciprocating foam dispensers rely on metallic components, which are difficult to recycle, and require complex redesigns for adjusting foam characteristics, are limited to larger container neck sizes, and suffer from leakage and mechanical stress issues.
Innovation Solution
A polymeric, reciprocating pump design using a bellows-style spring as both a biasing member and air chamber, with reconfigured fluid flow paths and a locking collar to minimize plastic mass and prevent leakage, allowing adjustment of foam characteristics without altering the pump's shape or size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If metallic components are used in reciprocating foam dispensers, then reliability and mechanical strength are improved, but recyclability deteriorates
Solution Approach 1:
The patent removes all metallic components from the reciprocating foam dispenser, extracting the problematic metal spring and replacing it with a polymeric bellows mechanism. This extraction eliminates the recyclability barrier while maintaining the essential reciprocating pump function through the bellows' expansion and contraction movements.
Solution Approach 2:
The patent combines multiple functions into polymeric components: the bellows serves as both the biasing member (replacing the metal spring) and the air chamber, eliminating the need for separate metal parts. This merging achieves both recyclability through single-material construction and reliable mechanical function through the integrated polymeric structure.
2Stability of the object's composition
If conventional rigid cylinder designs are used for air and liquid chambers, then structural stability is improved, but adaptability to different container sizes deteriorates
Solution Approach 1:
The patent replaces rigid cylindrical chambers with a dynamic bellows structure that can expand and contract. This dynamic design allows the air chamber volume to adjust automatically based on container size and product requirements, enabling the same pump mechanism to adapt to various container configurations while maintaining structural integrity through the bellows' flexible yet strong polymeric construction.
3Ease of manufacture
If separate air and liquid chambers are used, then functional clarity is improved, but device complexity increases
Solution Approach 1:
The patent merges the air chamber and liquid chamber functions into a single integrated pump head structure. The bellows serves as the air chamber while working in direct conjunction with the liquid intake mechanism, eliminating the need for separate enclosed air and liquid chambers. This reduces the number of parts and assembly steps while maintaining clear functional separation through the pump's operational sequence.
4Force
If metallic springs are used as biasing members, then mechanical force reliability is improved, but recyclability and material compatibility deteriorates
Solution Approach 1:
The patent substitutes the metallic spring mechanical system with a polymeric bellows mechanism. The bellows provides the necessary biasing force through its elastic expansion and contraction, replacing the coil spring's mechanical action. This substitution maintains reliable force generation while using only polymeric materials that can be recycled together as a single material stream.
5Ease of operation
If foam dispensers are designed for upright reciprocating operation, then dispensing control is improved, but design complexity for foam creation increases
Solution Approach 1:
The patent segments the foam creation process into distinct functional zones within the pump head: an air intake region, a liquid intake region, and a mixing chamber. The reciprocating plunger creates alternating suction phases that separately draw air and liquid into the mixing chamber, then combines them during the return stroke. This segmentation enables controlled foam generation in an upright reciprocating dispenser without excessive complexity.
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 design achieves recyclable, low-profile dispensers that can fit narrow-necked containers, reduce plastic use, and maintain foam quality with adjustable air-to-liquid ratios, while preventing leakage and mechanical stress on the biasing member.
Implementation Method 1
a polymeric, reciprocating pump design using a bellows-style spring as both a biasing member
Implementation Method 2
foams can be created by mixing a prepackaged fluid with air drawn from the ambient environment. Volumetrically, more air than liquid is normally used to form these foams
Data Source
Figure 1A~2B
Figure 3A~3B
Figure 4
AI summary
An all-plastic, reciprocating foam dispenser (1) is contemplated. The dispenser (1) relies upon a bellows (30) that also serves as the air chamber/cylinder, thereby eliminating the need for complex valving while also reducing total plastic mass and shortening the axial profile of the dispenser. In this manner, the dispenser (1) can be coupled to narrow-necked containers (≤ 40 mm diameter) and dispense large doses (≥ 1.2 mL). A locking collar (40) secures the pump in a sealed, up-locked position, while also providing greater flexibility to adjust the air-to-liquid ratio to help impart the desired consistency to the dispensed foam product.