Trigger Sprayer Homogeneous Polypropylene Design
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Solution Overview
Problem
Traditional trigger sprayers often incorporate metal parts, such as steel springs and steel balls, which increase costs, complexity, and reduce recyclability, due to the use of multiple materials and components.
Innovation Solution
A trigger sprayer design utilizing a single plastic material, where all components, including valves, piston, and spring, are made from polypropylene, with integrated valve and spring mechanisms, reducing part count and assembly complexity, and enabling easier recycling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If metal parts (steel springs, steel balls) are used in trigger sprayers, then functional performance and reliability are improved, but manufacturing cost and device complexity increase
Solution Approach 1:
The patent applies homogeneity by making all components of the trigger sprayer (valve body, piston, spring, trigger lever, biasing member) from the same plastic material (polypropylene). This eliminates material incompatibility issues between metal and plastic parts, simplifies manufacturing, and allows the entire assembly to be molded as a single piece, thereby reducing device complexity while maintaining functional performance.
Solution Approach 2:
The patent merges multiple separate components (valve body, piston, spring, trigger lever) into a single integrated molded part. The biasing member is formed as an integral part of the trigger lever, and all components are made from the same material, allowing them to be produced as one unified structure rather than assembled from multiple parts, thus reducing device complexity.
2Reliability
If multiple materials (metal and plastic) are used in trigger sprayers, then functional performance is improved, but manufacturing cost increases
Solution Approach 1:
The patent eliminates the use of multiple materials by making all components from the same plastic material (polypropylene). This single-material approach simplifies the manufacturing process, eliminates the need for expensive metal parts and complex assembly operations, and reduces manufacturing costs while maintaining all necessary functional properties through careful design of the plastic components.
Solution Approach 2:
The patent replaces expensive metal components with cheaper plastic alternatives that can be molded economically. The use of polypropylene, a cost-effective thermoplastic, allows for low-cost production of all sprayer components through injection molding, significantly reducing manufacturing costs compared to traditional metal-based designs.
3Reliability
If metal parts are used in trigger sprayers, then functional performance is improved, but recyclability deteriorates
Solution Approach 1:
The patent makes the entire trigger sprayer assembly from a single plastic material (polypropylene), which is fully recyclable. This homogeneous material composition allows the entire product to be processed through standard plastic recycling streams, unlike mixed-material assemblies with metal parts that are difficult or impossible to recycle. The functional performance is maintained through optimized plastic component design.
4Device complexity
If integrated valve and spring mechanisms are used, then device complexity is reduced, but manufacturing precision requirements increase
Solution Approach 1:
The patent combines multiple components (valve body, piston, spring, trigger lever) into a single molded part, reducing device complexity. The integrated design eliminates assembly steps and potential misalignment issues, while the molding process inherently provides the necessary precision through tooling. The biasing member is formed as an integral part of the trigger lever, further simplifying the structure.
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
This design lowers production costs, simplifies assembly, and enhances recyclability by using a single material, while maintaining functional performance and reducing compatibility issues with the product being dispensed.
Implementation Method 1
The trigger may include an integral trigger lever and biasing member or spring. When actuated, the trigger lever stresses the biasing member which may move within the shroud. The biasing member may be configured to return the trigger lever to a non-actuated position when force on the trigger lever is released.
Data Source
AI summary
A trigger sprayer (100) may include a tube retainer (110) fitted in a valve body (120), a piston (140) fitted in the valve body and an integrated trigger (150) and biasing member (154) connected to the piston and the valve body and biased in part by the attachment of a shroud (130) to the trigger sprayer.