Recyclable Dropper Design Using Homogeneous Polypropylene
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Solution Overview
Problem
Conventional droppers face issues with non-recyclability due to mixed materials, opacity in liquid measurement, fragility, and failure to meet recycling industry size requirements, leading to inefficient recycling and aesthetic concerns in the beauty industry.
Innovation Solution
A dropper design comprising a bulb made of INFUSE™ olefin block copolymer, a pipette made of NX® UltraClear™ polypropylene, and a cap made of polypropylene, all with a length of at least 2 inches, allowing for recyclability as a single unit, enhancing clarity and durability while maintaining recyclability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a dropper is made with mixed materials (polypropylene pipette, thermoplastic elastomer bulb), then functional performance is improved, but recyclability deteriorates
Solution Approach 1:
The dropper is made entirely of polypropylene material, eliminating material heterogeneity. The bulb, pipette, and cap are all constructed from the same recyclable polypropylene, allowing the entire dropper to be processed together in recycling facilities without separation requirements.
2Ease of manufacture
If a pipette is made of regular polypropylene, then manufacturing cost is reduced, but visibility of liquid amount deteriorates
Solution Approach 1:
The polypropylene material has different optical properties in different regions of the dropper. The bulb and cap remain opaque for structural integrity, while the pipette portion is made translucent to allow visualization of liquid volume without requiring different materials.
3Object-affected harmful factors
If a dropper is made of glass, then chemical protection is improved, but fragility and recyclability deteriorate
Solution Approach 1:
The material parameters of the dropper are optimized by using polypropylene with specific properties: chemical resistance comparable to glass, flexibility to prevent shattering, and recyclability. The polypropylene can be formulated to provide adequate chemical protection while maintaining mechanical toughness.
4Reliability
If dropper parts are separated for recycling, then material purity is improved, but part size falls below recycling thresholds
Solution Approach 1:
The bulb, pipette, and cap are designed as a unified polypropylene construction that can be processed together as a single recyclable unit. The entire dropper assembly meets the minimum dimension requirements for recycling facilities, eliminating the need for separation while maintaining material purity through homogeneous composition.
Data Source
AI summary
A dropper includes a bulb, a pipette coupled to the bulb, and a cap coupled to the bulb. The dropper is composed entirely of recyclable material having a same recycle code. The dropper has a length of greater than 2 inches. The dropper is recyclable as a single unit. In one embodiment, the pipette includes an undercut on an inside of the pipette nearest the bulb.