Glass Roller-Ball Applicator Preventing Plastic Leaching
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Solution Overview
Problem
Traditional roller-ball applicators are unsuitable for topical oils like essential oils due to impregnation and chemical leaching issues with plastics, leading to loose assemblies and contamination.
Innovation Solution
A roller-ball applicator with a housing made from homopolymer polypropylene and a glass or metal roller-ball, designed to maintain structural integrity and prevent chemical leaching, allowing for secure and effective application of topical oils regardless of orientation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If traditional plastic housing is used in roller-ball applicators, then the assembly is easy to manufacture and assemble, but the plastic becomes impregnated with essential oils causing the roller-ball to become loose and potentially dislodge
Solution Approach 1:
The patent removes the plastic housing component entirely from the system. Instead of using a plastic housing to hold the roller-ball, the invention uses a glass vial with a crimped cap assembly that mechanically secures the roller-ball through a press-fit connection. This extraction of the problematic plastic material eliminates the impregnation issue while maintaining the structural function of holding the roller-ball securely.
Solution Approach 2:
The patent changes the material parameter of the housing from plastic to glass. Glass does not absorb essential oils like plastic does, thereby maintaining the elasticity and structural integrity of the housing over time. This material substitution resolves the degradation issue while preserving the housing's function of containing and securing the roller-ball mechanism.
2Device complexity
If traditional plastic housing is used in roller-ball applicators, then the structure is simple and cost-effective, but essential oils act as solvents leaching unwanted chemicals from the plastics into the oils
Solution Approach 1:
The patent extracts the plastic housing from the system and replaces it with a glass vial. This removal eliminates the source of chemical leaching, as glass does not contain the additives and polymers that can be dissolved by essential oils. The crimped cap assembly and roller-ball mechanism are retained, maintaining functional complexity while eliminating chemical contamination risks.
Solution Approach 2:
The patent introduces an intermediary barrier between the essential oil and any potential contamination sources. The glass vial acts as a non-reactive container that prevents direct contact between the oil and plastic materials. Additionally, the crimped cap creates a sealed environment that further isolates the oil from external contaminants.
3Ease of manufacture
If plastic housing is used, then initial assembly is straightforward, but the elasticity of the plastic relaxes over time causing excessive looseness
Solution Approach 1:
The patent removes the elastic plastic housing material from the system. Instead, it uses a rigid glass vial with a crimped metal cap assembly that provides mechanical retention through interference fit and deformation of the crimped edges. This eliminates the time-dependent relaxation issue inherent in elastic plastics while maintaining ease of assembly through the crimping process.
Data Source
AI summary
Applicator devices for applying topical oils to an individual are presented. Exemplary applicators may include a topical oil container, and a roller-ball applicator coupled to the container. The roller-ball applicator may include, a roller-ball housing, wherein the roller-ball housing includes a well configured to hold topical oil for application to an individual regardless of the orientation of the roller-ball applicator, and a roller-ball within the housing, the roller-ball being freely rotatable within the housing.