Cosmetic Pen Sealing Arrangement for Airtightness
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Solution Overview
Problem
Conventional cosmetic pens have unreliable sealing arrangements, leading to air contact and degradation of cosmetic liquid due to leakage through outlet ports.
Innovation Solution
A cosmetic pen design featuring a hollow cap, plunger, conic member, biasing member, and sealing ring, where the annular projection compresses the biasing member to urge the plunger against the valve, preventing fluid communication through outlet ports in a closed state, ensuring airtightness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional sealing arrangement is used in the cosmetic pen, then the structure is simple, but the sealing reliability is poor allowing air to enter and cosmetic liquid to degrade
Solution Approach 1:
The sealing system is divided into multiple independent sealing components: a sealing ring at the front end of the plunger, membranes at the outlet ports, and a flexible hollow member in the cap. This segmentation allows each component to perform its specific sealing function, improving overall reliability while maintaining manageable complexity through modular design
Solution Approach 2:
The biasing member is pre-loaded to maintain continuous compression between the plunger and valve, ensuring the sealing ring remains pressed against sealing surfaces before any leakage can occur. This preliminary action ensures the sealing function is active and reliable throughout operation
2Ease of operation
If the plunger is allowed to move freely for application, then the ease of operation is good, but air can enter through outlet ports causing oxidation of the applicator and degradation of cosmetic liquid
Solution Approach 1:
Flexible membranes are installed at the outlet ports of the valve. These membranes allow the plunger to move freely for application while preventing air from entering through the outlet ports. The membranes flex during operation but maintain the barrier against air contact, protecting the applicator from oxidation and cosmetic liquid from degradation
Solution Approach 2:
The sealing ring acts as an intermediary element between the plunger and the valve, creating a sealed interface that allows plunger movement while preventing air leakage. This intermediary component enables both ease of operation and protection against harmful air contact
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 sealing arrangement is reliable, preventing air from entering the pen tube and maintaining the cosmetic liquid's integrity, ensuring it does not contact air and remains fresh.
Implementation Method 1
a biasing member put on the tubular member and having a front end urging against the annular projection
Data Source
AI summary
A cosmetic pen includes a hollow cap; a hollow plunger including, on an outer surface, a front annular groove, an annular flange configured to urge against an internal shoulder of the hollow cap, a rear tubular member, and an annular projection; a hollow conic member urging against the annular flange; an applicator; a biasing member put on the tubular member and having a front end urging against the annular projection; a hollow valve put on both the annular projection and the biasing member, the hollow valve including rear outlet ports; a hollow member fastened in the hollow cap; a sealing ring disposed tightly between a front end of the hollow plunger and an inner surface of the hollow conic member; and a pen tube. Airtightness of the pen tube is sound in a closed state.