Snap-on Vial Cap with Elastic Engagement for Controlled Removal
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Solution Overview
Problem
Existing snap-on vial caps face issues with inconsistent adhesive strength due to uneven molding accuracy and ultrasonic welding variability, leading to difficulties in removing and reattaching protective covers, which can result in contamination or accidental detachment.
Innovation Solution
A snap-on vial cap design featuring a cap body and protective cover molded integrally using thermoplastic synthetic resin, with elastic engagement pieces and a tapered through hole, allowing for consistent removal with a constant force and preventing accidental reattachment, ensuring the protective cover remains secure until administration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If ultrasonic welding is used to fix the protective cover on the cap body, then the protective cover can be securely attached, but the adhesive strength becomes inconsistent due to molding accuracy variations and welding unit output changes
Solution Approach 1:
The invention divides the attachment system into two independent components: a cap body and a protective cover that can be separated. The protective cover can be removed from the cap body and reattached as needed, providing flexibility while maintaining secure attachment when closed. This segmentation allows the user to control the attachment state manually rather than relying on consistent welding strength.
Solution Approach 2:
The invention creates a dynamic attachment system where the protective cover can transition between attached and detached states. The snap-on structure allows easy attachment and detachment without requiring precise welding control, making the system adaptable to different usage scenarios while maintaining reliability.
2Ease of operation
If the protective cover is formed separately and attached to the cap body, then the cover can be removed and reattached, but it cannot be assured that the rubber stopper will not be contaminated
Solution Approach 1:
The protective cover is pre-formed as a separate component with a specific shape designed to fit over the cap body's opening. This preliminary preparation allows the cover to be easily attached to the cap body, creating a sealed configuration that protects the rubber stopper from contamination during storage and transport.
Solution Approach 2:
The protective cover is designed to nest over the cap body opening, creating a layered protection system. The cover fits snugly over the cap body, forming a nested structure that seals the opening and prevents contaminants from reaching the rubber stopper while allowing easy removal when needed.
3Strength
If adhesive strength is increased to prevent accidental detachment, then the protective cover remains secure, but the cover cannot be removed when needed
Solution Approach 1:
The invention creates a dynamic attachment system where the protective cover can transition between attached and detached states. The snap-on structure allows easy attachment and detachment without requiring precise welding control, making the system adaptable to different usage scenarios while maintaining reliability.
Solution Approach 2:
The invention divides the attachment system into two independent components: a cap body and a protective cover that can be separated. The protective cover can be removed from the cap body and reattached as needed, providing flexibility while maintaining secure attachment when closed. This segmentation allows the user to control the attachment state manually rather than relying on consistent welding strength.
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 ensures the protective cover can be removed and reattached reliably, preventing contamination and facilitating easy handling while maintaining airtightness until use, addressing the issues of inconsistent adhesive strength and contamination risks.
Implementation Method 1
a plurality of elastic engagement pieces (13) extending upward from an upper limit of the ridge (12)
Implementation Method 2
a tapered through hole (10), allowing for consistent removal with a constant force
Data Source
Figure 1
Figure 2
Figure 3
AI summary
There is provided a snap-on vial cap with a protective cover, which can be removed from a cap body by a constant removal force, and can hardly be attached to the cap body again, once being removed. A cap body (5) and a protective cover (6) are molded integrally by an insert molding method or a two-color-molding method, which generates moderate adhesive strength therebetween. An annular convex portion (12, 13) having a concave section (14) formed on the outer circumferential surface thereof is provided on the cap body (5), and an engagement portion (18) for engaging with the concave section (14) is provided on the protective cover (6), thereby enabling the protective cover 6) to be easily removed from the cap body (5) with good operability while preventing the protective cover (6) from accidentally detaching. Alternatively, projections (23) provided on a top plate of the cap body (5) are engaged into a plug (4) to prevent the cap (1) from rotating.