Metal Cap Vent Protrusion Inversion for Liner Protection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional metal caps for bottles risk liner slippage or damage during unsealing and insertion due to vent hole design, leading to potential liner separation and friction issues, making the cap work process troublesome.
Innovation Solution
A metal cap design with vent holes featuring upper and lower protrusions positioned to prevent liner catching and falling off, along with a sliding and sealing layer configuration to facilitate smooth unsealing and insertion, where the upper protrusion is bent inward and the lower protrusion serves as a guide to prevent contact with the liner.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If vent holes are formed by pressing and bending cut sections to create protrusions, then internal pressure can be released and gas discharged, but the liner may be caught at the distal ends of the protrusions causing bending, separation, or damage
Solution Approach 1:
Instead of having the protrusion tip point inward toward the liner (which causes catching and damage), the protrusion is designed with its tip pointing outward or parallel to the bottle axis. This inverts the traditional protrusion orientation, eliminating the harmful catching effect while preserving the vent hole's pressure release function.
Solution Approach 2:
The protrusion geometry is specifically modified at its tip region to have a different orientation (outward or axial) compared to its base region. This local differentiation ensures that the vent hole structure maintains its pressure release capability while the modified tip area prevents liner damage by avoiding inward pointing sharp edges.
2Object-affected harmful factors
If slits are formed after prearrangement of the liner, then the liner can be protected from catching and damage, but the cap work process becomes troublesome and complex
Solution Approach 1:
The protrusions are pre-formed during cap manufacturing with their tips oriented outward or parallel to the bottle axis, before the liner is inserted. This preliminary configuration of the protrusions eliminates the need for complex post-arrangement processes, as the vent hole structure is already optimized to prevent liner damage from the start.
Solution Approach 2:
The cap structure itself, through its pre-formed protrusion geometry, provides the protection function that would otherwise require additional processing steps. The outward-pointing protrusions inherently prevent liner catching and damage, making the system self-protecting without needing separate liner protection mechanisms or complex assembly procedures.
3Reliability
If the distal end of the upper protrusion is positioned inward, then the liner can engage with the upper surface during unsealing to prevent falling off, but the liner may still catch on the breaking portions and separate
Solution Approach 1:
The protrusion tip orientation is inverted from the conventional inward-pointing design to an outward-pointing or axially-parallel design. This inversion eliminates the breaking portions that cause liner separation while the protrusion body maintains engagement capability during unsealing operations.
Solution Approach 2:
The geometric parameters of the protrusion are changed, specifically the tip orientation angle and position. By adjusting these parameters to create outward-pointing or axially-aligned tips, the design achieves both reliable liner engagement during unsealing and prevention of liner separation, resolving the contradiction between engagement and separation risks.
Data Source
AI summary
The present invention relates to a metal cap which seals the mouth of a bottle for drinking or the like, and a bottle with the cap which is furnished therewith.