Can Cap Sealing Layer Structure for Lower Opening Torque
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Solution Overview
Problem
Conventional caps for can containers face issues with high opening torque and instability due to thick hard sliding layers, which require excessive capping pressure, and thinning the sliding layer compromises moldability.
Innovation Solution
A cap design featuring a disk-shaped top plate and cylindrical skirt with a sliding layer and sealing layer, where the sliding layer has a thin portion on the outer peripheral edge, allowing for reduced deformation load during capping and improved moldability, while the sealing layer ensures effective sealing with a thicker portion for stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the thickness of the hard sliding layer is increased, then the slidability with respect to the top plate portion is improved, but the load required for drawing the corner portion of the cap body increases
Solution Approach 1:
The sliding layer is designed with non-uniform thickness, being thicker at the center portion and thinner at the outer peripheral portion. This local quality variation allows the center to provide sufficient slidability while the thinner edges reduce the load during corner drawing, resolving the contradiction between slidability and drawing load
2Force
If the thickness of the hard sliding layer is decreased, then the load required for drawing the corner portion is reduced, but the moldability of the sliding layer deteriorates
Solution Approach 1:
By making the sliding layer thicker at the center, the patent ensures sufficient moldability and structural integrity during manufacturing, while the thinner outer peripheral portion reduces the drawing load, thus resolving the contradiction between moldability and drawing load
3Reliability
If the thickness of the hard sliding layer is increased, then the slidability is improved, but the torque required for opening the cap increases
Solution Approach 1:
The non-uniform thickness distribution maintains sufficient sliding surface area at the center for good slidability, while the reduced thickness at the periphery decreases the friction and load during opening, thereby reducing opening torque while preserving slidability
Data Source
AI summary
A cap includes a cap body including a disk-shaped top plate portion and a cylindrical skirt portion provided at a peripheral edge portion of the top plate portion; and a disk-shaped sealing member including a sliding layer and a sealing layer, the sliding layer disposed on the top plate portion side and having a thin portion thinner than at least a center side provided on an outer peripheral edge side, and the sealing layer provided on a main surface opposite to the top plate portion side of the sliding layer and sealing a mouth portion of a can container.