Screw Cap Axial Separation Opening Indication
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Solution Overview
Problem
Existing screw caps for containers, particularly bottles, face issues with the security ring failing to extend radially, leading to incomplete opening indication, aesthetic concerns with visible tearing lines, and manual intervention required for complete detachment, which affects usability and visual appeal.
Innovation Solution
A screw cap design featuring a first capsule with an internal thread and a second capsule that rises axially upon unscrewing, utilizing spacing means such as protrusions and fins for irreversible locking, eliminating the need for a detachable safety ring and providing a clear opening indication without annoying movements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a detachable security ring is used on the screw cap, then the opening indication function is provided, but the safety ring fails to extend radially sufficiently and slides over the anti-extraction shoulder instead of blocking against it
Solution Approach 1:
The screw cap is divided into two separate capsules: a first capsule with internal threading and a second capsule with external threading. The second capsule is designed to rise axially away from the first capsule upon first unscrewing, providing the opening indication function without requiring a detachable security ring. This segmentation eliminates the radial extension limitation of traditional security rings.
Solution Approach 2:
The invention transitions from a radial security ring design to an axial separation design. Instead of extending radially to block against the anti-extraction shoulder, the second capsule rises axially away from the first capsule, utilizing the axial dimension to provide the opening indication function.
2Reliability
If a metallic safety ring is used, then the tearing function is improved, but the tearing line is visible and aesthetically depriving
Solution Approach 1:
The invention extracts the security ring entirely from the design and replaces it with the axial separation mechanism between the two capsules. This eliminates the visible tearing line associated with metallic safety rings while maintaining the opening indication function through the separation of the capsule components.
Solution Approach 2:
The second capsule is designed with specific local features including a covering portion and spacing means (protrusions and fins) that interact with corresponding features on the first capsule. This localized design provides the opening indication function without requiring a continuous metallic ring, thereby eliminating the visible tearing line.
3Adaptability or versatility
If a metallic capsule is used, then the cap is extensively decoratable, but manual intervention is required to complete the detachment of the security ring
Solution Approach 1:
The screw cap is segmented into two separately threaded capsules that automatically separate axially upon first unscrewing. This eliminates the need for manual intervention to detach a security ring, as the separation occurs automatically through the threading mechanism and spacing means between the two capsules.
Solution Approach 2:
The spacing means (protrusions and fins) between the two capsules automatically engage and disengage during the unscrewing process, providing the opening indication function without requiring additional manual manipulation. The system serves itself by using the threading action to automatically separate the capsules.
4Ease of manufacture
If the security ring is made integral with the capsule, then the manufacturing process is simplified, but the radial extension is limited by the necessity of extracting the piece from the mould without breaking it
Solution Approach 1:
The screw cap is divided into two separately manufacturable capsules with their own threading and security features. This segmentation allows each capsule to be molded independently with optimal dimensions, eliminating the radial extension limitation imposed on integral security rings by the mould extraction process.
Solution Approach 2:
The invention moves the security function from a radial extension problem to an axial separation solution. By using the axial dimension for the opening indication function through the separation of the two capsules, the design avoids the radial extension limitations of integral security rings.
Data Source
AI summary
A screw cap (10) for containers for liquids, comprising a first capsule (11), which is internally provided with a thread (12) and is to be screwed onto a corresponding complementary thread (13) of a neck of a bottle (14), and a second capsule (15), which surrounds said first capsule (11) and is designed to rise axially away from the first capsule (11) upon first unscrewing, by means of spacing means that act at the first rotation of the second capsule (15) with respect to the first capsule (11), means being provided for the irreversible locking of said second capsule (15) in the raised configuration relative to said first capsule (11).