Tamper-Evident Blow-Moulded Vial Cap with Bidirectional Breaking Points
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Solution Overview
Problem
Existing container designs lack user-friendliness and effective tamper-evident mechanisms, making it difficult to ensure the originality of the opening/closing system and requiring complex procedures for opening and closing.
Innovation Solution
A container design featuring a two-part cap with axially running strips on the inside of a ring that interact with radially protruding blockade elements on the neck part, allowing the predetermined breaking point to be detached by rotational movements in both directions with approximately the same angle and torque, ensuring easy and secure opening while maintaining tamper-evident protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional single-part cap with piercing mandrel is used, then the opening function is simple, but tamper-evident protection is lacking and originality cannot be assured
Solution Approach 1:
The cap is divided into a first cap part and a second cap part, where the first cap part remains on the container after opening and the second cap part is removed. This segmentation allows the first cap part to serve as a permanent tamper-evident indicator while the second cap part facilitates the opening function, thus providing reliable tamper evidence without excessive complexity.
Solution Approach 2:
The second cap part is nested within the first cap part during storage and transport. The piercing mandrel is integrated into the second cap part. This nesting arrangement compactly houses multiple functions (tamper evidence, opening mechanism, piercing function) within a single cap assembly, improving reliability without proportionally increasing device complexity.
2Reliability
If a two-part cap with fixed layer and predetermined breaking points is used, then tamper-evident protection is provided, but the opening procedure becomes complex requiring rotation in specific directions
Solution Approach 1:
By separating the cap into two parts with different fates (first cap part stays, second cap part removes), the system provides clear tamper evidence through the remaining first cap part while simplifying the opening procedure - the user simply needs to unscrew the cap, and the predetermined breaking points will fail naturally during the unscrewing motion without requiring complex rotational maneuvers.
Solution Approach 2:
Instead of requiring the user to screw the cap in a specific direction to activate the breaking points, the design inverts the approach: the cap is designed to be unscrewed naturally, and the breaking points are positioned and oriented so that normal unscrewing motion automatically activates them. This reverses the complexity from user action to passive mechanism activation.
3Reliability
If the predetermined breaking points require rotation in one specific direction only, then tamper evidence is clear, but user-friendliness is reduced and unintentional actuation cannot be prevented
Solution Approach 1:
The breaking points are designed with asymmetric geometry relative to the cap's rotational direction, but the overall cap structure maintains symmetric unscrewing capability. This allows the breaking points to provide clear directional tamper evidence (asymmetric failure pattern) while the cap itself can be operated symmetrically by the user, maintaining user-friendliness and preventing unintentional actuation through natural hand motions.
Solution Approach 2:
The first cap part serves multiple functions: it remains as a tamper-evident indicator, provides a visual reference for proper opening, and can potentially be reused to close the container. The second cap part with integrated mandrel serves both as the opening tool and the element that triggers the breaking points. This multi-functionality improves user-friendliness without compromising tamper evidence clarity.
4Reliability
If complex opening procedures with multiple rotation directions are required, then tamper protection is enhanced, but the opening time and effort increase significantly
Solution Approach 1:
The breaking points are pre-positioned and pre-oriented on the first cap part such that the act of unscrewing the cap (a natural, quick motion) automatically activates them. No preliminary rotation in specific directions or complex maneuvers are needed - the tamper evidence mechanism is triggered as a byproduct of the normal opening action, thus maintaining high reliability while minimizing opening time.
Solution Approach 2:
The opening process itself serves to activate the tamper evidence mechanism. As the user unscrews the cap to open it, the relative motion between the first and second cap parts automatically triggers the breaking points. The system uses the opening action to serve dual purposes: both opening the container and activating tamper evidence, eliminating the need for separate actions and reducing time loss.
Data Source
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AI summary
A container, in particular a plastic vial produced in the blow-moulding method and filled and closed in the mould, comprising a neck part (5) joining a container body (1), onto which neck part a one-part or multi-part cap (2) can be placed, in particular slipped, a fixing part (29) being associated with the cap (2), which fixing part is connected to the cap (2) by means of at least one predetermined breaking point (31), which can be detached by a relative rotational motion between the cap (2) and the container body (1) or parts of the container body, is characterized in that each predetermined breaking point (31) can be detached by rotational motions that occur both in the one rotational direction and in the other rotational direction with approximately the same angle of rotation and approximately the same torque.