Sealing Disc Tear Strip Curvature and Cut Line Segmentation
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Solution Overview
Problem
Conventional sealing discs for packaging containers are prone to failure due to manufacturing imperfections and varying user techniques, leading to inconsistent and unreliable opening mechanisms.
Innovation Solution
A modified sealing disc design featuring a top and bottom member joined by a border seal, with a tear-away area delimited by a contour line and a tear strip containing a pull-tab, where the tear strip is defined by two cut lines that reduce abrupt force changes and promote smooth, controlled tearing, and the transition between the tear strip and contour sections is arranged at a curved corner portion to guide proper tearing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional tear strip design with single cut line is used, then the opening mechanism is simple, but the reliability of the opening mechanism deteriorates due to manufacturing imperfections and user variation
Solution Approach 1:
The contour line is segmented into multiple sections (first contour line section, second contour line section, third contour line section) with different curvature characteristics. This segmentation allows each section to perform a specific function in guiding the tearing process, improving reliability without requiring complex additional components
Solution Approach 2:
The contour line incorporates curved sections with specific radius of curvature (e.g., first radius R1 for the first contour line section, second radius R2 for the second contour line section) to guide the tearing process. The curved geometry helps distribute stress and guide the tear along the intended path, reducing sensitivity to manufacturing variations and user pulling angles
2Reliability
If the transition portion is positioned away from the curved corner portion, then the manufacturing alignment is easier, but the tearing guidance and reliability deteriorate
Solution Approach 1:
The transition portion is positioned at the curved corner portion where the contour line has a defined radius of curvature. This curved geometry naturally guides the tear propagation through the transition zone, ensuring accurate tear path following while the curvature provides manufacturing tolerance to alignment variations
3Reliability
If the first cut line and second cut line are positioned close together, then the tear strip width is reduced, but the structural strength and reliability deteriorate
Solution Approach 1:
The contour line has varying curvature characteristics at different locations: the first contour line section has a first radius of curvature R1, the second contour line section has a second radius of curvature R2, and the third contour line section has a third radius of curvature R3. This local variation in curvature allows the contour line to provide both structural support where needed and guiding functionality where required, maintaining tear strip integrity while ensuring reliable tear propagation
Data Source
Figure 1~2
Figure 3~4
Figure 5
AI summary
A sealing disc (1) for sealing an inner compartment in a packaging container, the sealing disc (1) is a laminate of a top member (2) and a bottom member (3), which are bonded to each other in selected areas (8, 18). The sealing disc (1) comprises a tear-away area (10) which is delimited by a contour line (11) arranged in the top member (2) and a tear strip (12) comprising a pull-tab (13) being arranged in the top member (2) and being part of the tear-away area (10). The top member (2) comprises a first cut line (19) and a second cut line (20). The first cut line (19) has a first end (21) and a second end (22) arranged on the contour line (11) and constitutes a first portion of the contour line (11). The second cut line (20) has a first end (23) and a second end (24), the first end (23) of the second cut line (20) being arranged on the contour line (11), and the second end (24) of the second cut line (20) being arranged within the tear-away area (10). The second cut line (20) comprises a tear strip section (20') and a contour section (20"), the tear strip section (20') delimits the pull-tab (13) and an inner edge (25) of the tear strip (12) and the contour section (20") constitutes a second portion of the contour line (11) and, at the same time, an outer edge (26) of the tear strip (12). The first end (21) of the first cut line (19) adjoins the second cut line (20) at a transition portion (30) between the tear strip section (20') and the contour section (20") of the second cut line (20) and is arranged at a distance (d1) from the transition portion (30) between the tear strip section (20') and the contour section (20") of the second cut line (20). A packaging container (100) comprising the sealing disc (1, 101) is also disclosed.