Tear-Resistant Packaging Bag with Tear-Stop Seams for Seal Retention
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Solution Overview
Problem
Existing packaging bags fail to reliably sever quality or sealing marks while preventing complete division, especially when used for products requiring legal seals like tax stamps or medical devices, which need to maintain the seal after opening.
Innovation Solution
A packaging bag design featuring a tear line that cuts through quality marks and includes a tear-stop arrangement to prevent complete separation, with a tear-stop leading edge positioned to halt tear propagation, and optionally using tear-stop holes or sealing seams to control the opening process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a predetermined tear line runs from one side edge to the opposite side edge to enable opening, then the bag can be torn open for product removal, but the bag splits into two loose parts that are no longer connected
Solution Approach 1:
The connecting seam is designed to extend beyond the tear line endpoints, preemptively establishing structural continuity that prevents bag separation before the tearing action completes. This preliminary structural preparation ensures that when the tear occurs, the bag remains as one piece.
Solution Approach 2:
The tear line is deliberately segmented or interrupted rather than forming a continuous path across the bag. This segmentation allows the tear to propagate for opening purposes while the gaps in the tear line, combined with the extended connecting seam, prevent complete separation of bag sections.
2Ease of operation
If the tear line extends completely across the bag to allow full opening, then product removal is facilitated, but quality or sealing marks may be completely severed and lost
Solution Approach 1:
The connecting seam is预先 extended beyond where the tear line would normally end, creating a protective bridge that will intercept and stop the tear propagation before it can reach and sever the quality or sealing marks. This preliminary structural arrangement ensures seal preservation.
Solution Approach 2:
The extended connecting seam acts as an intermediary element between the tear line and the quality/sealing marks. It absorbs and redirects the tear energy, preventing direct contact between the propagating tear and the critical sealing elements.
3Stability of the object's composition
If the tear line is stopped short of the opposite edge to prevent bag splitting, then bag integrity is maintained, but the opening process is incomplete and product removal is difficult
Solution Approach 1:
The connecting seam is extended beyond the intended tear endpoint, creating a pre-established structural support that allows the tear to stop naturally at this extended point. This preliminary reinforcement enables controlled, partial opening without requiring the tear to reach the bag edge.
Solution Approach 2:
The tear resistance is locally modified by the extended connecting seam at the specific location where tear propagation should stop. This localized structural enhancement creates a natural tear stop point that maintains bag integrity while achieving sufficient opening for product access.
Data Source
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AI summary
The invention relates to a packaging bag made of flexible plastic material, particularly for packaging medical products, having at least two bag walls (2) and having at least two side edges (3), wherein the bag walls (2) are connected to each other along the edge (4) thereof, at least in sections, by at least one connection seam (5), wherein a defined predetermined tear line (6), configured for controlled tearing of the packaging bag (1), is provided, which extends from a starting tear-open location (7) of a first side edge (3a) in the direction of a second side edge (3b). According to the invention, the bag walls (2) are connected on the second side edge (3b) by a connection seam (5), which has a front edge (9) directed toward the first side edge (3a), and a tear-stop arrangement (10) having a tear-stop front edge (11), configured to stop a tear propagation, is provided in the direction (V) of progression of the predetermined tear line (6), and the tear-stop front edge (11) is arranged in front of the front edge (9) of the connection seam (5) and the front edge (9) of the connection seam (5) is arranged in front of the second side edge (3h) in the direction (V) of progression of the predetermined tear line (6).