Bag Opening Tab With Surrounding Seal Area
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Solution Overview
Problem
Existing bags for packaging medicines and foods face challenges in maintaining sealability while allowing easy unsealing, as the methods for forming openings often compromise the bag's seal integrity.
Innovation Solution
A bag design featuring an elongated tearing guide piece bonded to the film, a belt-shaped base, and a surrounding seal area that intersects the tearing guide piece, allowing for easy opening while maintaining sealability through a tab that can be pinched and pulled to form an opening, with the surrounding seal area ensuring the containable space remains sealed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If holes are formed in the bag to create a pullout plug, then easy unsealing is achieved, but sealability of the bag deteriorates
Solution Approach 1:
A tab is formed by a cut portion penetrating through the front wall before use, allowing the pullout plug to be raised and pulled without compromising the sealed state during storage and transport. The tab is prepared in advance but only activates when manually pulled, maintaining sealability until opening is needed.
Solution Approach 2:
The cut portion is localized to a specific tab region rather than forming holes throughout the bag structure. This localized modification allows the pullout function while preserving the integrity and sealability of the rest of the bag, particularly the surrounding seal area that bonds the front and rear walls.
2Ease of operation
If the end portion of the pullout plug is exposed to allow pinching and pulling, then easy opening is achieved, but the method for raising the end portion is not provided
Solution Approach 1:
The tab structure is designed to be self-raising through the cut portion configuration. The tab naturally protrudes from the front wall due to the cut portion penetrating through it, allowing users to directly pinch and pull without requiring external tools or complex mechanisms to raise it.
3Reliability
If a surrounding seal area is added to maintain sealability, then sealability is improved, but the structure becomes more complex
Solution Approach 1:
The surrounding seal area is integrated with the existing bonding structure that bonds the front and rear walls. The seal area forms a continuous bonded region that both seals the containable space and provides structural support for the tab, combining multiple functions into a unified structure rather than adding separate components.
Data Source
AI summary
A bag includes: a film defining a containable space and a first area and a second area both facing the containable space; an elongated tearing guide piece directly or indirectly bonded to the first area; an elongated belt-shaped base disposed between the tearing guide piece and the second area and along the tearing guide piece; a tab defined by a cut portion penetrating through the first area of the film, the tearing guide piece and the belt-shaped base; and a surrounding seal area intersecting the tearing guide piece in a width direction, the surrounding seal area bonding the first area and the second area to define an area surrounding the tab.