Packaging Bag Protrusion Prevents Adhesive Contact
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Solution Overview
Problem
Conventional packaging bags fail to prevent adhesive from plasters from adhering to the inner surface, making it difficult to remove the plaster due to the adhesive sticking out from the outer periphery.
Innovation Solution
A packaging bag design featuring a pair of packaging films with a protrusion that contacts only the plaster body, excluding the outer periphery, and having a suitable height to prevent adhesive contact with the bag, along with laminated films for strength and air-tightness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a flat packaging bag is used to seal the plaster, then the packaging is simple and common, but the adhesive sticks out from the outer periphery and attaches to the inner surface of the packaging bag, making removal difficult
Solution Approach 1:
The packaging bag incorporates projections at specific locations (corresponding to the outer periphery of the plaster) that create localized air gaps. These projections are strategically positioned to prevent adhesive contact only where needed, while maintaining close contact elsewhere for effective sealing. This local modification resolves the contradiction by making the packaging bag slightly more complex only where necessary to prevent adhesion.
2Ease of operation
If small projections are formed over the whole of the inner surface of the packaging bag to reduce contact area, then the contact area with the plaster is reduced, but the adhesive still contacts the projections and adhesion occurs
Solution Approach 1:
Instead of distributing projections uniformly across the entire inner surface, the invention places projections only at specific locations corresponding to the outer periphery of the plaster. This localized approach ensures that adhesive contact is prevented exactly where it would occur, while avoiding unnecessary projections that would reduce sealing effectiveness.
Solution Approach 2:
The projections extend in the thickness direction of the packaging bag, creating a three-dimensional structure that generates an air gap between the adhesive and the inner surface. This dimensional approach prevents adhesion by physically separating the adhesive from the packaging bag surface at critical locations.
3Reliability
If the protrusion height is increased to separate the packaging films further, then the adhesive contact prevention is improved, but the gap between packaging films increases which may affect sealing
Solution Approach 1:
The projections are positioned to create optimal air gaps at the outer periphery of the plaster without excessively increasing the overall gap between packaging films. The height and positioning are carefully controlled to prevent adhesive contact while maintaining adequate contact area for effective sealing elsewhere.
Solution Approach 2:
The projections provide just enough separation to prevent adhesive contact, without creating excessive gaps that would compromise sealing. The design uses the minimum necessary protrusion height to achieve the adhesion prevention function while maintaining sealing integrity.
Data Source
AI summary
A packaging bag 1 according to the present invention comprises a pair of packaging films 7x, 7y that are disposed facing one another, and are sealed together around a perimeter thereof so as to form a housing portion 9 housing a plaster. On one of the packaging films 7x is provided a protrusion 10 that protrudes toward the other packaging film 7y. When the plaster 2 is packaged, only the protrusion 10 of the packaging film 7x contacts a plaster body 5. The portion contacted by the protrusion 10 is a portion, on the inside of the plaster body 5, that excludes an outer periphery of the plaster body 5. Therefore, even if adhesive sticks out of the outer periphery of the plaster body 5, this adhesive does not contact the packaging film 7x. As a result, the plaster 2 can be easily removed from the packaging bag 1.