Zipper Tape Wide Portion Gap Design
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Solution Overview
Problem
Existing zipper tape technologies face difficulties in allowing easy opening of package bags by children and elderly individuals, as they require simultaneous cutting of the tape, and issues with molten resin interference and base material cutting during the opening process.
Innovation Solution
A zipper tape design with a wide portion and projecting sections on either side of the open tape, creating a gap to prevent resin interference and allowing easy cutting of the bag body with the open tape, while maintaining the tape's integrity and appearance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If an open tape is disposed on a part of the zipper tape to enable film tearing, then the package bag can be opened, but the zipper tape or guide piece is cut together with the film making it difficult to operate
Solution Approach 1:
The zipper tape is divided into distinct functional zones: the open tape portion for cutting the film, and the zipper engagement portion with male and female members for sealing. This segmentation allows the open tape to be cut away during opening without affecting the integrity of the zipper mechanism, resolving the contradiction between ease of opening and zipper tape integrity
Solution Approach 2:
The open tape is extracted as a separate functional element that can be removed or cut away after serving its purpose of initiating the film tear. This extraction principle allows the open tape to fulfill its cutting function while preventing it from interfering with the zipper tape's sealing function, thereby maintaining zipper tape integrity during operation
2Reliability
If the thickness of both ends of the open tape is increased to prevent cutting, then the open tape cannot be cut at a predetermined position
Solution Approach 1:
The open tape has non-uniform thickness distribution: the central portion maintains standard thickness for easy cutting at the predetermined position, while the both ends have increased thickness to resist unintended cutting. This local quality variation allows the open tape to be cut precisely where needed while preventing accidental cutting elsewhere, resolving the contradiction between reliable cutting control and precise predetermined position cutting
Data Source
Figure 1
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AI summary
A belt-shaped base 331 of a female member 33 of a zipper tape 3 attached to an inner surface of a bag body 2 has a wide portion 34 that extends wider toward an opening of the bag body 2 than a belt-shaped base 321 of the male member 32. An open tape 4 is disposed on the wide portion 34 and a seal layer 5 is laminated on a surface of the open tape 4. A first projecting portion 35 is also provided on the wide portion 34. A second projecting portion 36 is provided on an opening-side end of the belt-shaped base 321. The projecting portions have a substantially trapezoidal cross section. When the zipper tape 3 is bonded to the bag body 2 and is sealed by the seal layer 5, a gap is provided between the open tape 4 and the first and the second projecting portions 35 and 36.