Easily Tearable Zipper Tape With Thin Portion And Ribs
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Solution Overview
Problem
Existing zipper tapes for packaging bags face difficulties in being easily cut at a predetermined position, especially when made from less rigid materials, as they may stretch or fail to exhibit cuttability due to flexion during manufacturing.
Innovation Solution
An easily tearable zipper tape design featuring a thin portion with ribs on its surface, which is thinner and less rigid than the projecting portions, allowing for easy cutting and improved tearability without bending issues, and is not bonded to the bag's inner surface to enhance rigidity and prevent cutting errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a cutting portion is formed of a less rigid material (e.g., LL material), then the zipper tape can be more easily cut, but the cutting portion may be stretched, whereby tearing resistance may be increased
Solution Approach 1:
The zipper tape base is designed with non-uniform thickness, creating a thin portion that is thinner than other portions. This local variation in thickness allows the thin portion to be more easily cut while the thicker portions maintain structural integrity and resist stretching, thus resolving the contradiction between ease of cutting and tearing resistance.
2Ease of operation
If a zipper tape made of less rigid LL material is used, then the zipper tape can be more easily cut, but flexion strength of the thin portion is remarkably weak, causing the thin portion to be bent in manufacturing
Solution Approach 1:
The thin portion is designed with a specific thickness that is thinner than other portions to facilitate cutting, while the overall zipper tape base maintains sufficient thickness in other areas to provide the necessary flexion strength during manufacturing, preventing bending while enabling easy cutting.
Solution Approach 2:
The thin portion is pre-formed with a specific geometric configuration during manufacturing, creating a predetermined cutting path that guides the cutting process and ensures consistent cuttability while maintaining structural stability during the manufacturing process.
3Ease of operation
If the thin portion is made thinner to improve cuttability, then the zipper tape can be more easily cut, but the thin portion becomes weaker and may bend during manufacturing
Solution Approach 1:
The zipper tape base is designed with non-uniform thickness, creating a thin portion that is thinner than other portions. This local variation in thickness allows the thin portion to be more easily cut while the thicker portions maintain structural integrity and resist bending during manufacturing.
Data Source
AI summary
A thin portion is provided near an opening of a bag body to a main body of a belt-like base connected to an engagement portion. The thin portion is provided between a thick first projecting portion and a thick second projecting portion. The thin portion is thinner than the first projecting portion and the second projecting portion. On the thin portion, ribs are provided in plural lines.