Zipper Tape With Peelable Layer for Mono-Resin Recyclability
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Solution Overview
Problem
In zipper-tape-attached bags, when the cutting tape and zipper tape are formed with the same resin composition, it can be difficult for the cutting tape to peel off from the zipper tape, hindering the opening of the bag, as the resistance remains high.
Innovation Solution
A zipper tape design featuring a cutting strip with a peelable layer made of a resin composition having peelability with respect to the polyolefin resin, such as polypropylene, integrated with a polyolefin resin-based zipper tape body, allowing for easier separation without compromising the content ratio of single resin usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the cutting tape and zipper tape are formed with the same resin composition to increase single resin content ratio, then recyclability is enhanced, but the cutting tape cannot peel off from the zipper tape, increasing resistance on opening the bag
Solution Approach 1:
The cutting tape is segmented into two functional layers: a cutting tape base formed of polyolefin resin (same as zipper tape for recyclability) and a peelable layer formed of a different resin composition (having peelability with respect to polyolefin resin). This segmentation allows the cutting tape to maintain both high single resin content in the zipper tape body and peeling capability through the differentiated peelable layer.
Solution Approach 2:
Different parts of the cutting tape have different material properties: the cutting tape base uses polyolefin resin to match the zipper tape for mono-material production, while the peelable layer uses a resin composition with peelability characteristics. This local differentiation resolves the contradiction by providing peeling function only where needed (at the interface) while maintaining overall material consistency.
2Ease of operation
If a peelable layer is added to the cutting tape to enable peeling, then ease of opening is improved, but the device complexity increases due to multiple layers and resin compositions
Solution Approach 1:
The peeling function is extracted as a separate peelable layer that can be independently formed on the cutting tape base. This extraction allows the peeling capability to be added without fundamentally redesigning the entire zipper tape structure, maintaining relative simplicity while enabling the desired function.
Solution Approach 2:
The cutting tape is constructed as a composite of two resin compositions: polyolefin resin for the base and a peelable resin composition for the overlay. This composite structure provides both the structural integrity needed for the zipper tape and the peeling capability for easy opening, balancing complexity with functionality.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution enables increased content ratio of single resin in the zipper tape while maintaining low resistance during bag opening, enhancing recyclability and ease of use.
Implementation Method 1
a peelable layer layered on at least a part of at least an opposite surface of the cutting strip body from a surface of the cutting strip body bonded to the first surface, the peelable layer being formed of a resin composition having peelability with respect to the polyolefin resin
Data Source
AI summary
There is provided a zipper tape bonded to a bag body having a first surface and a second surface and including: a zipper tape body including a first base strip bonded to the first surface, a second base strip bonded to the first surface with a bonding portion, and engagement portions being mutually engageable and projecting from the first and second base strips, respectively; and a cutting strip provided in a region where the second base strip faces the first surface and does not face the first base strip. The zipper tape body is formed of a resin composition whose main component is a polyolefin resin. The cutting strip is formed of a resin composition whose main component is a polyolefin resin and includes a cutting strip body and a peelable layer layered on the cutting strip body and formed of a resin composition having peelability to a polyolefin resin.