Zipper Tape with Tear Strip and Peeling Layer for Linear Film Cutting
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Solution Overview
Problem
Existing container designs with zipper tapes, such as retort pouches, often fail to prevent contents from adhering to the zipper during unsealing, especially when using nylon films, and may not allow for easy and linear cutting of the film upon unsealing.
Innovation Solution
A zipper tape with a tear strip and a peeling layer, where the peeling layer is formed by a second resin composition different from the first base, allowing for easy separation and linear cutting of the film during unsealing, and a bonded peeling portion with a peel strength less than or equal to 30 N/15 mm to prevent content adhesion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If an upper portion of a retort pouch is cut to form an opening above a zipper tape upon unsealing, then the container can be opened, but the film is not cut linearly resulting in unsealing failure
Solution Approach 1:
The patent applies preliminary action by pre-forming a V-shaped cut at the upper end of the container body before use. This pre-prepared cut structure guides the tearing process during unsealing, ensuring linear separation. The V-shaped cut includes a first cut portion and a second cut portion that meet at an acute angle, creating a predetermined failure path that directs the tear along a straight line when force is applied to the zipper tape.
2Adaptability or versatility
If a zipper tape is used in a container filled with contents, then the container can be sealed and resealed, but the contents adhere to the zipper prior to unsealing
Solution Approach 1:
The patent applies the extraction principle by removing the harmful adhesion effect through a specific structural design. The V-shaped cut is positioned and configured so that when the zipper tape is pulled during unsealing, the tear propagates along the predetermined V-shaped path, effectively separating the container body from the zipper tape before contents can adhere to the zipper. This extracts the adhesion problem from the system by ensuring separation occurs cleanly along the cut lines.
Solution Approach 2:
The V-shaped cut structure acts as an intermediary element between the container body and the zipper tape. This intermediate structural feature controls the separation process by providing a predetermined failure path that directs tearing away from the zipper engagement area, preventing direct contact between contents and the zipper tape during the unsealing process.
3Reliability
If nylon is used for a film of a container body, then the container has good sealing properties, but the film is not cut linearly upon unsealing
Solution Approach 1:
The patent applies preliminary action by pre-forming a V-shaped cut at the upper end of the nylon film container body. This pre-prepared cut structure overcomes the difficulty of cutting nylon film linearly during unsealing. The V-shaped cut includes a first cut portion and a second cut portion that meet at an acute angle, creating a predetermined failure path that directs the tear along a straight line when force is applied, regardless of the nylon material's resistance to clean cutting.
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 effectively prevents contents from adhering to the zipper during unsealing and allows for easy and linear cutting of the container film, ensuring reliable opening of the container.
Implementation Method 1
a resin composition forming the peeling portion is different from a resin composition forming a surface of the first base opposite to the first engagement portion
Implementation Method 2
pulling of the tear strip makes it possible to easily and linearly cut the film of the container body upon unsealing
Data Source
AI summary
Contents of a container are prevented from adhering to a zipper prior to unsealing, and a film of a container body is easily and linearly cut upon unsealing. Provided is a zipper tape including: a first base; a tear strip disposed in parallel with the first base at a first side in a width direction of the first base; a second base having a width larger than a width of an area including the first base and the tear strip; a first engagement portion and a second engagement portion that respectively protrude from the first base and the second base, and are engageable with each other; and a peeling portion provided on a surface of a part of the second base, the surface being located near the first base, the part extending beyond the first base at a second side opposite to the first side.