Zipper Tearing Guide Strip for Clean Unsealing
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Solution Overview
Problem
Conventional zipper-equipped bags face challenges in unsealing, including excessive material tearing, uneven sizes, contamination from cutting scum, and inefficient production processes, particularly when using interlocking-type zippers.
Innovation Solution
A zipper with an integrated tearing guide strip that can be separated from the base parts of the male and female members, allowing for easy unsealing by pulling the strip, reducing the required force, and guiding the tearing direction to prevent scum and material damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If an easily cuttable resin layer is used to enable easy unsealing, then unsealing ease is improved, but cutting scum is generated contaminating the content
Solution Approach 1:
The resin layer is segmented into multiple layers with different properties: a soft resin layer for easy tearing and a hard resin layer for structural support. This segmentation allows the soft layer to tear cleanly without generating scum while the hard layer maintains structural integrity during the tearing process.
Solution Approach 2:
The invention uses a composite resin layer structure combining soft and hard resin materials. The soft resin provides ease of tearing while the hard resin prevents scum generation. This composite approach resolves the contradiction between ease of unsealing and prevention of contamination.
2Ease of manufacture
If the easily cuttable resin layer is heated by the heat seat bar during sealing, then sealing is achieved, but the resin layer adheres to the base film requiring strict alignment
Solution Approach 1:
The resin layer has local quality differences: the soft resin portion is designed to be non-adhering to the base film, while the hard resin portion provides structural support. This local quality differentiation allows the resin layer to be sealed without adhering to the base film, eliminating the need for strict alignment.
3Ease of operation
If the bag raw material is torn excessively during unsealing, then unsealing is achieved, but the holding part becomes uneven making resealing difficult
Solution Approach 1:
The soft resin layer is designed in advance to tear at a predetermined location and direction. This preliminary design of the tearing path ensures that the bag raw material is torn evenly and controllably, creating uniform holding parts that facilitate easy resealing after unsealing.
4Adaptability or versatility
If separate components are used for the zipper and cut tape, then functional requirements are met, but production efficiency is reduced due to separate installation
Solution Approach 1:
The invention merges the zipper and cut tape into a single integrated structure. The soft resin layer is incorporated as part of the zipper assembly, allowing both sealing and unsealing functions to be achieved with one component. This integration eliminates the need for separate installation steps, significantly improving production efficiency.
Data Source
AI summary
A tearing guide strip 23 is integrated with a base part 21a or 21b of at least one of a male member 2a and a female member 2b constituting a zipper 2 in a peelable manner to improve the tearing unsealing ability of a zipper-equipped bag provided with an interlocking type zipper enabling resealing and unsealing after the bag is unsealed.