Reclosable Bag Cut Tape Unsealing Mechanism
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Solution Overview
Problem
Existing reclosable bags require significant force to unseal for the first time, making them difficult for elders and children to open, and can lead to improper unsealing, potentially cutting the content side during the process.
Innovation Solution
A reclosable bag design featuring a cut tape between the male and female fastener parts, with an easily unsealable structure such as a hole or weak line on the mounting base part adjacent to the cut tape, allowing unsealing without ripping the mounting base part, and a tab design that prevents cutting of the lower side film by positioning its intersection inside the side seal part.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the male fastener part and female fastener part are attached to one packaging material with circumferential portions bonded, then the bag can be reclosed and opened, but a great force is required to unseal for the first time
Solution Approach 1:
The packaging material is divided into two separate packaging materials that are bonded at circumferential portions. The male and female fastener parts are attached to different packaging materials, allowing the unsealing force to be applied only to the cut tape rather than the entire sealed structure, thereby reducing the force required for unsealing while maintaining the reclosable function.
Solution Approach 2:
The cut tape is extracted as a separate element between the male and female fastener parts. This cut tape is designed to be ripped easily to initiate unsealing, separating the unsealing function from the fastening function. The cut tape acts as a sacrificial element that breaks first, allowing the rest of the sealed structure to remain intact for reclosing.
2Ease of operation
If the male fastener part and female fastener part are simultaneously ripped when unsealing, then the bag can be opened, but it requires great force and may cut the content side
Solution Approach 1:
A tab is pre-formed at a specific position on the packaging material, extending from the side seal part toward the fastener parts. This tab serves as a predetermined unsealing initiation point that guides the user to apply force at the correct location. The tab's position and orientation are designed in advance to control the unsealing propagation direction, preventing it from reaching the content side and causing cutting.
Solution Approach 2:
The cut tape positioned between the male and female fastener parts acts as an intermediary element that absorbs the unsealing force. When the tab is pulled, the cut tape is ripped first, mediating the force transmission and preventing direct force application to the fastener parts and packaging material. This intermediary layer protects the content side from cutting while still allowing effective unsealing.
3Ease of operation
If the tab is positioned to extend from the side seal part, then unsealing can be initiated, but the mounting base part may be ripped requiring great force
Solution Approach 1:
The bonding between packaging materials is applied selectively at circumferential portions rather than across the entire surface. The cut tape is positioned specifically between the male and female fastener parts, creating a localized weak point for unsealing initiation. This localized approach allows the tab to effectively initiate unsealing without requiring the ripping of the entire mounting base part, as the bonding is already strategically placed to facilitate controlled separation.
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
Enables easy and simple unsealing with minimal force, preventing the mounting base part from being ripped and reducing the risk of cutting the lower side film, thus improving usability and reducing the required force for initial opening.
Implementation Method 1
overlapping packaging materials and thermally welding circumferential portions of the packaging materials to each other
Implementation Method 2
a male fastener part and a female fastener part that fit with each other
Data Source
AI summary
A bag 1 with a reclosable tape includes a reclosable tape 20 having a male fastener part 21 and a female fastener part 22 attached to one inner surface of a bag body 10, a cut tape 23 provided between mounting base parts 212 and 222 of those fastener parts, and an easily unsealable structure 50 formed on the mounting base part 212 adjacent to the cut tape 23 in an unsealing start part 30 of a side seal part 60 of the bag body. The easily unsealable structure 50 may be formed by: forming a hole portion 50a or a portion formed by a weak line on the mounting base part 212, arranging a thickness of the mounting base part 212 in the unsealing start part 30 so as to be thinner than other portions, or forming a non-adhesive part between the mounting base part 212 and the cut tape 23.