Peelable Bag Seal Pattern for Easy Opening Without Tearing
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Solution Overview
Problem
Existing bags with strong seal strengths can be difficult for users to peel open, leading to potential tearing and spillage of contents, especially for individuals with varying age or gender.
Innovation Solution
A bag making apparatus and method that applies a release agent in a pattern to prevent heat-sealing between panel parts, forming a peelable portion with controlled seal strength, using a combination of application, feeding, and heat-sealing devices to create bags with easy-open features.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If heat-sealing is applied to join panel parts, then seal strength is improved, but ease of peeling deteriorates
Solution Approach 1:
The sealed portion is segmented into multiple heat-sealed sections (first, second, and third heat-sealed sections) with different seal strengths. The first and second heat-sealed sections provide strong sealing, while the third heat-sealed section has reduced seal strength due to the release agent, creating a weak portion that facilitates easy peeling. This segmentation allows the bag to maintain overall seal integrity while providing a specific easy-open region.
Solution Approach 2:
A release agent is applied locally to a specific region of the first panel part to create a third heat-sealed section with reduced seal strength. This local application of the release agent creates a differentiated quality within the sealed portion, where most areas have strong adhesion but a specific local area has weakened adhesion to enable easy peeling initiation.
2Ease of operation
If release agent is applied to prevent heat-sealing, then ease of peeling is improved, but seal strength deteriorates
Solution Approach 1:
The release agent is applied partially rather than across the entire sealing surface. By limiting the release agent application to a specific region, the patent achieves partial prevention of heat-sealing, creating only a localized weak portion while maintaining strong sealing in other areas. This partial action balances peelability with overall seal strength.
Solution Approach 2:
The release agent is applied locally to create a specific weak portion within the sealed portion. This local quality differentiation ensures that only a small region has reduced seal strength for easy peeling initiation, while the majority of the sealed portion maintains strong adhesion for secure sealing.
3Reliability
If strong seal strength is used, then reliability of sealing is improved, but ease of opening deteriorates
Solution Approach 1:
The sealed portion is divided into multiple functional segments: strong heat-sealed sections for reliable sealing and a weak heat-sealed section for easy opening. This segmentation allows the bag to simultaneously achieve high sealing reliability in most areas while providing a dedicated easy-open function in a specific segment.
Solution Approach 2:
The release agent acts as an intermediary substance that modifies the heat-sealing process locally. By introducing this intermediary, the patent creates a controlled weak portion that serves as a mediator between the conflicting requirements of strong sealing and easy opening, allowing users to easily initiate peeling without compromising overall seal reliability.
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 bags to be easily opened by peeling, reducing the risk of tearing and spillage, and allowing for adjustable opening ease and direction through controlled application patterns of the release agent.
Implementation Method 1
a heat seal device configured to heat and pressurize the first and second superposed panel parts over the surface region so as to heat-seal the first and second superposed panel parts to each other
Data Source
AI summary
A bag includes a peelable portion and first and second panel parts facing each other. The bag is configured to be openable by peeling off the peelable portion. The peelable portion includes at least one joined region in which the first and second panel parts are joined to each other, and release agent application regions in which the first and second panel parts are prevented by a release agent intervening therebetween from being joined to each other, the release agent application regions being present in a pattern.