Self-Opening Bags With Attaching Features For Single-Handed Use
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Solution Overview
Problem
Thin film bags used for fresh produce and grocery items are difficult to open due to static cling, requiring two hands, and existing solutions either depend on specific dispenser systems or adhere subsequent bags together, failing to meet the objective of single-handed operation and compatibility with folded or gusseted bags.
Innovation Solution
The solution involves constructing self-opening bags with a Z-fold design and attaching features such as cold staking, hot pinning, corona treatment, knife cutting, or special resin formulations on the outer surfaces, which secure adjacent portions and allow the bag to open when pulled from a compact roll, enabling single-handed operation without adhering subsequent bags.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If adhesive bonding is used between inner panel and outer panel to stabilize the roll, then the roll is stabilized and single-handed operation is achieved, but the adhesive must be precisely positioned and controlled to allow bag opening while maintaining roll stability
Solution Approach 1:
The adhesive bonding is pre-applied between the inner panel and outer panel during bag manufacturing, creating a pre-stabilized structure that enables single-handed operation during use without requiring complex positioning systems at the point of use
Solution Approach 2:
The adhesive acts as an intermediary element that transfers and distributes the opening force from the outer panel to the inner panel, enabling controlled bag opening while maintaining roll stability during single-handed operation
2Ease of manufacture
If the bag material is made extremely thin to reduce cost and improve flexibility, then manufacturing cost is reduced and flexibility is improved, but static cling increases making the bag difficult to open
Solution Approach 1:
The static cling property of thin film material, which normally makes opening difficult, is converted into a beneficial force that assists in opening the bag when the adhesive bonding is activated, transforming the harmful static cling into a helpful opening mechanism
Solution Approach 2:
The physical state of the adhesive bonding is changed from a static attached state to a dynamic releasing state during bag opening, allowing the bag to transition from a closed stable configuration to an opened state through controlled adhesive failure
3Ease of operation
If adhesive bonding is applied to allow bag opening, then the bag opens easily, but the adhesive must be positioned only between specific panels and not on the outer surface to maintain the self-opening mechanism
Solution Approach 1:
The adhesive bonding is applied locally only between the inner panel and outer panel at specific locations, creating a localized bonding zone that enables opening while leaving the outer surface free for user interaction, thus achieving easy opening without requiring precision positioning on the outer surface
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
This design allows for easy, single-handed opening of thin film bags, regardless of the dispenser system, and works with both folded and gusseted bags, ensuring the bags remain compact and self-opening without requiring adherence between bags.
Implementation Method 1
the film used in construction of these bags is often corona treated to enhance ink adhesion
Implementation Method 2
the bag surfaces tend to stick together. This makes the bags difficult to open
Data Source
AI summary
A self-opening bag includes front and real walls joined at their respective first and second side and bottom edges. The bag is folded at least once parallel to its side edges. At least one attaching feature is located on the outer surface of the bag adjacent the upper end and between the folded walls. The bag is releasably attached to a subsequent bag. The at least one attaching feature causes the bag to open as the bag is pulled from the subsequent bag. The once folded bag may be sealed at the bottom edges after folding to form a star-sealed bag bottom. The bags may be removably attached to each other at a perforation line and wound onto a compact roll for use with a bag dispenser. The bags may have an upper seam, a U-shaped cut and a pair of bag handles. The bags may be corona treated.