Reclosable Bag Closure with Outward-Curving Gripping Panels
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Solution Overview
Problem
Plastic bags with reclosable closures often lack features that facilitate easy opening, making it difficult for users to access the contents without additional grip-enhancing structures.
Innovation Solution
The design incorporates resilient closure members with self-retaining forms that curve outwardly when closed, forming gripping panels, and interlocking profiles to ensure a secure seal while allowing easy opening by creating a gap between the panels, enabling users to grasp and separate them.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If reclosable closures are added to plastic bags, then the bag can be selectively opened and closed, but the bag becomes difficult to open initially due to lack of gripping features
Solution Approach 1:
The closure members are segmented into distinct functional zones: interlocking profiles for sealing, curved middle portions for structural integrity, and straight top portions forming gripping panels for easy opening. This segmentation allows each zone to perform its specific function optimally.
Solution Approach 2:
The support walls transition from a curved configuration in the closed state to a more linear configuration when opened, utilizing dimensional change to provide gripping panels that extend outwardly, making the closure easy to grasp and open.
2Ease of operation
If additional grip-enhancing structures are added to facilitate opening, then ease of opening improves, but device complexity increases
Solution Approach 1:
The support walls serve multiple functions: they provide structural support, form the interlocking profiles for sealing, create the curved middle portions for flexibility, and form the straight top portions as gripping panels. This multi-functionality eliminates the need for separate grip-enhancing structures.
Solution Approach 2:
The gripping panels are merged with the closure members themselves, forming an integrated structure where the top portions of the support walls serve both as structural elements and as gripping surfaces, eliminating the need for additional separate gripping components.
3Reliability
If the closure members are made resilient with curved middle portions, then the closure can be securely sealed, but the manufacturing complexity increases
Solution Approach 1:
The middle portions of the support walls are formed with curved configurations that provide resilience and secure sealing. These curved profiles are integrated into the extrusion mold, allowing the complexity to be built into the tooling rather than requiring complex assembly processes.
Solution Approach 2:
The desired curved configuration and self-retaining form are built into the closure members during the extrusion process itself, rather than requiring post-manufacturing shaping or assembly steps. This preliminary formation of the complex geometry simplifies the overall manufacturing process.
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 configuration allows for effortless opening of the bag by providing distinct gripping panels that enhance user access without relying on additional grip structures, ensuring a secure closure and easy manipulation of the closure members.
Implementation Method 1
Each support wall is resilient and has a self-retaining form in vertical section. When the first and second closure members are mounted on the bag, the middle portions of the support walls curve outwardly away from one another
Data Source
AI summary
A closure for closing a bag and a die head and method for making the closure. The closure includes two closure members having support walls and mating interlocking profiles. The support walls are resilient and have self-retaining forms in vertical section including middle sections curving outwardly away from one another when mounted on a bag. Top portions of the support walls extend outwardly away from one another to form gripping panels when the closure is closed. A die head for forming a closure member includes a body that defines a slot including a support wall segment for forming the support wall of the closure member. The support wall segment includes first and second portions oriented transverse to one another and intersecting at a vertex. To form the closure member, polymer is extruded through the slot and quenched.