Recloseable Pouch Zipper Structure for Stronger Lock Engagement
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Solution Overview
Problem
Existing zipper closures for flexible pouches experience issues with internal separation under load, requiring larger sliders and increased environmental impact due to mass, and limited performance from uneven lock strength distribution.
Innovation Solution
A recloseable zipper closure design with a female profile and male profile that includes a female fin attached between the legs, a male fin positioned to concentrate force on the stronger lock, and a lock down feature to enhance rotational force, increasing lock interference and strength while maintaining a compact size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the zipper closure uses a conventional design with fins attached to profile legs, then the structure is simple, but the lock strength is insufficient and internal separation occurs under load
Solution Approach 1:
The patent relocates the fin attachment from the profile legs to the central base, utilizing the vertical dimension and central positioning to create a more effective force distribution system. This dimensional change allows the fin to act as a central anchor point that distributes loads to both profile legs symmetrically, preventing internal separation while maintaining structural simplicity.
Solution Approach 2:
The patent divides the force distribution function into two separate engagement paths: one through each profile leg. By attaching the fin to the central base rather than individual legs, the system segments the load path while maintaining a unified attachment structure, allowing each leg to contribute independently to lock strength without requiring a complex multi-component assembly.
2Strength
If the zipper closure increases slider mass to improve performance, then the lock strength increases, but the environmental impact and cost increase
Solution Approach 1:
The patent changes the structural parameters of the zipper closure by repositioning the fin attachment to the central base and modifying the profile leg geometry. This parameter change optimizes the mechanical leverage and force distribution, achieving enhanced lock strength through geometric optimization rather than increasing material quantity, thereby reducing environmental impact.
Solution Approach 2:
The patent applies local quality optimization by concentrating the attachment structure at the central base where it can most effectively distribute forces, rather than uniformly increasing the mass of the entire slider. This localized structural enhancement achieves the desired strength improvement with minimal additional material, reducing environmental footprint.
3Strength
If the zipper closure uses larger profile dimensions to improve lock strength, then the engagement strength increases, but the device size and cost increase
Solution Approach 1:
The patent optimizes the geometric parameters of the profile legs and central base attachment structure, achieving enhanced engagement strength through improved force distribution and leverage ratios rather than simply scaling up the overall dimensions. This parameter optimization maintains compact profile volume while maximizing mechanical efficiency.
Solution Approach 2:
By utilizing the central base as an attachment point, the patent creates a three-dimensional force distribution system that maximizes engagement strength without increasing the two-dimensional footprint of the profile. This spatial optimization allows for stronger locks within the same volume constraints.
Data Source
AI summary
A recloseable zipper closure for use with a flexible package has a female profile including first and second spaced profile legs joined by a female base to define a central, continuous, elongate receiver recess. A male profile opposing the female profile includes a male profile member extending from a male base, the male profile member being sized and positioned to be releasably inserted in the receiver recess and engaged with the first and second profile legs. A female fin is attached to the female profile at an attachment area along the base; the female fin being positioned to be secured to a portion of the flexible package. A male fin is attached to the male profile member and is positioned to be secured to another portion of the flexible package.