Slider Retention for Zipper Seal Integrity
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Solution Overview
Problem
Closure mechanisms with sliders for occluding and de-occluding interlocking profiles face challenges in preventing leakage when fully closed, particularly due to the design limitations that allow separation only between upper pairs of profiles, leaving lower pairs unsealed.
Innovation Solution
A slider design featuring a channel with closure bars and a separator member that separates and engages upper and lower interlocking profiles, using retention members to prevent disengagement and ensure a secure seal, including a tail member and horizontal projection to maintain the slider's position on the closure mechanism.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the separator member extends only between the upper pair of opposing interlocking profiles, then the slider structure is simpler and easier to manufacture, but leakage occurs around the separator member when the slider is in the fully closed position because the lower pair of profiles is not separated
Solution Approach 1:
The separator member is divided into two distinct portions: a first portion extending between the upper pair of interlocking profiles and a second portion extending between the lower pair of interlocking profiles. This segmentation allows each portion to independently perform its sealing function, preventing leakage at both the upper and lower interfaces while maintaining structural integrity
Solution Approach 2:
The separator member transitions from a single-dimension design (extending only between upper profiles) to a two-dimensionally extended design that spans both upper and lower profile pairs. This dimensional extension ensures comprehensive sealing coverage across the entire closure mechanism interface
2Reliability
If the slider separates both upper and lower interlocking profiles, then leakage is prevented, but the device complexity increases due to additional structural components
Solution Approach 1:
The separator member merges multiple functions into a single integrated component: it separates both upper and lower interlocking profiles, provides continuous sealing along the entire closure interface, and maintains structural connectivity. This consolidation eliminates the need for multiple separate separator components, reducing overall device complexity while achieving comprehensive sealing
3Reliability
If the closure bars are positioned to occlude both upper and lower profiles, then complete sealing is achieved, but the slider width and channel dimensions increase
Solution Approach 1:
The closure bars are positioned with specific local precision to engage only the necessary portions of the interlocking profiles. The first closure bar occludes the upper pair of profiles while the second closure bar occludes the lower pair, with each bar's dimensions and positioning optimized for its specific function, minimizing overall slider width while ensuring complete sealing
Data Source
AI summary
A pouch includes an elongate closure mechanism having upper and lower pairs of opposing interlocking profiles and a slider for opening and closing the closure mechanism. The slider includes upper closure bars vertically and longitudinally spaced from lower closure bars for occluding the upper and lower opposing interlocking profiles, respectively, and a separator member for separating only the upper opposing interlocking profiles. The lower closure bars are disposed at the opening end, and the upper closure bars are disposed at a closing end of the slider opposite the opening end. A longitudinal retention member extends longitudinally from the separator finger toward the closing end below the upper closure bars, and a lateral retention member extends laterally outwardly from the separator member above the lower closure bars. The longitudinal retention member and the lateral retention member each engages an underside of the upper pair of interlocking profiles to help retain the slider on the closure mechanism.