Reclosable Slider with Composite Ends for High-Pressure Bags
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Solution Overview
Problem
Conventional reclosable plastic bags with sliders fail under high-pressure environments due to the slider preventing the film from laying flat, causing air pockets and film stretching, which leads to failure during pressurized treatments.
Innovation Solution
A slider for reclosable plastic bags is designed with a core portion made of a rigid material and end portions made of a softer material, allowing the slider to engage and disengage track portions while withstanding pressure, using a multi-stage molding process to achieve tailored material properties, ensuring the slider remains on the track without causing damage to the bag.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a conventional slider is used in reclosable bags, then the slider can engage and disengage track portions for easy opening and closing, but the slider prevents the film from laying flat under high pressure, causing air pockets and film stretching that lead to failure during pressurized treatments
Solution Approach 1:
The slider is designed with different material properties in different regions: the body portion is made of a relatively hard material to maintain structural integrity and engagement with the track, while the end portions are made of a relatively soft material to conform to the film surface under pressure and prevent air pockets. This local differentiation of material properties resolves the contradiction between operational ease and high-pressure reliability.
2Strength
If the slider body is made of rigid material, then the slider can withstand pressure and maintain structural integrity, but the rigid slider prevents the film from laying flat and causes film stretching and failure
Solution Approach 1:
The slider employs a composite structure where the body is made of rigid material for strength and the end portions are made of soft material that can conform to the film. This local quality differentiation allows the slider to simultaneously withstand pressure while preventing film damage.
Solution Approach 2:
The slider is constructed as a composite object combining rigid and soft materials in specific regions. The rigid body provides structural integrity while the soft end portions prevent harmful effects on the film, resolving the contradiction between strength and prevention of film failure.
3Reliability
If the slider end portions are made of soft material, then the slider can conform to the film and prevent air pockets under pressure, but the soft material may not provide sufficient structural support to maintain engagement with the track
Solution Approach 1:
The slider design assigns different material properties to different regions: soft material at the ends for conforming to the film and preventing air pockets, and rigid material in the body for maintaining structural support and track engagement. This spatial differentiation resolves the contradiction between reliability and structural strength.
Data Source
AI summary
A fastener for a plastic bag includes first and second mutually engageable track portions and a slider for engaging and disengaging the track portions. In a preferred embodiment, the slider includes a core portion and an end portion. The core portion is made of a first material having a first preselected material property. The end portion is made of a second material having a second preselected material property and is arranged at opposing ends of the slider.