Re-sealable Flexible Package Reinforced Perimeter
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Solution Overview
Problem
Conventional flexible packages with lidding members experience leakage issues due to channel formation at the adhesive interface between the base member and the lidding member, especially in refrigerated environments, which compromises the containment of liquids and overall package integrity.
Innovation Solution
A flexible package design featuring a reinforced perimeter portion on the lidding member that blocks channels from extending to the edge of the base member, utilizing a frangible layer and pressure-sensitive adhesive to prevent liquid leakage, along with a cut line and ink layer for enhanced separation and resealing capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a lidding member with adhesive interface is used to attach to the base member, then the package can be sealed and maintained, but channels form at the adhesive interface causing liquid leakage
Solution Approach 1:
A frangible layer is pre-formed within the lidding member at a predetermined location before the package is sealed. This frangible layer acts as a preliminary barrier that will fracture to create a leak-prevention path if channel formation occurs during storage or handling, preventing liquid from reaching the adhesive interface and base member exterior.
Solution Approach 2:
The frangible layer serves as an intermediary element between the liquid contents and the adhesive interface. When fractured, it creates a controlled path that blocks liquid from migrating through channels to the adhesive interface, thereby protecting the seal integrity without interfering with the initial sealing function.
2Ease of operation
If the lidding member is made peelable for access, then ease of opening is improved, but resealing capability may be compromised
Solution Approach 1:
The frangible layer is pre-positioned within the lidding member structure before use. When the package is opened and the lidding member is peeled back, the frangible layer fractures along its predetermined path, creating a permanent barrier that remains in place to prevent leakage during subsequent resealing operations, thus maintaining both ease of opening and resealing reliability.
Solution Approach 2:
The lidding member is segmented into functional layers including the frangible layer positioned at a specific location. This segmentation allows the frangible layer to independently perform its leak-prevention function while the rest of the lidding member maintains its peelable and resealable characteristics, resolving the contradiction between ease of operation and reliability.
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
The reinforced perimeter effectively prevents liquids from escaping, maintaining package integrity and ensuring that liquids remain contained within, while allowing for easy access and resealing of the package.
Implementation Method 1
the frangible layer is disposed in at least the perimeter portion and is configured to fracture, thereby separating the first layer and the second layer at the frangible layer when at least a portion of the lidding member is peeled away from the base member
Implementation Method 2
the adhesive layer comprises a pressure sensitive adhesive in a first portion spaced inwardly from the exterior edge of the flange
Data Source
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AI summary
A flexible package comprises: a base member defining a cavity configured to receive an item therein, the base member comprising a flange, wherein the flange defines and exterior edge; and a lidding member configured to be attached to the base member to cover the cavity and maintain the item within the base member, wherein the lidding member is configured to be peeled away from the base member to provide access to the cavity and is configured to be resealed to the base member, wherein the lidding member comprises: a first layer configured to engage the flange of the base member and extending at least to the exterior edge of the flange, a second layer laminated to the first layer via an adhesive layer, wherein the adhesive layer comprises a pressure sensitive adhesive in a first portion spaced inwardly from the exterior edge of the flange, a permanent adhesive in a perimeter portion adjacent an outer edge of the pressure sensitive adhesive, and a frangible layer between the first layer and the adhesive layer in at least the perimeter portion, wherein the frangible layer is configured to fracture thereby to separate the first layer and the second layer at the frangible layer when at least a portion of the lidding member is peeled away from the base member, and wherein the pressure sensitive adhesive is configured to separate from the at least the first layer when at least a portion of the lidding member is peeled away from the base member.