Easy-Peel Pouch Seal Geometry for Spill-Controlled Opening
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Solution Overview
Problem
Existing pouch designs require cutting or tearing to access contents, which can lead to unintended spillage during opening, and hand-peelable seals fail to maintain integrity during retorting processes.
Innovation Solution
A flexible package design featuring a first and second wall with permanent and easy-peel seals, where the easy-peel seal has a lower peel force and increases in resistance at intersections, allowing controlled opening without tearing the walls.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the pouch is cut or torn open to create a break in the walls, then direct access to contents is achieved, but the contents may unintentionally escape during opening
Solution Approach 1:
The seal is divided into two distinct segments: a permanent seal portion that maintains package integrity and an easy-peel seal portion that allows controlled opening. This segmentation enables the package to be opened without tearing the walls, thus preventing content spillage while maintaining ease of access.
Solution Approach 2:
Different portions of the seal have different properties: the permanent seal portion has high bond strength to prevent opening, while the easy-peel seal portion has lower bond strength for easy separation. This local differentiation of seal properties allows controlled opening at the easy-peel portion without affecting the permanent seal portions, preventing content escape.
2Ease of operation
If a hand-peelable seal is designed for easy opening, then ease of operation is improved, but the seal cannot withstand retorting processes
Solution Approach 1:
The seal is segmented into permanent and easy-peel portions with distinct peel forces. The permanent seal portion is designed with sufficient bond strength to withstand retorting temperatures and pressures, while the easy-peel portion is designed with lower bond strength for consumer opening. This segmentation resolves the contradiction by assigning different functional requirements to different segments of the same seal structure.
Solution Approach 2:
The seal exhibits local quality differentiation where the permanent seal portion maintains high bonding strength for retort resistance, while the easy-peel seal portion has reduced bonding strength for easy opening. This localized property variation allows the seal to simultaneously satisfy both retort integrity and ease of opening requirements in different regions.
3Ease of operation
If the easy-peel seal extends between permanent seals forming intersections, then controlled opening is enabled, but the peel force varies during opening
Solution Approach 1:
The intersection of the easy-peel seal with the permanent seal provides tactile feedback to the consumer during opening. As the consumer peels the easy-peel portion, they encounter increased resistance at the intersection point, which signals that the easy-peel portion is fully opened and further force should be applied to separate the permanent seal portions. This feedback mechanism enables controlled opening despite variable peel force.
Data Source
AI summary
Embodiments described herein provide for a flexible package including one or more permanent seals and an easy-peel seal. The easy-peel seal an elongated shape that defines a convex portion which projects away from the enclosed space. When opening the package by pulling apart the opposing walls thereof as by grasping and pulling a plurality of flaps, the effective peeling force increases at least 5 N as the package is opened.