Sealed Package Opening Cut and Flap Design
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Solution Overview
Problem
Existing tear-open packages face challenges in efficiently opening without accidental opening, and manufacturing methods often compromise sealing properties or waste material, especially when using notches or seams.
Innovation Solution
A package design featuring a sheet material with a sealing flap and an opening cut arranged within a sealed portion, connected to the package face with a weaker bond than the longitudinal edges, and an incomplete weakening line to redirect the tearing motion, allowing controlled access while maintaining sealing integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a notch is arranged completely within the seam of the package to enable easier tearing, then the ease of opening is improved, but the manufacturing precision requirement increases and manufacturing cost increases
Solution Approach 1:
The opening cut is extracted from the seam location and repositioned to extend beyond the sealing flap edge, allowing the tear to initiate outside the seam where precision requirements are lower while still achieving controlled opening
Solution Approach 2:
The opening cut is segmented into two parts: one portion within the sealing flap and another portion extending beyond it, enabling the tear to propagate through both the sealing flap and the package body in a controlled sequence
2Ease of manufacture
If a seam is used instead of a notch to enable opening, then the manufacturing complexity is reduced, but space inside the package is lost or material is wasted
Solution Approach 1:
The opening cut extends partially beyond the sealing flap edge, providing just enough excess length to initiate tearing outside the seam without creating significant material waste or reducing package interior space
Solution Approach 2:
The opening cut is pre-formed during manufacturing to extend beyond the sealing flap, so that during opening the tear naturally propagates from this pre-positioned cut rather than requiring additional material or space
3Ease of operation
If the connection between the sealing flap and the first package face is made weaker to enable easy opening, then the ease of operation is improved, but the sealing reliability deteriorates
Solution Approach 1:
The connection strength is differentiated locally: the seal between the sealing flap and the package face is made weaker than the longitudinal seals, allowing the flap to be easily removed while the rest of the package maintains strong sealing
Solution Approach 2:
The sealing structure is segmented into different connection zones with different strength characteristics, enabling selective opening at the flap while preserving the integrity of the main package seals
Data Source
AI summary
The method including providing a sheet of material in the form of a strip, first folding the sheet of material onto itself to form a first package face and a second package face that oppose each other, a first end portion and a second end portion of the sheet of material extending from the first package face, sealing the sheet of material along opposed longitudinal edges of the sheet of material, fixing the first end portion and the second end portion to each other to form a sealing flap, first defining an opening cut in the sealing flap, the opening cut being defined by both the first end portion and the second end portion, and connecting the sealing flap to the first package face to form the assembled package, the opening cut not being visible or directly accessible on the assembled package.