Carton Window Flap Design for Containment Strength
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Solution Overview
Problem
Existing carton designs with windows compromise containment strength, leading to potential egress of articles, and require complex folding operations that hinder automation in packaging processes.
Innovation Solution
A carton design featuring window flaps hinged to the wall with curved fold lines, allowing them to deform and resist being folded into a position that exposes the contents, maintaining structural integrity while enabling easy formation through simple folding operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If a window is provided in the carton to allow viewing of contents, then consumer visibility is improved, but containment strength is weakened
Solution Approach 1:
The window is segmented into multiple separate flaps (first flap, second flap, third flap, fourth flap) rather than a single continuous opening. Each flap is independently hinged and can be positioned to overlap with adjacent flaps, creating multiple small gaps instead of one large window. This segmentation maintains structural integrity while still allowing consumer viewing of the contents.
2Strength
If complex folding operations are used to create the window, then containment strength is maintained, but manufacturing complexity increases
Solution Approach 1:
The window flaps are designed to be movable and flexible rather than fixed. The flaps can be folded along predetermined fold lines to create the window structure, and they remain capable of movement to allow for easy assembly and disassembly. This dynamic design simplifies manufacturing while maintaining structural integrity through the flexibility of the flaps.
3Loss of information
If window flaps extend into the interior volume, then viewing capability is improved, but article retention is weakened
Solution Approach 1:
Different regions of the carton have different structural properties tailored to their specific functions. The window flaps are positioned and dimensioned to provide optimal viewing capability in the window region, while the rest of the carton walls maintain their full structural strength for article retention. The flaps are designed with specific dimensions and hinge positions that allow viewing without compromising the overall containment structure.
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 carton provides a secure window for viewing contents without compromising containment strength, facilitating automated folding and assembly processes.
Implementation Method 1
the window flaps are hinged to the first wall by a curved fold line such that hinging the window flaps caused deformation of the first wall
Implementation Method 2
the deformation of the first wall resists the hinging of the window flaps into said second position
Data Source
AI summary
A package includes a carton (2) and articles (A). The carton includes primary walls (10, 12, 14, 16, 18) a first one (16) of which has at least one window flap (64) struck therefrom. The at least one window flap is connected at its hinged connection (68) to the first wall (16) for movement between a first position in which the at least one window flap is coplanar with the first wall and a second position in which the at least one window flap extends into the interior volume to define a window (66) in the first wall through which one of the articles is exposed to view. The at least one window flap (64) is allowed to move unimpeded by the one article when moving from the first position to the second position whereas it is in engagement at its free end edge at least in part with the one of the articles when in the second position.