Carton Arcuate Bottom Score Tension Flap Design
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Solution Overview
Problem
Conventional corrugated cartons experience top panel sagging and weakening with repeated use, leading to obstruction of the opening during loading and increased labor and costs for maintaining the opening with tape or mechanical means.
Innovation Solution
A carton design featuring arcuate wall panels and closure flaps with specific score lines that create tension, allowing the flaps to bow outward and remain erect, preventing obstruction and extending the carton's usable life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the top panels are folded after initial loading, then the opening is closed for reuse, but the panels sag into the interior and block the opening
Solution Approach 1:
The bottom score line is formed with arcuate (curved) sections instead of straight lines. This curvature creates a domed shape in the bottom panels that generates outward bowing force on the top panels, preventing them from sagging into the carton interior during repeated use.
Solution Approach 2:
The score lines are positioned and configured to change the structural parameters of the panels. Specifically, the arcuate bottom scores and vertically positioned side scores create tension zones that maintain panel rigidity and prevent deformation during repeated folding operations.
2Ease of operation
If tape or mechanical means are used to maintain top panels in open position, then the opening remains clear, but additional labor and cost are required
Solution Approach 1:
The carton structure itself provides the support needed to keep top panels in the correct position. The arcuate bottom scores and side wall scores create an self-supporting tension system that maintains panel orientation without requiring external tape, clips, or mechanical support devices.
Solution Approach 2:
The invention removes the need for external support mechanisms (tape, clips, mechanical devices) by integrating the support function directly into the carton's score line configuration. The structural support is extracted from being an separate component and becomes inherent to the carton design.
3Productivity
If the carton is reused numerous times, then productivity increases, but the top panels become weakened and sag further
Solution Approach 1:
The arcuate bottom score configuration pre-establishes a tension system that cushions against the weakening effects of repeated use. The curved geometry creates continuous outward pressure that counteracts the cumulative fatigue and sagging that would normally occur with repeated folding and unfolding operations.
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 maintains an open and accessible loading opening throughout its reuse cycles without the need for additional support, reducing labor and costs while preventing flap fatigue and obstruction.
Implementation Method 1
The vertical score lines define flex points for the wall panels and the closure flaps to bow slightly outward and impart tension on the wall panels and the closure flaps
Implementation Method 2
A typical carton has a set of top panels, a set of bottom panels, and a set of wall panels extending between the top panels and the bottom panels. When erecting the carton, the blank is folded along the score lines between the wall panels
Data Source
AI summary
A carton particularly well suited for storing packaged dry goods is designed such that the closure flaps that close a top opening of the carton do not obstruct the loading of goods into the carton through the top opening when the carton is placed on its side. The carton includes a front and rear panel that bow slightly outwardly so as to apply tension to the closure flaps connected to the front and rear panel. This tension prevents the flaps from falling into the opening during loading of the carton. This tension is created by vertical score lines in the front and rear panels as well as their associated closure flaps. In this regard, the mechanism to hold the closure flaps open is integrally formed with the carton.