Foldable Container Base Locking Tab Cutline Design
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Solution Overview
Problem
Conventional interlocked base constructions for foldable containers made of cardboard or paperboard lack sufficient strength to securely hold heavy or fragile products, as the locking tab portion can easily move out of the slot, leading to base opening.
Innovation Solution
Incorporating cutlines on the fourth base flap that extend inwardly from the side edges at the transition between the base panel and locking tab portions, which inhibit the movement of the locking tab portion out of the slot by engaging with the edges of the second and third base flaps, enhancing the interlocking mechanism and base strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a conventional interlocked base construction is used, then the base can be closed without extrinsic components, but the base lacks sufficient strength to securely hold heavy or fragile products
Solution Approach 1:
The fourth base flap is divided into two functional portions: a base panel portion that forms the exterior of the base and a locking tab portion that extends through the slot to secure the base closed. This segmentation allows each portion to perform its specific function optimally while maintaining the overall simplicity of the interlocked base construction.
Solution Approach 2:
The locking tab portion acts as an intermediary element between the fourth base flap and the slot formed by the first, second, and third base flaps. By inserting the locking tab through the slot, it creates a mechanical interlock that prevents the base from opening, thereby strengthening the base without requiring extrinsic closure components.
2Ease of manufacture
If the locking tab portion is inserted through the slot to retain the base closed, then the base can be secured without adhesive or tape, but the locking tab can still move out of the slot under load
Solution Approach 1:
The cutlines are pre-formed in the fourth base flap at positions that will prevent the locking tab portion from moving out of the slot when load is applied. These cutlines create geometric constraints that counteract the potential harmful movement before it can occur, thereby improving reliability while maintaining the simple tapeless closure design.
3Reliability
If cutlines are added to the fourth base flap to prevent locking tab movement, then the base strength and reliability are improved, but the device complexity increases
Solution Approach 1:
The cutlines modify the geometric parameters of the fourth base flap by creating specific slit patterns that constrain the locking tab portion. These parameter changes in the flap's geometry provide the necessary retention mechanism without adding separate components, thereby improving reliability with minimal increase in device complexity.
Data Source
AI summary
Herein is provided a container including a plurality of sidewalls (3, 7, 9) connected to one another along foldlines, and a base. The base includes first, second, third and fourth base flaps (11, 13, 15, 17) connected along respective foldlines to respective sidewalls. The second and third base flaps (13, 15) are folded over the first base flap (11) and the fourth base flap (17) is folded over the second and third base flaps (13, 15). The fourth base flap (17) includes a base panel portion which forms part of the exterior of the base and a locking tab portion connected to a distal end of the base panel portion. The locking tab portion is inserted into the interior of the container through a slot defined by the first, second and third base flaps (11, 13, 15) to retain the base in a closed configuration. A cutline is provided extending inwardly from the side edge of the fourth base flap (17) on each side of the fourth base flap (17) at a transition between the base panel portion and the locking tab portion.