Corrugated Container Stacking Tabs and Corner Posts
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Solution Overview
Problem
Conventional corrugated paperboard containers for agricultural produce face issues with stacking stability due to incomplete side-to-side securing of stacking tabs, leading to potential toppling, and require excess paperboard for multi-layer sidewalls to enhance stability, increasing costs and complexity in handling and storage.
Innovation Solution
A one-piece container design featuring inwardly inclined end walls, double thickness stacking tabs with vertical corrugations, and full-height reinforcing corner posts, along with tab locks in the bottom wall to securely engage and lock stacking tabs, ensuring stability without excess material usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If stacking tabs extend upward from sidewalls with notches cut into superjacent container, then stacking is enabled, but side-to-side movement is not fully prevented causing potential toppling
Solution Approach 1:
The patent moves the stacking tab engagement from the sidewall dimension to the bottom panel dimension. Instead of tabs engaging notches in sidewalls, tabs now engage locks formed in the bottom panel of the superjacent container, creating engagement in a different spatial dimension that provides more stable, four-sided securing.
Solution Approach 2:
The patent extracts the stacking tab engagement function from the sidewall structure and relocates it to the bottom panel. This separation allows the sidewalls to focus on containing contents while the bottom panel handles the stacking engagement function, improving overall stacking stability.
2Reliability
If multi-ply or multi-layer sidewalls are used to align stacking tabs with bottom panel, then stacking stability is improved, but excess paperboard is used increasing costs
Solution Approach 1:
The patent extracts the stacking engagement function from the sidewall structure and relocates it to the bottom panel, eliminating the need for multi-layer sidewalls. This allows single-layer sidewalls to be used, reducing paperboard consumption while maintaining stacking stability through the bottom panel lock mechanism.
Solution Approach 2:
By moving stacking engagement to the bottom panel dimension rather than relying on sidewall structure, the patent eliminates the need for excess paperboard in multi-layer sidewalls while achieving the same stability goal through a different spatial arrangement.
3Productivity
If containers are stacked with higher container falling into lower container on angle, then stacking density increases, but contents of lower container are potentially damaged
Solution Approach 1:
The patent applies preliminary anti-action by designing the bottom panel lock mechanism that actively prevents angular misalignment before damage can occur. The lock structure with its specific geometry and engagement requirements ensures that only properly aligned containers can be stacked, preemptively blocking the harmful angular stacking scenario.
Solution Approach 2:
The bottom panel lock acts as an intermediary mechanism between stacked containers, mediating the stacking process to ensure proper alignment. This intermediary structure prevents direct angular contact between containers that would cause damage, forcing alignment through the lock's geometric constraints.
4Adaptability or versatility
If three-piece Bliss style cartons are used, then container functionality is achieved, but extra warehousing and labor for set-up are required
Solution Approach 1:
The patent merges multiple separate components (bottom panel, sidewalls, stacking tabs, and locks) into a single unitary blank of corrugated paperboard. This integration eliminates the need for separate warehousing and assembly operations required by three-piece cartons, reducing complexity while maintaining full container functionality.
Solution Approach 2:
The unitary blank design provides multi-functionality, serving as both the structural container and the stacking mechanism in one integrated component. The bottom panel simultaneously provides container support and houses the locking mechanism, eliminating the need for separate assembly operations.
Data Source
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AI summary
A one-piece container formed from a single unitary blank of corrugated paperboard has a bottom wall, opposed side walls and inwardly inclined opposed end walls. Stacking tabs project upwardly from the end walls and tab locks in the bottom wall receive the stacking tabs of a subjacent container when the containers are stacked on top of one another. A reinforcing corner post extends the full height of the container in each corner. The corner posts are formed by panels extending from opposite ends of the end walls, wherein the panels include a first panel foldably joined to an end of an associated end wall and adhered to an adjacent side wall, a second panel foldably joined to the first panel and extending diagonally across the corner, and a third panel foldably joined to the second panel and adhered to an adjacent side wall.