Fluted Paperboard Plate Rim Structure Against Buckling Failure
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing paperboard plates, especially those with arcuate surfaces, face issues of sudden failure due to buckling and pleat opening when made with very low board weights, leading to inadequate strength and durability, and conventional lightweight fluted plates are either too flexible or weak, making them unsuitable for carrying loads like beans.
Innovation Solution
A paperboard plate design featuring a flexible fluted sidewall with an outer down-turned arcuate portion, which distributes load and prevents extreme pleat opening, combining arcuate and fluted features to enhance strength and durability, and allowing for production on high-speed converting equipment with single-layer paperboard.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If arcuate surface of rotation designs are used to reduce board weight, then rigidity is improved in laboratory tests, but sudden failure through buckling occurs leading to pleat opening
Solution Approach 1:
The plate is divided into two distinct regions: an inner fluted region and an outer arcuate region. The fluted region provides flexibility and load distribution, while the outer arcuate region provides hoop strength and anchors the flutes, preventing extreme movements and sudden buckling failure.
Solution Approach 2:
Different regions of the plate are given different structural properties. The inner region has flutes for flexibility and load distribution, while the outer region has an arcuate shape for rigidity and buckling resistance. This local differentiation allows each region to perform its specific function optimally.
2Strength
If fluted plates are made from medium weight board, then good strength is achieved, but flexibility increases making it difficult to contain flowing loads like beans
Solution Approach 1:
The plate structure is segmented into fluted and outer regions, where the fluted interior sidewall provides flexibility for load adaptation while the outer arcuate region provides rigidity for load containment, resolving the contradiction between flexibility and load containment.
3Weight of moving object
If fluted plates are made from very lightweight board, then economy is improved by decreasing board weight, but the plates become both flexible and weak
Solution Approach 1:
The plate is segmented into fluted and outer arcuate regions, allowing very lightweight board to be used while maintaining strength through the synergistic combination of fluted flexibility and outer region rigidity.
Solution Approach 2:
Different regions have different structural qualities optimized for their functions: the fluted region handles flexibility and load distribution while the outer region provides strength and buckling resistance, enabling lightweight construction without sacrificing overall strength.
4Productivity
If arcuate designs are used to increase load capacity with decreasing board weights, then manufacturing economy is improved, but pleating control and press forming becomes far more difficult
Solution Approach 1:
The plate is segmented into fluted and outer arcuate regions, with the fluted interior sidewall allowing easier press forming and pleating control compared to fully arcuate designs, while the outer region maintains the arcuate shape for load capacity.
Data Source
AI summary
The present invention relates to rigid-buckling-resistant-fluted containers with an arcuate outer rim. The container such as a pressformed paperboard plate of overall diameter “D” including a generally planar bottom region, an upwardly extending fluted region surrounding the generally planar bottom region, and an outwardly and downwardly extending peripheral region having an arcuate radial profile. The containers being produced of a lightweight board but exhibiting high strength and rigidity relative to the low weight board.