Circumferential Rib Design for Hot-Fill Container Shape Stability
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Hot-fill polymer containers, particularly those made of lightweight polyester materials, face challenges in maintaining a uniform shape due to vacuum-related forces after cooling, as existing reinforcing features become inadequate with further material reduction for cost savings.
Innovation Solution
Incorporation of a circumferential rib with varying width regions that transition between smaller and larger dimensions, providing additional structural support adjacent to vacuum panels and land areas, ensuring the container's stability and uniform appearance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of stationary object
If material is removed to reduce container weight and cost, then manufacturing cost decreases, but the container becomes more vulnerable to unwanted changes-in-shape and collapse
Solution Approach 1:
The patent applies local quality by positioning circumferential ribs at specific locations where vacuum pressure causes the most deformation (between vacuum panels and at vulnerable areas). The ribs provide localized reinforcement exactly where needed, allowing the rest of the container wall to remain thin and lightweight. This resolves the contradiction by maintaining shape stability at critical points without increasing overall material usage.
Solution Approach 2:
The container wall is segmented into different functional zones: thin wall sections for cost reduction and thickened rib sections for structural support. The circumferential ribs create a segmented structure that distributes vacuum pressure across multiple reinforcement points, preventing collapse while minimizing total material usage. This segmentation allows lightweight construction with targeted strength where required.
2Stability of the object's composition
If traditional reinforcing grooves or ribs are added to control shape changes, then shape stability improves, but manufacturing complexity and material usage increase
Solution Approach 1:
The circumferential ribs serve multiple functions simultaneously: they provide structural reinforcement against vacuum pressure, maintain container shape during cooling, and can be integrated into the existing vacuum panel design. By merging these functions into a single structural feature, the patent avoids the complexity of multiple separate reinforcement elements while achieving comprehensive shape control.
Solution Approach 2:
The patent modifies the wall thickness parameter locally at rib locations rather than uniformly throughout the container. The ribs create controlled variations in wall thickness parameter, providing reinforcement where needed while maintaining thin walls elsewhere. This parameter change approach simplifies the overall structure compared to adding multiple complex reinforcement features.
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 circumferential rib configuration effectively enhances the container's resistance to unwanted shape changes and collapse, maintaining a pleasing uniform appearance while reducing material usage.
Implementation Method 1
As the liquid subsequently cools, the container is subjected to vacuum related forces
Data Source
AI summary
A polymer container suitable for hot-filling featuring at least one circumferential rib having a plurality of varying width regions transitioning from a smaller dimension area, to a larger dimension area, to the smaller dimension area. The larger dimension area is adjacent a land area between any two adjacent vacuum panels.