Petaloid Container Bottom Grooves for Pressure Resistance
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Solution Overview
Problem
Existing container bottoms, particularly those for non-carbonated beverages, face challenges in balancing material efficiency, blow molding pressure, and mechanical stress resistance, especially when subjected to inert gas pressures, as they either require excessive material and high molding pressures or fail to support increased stresses effectively.
Innovation Solution
A 'mini-petaloid-shaped' bottom design with reduced foot height, radial extension grooves, and a central dome provides enhanced mechanical strength while minimizing material usage and blow molding pressure, suitable for applications with inert gas pressures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a standard petaloid-shaped bottom with large feet is used, then the container can support high internal pressures from carbonated beverages, but the amount of material required increases significantly (greater than or equal to about 18 g for a 0.5 l container) and the blow molding pressure must be increased (22 to 30 bars)
Solution Approach 1:
The patent changes the geometric parameters of the bottom structure by introducing grooves that modify the stress distribution pattern. The grooves create localized reinforcement zones that alter how forces are transmitted through the bottom, allowing reduced material quantity while maintaining pressure resistance capability
Solution Approach 2:
The bottom is segmented into distinct functional zones by the grooves, which divide the continuous bottom surface into compartments. This segmentation creates stress pathways that redirect forces through specific structural elements, improving pressure distribution efficiency and reducing overall material requirements
2Strength
If a standard petaloid-shaped bottom with large feet is used, then the container can support high internal pressures from carbonated beverages, but the blow molding pressure must be increased to 22 to 30 bars
Solution Approach 1:
The grooves are pre-formed into the bottom structure during molding, creating built-in stress management features before the container is put into service. This preliminary structural preparation allows the bottom to naturally distribute pressures without requiring excessive blow molding pressure to achieve the desired strength
3Quantity of substance
If a simple concave arch bottom is used, then material usage is minimized and blow molding is simplified, but the bottom cannot support the doubled hydrostatic pressure from added neutral gas without significant deformation
Solution Approach 1:
The patent introduces grooves as a geometric parameter change that transforms the simple concave arch into a structurally enhanced bottom. These grooves modify the stress distribution and create localized reinforcement without significantly increasing material quantity, enabling the bottom to support doubled hydrostatic pressure from neutral gas addition
4Quantity of substance
If the feet height is reduced to minimize material usage, then material amount and blow molding pressure are decreased, but the mechanical strength and stability under inert gas pressure are compromised
Solution Approach 1:
The grooves act as structural parameters that compensate for reduced foot height. By modifying the stress distribution through the groove geometry, the bottom maintains mechanical strength and stability under inert gas pressure even with shorter feet, thus resolving the contradiction between material minimization and strength preservation
Data Source
AI summary
A container (1) includes a body and a petaloid base (3) extending the body, the base (3) including feet (7) separated into pairs by recessed valleys (12) that extend radially to an edge (8), the base (3) further including a series of grooves (17) that extend radially, extending at least partially along the bottom of the valleys (13), in which:the feet (7) extend axially to a height less than or equal to 1/5 of a radial extension of the bottom (3);the bottom (3) includes a central dome (5), whose concave part is turned towards the outside of the container (1);each groove (17) has an inner section (17A) that projects radially from the valley (12) and overlaps the dome (5), and an outer section (17B) that extends radially in the continuity of the inner section (17A), at the bottom of the respective valley (12).