Petaloid Base with Broken Valley for Pressure Resistance
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Solution Overview
Problem
Conventional container bottoms, such as petaloid and simple concave vaults, fail to provide sufficient mechanical resistance to internal stresses, especially when pressurized with inert gases, while requiring high material usage and blowing pressures, making them unsuitable for still liquids that require material and pressure minimization.
Innovation Solution
A plastic container with a low petaloid bottom design featuring a central dome and radially extending feet and valleys, where the internal and external portions of the valleys form obtuse angles and are inclined to distribute pressure effectively, enhancing mechanical rigidity without excessive material or pressure requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a conventional petaloid base is used to ensure mechanical resistance under pressure, then strength is improved, but weight increases and material usage increases
Solution Approach 1:
The base is segmented into multiple functional zones: a central dome, radial valleys extending from the dome, and feet projecting from the valleys. This segmentation allows each zone to bear specific loads, distributing stress more efficiently and reducing the need for excessive material throughout the entire base structure.
Solution Approach 2:
The base incorporates a central dome with curved surfaces and radially extending valleys with optimized curvature profiles. These curved geometries naturally distribute applied pressures more evenly across the base structure, enhancing mechanical resistance while using less material compared to flat or minimally curved designs.
2Strength
If a conventional petaloid base is used to ensure mechanical resistance under pressure, then strength is improved, but the amount of material used increases
Solution Approach 1:
Different regions of the base are designed with locally optimized properties: the central dome provides overall structural support, the radial valleys channel and distribute stresses, and the feet provide localized reinforcement at critical load-bearing points. This local optimization ensures material is placed only where structurally necessary.
Solution Approach 2:
The curved surfaces of the dome and valleys create efficient stress distribution paths that reduce material requirements. The geometry naturally redirects forces through the structure, allowing thinner walls and less material while maintaining strength.
3Strength
If a conventional petaloid base is used to ensure mechanical resistance under pressure, then strength is improved, but blowing pressure requirements increase
Solution Approach 1:
The segmented structure with radially arranged valleys and feet creates multiple independent load-bearing paths during the blowing process. This segmentation allows the preform to expand more uniformly and reduces the peak blowing pressure needed to achieve the desired base geometry.
Solution Approach 2:
The pre-formed dome and valley curvatures in the base are designed to guide the blowing process, allowing the molten plastic to flow into and conform to the mold cavities more easily. This reduces the blowing pressure required to create the final base shape while maintaining structural integrity.
4Weight of moving object
If a simple concave vault base is used to minimize material usage and blowing pressure, then weight decreases and material usage decreases, but mechanical resistance under pressure deteriorates
Solution Approach 1:
While maintaining a lightweight overall structure, the base is segmented into a central dome, radial valleys, and feet. This segmentation adds structural complexity only where needed to handle pressurized conditions, rather than requiring a completely different heavy-duty base design.
Solution Approach 2:
The incorporation of a central dome and curved valley profiles adds mechanical strength to the lightweight base structure. These curved geometries provide inherent structural reinforcement that enables the base to resist internal pressures from inert gases while keeping material usage low.
Data Source
Figure 1~2
Figure 3~4
Figure 5
AI summary
A container (1) provided with a petaloid base (3) having feet (8) that form protrusions towards the outside of the container (1), separated two by two by recessed valleys (10) that extend radially from a central dome (5) of the base (3) to a periphery (9) of same, each foot (8) having a median face (12) with concavity facing outwards and extending via an end face (13) forming a discontinuous seat ring (14), with a planar cross section, each valley (10) having an inner portion (15) extending from the central dome (5) and an outer portion (16) that meets the periphery (9), the inner portion (15) and the outer portion (16) being, in cross section in a central radial plane at the valley (10), straight and together forming an obtuse angle (P) protruding towards the outside of the container (1) and meeting at a vertex (17) situated in line with or very nearly in line with the seat ring (14).