Plastic Beverage Container Base With Dome Structure
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Solution Overview
Problem
Plastic containers for beverages face challenges in maintaining stability under internal pressures while minimizing material and energy input, particularly in the production of the base section which requires high finishing blowing pressures to ensure pressure stability.
Innovation Solution
A plastic container design featuring a base section with multiple standing foot areas, reinforcing ribs, and tension bands, along with a dome-like structure, which allows for reduced final blowing pressures below 20 bar and enhanced pressure stability, achieved through a multi-part blow mould process with specific curvature and weight distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high finished blowing pressure (over 30 bar) is used to form the foot radii of the bottle base, then the pressure stability and structural integrity of the container is improved, but the energy input and production costs increase
Solution Approach 1:
The preform is pre-shaped with an optimized base geometry including pre-formed foot radii and a dome-like structure before the final blowing process. This preliminary structuring allows the final blowing to occur at lower pressures (below 30 bar) while still achieving the required pressure stability, as the base structure is already partially formed and reinforced
Solution Approach 2:
The invention changes the geometric parameters of the base section, specifically the foot radii curvature and the dome-like structure height, to optimize the distribution of stresses during internal pressurization. By adjusting these parameters, the container achieves adequate pressure stability at reduced blowing pressures, lowering energy consumption
2Weight of moving object
If less material is used to produce the plastic container, then the weight and production costs are reduced, but the stability and pressure resistance of the container deteriorates
Solution Approach 1:
The container base section is designed with locally reinforced areas including the dome-like structure and foot radii regions where higher material density and structural complexity are concentrated. The rest of the container body uses less material, achieving overall weight reduction while maintaining stability through strategic local reinforcement where stresses are highest
Solution Approach 2:
The base section is segmented into distinct functional zones: the dome-like central structure, the foot radii areas, and the transition zones connecting to the container body. This segmentation allows each zone to be optimized independently for its specific function, using material only where necessary to achieve the required stability
3Strength
If a petaloid base (5 base or multi base) is used to withstand high internal pressure, then the pressure resistance is improved, but the manufacturing complexity and energy input increase
Solution Approach 1:
The base section incorporates a dome-like curved structure and optimized foot radii curvature that naturally distribute internal pressures more effectively. This use of curvature provides pressure resistance comparable to complex multi-base designs but with simpler geometry that is easier and less energy-intensive to manufacture
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 design achieves sufficient stability to withstand pressures up to 2.5 bar, reduces energy consumption in production, and maintains structural integrity during thermostability tests, while keeping the overall container weight low.
Implementation Method 1
a base section (102) which forms an at least partially circumferential standing surface (132), in particular a blow-moulded plastic container and in particular a stretch-blow-moulded plastic container for holding liquids and in particular beverages
Data Source
AI summary
Plastic container with a base section, with a main body adjoining the base section in a longitudinal direction of the container forming an inner volume of the plastic container wherein the base section forms a plurality of standing foot areas, wherein a tension band extending in a radial direction is disposed between two adjacent standing foot areas, and the base section has a first curved structure with an injection point such that that the injection point projects in the longitudinal direction of the plastic container towards a mouth of the plastic container and a second curved structure adjoins the first curved structure outwardly in the radial direction, wherein this second curved structure is curved in the direction of the mouth of the plastic container, wherein a radius of curvature of the first curved structure is smaller, at least in sections, than a radius of curvature of the second curved structure.