Non-circular Plastic Bottle Base with Recessed Injection Point
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Plastic containers with circular cross-sections used for carbonated beverages face challenges in material efficiency, pressure resistance, and tipping stability, while non-circular designs like square cross-sections offer advantages but can lead to unfavorable stress distributions and increased material requirements.
Innovation Solution
A plastic container with a base featuring a non-circular cross-section, including radially extending main ribs and a recess around the injection point, which increases stability and pressure resistance without significantly increasing wall thickness, and additional secondary ribs for further support.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If circular cross-section bottles are used for carbonated beverages, then pressure resistance is improved, but material consumption increases and tipping stability deteriorates
Solution Approach 1:
The base is segmented into multiple functional zones: a recessed central region housing the injection point, radially extending main ribs for structural support, and secondary ribs for additional reinforcement. This segmentation allows concentrated material placement where needed while minimizing overall material consumption.
Solution Approach 2:
The base exhibits local quality variations through different thickness zones and rib structures. Thicker material is strategically placed at the recess and rib locations to enhance pressure resistance, while thinner walls are used in non-critical areas to reduce material consumption.
2Loss of substance
If wall thickness is reduced to decrease material consumption, then material requirements are reduced, but pressure resistance and structural stability deteriorate
Solution Approach 1:
The base structure is divided into reinforced zones (recess, main ribs, secondary ribs) and reduced zones. This segmentation enables thin-walled construction in non-critical areas while maintaining adequate thickness and adding rib reinforcement in critical load-bearing areas to ensure pressure resistance.
Solution Approach 2:
The base combines thin-walled plastic material with integrated rib structures formed as a composite unit during injection molding. The ribs act as structural reinforcements embedded within the base material, creating a composite structure that achieves high strength-to-weight ratio.
3Stability of the object's composition
If non-circular cross-section (square/rectangular) is used to improve space utilization and stability, then tipping stability is improved, but unfavorable stress distributions occur and material requirements increase
Solution Approach 1:
The base features an asymmetric design with a central recessed region and radially extending ribs that are not uniformly distributed. This asymmetric structure optimizes stress distribution under internal pressure while maintaining the non-circular cross-section for improved tipping stability and space utilization.
Solution Approach 2:
The base incorporates a recessed central region with curved surfaces and radially extending ribs that follow curved paths. These curved elements help distribute stress more evenly compared to sharp corners, reducing unfavorable stress concentrations while maintaining the non-circular overall shape.
4Stability of the object's composition
If main ribs extend to injection point to increase stability, then structural stability is improved, but unfavorable stress distributions occur at injection point
Solution Approach 1:
The injection point is extracted and isolated within a separate recessed region, physically separated from the main rib structures. This extraction prevents the ribs from directly contacting the injection point, thereby avoiding stress concentrations at this critical location while maintaining overall structural stability through the rib framework.
Solution Approach 2:
The recessed region acts as an intermediary element between the injection point and the main ribs. It provides a transition zone that distributes loads away from the injection point, preventing unfavorable stress distributions while still allowing the ribs to provide structural support to the base.
Data Source
Figure 1~8
Figure 2~3
Figure 4~7
AI summary
The bottle has a base (2) that is provided with a cross-section different from a circular cross-section, where an injection point (4) is provided in a central region of the base. The base has radially extending two main ribs (6a, 6b) that linearly extend over the base such that a geometric connection line (L1) runs through the injection point. The injection point is arranged in a recess (12) of the base, where the recess extends in a direction of an interior of the bottle and separates both the main ribs from each other.