Plastic Bottle Bottom Hexagonal Depression Pressure Resistance
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Solution Overview
Problem
Existing plastic bottles are not adequately designed to withstand significant pressure changes, such as those caused by filling with beverages, leading to deformation and reduced production efficiency.
Innovation Solution
A plastic bottle design featuring a bottom portion with concave hexagonal depressions that allow for symmetrical deformation under both axial and perpendicular loads, with strategically arranged depression rows and vertex angles to enhance pressure change absorption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional bottom portion designs are used, then the bottle can withstand small pressure changes from temperature variation, but the bottle deforms under larger pressure changes during mechanical filling
Solution Approach 1:
The bottom portion is segmented into multiple functional zones: a central dome portion, an intermediate portion with first depression rows, and an outer peripheral portion with second depression rows. This segmentation allows different regions to handle different aspects of pressure distribution, enabling the bottle to withstand high filling pressures without deformation while maintaining efficient filling processes.
Solution Approach 2:
Different regions of the bottom portion are given different structural qualities: the central dome provides initial pressure resistance, the intermediate portion with first depression rows absorbs radial expansion, and the outer peripheral portion with second depression rows handles circumferential stress. This local differentiation of structural properties enables the bottom portion to effectively withstand large pressure changes during mechanical filling.
2Strength
If the bottom portion is strengthened to withstand large pressure changes, then deformation is prevented, but the liquid pressure applied during filling must be limited
Solution Approach 1:
The bottom portion is divided into multiple depression rows with different orientations: first depression rows extend radially from the center to absorb radial expansion, while second depression rows extend circumferentially to handle hoop stress. This segmentation allows the structure to withstand high liquid pressures during filling without requiring pressure limitations.
Solution Approach 2:
The intermediate portion and outer peripheral portion have different depression patterns optimized for their specific stress conditions. The intermediate portion's radial depressions handle the transition zone stresses, while the outer peripheral portion's circumferential depressions handle the highest hoop stresses, enabling the bottle to withstand high filling pressures.
3Stability of the object's composition
If spherical ribs are added to the bottom portion, then thermal contraction deformation is resisted, but the structure becomes more complex
Solution Approach 1:
Instead of adding spherical ribs as a separate feature, the patent segments the bottom portion into depression rows that serve multiple functions: the first depression rows handle radial expansion from thermal contraction, while the second depression rows handle circumferential stress, eliminating the need for additional spherical rib structures.
Solution Approach 2:
The depression rows serve multiple functions simultaneously: they provide structural reinforcement, absorb thermal expansion and contraction, and manage stress distribution during filling. This multi-functionality eliminates the need for separate spherical ribs, simplifying the overall structure while maintaining thermal deformation resistance.
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 effectively absorbs pressure changes, preventing deformation and improving the bottle's ability to withstand filling pressures without limiting the liquid pressure applied during filling.
Implementation Method 1
the depression is capable of becoming deformed by both a load along the central axis and a load perpendicular to the central axis in such a manner as to follow such loads in those directions
Data Source
AI summary
A plastic bottle comprises: a bottom portion 4 provided with a depression 422, wherein the depression 422 is in a direction from the bottom portion 4 toward inside the plastic bottle, the depression 422 is, in a plan view, in a shape of a concave hexagon with (i) four acute vertexes having respective interior angles that are each acute and (ii) two reentrant vertexes having respective interior angles that are each larger than 180° and smaller than 360°, the acute vertexes are each adjacent to another one of the acute vertexes and one of the reentrant vertexes, and the reentrant vertexes are each adjacent to two of the acute vertexes.