Thin-Walled Bottle Bottom with Alternating Ridges
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Solution Overview
Problem
Thin bottles made of synthetic resin material are prone to bending and division of the ground contact portion when a compressive load is applied, as the existing designs lack sufficient rigidity and stress distribution.
Innovation Solution
The bottle features a cylindrical shape with a bottom portion including a ground contact portion, a tubular heel, and an inner peripheral wall with alternating concave and convex portions that increase rigidity and distribute stress evenly, preventing deformation and bending when a live load is applied.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If the bottle is made thin to reduce weight and material usage, then weight and material consumption decrease, but the ground contact portion becomes prone to bending and division when compressive load is applied
Solution Approach 1:
The inner peripheral wall portion is divided into multiple segments by forming concave portions at intervals in the circumferential direction. This segmentation creates multiple rigid sections that collectively enhance the overall rigidity of the thin bottom wall, preventing the ground contact portion from bending and dividing under compressive load while maintaining the thin-wall design for weight reduction
Solution Approach 2:
The bottom wall portion is designed with non-uniform thickness and localized structural features: the inner peripheral wall portion has enhanced rigidity through concave portions, the connecting portion has convex portions for stress distribution, and the ground contact portion has increased thickness. This local quality enhancement provides strength where needed while keeping the overall bottle wall thin for weight reduction
2Ease of manufacture
If the bottle wall is made thin to improve ease of manufacture and reduce cost, then manufacturing complexity and material cost decrease, but the rigidity of the bottom wall portion decreases causing deformation under load
Solution Approach 1:
The bottom wall structure is segmented into distinct functional zones (inner peripheral wall portion with concave portions, connecting portion with convex portions, and ground contact portion) that can be formed in a single molding process. This segmentation provides enhanced rigidity through geometric features while maintaining ease of manufacture via integral forming without additional assembly steps
Solution Approach 2:
The concave and convex portions add dimensional complexity to the bottom wall structure, creating a three-dimensional reinforced geometry that significantly improves rigidity. These dimensional features are integrated into the molding process, so the enhanced rigidity is achieved without adding manufacturing complexity or assembly steps
3Device complexity
If conventional bottom wall design is used to simplify the structure, then device complexity decreases, but stress concentration occurs at the connecting portion causing deformation and ground contact portion division
Solution Approach 1:
The connecting portion between the inner peripheral wall and depressed wall is designed with convex portions that locally enhance stress distribution. This localized structural feature prevents stress concentration at the critical connecting zone while maintaining overall structural simplicity and avoiding complex multi-component designs
Solution Approach 2:
The bottom wall is segmented into functionally distinct portions (inner peripheral wall with concave portions for rigidity, connecting portion with convex portions for stress distribution, and ground contact portion for load bearing). This segmentation allows each zone to be optimized for its specific function while collectively providing uniform stress distribution and preventing deformation under load
Data Source
AI summary
According to the present invention, there is provided a bottle formed of a synthetic resin material in a cylindrical shape with a bottom, the bottle includes a bottom portion which includes a bottom wall portion and a heel portion, in which the bottom wall portion includes an inner peripheral wall portion and a depressed wall portion, a plurality of concave portions are formed on the inner peripheral wall portion, the plurality of concave portions are located on the inner peripheral wall portion at least in a portion including a lower end edge of the inner peripheral wall portion, a plurality of convex portions are formed at a connecting portion between the inner peripheral wall portion and the depressed wall portion, and the plurality of concave portions and the plurality of convex portions are provided alternately in the circumferential direction.