Strapped Plastic Container Base for Lightweight Deformation Resistance
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Solution Overview
Problem
Plastic containers face challenges in maintaining structural integrity under stress and deformation, particularly when subjected to bending, leaning, and stretching, especially in the absence of auxiliary packaging support, and require materials that balance strength and rigidity while minimizing weight.
Innovation Solution
The design incorporates varying depth ribs and a strap base rib to distribute forces, providing resistance to bending, leaning, and stretching, while maintaining hoop strength and reducing material usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If plastic container wall thickness is reduced to decrease weight, then transportation and manufacturing costs are reduced, but structural strength and resistance to deformation deteriorate
Solution Approach 1:
The base is divided into multiple functional elements including strap ribs extending from the center, load ribs positioned between strap ribs, and feet extending downward. This segmentation distributes mechanical loads across multiple discrete structural components rather than relying on uniform wall thickness, enabling weight reduction while maintaining strength.
Solution Approach 2:
Different regions of the base are assigned different structural properties: strap ribs provide radial support and distribute concentrated loads, load ribs handle vertical compression forces, and feet provide ground contact and stability. This localized optimization allows material to be concentrated where needed for strength while minimizing weight in less critical areas.
2Loss of substance
If auxiliary packaging is removed to reduce packaging material and cost, then packaging complexity is reduced, but stress on individual bottles increases
Solution Approach 1:
The base structure is pre-designed with strap ribs, load ribs, and feet that proactively distribute and manage stresses before they can cause damage. The strap ribs extend upward to meet the sidewall and distribute bending forces, while load ribs are positioned to handle vertical loads from stacking, preventing stress concentration that would occur without packaging support.
Solution Approach 2:
The base combines multiple rib structures (strap ribs, load ribs) with the container sidewall and feet to create a composite load-bearing system. This composite structure distributes mechanical stresses across different components and materials, enabling the bottle to withstand handling stresses that would normally require auxiliary packaging support.
3Ease of manufacture
If base structure is simplified to reduce manufacturing complexity, then ease of manufacture is improved, but resistance to bending and point loading deteriorates
Solution Approach 1:
The base is segmented into strap ribs, load ribs, and feet that can be formed as discrete features during injection molding. This segmentation allows each component to be optimized for its specific function while being manufactured as an integrated base structure, maintaining manufacturing simplicity while achieving complex load distribution capabilities.
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 resists deformation and maintains structural integrity under pressure and handling conditions, allowing for lightweight construction without compromising mechanical performance.
Implementation Method 1
varying depth ribs and a strap base rib to distribute forces, providing resistance to bending, leaning, and stretching
Implementation Method 2
strap base rib to distribute forces, providing resistance to bending, leaning, and stretching
Data Source
AI summary
A container includes a flat foot base having a gate centered on a central axis of the container and a sidewall connected to the base and defining a portion of an interior of the container. A plurality of strap ribs are positioned in the base, each one of which extends radially outward toward the sidewall. A plurality of recessed columns are positioned in the sidewall and formed from varying depth sidewall ribs extending along a periphery of the sidewall. Each varying depth rib includes shallow sections and deep sections, the shallow sections having a rib depth less than a rib depth of the deep sections. The shallow sections of the varying depth ribs are aligned to form the recessed columns. At least one strap rib is aligned with at least one recessed column.