Strapped Plastic Container Base for Bending and Leaning Resistance
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Solution Overview
Problem
Plastic containers face challenges in maintaining structural integrity under stress and deformation, particularly during shipping and handling, especially when auxiliary packaging is removed, and they need to resist bending, leaning, and stretching while minimizing material usage.
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 integrity and resistance to deformation under stress worsen
Solution Approach 1:
The base is divided into multiple functional zones including footed portions, strap ribs, and load-bearing ribs that segment the structural support functions. This segmentation allows each zone to specialize in specific stress resistance while using minimal material overall.
Solution Approach 2:
Different regions of the base have different thicknesses and structural properties - footed portions have concentrated material for point load resistance, while strap ribs provide tensile strength in specific directions. This local quality optimization reduces overall material usage while maintaining strength where needed.
2Loss of substance
If auxiliary packaging is removed to reduce packaging material usage, then packaging costs are reduced, but stress and deformation resistance of the container worsens
Solution Approach 1:
The container base is pre-designed with integrated strengthening features including strap ribs and footed portions that proactively prepare the structure to withstand shipping stresses without requiring external packaging support.
Solution Approach 2:
The container base serves its own support function through self-contained structural features like the strap ribs and load-bearing ribs, eliminating the need for external paperboard or film packaging for structural support during transportation.
3Quantity of substance
If base material is reduced to achieve lightweight construction, then manufacturing costs are reduced, but resistance to bending and point loading failures worsens
Solution Approach 1:
The footed portions and strap ribs incorporate curved and domed geometries that naturally distribute point loads across broader areas. The curved surfaces of the footed portions convert concentrated point loads into distributed radial stresses, reducing bending moments.
Solution Approach 2:
The base combines different polymer materials or material densities in different zones - potentially using reinforced materials in high-stress strap rib areas and lighter materials in less critical regions, creating a composite structure that optimizes strength-to-weight ratio.
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
the strap ribs and recessed columns distribute bending and top load forces along the wall to resist deformation
Implementation Method 2
the bottle can be pressurized to help the bottle retain its shape. As another example, the bottle can be pressurized with certain gases to help preserve a beverage contained in the bottle
Implementation Method 3
PET and other resins tend to relax at temperatures normally seen during use. This relaxation is a time dependent stress relieving response to strain
Implementation Method 4
An example of the small scale is the flexing or folding of ribs or other small features on the wall of the bottle. When they are held in this position with time, the ribs will permanently deform through relaxation
Data Source
AI summary
A container may have a base, a sidewall connected to the base, a bell connected to the sidewall, and a finish connected to the bell. The base may have strap ribs to resist deformation of the base. The sidewall may have recessed columns to resist bending, leaning, crumbling, and/or stretching. The strap ribs and recessed columns may vertically line up along a central axis of the container to communicate forces on the container vertically along the container to continuously resist deformation in the base and the sidewall.