Plastic Container Base With Stepped Ribs For Off-Center Stability
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Solution Overview
Problem
Plastic containers require a balance between attractive design, stability, and low base weight, while also being resilient to internal pressures and deformations, with the goal of reduced manufacturing pressure and improved transportability and stability, especially under off-center loading.
Innovation Solution
A plastic container design featuring a stepped base with varying height in the circumferential direction, combined with radially extending reinforcing ribs that do not intersect the stepped portion, providing enhanced stability and force distribution through a curved configuration that optimizes weight reduction and manufacturing efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If radially extending reinforcing ribs are added to increase base stability, then the stability and pressure resistance improve, but the base weight increases
Solution Approach 1:
The base is segmented into multiple functional zones: a central region with reinforcing ribs for structural support, and a circumferential region with a stepped portion for weight reduction. This segmentation allows each zone to perform its specific function optimally without compromising overall stability while minimizing weight.
Solution Approach 2:
Different regions of the base are given different structural qualities - the central region has reinforcing ribs for strength and pressure resistance, while the circumferential region has a stepped portion with varying wall thickness for weight reduction. This local differentiation achieves the desired balance between stability and weight.
2Weight of stationary object
If the base design is simplified for low weight, then the weight reduces, but the stability and resistance to deformation decrease
Solution Approach 1:
The stepped portion in the circumferential region features curved surfaces and rounded transitions instead of sharp angles or flat surfaces. This curvature distributes stress more evenly throughout the structure, enhancing resistance to deformation and pressure while maintaining the weight-reduced design.
Solution Approach 2:
The base combines different structural configurations in composite form - reinforcing ribs in the central region combined with a stepped portion in the circumferential region. This composite structure achieves both weight reduction and enhanced strength against deformation.
3Ease of manufacture
If the stepped portion extends at constant height circumferentially, then the manufacturing is simplified, but the stability under off-center loading is insufficient
Solution Approach 1:
The stepped portion varies its height locally around the circumferential region, with different sections having different wall thicknesses and heights. This local variation optimizes the distribution of structural support around the base, providing enhanced stability under off-center loading while remaining manufacturable.
Solution Approach 2:
The stepped portion introduces vertical dimensionality variation around the circumferential region, creating a three-dimensional structure that provides rotational stability. This vertical variation in height and thickness adds structural complexity that improves stability under off-center loading conditions.
4Strength
If the wall thickness is increased to improve pressure resistance, then the resilience against internal pressure improves, but the weight and manufacturing pressure increase
Solution Approach 1:
The base features local variations in wall thickness - thicker sections in the central region with reinforcing ribs for pressure resistance, and thinner sections in the circumferential stepped portion for weight reduction. This localized thickness optimization achieves pressure resistance without excessive weight.
Solution Approach 2:
The base is divided into regions with different wall thickness characteristics - the central region has greater thickness for pressure containment, while the circumferential stepped portion has reduced thickness for weight savings. This segmentation allows pressure resistance and weight reduction to coexist.
Data Source
AI summary
A plastic container has a mouth region and a main body adjoining the mouth region in a longitudinal direction (L) of the plastic container. The main body has a peripheral wall extending around in a circumferential direction of the plastic container. A container base adjoining the main body has a central region and a plurality of reinforcing ribs which, starting from the central region, extend in the direction of the circumferential wall. A stepped portion extending at least partially in the circumferential region of the plastic container is provided in a circumferential region of the container base which extends in the circumferential direction about the longitudinal direction (L), wherein a vertical position of this stepped portion varies in the longitudinal direction (L).