Recessed Base and Concave Rib Container Design
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Solution Overview
Problem
Existing plastic container designs with rib and base configurations face challenges in manufacturing, particularly in extrusion blow molding, as they can cause containers to deform under thermal and pressure changes, and may hinder timely release from the mold during production.
Innovation Solution
A container design featuring a contoured base recess and concave ribs with specific geometric ratios and radiused transition surfaces, allowing for improved structural strength and manufacturability, including a ratio of maximum base recess height to rib height between 1:3 and 1:5, and radiused transition surfaces with a radius of curvature of at least 0.10 inches, facilitating easier ejection from the mold.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a pronounced recessed base and concave ribs are incorporated into the container design to improve structural strength, then the container's resistance to deformation under thermal and pressure changes is improved, but the container may not release from the mold cavity in a timely manner during extrusion blow molding
Solution Approach 1:
The patent applies parameter changes by establishing a specific ratio relationship between the base recess depth (hbr) and rib height (hr), where hbr:hr is between 1:3 and 1:5. This quantitative parameter control allows the design to achieve optimal structural strength while ensuring the container can be properly ejected from the mold, resolving the contradiction between strength and manufacturing efficiency
2Strength
If ribs are located near the base of the container to prevent deformation, then the structural characteristics are improved, but the manufacturing complexity increases
Solution Approach 1:
The patent applies local quality by concentrating the reinforcement features (concave ribs and recessed base) specifically at the lower portion of the container where structural support is most needed. This localized approach provides enhanced structural characteristics at critical areas without unnecessarily complicating the entire container design or manufacturing process
Data Source
AI summary
A container including a body having a base defining a closed end, a finish defining an opposite open end, and a sidewall between the base and finish. The base includes a support surface defining a reference plane and a contoured base recess extending inwardly from the support surface to a maximum base recess height “hbrmax” from the plane. The sidewall includes a concave rib extending circumferentially around the body. A center of the rib is disposed at a rib height “hr” from the plane. The ratio “hbrmax:hr” is between 1:3 and 1:5. The rib includes a radiused transition surface extending from the base to an angled inner surface and having a radius of curvature “r1” of at least 0.10 inches. The angled inner surface has an angle “a” relative to the plane of between 28 and 80 degrees. A method and mold assembly for making the container are also provided.