Blow-Molded Container Ribs for Strength and Weight Tradeoff
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Solution Overview
Problem
Plastic blow-molded containers face a tradeoff between weight and strength, with heavy containers being strong but costly, and lighter ones lacking sufficient strength for certain applications.
Innovation Solution
The design includes a body with specific wall configurations, ribs, a tapered flange, and a handle, optimized through injection molding and blow molding processes to enhance material orientation and crystallinity, resulting in improved top load performance, vacuum resistance, and moisture vapor transmission rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If thick walls are used to increase container strength, then top load strength is improved, but material cost and container weight increase
Solution Approach 1:
The patent applies local quality by implementing ribs at specific locations on the container body where structural support is most needed. These ribs create localized areas of increased thickness and strength without requiring the entire container wall to be thick, thus maintaining top load strength while reducing overall material usage.
Solution Approach 2:
The patent creates a composite wall structure combining areas of different thicknesses - thinner walls in non-critical areas and thicker ribbed sections in load-bearing areas. This composite approach allows the container to achieve required strength characteristics while minimizing total material consumption.
2Strength
If thick walls are used to increase container strength, then vacuum resistance is improved, but container weight increases
Solution Approach 1:
The rib structures provide localized reinforcement that resists vacuum collapse forces at critical points on the container body. By concentrating material only where vacuum pressure creates the greatest stress, the container achieves adequate vacuum resistance without the weight penalty of uniformly thick walls.
3Ease of manufacture
If thin walls are used to reduce material cost, then manufacturing cost is reduced, but container strength decreases
Solution Approach 1:
The patent implements a cost-effective design by using thin walls in non-critical areas to reduce material cost, while adding ribs only in specific locations where structural strength is required. This selective reinforcement maintains adequate container strength while minimizing overall material consumption and manufacturing cost.
4Ease of manufacture
If uniform wall thickness is used for simplicity, then manufacturing is easier, but structural efficiency decreases
Solution Approach 1:
The patent achieves structural efficiency by varying wall thickness through the addition of ribs at specific locations rather than using uniform thickness throughout. The blow molding process naturally accommodates these variable thickness sections, maintaining ease of manufacture while significantly improving structural efficiency and material distribution.
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 solution provides a lightweight, high-strength packaging product that maintains strength comparable to heavier containers while reducing material usage, suitable for various food and beverage applications.
Implementation Method 1
the preform is softened and transferred into a mold cavity
Implementation Method 2
In the mold cavity, the preforms are blow-molded or stretch blow-molded and expanded into the selected container
Data Source
AI summary
A container includes a body having opposite top and bottom walls. Opposite front and back walls each extend from the top wall to the bottom wall. Opposite first and second side walls each extend from the top wall to the bottom wall and from the front wall to the back wall. A spout extends from the top wall. A flange extends from the top wall. A handle extends from the spout to the flange.