Inner Surface Ribs for Plastic Container Strength
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Solution Overview
Problem
Existing methods for producing plastic bottles fail to enhance top load and compression strength while reducing plastic usage, often resulting in inconsistent wall thickness and aesthetic issues due to external ribs, and do not allow for efficient recycling.
Innovation Solution
The method involves engraving ribs or patterns on the inner surface of a core rod during the blow molding process, using materials like HDPE or PP, which are then molded into containers with enhanced structural integrity and reduced plastic usage, allowing for recyclability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If ribs are added at the outer surface of the container to enhance strength, then top load and compression strength are improved, but the aesthetics of the container are obstructed and labeling efficiency is reduced
Solution Approach 1:
The patent inverts the conventional approach by placing ribs on the inner surface of the container instead of the outer surface. The core rod is provided with ribs that are imprinted during injection molding, creating internal reinforcement structures that enhance top load and compression strength without affecting the external aesthetics or labeling surfaces of the container.
Solution Approach 2:
The patent extracts the ribs from the outer surface and relocates them to the inner surface by using a ribbed core rod for injection molding. This separation allows the external surface to remain smooth and aesthetically pleasing while the internal structure provides the necessary mechanical strength.
2Strength
If the wall thickness of the preform is increased to provide stiffness, then structural integrity is improved, but the amount of plastic used increases leading to wastage
Solution Approach 1:
The patent applies local quality by adding ribs only at specific locations on the inner surface of the container where structural reinforcement is needed, rather than uniformly increasing the wall thickness throughout. This localized reinforcement provides the necessary stiffness and structural integrity while minimizing the additional plastic material required.
3Ease of manufacture
If the core rod is smooth as in conventional blow molding, then the manufacturing process is simple, but the container lacks enhanced structural properties and top loading strength
Solution Approach 1:
The patent applies preliminary action by pre-forming ribs on the core rod before the injection molding process. The ribbed core rod is prepared in advance, and during injection molding, these ribs are imprinted onto the preform, creating the desired internal reinforcement structure without adding complex steps to the manufacturing process.
Data Source
AI summary
A method of producing containers with at least one enhanced property, such as high strength, sturdy, durable, and recyclable are described herein. The container so formed have ribs/patterns at the inner surface, leaving the entire outer surface for decorative or marketing purposes. The ribs/pattern is selected from linear lines, curved lines, honeycombs, hexagons, square, rectangular, circular and combination thereof. The containers so formed may have reduced amount of materials used.