Lightweight Plastic Container Neck Structure for Stable Preform Handling
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Solution Overview
Problem
Existing plastic containers and preforms face challenges in achieving stability and handling while maintaining reduced weight for economic efficiency.
Innovation Solution
The design of a plastic container with a reduced neck portion weight and center of gravity, utilizing a support flange and tamper-evident features, along with a neck portion weight of 3.0 grams or less, and specific vertical dimensions to enhance stability and handling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If the neck portion weight is reduced to 3.0 grams or less, then the overall container weight is reduced for economic efficiency, but the stability and handling of the preform may be compromised
Solution Approach 1:
The container is divided into distinct functional segments: a reduced-weight neck portion (3.0g or less) for economic efficiency, and a separate base portion with enlarged dimensions (at least 0.5 inches in diameter) providing stability. This segmentation allows each part to be optimized independently for its specific function.
Solution Approach 2:
The base portion is designed with enlarged horizontal dimensions (at least 0.5 inches in diameter) to compensate for the reduced vertical weight of the neck portion. By distributing mass in a different dimensional arrangement, the center of gravity is lowered while maintaining overall weight reduction.
2Stability of the object's composition
If the neck portion vertical distance is reduced to 0.580 inches or less, then the center of gravity is lowered for improved stability, but the manufacturing precision requirements increase
Solution Approach 1:
The neck portion vertical distance is specified as 0.580 inches or less, and the base portion diameter is specified as at least 0.5 inches. By establishing clear parameter thresholds rather than requiring exact dimensional control, the design achieves center of gravity optimization while accommodating normal manufacturing variations.
3Stability of the object's composition
If the base portion is enlarged to at least 0.5 inches in diameter, then the stability and handling of the preform is improved, but the material usage and manufacturing complexity increase
Solution Approach 1:
The container is segmented into a simple cylindrical neck portion and a separately optimized base portion. This segmentation allows the base to be designed as a simplified enlarged cylinder rather than a complex integrated structure, reducing mold complexity while maintaining stability.
Solution Approach 2:
The base portion is designed with locally optimized properties: enlarged horizontal dimensions (at least 0.5 inches in diameter) for stability, and specific wall thickness (0.002 to 0.006 inches) for structural integrity. This localized optimization avoids the need for complex overall结构设计.
Data Source
AI summary
A plastic container includes a hollow body portion including a lower supporting base portion; a sidewall portion extending upwardly from the base portion; and a neck portion extending upwardly from the sidewall portion. The neck portion includes a support flange having an upper and lower surface, at least one thread, and a dispensing opening at the top of the neck portion. In embodiments, a closure may be provided to form an assembly. A preform and method for making a container are also disclosed.