Synthetic Resin Container Dome Shoulder Reinforcement
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Solution Overview
Problem
Conventional synthetic resin containers experience deformation and reduced strength in the dome-like shoulder region due to changes in inner pressure during hot filling and cooling, affecting both aesthetic appearance and structural integrity.
Innovation Solution
The container features a dome-like shoulder portion with rhombic bulging portions arranged circumferentially, each with a rhombic outer edge and a smaller rhombic inner edge forming a depression, and a vertical rib, which enhances both longitudinal and radial strength by maintaining a dome-like shape and preventing buckling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If a dome-like region is used in the shoulder portion, then the external appearance is improved, but the structural strength and resistance to deformation under pressure changes deteriorates
Solution Approach 1:
The dome-like region is segmented into multiple bulging portions arranged circumferentially, with each bulging portion having an outer edge and an inner edge that forms a depression. This segmentation creates multiple reinforcement ribs that distribute stress and prevent deformation while maintaining the overall dome-like appearance.
Solution Approach 2:
The invention adds a third dimension by forming depressions at the inner edges of the bulging portions, creating a multi-level surface structure. This dimensional change allows the container to maintain its dome-like external shape while incorporating internal reinforcement features that enhance structural strength without compromising appearance.
2Strength
If the dome-like region is made more robust to increase strength, then the resistance to deformation is improved, but the aesthetic appearance and smooth contour deteriorates
Solution Approach 1:
The dome-like region incorporates local variations in quality by adding bulging portions with depressions at specific locations. These localized features provide reinforcement where needed while maintaining the smooth overall contour. The depressions are positioned strategically to create reinforcement ribs that enhance strength without creating visible defects in the aesthetic appearance.
3Strength
If rhombic bulging portions with depressions are added to the dome-like region, then the strength in multiple directions is improved, but the manufacturing complexity increases
Solution Approach 1:
The bulging portions are formed with curved surfaces that follow the dome-like contour, using spherical or conical geometries that are well-suited for blow-molding processes. The depressions are formed as concave spherical or conical surfaces, which can be achieved through standard molding techniques. This use of curved geometries simplifies manufacturing compared to sharp angular features.
Data Source
AI summary
A novel synthetic resin container includes an entirely or partly dome-like shoulder portion interconnecting a mouth portion and an upper end of a body portion, and provides high strength at the shoulder portion and excellent aesthetic appearance. The shoulder portion has a dome-like region with a plurality of rhombic and triangular bulging portions arranged in the circumferential direction, each protruding outward from its rhombic or triangular outer edge toward its inner edge. The plurality of triangular bulging portions are arranged between the rhombic portions. The rhombic inner edge defines a region protruding inward of the container and thereby forming a rhombic depression, which is provided with a rib having a vertical contour line that protrudes outward. The triangular inner edge defines a region protruding inward of the container so as to form a triangular depression, which is provided with a rib having a vertical contour line that protrudes outward.