Blow Molded Container Transfer Ring Arcuate Recesses
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Solution Overview
Problem
Blow molded containers with large diameter transfer rings are prone to deformation at the junction with the neck portion when subjected to compressive loads, such as during stacking, due to the increased height of the transfer rings required for conformance with molding surfaces.
Innovation Solution
The introduction of a transfer ring with a plurality of arcuate recesses in the sidewall, along with elongated domes protruding inwardly, to reduce deformation by distributing compressive forces and increasing resistance to bending and buckling at the junction of the top ring surface and neck.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the transfer ring height is increased to ensure complete conformance with molding surfaces, then the diameter of the transfer ring can be enlarged for broader grasping device suitability, but deformation at the junction of the transfer ring and neck portion increases under compressive loads
Solution Approach 1:
The patent applies local quality by introducing arcuate recesses at specific locations in the transfer ring sidewall, creating zones of varying wall thickness. These recesses concentrate material at critical stress points while maintaining overall geometric requirements, thereby locally enhancing strength at the junction area without compromising the overall transfer ring diameter or grasping functionality.
Solution Approach 2:
The patent employs curvature by designing the recesses with arcuate geometries that follow the natural stress flow patterns in the transfer ring. The curved shapes of the recesses and the domed protrusions create smooth transitions that distribute stress more evenly, preventing stress concentration and reducing deformation under compressive loads.
2Length of stationary object
If the transfer ring height is increased to ensure complete conformance with molding surfaces, then the diameter of the transfer ring can be enlarged, but the potential for unacceptable deformation under compressive loads increases
Solution Approach 1:
The patent applies local quality by introducing arcuate recesses at specific locations in the transfer ring sidewall, creating zones of varying wall thickness. These recesses concentrate material at critical stress points while maintaining overall geometric requirements, thereby locally enhancing strength at the junction area without compromising the overall transfer ring diameter or grasping functionality.
Solution Approach 2:
The patent creates a composite-like structure within the homogeneous plastic material by forming recesses and domed protrusions that concentrate material where needed. This internal structural composition varies the effective material distribution, creating regions of enhanced stiffness and strength at the junction area while maintaining the overall transfer ring geometry.
3Strength
If arcuate recesses are introduced in the transfer ring sidewall to reduce deformation, then resistance to compressive forces is improved, but the structural complexity of the transfer ring increases
Solution Approach 1:
The patent applies parameter changes by modifying the wall thickness distribution through arcuate recesses and domed protrusions. These geometric parameter changes concentrate material at critical stress locations, enhancing compressive resistance without adding separate components or complex assembly structures. The modifications are achieved through a single molding operation with adjusted cavity geometry.
Data Source
AI summary
A blow molded container comprises a transfer ring open to the container body and characterized by a plurality of arcuate recesses in the sidewall thereof disposed to reduce deformation at the junction of the top transfer ring surface and container neck resulting from compressive forces acting on the neck along the longitudinal axis of the container. Advantageously an elongated dome protrudes outwardly from each sidewall recess, each dome being open to the interior of the container. A blow mold assembly for extrusion blow molding of a container according to the invention comprises first and second mating mold components, each mating mold component comprising molding surfaces open to a mating face of the mold component. Advantageously each mating mold component comprises a removable insert comprising the molding surfaces defining the neck and transfer ring of the container.