Threaded Metal Container Bead Design for Neck Rigidity
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Solution Overview
Problem
Thinned materials in threaded metal containers lead to insufficient neck portion transverse rigidity during the capping process, causing local deformation, especially in wide-mouth containers with a high mouth-to-body diameter ratio.
Innovation Solution
A threaded metal container design featuring a bead portion with a height of 0.1 to 0.6 mm and a radius of curvature of 0.5 to 2.5 mm at the base of the mouth portion, which improves transverse rigidity without altering the container's axial dimensions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If material thickness is reduced to lower production cost, then weight and material usage decrease, but neck portion transverse rigidity becomes insufficient causing local deformation during capping
Solution Approach 1:
The invention applies a bead portion at the base of the mouth portion that locally increases rigidity only where needed during capping, rather than uniformly thickening the entire container wall. This localized structural enhancement allows material thickness reduction in non-critical areas while maintaining sufficient transverse rigidity at the neck portion during the capping process.
Solution Approach 2:
The bead portion is pre-formed on the container before the capping process, providing preliminary reinforcement to the neck portion. This preliminary structural preparation ensures that when the capping load is applied, the reinforced bead portion is already in place to prevent local deformation, eliminating the need for thicker materials throughout the container.
2Ease of manufacture
If material thickness is reduced, then production cost decreases, but local deformation occurs during capping process
Solution Approach 1:
Instead of uniformly increasing material thickness throughout the container, the invention applies a localized bead portion only at the base of the mouth portion where reinforcement is needed. This localized approach maintains ease of manufacture with standard thin materials while preventing deformation in the critical neck area during capping.
Solution Approach 2:
The bead portion is formed as a preliminary structural feature before capping, preparing the neck portion to withstand the capping load. This preliminary reinforcement allows the use of thinner, easier-to-manufacture materials while still achieving the required deformation control during the capping process.
3Strength
If bead portion height is increased to improve transverse rigidity, then neck portion strength increases, but axial strength may be compromised
Solution Approach 1:
The invention optimizes the bead portion height within a specific range (0.1 to 0.6 mm) to achieve the desired balance between transverse rigidity and axial strength. By carefully controlling this geometric parameter, the bead provides sufficient reinforcement against radial deformation during capping while maintaining adequate axial load-bearing capacity for the container's intended use.
Solution Approach 2:
The bead portion is designed with specific dimensional parameters that provide localized transverse reinforcement without significantly affecting axial properties. The controlled height and radial dimensions of the bead create a localized stiffness enhancement that addresses transverse rigidity needs while preserving axial strength through careful parameter selection.
Data Source
AI summary
A threaded metal container capable of improving strength (neck portion transverse rigidity) in a direction perpendicular to a container axis at a neck portion composed of a mouth portion and a shoulder portion. The container includes a body portion, a shoulder portion, and a mouth portion. The mouth portion includes a base portion connected to an upper end of the shoulder portion, and a skirt valley portion, a skirt portion, and a threaded portion, which are above the base portion. The base portion 8 includes a protruding portion protruding radially outward and has a diameter gradually increasing downward from the skirt valley portion and a bead portion radially inwardly protruding and smoothly curving downward from the protruding portion. The bead portion circumferentially extends in a linear or dotted pattern. The bead height between the protruding portion and the bead portion in the direction perpendicular to the container axis is 0.1 to 0.6 mm.