Metal Container Neck Geometry for Single-Head Seaming
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Solution Overview
Problem
Current metal containers require complex seaming machines to mount standard metal screw caps, which is not feasible for single beading/threading head machines, and they do not ensure tight sealing with standard caps.
Innovation Solution
A metal container with a neck design featuring a constant thickness wall, including a thread and a ring collar with specific geometric characteristics, allowing for the reception of standard screw caps and enabling mounting by a single beading/threading head seaming machine, ensuring tightness and compatibility with existing standards.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a metal container uses a conventional neck structure with thread and ring collar, then it can receive a screw cap, but it requires complex double beading/threading head seaming machines for mounting
Solution Approach 1:
The patent applies parameter changes by precisely defining the thread geometry parameters (crest radius 0.85-1.2mm, root radius 0.5-0.7mm, pitch 3-3.3mm) and ring collar parameters (lower flank angle 20°-30°, external edge radius 0.7-0.9mm, internal edge distance 13-15mm from free edge). These parameter optimizations enable the neck to work with standard screw caps while being compatible with single beading/threading head seaming machines, resolving the contradiction between manufacturing simplicity and sealing reliability
2Reliability
If a metal container uses a neck designed for standard screw caps, then it achieves tight sealing, but it forces the use of specific caps requiring complex seaming machines
Solution Approach 1:
The patent achieves universality by designing a neck structure that can receive standard screw caps (compatible with MCA2 or XP H35-107 standards) while being manufacturable with common single beading/threading head seaming machines. The optimized thread and ring collar geometry allows the neck to fulfill multiple functions: providing tight sealing with standard caps and compatibility with simplified manufacturing equipment
3Ease of manufacture
If the neck wall thickness is reduced to allow deformation, then standard screw caps can be mounted, but internal varnishes may be damaged
Solution Approach 1:
The patent applies parameter changes by optimizing the neck wall thickness to a constant or approximately constant value that provides sufficient deformation capacity for cap mounting while maintaining structural integrity. The constant thickness design ensures uniform stress distribution during deformation, preventing varnish damage while enabling standard cap installation
Data Source
AI summary
Disclosed is a metal container including a neck, wherein a screw thread and a ring collar are provided. The screw thread: —includes a top radius between 0.85 and 1.2 mm and a bottom radius between 0.5 and 0.7 mm; —the lower flank of the ring collar, which diverges from the top flank in the direction of the longitudinal axis, defines an angle of between 20° and 30° relative to a plane perpendicular to the longitudinal axis; —the outer rim of the bottom flank of the ring collar has a radius between 0.7 and 0.9 mm, and—the inner rim of the lower flank of the ring collar is provided at a distance of between 13 and 15 mm relative to the free rim of the neck.