Glass Closure Cover With Offset Threads And Adhesive Seal
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Solution Overview
Problem
Existing press-on/twist-off closures for glass or plastic containers require long axial skirt portions for hermetic sealing, leading to excessive material usage and difficulty in opening, especially after vacuum formation due to cooling, which complicates the balance between sealing and ease of opening for consumers, including older people and children.
Innovation Solution
A closure unit with a sheet metal cover featuring circumferentially offset threaded elements and a plastics layer that adheres to a transition zone and skirt portion, allowing for a shorter axial skirt while maintaining adequate sealing and reducing the twisting force required for opening, thus optimizing material usage and user accessibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the axial skirt portion is made long to ensure hermetic sealing, then sealing quality is improved, but material consumption increases and opening difficulty increases
Solution Approach 1:
The patent transitions from a purely axial sealing approach to a combined axial-radial sealing mechanism. The skirt portion is shortened axially but widened radially, and the sealing interface is moved to the radial flange region rather than relying solely on axial length. This dimensional shift allows adequate sealing with reduced material usage.
Solution Approach 2:
The patent changes the geometric parameters of the closure cover, specifically reducing the axial height of the skirt portion while optimizing the radial dimensions of the flange and sealing surfaces. This parameter optimization maintains sealing effectiveness while minimizing material consumption.
2Reliability
If the axial skirt portion is made long to ensure hermetic sealing, then sealing quality is improved, but opening difficulty increases
Solution Approach 1:
The patent shifts the sealing function from the axial skirt region to the radial flange region. This dimensional repositioning creates a shorter axial profile that reduces the vacuum seal strength, thereby lowering the opening torque required while maintaining adequate sealing through the radial flange-sealing surface interface.
Solution Approach 2:
The patent optimizes geometric parameters to balance sealing and opening characteristics. By reducing axial height and adjusting radial dimensions, the vacuum seal strength is controlled to be sufficient for preservation but not excessive, enabling easier opening by consumers including older people and children.
3Loss of substance
If circumferentially offset threaded elements are used instead of continuous thread, then material usage is reduced, but sealing reliability may be compromised
Solution Approach 1:
The patent divides the continuous thread into discrete circumferentially offset threaded elements or segments. This segmentation reduces material usage while the segments work together to provide adequate engagement and sealing. The staggered arrangement ensures continuous contact along the axial direction while using less material than a continuous thread.
Solution Approach 2:
The patent applies threaded elements only in specific localized regions where engagement is needed, rather than using a continuous thread around the entire circumference. This localized application reduces material consumption while maintaining sufficient sealing and engagement functionality through strategic placement of the threaded segments.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution achieves a compact closure design that reduces material consumption and ensures easy opening by older people and children, maintaining effective sealing and reducing the twisting force needed, while accommodating vacuum conditions within the container.
Implementation Method 1
a plastics layer which, on the inside of the cover, rests on a circumferential transition zone and on the skirt portion, more specifically resting thereon in a stable adhesive manner
Data Source
AI summary
What is proposed is a closure unit consisting of a glass container (50) with external, circumferentially offset threaded elements (54, 55) on a container neck (52) of the glass container, and a closure cover made of sheet metal, wherein the closure cover (1, 2) has an encircling plastics layer (30; 30h, 30v) on the inside of the cover. The closure cover is pressed onto the container neck (52) and can be opened with a rotational movement via the threaded elements (54, 55) and a vertical section (30v) of the plastics layer. The container neck (52) has a horizontal end surface (52a) on which a horizontal section (30h) of the plastics layer rests under pressure in a sealing manner. A central region (11) of the closure cover passes with an adjoining, circumferentially oriented transition zone (11a, 11b, 11c) into an axially downwardly projecting skirt section (12) which ends in a roll-up region (21a, 21; 22). The plastics layer (30; 30h, 30v) is arranged on the inside of the cover in a manner adhering to the transition zone (11a, 11b, 11c) and the skirt section (12). An axial extent (h.sub.0) of the skirt section (12) and a radial dimension (b52) of the horizontally oriented end surface (52a) of the container neck (52) form a first ratio (v.sub.1) which is smaller than three.