Threaded Cosmetic Container Closure With Tactile End Stop
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Solution Overview
Problem
Existing packaging devices for cosmetic products, particularly those made of glass, face challenges in producing high-quality tactile or audible closure indicators due to large radii of curvature limitations, which affect attractiveness and dirt accumulation, and are difficult to manufacture.
Innovation Solution
A packaging device with a threaded neck and closure member that uses thread interruptions and elastically deformable tongues to provide tactile and/or audible feedback without requiring protuberances on the container shoulder, allowing for glass compatibility and easy production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional packaging machine is used with a container having a finish line, then the container can be formed and sealed, but the closure member cannot be properly engaged because the finish line creates an interference with the threading engagement
Solution Approach 1:
The container neck is divided into distinct functional zones: a first portion with external threading and a second portion with the finish line. This segmentation allows the threading and finish line to be spatially separated, eliminating interference between the closure engagement and the finish line function.
Solution Approach 2:
The threading is moved from a single-circumference design to a multi-circumference design where threads wrap around the container neck multiple times. This dimensional change allows the threading to extend along the longitudinal axis, clearing the interference zone created by the finish line while maintaining engagement functionality.
2Productivity
If the container neck is shortened to improve packaging efficiency, then productivity increases, but the closure member cannot be properly engaged due to insufficient space for threading
Solution Approach 1:
The threading geometry is changed from a single-circumference pattern to a multi-circumference pattern that wraps around the neck multiple times. This allows the threading to achieve sufficient engagement length within a shorter axial distance, enabling proper closure engagement while maintaining a compact neck length for high-speed packaging.
Solution Approach 2:
The threading parameters are modified to include multiple circumferential wraps instead of a single wrap. This parameter change increases the effective threading engagement distance without increasing the axial length of the neck, thus maintaining productivity while enabling proper closure engagement.
3Reliability
If the container neck is lengthened to allow proper threading engagement, then closure engagement is improved, but the packaging efficiency and productivity decrease
Solution Approach 1:
The threading is designed to wrap around the container neck multiple times in a helical pattern. This multi-circumference threading achieves the necessary engagement reliability within a shorter axial distance, eliminating the need to lengthen the neck while maintaining high packaging efficiency.
4Productivity
If a multi-circumference threading is used, then proper engagement is achieved in a shorter neck length, but the manufacturing precision requirements increase
Solution Approach 1:
The threading is segmented into multiple circumferential wraps with defined start and end points. This segmentation allows for standardized thread profiles and pitch measurements, making the manufacturing process more controllable and precise compared to a single complex wrap.
Solution Approach 2:
The threading design uses standard thread parameters (pitch, depth, angle) that can be precisely controlled during molding. By defining the threading as multiple circumferential wraps with consistent parameters, the manufacturing precision requirements become manageable through standard quality control methods.
Data Source
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AI summary
Device (1) for packaging a product, in particular a cosmetic product, having: - a container (2) for containing the product, provided with a threaded neck (4) of longitudinal axis (Z), at least one screw thread (10) having, on the side of the free end of the neck, a thread starting point (13), and - a closure member (3) for closing the container (2) that is arranged to be screwed onto the neck (4), the closure member (3) having at least one stop (16) arranged to come to bear against the thread starting point (13) at the end of the screwing of the closure member (3) onto the neck (4) of the container (2) to block the rotation of the closure member (3).