Wiper Device Localized Swellings for Blown Container Fastening
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Solution Overview
Problem
Conventional wiper devices fail to securely fasten to blown glass or plastic containers due to less stringent dimensional tolerances, leading to instability and potential sliding out of the wiper element over time, which is unacceptable for high-end market standards.
Innovation Solution
A wiper device with localized swellings and windows on its outer surface, designed to ovalize and securely fit into the container neck, combined with a frustoconical wiper element and peripheral openings for residue passage, ensures a stable and interference fit seal, even with containers having less precise tolerances.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional wiper devices are used with blown glass or plastic containers, then the device structure remains simple, but the fastening stability deteriorates due to dimensional tolerances
Solution Approach 1:
The wiper device incorporates localized swellings at specific positions on its outer surface to create localized interference fits with the container mouth. These swellings are positioned at 90 degrees to each other and have diameters larger than the minimum mouth diameter, ensuring stable fastening at critical locations while maintaining overall device simplicity.
Solution Approach 2:
The swellings on the wiper device outer surface are designed with curved, spherical-cap geometries that allow elastic deformation during insertion. This curvature enables the wiper to ovalize and conform to the container mouth dimensions, creating a secure interference fit that accommodates dimensional variations in blown containers.
2Strength
If interference fit is used to fasten wiper to container, then fastening strength is improved, but manufacturing precision requirements worsen due to tolerance variations
Solution Approach 1:
The wiper device design incorporates swellings with diameters intentionally larger than the minimum container mouth diameter, creating a controlled interference fit. The swelling diameters are set to be between 0.05-0.20mm larger than the maximum mouth diameter, providing sufficient fastening strength while accommodating the ±0.20-0.50mm tolerance variations inherent in blown container manufacturing.
3Reliability
If wiper element passage section is reduced to fit pipette, then cleaning effectiveness is improved, but liquid flow resistance increases
Solution Approach 1:
The wiper element features a passage section with reduced diameter specifically at the region that contacts the pipette during withdrawal, while maintaining a larger diameter at the entry and exit regions. This localized reduction ensures effective cleaning of the pipette surface without creating excessive flow resistance for liquid passage.
Solution Approach 2:
The frustoconical shape of the wiper element with its gradually changing diameter creates a smooth transition that minimizes turbulence and flow resistance. The conical geometry allows the passage section to taper smoothly, reducing energy loss while maintaining the necessary cleaning contact area with the pipette.
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 wiper device provides a stable and secure attachment to blown glass or plastic containers, maintaining product quality by preventing drips and ensuring accurate dosing through effective cleaning and residue management.
Implementation Method 1
the hollow body features at least two localized swellings extending from an outer surface 2A of the hollow body 2 into a band F included between a second end 4 of the hollow body 2 and a wiper element 6, so as to ovalize the hollow body 2 when the wiper device 1 is inserted into a neck 27 of a container 20
Data Source
Figure 1~2
Figure 3~7
AI summary
A wiper device (1) of a blown container, comprising a hollow body (2) having a first (3) and a second end (4) defining respectively a first (3A) and a second opening (4A), a flange (5) extending from an outer surface (2A) of the hollow body (2) at the first end (3), and a wiper element (6) extending from an inner surface (2B) of the hollow body, the wiper element (6) defining a passage (6A) with a smaller section than the first and second openings (3A, 4A), characterised by the fact that the hollow body (2) features at least two localized swellings (10A, 10B) for fastening the wiper device onto the container, the said localized swellings extending from the outer surface (2A) of the wiper, near the second end (4) of the hollow body.