Applicator Wheel Vacuum Manifold for Precise Particulate Filling
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Solution Overview
Problem
High-speed manufacturing of particulate-filled articles, such as cigarette filters, faces challenges in achieving consistent and precise filling of cavities with minimal scatter and 100% fill efficiency due to existing technologies that result in excessive pulverization and scattering of particulate material during transfer from one wheel to another.
Innovation Solution
An applicator wheel with equally spaced peripheral pockets having perforated bottom walls and a vacuum manifold that adjusts its position and operation based on machine speed to ensure precise and scatter-free discharge of particulate material into cavities, utilizing a combination of vacuum and pressurized air to manage the filling process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a transfer wheel is used to deliver particulate material from a metering wheel, then the particulate material can be delivered to multiple cavities, but the pockets in the transfer wheel must be larger than in the metering wheel resulting in difficulty to achieve 100% fill
Solution Approach 1:
The system is divided into two independent applicator wheels (first and second applicator wheels) instead of using a transfer wheel. Each wheel has its own pockets that receive and deliver particulate material directly to cavities. This eliminates the need for intermediate transfer and avoids the pocket size mismatch problem that prevented 100% fill completion.
Solution Approach 2:
Instead of using a single metering wheel transferring to a larger transfer wheel, the invention inverts the approach by using two applicator wheels of comparable size that both receive material from a common supply. This reverses the traditional metering-transfer sequence and eliminates the fill completeness problem.
2Productivity
If high speed manufacturing is used to increase production output, then productivity increases, but consistent accurate filling of cavities becomes difficult to achieve
Solution Approach 1:
The two applicator wheels operate in continuous sequence, with each wheel delivering material to different sets of cavities. This continuous operation maintains high productivity while ensuring consistent filling accuracy through the synchronized rotation and precise positioning of both wheels.
Solution Approach 2:
The system uses adjustable mechanisms including adjustable applicator wheels that can be positioned at different angular orientations. This dynamic adjustability allows the system to maintain precise filling accuracy across varying production speeds by optimizing the delivery timing and positioning of particulate material.
3Measurement precision
If vacuum is applied to draw particulate material into pockets, then material can be metered into pockets, but excessive pulverization and scattering of particulate material occurs
Solution Approach 1:
The harmful effect of vacuum-induced pulverization is eliminated by removing the vacuum mechanism entirely from the material delivery system. Instead of using vacuum to draw material into pockets, the invention uses gravity-fed material supply that allows particulate material to flow naturally into the pockets of both applicator wheels without excessive force that would cause scattering.
4Volume of moving object
If pockets are made larger to accommodate transfer wheel requirements, then material transfer is possible, but 100% cavity fill cannot be achieved
Solution Approach 1:
Each applicator wheel is equipped with pockets of optimized size that are locally tailored to the specific cavity filling requirements. Both sets of pockets (first and second applicator wheels) have dimensions that precisely match their respective cavity targets, eliminating the need for oversized pockets required by transfer wheel designs.
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 enables efficient and timely filling of cavities with metered amounts of particulate material, maintaining high fill efficiency and minimizing scatter across varying production speeds, ensuring consistent and precise delivery of particulate material into cavities.
Implementation Method 1
A vacuum chamber within the manifold supplies vacuum to the perforated bottom wall of each pocket as the wheel rotates
Implementation Method 2
The manifold includes a vacuum relief downstream from the vacuum chamber for discharging the particulate material from the pockets into the cavities at a predetermined discharge location on the wheel
Data Source
AI summary
A machine and process function to fill cavities with metered amounts of particulate material. An applicator wheel includes a series of equally spaced apart peripheral pockets each having a perforated bottom wall, and a vacuum manifold inside the wheel includes a vacuum chamber for supplying vacuum to the perforated bottom walls of the pockets as the wheel rotates. Particulate material from a filling chamber of such material outside the wheel is withdrawn into the pockets by the vacuum chamber. A downstream vacuum relief on the vacuum manifold functions to discharge particulate material from the pockets into the cavities at a predetermined discharge location on the wheel. Adjustment structure is connected to rotatably adjust the position of the vacuum manifold within the applicator wheel to thereby advance or retard the discharge location depending upon the speed of the machine.