Clocked Metering Roller for Precise Particulate Dosing
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Solution Overview
Problem
Existing methods and devices for applying superabsorbent particulate material in absorbent hygiene products are inadequate for precise application of small quantities, typically resulting in non-constant application and unsatisfactory distribution due to the use of continuous metering rollers and methods that are not suitable for fine-grained or powdered materials.
Innovation Solution
A method and device using a metering roller controlled in a clocked manner with a rotation angle of more than 30° and less than 120° per cycle, combined with a discharge angle and a guide arrangement, to accurately apply small quantities of particulate material by accelerating and decelerating the roller according to the movement of components, ensuring complete emptying of cavities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a continuous metering roller is used to apply particulate material, then the application process is simple and continuous, but the dosing precision and distribution uniformity deteriorate for small quantities of fine-grained materials
Solution Approach 1:
The metering roller is segmented into multiple cavities that are distributed around its circumference. Each cavity acts as an individual dosing unit, allowing precise control of material distribution. The cavities are arranged in patterns (e.g., alternating rows) that enable selective positioning over different target areas, achieving both precision and flexibility without requiring complex mechanical mechanisms.
2Manufacturing precision
If the metering roller is operated at constant speed, then the operation is simple and stable, but the ability to adapt to varying machine cycles and achieve precise dosing deteriorates
Solution Approach 1:
The metering roller is operated with periodic acceleration and deceleration cycles rather than at constant speed. During acceleration phases, cavities are positioned to receive particulate material; during deceleration phases, cavities are positioned to discharge material onto the target structure. This periodic motion pattern enables precise control of dosing timing and quantity while maintaining relatively simple operational control through automated cycle coordination.
3Adaptability or versatility
If cavities are evenly distributed around the metering roller, then the structure is simple and uniform, but the adaptability to different target areas and component spacing deteriorates
Solution Approach 1:
The cavities are arranged with non-uniform spacing and in alternating rows around the metering roller circumference. This creates local variations in cavity positioning that allow different sections of the roller to be selectively positioned over different target areas. The alternating row pattern provides flexibility to adapt to varying component spacing and target area requirements without requiring fundamentally different roller designs for each application.
4Productivity
If a large rotation angle is used per clock cycle, then the dosing speed increases, but the acceleration time decreases and dosing accuracy deteriorates
Solution Approach 1:
The metering roller employs dynamic speed control with varying rotation angles per clock cycle rather than uniform rotation. The rotation angle is adjusted based on the specific dosing requirements, target area position, and machine cycle phase. This dynamic adjustment allows optimization of both dosing speed and accuracy for different operating conditions, achieving high productivity when needed while maintaining precision when required.
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
Enables precise dosing and application of small quantities of particulate material with high accuracy and efficiency, even for fine-grained materials, while reducing wear and overheating risks, suitable for high-speed manufacturing processes.
Implementation Method 1
the metering roller is controlled in a clocked manner, i.e., accelerated and decelerated according to the movement of the components being passed, so that with each clock cycle a number of cavities are brought into a dispensing position for the component that has just been passed and the particulate material contained therein is applied to the component
Implementation Method 2
the particulate material contained therein is dispensed with the assistance of gravity and/or centripetal accelerations of the metering roller
Data Source
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AI summary
The present invention relates to a method for dosing and applying a small quantity of a particulate material in a high-speed manufacturing machine for absorbent hygiene products, wherein components of the hygiene products to be manufactured are successively fed and conveyed in the manufacturing machine as the target structure for the particulate material to be applied, wherein a metering roller with cavities provided in its outer circumferential surface for receiving the particulate material is used, wherein the successively fed components are guided past and preferably below the metering roller and preferably at a distance from the metering roller, wherein the metering roller is controlled in a clocked manner, i.e., accelerated and decelerated according to the movement of the components being guided past it.so that with each cycle a number of cavities are brought into a dispensing position for the component just passed by and the particulate material contained therein is applied to the component, and wherein the metering roller is rotated by a rotation angle α of more than 30° and less than 120° per cycle.