Clocked Cavity Metering Roller for Small Particulate Doses
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing methods and devices for applying superabsorbent particulate material in hygiene products are inadequate for precise application of small quantities, particularly less than 2.0 g, due to non-constant application and unsatisfactory distribution, especially with fine-grained or powdered materials.
Innovation Solution
A metering roller is controlled in a clocked manner, accelerating and decelerating with each cycle to bring cavities into dispensing position, ensuring precise application of particulate material by gravity and centripetal acceleration, with a guide arrangement to direct the material accurately.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional continuous metering rollers are used, then large quantities of particulate material can be applied, but precise dosing of small quantities cannot be achieved
Solution Approach 1:
The metering roller is divided into multiple discrete cavities around its circumference, each cavity acting as an independent dosing unit. This segmentation allows precise control of small quantities by selecting which cavities are filled and discharged, enabling accurate dosing of particulate material in small amounts while maintaining the capability to apply larger quantities by filling multiple cavities.
2Manufacturing precision
If metering rollers operate at constant speed, then continuous application is achieved, but precise timing and positioning cannot be controlled
Solution Approach 1:
The metering roller transitions from constant speed operation to variable speed operation with clocked acceleration and deceleration cycles. The roller accelerates to bring filled cavities into the discharge position, then decelerates to allow complete emptying of the cavities. This dynamic speed control enables precise positioning of cavities relative to the target structure while maintaining accurate dosing timing.
3Adaptability or versatility
If a single metering roller is used, then device simplicity is maintained, but adaptability to different application requirements is limited
Solution Approach 1:
A single metering roller is designed with multiple cavities that can be selectively filled and discharged to accommodate different dosing requirements. The same roller can apply varying quantities of material by controlling which cavities are filled, enabling one device to perform multiple dosing functions rather than requiring separate rollers for different application scenarios.
4Adaptability or versatility
If particulate material with less than optimal flowability is used, then material versatility increases, but dosing accuracy decreases
Solution Approach 1:
The clocked acceleration and deceleration of the metering roller creates dynamic forces that effectively discharge particulate material even when flowability is suboptimal. The repeated acceleration cycles generate sufficient force to overcome material cohesion and ensure complete emptying of cavities, maintaining dosing accuracy for materials with varying flow characteristics.
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 application of small quantities of particulate material, even with less than optimal flowability, supporting high-speed manufacturing with minimal residue and varying application amounts without requiring multiple rollers.
Implementation Method 1
the particulate material contained therein is discharged with the aid of gravity and/or centripetal accelerations of the metering roller
Implementation Method 2
the particulate material contained therein is discharged with the aid of gravity and/or centripetal accelerations of the metering roller
Data Source
Figure 1
Figure 2
Figure 3
AI summary
The invention relates to a method for dosing and applying a small quantity of a particulate material in a high-speed manufacturing machine (4) for absorbent hygiene products, wherein components (14) of the hygiene products to be manufactured are successively fed and conveyed in the manufacturing machine (4) as a target structure (16) for the particulate material to be applied, wherein a metering roller (20) with cavities (28) provided in its outer circumferential surface (22) for receiving the particulate material is used, wherein the successively fed components (14) are guided past and preferably below the metering roller (20) and preferably at a distance from the metering roller (20);According to the invention, it is proposed that the metering roller (20) is controlled in a clocked manner, i.e., accelerated and decelerated according to the movement of the components (14) being passed by, so that with each clock cycle a number of cavities (28) are brought into a dispensing position (40) towards the component (14) that has just been passed by and the particulate material contained therein is applied to the component (14).