Dosing Unit Rotary Fluid Distributor Nozzle Synchronization
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Solution Overview
Problem
Existing methods for producing detergent pods face limitations in filling speed and precision due to nozzle reversal issues, which can lead to air entry and contamination, and require complex feeding systems for continuous motion processes.
Innovation Solution
A dosing unit with a closed-loop guide path and movable elements that synchronize nozzle movement with a rotating wheel, using a cam-driven plunger system to ensure precise fluid delivery without air entry, and a rotary fluid distributor for efficient and precise dosing of fluid compositions into water-soluble film cavities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If nozzles move continuously with cavities on an endless surface, then filling efficiency is improved, but air entry and contamination occur due to nozzle motion reversal
Solution Approach 1:
The continuous nozzle movement path is segmented into distinct phases: a filling phase where the nozzle moves with the cavities in the machine direction, and a retraction phase where the nozzle returns to the start position. This segmentation allows the system to achieve continuous filling efficiency while controlling air entry by separating the filling action from the retraction action, preventing harmful contamination during the critical filling process.
Solution Approach 2:
The system performs preliminary positioning of the nozzle at the start position before each filling sequence. The nozzle is positioned in advance, then moves with the cavities during the filling phase, and only after filling is complete does it retract to the start position. This preliminary positioning action ensures that the nozzle is ready for precise filling while minimizing air entry during the actual dosing process.
2Manufacturing precision
If nozzles reciprocate to fill cavities, then filling precision is maintained, but production speed is limited by the return motion time
Solution Approach 1:
The system employs dynamic movement of the nozzle through a cam mechanism that synchronizes nozzle position with cavity position. The nozzle moves dynamically along with the cavities during the filling phase, maintaining precise alignment for accurate dosing. After filling, the nozzle rapidly retracts to the start position, creating a dynamic cycle that optimizes both precision and speed by adapting the nozzle motion to the operational requirements at each stage.
Solution Approach 2:
The nozzle operates in a periodic reciprocating cycle: moving with cavities during the filling phase, then returning to the start position. This periodic action allows the system to maintain filling precision during the productive filling phase while the return motion to the start position prepares the nozzle for the next cycle. The periodic nature of this action optimizes the balance between precision and speed by ensuring the nozzle is positioned correctly for each filling operation.
3Productivity
If a rotating nozzle system is used for continuous dispensing, then filling speed increases, but the feeding system becomes complex and dosing repeatability is compromised
Solution Approach 1:
The cam mechanism acts as an intermediary element between the continuous web movement and the nozzle reciprocating motion. The cam converts the continuous linear motion of the web into the appropriate nozzle movement pattern, simplifying the feeding system while maintaining dosing repeatability. This intermediary mechanism avoids the need for complex rotating nozzle systems, achieving continuous dispensing speed through a simpler, more reliable mechanical interaction.
4Ease of operation
If the nozzle returns to the start position after filling, then the system is ready for the next cavity, but time is lost during the return motion
Solution Approach 1:
The system maintains continuity of useful action by having the nozzle move with the cavities during the filling phase, eliminating idle time during the productive dosing operation. After filling, the nozzle rapidly retracts to the start position, minimizing the time loss during the non-productive return motion. The cam mechanism is designed to optimize this return motion, making it as short and efficient as possible while still achieving the necessary positioning for the next filling cycle.
Data Source
AI summary
A dosing unit for a machine for producing unit dose articles includes a plurality of nozzles carried by respective movable elements and associated to respective dosing chambers, a plurality of plungers reciprocally movable into respective dosing chambers between respective retracted and advanced positions, and a rotary fluid distributor including at least one stationary inlet and a plurality of movable outlets fluidically connected to the respective dosing chambers.