FFS Machine Buffer Unit and Dual Transfer for Wear Reduction
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Solution Overview
Problem
Conventional form-fill-seal (FFS) machines have limitations in bagging capacity and suffer from high wear and vibrations due to the need to transport both empty and full bags at high speeds, resulting in reduced throughput and shorter machine lifespan.
Innovation Solution
The FFS machine is enhanced with a second transfer unit for simultaneous transfer of empty bags, allowing for reduced mass movement and increased efficiency, along with a buffer unit positioned between the supply unit and filling station, enabling effective welding seam cooling and duplication of filling stations to reduce cycle rates and extend machine life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the transfer unit transports both empty and filled bags at high speed, then the bagging throughput is improved, but the wear and vibration increase significantly
Solution Approach 1:
The patent divides the bag handling process into two separate transfer units: one dedicated to transporting empty bags and another for filled bags. This segmentation allows each transfer unit to be optimized for its specific function, with the empty bag transfer unit operating at higher speeds without suffering from the weight and vibration issues of transporting filled bags, thereby resolving the contradiction between throughput and machine wear
Solution Approach 2:
The patent implements different cycle rates for different filling positions, allowing dynamic adjustment of operational parameters. The first filling position operates at a higher cycle rate while the second operates at a lower cycle rate, enabling the system to maximize throughput while distributing wear across multiple stations and reducing overall mechanical stress
2Productivity
If a buffer unit is positioned downstream of the supply unit, then the transfer unit can operate continuously, but the transfer distance and required speed increase
Solution Approach 1:
The patent repositions the buffer unit to be located between the supply unit and the filling station rather than downstream, fundamentally changing the spatial arrangement. This dimensional reorganization creates a more efficient workflow where the buffer unit serves as an intermediate staging area, reducing the distance the transfer unit must travel while maintaining continuous operation capability
3Productivity
If multiple filling positions operate at the same high cycle rate, then the bagging capacity increases, but the machine wear and service life decrease
Solution Approach 1:
The patent implements dynamic cycle rate management where the first filling position operates at a higher cycle rate (e.g., 60 cycles per minute) while the second filling position operates at a lower cycle rate (e.g., 30 cycles per minute). This dynamic differentiation allows the system to maintain high overall bagging capacity while distributing mechanical wear across multiple stations and time periods, thereby extending machine service life
Data Source
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AI summary
The invention relates to an FFS machine for filling bags with bulk material, comprising a supply unit (2) for providing empty bags; a buffer unit (4) for buffering at least one provided empty bag; a first transfer unit (5) for transferring an empty bag from the supply unit to the buffer unit; a filling station (6) with at least two filling positions for filling one empty bag each; a second transfer unit (8) for simultaneously transferring at least two empty bags from the supply unit and/or the buffer unit to the at least two filling positions in the filling station; characterized in that the buffer unit is arranged between the supply unit and the filling station.