Staggered Dump is used when product characteristics cause bridging in the transfer from the scale to the packaging machine. Staggered Dump applies a delay between the opening of the selected weigh buckets.
Our method is to use a settable and programmable total stagger time and divide that time by the number of weigh buckets. For example: If we program 500ms of total stagger time and five buckets are selected for a weighment, there would be 4 x 125ms of stagger between the bucket openings. Using the same 500ms on the next weighment, but with only three buckets chosen, the result is 2 x 250ms of stagger. (see graphs)
The Yamato Staggered Dump System has three important advantages:
- The total cycle time of the scale remains the same every cycle making the interface with the bagger more efficient.
- We automatically account for the fact that different amounts of product in different buckets require more or less stagger. For example, in the case above, when five buckets are selected each has approximately 20% of the total weight and we used 125ms of stagger. Compare that to three buckets each with 33% of the target weight and 250ms of stagger.
- Because we apply the stagger to any bucket chosen, we achieve better stagger performance resulting in less bridging and higher efficiencies.
Our superior control of Staggered Dump is extremely important in blending applications. We can control the distribution of components within the package by adjusting the stagger parameters for each component. This allows Yamato weighers to discharge a very homogeneous mix or, at the other extreme, layered components in the package.