Today we’d like to illustrate the great advantages EasyWeigh® system involves concerning the far inferior spacing needed between products running on checkweigher’s conveyors.
Reduced products spacing needs
EasyWeigh® system, thanks to its accuracy, allows to get the best performances in a reduced weighing time: that means a smaller gap required between products.
For a correct weighing, only one product has to be on the weighing conveyor at a time.
Line spacing between products can be considered as “gap” or “pitch” (see Fig. 3):
- “Gap” is the space between the rear of a product and the front of the following one;
- “Pitch” is the distance measured from the front of a product and the front of the following one.
Fig. 3: Gap and Pitch definition
“Peak weight” checkweighers need a GAP between products a little greater than the weighing conveyor length (for each product, measurement sampling stops when a photocell detects the products is over the weighing conveyor).
On the contrary, EasyWeigh® checkweighers just need the PITCH between two products to be a little greater than the weighing conveyor length (a shorter sampling time being needed, once the front of a product reach the photocell at the end of the weighing conveyor, the system detects it as “weighing completed”, so the following products can enter the weighing conveyor without the previous one altering its measurement).
The advantages in terms of spacing are clearly explained in the following Fig. 4.
Fig. 4: Example of spacing needs for EasyWeigh® and “Peak weight” technologies
As a result, for a determined line throughput, EasyWeigh® technology allows to use a shorter weighing conveyor, meaning an inferior conveyor speed required. This implies not only a concrete advantage in terms of durability (thanks to the reduced wearing out of the components) but also a greater accuracy.
Two basic examples can help to understand this advantages.
Assume 100 x 250 mm products, with a line throughput of 60 pieces / min and a weighing conveyor length of 315 mm:
- With a “peak weight” technology the conveyor running speed needs to be equal to 35 m/s
- With EasyWeigh® technology it’s sufficient to keep a conveyor running speed equal to 20 m/s
Assume 100 x 250 mm products, with a line throughput of 60 pieces / min, to reach the proper weighing time of a product:
- With a “peak weight” technology the conveyor length has to be equal to 415 mm, having the scale conveyor running at a speed of 26 m/s
- With EasyWeigh® technology the conveyor length has to be equal to 315 mm, having the scale conveyor running at a speed of 20 m/s
Tomorrow we’ll conclude our EasyWeigh® insight, talking about the green features of this technology. See you tomorrow!