Frequently asked questions
There are many questions raised when it comes to auger filling. For your convenience, we have answered the most common below. Simply click on the question to display the answer.
Whether live weighing directly on a weigh-cell (gravimetric), upstream/downstream weighing, multi-stage weighing, multi-speed weighing, check weighing with feedback, the most appropriate is dependent upon the application. See our Technology Page for further details.
No. Correct design of the auger/funnel and adequate residence time within the hopper ensures a clean cut-off of semi-free-flowing and non-free-flowing powders. Our free-flow tooling features a spinner disc to ensure clean cut-off. See our Technology Page for further details.
This is dependent upon the flow and dusting characteristics of the powder. Typically, to achieve a reasonable accuracy without too much dust generation 1-2 kilos per second would be a normal maximum. In terms of containers per minute, speeds up to 400CPM are filled on our continuous motion rotary fillers. See our Technology Page for further details.
Wholly dependent upon the number and types of powders to be filled and the range of fill weights. Most ranges of powders fall into two categories; free-flowing and non-free-flowing, with a few intermediate semi-free-flowing, e.g. a normal range of spices would require two auger/funnel set types, possibly three. See Technology Page for further details.
We would normally recommend a ratio of 5:1 to ensure that neither the accuracy of the smallest fill or speed of the largest fill is compromised.
The Series 10 can fill from 50mg to 25 kilos (and more). See Products Pages for other models.
Dependent upon the product, the fill weight, speed and the price one is prepared to pay for high accuracy. The micro-filler can fill ± 1mg on dose sizes up to 1g. With multi-stage filling, the Series 10 Gravimetric filler can fill 10kg to within 1g.
For powders of inconsistent bulk density, where high accuracy is required or where validation of the fill weight is needed. See our Technology Page for further details.
Accuracy is dependent upon many factors including powder characteristics, fill size, tooling size, speed, bulk feed system etc. Typically, we might expect ± 1% volumetrically, a little better for easy products, a little worse for more difficult ones.
The most frequently used methods are by hand via scoop, by gravity from overhead bulk bin (if product is free-flowing), via horizontal auger hopper feeder from overhead bulk bin (if non-free-flowing), by vacuum system from floor level drums or via inclined spiral/screw for easy-flow non-aerating products.
We consider it essential that the correct agitation mode is chosen for each powder/type/application which can only be achieved with completely independent auger and agitation drives. See our Technology Page for further details.
For most standard applications, flux vector inverter drive for variable speed versatility. For high torque applications, self-adjusting electro-magnetic clutch/brake. For high speed, high accuracy, high torque applications, servo drive. See our Technology Page for further details.
The hopper is supported from a heavy duty casting via two stainless steel dowels and stainless steel lined dowel holes (not via the lid). Concentricity is therefore always guaranteed.
The auger/funnel can be removed in c.30 seconds and re-fitted in similar time by an operator without tools. Hopper removal and replacement each take c. 2 minutes. A standard dry brush/cloth clean down of hopper, lid, auger drive shaft and agitation blade might take a couple of minutes. Allow 5-10 minutes total.
Whenever it is important to maximise residence time of the powder within the hopper, i.e.:
• When fill weights are over 500g
• Powder having a tendency to aerate
• Bulk feed system which might tend to aerate the powder
• Applications where accuracy is critical and therefore consistent powder bulk density is essential.
80, 100, 120 and 400 litre hoppers are also available. Hoppers smaller than 38 litres, however, should not be used for anything other than micro/macro dosing (see Series 1 Micro-Filler and Series 5 Mini-Filler).