What are the most important considerations for a powder filling machine?

We're looking into purchasing an introductory machine, what are the most crucial things to keep in mind?
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Please see our website to see our 2 filling machines. Weigh Fill machines S-4 or S-5. 
John Simrose
[phone number]
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I have to correct a comment in the Kinnek response.  Kinnek indicates that auger fillers  "inconsistent powders of varying size and weight."  Auger Fillers can (and should!) be equipped with special features to compensate for products that have inconsistent particle sizes (for example some spice blends or soup bases) and   powders that vary in bulk density from batch to batch.  These special features include (but are not limited to) agitation system in the filler hopper, custom engineered auger tooling, custom hopper size and bulk feed systems.  Additionally auger fillers can be integrated with scales for fill-by-weight (gravimetric) or weight feedback operation.
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Fill accuracy.
Fill speed
Cleaning time.
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When considering the purchase of a powder filling machine, aside from production capacity, price, maintenance, and quality, you MUST consider the consistency/size/type of powders that you will be running through the machine.

There are three major kinds of powder filling machines: net weight fillers, auger fillers, and cup fillers.  While there are various price, production, and quality differences between these machines, they also differ with regard to how they process the powders.

Net weight fillers are excellent at handling a wide variety of powders, from fine-grained and consistent to powders of inconsistent size and weight (and even those that have a tendency to clump up).  Unfortunately, net weight fillers tend to be slower than auger and cup fillers.

Auger fillers are both cost effective and fast, but they are designed to handle fine powders.  They do not work well with inconsistent powders of varying size and weight.

Cup fillers are also fast, and are relatively low cost in comparison to both auger fillers and net weight fillers, but again, they are designed to handle fine powders.  Like auger fillers, they do not work well with inconsistent powders of varying size and weight.

Hope that helps!
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