Protein powder filling machine: key insights in 30 secondss
Technical summary:
Proteins are intended for human nutrition. They are most often packaged as powder, but they can also exist in micro-granulated form. They are most commonly packaged in jars and pouches, and more rarely in bags up to 10 kg or 25 kg. Depending on their origin and formulation, proteins can have different physical and chemical properties.
Vertical auger dosing is the appropriate technology for packaging powders and micro-granules such as proteins.
This article summarizes the constraints to anticipate before investing in a protein filling machine, as well as best practices for choosing the dosing technology, product feeding, and dosing tooling.
Protein powders: a wide range of types
Plant proteins vs animal proteins
A whey protein, a casein, and a plant protein (pea/rice/soy) do not behave the same way. Even with the same name, powders from two different suppliers can differ. These differences come from density, particle size distribution, and flow behavior.
In practice, a plain whey protein powder may have a density of 0.54, while a whey protein from the same supplier, vanilla flavored, can have a density of 0.42.
Proteins and blends
Proteins are often blended with other ingredients (flavors, vitamins, sweeteners, creatine, etc.). Sometimes a single additive is enough to make the powder stickier, dustier, or less stable. This is why dry protein formulations often have very different physical and chemical characteristics from one recipe to another.
Powder vs micro-granulated: what the form really changes
A micro-granulated protein flows more easily. It may be less dusty than a very fine powder. Conversely, a fine powder may offer other benefits but can create cleanliness constraints during dosing.
Which packaging formats are proteins packed in?
Proteins in jars
When proteins are packaged in jars, the dose typically ranges from 100 g to 2 kg. Jars are often plastic, rarely glass. Some jars can build up static electricity before filling; in that case, it is sensible to discharge the jar before filling the protein.
Proteins in pouches
Proteins are also found in pouches. Flat-bottom pouches represent a significant share of protein packaging. Doses range from 100 g to 1 kg. Avoid powder in the sealing area. To do so, the dosing tooling must enter the pouch during filling.
Proteins in bags
B2B protein suppliers sell large-volume formats, mostly bags in 20 kg and 25 kg sizes. Proteins are often less blended in these formats. The B2C customer may create blends to meet specific needs.
Which protein powder filling machine?
Protein characteristics
Protein products are typically supplied either as fine powders or micro-granules. In powder form, proteins can be more or less dusty. Proteins can be moderately to very sticky. Finally, some protein powders tend to form lumps, which can be several centimeters across.
Goal: clean and accurate dosing
Vibratory trough dosing generates a lot of fines, especially with dusty proteins.
Horizontal dosing is mainly used in process applications (big bags). For smaller doses, it will be very inaccurate.
Vertical auger dosing accurately doses both powder and micro-granules.
That is why it is the appropriate dosing technology for packaging proteins.
How to feed product
Keeping a constant product level in the hopper helps maximize dosing accuracy. For protein packaging, the choice of feeding technology depends on workshop organization. If proteins arrive at the same level as the doser, pneumatic conveying is effective. If proteins arrive from an upper floor, prefer gravity feeding.
Trials and validation for a protein powder filling machine: what you must check
To secure your protein filling project, the most reliable approach is validation under real conditions: request to take part in tests with your proteins in your packaging.
These tests allow you to verify:
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dosing accuracy
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repeatability (standard deviation)
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throughput
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dosing cleanliness (no “drip” at end of dosing)
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level of dust/fines
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simplicity and speed of disassembly for cleaning
MOM Packaging has manufactured protein powder filling machines for many customers.
Since 1927, MOM Packaging has been designing dosing and filling machines, with historical expertise in powder packaging.
Conclusion
To fill protein in dry form, whether dusty, sticky powder or micro-granules, vertical auger dosing is generally the most suitable technology. This should always be confirmed through trials. To achieve clean and accurate dosing of dry protein products, the machine builder will determine suitable dosing tooling.
Do you have other questions about powders? Read our complete guide to powder filling.