Premix Feed Packing Equipment in Switzerland

Why Premix Packing Needs Different Equipment from Pellet Feed Bagging

Premix does not behave like dry feed pellets.

Pellets generally flow freely through gravity-fed weighing equipment. Fine mineral and vitamin premixes can have lower and more variable flowability, generate substantially more dust and contain components with very different particle size and bulk density.

This creates a different bagging problem.

The packing machine needs to meter powder accurately as the target weight approaches without allowing large quantities of material to continue falling after the weighing system reaches its cut-off point.

It also needs to minimize uncontrolled dust release around the filling spout.

The Swiss customer packages relatively high-value feed premixes, so repeatable weight control is commercially important. However, the machine is not selected on the assumption that every gram above the nominal weight represents a fixed financial loss or that every gram below it automatically changes the nutritional composition of the farmer’s complete feed.

The premix producer manages package weight according to its own declared quantity, internal quality system and applicable metrological requirements.

RICHI’s job is to configure a weighing and filling system that can be calibrated with the actual powder.

DCS-50FB Selected for Fine Premix Powder

The reference accuracy figures need to be interpreted correctly.

For a 25 kg bag, ±0.1% corresponds to approximately ±25 g, while ±0.2% corresponds to approximately ±50 g.

These are reference performance levels, not a guarantee that every production bag will remain within ±8 g or ±10 g.

Actual dynamic accuracy depends on powder flowability, bulk density, auger cut-off behavior, scale calibration, vibration, filling speed and the amount of material still moving between the feeder and the weighing container at the cut-off point.

That is why commissioning uses the customer’s real premix rather than certified test weights alone.

Auger Feeding Gives Better Control of Fine Powder Flow

The main reason for choosing an auger-fed model is the physical behavior of premix powder.

A gravity feeder depends on material falling consistently under its own weight.

That can work very well with pellets and some free-flowing granules, but a fine premix can bridge, aerate or change flow rate as hopper level changes.

An auger provides positive mechanical feeding.

Feed rate can be controlled as the weighing cycle progresses, allowing the machine to use a faster filling stage followed by a slower final-feed stage as it approaches the target weight.

This improves the ability to control overshoot.

However, the auger should not be described as eliminating dust completely.

Fine premix powder can still become airborne at product transfer points, during bag attachment and when the filled bag leaves the spout.

Dust collection and extraction around the filling station therefore remain important parts of the installation.

The upstream hopper also needs enough geometry and agitation or flow assistance where necessary to keep the premix moving consistently toward the auger.

Premix Composition Changes Packing Behavior

The customer produces dairy-feed vitamin and mineral premixes containing several categories of ingredients.

These can include mineral sources, vitamin preparations, carriers and low-inclusion feed additives according to the product specification.

The exact formulation is not fixed in the equipment case because different premix SKUs can have very different physical behavior.

A product containing a high proportion of dense mineral material can have a much higher bulk density than a carrier-rich vitamin premix.

Fine calcium or phosphate materials can also behave differently from coarser carrier particles.

These differences affect auger load, hopper flow, filling speed and the amount of material required to fill a 25 kg bag.

The customer therefore stores separate packing parameters for representative product groups rather than assuming one feeder speed will suit every formula.

If a new premix has a substantially different density or flow characteristic, the operator rechecks dynamic bagging performance before full production.

Stainless Steel Is Selected Around Product Contact and Cleanability

Stainless steel is useful in premix packing because the customer requires product-contact surfaces that are durable, cleanable and suitable for repeated formula changes.

However, it is too broad to state that every mineral ingredient will rapidly corrode mild steel or that stainless steel automatically makes a premix line safe.

Corrosion behavior depends on the specific compound, concentration, moisture, ambient humidity, cleaning chemicals and contact time.

Dry mineral powders can also be abrasive without necessarily being strongly corrosive.

For the Swiss project, stainless steel is therefore selected primarily for the product-contact areas where cleanability, surface condition and contamination control are important.

The exact stainless grade and extent of stainless construction should be confirmed from the delivered machine configuration rather than assuming that every structural member, valve and platform is automatically 304 stainless steel.

Cleaning design matters just as much as material selection.

Powder trapped behind augers, inside dead zones or around the filling spout can enter the next production batch even when all visible surfaces are stainless.

RICHI therefore evaluates access to the auger, hopper and discharge zone as part of the premix application.

Cross-Contamination Control Is a Process Requirement

A specialty premix plant may produce several formulations with different trace-mineral, vitamin or additive profiles.

Carryover between those products has to be controlled through the manufacturer’s own feed-safety and quality system.

The automatic packing machine is one of the final places where residue can remain after a production run.

The customer therefore establishes a documented changeover procedure based on the risk associated with the products being packed.

The procedure can include:

1. stop material supply and empty the hopper and auger as completely as practical;
2. remove accessible residual powder by an approved dry-cleaning method;
3. inspect the auger, hopper, weighing section and filling spout for retained material;
4. clean product-contact surfaces according to the plant’s validated procedure;
5. verify that the equipment is dry and ready before the next premix enters;
6. record the changeover where the customer’s quality system requires traceability.

The exact method depends on the product.

It is not appropriate to prescribe a fixed 25-minute cleaning cycle or to require wet sanitizing and rinsing after every premix because introducing water into a dry powder line can itself create additional problems if it is not completely removed.

Some changeovers can be managed with validated dry cleaning, while higher-risk product transitions may require a more intensive procedure.

Dynamic Calibration Uses the Actual Premix

Static calibration with certified test weights confirms the weighing system itself, but it does not capture all of the effects that occur while powder is moving through the auger.

For that reason, dynamic commissioning uses actual premix.

The machine fills representative bags, and the customer verifies them on an appropriate reference scale.

The operator then adjusts the coarse-feed and fine-feed transition, auger speed or other permitted filling parameters according to the observed weight distribution.

Several consecutive bags should be checked rather than judging the machine from one fill.

The objective is to understand average fill weight and variability around that average.

If bags trend consistently heavy, the operator investigates the target setting and cut-off behavior.

If variability is large in both directions, the problem may involve inconsistent powder flow, changing hopper head, vibration or material aeration rather than one simple weight offset.

This process is more defensible than claiming that one hundred bags were all within ±12 g without retained commissioning data.

Bag Construction Determines the Closing System

The Swiss customer uses approximately 25 kg bags for concentrated premix.

Where the package includes an inner polymer liner, the liner can be sealed to improve protection from external moisture before the outer bag is closed.

The exact closing method depends on the supplied bag construction.

A multiwall paper bag with a separate liner may require a different sequence from a laminated open-mouth bag or another barrier package.

This means “heat seal plus sewing” is not automatically mandatory for all premix products.

The customer first defines the moisture-barrier requirement, bag material, transport conditions and warehouse environment.

RICHI then matches the bag-handling and closing equipment to that package.

Heat-seal temperature and dwell time are also determined from the actual liner film.

They should not be maintained according to one generic temperature or checked with a fixed weekly routine supplied by the packing-machine manufacturer.

Seal integrity belongs to the customer’s packaging quality-control program.

5,000 T/Y Requires a Real Bag-Throughput Calculation

The plant produces approximately 5,000 tonnes of premix annually, but the bagging-machine requirement depends on how much of that volume is actually packed in 25 kg bags and the available production hours.

If all 5,000 tonnes were packed at 25 kg, the annual quantity would be approximately 200,000 bags.

At 300 production days per year, that averages roughly 667 bags per day.

If the packing section operates eight hours per day, the simple average requirement is only about 1.4 bags per minute before allowing for SKU changes, cleaning, calibration, pallet changes and peak production periods.

This calculation is important because a premix packer should not be selected merely from the largest possible bags-per-minute number.

Accuracy, dust control and changeover time can be more important than maximum mechanical speed.

The customer may also operate concentrated production campaigns where several days of premix are packed in a shorter window.

RICHI Machinery therefore asks for peak bags per hour rather than annual tonnage alone.

Premix Feed Packing Equipment in Switzerland

This premix feed packing equipment in Switzerland project uses one RICHI DCS-50FB auger-fed weighing and filling machine in an established specialty premix facility in central Switzerland.

The equipment handles fine vitamin-mineral dairy feed premix packed primarily in approximately 25 kg bags.

The auger feeding arrangement is selected because controlled mechanical dosing is better suited to this fine powder than a simple free-fall system.

Stainless-steel product-contact surfaces support cleanability and repeated batch changeovers, while the surrounding dust-extraction system controls airborne powder released during filling and bag handling.

The reference static and dynamic weighing accuracies are treated as machine-selection values rather than guaranteed results for every formula.

For a 25 kg package, ±0.1% corresponds to approximately ±25 g and ±0.2% to approximately ±50 g. Actual production accuracy is verified with the customer’s real product during dynamic commissioning.

Product purity also depends on more than stainless steel.

The Swiss manufacturer combines appropriate contact materials with documented cleaning, changeover control, ingredient traceability and its own feed-safety quality procedures.

The packing machine supports that system but does not independently eliminate contamination risk.

For another buyer searching for premix feed packing equipment in Switzerland, premix packing machine, vitamin mineral premix bagger, auger feed packing machine, 25 kg premix bagging equipment, stainless steel feed packing machine or DCS-50FB premix packer, RICHI first evaluates the physical behavior of the powder.

Useful project data include bulk density, particle-size distribution, flowability, dust level, target bag weight, required bags per hour, product-contact material requirement, bag construction, liner type, closing method, number of premix SKUs, changeover frequency, available dust collection, compressed-air conditions and the accuracy target used by the plant’s quality system.

If the product is a free-flowing pellet or granule, an auger feeder may be unnecessary.

If the product is a very fine premix with variable flow behavior, controlled screw feeding can provide a stronger basis for stable filling.

If the premix feed plant produces formulas requiring strict carryover control, RICHI also reviews cleaning access and residual-material points before confirming the packing configuration.

For a Swiss premix packing project, send RICHI representative product data or samples, bulk density, bag weight, peak bags per hour, dust-control requirements, bag material, liner design and cleaning/changeover procedure. These parameters allow the packing equipment to be configured around the real premix rather than relying only on a theoretical accuracy specification.