Powder Flowability Data for a Filling Machine RFQ

Powder names are not enough to choose a dosing or filling route. Two powders in the same product category can behave differently because of particle size, moisture, bulk density, cohesion, aeration and storage history. This checklist helps a buyer describe the material before requesting a powder-filling quotation or arranging a sample test. It is a decision record, not a promise that any machine will handle every powder without configuration-specific evidence.

1. Identify the exact powder and sample status

Record the product name, internal code, grade, formulation status, batch or lot and date of sampling. State whether the sample is the intended production material, a laboratory substitute, a blended formulation or a development sample. If the formula may change, list the properties that are still open. A successful trial with a substitute should remain screening evidence until the production material is tested.

Define the decision stage: preliminary dosing-principle review, quotation, sample trial, factory acceptance or site validation. Name the target container or pouch, nominal fill, permitted tolerance and quality checks. The buyer’s qualified technical or quality reviewer should define any destination-specific release requirements.

2. Record particle size and shape

Provide the typical particle-size distribution and the maximum particles that may enter the product path. Include the measurement method, sample preparation and whether agglomerates were broken before measurement. Describe particle shape, surface roughness, friability, fibers, flakes or sharp fragments. A single average size hides the oversize material that may bridge at an outlet or restrict a narrow passage.

Record whether the distribution changes between lots. If sieving, screening or milling is part of the intended process, show where it occurs and which fraction reaches the filler. Do not infer dosing stability from a product photograph or a material name alone.

3. Measure bulk density with the state defined

Record loose bulk density and, where relevant, tapped or settled density. Note the container used, fill height, tapping method and conditioning time. State whether the powder is freshly blended, transported, vibrated or stored before measurement. A powder can occupy the same nominal volume while delivering a different mass after aeration or settling.

List the target fill by mass and the intended tolerance. If the buyer also needs a volume indication, keep that as a separate observation rather than substituting it for a mass requirement. The quotation should identify which density state was used for preliminary calculations and which values still require confirmation.

4. Describe flow, cohesion and bridging behavior

Describe whether the powder pours freely, forms a stable heap, clings to surfaces, rat-holes, bridges, floods or compacts under vibration. Record the test setup, humidity and storage condition. If a flowability index, angle of repose or shear-cell result is available, include the method and laboratory conditions; do not compare values from different methods as if they were identical.

Note whether gentle agitation, an agitator, a hopper insert or another anti-bridging measure is already used. The supplier should treat such measures as a configuration question, not an assumed standard. A short discharge from a clean container does not prove stable feeding over a full production run.

5. Capture moisture, humidity and temperature limits

Record moisture content, water activity if used by the buyer, ambient humidity and product temperature at sampling. Explain whether the powder absorbs moisture, cakes during storage or becomes dusty when dry. Include the storage packaging and the time between opening and testing. If the process requires a controlled environment, state who supplies and verifies that condition.

Keep safety and quality observations separate. Dust, combustible-dust concerns, allergens, active ingredients or respiratory hazards require the buyer’s qualified safety review and the destination site’s procedures. A generic machine description cannot establish hazardous-area suitability.

6. Describe dust, segregation and cleaning needs

Record visible dust, electrostatic behavior, segregation during conveying and any tendency for fine and coarse fractions to separate. State whether dust extraction, enclosure or a special transfer method is part of the intended line. Identify surfaces where powder accumulates and how the buyer expects them to be cleaned.

List allergens, colors, fragrances, active ingredients or other cross-contamination concerns. Provide approved cleaning agents, contact time and inspection method where known. For food-related projects, food-contact and cleanability questions should be reviewed against the buyer’s applicable process and destination requirements; a model code reference is not a machine certification.

7. Define the representative sample plan

Agree the quantity required for priming, adjustments, measured runs, rejects, cleaning observations and retained samples. Send more than one lot when lot variation is a purchasing concern. Label samples with product identity, lot, date, storage and safety information. Record any difference between the shipped sample and the material intended for production.

The test record should preserve feeder or hopper settings, product condition, observed interruptions, measured fills and rejected samples. Unknown values should remain marked for confirmation rather than being filled with catalogue assumptions.

8. Connect material data to the RFQ

Use the powder dosing material-data checklist to organize the basic inputs, then state which values are measured, estimated or open. If the package is a premade pouch, compare the packaging route with the VFFS versus premade-pouch guide. For a broader line scope, use the compact packaging-line RFQ checklist.

Send the powder data and sample plan to MUJIU. A useful RFQ makes uncertainty visible, so the supplier can propose a test boundary and the buyer can compare like-for-like quotations.

Minimum powder data to submit

• Product identity, lot, formula status and storage condition.
• Particle-size method, distribution, shape and oversize fraction.
• Loose and settled bulk density with measurement conditions.
• Flow, cohesion, bridging, flooding and anti-bridging observations.
• Moisture, humidity, temperature, dust and safety inputs.
• Fill mass, tolerance, package, sample quantity and acceptance checks.