Review ingredient distribution through transfer, hopper refill and dosing—not only the finished-pack weight.
Powder blend segregation is the separation of ingredients during handling or discharge. An auger filler can deliver the correct total mass while the proportions of fine and coarse ingredients change between packs. Assess the transfer route, hopper flow, agitation and discharge sequence alongside fill weight; the filling screw is a dosing device, not evidence that a blend remains uniform.
This guide concerns premixed powders entering a stand-alone or automatic auger filler. It is not a mixer specification or a promise that any filler can restore an out-of-specification blend. Ingredient distribution should be checked by the product owner using a sampling and analytical method appropriate to the formulation.
Identify the supply hopper, transfer stage, filling hopper and discharge point when recording samples. This existing Lancing image illustrates an equipment arrangement; it is not evidence of a tested blend or a uniformity result.
| Observed situation | Possible mechanism | Evidence to collect |
|---|---|---|
| Fine and coarse fractions appear at different points in the batch | Smaller particles may pass through the gaps between larger particles as the bed moves. A heap formed during refill can distribute fractions unevenly. | Record the transfer drop, filling position, batch sequence and whether the appearance or composition changes after refill. |
| Fine powder behaves differently after pneumatic transfer | Air retained in fine fractions can change how components settle or discharge. Consistent total density alone does not prove consistent composition. | Keep receiver discharge, waiting time and refill events attached to each sample record. |
| The centre of the hopper empties while material remains near the wall | Preferential flow can discharge different parts of a previously segregated bed at different times. | Observe the flow pattern through approved access arrangements; record end-of-batch material separately. |
| The blend changes after prolonged agitation or vibration | Additional particle movement can alter ingredient distribution or break fragile agglomerates; the effect depends on the material. | Compare the approved agitation condition with the proposed setting and retain samples before and after handling. |
These are investigation prompts, not diagnoses from appearance alone. Jenike & Johanson’s segregation guidance explains the underlying particle-separation mechanisms. The appropriate remedy depends on the actual blend and equipment.
Use the existing bulk-density and flowability test to describe the physical state, but keep that evidence separate from a composition test. Factory acceptance testing should state which tests are witnessed and which product-quality decisions remain with the buyer.
A larger hopper may reduce refill frequency but can also change residence time and the way a bed empties. A different transfer route may reduce open handling while introducing a different aeration or discharge condition. Neither change should be sold as a universal cure for segregation.
Ask for the proposed product path to be marked on the layout: source container, transfer receiver, hopper, agitator, auger and outlet. State how the last part of a batch is handled and whether topping up from a new batch is permitted by the quality procedure. For a contract packer, include the range of blends and the cleaning requirements between them.
The first-party LU-FM100B model page provides a compact trial route to discuss, while automatic auger filling introduces conveyor and multi-station conditions. Neither route should be taken as proof of blend uniformity without application evidence.
A checkweigher measures pack mass, not the proportion of each ingredient. Two packs can weigh the same while containing different ingredient distributions. A checkweigher remains useful for weight control, but blend uniformity requires the product-specific sampling and analysis agreed by the buyer’s quality team.
A faster agitator is not a validated reblending process. It may help feed some powders, but additional movement can also change segregation, compaction or fragile-particle damage. Use the manufacturer’s approved settings and test ingredient distribution as well as dose weight before adopting a change.
End-of-batch packs show how the remaining material leaves the hopper when the level is low. They may reveal a change that an average across the whole run hides. Keep them identified, then assess weight and composition against the same acceptance method as the rest of the batch.
A satisfactory mixer sample proves only the material sampled at that stage. Transfer, waiting, refill and hopper discharge occur afterwards and can change a susceptible blend. Include the actual handling sequence and filled-pack evidence before approving the complete process.
Describe the relevant differences between ingredients, known separation or agglomerate problems, incoming batch condition, fill range, pack opening and required output. Include the transfer method, a representative sample, a sketch of the product path and the quality test you need to satisfy. Ingredient percentages or other confidential details should be shared only through the appropriate agreed process.
For safe sampling and intervention, use the site’s approved isolation, dust-control and access procedures. Do not reach into moving equipment or alter guards to observe flow. See powder-dust risk and extraction checks and HSE machinery-maintenance guidance.
Send the blend-handling observations, pack details and acceptance method so the auger-filling route can be reviewed against the complete production task.