A practical guide to matching the screw, tube and outlet to the powder, dose and pack.
The auger screw, surrounding tube and outlet are chosen together for the powder, target fill range and pack opening. Screw diameter and pitch influence displaced volume; clearances, outlet geometry and release behaviour influence charging, cut-off and free fall. Product trials confirm whether the set is appropriate.
A project may need more than one tooling set when the fill range is too broad for one configuration or when products behave materially differently.
Identify every auger, tube, outlet, seal and recipe as a controlled set so changeover and troubleshooting remain traceable.
Flow, density, particle size, dust, cohesion and sensitivity.
Smallest, typical and largest target with acceptance method.
Opening, height, support, headspace and sensitive seal or rim areas.
Machine route, output, cleaning, changeover and product feed.
The target range influences the volume that must be displaced per revolution and the practical number and speed of revolutions per dose. Very small and much larger fills may need different screw and tube sets so each target can be reached without an unsuitable dosing movement.
Trial the smallest and largest required fills rather than assuming a single setting covers the full commercial range.
Direct link to answerA very free-flowing powder may continue moving after the auger stops if the outlet does not control the product column. Outlet and cut-off design therefore affect dribble, flooding, dust and pack contamination, while the opening must still suit the production pack.
Observe the end of dose, the first fill after a stop and the behaviour at different hopper levels.
Direct link to answerMultiple tooling sets may be needed for widely separated fill ranges, different pack openings, products with materially different flow or release behaviour, or changeover policies that require dedicated contact parts. The decision should follow trials and a product-to-pack change matrix.
Each set should be labelled, stored and linked to its approved recipe and assembly instructions.
Direct link to answerAfter a tooling change, confirm correct parts, assembly, clearances, recipe, first-off result and any required restart or purge sequence. Do not rely on the recipe name alone.
Compare the current set with the controlled identification and condition record before compensating for suspected wear by changing recipe values.
Lancing can use representative samples to identify whether one or more tooling sets should be tested.