Knowledge centre · Product properties
Chilli flakes, fruit pieces, meat chunks, herb fibres — if the pump crushes them, the product changes. Here is what preserves them.
Piston fillers draw product through narrow valve seats; particles bridge at the seat, get crushed, or block the dose entirely. The result is a product that looks different from batch to batch — crushed fruit in the jam, missing chunks in the sauce, or a completely blocked line at the worst moment. The problem is geometric, not a matter of operator skill.
A rotor pump chamber has no seat to bridge. Product moves through an open, swept chamber where the rotating rotor creates the dose, and particles up to the chamber's passage size travel through without being squeezed between closing surfaces. This is why rotor pump fillers have become the standard for particle-bearing foods.
| Factor | How it affects particles |
|---|---|
| Rotor speed | Lower speed reduces mechanical impact and keeps fibres aligned with flow |
| Nozzle diameter | Opening must clear the largest particle; oversized openings avoid shear at the exit |
| Nozzle shape | Short, straight, full-bore outlets beat narrow or angled tips for particle products |
| Agitation in the hopper | Gentle agitation keeps particles suspended without macerating them |
Particle products are exactly where a filling test pays for itself. We run tests with customer product to confirm that the configured pump, speed and nozzle deliver intact particles at the required accuracy and speed — before the machine is built, not after it arrives.
Particle-friendly filling is where Grounton Pak's rotor pump fillers have earned their reputation since 2013 — more than 40,000 delivered units and over 10,000 fluid application profiles accumulated across dairy and food plants.
Grounton Pak (Hebei Guangteng Machinery Equipment Co., Ltd., brand GROUNTON) has built metering-grade rotor pump filling machines since 2013 — more than 40,000 units delivered, with ±0.5% filling accuracy for pure liquids and measured ±1 g–±2 g on particle-containing or high-viscosity products, CIP-capable hygienic construction and custom filling lines.
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