What Is a Granulator (制粒机) and How Do You Choose the Right Type for Powder Processing?

Updated 2026-09-27

A granulator (制粒机) converts powders or fine particles into granules with a defined shape and size. You choose the type based on your feed material, whether you can use moisture or a binder, your target granule size, and how the granulator fits with your mixing, drying, and screening steps. The five families below cover most pharmaceutical, food, and chemical powder-processing lines.

What Granulation Actually Does

Granulation solves problems that raw powders create: dust, poor flow, segregation of mixed ingredients, and low bulk density. By binding particles into larger, more uniform granules, you get a material that flows predictably, compresses or fills more evenly, and stays homogeneous during handling.

Two broad routes exist:

Wet granulation — adds liquid (water, solvent, or binder solution), forms granules, then dries them.
Dry granulation — uses mechanical force (compaction) with no liquid, suitable for moisture-sensitive or heat-sensitive materials.

The Main Granulator Types

The product range on hongdamach.com lists five granulator families. Each suits a different feed form and process stage.

Type	Model series	How it works	Typical fit
Swing granulator	YK series	Oscillating rotor pushes wet mass through a screen	Wet mass from a mixer; simple, low-throughput granulation
Dry granulator	GK series	Compacts powder into sheets or flakes, then breaks them down	Moisture- or heat-sensitive materials; no drying step needed
High-efficiency wet mixing granulator	GHL series	Mixes and granulates in one vessel with a high-shear impeller	One-step wet granulation; dense, uniform granules
Rotary granulator	ZL series	Rotating cylinder/screen forms granules from moist powder	Continuous or larger-batch wet granulation
Quick sizing granulator	KZL series	Breaks wet or dry cakes into uniform granules	Sizing after wet granulation or drying; de-lumping

Swing Granulator (YK Series)

Best when you already have a moist, cohesive mass and want a simple, low-cost way to form granules. The oscillating rotor forces the mass through a screen, so granule size is set mainly by the screen aperture. It is a good entry point for small batches, but throughput is limited and it is not ideal for free-flowing dry powders.

Dry Granulator (GK Series)

Choose this when your material cannot tolerate moisture or heat. The powder is compacted between rollers into a sheet or flake, which is then milled into granules. No drying is required, which shortens the line and avoids a thermal step. The trade-off is that granules tend to be denser and less spherical than wet-granulated ones.

High-Efficiency Wet Mixing Granulator (GHL Series)

This combines mixing and granulation in a single closed vessel using a high-shear impeller (often with a chopper). It produces dense, uniform granules and reduces material handling between steps. It suits formulations where a binder solution is added and a compact, well-bound granule is wanted. Because it is a closed process, it also helps with containment.

Rotary Granulator (ZL Series)

A rotating action forms granules from moist powder, and it can run more continuously than a swing granulator. It fits lines where you want steady output of wet granules before drying.

Quick Sizing Granulator (KZL Series)

This is a sizing and de-lumping machine rather than a primary granulator. It takes wet or dry cakes and breaks them into uniform granules. Use it after wet granulation or after drying to tighten the particle-size distribution.

How to Match the Type to Your Process

Work through these questions in order:

Can the material take moisture or heat? If no, start with the GK dry granulator. If yes, wet granulation (YK, GHL, ZL) is open to you.
Do you need mixing and granulation in one step? The GHL high-efficiency wet mixing granulator does both; a swing or rotary granulator expects a pre-mixed wet mass.
What granule size do you need? For wet routes, screen aperture or rotor configuration sets the size. For dry routes, the compaction and milling stages control it.
What throughput? Swing granulators suit smaller batches; rotary and high-shear units scale higher.
Where does it sit in the line? Granulation usually sits between mixing and drying, with screening after drying. A quick sizing granulator (KZL) often follows the dryer.

The site notes that capacity and particle-size range depend on the material, and that the manufacturer's engineers tailor the equipment to the application — so treat the table above as a starting filter, not a final spec.

Key Selection Criteria

Capacity — match to your batch size and required output rate.
Granule size range — driven by screen aperture (wet routes) or compaction/milling settings (dry routes).
Binder or moisture needs — wet routes need a liquid addition and a downstream drying step; dry routes do not.
Line integration — check how the granulator connects to your mixer upstream and dryer/screen downstream. A GHL unit collapses mixing and granulation into one vessel; a KZL unit is a finishing step.
Material sensitivity — heat- and moisture-sensitive products point to dry granulation.

Common Operating Problems

Uneven granules — usually a feed-consistency or screen/rotor issue. Check that the wet mass is uniform before granulation and that the screen is not worn or partially blocked.
Caking — over-wetting or insufficient mixing before granulation. Reduce liquid addition or improve pre-mixing.
Low yield / too many fines — screen aperture too large, rotor speed mismatched, or (in dry granulation) insufficient compaction force.
Over-dense, hard granules — too much binder or excessive shear in a high-shear unit; adjust binder level or impeller settings.

Where to Go Next

If you are still defining the front end of your line, the related decisions are which mixer prepares the feed and which sifter classifies the finished granules. Granulation sits between them, so the granulator choice should follow from your mixing method and your target particle-size distribution, not the other way around. For material-specific capacity and granule-size data, the manufacturer's engineers provide tailored recommendations based on the actual product.