Coating Machine

The OFEC Coating Machine is auxiliary equipment in organic fertilizer production lines, designed to apply liquid or powder coating agents onto organic fertilizer granules for anti‑caking, slow‑release control, or color enhancement. With drum diameters from 0.8 to 2.5 meters and capacities from 1 to 200 TPH, it features a reliable structure and flexible operation.

Product Overview

In organic fertilizer production, most manufacturers add a coating process after cooling and before packaging to reduce caking of finished granules, improve fertilization efficiency, or meet specific market preferences for granule appearance and color. This is achieved by applying coating agents to the granule surface.

The drum interior is fitted with strip‑shaped lifting flights to ensure thorough tumbling of granules, allowing the coating agent to evenly cover every granule surface.

The OFEC Coating Machine is similar in appearance to the rotary dryer and cooler – a slightly inclined horizontal rotating cylinder equipped with support and drive units.

Equipment Components

The coating machine consists of the following main components:

A – Drum: Core working component where coating takes place
B – Feeding Device: Feeds material into the drum
C – Discharging Device: Discharges coated material
D – Support Wheel Assembly: Supports the rotating drum
E – Transmission: Drives the drum rotation
F – Guard Cover: Safety protection
G – Rolling Ring (Tyre): Works with support wheels
H – Big Gear: Drive component
I – Pinion: Drive component

● Drum: Core working component where coating takes place

● Feeding Device: Feeds material into the drum

● Discharging Device: Discharges coated material

● Support Roller Assembly: Supports the rotating drum

● Transmission: Drives the drum rotation

● Guard Cover: Safety protection

Rolling Ring (Tyre): Works with support wheels

● Big Gear: Drive component

● Pinion: Drive component

Working Principle

The coating machine operates as follows: material enters the inclined rotating drum from the feed end. The drum interior is equipped with strip‑shaped lifting flights welded to the middle section. As the drum rotates, the flights continuously lift and tumble the granules, creating a continuous rolling motion inside the drum.

Liquid Coating: For liquid coating agents (such as anti‑caking oil, slow‑release liquids, etc.), OFEC provides corresponding tanks and pump systems. The liquid is sprayed through nozzles extending from the drum end into the interior, atomizing the coating agent for even application onto the granule surfaces.

Powder Coating: For powder coating agents (such as diatomaceous earth, kaolin, lime, bentonite, etc.), a screw feeder delivers the powder into the coating machine at a set rate. As the granules tumble, the powder uniformly coats the granule surfaces, forming a hard, smooth protective shell.
After coating treatment, the organic fertilizer granules exhibit improved appearance, reduced caking tendency, and better resistance to breakage during conveying – making them more suitable for long‑term storage and long‑distance transport.

Technical Specifications

Model	Drum Diameter (m)	Drum Length (m)	Capacity (t/h)	Power (kW)
ZBM-0.8×4	0.8	4.0	1–3	1.5
ZBM-1.2×5	1.2	5.0	4–8	3
ZBM-1.8×7	1.8	7.0	15–25	5.5
ZBM-2.2×8	2.2	8.0	40–60	11
ZBM-2.5×10	2.5	10.0	60–80	15

Model

Drum Diameter (m)

Drum Length (m)

Capacity (t/h)

Power (kW)

ZBM-0.8×4

0.8

4.0

1–3

1.5

ZBM-1.2×5

1.2

5.0

4–8

ZBM-1.8×7

1.8

7.0

15–25

5.5

ZBM-2.2×8

2.2

8.0

40–60

ZBM-2.5×10

2.5

10.0

60–80

Note: Drum diameters from 0.8 to 2.5 meters, capacities from 1 to 200 TPH. Custom specifications available upon request.

Features and Benefits

Uniform Coating

Strip‑shaped lifting flights ensure thorough granule tumbling, providing even coverage and excellent coating results.

Liquid & Powder Dual‑Use

Low operating speed, continuous running, minimal vibration and noise.

Reliable Structure

Shares the same proven design as the rotary dryer and cooler – mature technology, stable operation.

Material Options

Various materials available, including stainless steel for corrosion resistance and extended service life.

Flexible Operation

Coating agent dosage adjustable to suit different formulations and product requirements.

Easy Maintenance

Simple structure, few wear parts, low maintenance costs.

Industry Solution for Organic Fertilizer Coating Machine

Coating is the final value‑adding step in organic fertilizer production. Proper coating not only prevents granule caking but also enhances product added value and market competitiveness.

Typical Process Flow
Organic fertilizer granulation → Drying → Cooling → Screening → Coating → Packaging

Solution Advantages
● Effectively prevents granule caking and extends product shelf life
● Enables slow‑release or controlled‑release functional layers to improve fertilizer efficiency
● Allows colorants to be added to meet market preferences
● Coating layer enhances granule surface strength, reducing breakage during transport
● Liquid & powder dual‑use system flexibly adapts to different coating requirements