Integrated Screening Double Roller Granulator: Streamlining Dry Compaction to Direct Packaging

The double roller extrusion granulator with integrated discharge screening is a custom-engineered dry granulation solution designed to simplify fertilizer production lines. By mounting a precision vibrating screening module directly beneath the crushing chamber, this machine automatically separates fine dust and oversized particles the moment granules are formed.

By bypassing traditional standalone rotary or vibrating screens, this all-in-one dry roller compactor delivers dust-free, perfectly sized granules ready for immediate automatic packaging, drastically reducing factory footprint, labor requirements, and machinery investment.

Technical Innovation: How Integrated Screening Changes the Line
Traditional dry granulation requires a long equipment footprint: Compactor → Crusher → Bucket Elevator → Standalone Screen → Packaging Machine.

This custom-designed system consolidates the post-compaction workflow directly within the main machine frame:

Key Engineering Features

• Direct Discharge Screening Deck
  A compact, high-efficiency screening mesh is integrated right at the granulator outlet. As material leaves the crushing teeth, it immediately undergoes sizing—retaining qualified granules on top while letting fines drop into the recycle chute.
• Closed-Loop Powder Recycling
  Undersized fines and uncompacted dust are automatically directed into an integrated return system, feeding back into the hopper for re-granulation with zero raw material waste.
• Heavy-Duty Wear-Resistant Rollers
  Forged from specialized corrosion-resistant alloy steel, the counter-rotating rollers operate under ambient temperature dry pressure, eliminating the need for thermal dryers, coolers, or chemical binders.
• Dust-Tight Enclosed Housing
  The entire compaction and screening section is completely sealed, maintaining a clean, dust-free workshop environment that complies with strict industrial health standards.

Multi-Industry Material Processing Scenarios
1. NPK & Moisture-Sensitive Chemical Blends
Ideal for ammonium sulfate, potassium chloride, and hygroscopic NPK formulas. Because dry extrusion generates no moisture, the integrated screen removes fine chemical dust, allowing granules to be bagged instantly without caking.

2. Bio-Organic & Humic Acid Fertilizers
Processes composted animal manure, humic acid powder, and organic meals. The outlet screen removes fibrous dust, delivering clean, uniform organic pellets that meet commercial retail market standards.

3. Commercial Minerals & Cat Litter Granulation
Suitable for bentonite clay cat litter and industrial mineral salts. Guarantees a dust-free finished product straight out of the discharge chute, ready for high-speed automated pouch filling.

Field Operational Protocol: From Powder to Package

1. Dry Material Injection: Raw powder (moisture content < 5%–10%) enters the top feeding hopper.
2. High-Pressure Extrusion: Counter-rotating rollers press the loose material into dense, solid flakes.
3. Primary Granulation: Internal rotary cutter blades break the flakes into raw granules.
4. Immediate Outlet Screening: Granules fall directly onto the built-in discharge screen plate; dust and oversized pieces are automatically diverted away.
5. Direct Packaging Run: Dust-free, uniform granules flow directly out of the discharge port into an automated weighing and bagging scale.

Frequently Asked Questions
Q: How does the integrated screening outlet handle different granule sizes?
The built-in screening deck features quick-change mesh plates. Operators can swap screen sizes (e.g., 2 mm, 3 mm, 4 mm, or 5 mm) in minutes depending on target product specifications.

Q: Why can granules be packaged immediately without cooling?
The double roller extrusion process uses mechanical pressure rather than heat or liquid binders to bind particles. Since no thermal moisture is introduced, the discharged, screened granules are at ambient temperature and ready for immediate bagging.

Q: Can this machine be integrated into existing automated production lines?
Yes. The discharge outlet can be aligned directly above belt conveyors, bucket elevators, or automated packaging hoppers, matching standard factory CAD layouts.

Request Equipment Drawings & Factory Direct Quotes
Looking for a custom double roller extrusion granulator with integrated screening tailored to your plant dimensions and material specifications? Contact our engineering team today to receive CAD line layouts, roller socket customization options, and direct factory pricing!