Vacuum Coaters

Vacuum Coater is an advanced coating system that allows high-volume liquid addition (oil, enzymes, micronutrients…) deep into the core of pelleted or extruded products through a vacuum and reverse diffusion process.

This equipment is specially designed to increase oil levels up to 30% while maintaining pellet durability and product quality — a feat that conventional post-pellet oil coating systems cannot achieve.

Why Vacuum Coating?

Adding more than 5% oil before pelleting typically reduces pellet durability and cohesion.
For poultry, aquafeed, and petfood — where high energy levels and nutrient uniformity are critical — post-pellet oil addition is essential.
By vacuuming air from pellet pores and then injecting liquids under reversed pressure, nutrients are deeply absorbed into the pellet core, minimizing losses and enhancing digestibility and nutritional value.

Categories: Coating System, Feed Equipment, Feed Solutions, Specialized Machinery

Description

Working Principle

Air is evacuated from the pellets by a vacuum pump system.
Liquid additives (such as oil, enzymes, bioactives…) are sprayed inside the coating chamber.
As pressure is restored, the liquid is forced into the pellet core by compression.
This ensures uniform internal coating, without wetting the outer surface — avoiding clumping and stickiness.

Outstanding Benefits

More precise and uniform coating compared to traditional external oil sprayers.
Does not contaminate pellet mills or extruders — extends equipment lifespan.
Improves oil-soluble vitamin absorption, enhances feed efficiency.
Maintains pellet durability (PDI) and minimizes fines.
Enhances both nutritional value and physical stability of the feed.
Adjustable pressure control makes it suitable for both low-density (extruded) and high-density (pelleted) feed types.