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Crystallizing Drying System

IRD Crystallizing & Drying Handling System

Sunwell Infrared Rotary Drum (IRD) Crystallizing / Drying System is ideal for processors of PET sheet, film extrusion and injection molding using post-industrial or post-consumer regrind as well as for processors of polyester fiber. The infra-red rays cause molecular heat oscillation acting directly to the core of the particles from the inside-out so the moisture inside the particles are quickly heated and vaporized into the circulating ambient air which removes the humidity.

A stainless steel rotary drum with an internal helix transports are materials with a tumbling action to expose all particle surfaces to infrared rays. The output needed is dependent on the drum diameter and length as well as the radiation power. Exposure time and temperature are controlled by the speed and the IR power applied during the process.

It provides continuous processing of PET flake, reducing moisture from over 4000 ppm to less than 200 ppm in 10-15 minutes even could drop to 50 ppm below if combine with desiccant drying system, compared to 5-6 hours for conventional systems. The short exposure to heat in the IRD preserves Intrinsic Viscosity properties. It has significant benefit for PET material crystallizing and drying.

Principle & Functions

The infra-red rays causes molecular heat oscillation acting directly to the core of the particles from the inside-out so the moisture inside the particles are quickly heated and vaporized into the circulating ambient air to remove the humidity at the same time.

It provides continuous processing of PET flake, reducing moisture from over 4,000 ppm to less than 50 ppm in tens of minutes, compared to 5-6 hours for conventional systems.

It is significant benefit for PET material crystallizing and drying as well as the short exposure to heat in the IRD to preserve IV properties.

IR Drying

Heat is absorbed inside the particle because the plastic and moisture are excellent IR absorbent so that the drying takes a short time.

Heating; Crystallizing and Drying are in the interior particle.

Advantages In Comparison To Conventional Systems

Up to 60% less energy than conventional drying systems.

Time and space savings.

Faster start-up and quicker shut down.

Fully continuous process.

Careful material treatment.

No segregation of products with different bulk densities.

High efficiency.

Simple handling and installation.

Infrared Rotary Drum (IRD) Process

Infra-red Dryer

The Drum has an internal helix that pushes the material forward when rotating; at the same time the material passes under the IR radiators for drying.

The output needed will size the drum diameter and length together with the radiation power. Exposure time and temperature are controlled by the speed and the IR power applied during the process.

IRD Specification

Application: 50% virgin + 50% regrind APET

Bulk density: 0.75 g/cm3 + 0.4 g/cm3

Initial material moisture: virgin 4,000ppm; regrind 6,000ppm*


MODEL IRD050-120 IRD072-240 IRD072-300 IRD120-300 IRD120-360
Drum Size (Dia. x L mm) 500 x 1200 720 x 2400 720 x 3000 1200 x 3000 1200 x 3600
Feeder Size (Dia. x L mm) 50 x 400 90 x 600 90 x 600 100 x 650 100 x 650
Output Capacity (kgs/hr) 50 120 150 250 350
Infrared Lights Power (kW) 36 54 63 84 144
Feeding Power (kW) 0.38 0.38 0.38 0.38 0.38
Drum Turning Power (kW) 0.38 0.75 0.75 1.5 1.5
Cooling Blower (kW) 0.2 0.2 0.2 0.4 0.4

*1 % = 10,000ppm


MODEL IRD150-300 IRD150-360 IRD150-450 IRD180-360 IRD180-450
Drum Size (Dia. x L mm) 1500 x 3000 1500 x 3600 1500 x 4500 1800 x 3600 1800 x 4500
Feeder Size (Dia. x L mm) 139 x 650 139x650 139 x 650 139 x 650 139 x 650
Output Capacity (kgs/hr) 500 700 1000 1200 1600
Infrared Lights Power (kW) 126 144 222 222 240
Feeding Power (kW) 0.75 0.75 0.75 0.75 0.75
Drum Turning Power (kW) 2.2 2.2 2.2 2.2 2.2
Cooling Blower (kW) 0.75 0.75 0.75 0.75 0.75

*1 % = 10,000ppm

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