A Single-Pass Conveyor Dryer (also called a single-pass belt dryer) is a continuous, gentle convective drying system for bulk solids, slices, flakes, granules, and extrudates. Product is laid in a controlled bed thickness on a moving belt and exposed to heated, filtered air one time from inlet to discharge. With zoned temperature, airflow, and belt-speed control, the dryer delivers uniform final moisture, high throughput, and low product degradation—ideal for foods, herbs, chemicals, biomass, and specialty materials.
Moisture is removed by forced convection and diffusion. As the bed travels through multiple zones, process air (co-current, counter-current, or mixed-flow) passes through or over the product layer. Heat drives surface evaporation; internal moisture migrates to the surface and evaporates until the target moisture is reached. Recirculation with fresh-air make-up maximizes energy efficiency while exhaust fans remove humid air.
A single-pass conveyor dryer is a straight, insulated tunnel where product travels once through on a perforated stainless-steel or PTFE/glass belt under controlled hot-air flow. The dryer comprises a rigid MS/SS frame, modular insulated panels, zoned supply plenums with axial/centrifugal fans, and recirculating air ducts with filters and adjustable dampers; heat is provided by a gas/diesel burner hot-air generator, steam/thermal-oil coils, or electric heaters. At the infeed, a vibrator/laminator distributes product to uniform depth; along the belt, impingement nozzles or through-circulation trays drive moisture removal; at discharge, an integrated cooler and scraper/brush clean the belt. A VFD belt drive, access doors, drip trays, and exhaust stack with optional cyclone/condensate trap support hygiene and upkeep, while PLC controls regulate zone temperature, airflow, belt speed, and safety interlocks (over-temp, flame fail, door open). Contact parts are typically SS304, with quick-release sections and CIP spray bars available for fast changeovers.
via zone-wise control and even bed distribution.
preserving piece integrity and volatile compounds.
recirculation and optional heat recovery lower OPEX compared to tray and rotary dryers.
with stable quality, easy scale-up, and automated control.
handles sticky, fragile, or abrasive materials with belt and airflow choices.
(CIP, smooth interiors, good access).
per kg of evaporation and quick start/stop.
for 24/7 duty with minimal maintenance.
lengths 4–40 m; single pass with multi-zone architecture
(VFD) to tune residence time and final moisture
co-current, counter-current, or mixed through-air / over-air with adjustable dampers
with steam/TF/gas/electric heaters; optional integrated cooling section at discharge
dewatering press, shredder, grinder, sifter, metal detector, baghouse/HEPA, scrubber/odor control
PLC-HMI/SCADA, recipe library, trending, alarms, remote diagnostics
flame supervision (for gas), temperature limiters, fire detection/mist, explosion relief for dusty products
lift-up hoods, CIP bars, belt washing, quick-release scrapers/brushes, drainable floors
Unicoco, Indonesia was excited about the Coconut project, but through GEM we made this dream come true. GEM machines: dryers / screw conveyors / bleachers / graders, etc. they are absolutely good and require little maintenance. Also, we get 24×7 support from them in case we get stuck at any time.
GO FOR IT!!!
PT Unicoconut Industries Indonesia, Indonesia
Franklin Baker Company of the Philippines, in its continued effort to be the gold standard in processed coconut products, continues to partner with the best OEM suppliers for our manufacturing line requirements. One of them is GEM Forgings, which has been our trusted supplier of process equipment for our DC (desiccated coconut) dryers. We both value quality and service level in our business dealings.
Franklin Baker Company of the Philippines
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