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Drying process of 3 in 1 Compact Dehumidifying Dryer in injection molding

2025/07/11 By Topstar

3 in 1 Compact Dehumidifying Dryer 2-1

During the R&D and design process, we integrated the dehumidification and drying machines into a 3 in 1 Compact dehumidifying dryer, which can provide a perfect resin drying effect for the injection molding machine. We divide the drying process into four stages, covering compressed air treatment, rapid pressure change dehumidification, ultra-dry air delivery, and sealed barrel moisture absorption. The system first filters and cleans water and oil from the workshop’s compressed air using a dedicated removal screening program before routing it to the dehumidification tower.

While the pressure in the variable cylinder dehumidification tower is rapidly reduced, the dehumidified air with a dew point of -40 is obtained, and the -40 dew point dehumidified air (one-way delivery) is continuously sent to the sealed dehumidification barrel to absorb the moisture of all raw materials in the barrel. This system features a one-way air supply, eliminating the need for regenerated dehumidification.

Comprehensive filtration of water and oil

Our 3 in 1 Compact Dehumidifying Dryer’s multi-stage screening system strictly pre-treats the workshop’s compressed air before it enters the dehumidification tower. Next, the air passes through a coalescing filter rated to remove particles as small as 0.01 microns, thereby removing large amounts of water and oily aerosols. Additionally, an activated carbon filter element further removes hydrocarbon vapors, protecting downstream components and desiccant beds. You need to regularly check the filter pressure differential and replace the filter element according to a data-driven maintenance plan to ensure that each cleaning removes more than 99% of contaminants. This ensures that only ultra-pure, oil-free air can enter the dehumidifier, thereby maintaining the desiccant’s capacity and preventing the resin from discoloring or degrading during the drying process.

Drying process

Rapidly reduce the pressure in the dehumidifier tower in the 3 in 1 Compact Dehumidifying Dryer

The filtration system sends the purified mixture to the dehumidifier tower once it completely removes water and oil. We regenerate the desiccant and produce ultra-dry air by quickly reducing the pressure. One of the core components of the 3 in 1 compact dehumidifying dryer is our patented variable cylinder dehumidifier tower. For example, we can reduce the tower pressure from 1 bar to 0.2 bar in five seconds, which will trigger adiabatic expansion, thereby driving moisture out of the silica gel. The system repeats this pressure oscillation cycle every two minutes, delivering a continuous supply of -40°C dew point air without requiring external heating. At the same time, you can fine-tune cylinder valve timing and monitor desiccant temperature to optimize regeneration efficiency, ensuring peak drying power even when plant load fluctuates. This regeneration-free approach reduces energy consumption and eliminates downtime associated with traditional heated dryers.

Sealed barrel moisture absorption

Inside the sealed barrel of the 3 in 1 compact dehumidifying dryer, the dry air absorbs residual moisture from the raw materials through patented baffles and distribution manifolds. At the same time, the internal baffle design promotes turbulent airflow, which maximizes contact between resin particles and dry air. The operator can set a dwell time of 2 to 6 hours in the microcomputer control, and adjust it based on the hygroscopicity of the resin to maintain moisture levels below 0.02%. Quick-release clamps and purge ports on all barrels simplify cleaning and material changes, reducing downtime and maintaining hygiene in strictly regulated production environments.

Drying and Dehumidifying System 9-1

Continuous -40°C dew point air delivery to 3 in 1 compact dehumidifying dryer

After complete purification, the -40°C dew point air is passed through our sealed dehumidifying drum in a single continuous stream without recirculation. The unidirectional airflow prevents moisture re-entry and cross-contamination, ensuring that materials such as nylon, PET, or polycarbonate are continuously exposed to an ultra-dry environment. “Our microcomputer-controlled system maintains a precise airflow rate of 100-150 L/min, with adjustable settings for hopper size and resin throughput. This steady-state delivery ensures uniform drying dynamics, reduces the risk of moisture-induced defects, and supports high-throughput molding cycles without manual intervention.

Regeneration-free unidirectional air supply

Unlike traditional desiccant dryers, which require alternating regeneration cycles and heated purge air, our 3 in 1 compact dehumidifying dryers utilize a continuous, unidirectional air supply system. The system requires no purge air heating (typically 20-30% of energy loss in older systems), actively lowering operating costs and increasing time between maintenance. I integrate real-time dew point sensors upstream and downstream of the tower to dynamically adjust the timing of the regeneration cylinder, maintaining a temperature of -40°C even when ambient conditions change. This regeneration-free design ensures that the dryer supports 24/7 injection molding operations, minimizes operator supervision, and maximizes energy savings.

Bringing the most complete drying process

The drying process of the 3 in 1 compact dehumidifying dryer covers four stages, namely compressed air treatment, rapid pressure swing dehumidification, ultra-dry air delivery and sealed barrel moisture absorption. It integrates rapid pressure swing regeneration, multi-stage water and oil filtration, continuous -40°C dew point air delivery, and sealed barrel moisture absorption to provide a seamless, energy-saving drying process for injection molding machines. Ensure consistent pellet dryness and optimal molding quality by calibrating and monitoring each component, from pre-treatment filters to desiccant circulation algorithms.

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