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Product Description
Every pellet of PET, PA, PLA, PC, TPU, or PEEK is a moisture trap. These engineering polymers are hygroscopic — they absorb water vapor from the air continuously, and by the time a bag has been open for a few hours, the material has already picked up several hundred parts per million of moisture. If that moisture reaches the melt, it hydrolyzes the polymer chains, degrades the material, and creates the defects every processor fears: silvery streaks on the surface, bubbles in the wall, haze in transparent parts, and a permanent loss of mechanical strength.
This is why drying is not optional for these materials — it is the difference between a saleable product and a scrap pile. But there is drying, and there is drying. A conventional hot-air hopper drier heats ambient air and blows it through the pellets. It can warm the material and drive off surface moisture, but it cannot remove the humidity from the air itself — the same air, loaded with moisture, recirculates through the pellets and redeposits what it carried in. For a hygroscopic polymer like PET or PA, hot-air drying simply cannot reach the low moisture levels the process demands. The moisture stays, and the defects follow.
The engineering answer is dehumidification drying: first remove the moisture from the air, then use that dry air to dry the material. A dehumidifying dryer produces low-dew-point dehumidification air, circulates it through the pellets to draw out the internal moisture, and controls the process so each polymer is dried at its own optimum temperature. Chenxing's dehumidifying dryer is built for exactly this duty — a polymer dehumidification drying machine with a maximum processing capacity of 5 t/h, a drying time of 3-6 hours, a drying effect of 20-100 ppm, independent temperature control of the drying barrels, and compatibility with the full family of hygroscopic engineering plastics: PLA, PET, TPU, PA, PC, PMMA, ABS, TPE, PEEK, PPS, PBTG, PSMT, PGA, PBS, PCL, PFA.
The is a complete drying system in one machine: a dehumidification unit that prepares the drying air, a set of insulated drying barrels where the material is dried, and a heating and control system that keeps every barrel at its own optimum temperature.
Ambient Air │ ▼ [1. Dehumidification Unit] ──── air is dried to a low dew point │ (moisture removed before heating) ▼ [2. Heating] ──── the dry air is heated to the set drying temperature │ ▼ [3. Drying Barrels] ──── low-dew-point hot air enters from the bottom │ of the insulated barrel, passes up through the pellet │ bed, and carries internal moisture out of the material ▼ [4. Independent Temperature Control] ──── each barrel maintains its │ own set temperature, matched to the polymer inside ▼ [5. Moisture Removal] ──── moisture-laden air is exhausted or routed │ through the regeneration system; the drying circuit │ remains dry and continuous ▼ [6. Discharge to Process] ──── dried material (20-100 ppm) flows to │ the extruder, injection press, or pelletizing line │ ▼ [Finished: polymer dry, moisture-proof, ready to process]
1. Dehumidification — The Air Is Dried First. The critical difference from hot-air drying happens here. Ambient air — which on a humid day can carry substantial moisture — enters the dehumidification unit, where it passes through a desiccant bed or drying tower and is dried to a low dew point. The air is dry before it is hot. This is the "dehumidification air" that defines the machine's drying medium: the dries with dehumidification air, not ordinary heated air.
2. Heating — Dry Air, Brought to Temperature. The low-dew-point air is then heated to the required drying temperature. Because the air is already dry, heating it does not create "wet heat" — the air arrives at the pellets carrying capacity to absorb moisture, not moisture to redeposit.
3. Drying Barrels — Dry Air Through the Pellet Bed. The dry hot air enters the bottom of the insulated drying barrel and rises through the pellet bed. As it passes each pellet, it absorbs the moisture migrating from the interior of the material to its surface. Over the 3-6 hour drying time, the moisture concentration in the pellets falls steadily — from the hundreds of ppm picked up in storage down to the 20-100 ppm range that demanding processes require.
4. Independent Temperature Control — Every Polymer at Its Own Temperature. Different polymers dry at different temperatures. PET needs a different regime than PA; PLA cannot tolerate the temperatures that PEEK requires. The 's independent temperature control of the barrels means each drying barrel maintains its own set temperature, independent of the others. A line drying PET and PA simultaneously runs each at its correct temperature — no compromise, no overheating, no degradation.
5. Moisture Removal — The Humidity Leaves the Circuit. The moisture-laden air from the barrels is exhausted or routed through the regeneration system, keeping the drying circuit dry and continuous. The system runs as a closed loop: dry air in, moisture-laden air out, material dried in between.
6. Discharge to Process — Dry Material, Ready to Run. After the drying cycle, the material — now at 20-100 ppm — is discharged to the downstream process: an extruder, an injection molding machine, or a pelletizing line. Because the material is dry, the melt is stable, the surface is defect-free, and the mechanical properties are preserved.
The dehumidifying dryer is a large-capacity polymer drying machine, specified as follows:
| Parameter | Value |
|---|---|
| Model | |
| Application | Dehumidification and drying process for polymers |
| Processing capacity | Max. 5 t/h |
| Drying time | 3-6 hours |
| Drying effect | 20-100 ppm |
| Drying temperature | Independent temperature control of drying barrels |
| Drying medium | Dehumidification air & humidity (low-dew-point dry air) |
| Applicable materials | PLA, PET, TPU, PA, PC, PMMA, ABS, TPE, PEEK, PPS, PBTG, PSMT, PGA, PBS, PCL, PFA |
| Configuration options | Twin-tower technology / central drying system configuration available on request |
The specifications above are the verified ratings. For larger demands or multi-station plants, the and optional larger capacities are available, with custom sizing on request. The machine can also be configured with twin-tower technology or as part of a central drying system — where one dehumidification unit serves multiple drying barrels and processing stations — on request. Tell Chenxing your polymers, your throughput, and your plant layout, and we will specify the dehumidification unit, barrel sizes, and control architecture to match.
Feature: The dries with dehumidification air — air that is first dried to a low dew point, then heated, rather than ordinary hot air blown from the environment.
Advantage: Hot-air drying recirculates humid air through the pellets, redepositing moisture and capping the achievable dryness. Dehumidification air has the capacity to absorb internal moisture continuously — it takes water out of the polymer instead of just warming its surface.
Benefit: Hygroscopic engineering plastics are dried to the 20-100 ppm range that their processes demand. The hydrolyzing moisture is gone, so the melt is stable, the surface is free of silver streaks and bubbles, and the finished product keeps its transparency, strength, and appearance.
Feature: The is engineered to increase crystal dehumidification efficiency by 50% — the performance promise printed on the machine itself.
Advantage: More effective drying per unit of air and per unit of time means the material reaches its target moisture level faster and more completely.
Benefit: The 3-6 hour drying cycle delivers consistently dry material with less waiting, which translates into higher throughput, lower energy use per ton of dried resin, and faster turnaround of material between batches. For a line running continuously, a 50% efficiency gain in drying is a direct gain in productivity.
Feature: The is rated for a maximum processing capacity of 5 t/h of polymer.
Advantage: A large pelletizing line, sheet extrusion line, or central feeding installation consumes engineering resin at multi-ton-per-hour rates. A 5 t/h dehumidifying dryer keeps pace with that demand from a single machine.
Benefit: High-volume production without the complexity of running multiple small dryers. One machine, one control system, one footprint — and enough dry material to keep the biggest downstream process fed at full speed.
Feature: Each drying barrel of the is controlled independently, maintaining its own set temperature.
Advantage: PET, PA, PLA, PC, and TPU have different optimum drying temperatures; running them all at one temperature either under-dries some or degrades others. Independent control lets each barrel hold its correct regime simultaneously.
Benefit: Flexible, multi-formulation production without compromise. A plant switching between materials — or drying two materials side by side — keeps every polymer at its safe, effective drying temperature, avoiding both residual moisture and thermal degradation.
Feature: The achieves a drying effect of 20-100 ppm residual moisture in the dried material.
Advantage: This is the moisture range that demanding applications require — transparent PET packaging, precision PA parts, high-performance PEEK components — where residual moisture directly controls quality.
Benefit: Consistent, specification-level dryness batch after batch. The downstream process runs stable, the products meet their mechanical and optical requirements, and rejected parts from moisture-related defects drop to near zero.
Feature: The completes its drying cycle in 3-6 hours, supported by the higher dehumidification efficiency of the system.
Advantage: Shorter, predictable drying cycles mean material moves from the dryer to the process faster, and the same barrels can serve more batches per day.
Benefit: Lower work-in-progress, less resin sitting in drying, and faster response when the production schedule changes. Drying stops being a bottleneck and becomes a dependable, fast step in the process flow.
Feature: The operates as a closed-loop drying system: dry air circulates through the barrels, and moisture-laden air is exhausted or regenerated in a controlled way.
Advantage: Unlike open hot-air blowers that pour hot humid air into the workshop, the closed loop keeps the drying circuit contained and efficient — the heat and dryness are used for drying, not wasted on the room.
Benefit: A cleaner, more comfortable workshop with no hot moisture venting around the machines, lower energy consumption per kilogram of dried resin, and a drying process that is not influenced by the outside weather or the plant's ambient humidity.
Feature: The is compatible with PLA, PET, TPU, PA, PC, PMMA, ABS, TPE, PEEK, PPS, PBTG, PSMT, PGA, PBS, PCL, PFA — the full range of hygroscopic and moisture-sensitive engineering polymers.
Advantage: Instead of buying a dedicated dryer per material, one system covers the entire family — with independent barrel temperature control matching each material's drying window.
Benefit: Maximum return on the drying investment, particularly for multi-formulation plants. The same machine serves transparent PET one shift, PA the next, and PLA after that — drying every material correctly, with no extra capital equipment and no risk of cross-material drying errors.
The is built for the demanding end of polymer processing — where drying is a quality gate that no production manager can afford to fail.
[Raw Polymer Pellets / Bags / Silos] │ ▼ [ Dehumidifying Dryer] ── low-dew-point dehumidification air, │ independent barrel temperature control, │ 20-100 ppm drying effect, max 5 t/h ▼ [Extruder / Pelletizing Line / Sheet Line / Injection] │ ▼ [Finished Product]
Step 1 — Material Intake. Raw polymer pellets — PET, PA, PLA, PC, TPU, or others — arrive in bags or silos and are loaded into the drying barrels. The material can be brought to the dryer by the screw feeder / automatic feeding machine for pellets or, for powders, by a VLF powder suction machine.
Step 2 — Dehumidifying Drying. The dries the material with low-dew-point dehumidification air, each barrel at its own optimum temperature, over 3-6 hours, to 20-100 ppm.
Step 3 — Downstream Processing. The dry material feeds the consumer — a parallel co-rotating twin screw extruder compounding a formulation, a plastic pelletizer or PVC hot-cutting pelletizing line producing pellets, a sheet line, or an injection molding machine. Because the material is dry, the melt is stable and the product is defect-free.
Chenxing supplies both drying technologies, because not every material needs the same treatment:
| Application | Recommended Machine | Drying Medium | Best For |
|---|---|---|---|
| Hygroscopic engineering polymers | dehumidifying dryer (this page) | Low-dew-point dehumidification air | PET, PA, PLA, PC, TPU, PEEK — 20-100 ppm drying, max 5 t/h |
| Non-hygroscopic / general pellets | STG-U hopper drier / plastic resin dryer | Hot air | Surface-moisture drying of general plastics, PVC, ABS, standard pellets |
The rule is simple: hygroscopic engineering polymers (PET, PA, PLA, PC, TPU, PEEK, PPS, and the rest of the moisture-sensitive family) need dehumidification drying to reach low moisture levels; general pellets with only surface moisture can be served by hot-air drying. The is the dehumidification answer — and for plants that dry both types, the two machines work side by side.
The plugs into the complete Chenxing material handling ecosystem. Dried material moves to the process through the same conveying equipment that brings it in — screw feeders for pellets, VLF-L continuous powder suction machines for high-capacity powder supply, and FSP crushing material suction machines for regrind. Where powders are compounded with the dried resin, a high-speed mixer industrial mixer blends the recipe. Where regrind is returned to the process, plastic crushers and the agglomerator film densifier handle recovery, and a CJ magnetic frame / hopper magnet protects the process at the feed point. Where fines must be screened out, a vibrating screen classifies the material, and where in-house powder is produced, PVC disc pulverizers, dual disc pulverizers, and SMP knife pulverizers supply the milled fraction.
Whatever the configuration, the 's role is the same: deliver polymer to the process dry, stable, and moisture-proof — so the melt quality and the finished product are never compromised by water.
The difference is the drying medium. A hot-air hopper drier, like the STG-U hopper drier / plastic resin dryer, heats ambient air and blows it through the pellets. It warms the material and removes surface moisture, but it cannot remove the humidity from the air itself — humid air recirculates and redeposits moisture. A dehumidifying dryer, like the , first dries the air to a low dew point, then heats it, and circulates that dry air through the pellets. This low-dew-point dehumidification air continuously absorbs internal moisture, taking the material down to 20-100 ppm. For non-hygroscopic materials with only surface moisture, hot-air drying is sufficient; for hygroscopic engineering polymers, dehumidification drying is required.
Because they are hygroscopic — they absorb moisture from the air continuously, even from dry-looking pellets. If that moisture reaches the melt, it hydrolyzes the polymer chains: PET loses intrinsic viscosity, PA loses mechanical strength, PLA degrades, PC yellows and crazes. The visible result is silver streaks on the surface, bubbles in the wall, haze in transparent parts, and a permanent loss of mechanical properties. Low-dew-point drying removes the internal moisture before melting, so the polymer chains survive the process intact. The 's dehumidification air takes these materials down to the 20-100 ppm range — the moisture level their processes demand — before they reach the screw.
The achieves a drying effect of 20-100 ppm residual moisture. This is the specification range that demanding applications require — transparent PET packaging, precision PA parts, and high-performance PEEK components all depend on moisture levels in this range for defect-free processing. The exact value within the range depends on the polymer, the initial moisture content, the drying temperature, and the drying time. Because each barrel is temperature-controlled independently, every material can be dried to its own optimum moisture level without over-drying or degradation.
The is rated for a maximum processing capacity of 5 t/h of polymer. This makes it suitable for large pelletizing lines, sheet extrusion lines, and central feeding installations where engineering resin is consumed at multi-ton-per-hour rates. For smaller stations, the machine can be configured with fewer or smaller barrels; for larger demands or multi-station plants, the and optional larger capacities are available, with custom sizing on request. Chenxing sizes the dehumidification unit and barrel configuration from your actual throughput and material mix.
Yes — this is one of the 's defining features. Each drying barrel is temperature-controlled independently, so different polymers can be dried simultaneously at their own optimum temperatures. PET, PA, PLA, PC, and TPU all have different drying windows; running them in separate barrels with independent control means each is dried correctly, with no compromise and no thermal degradation. This makes the particularly valuable for multi-formulation plants that switch materials frequently or dry several materials side by side.
The dehumidifying dryer sits between material intake and the melt-processing step. Raw pellets are loaded into the drying barrels — brought in by a screw feeder / automatic feeding machine or a vacuum loader — and after the 3-6 hour drying cycle, the dry material is discharged to the extruder, pelletizing line, sheet line, or injection press. In a large plant, the can be configured as part of a central drying system, where one dehumidification unit serves multiple drying barrels and processing stations, with the dry material conveyed to each consumer as needed.
Yes. The can be configured as part of a central drying system — a twin-tower technology arrangement where the dehumidification capacity is centralized and drying barrels are distributed to the processing stations. In this configuration, one dehumidification system serves multiple machines, each barrel maintaining its own material and temperature, and the dry material is conveyed to each consumer on demand. This is the recommended architecture for plants running many processing machines on hygroscopic polymers — it concentrates the dehumidification investment, simplifies the air handling, and gives every station a reliable, independent supply of dry resin. Chenxing engineers the complete central drying layout from your machine list and throughput.
Step 1 — Tell Us Your Polymers and Throughput: Share the materials you process (PET, PA, PLA, PC, TPU, PEEK, or others from the compatible family), your throughput in tons per hour, and the number of processing stations that need dry resin. If the dryer feeds an extruder or pelletizing line, tell us the consumption rate and the moisture specification your process requires.
Step 2 — Get a Sized Recommendation: Chenxing specifies the complete drying system: the dehumidification unit, drying barrel sizes and quantity, independent temperature control scheme, and the conveying arrangement to and from the dryer — including twin-tower technology or central drying system configuration where your plant benefits from it. You receive a clear equipment list, layout drawing, and utility requirements.
Step 3 — Request a Quote from Nicole: Contact Nicole at +8615951187228 or ceo@cxsljx.com with your polymer details and plant layout. We respond within 24 hours with a formal quotation, delivery schedule, and freight options. Chenxing provides installation guidance, commissioning support, and operator training on the dehumidification, temperature control, and drying cycle operation.
Step 4 — Dry Material, Perfect Product, from Day One: After installation, the starts delivering low-dew-point dehumidification air to your polymer — 20-100 ppm dryness, independent barrel temperatures, 5 t/h capacity. The silver streaks disappear, the mechanical properties hold, and your melt quality stops depending on the weather and starts depending on the machine.
For the complete material handling ecosystem, Chenxing also supplies: the STG-U hopper drier plastic resin dryer for hot-air drying of general pellets, CLF powder suction machines and CLF-L continuous powder suction machines for powder conveying, CSP crushing material suction machines for regrind, screw feeders automatic feeding machines for pellet transfer, high-speed mixers for compounding, PVC disc pulverizers for milling, underwater pelletizing systems for reprocessing, CJ magnetic frames / hopper magnets for metal protection, and complete lines from PVC shelf label strip extrusion to PVC UV marble sheet making. As a single-source partner, Chenxing Machinery supports every step from polymer to finished product.
Contact Chenxing Machinery Today:
Contact Person: Nicole
Phone / WhatsApp: +8615951187228
Email: ceo@cxsljx.com
Company: Zhangjiagang Chenxing Machinery Co., Ltd.
Website: www.chenxingmachinery.com
