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Product Description
PET, PLA, PBT, and PETG are not ordinary plastics. They belong to the family of semi-crystalline, hygroscopic polymers — materials that absorb moisture from the air, and that also need to be crystallized before they can be dried correctly. If you load them into a dryer straight from the bag and heat them to drying temperature, two problems appear at once.
First, the sticking problem. As-received PET and PLA are largely amorphous. When amorphous material is heated above its glass transition temperature, the surface softens and the pellets fuse together into clumps, bridging across the hopper and blocking the material flow. A dryer full of caked, fused PET is not drying anything — it is a blockage waiting to stop the line.
Second, the moisture problem. Like all hygroscopic polymers, PET, PLA, and PBT absorb water from ambient air. If that moisture reaches the melt, it hydrolyzes the polymer chains, degrades the material, and creates the defects every molder fears: silver streaks on the part surface, bubbles, haze, brittleness, and unacceptable color shift.
This is why a machine for these materials must do more than heat and blow air. It must crystallize the material first — raising it above the glass transition temperature so the amorphous structure crystallizes and hardens, preventing the pellets from sticking during the drying that follows. Then, and only then, it must dehumidify and dry — circulating low-dew-point dry air (or nitrogen, for oxygen-sensitive grades) through the crystallized pellets to pull the moisture down to the level injection molding demands.
Chenxing's Conveying Integrated Crystal Dehumidification Dryer is built for exactly this duty, in exactly this sequence. It is a compact, flexible machine that combines three functions in one unit — conveying, crystallization, and dehumidification drying — for semi-crystalline engineering polymers such as PLA, PET, TPU, PA, PC, PMMA, ABS, TPE, PEEK, PBT, PETG, PBAT, PGA, PBS, PCL, PHA and more. With a maximum processing capacity of 100 kg/h, a crystallization time of 1-2 hours, a drying time of 3-6 hours, a drying effect of 20-100 ppm, and a choice of dehumidification air or nitrogen as the drying medium, the is designed for the machine's own slogan: "Flexible & Compact, Powerful Function" — flexible and compact, yet powerful in function. It is applied to experimental equipment and product injection molding, from the laboratory bench to the small injection workshop.
The is a three-in-one system: a pre-dryer formed by a crystallization tower and a drying tower, an integrated conveying function, and a medium supply system that delivers dehumidification air or nitrogen as required.
Material Inlet (pellets, semi-crystalline polymer) │ ▼ [1. Conveying In] ──── integrated conveying loads material into the │ process automatically ▼ [2. Crystallization Tower] ──── 1-2 hours above the glass transition │ temperature: amorphous structure crystallizes, │ surface hardens, pellets do not stick ▼ [3. Drying Tower] ──── 3-6 hours with low-dew-point dehumidification │ air or nitrogen: moisture falls to 20-100 ppm ▼ [4. Conveying Out] ──── dried, crystallized material is conveyed │ directly to the injection press or experimental │ equipment without re-exposure to humid air ▼ [5. Injection / Experiment] ──── stable melt, no silver streaks, │ no hydrolysis, controlled color difference ▼ [Finished: crystallized, dry, moisture-proof material]
The first job of the is to crystallize the material. In the crystallization tower, the pellets are heated to a temperature above the glass transition temperature of the polymer and held there for 1-2 hours. During this stage, the amorphous structure crystallizes: the material becomes cloudy and hard, its surface stiffens, and it loses its tendency to soften and fuse.
Why does this matter? Because drying must be done at a higher temperature and for a longer time than crystallization — and a material that has not been crystallized will stick, bridge, and block the drying tower. Crystallizing first makes the subsequent drying physically possible. It also raises the material's thermal stability, so the longer drying stage does not deform or degrade the pellets.
With the material crystallized, the drying tower takes over. Low-dew-point dehumidification air — or nitrogen, where the polymer is sensitive to oxygen at elevated temperature — is circulated through the pellet bed for 3-6 hours. The dry medium absorbs the internal moisture of the material, and the moisture-laden gas is removed from the circuit. At the end of the cycle, the moisture content has fallen to 20-100 ppm — the range that demanding PET, PLA, and PBT injection molding requires.
The nitrogen option is a genuine engineering advantage. Some semi-crystalline polymers are prone to oxidation and yellowing when held at drying temperature in contact with air. With nitrogen as the drying medium, the oxygen is excluded from the drying circuit, the material does not oxidize, and the color difference value stays within the predetermined index — which the machine's own documentation emphasizes can be confirmed by pilot testing in the technical center.
The "conveying integrated" design means the material never has to leave the protected environment between drying and use. After the drying cycle, the material is conveyed directly from the drying tower to the injection press or experimental equipment — through the machine's integrated conveying function, without passing through open air. This matters because a dry pellet exposed to humid workshop air begins absorbing moisture again immediately. By keeping the material sealed from the drying tower to the machine throat, the preserves the dryness it worked 3-6 hours to achieve.
The gives the operator a real choice of drying medium: dehumidification air for standard semi-crystalline polymers, and nitrogen for oxygen-sensitive grades. The control system manages the crystallization temperature, the drying temperature, and the medium flow, keeping each stage inside its process window.
The conveying integrated crystal dehumidification dryer is a compact, experiment- and injection-grade drying system:
| Parameter | Value |
|---|---|
| Model | |
| Product name | Conveying Integrated Crystal Dehumidification Dryer |
| Application field | Experimental equipment & product injection molding |
| Processing capacity | Max. 100 kg/h |
| Drying time | 3-6 hours |
| Drying effect | 20-100 ppm |
| Crystallization time | 1-2 hours |
| Dry medium | Dehumidification air & nitrogen |
| Pre-dryer | Crystallization tower & drying tower |
| Applicable materials | PLA, PET, TPU, PA, PC, PMMA, ABS, TPE, PEEK, PBT, PETG, PBAT, PGA, PBS, PCL, PHA, and more |
Note: The degree of crystallinity and the color difference value reach the predetermined index after processing. There may be deviations depending on the material grade and condition, which can be determined by testing in the technical center pilot line.
The specifications above are the verified ratings. For different throughputs or additional process requirements, the and optional configurations are available, with custom sizing on request. Chenxing's technical center offers pilot line testing — you can send your actual material, have it processed in the pilot line, and verify the crystallinity, moisture, and color difference values before you buy. That is how a small machine can be specified with confidence.
Feature: The combines a crystallization tower and a drying tower in a single pre-dryer, handling the full crystallization-plus-drying sequence that semi-crystalline polymers require.
Advantage: Conventional setups need a separate crystallizer and a separate dryer, with material transfer between them. The runs the two stages continuously, in the correct order, in one compact unit.
Benefit: Smaller footprint, shorter process, lower investment. For PET, PLA, PBT, and PETG processing, the crystallize-then-dry sequence is complete in one machine — from laboratory trials to injection molding production.
Feature: The conveying function is integrated into the drying system: material is conveyed into the process automatically and carried from the drying tower to the consumer without open-air handling.
Advantage: A conventionally dried pellet re-absorbs humidity the moment it is exposed to workshop air. The moves the dry material directly from the drying tower to the injection press or experimental equipment.
Benefit: The 20-100 ppm drying result is actually delivered to the process, not lost in transit. Moisture levels stay stable, and the injection melt is consistent, shot after shot.
Feature: The is engineered for compactness, carrying crystallization, drying, and conveying in a machine sized for a laboratory bench or a small injection workshop.
Advantage: The machine is easy to position, easy to move, and easy to integrate into existing small lines. It does not demand the space and infrastructure of a large central drying plant.
Benefit: Flexible placement and quick reconfiguration. A lab that changes experiments, or a small workshop that changes products, can move and re-purpose the machine without re-engineering the plant.
Feature: The is rated for a maximum processing capacity of 100 kg/h.
Advantage: This capacity matches the material demand of experimental equipment, pilot lines, and small injection molding machines — enough for real production, small enough for precise control.
Benefit: Low energy consumption and minimal material waste per run. For new product development, small-batch trials, and sample validation, you dry only what you need, without the cost of oversized equipment.
Feature: The achieves a drying effect of 20-100 ppm residual moisture after a 1-2 hour crystallization stage and a 3-6 hour drying stage.
Advantage: The crystallization stage prevents the sticking and thermal damage that would otherwise ruin the drying run, so the drying stage can deliver its full moisture-removal performance.
Benefit: PET, PLA, and PBT parts meet their strict moisture-driven requirements — transparency, mechanical strength, and color stability are consistent. Where the material grade is demanding, the color difference and crystallinity values can be verified in advance by technical center pilot line testing, so there are no surprises at the press.
Feature: The supports both dehumidification air and nitrogen as the drying medium, selectable according to the material.
Advantage: Oxygen-sensitive polymers — which can yellow or degrade when held at drying temperature in air — are dried in an oxygen-free nitrogen environment. Standard materials run economically on dehumidification air.
Benefit: A single machine covers the whole semi-crystalline family without compromising the materials that need protection. Color difference stays within the predetermined index, and even sensitive grades come out clean and stable.
Feature: The completes drying in 3-6 hours, with crystallization completed separately in 1-2 hours, on a predictable cycle.
Advantage: Predictable, repeatable drying cycles let the operator plan trials and production with confidence, and the same machine serves multiple small batches per day.
Benefit: Faster turnaround from material to part — less waiting, higher throughput for experiments and small injection runs, and quicker feedback in product development.
Feature: The is compatible with PLA, PET, TPU, PA, PC, PMMA, ABS, TPE, PEEK, PBT, PETG, PBAT, PGA, PBS, PCL, PHA and more.
Advantage: Instead of dedicating a machine to each material, one processes the entire family of semi-crystalline and hygroscopic polymers, with the medium and temperature set per material.
Benefit: Maximum return on investment for laboratories and small workshops that work with many formulations. One compact machine serves PET experiments today and PLA trials tomorrow — flexible, efficient, and economical.
The lives where materials are tested and products are molded: the laboratory, the pilot line, and the small injection workshop.
In a laboratory or technical center, the does more than dry — it validates. Before a new PET or PLA grade is committed to a full production line, it can be processed in the technical center pilot line: crystallized, dried, and checked for crystallinity, moisture, and color difference. The machine's own documentation states this explicitly — the degree of crystallinity and the color difference value reach the predetermined index, and any deviation can be determined by testing in the technical center pilot line. For researchers, this means a small, controllable machine that tells the truth about a material before the factory commits to it.
In injection molding, the feeds the press directly. Its integrated conveying function carries the dry material from the drying tower to the machine throat, so the 100 kg/h of dry, crystallized pellets arrives at the screw in the same 20-100 ppm condition it left the tower. Silver streaks disappear, mechanical properties hold, and color remains stable — the exact outcomes that semi-crystalline polymers demand.
Chenxing supplies drying technology for every scale. The choice depends on the material and the throughput:
| Application | Recommended Machine | Drying Medium | Best For |
|---|---|---|---|
| Semi-crystalline polymers, small capacity | conveying integrated crystal dehumidification dryer (this page) | Dehumidification air & nitrogen | PET, PLA, PBT, PETG — crystallization + drying + conveying, max 100 kg/h, laboratory and injection |
| Hygroscopic polymers, large capacity | 750A dehumidifying dryer | Low-dew-point dehumidification air | PET, PA, PLA, PC, TPU, PEEK — 20-100 ppm drying, max 5 t/h, large pelletizing and extrusion lines |
| General pellets, hot-air drying | STG-U hopper drier / plastic resin dryer | Hot air | Surface-moisture drying of general plastics, PVC, ABS, standard pellets |
The rule of thumb is simple: semi-crystalline, hygroscopic engineering polymers in small batches and experiments — PET, PLA, PBT, PETG — choose the , because they need crystallization before drying and they need it in a compact, conveying-integrated machine. Hygroscopic engineering polymers at large tonnage choose the 750A. General pellets with only surface moisture are served by the STG-U hot-air drier. The three machines do not compete; they cover three different jobs.
The fits naturally into the complete Chenxing material handling ecosystem. Material arrives at the machine by the same conveying equipment used across the plant — a screw feeder automatic feeding machine for pellets, a VLF powder suction machine or VLF-L continuous powder suction machine for powders, and an FSP crushing material suction machine where regrind is returned to the process. Where formulations are blended before molding, a high-speed mixer industrial mixer compounds the recipe. Where the workshop reclaims its own sprues and runners, plastic crushers and the agglomerator film densifier handle recovery, and a CJ magnetic frame hopper magnet protects the process at the feed point. Where milled powders are required, PVC disc pulverizers, dual disc pulverizers, and SMP knife pulverizers supply the powder fraction, and a vibrating screen classifies the material. Whatever the surrounding equipment, the 's role is constant: crystallize, dry, and deliver semi-crystalline polymer in the exact condition the mold needs.
It is a machine that combines three functions in one compact unit: conveying, crystallization, and dehumidification drying. Semi-crystalline polymers such as PET, PLA, and PBT must first be crystallized — heated above the glass transition temperature so the amorphous structure hardens and the pellets do not stick — and then dried with low-dew-point medium. The does both stages in a crystallization tower and a drying tower, and its integrated conveying function moves the material in and out automatically, delivering the dried pellets directly to the injection press or experimental equipment without open-air handling.
Because as-received PET, PLA, and PBT are largely amorphous. If amorphous material is heated directly to drying temperature, the surface softens and the pellets fuse into clumps that bridge and block the hopper. Crystallization — holding the material above the glass transition temperature for 1-2 hours — converts the amorphous structure to a crystalline one: the pellets harden, the surfaces stiffen, and the material becomes physically safe to dry. Without this step, the drying stage itself fails. The performs the crystallization in its dedicated crystallization tower before the material enters the drying tower.
The achieves a drying effect of 20-100 ppm residual moisture, after a 1-2 hour crystallization stage and a 3-6 hour drying stage with dehumidification air or nitrogen. This is the moisture range that demanding PET, PLA, and PBT injection molding requires for defect-free parts. The exact value within the range depends on the material grade, initial moisture content, and process settings. For demanding grades, the achieved crystallinity and color difference values can be verified by technical center pilot line testing — send your material, and Chenxing will confirm the result before you buy.
The two machines serve different scales and different materials. The is a compact conveying integrated crystal dehumidification dryer for semi-crystalline polymers — it adds a crystallization stage (1-2 h) that PET, PLA, and PBT need, uses dehumidification air or nitrogen, has a maximum capacity of 100 kg/h, and is designed for experimental equipment and product injection molding. The 750A dehumidifying dryer is a large-capacity dehumidification dryer rated for max 5 t/h, using low-dew-point dehumidification air, for large pelletizing, sheet extrusion, and central feeding lines processing hygroscopic engineering polymers. If you run a small injection workshop on semi-crystalline materials, the is the match; if you run a multi-ton line, the 750A is the answer.
Yes. The supports both dehumidification air and nitrogen as the drying medium. Nitrogen is selected for polymers that are sensitive to oxygen at elevated drying temperature — materials that would otherwise oxidize, yellow, or degrade when held in hot air. Drying in an oxygen-free nitrogen environment keeps the color difference value within the predetermined index and protects the material's properties. Standard materials run economically on dehumidification air; the operator selects the medium according to the polymer being processed.
Yes — this is exactly what the machine is designed for. Its application field is experimental equipment and product injection molding. With a maximum capacity of 100 kg/h, a compact footprint, and integrated conveying, it suits a laboratory bench, a pilot line, or a small injection workshop where batches are small and products change frequently. It dries only what is needed, switches materials without heavy reconfiguration, and can be moved and re-purposed as the work changes. The machine's slogan — "Flexible & Compact, Powerful Function" — describes precisely this fit.
The is compatible with PLA, PET, TPU, PA, PC, PMMA, ABS, TPE, PEEK, PBT, PETG, PBAT, PGA, PBS, PCL, PHA and more. This covers the semi-crystalline polymers that need crystallization before drying (PET, PLA, PBT, PETG, PBAT) as well as the broader hygroscopic engineering polymer family used in injection molding. Because the machine supports both dehumidification air and nitrogen, even oxygen-sensitive grades can be processed safely. One compact machine therefore serves the full range of materials a laboratory or small injection workshop typically runs.
Step 1 — Tell Us Your Material and Application: Share the polymers you process (PET, PLA, PBT, PETG, PA, PC, TPU, or others from the compatible family), your batch size, and whether the machine will serve a laboratory, pilot line, or small injection workshop. If you use oxygen-sensitive grades, mention them — this decides the nitrogen option.
Step 2 — Verify with Pilot Line Testing: For demanding materials, take advantage of Chenxing's technical center pilot line testing. Send your actual resin, and our engineers will process it in the pilot line to confirm the crystallinity, moisture level, and color difference values before you commit. This is how the is specified with confidence — you see the result on your material first.
Step 3 — Request a Quote from Nicole: Contact Nicole at +8615951187228 or ceo@cxsljx.com with your material details and application. We respond within 24 hours with a formal quotation, delivery schedule, and the recommended configuration — crystallization tower, drying tower, conveying options, and nitrogen capability. Chenxing provides installation guidance, commissioning support, and operator training on crystallization, drying, and medium selection.
Step 4 — Flexible, Compact, Powerful — from the First Trial: After installation, the starts crystallizing and drying your material the way it was validated — 20-100 ppm dryness, 1-2 h crystallization, 3-6 h drying, dehumidification air or nitrogen, delivered directly to the press. The silver streaks disappear, the color stays within index, and every experiment and every small batch runs on material you can trust.
For the complete material handling ecosystem, Chenxing also supplies: the 750A dehumidifying dryer for large-capacity dehumidification drying, the STG-U hopper drier plastic resin dryer for hot-air drying of general pellets, VLF powder suction machines and VLF-L continuous powder suction machines for powder conveying, FSP crushing material suction machines for regrind, screw feeders automatic feeding machines for pellet transfer, high-speed mixers for compounding, PVC disc pulverizers for milling, plastic pelletizers and PVC hot-cutting pelletizing lines for pellet production, parallel co-rotating twin screw extruders for compounding, 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 part.
Contact Chenxing Machinery Today:
Contact Person: Nicole
Phone / WhatsApp: +8615951187228
Email: ceo@cxsljx.com
Company: Zhangjiagang Chenxing Machinery Co., Ltd.
Website: www.chenxingmachinery.com
