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Description
EXTRUTEX Hopper Dryer (Cabinet Dryer)
EXTRUTEX
Austria Design • Precision Manufacturing in Nanjing & Shanghai, China
In the modern plastics processing industry, the quality of the final product is only as good as the preparation of the raw material. Moisture, dust, metal particles and temperature inconsistencies can all lead to defects such as silver streaks, bubbles, poor surface finish, reduced mechanical strength and dimensional instability. The EXTRUTEX Hopper Dryer – also known as a Cabinet Dryer – has been engineered to eliminate these risks with German-Austrian design principles and reliable Chinese manufacturing excellence.
EXTRUTEX hopper dryers are purpose-built for drying a wide range of plastic raw materials before injection molding, extrusion, blow molding or other thermal processing steps. Whether you are working with hygroscopic resins such as PET, PA (nylon), PC, ABS or with non-hygroscopic materials that simply need pre-heating, the EXTRUTEX range delivers consistent, contamination-free results. Designed in Austria and manufactured in dedicated facilities in Nanjing and Shanghai, every unit reflects a commitment to durability, energy efficiency and operator convenience.
This comprehensive guide explores the performance characteristics, technical specifications, application areas and operational advantages of the EXTRUTEX Hopper Dryer series. From compact models suitable for laboratory or small-batch production to large-capacity industrial units capable of handling more than one tonne of material, the product family covers virtually every requirement of the plastics industry.
About EXTRUTEX – Austria Design, China Manufacturing
EXTRUTEX combines European engineering philosophy with the manufacturing scale and cost-efficiency of modern Chinese production. The design office, based in Austria, focuses on mechanical reliability, thermal efficiency and ease of maintenance – hallmarks of Central European industrial equipment. Production takes place in two specialized plants located in Nanjing and Shanghai, allowing EXTRUTEX to maintain tight quality control while offering competitive pricing and short lead times.
Both manufacturing sites operate under strict quality management systems. Key components such as the stainless-steel heating barrel, air-dispersion plates and magnetic bases are fabricated and assembled under controlled conditions. Final testing includes temperature uniformity mapping, airflow verification and electrical safety checks before every unit leaves the factory. The result is a product that delivers European-level performance at a price point accessible to manufacturers worldwide.
EXTRUTEX serves customers in the automotive, packaging, medical device, consumer electronics, household appliance and construction sectors. The hopper dryer range is frequently integrated into complete turnkey extrusion or injection lines, but individual units are also supplied as stand-alone upgrades for existing production floors.
Performance Characteristics – Engineered for Reliability and Efficiency
The EXTRUTEX Hopper Dryer incorporates a series of carefully considered design features that directly address the most common pain points in plastic material drying. Below we examine each characteristic in detail, explaining not only what the feature does but why it matters in daily production.
1. Stainless-Steel Heating Barrel
The heating barrel is fabricated entirely from high-grade stainless steel. This choice of material brings several decisive advantages. First, stainless steel is inert and does not release metallic ions or other contaminants into the plastic granules. This is critical for applications in food packaging, medical devices and optical components where even trace contamination can cause product rejection. Second, the smooth internal surface of stainless steel is easy to clean. Operators can wipe or vacuum residual material without worrying about corrosion or surface degradation. Third, stainless steel withstands the repeated thermal cycling inherent in drying processes far better than carbon steel or coated mild steel, resulting in a longer service life and lower total cost of ownership.
In practice, the stainless-steel barrel ensures that every batch of material remains free from pollution, protects product quality and simplifies change-over procedures when switching between different resins or colours.
2. Stainless-Steel Net-Plate Air Dispersion Device
Uniform temperature distribution inside the hopper is essential for consistent drying. EXTRUTEX employs a stainless-steel net-plate air-dispersion system that spreads the heated air evenly across the entire cross-section of the material bed. Unlike simple perforated tubes or single-point air inlets that create hot spots and cold zones, the net-plate design forces the process air to travel through a multitude of fine openings, producing a gentle, homogeneous airflow.
The result is that the temperature remains even throughout the barrel. Material reaches the target moisture level at the same time, eliminating the risk of under-dried granules in the centre of the hopper or over-dried material near the walls. Over-drying can cause thermal degradation or yellowing of heat-sensitive resins; under-drying leaves residual moisture that manifests as splay or voids in the finished part. By guaranteeing temperature uniformity, the EXTRUTEX dispersion system maximises yield and minimises scrap.
3. Hinge Connection Between Heating Barrel and Hopper
Access for cleaning, inspection and material change-over is often overlooked in dryer design. EXTRUTEX solves this with a robust hinge connection between the heating barrel and the upper hopper section. The hinge allows the barrel to be swung open quickly and safely, giving operators full access to the interior without the need for tools or heavy lifting equipment.
This design dramatically reduces the time required for colour or material changes. Residual granules can be removed thoroughly, preventing cross-contamination. The hinge mechanism is engineered for thousands of open-close cycles and incorporates safety interlocks where required by local regulations. In high-mix production environments – common in custom moulding shops – the time saved on each change-over quickly adds up to significant productivity gains.
4. Open-Door Magnetic Base for Easy Scrap-Iron Removal
Metallic contamination is a frequent cause of nozzle blockages, screw wear and surface defects. EXTRUTEX equips its hoppers with an open-door type magnetic base. The magnetic shelf or drawer can be pulled out in seconds, allowing operators to inspect and clean accumulated ferrous particles without dismantling the entire unit.
Because the magnetic element is easily accessible, routine maintenance becomes a quick daily or shift-based task rather than a major intervention. This proactive removal of scrap iron protects downstream equipment – injection screws, barrels, hot-runner systems and extruder screws – and extends the life of expensive tooling. The open-door design also encourages operators to perform the cleaning regularly, because the procedure is simple and does not interrupt production for long.
5. Optional 24-Hour Timer / Timed Start-Up Device
Many plastics plants operate on shift patterns or run unmanned overnight. The optional timed start-up device allows the dryer to begin pre-heating at a pre-set time so that material is ready the moment the first shift begins. This eliminates the usual 1–2 hour warm-up delay that otherwise reduces productive machine time.
By matching the dryer cycle to the production schedule, manufacturers reduce idle energy consumption and improve overall equipment effectiveness (OEE). The timer is simple to program and can be adjusted for different shift lengths or weekend schedules. In energy-conscious facilities, the ability to avoid unnecessary overnight heating while still having material ready at start-up represents a measurable cost saving.
6. Optional Heat-Air Recycling Device
Conventional hopper dryers exhaust a large volume of still-warm air after it has passed through the material. The optional heat-air recycling system captures a portion of this exhaust air, mixes it with fresh intake air and returns it to the heater. The result is a substantial reduction in the energy required to maintain the set temperature.
Energy savings of 15–30 % are typical depending on ambient conditions and the temperature differential. Over a year of continuous operation, the reduced electricity consumption can offset a significant fraction of the dryer’s purchase price. The recycling circuit is designed so that it does not compromise drying performance; moisture-laden air is still expelled, while the thermal energy is recovered. This feature is particularly valuable in regions with high electricity costs or where companies have set ambitious carbon-reduction targets.
7. Optional Whirly Dust Arrester
Fine dust generated during drying can escape into the workshop atmosphere, creating housekeeping problems, potential health hazards and contamination risks for neighbouring processes. The optional whirly (cyclone-type) dust arrester captures airborne particles before they leave the dryer system.
By keeping the workshop clean, the dust arrester improves working conditions, reduces the load on central extraction systems and helps maintain the cleanliness standards required in medical, food-contact and electronics manufacturing. The unit is compact, requires minimal maintenance and can be retrofitted to existing EXTRUTEX dryers if the need arises after installation.
Applications – Versatility Across Industries
The EXTRUTEX Hopper Dryer is suitable for drying virtually any plastic raw material. Its temperature range and airflow design accommodate both high-temperature engineering resins and more sensitive commodity plastics. Key application areas include:
- Injection moulding – Pre-drying of hygroscopic materials (PA, PBT, PET, PC, ABS blends) to prevent silver streaks, bubbles and loss of mechanical properties.
- Extrusion – Drying of film, sheet, pipe and profile compounds to ensure consistent melt viscosity and surface quality.
- Blow moulding – Preparation of HDPE, PP and PET for bottles and containers where moisture can cause haze or wall-thickness variation.
- Food packaging – Stainless-steel construction meets hygiene requirements for materials that will contact food.
- Medical and pharmaceutical – Clean drying environment for resins used in medical devices and pharmaceutical packaging.
- Electronics and electroplating – Precise temperature control for materials that will undergo subsequent plating or coating processes.
- Multi-material and multi-colour production – Rapid change-over capability thanks to the hinged barrel and easy-clean magnetic base.
Because the dryer can handle materials of different textures, colours and moisture sensitivities simultaneously (within the limits of a single temperature set-point), it is especially valuable for job shops and custom moulders who process a wide variety of resins in relatively small quantities.
How the EXTRUTEX Hopper Dryer Works
Understanding the operating principle helps operators achieve the best results and troubleshoot any issues quickly. Ambient air is drawn into the dryer by a centrifugal blower. The air passes over electric heating elements whose power is regulated by a precise temperature controller. The heated air then enters the stainless-steel barrel through the net-plate dispersion device, flowing uniformly upward through the bed of plastic granules.
As the hot air contacts the material, it absorbs surface and free moisture. The moisture-laden air exits the top of the hopper and is either exhausted or partially recycled, depending on the options fitted. Continuous or intermittent material flow (via a suction box or vacuum loader) keeps the hopper filled, while dried material is discharged from the bottom into the processing machine.
Temperature is monitored by a sensor located in the air stream or material bed. The controller maintains the set-point within a narrow band, typically ±1–2 °C, ensuring that the material is neither under- nor over-dried. Residence time is determined by the hopper volume and the material consumption rate of the downstream machine; larger hoppers provide longer drying times for highly hygroscopic resins.
Technical Specifications
EXTRUTEX offers two main series of hopper dryers. The compact SD series is ideal for smaller machines and laboratory use, while the SHD series covers industrial capacities from 15 kg up to 1000 kg.
SD Series – Compact Hopper Dryers
| Model | Power (kW) | Blower (kW) | Temperature Range (°C) | Number of Trays | Capacity (kg) | External Dimensions (cm) L × W × H |
Net Weight (kg) |
|---|---|---|---|---|---|---|---|
| SD-5 | 6 | 0.75 | 250 | 5 | 45 | 85 × 70 × 110 | 154 |
| SD-9 | 6 | 0.75 | 250 | 9 | 80 | 85 × 70 × 145 | 190 |
Note: The SD series features a tray-style configuration particularly suited for batch drying or materials that benefit from layered air exposure.
SHD Series – Industrial Hopper Dryers
| Model | Capacity (kg) | Heater Power (kW) | Blower Power (W) | External Dimensions (L × W × H) mm |
Seat Dimensions (K × K × J) mm |
Adaptable Injector Shot Weight (g) |
Weight (kg) |
|---|---|---|---|---|---|---|---|
| SHD-15 | 15 | 2.7 | 120 | 660 × 360 × 800 | 120 × 120 × 50 | 30–60 | 28 |
| SHD-25 | 25 | 3.2 | 120 | 725 × 405 × 950 | 155 × 155 × 50 | 60–125 | 38 |
| SHD-50 | 50 | 4.2 | 180 | 840 × 490 × 1070 | 160 × 160 × 50 | 125–500 | 75 |
| SHD-75 | 75 | 5 | 180 | 900 × 550 × 1175 | 160 × 160 × 50 | 500–1000 | 85 |
| SHD-100 | 100 | 7 | 250 | 955 × 605 × 1410 | 200 × 200 × 98 | 1000–1500 | 95 |
| SHD-150 | 150 | 9 | 250 | 960 × 610 × 1560 | 200 × 200 × 98 | 1500–2000 | 120 |
| SHD-200 | 200 | 12 | 400 | 1230 × 770 × 1660 | 200 × 200 × 98 | 2000–2500 | 150 |
| SHD-250 | 250 | 14.5 | 400 | 1235 × 775 × 1790 | 200 × 200 × 98 | 2500–3000 | 170 |
| SHD-300 | 300 | 14.5 | 400 | 1335 × 870 × 1810 | 280 × 280 × 120 | 3000–4000 | 200 |
| SHD-400 | 400 | 18 | 450 | 1360 × 915 × 1870 | 280 × 280 × 120 | 4000–6000 | 225 |
| SHD-600 | 600 | 24 | 960 | 1360 × 950 × 2080 | 280 × 280 × 135 | 6000–8000 | 250 |
| SHD-800 | 800 | 30 | 1100 | 1380 × 1150 × 2250 | 320 × 320 × 135 | 8000–10000 | 300 |
| SHD-1000 | 1000 | 36 | 2200 | 1400 × 1200 × 2600 | 320 × 320 × 135 | 8000–12000 | 360 |
All models are designed to integrate seamlessly with standard vacuum loaders and proportional valves. The “Adaptable Injector Shot Weight” column provides a practical guideline for matching dryer capacity to the shot size of the injection moulding machine, ensuring adequate residence time for thorough drying.
Key Benefits of Choosing an EXTRUTEX Hopper Dryer
- Contamination-free drying – Full stainless-steel product contact surfaces protect sensitive materials.
- Uniform temperature – Net-plate air dispersion eliminates hot and cold spots.
- Fast change-overs – Hinged barrel and magnetic base minimise downtime between jobs.
- Energy efficiency – Optional heat recovery and timed start-up reduce electricity costs.
- Workshop cleanliness – Optional dust arrester keeps the production environment clean.
- Wide capacity range – From 15 kg laboratory units to 1000 kg industrial hoppers.
- European design quality – Austrian engineering standards combined with competitive Chinese manufacturing.
- Easy maintenance – Tool-free access to critical components encourages regular cleaning.
Installation, Operation and Maintenance Guidelines
Proper installation is straightforward. The dryer should be placed on a level, vibration-free surface close to the processing machine. Adequate clearance must be left around the unit for the hinged barrel to open fully and for routine maintenance. Electrical connections must match the local supply voltage and frequency; a qualified electrician should perform the final hook-up and verify earth continuity.
Operation is controlled from a simple panel that displays set-point and actual temperature. Operators select the appropriate drying temperature according to the material supplier’s recommendation (typically 70–120 °C for many commodity plastics, higher for engineering resins). Once the temperature stabilises, material can be loaded and production started. For continuous operation it is advisable to keep the hopper at least half full so that residence time remains sufficient.
Daily maintenance consists of checking the magnetic base for ferrous particles and emptying the dust collector if fitted. Weekly or monthly tasks include inspecting the air filters, verifying that the blower runs smoothly and confirming that all safety interlocks function correctly. The stainless-steel interior should be cleaned thoroughly whenever a material or colour change occurs. Because the design prioritises accessibility, these tasks can usually be completed in a few minutes.
Why Manufacturers Choose EXTRUTEX
In a competitive global market, plastics processors look for equipment that delivers consistent quality, low operating cost and minimal downtime. EXTRUTEX hopper dryers meet these requirements through a combination of thoughtful design and practical manufacturing. The Austrian design heritage ensures that thermal performance, mechanical durability and operator ergonomics are never compromised. The dual manufacturing base in Nanjing and Shanghai provides the capacity to fulfil both standard and custom orders on short lead times while maintaining strict quality standards.
Customers also appreciate the flexibility of the option package. A basic dryer can be specified for cost-sensitive applications, while energy-intensive or high-cleanliness environments can be equipped with heat recovery, timed start-up and dust arresters. This modular approach allows each user to optimise the investment for their specific process conditions.
Finally, EXTRUTEX understands that a dryer is only one element of a complete material-handling system. The company can advise on matching hopper capacity to machine throughput, integrating vacuum loaders and selecting the correct temperature profiles for challenging materials. This application support reduces the risk of under- or over-specifying equipment and helps customers achieve reliable production from day one.
Conclusion – Reliable Drying for Quality Production
Moisture control remains one of the most critical yet frequently underestimated factors in plastics processing. An EXTRUTEX Hopper Dryer provides a robust, energy-efficient and operator-friendly solution that protects material quality, reduces scrap and improves overall equipment effectiveness. With stainless-steel construction, uniform air distribution, rapid access for cleaning and a comprehensive range of optional energy-saving devices, the EXTRUTEX range is engineered for the realities of modern manufacturing.
Whether you operate a single injection-moulding machine or a multi-line extrusion plant, there is an EXTRUTEX model sized to match your throughput and material requirements. Designed in Austria and manufactured in Nanjing and Shanghai, every unit embodies a practical fusion of European engineering excellence and efficient global production.
For detailed quotations, material-specific drying recommendations or assistance in selecting the optimal model for your application, contact the EXTRUTEX technical sales team. Our engineers are ready to help you achieve consistent, high-quality results through properly dried raw materials.
EXTRUTEX – Austria Design • Nanjing & Shanghai Manufacturing
Precision Hopper Dryers for the Global Plastics Industry
Technical data subject to change without notice. Always consult the latest EXTRUTEX documentation for installation and safety requirements.
© EXTRUTEX – All rights reserved.
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