Editorial Technical Reference

Hopper Dryer

This page explains how Hopper Dryer is classified within Rubber and Plastic Product Manufacturing. Technical values and manufacturer relationships are research references; confirm the current specification and supplier evidence for each order.

Technical Definition & Core Assembly

An industrial drying machine that removes moisture from plastic resin pellets or granules before processing.

View Full Specifications Explore Manufacturing Sources
Representative product image. Confirm appearance and specifications with the manufacturer.

Product Specifications

Technical details and manufacturing context for Hopper Dryer

Definition
A hopper dryer is an industrial machine used in rubber and plastic product manufacturing to remove moisture from hygroscopic plastic materials before processing. It consists of a hopper, or storage container, with integrated heating and dehumidification systems that circulate dry, heated air through the material bed. This prevents defects in molded plastic products caused by moisture during extrusion, injection molding, or blow molding processes. The dryer operates by drawing ambient air through a desiccant bed or refrigeration system to remove moisture, then heating this dry air to a controlled temperature. The heated dry air is circulated upward through the plastic material in the hopper, absorbing moisture from the pellets. The moist air is then exhausted or recirculated through the drying system. A closed-loop system maintains consistent dew point and temperature for optimal drying efficiency. Typical hopper dryers have a hopper capacity ranging from 50 to 1000 kg, drying temperatures from 65 to 180 °C, air flow rates from 2.5 to 40 m³/min, dew points from -40 to -20 °C, power consumption from 3 to 45 kW, and drying times from 1 to 4 hours. Temperature accuracy is typically ±3 °C, heating power ranges from 2 to 30 kW, operating voltage from 220 to 480 V AC, frequency from 50 to 60 Hz, and weight from 100 to 1500 kg. Dimensions vary from 800×800×1500 mm to 2000×2000×3500 mm, and noise levels are typically ≤75 dB(A). Materials commonly used include stainless steel (e.g., SUS304 per GB/T 3280), mild steel, and aluminum. These values are reference ranges and must be verified with the manufacturer for specific models. Always confirm model-specific specifications and applicable standards with the legal manufacturer or supplier before procurement.
Working Principle
The hopper dryer operates by drawing ambient air through a desiccant bed or refrigeration system to remove moisture, then heating this dry air to a controlled temperature. The heated dry air is circulated upward through the plastic material in the hopper, absorbing moisture from the pellets. The moist air is then exhausted or recirculated through the drying system. A closed-loop system maintains consistent dew point and temperature for optimal drying efficiency.
Common Materials
Stainless Steel, Mild Steel, Aluminum
Technical Parameters
ParameterTypical rangeNotes & selection driver
Hopper CapacityRequired50–1000 kgMaximum weight of plastic material the hopper can hold
Drying TemperatureRequired65–180 °COperating temperature range for drying plastic materials
Air Flow RateRequired2.5–40 m³/minVolume of dry air circulated through the material per minute
Dew PointRequired-40–-20 °CTemperature at which moisture condenses from the drying air
Power ConsumptionRequired3–45 kWElectrical power required for heating and air circulation
Drying Time1–4 hoursTypical time required to achieve specified moisture content
Temperature Accuracy±3 °CEnsures consistent drying quality.
Heating Power2–30 kWDetermines heating rate and energy consumption.
Operating Voltage220–480 V ACThree-phase for industrial models.
Frequency50–60 HzCompatible with regional power grids.
MaterialSUS304Stainless steel for corrosion resistance.GB/T 3280
Weight100–1500 kgAffects installation and floor loading.
Dimensions (L×W×H)800×800×1500–2000×2000×3500 mmCheck space for installation and maintenance.
Noise Level≤75 dB(A)Lower noise for operator comfort.ISO 3746

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Components / BOM
  • Dryer Body
    The dryer body itself: contains the heated volume and the material passing through it.
  • Hopper
    Storage container for plastic material with insulation to maintain temperature
    Material: Stainless steel or mild steel with thermal insulation
  • Heating Element
    Heats the circulating air to specified drying temperature
    Material: Stainless steel sheathed heating coils
  • Desiccant Bed
    Removes moisture from circulating air using adsorbent material
    Material: Molecular sieve or silica gel beads
  • Blower Fan
    Circulates dry heated air through the material bed
    Material: Aluminum or steel blades with motor housing
  • Control Panel
    Digital interface for setting and monitoring temperature, time, and airflow parameters
    Material: Plastic enclosure with electronic components
  • Temperature Sensor
    Monitors and regulates air temperature within the hopper
    Material: Stainless steel probe with thermocouple
  • Moisture Sensor Optional
    Optional component for measuring residual moisture in plastic material
    Material: Electronic sensor with protective housing

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Hopper Dryer.

Plastic Dryer Resin Dryer Dehumidifying Dryer Material Dryer

Industrial Ecosystem & Supply Chain Structure

Complementary Systems
Downstream Applications
Specialized Tooling

Application Fit & Sizing Matrix

Operational Limits
pressure: Atmospheric to 0.5 bar gauge (7.25 psi)
flow rate: 50-2000 kg/hr (110-4409 lb/hr)
temperature: 40-180°C (104-356°F)
hopper capacity: 25-500 liters (6.6-132 gallons)
moisture removal: 0.02-0.5% residual moisture
Media Compatibility
✓ Polyethylene (PE) pellets ✓ Polypropylene (PP) granules ✓ ABS resin
Unsuitable: Highly hygroscopic materials requiring vacuum drying (e.g., PET, Nylon 6)
Sizing Data Required
  • Required throughput (kg/hr)
  • Initial moisture content (%)
  • Desired residual moisture (%)

Reliability & Engineering Risk Analysis

Failure Mode & Root Cause
Heating element failure
Cause: Thermal cycling and contamination from plastic dust or moisture leading to insulation breakdown or burnout
Airflow restriction or blower failure
Cause: Filter clogging with fine plastic particles, bearing wear in the blower motor, or ductwork obstruction
Maintenance Indicators
  • Unusual grinding or rattling noise from the blower assembly
  • Inconsistent or insufficient drying (e.g., moisture in processed material) despite correct settings
Engineering Tips
  • Implement a strict filter cleaning/replacement schedule based on material throughput and ambient conditions to maintain optimal airflow and prevent overheating.
  • Use a desiccant regeneration program and monitor dew point to ensure the drying air is sufficiently dry, reducing thermal stress on components and improving efficiency.

Indicative industry ranges for design and RFQ preparation. Confirm the exact figures and applicable standard with the manufacturer before specifying.

Compliance & Manufacturing Standards

Applicable Standards
CE Marking (EU Machinery Directive 2006/42/EC) ASTM D4169 Standard Practice for Performance Testing of Shipping Containers and Systems

Quoted from the published standard.

Manufacturing Precision
  • Temperature Control: +/-2°C
  • Moisture Content: +/-0.02%
Quality Inspection
  • Leak Test (Pressure Decay Method)
  • Material Composition Verification (XRF Analysis)

Manufacturers of Hopper Dryer

1 company lists this product among what they make. Company figures are quoted from each company's own website; every card states where the relationship came from.

Dongguan Jiusheng Machinery Co., Ltd.
Guangdong, CN
Also makes: Temperature Controller, Heat Exchanger (Cooling Tower/Plate), Fan (Air-Cooled)
Listed on the company's own website · profile compiled by CNFX from public sources
View profile Send enquiry

Manufacturer listings support early research and capability understanding. They are not certification, ranking, or transaction guarantees.

Technical documentation
Request current drawings, revision history, and a signed specification sheet.
Manufacturing capability
Verify equipment lists, process limits, capacity, and representative production evidence.
Inspection readiness
Confirm test methods, calibrated equipment, sampling plans, and traceable reports.
Supplier transparency
Check the legal entity, factory address, ownership, certifications, and direct contacts.

CNFX does not score or rank suppliers. Buyers must verify all claims and documents with the legal manufacturer before ordering.

Supply Chain Commonly Integrated Components

Cooling Unit

A component within an Automated Mold Spraying and Cooling System responsible for rapidly reducing mold temperature after spraying operations.

Explore Specs →
Infrared Heating Zone

A specialized heating section within an automated mold preparation station that uses infrared radiation to preheat molds to optimal processing temperatures.

Explore Specs →

Frequently Asked Questions

What is the typical hopper capacity range?

The hopper capacity typically ranges from 50 to 1000 kg, depending on the model. Verify the exact capacity for your specific unit with the manufacturer.

What drying temperatures are commonly used?

Drying temperatures typically range from 65 to 180 °C. The optimal temperature depends on the plastic material and moisture content; consult the material supplier or dryer manufacturer.

How does the dryer achieve low dew points?

The dryer uses a desiccant bed or refrigeration system to remove moisture from the air, achieving dew points from -40 to -20 °C. This ensures effective drying of hygroscopic materials.

What maintenance signals indicate a problem?

Signs of inadequate drying include increased moisture-related defects in molded parts, longer drying times, or inconsistent temperature readings. Regularly check and replace desiccant, clean filters, and verify heater and blower operation.
Data basis: editorial classification, named public sources where available, and source-reviewed manufacturer records. See the editorial policy.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records.

Preliminary Technical Classification
This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.
Buyer enquiry

Request manufacturing insight for Hopper Dryer

Ask for use case, specification boundaries, supplier type, and RFQ preparation information for this product.

Where it goes
Straight to the CNFX editorial desk, and to the manufacturer if this product is linked to a claimed profile. Nothing is broadcast to a supplier list.
Your details stay here
We do not sell or rent enquiry data, and we do not add you to a mailing list. Used only to answer this request.
No commission, no middleman
CNFX is a directory. We take no cut of any order and never negotiate on a supplier's behalf.
What we don't claim
A listing is not an endorsement. Qualify every supplier and verify every figure yourself before ordering.

Your business information is used only to process this request.

Thank you! Your message has been sent. We'll respond within 1–3 business days.
Sorry, we couldn't send your message. Please try again, or email us at contact@cnfx.com.

Need to Manufacture Hopper Dryer?

Compare manufacturer profiles with relevant product and process capability.

Create Manufacturer Profile Contact Us
Previous Product
Spray Manipulator
Last Product
Get QuotesChat