Single-Machine Continuous Production
Match usable hopper capacity and dry-air supply to hourly consumption and required drying time. Review conveying cycles and available floor space before selecting an integrated or separate arrangement.
Drying and Dehumidifying System
Topstar drying and dehumidification systems are specifically designed for injection molding applications, providing precise humidity control, stable low-dew-point drying, and contamination-free material handling. These dryers and dehumidifier dryers utilize PID temperature control, energy-efficient airflow design, stainless steel construction, and comprehensive safety features to effectively improve product quality while reducing energy consumption. From standard hot air dryers to advanced three-in-one drying systems and nitrogen dehumidification systems, Topstar offers reliable drying solutions for hygroscopic plastics, optical-grade plastics, and high-performance plastics.
Features
- 1. 3 in 1 compact dehumidifying dryers are equipped with honeycomb rotor which can acquire stable low dew-point drying air.
- 2. To integrate the function of dehumidifying , drying and two-stage conveying into single unit. Three-stage conveying function is optional.
- 3. Double-wall insulated hopper dryers features down-blowing pipe design to avoid heat dispersion for improving drying efficiency.
- 4. Feeding system is equipped with shut-off valve to ensure noremaining material in hopper tube.
- 5. Multiple safety protection device.
- 6. Optical-class models use mirror polished treatment on the material contact surface to avoid material contamination and collocate feeding system with closed-loop in order to avoid the possibility of moisture regain for absorbingoutside air during material conveying.
Application Industries
- 1. Electronics
- 2. Containers
- 3. 3C home appliances
- 4. Cosmetics
- 5. Auto parts
- 6. FMCG
Adequate supply of goods, available for delivery within 35 days.
RESIN PREPARATION
Drying and Dehumidifying Systems Built Around Your Production
A plastic drying and dehumidifying system coordinates dry-air generation, resin heating, residence time and material transfer before injection molding. The right configuration starts with the resin grade, hourly consumption, machine layout and required part quality.
TOPSTAR combines drying, conveying and control components around your process requirements. Review the material path and operating conditions together, then select the equipment and options needed for the application.
How do drying and dehumidifying systems work?
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Condition the Process Air
For hygroscopic resins, the dehumidification unit supplies low-dew-point air. In a desiccant system, a separate regeneration process restores the moisture-removal capacity of the drying medium.
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Dry Resin in the Hopper
Heated process air passes through the resin. Match temperature, airflow and residence time to the material supplier’s requirements rather than applying one drying recipe to every resin.
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Protect and Transfer the Material
Coordinate hopper discharge, conveying and machine feeding. A suitable sealed transfer arrangement helps limit exposure to humid plant air after drying.
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Coordinate Supply with Machine Demand
Assess level signals, conveying requests and operating interruptions so prepared material reaches the injection molding machine at the required rate.
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Monitor Conditions and Verify Resin Moisture
Use available temperature, dew-point and alarm information to track operation. Verify resin residual moisture separately with an appropriate test method; a low air dew point alone does not prove the resin is ready to process.
SYSTEM CONFIGURATION
Configure the Drying System Around Your Production
Evaluate material demand and the production layout before choosing a resin drying system. Machine count, material changes and quality requirements determine how the drying hopper, conveying path and controls should work together.
Confirm the proposed equipment scope, operating limits and optional functions for each project, especially where multiple materials or molding machines share the installation.
Two Materials or Frequent Changeovers
Check whether resins need different temperatures or simultaneous processing. Evaluate hopper separation, cleaning access and material identification alongside a suitable dual-hopper configuration.
Multiple Injection Molding Machines
For a proposed central drying and conveying system, map demand at each machine, material allocation and conveying distance. Confirm distribution, control interfaces and expansion requirements during engineering review.
Optical Parts and Existing-Line Upgrades
For cleanliness-sensitive parts, review filtration and material-contact surfaces. For an upgrade, check existing equipment capacity and interfaces before deciding which components to retain or replace.
Material Requirements That Change the System Configuration
| Material / Quality Requirement | Configuration Considerations |
|---|---|
| PA, PC, PET and PBT grades | Assess low-dew-point drying, temperature and residence time against the specific resin grade and moisture target. |
| PP and PE grades | Check storage conditions and supplier instructions. Non-hygroscopic resins do not automatically require desiccant drying; surface moisture may need separate attention. |
| Optical and transparent parts | Review clean material-contact surfaces, suitable filtration and protected transfer. Define the cleanliness requirement before selecting options. |
| Oxidation-sensitive materials | Assess a nitrogen drying configuration separately, including gas supply and operating requirements, where the application justifies it. |
CAPACITY PLANNING
Match Drying Capacity to Resin Consumption
A resin drying system must provide sufficient drying time while maintaining material supply. Hopper volume alone is not a complete capacity specification.
Start with Throughput and Residence Time
As an initial inventory estimate, multiply hourly resin consumption by the required drying time. Then assess bulk density, usable hopper volume, material flow and the dryer’s operating capacity before selecting equipment.
Illustrative Inventory Estimate
50 kg/h × 4 hours = 200 kg of resin inventory. These assumed values illustrate the calculation only; 200 kg is not a final hopper specification or a guaranteed system throughput.
What Else Must Be Checked Before Sizing?
Confirm the resin grade and bulk density, initial and target moisture, prescribed drying conditions, machine consumption, conveying distance and expected production interruptions. Check the usable inventory and flow behavior as well as the nominal hopper size.
For variable demand, review low-load operation and restart procedures so reduced consumption does not expose the resin to excessive heat or create a shortage when production resumes.
PRODUCTION INTEGRATION
Integrate Drying, Conveying and Machine Feeding
Drying performance must be preserved between the hopper and the injection unit. Coordinate moisture protection, cleanliness, material demand and fault handling across the complete resin preparation system.
Review the material route with TOPSTAR’s feeding and conveying equipment to define the transfer arrangement and installation scope.
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Limit Moisture Re-Absorption
Assess transfer-air conditions, receiver exposure and the route to the machine. Specify sealed or dry-air conveying where needed for the resin and handling conditions.
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Control Contamination and Changeovers
Select filtration and cleanable contact surfaces for the application. Review residual material, discharge points and cleaning procedures when changing resin or color.
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Coordinate Levels and Material Requests
Confirm receiver signals, conveying capacity and machine demand. Define the response to low material levels or interrupted transfer rather than assuming drying capacity alone ensures supply.
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Define Monitoring and Alarm Responses
Agree which temperatures, dew-point readings and alarms are available. Confirm communication, recording and interlock functions against the selected equipment and project scope.
EQUIPMENT WITHIN THE SYSTEM
Select Equipment for Your Drying and Dehumidifying System
Choose the system arrangement first, then compare suitable dehumidifying dryers and hopper configurations. The series below provide starting points for an application review; verify capacity and standard or optional functions on the individual product pages.
Continuous Production with Energy Targets
For continuous production, the TCDHE series combines dehumidification, heat recovery, and variable-frequency control to reduce unnecessary energy use while maintaining the required resin drying conditions.
Precision and Optical Molding
The TCDH series integrates dehumidification, drying, and conveying in one compact unit. Its sealed material path helps prevent moisture re-absorption, while optical-grade configurations meet additional cleanliness requirements for precision and optical parts.
Two-Material Production
The TDA/TDB double-hopper series allows two materials to dry at different temperatures in one compact setup. Separate temperature settings accommodate each material’s drying requirements during two-material production.
Compact Integrated Drying
For installations with limited space beside the molding machine, the TCDE series combines drying and conveying in one compact unit. An insulated hopper reduces heat loss, while enclosed conveying helps protect dried resin during transfer.
Compare TOPSTAR dehumidifying dryers and related drying equipment →
PROCESS VALIDATION
Verify Drying Performance Before Production Approval
Agree on acceptance conditions before commissioning. Check the drying equipment, the resin condition and sustained production together, using the agreed material grade and operating load.
Equipment Operation
Check specified temperatures, airflow, available dew-point readings and alarm responses. Record the operating conditions and the configuration used during the trial.
Resin Residual Moisture
Sample material using an appropriate handling and measurement procedure. Compare the result with the resin supplier’s processing limit and the agreed project requirement.
Continuous Production
Check material supply and molded-part quality at the target consumption rate. Review stoppages and restarts where they form part of the expected production cycle.
SYSTEM PLANNING QUESTIONS
Planning Your Plastic Drying System
Can One Drying System Handle Different Resins?
It depends on the resins, drying conditions and production schedule. Materials needing different temperatures or simultaneous processing may require separate hoppers or drying arrangements. Confirm material separation and cleaning requirements before selecting a shared configuration.
Can a Drying System Be Added to an Existing Line?
An upgrade requires a review of current dryer and hopper capacity, conveying routes, utilities and control interfaces. Provide the existing layout and equipment details so retained components and new equipment can be assessed together.
Does Low Air Dew Point Confirm That Resin Is Dry?
No. Air dew point describes the moisture condition of the process air. Resin moisture also depends on temperature, airflow, residence time and initial material condition. Verify residual moisture using a suitable method and the material supplier’s requirement.
DISCUSS YOUR CONFIGURATION
Plan a Drying and Dehumidifying System for Your Process
Share your material and production requirements with TOPSTAR to discuss the drying, conveying and control configuration for a new installation or an existing-line upgrade.
Material
Resin grade, supplier guidance and current quality concerns.
Production
Hourly consumption, machine count and operating schedule.
Installation
New project or upgrade, layout and available equipment.
If drying settings or moisture limits are not yet known, include the material datasheet and the issue you need to resolve.
Drying and Dehumidification System Series
TCD Series Cabinet Dryer
TDA 3 in 1 Compact Dehumidifying Dryer
TDA Double hopper 3 in 1 Compact Dehumidifying Dryer
TDB 3 in 1 Compact Dehumidifying Dryer
TDB Double hopper 3 in 1 Compact Dehumidifying Dryer
TDH Honeycomb Rotor Dehumidifier
TDN Nitrogen Dryer
THD Hopper Dryer
THD Stainless Hopper Dryer