- Series: high-frequency powder preheating machine
- Typical use: preheating melamine, urea, phenolic and thermosetting powder before compression molding
- Material scope: powder compounds for tableware and thermoset molding
- Power range: 3 kW, 5 kW, 7 kW, 10 kW and 25 kW classes
- Main advantages: high-frequency powder heating, batch-weight matching, timed heating control and press-line integration
- CE certification available for export projects
High Frequency Preheating Machine
A high-frequency preheater heats melamine, urea, phenolic and other thermosetting powders before mold loading. It sits upstream of the compression press and does not perform clamping or holding pressure.
Preheating depends on charge weight, power, heating time and transfer distance. The shorter the wait between heating and mold loading, the easier it is to connect both steps.
Production advantages of high-frequency preheating
- Heats powder before molding to improve its starting flow and curing condition.
- Power classes from 3 kW to 25 kW cover different charge weights.
- Timed heating is set around material, thickness and transfer distance.
- The unit can feed HCB, HCE, HCM and other thermoset compression presses.
Machine Functions and Molding Control
The high-frequency preheater controls powder temperature before mold loading through power and timed heating, then works with press opening, transfer and loading time so the heated charge moves directly into molding. The preheater’s production role is to prepare the next powder charge before the press opens. When power, timer setting and transfer distance are coordinated, the heated charge reaches the mold promptly instead of losing useful heat while waiting.
Powder is heated in its container before transfer to the mold, improving the starting point for flow and curing.
Larger charges normally need more power or time, so the actual weight per cycle should drive selection.
Time is set by material, part thickness and transfer method so each charge reaches the mold in a similar condition.
Heating, transfer, loading and press opening are arranged as one sequence to carry the preheating effect into molding.
Preheating capacity from 3 kW to 25 kW
The 3, 5, 7, 10 and 25 kW classes cover different powders and charge weights. Han Chang matches power to heating time, transfer distance and downstream press capacity.
For smaller charges, trials, lighter tableware and small thermoset parts. Lower power suits light charges and development work. Han Chang checks the actual heating time so each charge can be ready before the downstream press requires it.
Common for melamine tableware with heavier charges or thicker products. This power band covers common tableware charges; part thickness, compound response and transfer time determine whether 7 kW or 10 kW better matches the process.
For larger charges or higher output, with downstream press and power supply checked together. The 25 kW class supports larger charges or greater preheating capacity, with equipment position, power supply, guarding and the downstream press’s ability to consume each charge planned together.
| Performance / Model | 3 kW preheating model | 5 kW preheating model | 7 kW preheating model | 10 kW preheating model |
| Performance / Model | 25 kW preheating model |
How preheating power supports press production
Han Chang uses powder type, charge weight, part thickness, transfer time and downstream press opening time to match power, connecting preheating, loading and compression as one production sequence.
Material response and the amount used per cycle determine the required power and heating time.
Heavier charges and thicker parts can benefit from improved powder flow and an earlier curing start before entering the press.
A short route from preheater to press retains more of the heating effect before mold loading.
Preheating completion works with press opening, loading and daily output so both machines contribute to the production cycle.
- Powder type, charge weight and part thickness connect the material to power and heating time.
- Current heating method and transfer distance connect the unit to equipment position and loading flow.
- Downstream press, opening time, output and voltage connect preheating to line timing and power supply.
Preheater service focuses on heating and electrical control
When heating time or powder condition changes, Han Chang reviews power output, timer control, electrical status, charge weight and transfer method first.
Screen photos, alarms, heating time and before/after powder condition help with diagnosis. Service engineers compare power output, timer setting, charge weight and the condition after heating to separate a material-response change from an electrical or operating issue.
Preheating completion is checked against press opening and loading action. Heating too early creates waiting, while heating too late leaves the press idle. The review places preheating, transfer, loading and press opening on one timing sequence.
Taiwan and Mainland China teams assist with operation, electrical checks and parts identification. Both regional teams can use the same model, power, electrical and alarm records for remote diagnosis, parts identification and maintenance follow-up, reducing repeated fact-finding.
CE certification is available according to power, electrical and safety specification and destination. High-frequency electrical control, guarding and export documents follow the ordered power and safety configuration; CE content is based on the specification of the delivered unit.
High Frequency Preheating Machine FAQ
Can a preheater replace the molding press?
No. The preheater heats powder before loading; HCB, HCE, HCM or another press still performs clamping, degassing, holding and curing. After preheating, the charge still enters a molding press where the mold, heated platens, degassing and hydraulic holding pressure complete the final thermoset forming process.
Which materials can be preheated?
Melamine, urea, phenolic and other suitable thermosetting powders can be evaluated. Results depend on compound and charge weight. Compounds do not respond identically to high-frequency energy. Han Chang evaluates powder type, charge weight and the before-and-after condition when establishing power and time.
How is preheater power selected?
The 3, 5, 7, 10 and 25 kW classes are matched to powder type, charge weight, heating time, transfer distance and downstream press capacity. Power selection considers both charge size and the rate at which the press uses material. Higher power alone cannot improve total output when it is not coordinated with the downstream cycle.
What production advantages does preheating provide?
Preheating improves powder flow and the starting point of curing before mold loading. Proper power, time and transfer can shorten the temperature-rise stage inside the press. The charge reaches the mold with a higher and more even starting temperature, reducing time spent only raising powder temperature inside the press; the result still depends on compound, thickness and transfer.
How does Han Chang configure a preheater?
Powder, charge weight, part thickness, downstream press, transfer distance, output and voltage data allow Han Chang to match power, timing and machine position. Han Chang converts these conditions into recommendations for power, timer setting, equipment position and electrical supply, then checks that completion time matches press opening and loading.
