Energy Saving High Frequency Melamine Preheater For Bowl Plate Molding

The Energy Saving High Frequency Melamine Preheater is professional preheating equipment specially designed for melamine molding compound (MMC powder) before hydraulic compression molding. In the traditional melamine production process, melamine powder is fed into the mold at room temperature. This requires a long heating cycle inside the press, leading to high energy consumption, uneven curing, longer molding time and a higher reject rate.

Adopting the high-frequency dielectric heating principle, this preheater heats the melamine powder uniformly from the inside out in a short time. The preheated MMC material maintains a stable and consistent temperature before loading into the mold. It significantly shortens the pressing cycle, improves the fluidity of the melamine compound and reduces defective products such as bubbles, cracks, lack of material and flow marks on bowls, plates, cups and other melamine tableware. Featuring an optimized circuit design and energy-saving structure, it is widely matched with four-column hydraulic melamine presses, automatic weighing machines and edge grinding machines to form an automated melamine tableware production line. It is the ideal upgrading equipment for melamine factories that pursue higher output, lower power cost and stable product quality.

1. High-Frequency Uniform Internal Heating, No Temperature Difference — Unlike ordinary surface heating methods, high-frequency dielectric heating generates heat directly inside the melamine powder material. The temperature distribution across the whole powder pile is even, avoiding the common problem of an overheated surface while the core remains cold. After preheating, the melamine compound has excellent fluidity and can fill every corner of complex mold cavities smoothly. This greatly reduces molding defects for deep bowls, patterned plates and multi-compartment divided trays.
2. Energy-Saving Design, Lower Production Electricity Cost — The upgraded high-frequency oscillation circuit and high-efficiency resonant structure reduce invalid power loss. Compared with old-generation preheaters, it cuts power consumption noticeably for the same output. Since the material is preheated in advance, the hydraulic press does not need to maintain high-temperature heating for a long cycle. The overall power consumption of the whole molding workshop is reduced, bringing continuous cost advantages for mass production.
3. PLC Intelligent Control & Precise Temperature Adjustment — Equipped with a PLC system and touch screen operation panel. Users can set target temperature, heating time and power according to different grades of melamine powder (A1 / A3 / A5). The system monitors temperature in real time and automatically adjusts high-frequency output power to keep the heating temperature stable. Parameter recipes can be saved for different products, so operators can quickly recall programs when switching between bowls, plates and other tableware specifications. It also features automatic timing, stop function and fault alarm prompts.
4. Short Heating Cycle, Boost Production Capacity — Fast heating response, reaching the preset temperature in only a few seconds. After preheating, the required hot pressing time in the hydraulic machine is shortened remarkably. A single press can complete more molding cycles per hour, improving the overall output of the production line without adding extra presses. It is very suitable for factories with large bulk orders of melamine dinnerware.
5. Wide Compatibility with Various Melamine Raw Materials — Perfectly compatible with A5 food-grade melamine molding compound for tableware, and also works stably with A3 and A1 melamine powder. It supports preheating for different weight portions matched by automatic weighing machines, covering raw materials for small cups, medium bowls and large dinner plates. One machine can serve multiple product types in mixed production.
6. Reliable Multi-Layer Safety Protection System — Built-in over-temperature protection, over-current protection, short-circuit protection and a door interlock safety switch. Once abnormal conditions occur, the equipment automatically cuts off high-frequency output to avoid accidents. The fully enclosed high-frequency shielding structure effectively reduces electromagnetic leakage, complying with industrial safety standards. The whole machine is equipped with an emergency stop button for quick shutdown in case of emergency.
7. Stable Continuous Operation & Easy Maintenance — Heavy-duty frame structure for stable operation during long continuous working hours. Core electrical components adopt well-known brand parts for stable performance and long service life. The cavity is easy to clean, and residual melamine powder can be removed conveniently. Spare parts are universal and easy to purchase. We provide a complete operation manual, wiring diagram and online technical guidance.

1. The automatic weighing machine weighs a fixed quantity of melamine molding powder.
2. Place the weighed MMC powder into the heating cavity of the high-frequency preheater.
3. Close the safety door and start the heating cycle on the touch screen.
4. The high-frequency system works and heats the powder evenly from the inside.
5. When the preset temperature and time are reached, the machine stops heating automatically.
6. Open the door and take out the preheated melamine powder quickly.
7. Send the hot material into the mold of the hydraulic press for compression molding.
8. The press completes hot pressing and curing, then opens the mold to take out the blank.

This preheater is indispensable supporting equipment for melamine tableware production lines. It is widely used for making melamine bowls, dinner plates, dessert plates, cups, divided trays, spoons, children's melamine tableware, school canteen ware, hotel catering melamine dinnerware and promotional gift melamine products. It can be combined with melamine powder, a hydraulic molding press, an automatic weighing machine, an edge grinding machine and melamine decal paper to realize full-process production.

The main body is wrapped with anti-collision foam and stretch film. Standard export fumigation-free wooden case packing is used for sea freight. The control cabinet, cables and spare parts are packed separately. We can print shipping marks as requested by the customer and provide loading photos before delivery.