1、 The necessity of heating
High frequency electric field heat generation mechanism
When the high-frequency machine is working, the high-frequency electric field (usually 27.12MHz) causes the polar molecules of materials (such as PVC, TPU, leather, etc.) to move at high speed and generate heat through friction, ultimately reaching the temperature required for welding or embossing. This process relies on the conversion of high-frequency energy into thermal energy, with heating being the core step.
Material property adaptation
For non-metallic materials such as plastics and synthetic leather, traditional heat conduction methods are difficult to quickly penetrate the interior of the material, while high-frequency heating can achieve deep penetration of the material, ensuring uniform and firm embossing.
2、 Heating process implementation
Equipment heating device
High frequency oscillator: generates a high-frequency electromagnetic field through high-voltage rectification self-excited electron tubes, triggering molecular polarization and heat generation inside the material.
Temperature control system: Some models are equipped with a stepless temperature control device, which can adjust the heating temperature according to the material thickness and pattern complexity (generally 100-170 ℃).
Mold assisted heating
Thermal conductivity of molds: Copper or aluminum molds are commonly used due to their excellent electrical and thermal conductivity, which can quickly transfer heat energy and maintain temperature stability.
Mold design: Adjust the mold shape according to the embossing effect (such as Deboss concave or Emboss convex), and use heating to achieve three-dimensional texture.
3、 Heating safety and operation points
Preheating requirements
The vacuum tube needs to be preheated for 10-15 minutes to ensure stable high-frequency output and avoid equipment damage.
Temperature control
Adjust the heating time according to the material (such as operating in increments of 30 seconds to 1 minute) to prevent discoloration or carbonization caused by overheating.Hf Bullet Proof Vest Welding Machine
Insulation protection
Insulation should be placed between the upper and lower molds during homework to prevent direct contact from causing short circuits or sparks.High Frequency Welding Equipment
4、 Application scenarios and advantages
Applicable materials: thermoplastic materials such as PVC, TPU, EVA, leather, etc.
Efficiency advantage: High frequency heating speed is fast, and embossing can be completed within seconds, especially suitable for mass production.
Environmental friendliness: Compared to traditional heating processes, high-frequency heating has lower energy consumption and does not require chemical adhesives.Clothing Embossing Foot High Frequency Welders
In summary, heating is an indispensable part of high-frequency embossing, and its technical characteristics and equipment design revolve around the generation and control of thermal energy.