Principle of Pulse Heat Unit (Hot Bar Bonder)

Pulse Heat is Avio’s original process of utilizing resistance heat which is generated by passing an electric current through a metal heating body called a heater chip/heater tool, to instantaneously perform soldering, thermos-compression bonding, and plastic welding with heat and pressure.

Basic Configuration of Pulse Heat Unit (Hot Bar Bonder) and Role of Each Part

The object to be joined is held down and the electric current is flown while the pressure is being applied, and a heat is generated by resistance heating.

Basic flow of the process

  1. Press the heater tip/heater tool (Fig. 1) against the target work to pressurize.
  2. Apply electric current to the heater tip/heater tool to raise the temperature from room temperature to preset temperature while pressurizing.
  3. Hold pressure and heat for the set time.
  4. When the set time is over, the welding is stopped, and when the temperature reaches to the preset cool temperature, the pressure is released.
  5. The heater tip/heater tool return to room temperature. (Fig. 2)
Fig.1 Model of joining by the pulse heat
Fig.1 Model of joining by the pulse heat
Fig. 2 Temperature profile
Fig. 2 Temperature profile

Features of the pulse heat

The temperature control feeds back the temperature of the heater tip/heater tool and accurately reproduces the set temperature profile.

  • The temperature rises quickly and the temperature reproducibility is good.
  • Temperature profiles such as pre/main heat can be easily realized.
  • Due to local heating, the heat effect to the surroundings is small.
  • Since it is cooled while being pressed down, there is no unconnected due to floating.
  • It does not depend on skill level of the worker.

Movie Introducing the Principle of Pulse Heat Unit

  • Please be careful for the volume adjustment as this movie contains sound.

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