How does a hot glue gun work?

The hot melt adhesive is pressed into the melting chamber through the rear stick feed. By pulling the trigger, the stick is pushed over the transport carriage into the heated melting chamber to be melted.

The melting chamber is heated by the adjacent heating cartridge. When the trigger is activated, the teeth of the transport carriage grab into the stick, push it further towards the nozzle and at the same time prevent it from slipping back.

The seal on the melting chamber ensures that the melted adhesive does not run back down the stick and into the device. The feeding movement of the cold stick increases the pressure in the melting chamber so that the integrated ball-spring system of the nozzle clears the way for the hot glue.

When the pressure decreases, the ball closes the nozzle again, preventing the hot melt adhesive from dripping out.