The following diagram is the sealing head unit assembly we used in a big project. I borrowed this information from our R&D department for your reference. The final customer is one for copper coil production group. The machine is for strapping copper coils. Their products would be very similar with yours.
Slide Table Group
Sealing Head Frame Group
The main strapping process: Feed strap → Form a strap circle → Loading product in position → Tension strap → Heat strap → Seal & cut strap → Next circle
Usually the coil strapping machine with sealing head unit is buried in the box.