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Strapping Machines, also known as Banding Machines or Bundling Machines are packaging machines

Ultra-Sonic Banding Machines
The process starts with the strap compressed between the platen and the anvil. There is a vibrator built into either the platen or the anvil, which has teeth; there are also teeth on the opposite component that does not move. The vibrator is quickly vibrated, which creates enough heat to melt the interface between the two bands, through friction. To complete the weld the vibrator is stopped and the pressure held until the joint has solidified. Polypropylene and Polyester banding can also be sealed in a similar manner with the heat being produced by sound in the form of Ultrasonic waves passing through the materials and exiting the molecular structure. They are then compressed as in a heat seal. In ultrasonic welding of plastics, high frequency (15 kHz to 40 kHz ) low amplitude vibration is used to create heat by way of friction between the materials to be joined. The interface of the two parts is specially designed to concentrate the energy for the maximum weld strength.

Heat-Seal Banding Machines
Plastic strap is most commonly joined by melting the straps together by adding heat to the joint. For lighter gauge strap, usually 16 mm (0.63 in) and narrower, heat is introduced with a hot knife system. First, the hot knife moves in between the straps. Then a platen comes up and compresses the straps and hot knife against an anvil on the order of tens of milliseconds. The platen then drops and the hot knife is removed. After the hot knife is completely clear of the straps the platen comes back up and compresses the joint so that the melted portions of the strap mix and harden.