Drive: Creates initial force or thrust
Material Containment: Holds the material in bulk, sausage or cartridge
Nozzle: Reduces material to desired width
Mechanism that creates force or thrust. There are three drives available:
Contains the material to be dispensed.
Determines the size and shape of the material to be dispensed.
The FORCE from the drive creates PRESSURE on the material in the barrel; the piston in the barrel moves the material. SO, as the barrel diameter and piston increase in size, the internal pressure on the material naturally drecreases.