Fully automatic Rollstock vacuum packaging machines are available in a variety of web widths from 285 mm to 459 mm. All the machines feature programmable PLC controls with readable diagnostics and a vacuum leak check program. The chain system is guided and has an auto tensioning system to reduce stretch and wear. Dies are manufactured from solid aluminum block and lifted by a triple-knee level system, driven by a 4-in. air cylinder with variable height control.