“DENN (Industrias Puigjaner, S.A.), founded 1885; over 135 years of building metal forming machine tools.”


DENN: Innovation & Experience in Metalforming

  • standard to fully custom machines
  • modern, fast, safe & flexible
  • reliable construction & components
  • custom & user-friendly software
  • superb surface finishes
  • superb repeatability

DENN Tube (Cylinder) Necking-In & Closing Machines

  • CNC controlled
  • user-friendly and feature-rich interactive graphical CAD-CAM programming system
  • heating systems by induction, torches, friction, …
  • closing process without welding
  • optimized for pressure vessels: aluminum liners, fire extinguishers, SCBA, CNG, accumalator shells, industrial gas cylinders, gas storage cylinders, transportation cylinders, special cylinders, …
  • leak tight and no porosity
  • inert gas minimizes oxidation
  • remote site troubleshooting and programming
  • Ethernet / USB / Networking connectivity
  • Industry 4.0 – DENNdata 
  • preventative maintenance software
  • automatic loading / unloading systems and robotics options
  • devices for faster setups and change-overs
  • safety devices for safe handling – protecting the operator and the machine
  • plus many other options are available to make these machines ideal for countless applications

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DENN Tube (Cylinder) Necking-In & Closing Machines