Vello Process

The Vello process has a production capacity greater than that of the Danner process but based on a different principle.  In general, the Vello process is better for high production applications, while the Danner process is ideal for precise, small-batch tube orders.

Glass flows from a furnace fore-hearth into a bowl in which a hollow vertical mandrel is mounted, or a bell surrounded by an orifice ring. The glass flows through the space between the bell and the ring and travels over a line of rollers to a drawing machine up to 400 feet away.

Tubing is made by blowing air through a bell with a hollow tip and rod is produced by using a bell with a solid tip. The dimensions of the tubing are controlled by the glass temperature, the rate of draw, the rate of the draw-off, the pressure of the blowing air, and the relative dimensions of the bell and ring.

The draw-line cools the tube and allows it to travel straight to cutting and other processing at the end of the line. 
BPS Cut Sheet
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Bell Positioning
  • Three (3) to Five (5) Axis Control
         Five axis control requires servo motors
  • High Temperature and Precision Ball Screws and Linear Slides
  • Servo or VFD Motion
  • Graphical HMI
  • Remote Control/Feedback
  • Water Cooling
  • Modular Frame Design
  • High Temperature Aluminum Paint
  • Dual-Self Centering Chucks
Drawline
  • Adjustable Roller Catenary
  • Vacuum Boxes
  • Adjustable Runway
  • Air driven carbon Rollers
  • Heat Retention Covers

Puller & Cutter
Puller
  • Kevlar & Silicone Belts
  • Multiple Wheels
  • Tension Control
  • Twist Control
  • Tube Guides/Aligners
Cutter
  • Servo Driven Profiling
  • On-the-fly Length Adjustment
  • Cut Speed Synchronization
  • Air, Electric, & Servo Cutter Motors
  • Wet, Saw, & Chop Cuts
  • Adjustable Tension Support
  • Tube Guides/Aligners
Tube Handling
  • Spray Coating Systems
  • Rotary & Pneumatic Thunkers
  • Belt & Pkt-to-Pkt Transfer Conveyors
  • Maverick or Reject Gate
Trimming & Glazing
Trim
  • Wet wheel trim
  • VFD or Servo driven wheels, belts, and width adjustment
  • Air Purge for Glass Chips
  • Trim burner mixer and ignition with flame safety monitoring system
Glaze
  • Air/Gas & Oxy/Gas glazing, pre-heat and anneal burners
  • Glaze burner mixer and ignition with flame safety monitoring system
Packaging
  • Shrink wrapped or custom packaged bundles
  • Auto adjust setup for OD, bundle/package configuration, and tube length
  • Machine guarding and safety systems
Palletizing
  • Stack bundled/packaged tubes on multiple pallet locations
  • Insert cardboard/paper between layers
  • Machine guarding and safety systems
  • Fully automatic Pallet Stretch Wrapping or Shrink Bagging
  • Fully automatic Pallet Banding
  • Pallet Dispensing
  • Case Erection and Sealing
On-Line Tubing Control
On-Line Gauging
  • Diameter
  • Wall Thickness
  • Knot/Stone/Rough Detection
  • Air Line Detection
Closed Loop Control
  • Inflation Air
  • Pulling Speed
  • Catenary/Pull
  • Graphical HMI
  • Data Logging and Trending
  • Recipes
  • Reports
Reject/Maverick Tracking & Sorting
  • OD/Wall Specification Limits
  • Knots/Stones/Airlines
  • Reject/Sorting
  • Production Tracking
On-Line Vision Tieback
  • Diameter Shrink Correction
  • Wall Thickness Adjustment
  • Pull Stabilization
  • Air Line Detection
Vision Inspection and Gauging
Tubing End Quality
  • Broken Ends
  • Cracks and Chips
  • Glaze Quality - Adhered Glass
Design Details
  • Cognex/DVT Vision Systems
  • Diffuse Backlighting
  • PLC Machine Interface
  • Graphical HMI
  • Production and Reject Tracking
  • Job Setup/Recipes
  • Data Logging and Trending
Tubing End Gauge
  • Diameter/Wall
  • Eccentricity/Siding
  • Min/Max Glaze