• What are the TTPs of processing?

  David Roisum, Ph.D., Consulting Technical Editor, February 1, 2010
  The acronym TTP stands for time, temperature and pressure. Many processes, both chemical and physical, are nicely captured by those usually interchangeable parameters.  More

• Web Works: How should I combat core crush?

  David Roisum, Ph.D., Consulting Technical Editor, September 1, 2009
  Core crush is not a single defect but rather three distinctly different defects. True, they all have the same outcome, the core gives way, and increasing core strength is a possible treatment. However, we should first consider lower-cost options...  More

• Wound-roll telescoping: What causes it? Part 2

  David Roisum, Ph.D., Consulting Technical Editor, August 1, 2009
  The telescope described in last month's column is probably the most common. It was defined by a fingerprint observation of MD slippage that precedes and allows CD slippage. In this month's cases, there will there be no shift of the radial line struck on the side of the roll. Type II telescoping is common with products that have a viscous coating.  More

• Wound-roll telescoping: What causes it? Part 1

  David Roisum, Ph.D., Consulting Technical Editor, July 1, 2009
  Telescoping is not a single defect but a collection of largely unrelated defects that use the same name.  More

• Roller release: How can I improve it?

  David Roisum, Ph.D. Consulting Technical Editor, June 1, 2009
  Sticky or tacky materials, such as coatings and adhesives, can cause enormous operational and runnability headaches. At the modest level, the tacky coating causes a delayed tangent of the web as it departs from the roller (or wound roll). This will quite likely upset the surface of the coating.  More

• Roller traction: How can I improve it?

  David Roisum, Ph.D., Consulting Technical Editor, May 1, 2009
  Traction is as important in web handling as it is in driving your car. Without traction, you lose control of braking, steering, speed and other vital concerns. In either case, losing traction is an invitation to a crash. It matters little whether the loss of traction is on the driven or undriven rollers (wheels).  More

• Helper drives: What are they and how do they work?

  David Roisum, Ph.D. Consulting Technical Editor, April 1, 2009
  One way to think of a helper drive is as a poor man's dancer or load-cell tension control. However, it's not always the case that we can't afford load cells; it's more often the case that we can't fit them in, literally. There's no space for a sensor, or we don't want to make the space by adding rollers that are needed to set up the geometry of a dancer or load cell.  More

• Master-speed reference: What is it?

  David Roisum, Ph.D. Consulting Technical Editor, March 1, 2009
  Most web machines have one and only one master-speed reference. This master drive is the timekeeper/pacer of all other drive motors and elements in the line. When the master moves, everyone else must move. When it comes to a stop, everyone else must stop. It's the one drive that directly follows the speed command input by operators.  More

Next ›

• Resource Center
• Browse Categories
• Browse Companies

Featured Company

• Kodak

  

  Kodak has manufacturing operations in North and South America, Europe, and Asia, and Kodak products are available in virtually every country across the globe... more

---

Most Recent Resources

• Kodak Expert Advice on Choosing a CTP System
• Meet Stream Inkjet Technology – Offset Class Output from Kodak