Proper Temperatures for Flash-Cure Units

Joe Clarke has spent the past 47 years in the lab and in the engineering department, in pre-press and on-press, as an R&D / technical researcher and as a manager of screen print production. Clarke has held executive positions as President of M&R Printing Equipment and as Vice-President at Wilflex [Poly One]. He has been granted a growing number of print-related patents, including one for High-Shear printing with Smilin'Jack - he is a member of the ASDPT, is an Associate Editor for NBM and an SGIA Fellow.

Clarke has presented hundreds of technical papers, written a couple books and published over 600 technical / management articles for which he has been awarded five Swormstedts; the international standard for excellence in technical writing.

Currently Joe Clarke is the President of CPR, a Chicago-based corporation which manufactures Synergy Inks including NexGen; environmentally & financially responsible T-Shirt inks. For more information on CPR, visit

Flash-cure units, regardless if they use panels or bulbs, should be considered an extension of the dryer. Specifically, at a given dryer temperature and speed, the exit temperature with a PFP on a 150/48 might be 280 degrees F when the shirt was laid on the belt at room temperature. If the same shirt and ink were pre-heated with a flash-cure unit, then the exit temperature will increase, to say 300 degrees F.

Of course, the print temperature should achieve the exit temp right before the garment exits the heating chamber. The bleed-resistant ink required in this context will have a minimum fusion temp of 275 degrees F and a maximum temp of 305 degrees F to restrain sublimation.

The specification might be 290 degrees F but the far more critical tolerance would be 275 degrees F to 305 degrees F.