By Robert Rae, managing dir.-Sales; Ryan Turner, R&D engineer; and Jennifer Heathcote, business development mgr. GEW Editor’s Note: Part 1 of this technical paper (CQ 2021 Q3, page 41) covered various countermeasures for oxygen inhibition, and inert-chamber components and their operation. UV-curing system The emitted wavelengths and UV dose incident on the coating … [Read more...] about Role of inert chambers and system maintenance in UV curing of silicone-release coatings: Part 2
2021 Quarter 4
Fifty years of web-handling mistakes (Part 3): Camber webs, roller surfaces & troubleshooting
By Ron Lynch, president/owner, R J Lynch & Associates After almost 50 years involved with web-handling and consulting, I have seen a few mistakes. I must confess, for the first 15 years, I was an untrained hack and made many of them myself. Here are some of the mistakes I have seen and made as they relate to cambered webs, roller surfaces and troubleshooting, along with … [Read more...] about Fifty years of web-handling mistakes (Part 3): Camber webs, roller surfaces & troubleshooting
Molecular functionalization of thicker polymer surfaces
By Frank Förster, Ph.D., head of process development for atmospheric-pressure plasma, SOFTAL Corona & Plasma GmbH Atmospheric-pressure plasma is highly suitable for treating the surfaces of thermally sensitive polymers. This method also can process materials of any desired thickness and offers a replacement for wet-chemical adhesion … [Read more...] about Molecular functionalization of thicker polymer surfaces
The effects of surface treatment at the coating-head interface
By Mark Miller, CEO, Coating Tech Slot Dies LLC Introduction Typically, when you coat a fluid out onto a substrate, the fluid flows to the limits of the coating head and provides a solid layer of fluid over the substrate. Sometimes, however, the fluid resists this reformation and coating defects occur. Pinholes, ribs and beading-up of the fluid are common when the fluid … [Read more...] about The effects of surface treatment at the coating-head interface
A guide to setup procedures for an improved slitting process
By Dave Rumson, slitting educator and consultant Over the course of my 32-plus years of slitting and winding process observations, educational programs and consultant consultations, I have collected a list of more than 40 winding and slitting tips, tools and pertinent slitting-knife geometric and dynamic setup factors that affect the razor-, crush- and shear-slitting … [Read more...] about A guide to setup procedures for an improved slitting process