PLC controls fire the spray guns at the intended time to match the panel size and the operator-selected pattern width. What little overspray that may occur can be collected at specific points within the machine if desired. Ink thickness control is achieved by first understanding that each LPI material has an optimum spray gun setting. These settings are provided by Teledyne for easy reference. The chosen material is sprayed at its setting with transport speed regulated to control wet thickness applied.
Slower transport adds thickness while a faster transport reduces thickness.
Quality Advantages Entrapment of air is avoided , regardless of conductor pattern and spacing, by the build-up of atomized ink droplets from the laminate out. In addition, reliance on ink rheology to fill voids by flow and debubble is no longer in conflict with building thickness. Spraying inks with a higher thixotrophy allow the material to remain on the conductors and knee. The spray array concept involves the assignment of a small workload to each spray gun in a multi-gun array so as to accomplish a big job in a short time. The work of atomization is shared.