Printing Newsletter april 2021

April 2021

IR TEMPERATURE SENSORS CLEVERLY CLOSING THE QUALITY GAP BETWEEN INDUSTRIAL INKJET PRINTER AND PRODUCTION SPEEDS

A global technology company focused on print and advanced materials & chemicals was set to come up with a revolutionary new inkjet-based digital printing press, to once and for all close the quality gap with offset at production speeds.

New industry standard

This multinational focused to take inkjet to the next level in a clever way, putting the bar extremely high by their specification of

View the complete Case Study here

INFRARED FIXATION ON LARGE FORMAT PRINTERS

Flags, carpet, tiles and everything else that is printed on Large Format Printers with protective paint needs to be completely dried, cured or fixated before the end-products can be cut, folded, or otherwise worked on. Depending on the paint, most of the inks are water based and short- or middle wavelength IR lamps can be used for drying. Many of these processes are performed at low speed and at low temperatures, so the surface temperature of the printed material will change very slowly and the entire process will take a long time. Other challenges that often occur is that the end-quality is unpredictable since operators don’t know when the printed material is dry.

The Optimal Solution

The use of infrared temperature measurement methods in production processes is limited to material surfaces and thus has serious limitations in thermal process monitoring, particularly when speed increases are factored in. However, the right Infrared Non-Contact Temperature Sensor that can work at a speeds up to 50msec, will enable high speed curing, drying or fixation at high temperatures. Non-contact IR sensors also ensure the highest quality results with little to no processing errors and therefore less wasted material and less energy usage.

View the complete Application Note here

Speeding up offset, digital, inkjet drying processes

For high speed printing processes, the limiting factor on the productivity of the equipment is usually ink drying time. To maximize printing speed without quality loss, it is important to be able to determine quickly when the printed substrate is sufficiently dry or fused.

The surface temperature of a “wet” substrate will change (rise) very slowly as constant heat is applied to the product. This occurs because the moisture in the substrate absorbs much of the heat energy as it evaporates.

At the point that the substrate becomes ‘dry’, however, the same constant heat supply will quickly raise the temperature until it reaches the same as the surrounding air.

The ability of the measuring device to maintain its calibration under service conditions and over a long period of time is of fundamental interest in temperature control. The IRt/c is rated at less than 0.1°C repeatability and has no measurable long term calibration change, which makes it well suited for reliable temperature control. These attributes are inherent in the basic design and construction of each IRt/c.

Repeatability is defined as the ability of a measuring device to reproduce its calibration under identical conditions. The IRt/c is a solid, hermetically sealed, fully potted system that does not change mechanically or metallurgically during service. There are no active electronic components and no power source to produce the signal – only the thermoelectric effects that produce a thermocouple signal. Long term accuracy is influenced by the same things that influence repeatability: mechanical changes and metallurgical changes. It is well known that thermocouples can change calibration over time due to these effects.

View the complete Application Note here