Mechanical and Chemical Resistance of UV Coating Systems Prepared under Industrial Conditions

Abstract

In the upcoming years, it is expected that more furniture will be built from honeycomb panels due to the growing demand for lightweight, long-lasting furnishings. High-density fiberboard (HDF), previously used in the furniture industry as back walls in box furniture or drawer components, has become a popular facing material used in the production of honeycomb core panels. Varnishing the facing sheets of lightweight honeycomb core boards with the use of analog printing technology and UV lamps is a challenge for the industry. The aim of this study was to determine the effect of selected varnishing parameters on coating resistance by experimentally testing 48 coating variants. It was found that the interactions between the following variables were crucial in achieving adequate resistance: lamp power, the amounts of varnish applied, and the number of layers. The highest scratch, impact, and abrasion resistance values were observed for samples with optimal curing provided by more layers and maximum curing with 90 W/cm lamps. Based on the pareto chart, a model was generated that predicted the optimal settings for the highest scratch resistance. Resistance to cold liquids made with a colorimeter increases with lamp power.

Mechanical and Chemical Resistance of UV Coating Systems Prepared under Industrial Conditions Using LED Radiation

“…Figure 2 displays the process diagram. This work is a continuation of previous research on the mechanical and chemical resistance of coatings cured with mercury lamps [48].…”

“…Better results were obtained with the coating cured with LED+Hg lamp modules. In both cases, the lowest results were obtained for the lowest surface power density of UV Hg [48]. UV acrylic coatings applied via pneumatic spraying were characterized by high resistance to selected cold liquids, except ethanol.…”

“…The authors tested the scratch resistance of the same coating variants in a previous publication (only 48 variants resulted from a lack of differentiation in the surface power density of LED). They found that LED+Hg-cured UV coatings had significantly improved scratch resistance [48].…”

“…The authors tested the impact resistance of the same coating variants in a previous publication. Both LED + mercury lamps and UV mercury and gallium-doped mercury lamp hardening technologies have similar ratings and average impact diameters [48].…”

“…The authors investigated the abrasion resistance of the same coating variants in a previous publication (the lower number of variants stemmed from the absence of distinction in the LED surface power density). The weight loss of coatings hardened with LED+Hg lamps was greater than that of coatings hardened with mercury lamps [48]. Landry et al evaluated abrasion resistance using the Taber Abraser.…”