Advice on measuring with a 75ºgloss meter

UNE-EN ISO 8254-1: 2009

The UNE-EN ISO 8254-1:2009 standard, titled "Paper and board. Specular gloss measurement», collects the working methods for performing gloss measurements.

In particular, Part 1 of the standard refers to "Illuminating with a converging beam at 75 degrees, TAPPI method". . While part 2 of the UNE-EN ISO 8254 standard refers to "75º glossiness for parallel beams, DIN method", part 3 of the rule refers to "glossiness for converging beams at 20º, TAPPI method".

In this way, the measurement conditions need to be defined correctly, since the gloss results are highly dependent on the measurement angle and the type of incident beam (converged or collimated).

UNE-EN ISO 8254-1:2009 states that while the definition of gloss proposed in the standard refers to modes of visual perception, "the methods described use physical measurements of mixed, regular and diffuse reflectance". It added that although "the exact correlation between visual perception and scales established by physical measurements is unknown", this "physical gloss has been shown to be useful for many technical applications and its standardization is therefore justified".

With respect to the object and field of application, the first part of the standard specifies a method for measuring the specular gloss of paper at an angle of 75º with respect to the normal to the paper surface.

Furthermore, the standard indicates that, although its main area of application is coated papers, it can also be used for high-gloss uncoated papers, such as supercalendered papers.