Technidyne is a US-based, family-owned company working to make products, calibration standards and providing services for the worldwide Paper & Allied Industries.
Technidyne will post industry and Technidyne related information on a regular basis. We invite anyone to join the blog and hope that those who read it find it informative and useful.
February 15-18, 2015, Paul Crawford (Business Director - Asia) and I visited our agent in Australia,IDM Instruments. IDM Instruments was established in 1972. It is a
privately owned company, that prides itself with an outstanding reputation as Australia's leading supplier of testing and measuring equipment. This includes working with various companies in foam, packaging, paper, plastics and automotive industries.
Tommy Halmos (IDM) & Todd Popson (Technidyne)
President, Mr. Tommy Halmos,
led our discussion with the staff of IDM. We discussed Technidyne's new products the Color Touch X™ and TEST/Plus™. We also looked at the resources of IDM
and plans for the future. Tommy, Paul and I also made customer visits to several paper and packaging companies throughout Australia. Technidyne has worked with IDM in Australia
for over 10 years. The relationship allows customers in Australia to
use the latest technology in the Paper Industry with extremely good,
local technical support and service.
Thanks to the people of IDM Instruments for their continued good work, hospitality and professionalism.
over 50 years, TAPPI optical calibration has been performed using small
1.5 inch X 2 inch paper 'tabs'. Technidyne is issuing a new format that will consist of a tablet which is easier to handle and will provide more consistent data
since the measurements will come from the same sheet of paper. In past,
it was possible that the tabs were each from a different sheet of
paper. Technidyne customers who subscribe to TAPPI brightness and/or color standards will be receiving standards in this new format in March 2015.
Here are links to two videos showing the use of the new calibration standards with the
These can be found on ourTechnidyne YouTube Channel. When using the new standards format it is important that the standards not be dragged or slid across the instrument sample plate and aperture. This can damage the surface of the standards.
Please let us know if you have comments or ideas on how these will be best implemented. Contact our Lab Manager, Nick Riggs.
The Printing Process:One
of the most important reasons for measuring and controlling surface
smoothness is for print quality. For the contacting-type printing
processes, the ink film will transfer to a paper surface upon physical
contact. When the voids in the paper surface are deep enough prevent
such contact, ink will not transfer to the low spots, and non-uniform
ink transfer causes poor print quality. When the ink film is adjusted to
achieve satisfactory print density on the rough areas of a web, the
same ink film may be too heavy to achieve optimum print quality on the
smoother portions, perhaps causing mottle and other problems. Xerography Processes:
are many reasons why the manufacturers of photocopy machines have
target ranges for Sheffield roughness. A xerographic machine needs
optimum paper surface properties for reliable sheet feeding, image
transfer, and image fix. The fix level decreases as the Sheffield
roughness increases, as it affects toner adhesion. Print density loss is
observed as roughness increases. There also can be image problems with
papers that are too smooth. Toner particles can be flattened and appear
as larger dots, thus increasing the perception of the background.
Rougher papers produce less background. With regards to paper handling,
smoother papers are less stiff for a given basis weight. Smoother papers
increase “electrostatic tacking” in the image transfer process. The
coefficient of friction decreases with increasing roughness, a factor
that is important in sheet transfer operations. The Sheffield roughness
properties are carefully specified for the electrostatic copier printing process. Inkjet printing: Similar
to the photocopy machines, inkjet printers have paper handling
requirements. The method in which a single sheet is transferred from the
supply stack generally relies upon the friction differences in
paper-to-rubber versus paper-to-paper in a stack. In recent years, there
has been development work on optimizing 2-sided surface roughness for
ink jet printers. The printing surface was manufactured to be smooth for
image quality and the back side was rough in order to facilitate paper
feeding and also to avoid excessive contact with a freshly-printed
surface as printed sheets are successively stacked in the printer tray. Related posts include information on the relationship between paper roughness (smoothness) and the following items:
ANSI (American National Standards Institute) has just announced that two new optical standards have been published by ISO TC 6 (pulp, paper and paperboard) for the measurement of tissue.
ISO12625-15:2015 Tissue paper and tissue products -- Part 15: Determination
of optical properties -- Measurement of brightness and colour with C/2° (indoor
ISO12625-16:2015 Tissue paper and tissue products -- Part 16: Determination
of optical properties -- Opacity (paper backing) -- Diffuse reflectance method
These standards have taken a while to be resolved. Experts from the United States and Canada have worked very hard to have these standards accepted by ISO since they are common measurements for tissue products in North America. There was another standard that passed through the ISO system quickly due to partisan support of many European Experts. The addition of Opacity and optical properties with UV Level C were added to complete the standards which reflect the practices and trade requirements of the entire worldwide Paper Industry.
ISO 12625-7:2014 Tissue paper and tissue products -- Part 7:
Determination of optical properties -- Measurement of brightness and
colour with D65/10° (outdoor daylight)
In 1666, Sir Isaac Newton observed that white light is made up of the spectrum of colors. Therefore, giving us the understanding of the Additive Color Mixing. That is when you combine primary lights (blue, green and red) in their highest intensity and equal amounts this results in white light.
When looking at spectral reflectance curves produced from different objects, it can be seen that:
WHITE White is 100% reflectance at all visible wavelengths from 400 to 700 nm. BLACK Black is 0% reflectance at all visible wavelengths from 400 to 700 nm. GRAY Therefore, "straight lines" with equal reflectance at all visible wavelengths from 400 to 700 nm are shades of gray. If the reflectance is nearer to 100%, this is a light gray. Likewise, if the reflectance is nearer to 0%, this is a darker gray. COLORS Not until there is deviation from this "straight line" do we see various colors.
Blue reflectance curve
Here we see a blue reflectance curve. It has reflectance in the blue region of the spectrum (400-500 nm) and very little or no reflectance in the green (500-600 nm) and red (600-700 nm) regions of the spectrum.
Green reflectance curve
Here we see a green reflectance curve. It has reflectance in the green
region of the spectrum, but very little or no reflectance in
the blue and red regions of the spectrum.