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Thursday, October 31, 2013

Pulp Inspector Features Color Touch for Pulp Measurement

A Technidyne Color Touch PC has been operating in a new Techpap Pulp Inspector at Fibria Celulose, Aracruz Mill, in Brazil since July 2013.

The Techpap PulpInspector is an automated pulp testing device. It has the capability of:
  • Fiber morphology
  • Canadian Standard Freeness (CSF)
  • Dirt & shives
  • Handsheet making
  • Grammage
  • Brightness
  • Color
  • Whiteness
  • Fluorescence
  • ERIC 950 residual ink
The particular unit in Brazil has the basic handsheet forming and grammage measurement with the addition of the optical properties tests through the use of the Color Touch.

Please contact us if you have questions about the PulpInspector or other Techpap products.

Monday, October 28, 2013

Paper Roughness (Smoothness): Part 1 - Terminology

Terminology:
The terms “smoothness” and “roughness” are generally well understood as far as a dictionary meaning goes; however, the use of the terms in test methods is sometimes confusing. In the title of a test method, the term “smoothness” is used when an increasing number is correlates with a smoother surface measurement. An example of this would be the Bekk method, where a smoother surface requires more time for a given volume of air to leak across the surface. Since the reporting for Bekk smoothness is in units of time (seconds), a surface that measures 500 Bekk seconds is smoother than a surface that measures 200 Bekk seconds. If the Bekk instrument was originally configured to report in Bekk flow, which is the reciprocal of Bekk time, then the test methods would categorize it as a Bekk roughness tester.

The two most common instruments that directly report airflow across the surface are the Sheffield and Bendtsen methods. A rougher surface causes higher airflow; therefore these instruments are designated as roughness testers. The Parker Print Surf method is also a roughness tester; however, the reporting (in microns roughness) is a function of the cube root of the measured air flow. In the last few decades, the zeitgeist has been to accurately name the test methods in accordance with the function and not to continue using the manufacturer’s earlier assigned name, if it was not technically correct.

Roughness Testers: Bendtsen, Parker Print Surf & Sheffield

Smoothness Tester: Bekk


Future posts will include information on the relationship between paper roughness (smoothness) and the following items:
  • Papermaking Process
  • Printing processes
  • Formation
  • Parker Print Surf Test
  • Sheffield Test
  • Applications

Wednesday, October 9, 2013

Video: Calibrating Your Color Touch 2


We have been working on some new videos to add to our Technidyne YouTube Channel.  One of the latest videos is the calibration of the Color Touch 2 which can be seen HERE.

We are posting product videos, calibration videos and maintenance videos. 

If you have ideas of other videos that would be helpful to you, please let me know by sending me an email at toddp@technidyne.com.

Monday, October 7, 2013

Softness Data: What Does it Mean?

The output of the Emtec TSA goes far beyond just giving a single softness number with excellent correlation to hand feel panel tests. It provides all the data needed to explain the softness number so a determination can be made as to why one product is softer than another.  The feeling of softness one gets from a sample is a combination of three main parameters: softness, structure and stiffness.  Here is an explanation of some of the outputs generated by the TSA:

TS7 - Softness Parameter
The TS7 softness peak is the frequency peak that occurs around 6.5 kHz on the noise spectrum graph.  This peak represents the pure softness and is influenced by the fiber furnish, the degree of refining, the chemicals and other factors concerning the real softness of the sample.  Generally, softer samples produce a lower TS7 peak.

TS750 - Structure Parameter
The TS750 structure peak is the peak at a frequency that falls around 200 - 1,000 Hz. However, this frequency is not fixed like the TS7; it can vary in this range.  This peak represents the structure of the sample which includes such things as creping and embossing.  Generally, samples with lower structure strength will produce a lower TS750 peak.  The creping and embossing process is done to realize a specific structure as it relates to hand feel.  Creping and embossing will tend to make this peak higher.

D (mm/N) - Stiffness Parameter
This is the deformation of the sample under a defined load and refers to its stiffness.


HF - Hand Feel
This HF number is the calculated figure which corresponds and correlates with the Hand Panel Test.  The higher this number is the softer the test sample is and the better it is with respect to hand feel.  Hand Feel is when someone touches the sample by hand and ranks it.  This is a combination of the other parameters described above: TS7, TS750 and D.