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Tuesday, April 29, 2014

TAPPI PaperCon 2014 (April 29)

We are unveiling a new branch in the Color Touch family,

Color Touch 45.

The evolution of the Brightimeter S-4M and Micro S-5, the Color Touch 45 has TAPPI T452, directional geometry (45° illumination/0° viewing), full spectrophotometer, D65 high UV Level, C moderate UV Level, and much more. 

Come see us this week at booth 512, TAPPI PaperCon '14, Nashville, TN.

Monday, April 28, 2014

TAPPI PaperCon 2014 (April 28)

We are unveiling the next generation of the Color Touch family,

Color Touch X.

Extended wavelength capabilities, automatic calibration, swing-in standard, touch screen operation, and much more. 

Come see us this week at booth 512, TAPPI PaperCon '14, Nashville, TN.

Wednesday, April 23, 2014

What's New at Technidyne?

Next week TAPPI PaperCon '14 is being held in Nashville, TN April 27-30, 2014.  Booth 512 will have a variety of products from Technidyne and it's partners such as Emtec, Techpap and Tapio.

Technidyne will be introducing a variety of new products and services. 

  • The next generation of Color Touch will be on display.
  • A new website catering to the needs of our international customers.
  • Updates to many traditional products will be discussed.
  • Input from customers on user interface and TAPPI Brightness, Color, Whiteness and Fluorescence will be solicited.

There is a lot of research and development going on here at Technidyne. We have at least 4 new products that will be released in 2014. We are putting some new technology in existing products, adding a new look to familiar tests and introducing new, advanced technology for our customers around the world. We will also have an announcement in the next few weeks that will expand our presence on the internet.

The best way to find out about these things is to follow this blog, see updates on our websiteTechnidyne on Facebook and see us at trade shows around the world.  Some of the other upcoming trade shows are:
Please check out our ever-changing Technidyne Website.

Monday, April 21, 2014

Smoothness Question

Recently, a customer asked the question: If the smoothness test result is a high number like 80, does it mean that the paperboard is more open or closed?

The first thing to determine is what measurement scale the number "80" is referenced.  There is a big difference in the meaning of the test value if you are measuring surface properties or air permeance. At least the reported test value of "80", can be used to open this discussion.

Bendtsen Roughness Tester Measuring Head
There have been changes in the titles of some of the test methods that measure this property; i.e., "roughness" or "smoothness".  When an instrument reports an increasing test value as the surface gets rougher, it is designated to be a "roughness tester".  Examples of this would be the Sheffield method and the Bendtsen method.  When these "roughness" instruments are connected to a measuring head that uses a gravity deadweight to load a polished circular measuring land against the paper surface, with the bottom of the paper supported by a flat glass backing, the test values increase as the surface is rougher.

When these same Sheffield and Bendtsen instruments are connected to measuring heads with rubber rings, which clamp the paper and define a test area, the instruments measure air permeance (the reciprocal of air resistance), Since your question made a reference to the paperboard as being "open or closed", I mention the air permeance topic because papermakers commonly reference the terms "open or closed" to the relationship of airflow that can pass through the paperboard.  A closed sheet allows less airflow to pass through than an open sheet, under the prescribed test parameters.

Since you are testing paperboard, another topic that frequently arises is the influence of highly porous paper on the surface air-leak test measurements. If the test value of "80" is either a Sheffield or Bendtsen surface roughness test value, perhaps you are testing a coated board, or a calendared board grade. In order to get a surface test value as low as 80 on a paperboard grade, most likely there is not a significant amount of air flow through the sheet, as compared to many of the rougher linerboard packaging grades.

Bekk Smoothness Tester Measuring Head
To finish the discussion, there is an air-leak smoothness tester, the Bekk tester, which gives an increasing test value as the surface gets smoother.  In this test, the reported test value is the time it takes to "leak air into the system" to reduce vacuum intensity, and the leak occurs between the paper surface and a polished flat glass plate.  Rough paper, which leaks air at a faster rate, takes less time to break the vacuum than a smooth paper surface. This same instrument is sometimes fitted with rubber rings to measure air resistance.

In addition to letting us know just what instrument and technique the "80" value comes from, it would be interesting to know the end use of your product.  The surface properties, and air permeance properties are measured for different reasons.

Thursday, April 17, 2014

ISO Technical Committee 6 (TC6) - Pulp, paper and board: Meeting April 7-11

The ISO Technical Committee (TC) 6 for Paper, board and pulps met April 7-11 in Delft, The Netherlands.  NEN the standardizing organization for The Netherlands was the host.  Some of the Working Groups (WG) that participated included:
WG 3 - Optical Properties
WG 4 - Chemical Properties
WG 10 - Automated Testing
WG 12 - Accelerated Aging
WG 25 - Surface Roughness
WG 26 - Microbiological
WG 27 - Tissue Test Methods
WG 37 - Air Permeance
WG 39 - Printability Testing
WG 41 - Contact Angle
WG 42 - Internal Bond Strength

and AHG1 (Ad-hoc Group) - Nanocellulose

Technidyne has participated in ISO, TAPPI PAPTAC, and many other technical committees for 40 years. If you have questions, always feel free to use us as your technical resource.

Monday, April 14, 2014

Why Measure Roll Hardness?

By taking hardness readings across the roll, uneven, too soft or too hard winding can be detected and the roll can be rejected. This minimizes the risk of complications e.g. during the printing process on paper.

There are several reasons why a ROLL PRODUCER may want to test the roll structure of shipping rolls (or jumbo reels):

  • To determine the cause of specific roll defects such as crepe wrinkles or corrugations
  • As an aid to establishing the winding criteria of a newly installed winder or major rebuild of a winder or reel
  • As a quality control tool to check rolls before they are shipped to an end user

A CONVERTER may want to check shipping rolls received from a roll producer:

  • To determine how specific roll irregularities effect the efficiency of their machine
  • To supply creditable data to enable the roll producer to understand and resolve his concerns.

Rolls that are wound too soft typically may go out of round during transport and storage. If this happens it causes irregularities while unwinding and the only way to compensate for the effects is to slow down the speed of the unwinding machine leading to a loss in production. Rolls that are wound too tightly can lead for example, to bursts within the roll, corrugations on the surface as the web is stretched too tightly, etc.

These variations are very difficult to detect without the aid of a hardness tester, and if they go undetected, serious problems can result. Above all, “it is typically the variation in hardness across a given roll that relates most directly to such converting issues with soft edges being perhaps the biggest contributor.” (TAPPI T 834 om-12 "Determination of containerboard roll hardness")

There are several roll hardness testers available to the Paper Industry. The Tapio RQP uses technology developed specifically for the Paper Industry.  It has the most current technology, user interface and fine resolution.  This device can determine the hardness of large rolls of paper, film and foil. It provides fast, accurate, non-destructive hardness profiles of rolls to assure smooth and efficient printing. As stated above, rolls that are too hard, or too soft, rolls that are unevenly wound, or rolls with different moisture contents can cause difficulties during the printing process.

Wednesday, April 9, 2014

Visit in Germany

I spent some time with our partners at Emtec Electronic GmbH in Leipzig, Germany on April 6 & 7, 2014. Technidyne is the sales and service partner for Emtec in the United States and Canada.  Likewise, Emtec sells and services Technidyne equipment in Germany, Austria, Switzerland and the Benelux countries.

We discussed the success of the Tissue Softness Analyzer (TSA) worldwide and the new products coming to the market soon: Ash Content Analyzer (ACA) and Fiber Potential Online (FPO)

We also discussed many of the new products coming to the market from Technidyne, including the FPAutoSpeck for stickies measurement and significant updates to many other instruments.

You can see both of our products at upcoming exhibitions:
Asian Paper, Bangkok, Thailand - April 2014
PaperCon, Nashville, TN, USA - April 27-30, 2014
Zellcheming, Frankfurt, Germany - June 24-26, 2014

Sunday, April 6, 2014

Practical Aspects of Color Matching: Color Measurement Systems

There is no "perfect" system for measuring and quantifying color, however, there are some very good ones.  A combination of a color management system and visual assessment is recommended to best match color samples.  The Technidyne Seminar Manual provides a good introduction to the different color measurement systems.

Spectral curves present the most complete method for comparing samples. The spectral curve is really the 'fingerprint' of the color under a given lighting condition. However, for many people, it is confusing to understand and control.
These spectral curves help illustrate differences between virgin and recycled newsprint.

The magnitude and direction of color differences between a sample and a standard can be easily determined and understood with a color measurement system.

L,a,b and L*a*b* 
These systems are widely used and understood in the Paper Industry.  These systems are good for pinpointing where a sample resides in color space in relationship to a standard; in a sense, a road map for getting closer to the standard (or target).  The delta values for L,a,b and L*a*b* help clearly identify the color difference areas. This allows the user to determine what controls to use to get a better match.

The CIE L*C*h system is an adaptation of the L*a*b* color space. L* represents lightness, C* is chroma, and h is hue (angle).  An extensive system for color matching has been developed using this system which provides excellent pass/fail tolerances that match with visual assessments very well.  This is called the CMC Color Difference Formula (see related blog). Using the CMC Formula the user selects a Commercial Factor that determines how far a sample can stray from the standard in color space and still be acceptable.  In the long term, this is an excellent system, but it would require extensive training of mill personnel.

If you want help determining the best color system for your situation or if you want training on how to use a color system, feel free to contact me.

Friday, April 4, 2014

ISO Optical Properties Authorized Lab (OPAL) Meeting - April 3 & 4

OPAL Attendees (L-R): Front - Li Yang (Innventia), Jon Saatvedt (Technidyne); Back - Lyne Cormier (TC6 Chair/FPInnovations), Joanne Zwinkles (Chair WG3), Sylvie Moreau-Tabiche (CTP), and Todd Popson (Technidyne)

The ISO OPAL (Optical Properties Authorized Laboratory) group met in Delft, Netherlands April 3 & 4, 2014 at NEN (Netherlands Standardization Institute).  This group is comprised of organizations which have been approved via ISO 4094 to provide optical calibration standards for ISO Standard 2469 conforming instruments.  The group meets in person at least every 18 months to review data and comparisons among each other. Also, procedures, issues and techniques are discussed with the group.  The Chairperson of ISO TC 6 (Technical Committee on paper, pulp and paperboard) WG3 (Working Group on optical properties) leads the discussion.  The group does share readings, data and concerns on an ongoing basis as well.  Current members include:

  * Technidyne Corporation (USA)

  * FPInnovations (Canada)
  * Innventia (Sweden)
  * Labtium (Finland)
  * CTP (France)

This coming week the full WG3 will meet to discuss existing and future work items at NEN.

Thursday, April 3, 2014

Technidyne at PaperCon

TAPPI PaperCon '14 is being held in Nashville, TN April 27-30, 2014.  Booth 512 will have a variety of products from Technidyne and it's partners such as Emtec, Techpap and Tapio.

Technidyne will be introducing a variety of new products and services. More on this as we approach the conference!