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Thursday, January 30, 2014

Photo/Video Studio

We are doing some remodeling here at Technidyne. One of our first projects is completed. We created a photo/video studio. This studio will be used to photograph products and create videos for our Technidyne Website, Blog Posts and our Technidyne YouTube Channel.


You will see the updates continuing to come in the following months and years. It's a great addition to our facility in New Albany, Indiana, USA.

If you have other ideas for additions to our website, blogs or YouTube channel, just contact me, toddp@technidyne.com.

Monday, January 27, 2014

How to Increase the Dry-Strength Properties of Paper - Part 1


The primary tools by which papermakers can increase the dry-strength properties of paper are selection or purchase of a suitable quality and type of fibers, increased refining, the use of dry-strength additives, and changing the conditions of wet-pressing (if possible, given the equipment).

The proportion of softwood kraft fibers can be increased if one wants to improve dry-strength in general, and tear strength and folding endurance in particular. Virgin kraft pulps generally have a moderate strength advantage over recycled kraft pulps of the same type, especially if freeness is held constant when making the comparison. The difference has been attributed to closing up of pores in the cell walls of the recycled kraft fibers, making them stiffer and less capable of developing bonded area. Thermomechanical pulps (TMP), especially chemithermomechanical pulps (CTMP), are noted for higher tensile strength compared to stone groundwood, since the pulping process is somewhat less destructive of fiber length. An instrument like the Techpap MorFi (online or lab) can be used to determine the fiber mix.

Conditions needed to maximize tensile strength of paper will not necessarily maximize either the compression strength or stiffness. Such differences can be expected, due to the fact that the latter properties demand less flexibility of the overall product. By contrast, tensile strength can benefit from some ability of the paper to stretch and deform so that the load can be borne more evenly among fibers in the paper.

This information comes from NC State University with the following disclaimer.

PLEASE NOTE: The information in this Guide is provided as a public service by Dr. Martin A. Hubbe of the Department of Wood and Paper Science at North Carolina State University (m_hubbe@ncsu.edu). Users of the information contained on these pages assume complete responsibility to make sure that their practices are safe and do not infringe upon an existing patent. There has been no attempt here to give full safety instructions or to make note of all relevant patents governing the use of additives.

Sunday, January 19, 2014

ISO Paper Calibration Hierarchy

Calibration is extremely important to certify your results, validate production, guarantee customer requirement and compare from one site to another. Calibration for optical properties in the Paper Industry includes calibration of spectral reflectance (minimally 400-700 nm), fluorescent (UV Level D65 & C) and non-fluorescent levels.  ISO employs a three level system of distribution of calibration standards as described in ISO 2469.  The three levels are:

IR1: The perfect reflecting diffuse (absolute reflectance)

IR2: Standardizing laboratories; National Research Council of Canada (NRC), NIST (USA) and PTB (Germany)

IR3: Authorized laboratories:

         USA        Technidyne Laboratory Services

         Canada    FPInnovations
         Finland    Labtium
         France     Centre Technique due Papier
         Sweden   Innventia



ISO STANDARDS HIERARCHY
Laboratory
Activity
Standard Issue

ISO Standardizing

Establishes IR1 (perfect reflecting diffuse)
Evaluates IR2 against IR1


IR2 (level 2 standard)
ISO Authorized
Evaluates IR3 against IR2

IR3 (level 3 standard)
Testing
Calibrates test instrumentation with IR3




All of the ISO Authorized Laboratories exchange IR3's on a monthly basis to see how they agree and as a diagnostic tool to detect errors.  The labs also meet at least every 18 months to discuss procedures, discrepancies, concerns and coordinate projects.

To learn more about Technidyne's calibration process and materials, contact Jon Saatvedt and see our website Technidyne Laboratory Services

Technidyne...for good measure. Visit us at www.technidyne.com

Sunday, January 12, 2014

Thickness Measurement for Tissue

Thickness (or caliper) is a very important parameter in tissue production and converting.

One technique that can aid in the process is acquiring a thickness profile.  Getting a thickness profile across the machine enables the operator to pinpoint locations on the tissue machine where thickness varies.  This knowledge helps eliminate downstream issues in converting.



TAPPI Test Method T580, "Thickness (caliper) of towel, tissue, napkin and facial products", has a modified (reduced) lowering speed of the platen and a modified (lower) measuring force to give data that enables better characterization of key features of a tissue, napkin, or towel grade.  Both of these changes prevent the measuring head from 'dropping' on the tissue resulting in inadvertent lower thickness readings.  This method also describes the procedure for measuring bulking thickness and variations in tissue paper and tissue products.

TAPPI T580 uses a relatively low pressure 2 kPa (0.3 psi) because of the collapsible structure of tissue paper. TAPPI T 411 “Thickness (caliper) of paper, paperboard, and combined board” uses a relatively high pressure 50 kPa (7.3 psi).

An essentially identical method is described in ISO 12625-3 “Tissue paper and tissue products -- Part 3: Determination of thickness, bulking thickness and apparent bulk density.” 


The Technidyne PROFILE/Plus Thickness is capable of measuring according to any of these standards. It also provides automatic profiling capability to provide more thorough data providing greater information for converting processes.

Contact Rodger Segelstrom or look at the Technidyne website for more information.

TISSUE BACKGROUND

Tissue paper is produced on a paper machine that has a single large steam heated drying cylinder (yankee dryer) fitted with a hot air hood. The raw material is paper pulp. The yankee cylinder is sprayed with adhesives to make the paper stick. Creping is done by the yankee's doctor blade that is scraping the dry paper off the cylinder surface. The crinkle (crêping) is controlled by the strength of the adhesive, geometry of the doctor blade, speed difference between the yankee and final section of the paper machine and paper pulp characteristics.

The highest water absorbing applications are produced with a through air drying (TAD) process. These papers contain high amounts of NBSK and CTMP. This gives a bulky paper with high wet tensile strength and good water holding capacity. The TAD process uses about twice the energy compared with conventional drying of paper.

The properties are controlled by pulp quality, crêping and additives (both in base paper and as coating). The wet strength is often an important parameter for tissue paper.

Tuesday, January 7, 2014

Dr. Steve Keller in Austria

Miami University's Dr. Steven Keller has been a great friend of Technidyne Corporation for many years.  He is an associate professor of chemical and paper engineering, and was selected as a Fulbright visiting professor to Austria for the U.S. Scholar Program for the 2013-2014 academic year.
Keller, who joined Miami in 2006, will teach two courses at Graz University of Technology; one considering the surface chemistry of the manufacturing processes of paper, tissue and nonwovens, and the second on the subject of paper converting processes. He also will conduct research on the structure of low-density fibrous webs and how the distribution of fibers contributes to the properties of strength, softness and absorptivity.

In addition to his research and teaching, Keller will work to initiate a three-week study abroad

workshop for about 20 engineering students for Miami’s new winter session in January 2014.
 
I have talked to Dr. Keller while on his trip. It has been a great experience for him, and he has made some great connections with researchers and industry leaders throughout Austria.

The Fulbright U.S. Scholar Program sends approximately 800 American scholars and professionals per year to approximately 125 countries, where they lecture and/or conduct research in a wide variety of academic and professional fields. There are typically only about 35 U.S. Scholars in the field of engineering each year.


Original article released by Miami University News