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Predicting strength characteristics of paper in real time using process parameters, TAPPI Journal March 2022
ABSTRACT: Online paper strength testing methods are currently unavailable, and papermakers have to wait for manufacture of a complete reel to assess quality. The current methodology is to test a very small sample of data (less than 0.005%) of the reel to confirm that the paper meets the specifications. This paper attempts to predict paper properties on a running paper machine so that papermakers can see the test values predicted in real time while changing various process parameters. This study was conducted at a recycled containerboard mill in Chicago using the multivariate analysis method. The program provided by Braincube was used to identify all parameters that affect strength characteristics. Nearly 1600 parameters were analyzed using a regression model to identify the major parameters that can help to predict sheet strength characteristics. The coefficients from the regression model were used with real-time data to predict sheet strength characteristics. Comparing the prediction with test results showed good correlation (95% in some cases). The process parameters identified related well to the papermaking process, thereby validating the model. If this method is used, it may be possible to predict various elastic moduli (E11, E12, E22, etc.) in the future as the next step, rather than the traditional single number “strength” tests used in the containerboard industry, such as ring crush test (RCT), corrugating medium test (CMT), and short-span compression strength test.
Journal articles
Magazine articles
The Shendye-Fleming OBA Index for paper and paperboard, TAPPI Journal March 2022
ABSTRACT: We are proposing a new one-dimensional scale to calculate the effects of optical brightening agents (OBA) on the bluish appearance of paper. This index is separate from brightness and whiteness indices.In the paper industry, one-dimensional scales are widely used for determining optical properties of paper and paperboard. Whiteness, tint, brightness, yellowness, and opacity are the most common optical properties of paper and paperboard. Most of the papers have a blue cast generated by addition of OBA or blue dyes. This blue cast is given because of the human perception that bluer is whiter, up to a certain limit. To quantify this effect, it is necessary to determine how much blue cast paper and paperboard have. As the printing industry follows the ISO 3664 Standard for viewing, which has a D50 light source, this also plays a very important role in showing a blue cast. Color perception is based on light source and light reflected from an object. The ultraviolet (UV) component in D50 interacts with OBA to provide a reflection in the blue region of the visible spectrum. Use of a UV blocking filter results in measurements without the effect of emission in the blue region. This difference is used in determining the OBA effect in the visible range of the paper. This equation is known as the Shendye-Fleming OBA Index.
Journal articles
Magazine articles
Considerations in managing wastewater odor at pulp and paper operations, TAPPI Journal March 2022
ABSTRACT: Many pulp and paper mills are, at least periodically, faced with the release of odors that can migrate offsite and be considered a nuisance by nearby residents. At chemical pulp mills, perceptible odors associated with reduced sulfur compounds (RSCs) are common, many of which are highly perceptible owing to their low odor thresholds. As releases of RSCs and other odorous substances from production processes are progressively controlled, the proportional contribution from wastewater treatment systems to areal odors can increase. This review paper summarizes important fundamentals of odor generation, source identification, and control. Common odorous substances are identified, and mechanisms for their generation are summarized. Approaches for measuring odorous substances are detailed to enable more effective management, and various odor control strategies are discussed.
Journal articles
Factors governing print performance in offset printing of matte papers, TAPPI JOURNAL, November 1998, Vol. 81(11)
Factors governing print performance in offset printing of matte papers, TAPPI JOURNAL, November 1998, Vol. 81(11)
Journal articles
Auditing yankee dryer management systems: Theory and practice, TAPPI JOURNAL, November 1998, Vol. 81(11)
Auditing yankee dryer management systems:theory and practice, TAPPI JOURNAL, November 1998, Vol. 81(11)
Journal articles
New technology for papermaking: Commercializing biopulping, TAPPI JOURNAL, November 1998, Vol. 81(11)
New technology for papermaking: commercializing biopulping, TAPPI JOURNAL, November 1998, Vol. 81(11)
Journal articles
Facing the challenge: Mead's Jerry Tatar, TAPPI JOURNAL, November 1998, Vol. 81(11)
Facing the challenge: mead's jerry tatar, TAPPI JOURNAL, November 1998, Vol. 81(11)
Journal articles
Application suggestions for ac drives, TAPPI JOURNAL, November 1998, Vol. 81(11)
Application suggestions for ac drives, TAPPI JOURNAL, November 1998, Vol. 81(11)
Journal articles
Project management issues, TAPPI JOURNAL, November 1998, Vol. 81(11)
Project management issues, TAPPI JOURNAL, November 1998, Vol. 81(11)
Journal articles
Shop talk - handling, circulation, and filtering in metered size press installations, part 1, TAPPI JOURNAL, November 1998, Vol. 81(11)
Shop talk - handling, circulation, and filtering in metered size press installations, part 1, TAPPI JOURNAL, November 1998, Vol. 81(11)