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Editorial: Innovative oxygen delignification: Conversations with the TAPPI Journal 2012 Best Research Paper Award-winning authors, TAPPI JOURNAL June 2013
Editorial: Innovative oxygen delignification: Conversations with the TAPPI Journal 2012 Best Research Paper Award-winning authors, TAPPI JOURNAL June 2013
Journal articles
Innovations in forming earn brian attwood TAPPI's 2000 Gunnar Nicholson Gold Medal, TAPPI JOURNAL, February 2000, Vol. 83(2)
Innovations in forming earn brian attwood TAPPI's 2000 Gunnar Nicholson Gold Medal, TAPPI JOURNAL, February 2000, Vol. 83(2)
Journal articles
Green bay packaging's continuing journey of excellence - rebuild of pm 2, TAPPI JOURNAL, February 2000, Vol. 83(2)
Green bay packaging's continuing journey of excellence - rebuild of pm 2, TAPPI JOURNAL, February 2000, Vol. 83(2)
Journal articles
Choosing the right refiner plate bolts: a practical guide, TAPPI JOURNAL, February 2000, Vol. 83(2)
Choosing the right refiner plate bolts: a practical guide, TAPPI JOURNAL, February 2000, Vol. 83(2)
Journal articles
Predicting the press dewatering of heavyweight grades, TAPPI JOURNAL, February 2000, Vol. 83(2)
Predicting the press dewatering of heavyweight grades, TAPPI JOURNAL, February 2000, Vol. 83(2)
Journal articles
Tissue roll handling with an agvs, TAPPI JOURNAL, February 2000, Vol. 83(2)
Tissue roll handling with an agvs, TAPPI JOURNAL, February 2000, Vol. 83(2)
Journal articles
Good gravy, davy, TAPPI JOURNAL, February 2000, Vol. 83(2)
Good gravy, davy, TAPPI JOURNAL, February 2000, Vol. 83(2)
Journal articles
Magazine articles
Numerical investigation of the effect of ultrasound on paper drying, TAPPI Journal March 2022
ABSTRACT: The paper drying process is very energy inefficient. More than two-thirds of the total energy used in a paper machine is for drying paper. Novel drying technologies, such as ultrasound (US) drying, can be assessed numerically for developing next-generation drying technologies for the paper industry. This work numerically illustrates the impact on drying process energy efficiency of US transducers installed on a two-tiered dryer section of a paper machine. Piezoelectric transducers generate ultrasound waves, and liquid water mist can be ejected from the porous media. The drying rate of handsheet paper in the presence of direct-contact US is measured experimentally, and the resultant correlation is included in the theoretical model. The drying section of a paper machine is simulated by a theoretical drying model. In the model, three scenarios are considered. In the first scenario, the US modules are positioned in the dryer pockets, while in the second scenario, they are placed upstream of the drying section right after the press section. The third case is the combination of the first and second scenarios. The average moisture content and temperature during drying, enhancement of total mass flux leaving the paper by the US mechanism, total energy consumption, and thermal effect of heated US transducers are analyzed for all cases. Results show that the application of the US can decrease the total number of dryer drums for drying paper. This numerical study is based on the US correlation obtained with the US transducer direct-contact with the paper sample. Thus, future work should include US correlation based on a non-contact US transducer.
Journal articles
Magazine articles
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.