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Smart vs. Big Data Analysis: How could you get more out of less in board strength modelling?, Smart vs. Big Data Analysis: How could you get more out of less in board strength modelling?Smart vs. Big Data Analysis: How could you get more out of less in bo

Smart vs. Big Data Analysis: How could you get more out of less in board strength modelling?, Smart vs. Big Data Analysis: How could you get more out of less in board strength modelling?Smart vs. Big Data Analysis: How could you get more out of less in board strength modelling?, 19PaperCon

Use of enzymes for reduction in refining energy - laboratory

ABSTRACT: We performed laboratory and process-scale studies with mixtures of cellulase and hemicellulase enzymes for reducing the refining/beating energy requirement of different types of pulp. Those included hardwood kraft pulp, long fiber fraction of bamboo pulp, old corrugated containers (OCC), and mixed pulp containing new double-lined kraft cuttings (NDLKC) and long fiber fraction of bamboo pulp. In the laboratory, the refining energies were reduced by 18%-45% for different pulps with these enzymes. The strength properties of pulps were not affected by enzyme treatment. In the process-scale trials, use of one of the enzyme products in the production of high strength extensible sack kraft paper (ESKP) reduced the required refining energy by 25 kWh/metric ton of pulp. It also yielded savIngs in steam consumption per ton of paper of about 20% from various sections of the machine operation. The mill was able to bypass one double disc refiner (DDR) when the furnish was changed to 60%unbleached bamboo kraft pulp (long fraction) and 40% NDLKC for producing normal ESKP. This reduced the energy requirement by about 54 kWh/metric ton of pulp, with an 8% savings in steam consumption per ton of paper. The mill was able to produce high strength paper having high porosity without sacrificing other strength properties. Trials with the same enzyme in a mill producing mainly coated white paper showed a reduction in refining energy of about 70 kWh/metric ton of softwood pulp and 30 kWh/metric ton of hardwood pulp. Steam consumption on the paper machine was reduced by approximately 0.5 ton steam/metric ton of paper. By using enzymes, the mill eliminated a refining bottleneck in its softwood line and increased production by 12%. The strength properties of the pulps were not affected. In a mill producing heavy base papers, enzyme use enabled the mill to bypass one 180 kW triple disc refiner (TDR). Pulp strength and other properties were within the specified limits and comparable to those of the control. All these mills have started using enzyme on regular basis.

Innovative Paper-Based Functional Materials Driving the Sustainable Growth of the Eco-Friendly Paper Industry

Student Membership

Student Membership Student Membership TAPPI Student Membership provides access to the people, resources, and information needed to get the most from your college experience and launch a successful

New Handbook Assists Paper Mills to Achieve Efficient Operation through Utilization of Process Chemicals

Process Chemicals for Papermaking Now Available From TAPPI Press

Master Papermaking Additives to Gain Competitive Advantage and Better Meet Customers’ Needs

Make Paper Products Stand Out: Strategic Use of Wet End Chemical Additives Now Available From TAPPI Press

Corrosion Monitoring and Root Cause Identification in High Solids Concentrators

Black liquor high solids (about 80%) concentrators have often been found to suffer from aggressive corrosion. In particular, the first and second effect bodies are susceptible to corrosion attacks resulting in tube leaks and wall thinning, which limit the availability and lifetime of evaporator lines. Corrosion dynamics and construction materials have been studied extensively within the pulp and paper industry to understand the corrosion process. However, it has been challenging to identify root causes for corrosion, which has limited proactive measures to minimize corrosion damage. Corrosion of the first phase concentrator was studied by defining the potential regions for passive area, stress corrosion cracking, pitting corrosion, and general corrosion. This was achieved by using a technique called polarization scan that reveals ranges for the passive area in which the equipment is naturally protected against corrosion. The open circuit potential, also known as corrosion potential, and linear polarization resistance of the metal were monitored online, which allowed for definition of corrosion risks for stainless steel 304L and duplex stainless steels 2205 and SAF 2906. An online temperature measurement added insight to the analysis. A process diagnostics tool was used to identify root causes of the corrosion attacks. Many of the root causes were related to process conditions triggering corrosion. Once the metal surface was activated, it was difficult to repassivate the metal naturally unless a sufficient potential range was reached.

Information Resource Library

In 1983, James d'A Clark donated his personal library to TAPPI. Combined with the association's existing materials, The James d'A Clark Information Resource Center was established in conjunction with the opening of the new TAPPI Headquarters in Atlanta.

A targeted approach to produce energy-efficient packaging materials from high-yield pulp, TAPPI Journal August 2025

ABSTRACT: Unlike fossil-based plastics, wood-based packaging materials can be produced in an ecofriendly manner using wood chip residuals from sawmills and pulpwood. To produce high-yield pulp like chemithermomechanical pulps (CTMPs) for paperboard and liquid packaging, it is crucial to reduce the electric energy consumption during fiber separation. The ultimate objective is to revolutionize paperboard production by achieving a middle-layer CTMP process that consumes less than 200 kilowatt-hours per metric ton (kWh/t), significantly improving from the current 500•600 kWh/t energy demand. Optimizing the CTMP impregnation process of sodium sulfite (Na2SO3) in wood chips is crucial for achieving uniform softening, ideally at the fiber level. The properties of the fibers are significantly affected by the content of lignin sulfonates within the walls of the fiber and the middle lamellae. In this study, we employed in-house developed X-ray fluorescence (XRF) techniques, validated by beamline measurements, to map the distribution of sulfonated lignin within fibers. It also seemed possible to enhance the surface area of lignin-rich pulp fibers while losing minimal bulk by refining them with well-optimized low consistency (LC) refining. We aimed to achieve a highly efficient separation of coniferous wood fibers by co-optimizing the sulfonation and the temperature in the preheater and chip refiner. Additionally, we explored how lignin’s softening behavior and potential crosslinking influence subsequent unit operations, including pressing, peroxide bleaching, and drying, following the defibration process. In defibration during chip refining, the maximum softening of wood fibers is preferred to maximize fiber preservation and minimize energy consumption. However, optimizing the stiffness of finished pulp fibers is preferable to reduce bulk loss during paperboard production. It can strive to optimize processes to develop stronger, lighter, and more sustainable composite packaging materials. Reducing environmental impact and electric energy can help create a more sustainable future.