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Effects of different ammonium lignosulfonate contents on the crystallization, rheological behaviors, and thermal and mechanical properties of ethylene propylene diene monomer/polypropylene/ammonium lignosulfonate composites, TAPPI Journal January 2020

ABSTRACT: Thermoplastic elastomer (TPE), made from ethylene propylene diene monomer (EPDM) and polypropylene (PP) based on reactive blending, has an excellent processing performance and characteristics and a wide range of applications. However, there are currently no reports in the literature regarding the usage of TPE in making composite boards. In this paper, EPDM, PP, and ammonium lignosulfonate (AL) were used as the raw materials, polyethylene wax was used as the plasticizer, and a dicumyl peroxide vulcanization system with dynamic vulcanization was used to make a new kind of composite material. This research studied the influences of the AL contents on the crystallization behaviors, rheological properties, thermal properties, and mechanical properties of the composites. The results showed that the AL content had a noticeable impact on the performance of the composite board. Accordingly, this kind of composite material can be used as an elastomer material for the core layer of laminated flooring.

Journal articles
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Open Access
Root cause analysis of cationic polymer additive efficiency decline in virgin and recycle containerboard mills, TAPPI Journal January 2020

ABSTRACT: It is well known that retention, drainage and strength polymers struggle to perform (if at all) in virgin containerboard mills. In-depth studies have been undertaken in this area for more than seven years, investigating the issue from all directions. A key finding of this work is that soluble lignin is detrimental to chemical efficiency. A strong correlation exists between decreased chemical efficiency and high soluble lignin. Both recycled systems and virgin systems have been studied, and this correlation holds true regardless of furnish. The primary area of concern is virgin container-board, because these mills tend to have the highest lignin levels. Some highly closed recycled mills can also build elevated lignin levels that can negatively affect chemical efficiency.

Journal articles
Magazine articles
Over the Wire, Paper360º March/April 2020

Over the Wire, Paper360º March/April 2020

Journal articles
Magazine articles
The European Industry: Plenty of Challenges and Opportunities, Paper360º March/April 2020

The European Industry: Plenty of Challenges and Opportunities, Paper360º March/April 2020

Journal articles
Magazine articles
Paptic: Paper Products to Help Save the World, Paper360º March/April 2020

Paptic: Paper Products to Help Save the World, Paper360º March/April 2020

Journal articles
Magazine articles
Quick Evaluation of Fillers and Fines in Paper and Board, Paper360º March/April 2020

Quick Evaluation of Fillers and Fines in Paper and Board, Paper360º March/April 2020

Journal articles
Magazine articles
Preventive Maintenance Cards, Anyone?, Paper360º March/April 2020

Preventive Maintenance Cards, Anyone?, Paper360º March/April 2020

Journal articles
Magazine articles
2020 TAPPI/PIMA Awards:, Paper360º May/June 2020

2020 TAPPI/PIMA Awards:, Paper360º May/June 2020

Journal articles
Magazine articles
Long-Term or Short-Term Results?, Paper360º May/June 2020

Long-Term or Short-Term Results?, Paper360º May/June 2020

Journal articles
Magazine articles
Open Access
Improving paper wet strength via increased lignin content and hot-pressing temperature, TAPPI JOURNAL October 2020

ABSTRACT: It is known that the strength properties of wood-based paper materials can be enhanced via hot-pressing techniques. Today, there is a desire not only for a change from fossil-based packaging materials to new sustainable bio-based materials, but also for more effective and eco-friendly solutions for improving the dry and wet strength of paper and board. Against this background, hot pressing of paper made from high yield pulp (HYP), rich in lignin, becomes highly interesting. This study investigated the influence of pressing temperature and native lignin content on the properties of paper produced by means of hot pressing. Kraft pulps of varied lignin content (kappa numbers: 25, 50, 80) were produced at pilot scale from the same batch by varying the cooking time. We then studied the effect of lignin content by evaluating the physical properties of Rapid Köthen sheets after hot pressing in the temperature range of 20°C•200°C with a constant nip pressure of 7 MPa. The pilot-scale cooked pulps were compared with reference samples of mill-produced northern bleached soft-wood kraft (NBSK) pulp and mill-produced chemithermomechanical pulp (CTMP).Generally, the results demonstrated that lignin content had a significant effect on both dry and wet tensile index. All of the pilot cooked pulps with increased lignin content had a higher tensile index than the reference NBSK pulp. To obtain high tensile index, both dry and wet, the pressing temperature should be set high, preferably at least 200°C; that is, well above the glass transition temperature (Tg) for lignin. Moreover, the lignin content should prefera-bly also be high. All kraft pulps investigated in this study showed a linear relationship between wet strength and lignin content.

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