Rejects from sulfite pulp mill that otherwise would be disposed of by incineration were converted to ethanol by a combined physical-biological process that was comprised of physical refining and simultaneous saccharification and fermentation (SSF). The energy efficiency was evaluated with comparison to thermochemically pretreated biomass, such as those pretreated by dilute acid (DA) and sulfite...

Abstract Endoglucanases are increasingly being touted as the ultimate solution for reducing energy consumption during refining process in pulp and paper industry. However, due to high variety of endoglucanases different enzyme formulations, these perform heterogeneously when applied pulps. In this study, effect four on softwood hardwood was studied using confocal laser scanning microscopy (CLSM...

This study was devoted to the development of pulp Luffa Cclindrica and its characterization paper (annual plant fiber of the family Cucurbitaceae). Baking at soda helps to achieve a high level of delignification (Kappa ≤ 10) and high yield (≈ 67%).The beatability stack Valley is comparable to refined wood fibers, the fibers develop a normally time with good hydrophilic pro...

Vessels White oak cell types, fibers, rays, and vessels, were isolated from high-yield chemimechanical, neutral Rays sulphite semichemical (NSSC), and kraft pulps. Milled wood lignins (MWL) from NSSC fiber and ray Fibers cell fractions analyzed by ultraviolet and infrared spectroscopy were found to have similar syringyl/ Cell wall guaiacyl ratios. Methoxyl analyses of MWL’s were also similar an...

In this paper we will focus on three important issues; Process understanding –in relation to control of nonlinear processes; Natural decoupling by using internal state measurement devices – The idea is to use rudimentary controllers with reliable runnability before entering more sophisticated control concepts; Long term follow up procedures of process control investments – An important issue wh...

Extraction of hemicelluloses prior to pulping and conversion of the extracted hemicelluloses to other bioproducts could provide additional revenue to traditional pulp and paper industries. The effect of hemicelluloses pre-extraction with a hydrothermal (HT) process on Pinus radiata chemimechanical pulp (CMP) properties was investigated in this study. The HT extraction resulted in a release of 7...

Fiber trapping in refining has been defined by the fraction f of the bar edges that trap fibers as they cross, and by the number of fibers i trapped under each section of bar. From these parameters, equations were derived to calculate the number of impacts that a fiber undergoes during refining and the maximum force experienced during each impact. Refiner power versus gap was measured for a con...

EXPERIMENTAL A softwood (mainly spruce) bleached kraft pulp (SWBKP), and a hardwood (eucalyptus) bleached kraft pulp (HWBKP) were refined in a PFI mill to 470 and 490 ml CSF freeness, respectively. Three grades of commercial aspen high-yield pulp (325/85, 325/83, 250/80) were obtained from Tembec Inc., without further refining treatment. The properties of the pulp samples are listed in Table I....

Environmental and economic concerns are driving tissue paper manufacturers to improve understanding of the relationships between fibres, networks they form, forming process, final properties. This work investigated how pulp fractionation, refining, or addition microfibrillated cellulose (MFC) affect compromise absorbency strength 33 ± 2 g/m² model papers made bleached eucalyptus kraft pulp. The...