2 edition of effect of wood density on the kraft pulping properties of Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco) found in the catalog.
effect of wood density on the kraft pulping properties of Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco)
Written in English
|Statement||by Montree Promachotikool.|
|The Physical Object|
|Pagination||, 98 leaves, bound :|
|Number of Pages||98|
Allergies/Toxicity: Although severe reactions are quite uncommon, Douglas-Fir has been reported to cause skin irritation, nausea, giddiness, runny nose, along with an increased likelihood of splinters getting infected. See the articles Wood Allergies and Toxicity and Wood Dust Safety for more information. Kraft Pulping and Characterization of Strength Properties of Fungal Treated and Untreated Bamboo Pulps Introduction Kraft pulping is one of the major chemical pulping processes used for production of pulp from complex wood based raw materials (Grace and Malcolm, ; Gullichsen and Fogetholm, ).
Pulp Kappa No. Volume (ml) of N potassium permanganate consumed by 1 od g pulp. Estimate of lignin content. Kappa no. x ≅% lignin SW Linerboard pulp = kappa SW Sack kraft pulp = kappa SW Bleachable grade pulp = kappa HW Linerboard grade = kappa HW Bleachable grade = kappa. wood material made from Douglas fir and epoxy. Results of tests conducted by several organizations are correlated to provide insight into the effects of variables such as moisture, size, lamina-to-lamina joint design, wood veneer grade, and the ratio of cyclic stress to steady stress during fatigue testing.
The white wood and thin cell walls of spruce give the strongest and brightest mechanical pulp of the four, making it the preferred genus for high-yield pulping. Douglas-fir, giving low strength and low brightness, is rarely used in mechanical pulping. Table 2. Typical pulp properties and energy consumptions of different species compared with spruce. Wood properties determine the usability of wood as end products. Wood density is a commonly used indicator of wood quality, which is related to other wood properties, such as timber strength and shrinkage, as well as pulp yield and properties (e.g. Panshin and de Zeeuw, ; Harris, ; Saranpää, ).
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THE EFFECT OF WOOD DENSITY ON THE KRAFT PULPING PROPERTIES OF DOUGLAS-FIR (PSEUDOTSUGA MENZIESII (MIRB.) FRANCO) INTRODUCTION Although many studies of the mechanism of pulping processes have been performed in the past, these mechanisms are not completely understood today.
Part of our lack of understanding is due to inadequacy of the. Wood properties did not show significant\ud effects on the pulping reactions compared to the effects\ud of time and temperature. However, their influences on\ud delignification was greater than on pulping reactions.\ud The intermediate density wood sample which had the\ud lowest amount of lignin and the highest amount of sapwood\ud underwent.
Title: The Effect of Forest Stand Thinning on Selected Strength and Pulping Properties of Douglas-fir Abstract approved: Dr. McKimmy The purpose of this study was to determine if amount and kind of thinning had an effect on wood specific gravity, modulus of rupture, modulus of elasticity, growth rate, or pulp yield and kappa number.
sheets from unbeaten and beaten kraft pulp fiber ( ml CSF). (M ) To assess the potential of the L/T ratio, it is necessary to remove the overrid ing effect that wood density may sometimes contribute to pulp sheet properties.
It is apparent from this study and other studies (10,23,24) that wood density is a factor in the. Graduation date: A study has been made of the kraft pulping properties of young Douglas-fir trees which were thinned from an experimental plantation.
The purpose of the plantation study is to determine, whether two year old seedlings can be selected on the criteria of height and branch count for future desirable tree and utilization.
However, the kraft pulping process shows some disadvantages, among which include low yield (wood conversion into pulp), high investment for the implementation of pulp production mills, high production cost, and the generation of odorific gases (Gomide et al.
; Silva Jr. ; Almeida ). The fibre, kraft pulping, and physical and optical pulp properties of year old western hemlock obtained from two sites located near Port Hardy.
Refining (i.e., mechanical beating of pulp) is a common procedure that is used in paper-making to improve the mechanical properties of the final product. The improvements caused by refining are mainly attributed to increased density and to a better bonding between fibers.
In this work, we study how various mechanisms that can be triggered by refining affect. Wood density is a complex physical property related to both the anatomical structure and the chemical composition of wood, and responding to genetic, environmental and physiological influences [1, 2].On the other hand, density is related to most of the resistance properties of timber as well as many aspects of wood processing (chipping, transport, pulping.
Kraft Black Liquor Production ~ lb of black liquor solids per ton of air-dried unbleached pulp Slide 4 Evaporation Required to Burn Liquor • Weak BL from washers – % solids – % water • BL to recovery boiler – % solids – % water.
The effects of initial tree spacing on the fibre properties of plantation-grown coastal western hemlock An evaluation of the wood density and fibre properties of year-old coastal western This implies that wood chips prepared from a range of small-diameter thinnings material will not adversely affect kraft pulp fibre properties.
Cited by. During kraft pulping, roughly half of the initial feedstock material is dissolved in black liquor. The organic matter in wood-based black liquor (Table 3A.3), after the separation of most of the nonvolatile extractives (i.e., as the tall oil soap) in multiple-effect evaporators prior to the liquor combustion in the recovery furnace, consists typically of degraded lignin and polysaccharide.
This Douglas-fir wood disk pro vides the opportunity to study the effect of within-tree variable growth rate on wood anatomical properties. The two disks of lodgepole pine trees (Fig. 3) were also supplied by Ponderay Valley Fibers. These two disks are used to verify the observed relations between growth rate and wood and tracheid properties from.
uniformity of wood density and tracheid anatomy, beneficial to thermomechnical pulping (Rudie et al ). In the present study, the Ring-Profiler technique developed in our previ-ous study (Vahey et al ) was employed to measure wood density and anatomical properties of a Douglas-fir wood core sample.
The objec. The kraft process, which uses sodium hydroxide (NaOH) and sodium sulphide (Na2S) to pulp wood, is the dominant pulping process in the pulp and paper industry.
About million tons/year of kraft pulp are produced globally, accounting for two-thirds of the world’s virgin pulp production and for over 90% of chemical pulp. The high. The kraft process alone accounts for over 80 percent of the chemical pulp produced in the United States.
The choice of pulping process is determined by the desired product, by the wood species available, and by economic considerations. Kraft Pulping Process Description1-The kraft pulping process (see Figure ) involves the.
Printed in Great Britain /97 $ EFFECTS OF A FUNGAL TREATMENT ON THE BRIGHTNESS AND STRENGTH PROPERTIES OF A MECHANICAL PULP FROM DOUGLAS-FIR Ed de Jong,* Richard P. Chandra & John N. Saddler Forest Products Biotechnolog Department of Wood Science, The University of British Columbia.
“Mixed chip pulping,” BioResources 5(4), PRESENCE OF HARDWOOD CHIPS AND ITS IMPACT ON PULP STRENGTH PROPERTIES IN THE PRODUCTION OF BLEACHED SOFTWOOD KRAFT PULP Zhibin He,a Yonghao Ni,a* and Yajun Zhou b The effect of hardwood admixture (% birch or aspen) in kraft cooking on the strength properties of.
Wood density is a quality trait that is easily measured and relevant to many product performances (e.g., timber stiffness, pulp, paper productivity - Wimmer et al.
The appearance of wood is determined by its shade, shine, grain, lustre and structure. Chemical properties refer to the flammability of wood when dry.
The chemical composition impacts the characteristics of wood fibre, eventually impacting appropriateness for use. Density of Wood. Density refers to the amount of wood in a unit, per volume of wood. History • Soda pulping process patented, • Soda recovery via incineration patented, • First successful soda mill, • Kraft pulping process patented by Dahl, • First commercially viable kraft mill, Sweden, • Kraft recovery furnace, ’s.kraft pulp?
Example 1 found that cubic feet of solid green wood are needed per ton of bleached Douglas-fir kraft pulp. Assuming a cord contains 80 cubic feet of solid wood (Chapter 3), this is equivalent to cords/ton. Example 4 How many cubic feet of gravity-packed western hemlock chips are needed to produce one short ton.
The effect of wood kraft pulp (KP) feed on dietary digestibility, ruminal fluid pH, rumen fermentation characteristics, and milk production performance in lactating dairy cows was examined. Four lactating dairy cows were used for the feeding experiment by the cross‐over design.
The control group and KP group were set up as treatments.