Effect of press closing speed on stress relaxation and set recovery of densified alder wood
Foroogh
Dastoorian
Assistant Prof., Sari agricultural sciences and natural resources university, Department of wood and cellulosic products engineering
author
Reza
Shaabani
B.Sc. student, Sari agricultural sciences and natural resources university, Department of wood and cellulosic products
author
Reza
Ghaffari
B.Sc. student, Sari agricultural sciences and natural resources university, Department of wood and cellulosic products
author
seyed Mohammad Hossein
Yahyaei
B.Sc. student, Sari agricultural sciences and natural resources university, Department of wood and cellulosic products
author
Mostafa
Sam Daliri
M.Sc. student, Sari agricultural sciences and natural resources university, Department of wood and cellulosic products
author
text
article
2020
per
One of methods to overcome the problem of the set recovery in densified wood, is decreasing the press closing speed which leads to stress relaxation during densification. In the present study, the effect of press closing speed (at three levels of 0.2, 0.4 and 0.6 mm/min) at constant compression ratio of 45% was investigated on stress relaxation behavior and set recovery of alder wood. Results showed that with increasing press closing speed, stress created in densified wood was increased and the reason was attributed to the breakage of covalent hydrogen bond and relaxation of stress at lower press speed which led to decreasing of the set recovery. Two stages were observed in stress relaxation curves. At the first stage, the relaxation rate was high, attributed to the slippage of wood molecules and breakage of intermolecular hydrogen bonds. At the second stage, the stress relaxation curve became flat, represented the decrease of the stress relaxation rate. The Results of time-press closing time superposition showed that the master curve was able to predict the stress relaxation behavior to almost 380 hours (380 times of test time). Since a smooth master curve was not achieved by just horizontal shift and a vertical shifting was also required, it can be state that regarding high temperature and moisture content of woods, the material showed a complex thermorheological behavior. With increasing press closing speed from 0.2 to 0.6 mm/min, the set recovery value was increased up to 20%. A linear relation between the residual stress after one hour of stress relaxation and set recovery was found.
Iranian Journal of Wood and Paper Industries
Iranian Scientific Association of Wood and Paper Industries
2008-9066
10
v.
4
no.
2020
469
477
https://www.ijwp.ir/article_36013_a267e4995ac852c42f267b4fe0f1252a.pdf
The product of pulp from hornbeam with alkaline sulfite- AQ process
Ahmadreza
zaheditabarestani
Ph.D., Faculty of wood and paper engineering, Gorgan university of agricultural sciences & natural resources, Gorgan, Iran
author
ahmadreza
saraeyan
Associate Prof., Faculty of wood and paper engineering, Gorgan university of agricultural sciences & natural resources, Gorgan, Iran
author
Hosain
Resalati
Professor, Faculty of wood and paper engineering, Sari university of agricultural sciences & natural resources, Sari, Iran
author
Ali
Ghasemian
Associate Prof., Faculty of wood and paper engineering, Gorgan university of agricultural sciences & natural resources, Gorgan, Iran
author
text
article
2020
per
The objective of this study was to investigate the modification of neutral sulfite semi chemical (NSSC) pulping liquor by applying changes in the percentage of chemicals, increasing alkalinity and changing the pulping duration for the production alkali sulfite (AS). Among the pulps, the best combination was acceptable with respect to the residual alkalinity (pH> 11) and the acceptable kappa number (about 17) and the lowest amounts of so-called undercooked wood (or “rejects”) was selected. Pure AS pulp and also the mixing of different percentages of AS pulp with NSSC pulp were compared. The results showed that the overall strength of the modified pulp compared with the initial NSSC pulp increased. So that the alkali sulfite (AS) and NSSC is about 66.2 and 32.4 N.m/ g, respectively. By adding more amounts of this pulp in furnish, by increasing the required strength of the paper, the consumption of pulp from the imported long fiber could be reduced while maintaining the paper's strength properties.
Iranian Journal of Wood and Paper Industries
Iranian Scientific Association of Wood and Paper Industries
2008-9066
10
v.
4
no.
2020
479
494
https://www.ijwp.ir/article_35278_59f6c774e27227b75edc610a27cf30ca.pdf
Fabrication and properties evaluation of three layered transparent nanocomposite reinforced with cellulose and chitin nanofibers
seddigheh
Izee
Ph.D. student, Department of wood engineering and technology, Gorgan university of agricultural sciences and natural resources, Gorgan, Iran
author
hossein
yousefi
Assoiciate Prof., Department of wood engineering and technology, Gorgan university of agricultural sciences and natural resources, Gorgan, Iran
author
mahdi
mashkour
Assoiciate Prof., Department of wood engineering and technology, Gorgan university of agricultural sciences and natural resources, Gorgan, Iran
author
Davood
Rasouli
Assistant Prof., Department of wood engineering and technology, Gorgan university of agricultural sciences and natural resources, Gorgan, Iran
author
text
article
2020
per
AbstractIn this study, three-layered transparent nanocomposite containing wood cellulose nanofibers (WCNF), bacterial cellulose nanofiber (BCNF) and chitin nanofibers (ChNF) individually as core layer and epoxy as top and bottom layers has been fabricated and characterized. The WCNF, BCNF and ChNF were first converted to nanofilms, followed by solvent exchanging by ethanol and acetone and then immersed into epoxy resin. The impregnated nanofilms with epoxy was cold pressed followed by drying in an oven to get three layered nanocomposites. FE-SEM, transparency and tensile test showed that epoxy could penetrate into the core layer (nanofilms) positively affected the transparency and mechanical properties. The crystallinity index of nanocomposite was lower than that of pure nanofilms. ATR-FTIR confirmed the peaks of nanocomposites were similar to those of epoxy. The mechanical and transparency properties of nanocomposite were higher than those of pure nanofilms. Nanocomposite containing BCNF and ChNF showed highest tensile strength and transparency, respectively.
Iranian Journal of Wood and Paper Industries
Iranian Scientific Association of Wood and Paper Industries
2008-9066
10
v.
4
no.
2020
495
505
https://www.ijwp.ir/article_35467_09470a0db63b542992a2e90c11d33daf.pdf
The effect of dimensional changes of flange and web in I-joist on its bending strength
Morteza
Nazerian
Associate prof., Department of bio-systems, Faculty of new technologies engineering, Shahid Beheshti university, Tehran, Iran
author
Alireza
Rezaian
MS.C., Department of wood and paper science and technology, Faculty of natural resources, University of Zabol, Zabol, Iran
author
Mohammad
Shamsian
Associate prof., Department of wood and paper science and technology, Faculty of natural resources, University of Zabol, Zabol, Iran
author
text
article
2020
per
This study evaluated the effects of flange thickness to depth of web ratio at three levels (1:2, 1.5:3.5 and 2:5) as well as thickness to depth of web ratio at three levels (0.5:2, 0.5:3.5 and 0.5:5) and width of flange at three levels (3, 3.8 and 4.6 cm) as independent variables on some mechanical properties e.g. modulus of rupture (MOR) and modulus of elasticity (MOE) of I-joist manufactured from ash wood (Fraxinus sp.). For this purpose, response surface methodology (RSM) was applied to evaluate the effects of independent variables on MOR and MOE of I-joist based on a three-level, three-variable central composite rotatable design (CCRD). In this survey, bending test was done according to the ASTM D-5055. Mathematical model equations were derived from computer simulation programing to find significant differences and the most effective variables. According to the results, predicted values were found to be in agreement with actual values (R2 values of 0.99 and 0.98 for MOR and MOE, respectively). The study showed that RSM can efficiently be applied in modeling bending properties of I-joist. It was found that all independent variables had direct effect and significant effect on responces; in a way that flange thickness to depth of web ratio, thickness to depth of beam web ratio and width of flange maintained the MOR and MOE at maximum levels up to 2:5, 0.5:5 and 4.6cm, respectively. Simultaneously, some quadratic and interaction terms of variables had significant effects, too. Generally, increment in flange thickness to depth of web ratio, thickness to depth of web ratio and width of flange increased MOR and MOE of I-joist. Besides, flange thickness to depth of web ratio had the strongest effect on bending strength of beams
Iranian Journal of Wood and Paper Industries
Iranian Scientific Association of Wood and Paper Industries
2008-9066
10
v.
4
no.
2020
507
520
https://www.ijwp.ir/article_35714_7d4953f0f4c4d51e369c971b977b0093.pdf
mechanical properties of light weight sandwich panel made of sawdust and waste rubber
mohammad
shamsian
Associate Prof., Department of wood and paper science and technology, University of Zabol, Zabol, Iran
author
afsaneh
shahreki
Ph.D. student of wood composite products, Zabol university, Zabol, Iran
author
toktam
hemati
Ph.D. student of wood composite products, Zabol university, Zabol, Iran
author
babak
nosrati
Associate Prof., Department of wood and paper science and technology, University of Zabol, Zabol, Iran
author
ali
bayatkashkoli
Associate Prof., Department of wood and paper science and technology, University of Zabol, Zabol, Iran
author
text
article
2020
per
In this research, urea melamine formaldehyde resin with the different ratio (90:10, 80”20 and 70:30) of sawdust and rubber waste with the ratio (100:0, 90:10, 80:20) and press temperature (160, 170 and 180 oC) sandwich panels was made. Populous layers with 2 mm thickness also were pressed on the surface of the panels. Flexural strength, modulus of elasticity, internal bonding and compression parallel to the grain tests were used in accordance with the ASTM standard C393, D1037 and C364, respectively. The results of the mechanical tests were analyzed by analysis of variance and averages of groups with Duncan's multiple range test with 95% confidence level. The results showed that the temperature of 170 ° C was the best temperature in terms of mechanical properties of sandwich panels. Addition of 30% melamine formaldehyde resin increased the mechanical properties. Increasing the rubber up to 10% resulted in a maximum increase in compressive strength, flexural strength and internal bonding, and the samples without rubber increased the maximum elasticity modulus.
Iranian Journal of Wood and Paper Industries
Iranian Scientific Association of Wood and Paper Industries
2008-9066
10
v.
4
no.
2020
521
530
https://www.ijwp.ir/article_35736_3018538363430769d0838215cf373eeb.pdf
The effect of kaolinite on the properties of lignocellulose superabsorbent from old corrugated container fiber fines
Vahid
Nejati
MS.C., Wood and paper science and technology department, Natural resources faculty, Tarbiat Modares university, Noor, Mazandaran, Iran
author
amir
Khosravani
Assistant Prof., Wood and paper science and technology department, Natural resources faculty, Tarbiat Modares university, Noor, Mazandaran, Iran
author
Rabi
Behrooz
Associate Prof., Wood and paper science and technology department, Natural resources faculty, Tarbiat Modares university, Noor, Mazandaran, Iran
author
text
article
2020
per
An instance for high added value applications of fines and fiber fractions of old corrugated containers can be production of super-absorbents. As high water gain in super-absorbents leads to a loss of mechanical resistance, and meanwhile addition of chemical cross-linkers increases the costs and environmental problems, therefore, in this research it was tried to improve super-absorbent properties by using mineral additives such as kaolinite. Accordingly, electron microscopy images, X-ray spectra and water absorption tests were studied. The results showed that the natural super-absorbent structure without any other chemical could absorb water more than 30 times as much its own weight. Eventually, it was found that although high amounts of kaolinite decreased the water absorption, but adding appropriate less amount (5%) of kaolinite improved the mechanical properties of the superabsorbent without significant decrease in the water absorption amount.
Iranian Journal of Wood and Paper Industries
Iranian Scientific Association of Wood and Paper Industries
2008-9066
10
v.
4
no.
2020
531
542
https://www.ijwp.ir/article_35838_7fa3f3d48afc3ced55214dc62ee01646.pdf
The effect of residual xylan on cellulose nanofiber production through electrospinning of wheat straw
Seyed Rahman
Djafari Petroudy
Assistant Prof., Biorefinery engineering department, New technologies faculty, Shahid Beheshti university, Zirab science and technology campus, Savadkoh, Mazandaran, Iran
author
Sajjad
Arjmand Kahagh
M.Sc Student , Pulp and paper technology, Biorefinery engineering department, New technologies faculty, Shahid Beheshti university, Zirab science and technology campus, Savadkoh, Mazandaran , Iran
author
Elham
Vatankhah
Assistant Prof., Biosystems engineering department, New technologies faculty, Shahid Beheshti university, Zirab science and technology campus, Savadkoh, Mazandaran, Iran
author
text
article
2020
per
In this research, wheat straw as one of the important and available agricultural residues was used for preparation of cellulose nanofibers through electrospinning process. Wheat straw was pulped and bleached to produce cellulose fibers through soda-AQ and DED bleaching sequences. Trifluoroacetic acid (TFA) and dichloromethane (DCM) were employed to dissolve the cellulose fibers of dissolving pulp (purified with NaOH alkaline extraction) and xylan-rich pulps for preparation of electrospun cellulose nanofibers. SEM images proved that long and homogenous cellulose nanofiber with diameter less than 100 nm can easily be obtained from wheat straw cellulose fibers. Interestingly, average diameter and beaded electrospun nanofibers prepared from xylan-rich cellulose fibers are lower than those lacking xylan. The results of this research corroborated the pivotal role of xylan into the electrospinning process of wheat straw cellulose fibers.
Iranian Journal of Wood and Paper Industries
Iranian Scientific Association of Wood and Paper Industries
2008-9066
10
v.
4
no.
2020
543
558
https://www.ijwp.ir/article_35839_bff0c4ad7e36fd311eb747ff7458e65f.pdf
Chemical treatment of Bagasse by oxalic acid-choline chloride and lactic acid-choline chloride deep eutectic solvents
Jalal
Shakhes
Ph.D. student, Department of wood and paper science and technology, Faculty of natural resources, University of Tehran, Karaj, Iran
author
Yahya
Hamzeh
Professor, Department of wood and paper science and technology, Faculty of natural resources, University of Tehran, Karaj, Iran
author
Ali
Abdolkhani
Associate Prof., Department of wood and paper science and technology, Faculty of natural resources, University of Tehran, Karaj, Iran
author
text
article
2020
per
Bagasse carbohydrates, which are mainly consist of cellulose and hemicelluloses, are important raw materials in chemical industries; because they can be easily prepared from biomass in large scale, their application is simplified in large scale. Derivation and purification of biomass chemicals are difficult, costly and require the use of complex methods with environmentally dangerous chemicals and solvents. Therefore, researchers are looking for simpler, cheaper, safer and environmentally friendly compounds and processes. The use of deep eutectic solvents has been reported as one of these methods in biomass processing. In this study, the use of new oxalic acid-choline chloride and lactic acid-choline chloride deep eutectic solvents for bagasse treatment was investigated. Results indicated that these new solvents were effective in the solubilization and extraction of short-chain and amorphous carbohydrates, especially hemicelluloses; as the final processing yields were respectively reduced to about 50 and 59%, and the main part of degradation belonged to the hemicelluloses. Cellulose to holocellulose ratio was increased in all treatments to about 90%. The lactic acid-choline chloride solvent was effective in lignin solvation, as the lignin content was reduced to 6.2%, while oxalic acid-choline chloride solvent did not have an ideal efficiency toward lignin removal, and the least amount of lignin in treated product was about 11%. Also, the viscosity drop of cellulosic pulp in lactic acid-choline chloride solvent-treatment was much less compared to oxalic acid-choline chloride solvent-treatment, as the cellulosic pulp viscosity for these treatments were 11.1 and 4.3 cp., respectively.
Iranian Journal of Wood and Paper Industries
Iranian Scientific Association of Wood and Paper Industries
2008-9066
10
v.
4
no.
2020
559
573
https://www.ijwp.ir/article_35888_8b343b2e071a8859e2672fe62e750bca.pdf
The possibility of designing and constructing standard tables and chairs with palm trunk
Hadi
Gholamiyan
Assistant Prof., Department of wood and paper science and technology, Faculty of natural resources, University of Tehran, Karaj, Iran
Karaj, Iran
author
text
article
2020
per
In this research, the possibility of designing and constructing standard tables and chairs using palm tree trunk tissue for use in the furniture industry was evaluated. For this purpose, samples were cut to standard dimensions of 200×40×7 cm from dried palm (Phoenix dactylifera L.) and dried into a conditioning room (T = 25 °C and RH=65% ) for about 15 days to reach a moisture content of 12%. Then, to make the table and chair, the lumber was first cut into smaller boards and was made using two joints of mortise and tenon and wooden dowel of the structures. In addition, for assessing the profile edges, surface finishing, bending moment resistance, stability and durability of furniture, respectively, roughness test, mechanical testing, and furniture testing were conducted in accordance with Iranian national standards. The results of the roughness test showed that palm trunk tissue has ability to be well finished and with the increasing number of sanding, the number of surface roughness decreases. The highest resistance to bending moment capacity was related to the mortise and tenon joint and showed a 73% more resistance than the wooden dowel. Also, the results of the furniture test indicated that the tables and chairs made and designed and using palm has the strength, durability and safety requirements of the seat in accordance with national and international standards. Therefore, palm tissue can be used to make furniture; however, the used joints should be of mortise and tenon.
Iranian Journal of Wood and Paper Industries
Iranian Scientific Association of Wood and Paper Industries
2008-9066
10
v.
4
no.
2020
575
587
https://www.ijwp.ir/article_35962_895fbbb972821b1cf5d50d1ce949693f.pdf
Investigation of performance and fracture monitoring of dowel-welded joint by micrographs of scanning electron microscopy
PANTEA
OMRANI
Assistant Prof., Wood science and technology department, The faculty of civil engineering, Shahid Rajaee Teacher Training university, Tehran, Iran
author
text
article
2020
per
The aim of this study is to investigate the performance and fracture monitoring of dowel-welded joints by micrographs of scanning electron microscopy (SEM). In this regard, joints with hornbeam (Carpinus betulus) and fir (Abies alba) members were constructed by using hornbeam smooth and grooved dowels with diameter of 10 and 12 mm. The joint members were cut according to EN 326-1 standard and after assembling, the joints were subjected to the tensile test according with EN 319 standard. The results showed that effects of independent variables on tensile strength was significant. The investigation of the scanning electron microscope images from the fracture zone of the welded joint member demonstrated that not only the fracture at the joint zone was not occurred, but also the welded area between the dowel and the joint member exhibited greater strength in comparison with wooden members during tensile loading. Also, the investigation of the image obtained from the SEM showed that the components of the welding line did not remain on the dowels with smooth surface, and the dowel surface was also affected by micro cracks, but the surfaces of grooved dowels were sound and part of the welding line was observed on the dowels. According to the results of this study, compared to conventional adhesives, using of welding in making joints with small diameter and smooth dowel, not only provides a joint with the proper structural performance, but also it provides optimum utilization of wood in making joint. This leads to raw materials savings, cost reduction of raw materials preparation and reduction of jointing time which altogether cause to reduce production costs.
Iranian Journal of Wood and Paper Industries
Iranian Scientific Association of Wood and Paper Industries
2008-9066
10
v.
4
no.
2020
589
603
https://www.ijwp.ir/article_35976_0bce1b9b8bbec1c5989745367c3abbb4.pdf
Effect of cationic polyDADMAC-based fixing agent on strength properties of OCC pulp
Ali
Ahmadi Ladjimi
M.Sc., Department of wood and paper science and technology, Faculty of natural resources, University of Tehran, Karaj, Iran
author
Mohammad
Azadfallah
Assistant Prof., Department of wood and paper science and technology, Faculty of natural resources, University of Tehran, Karaj, Iran
author
Yahya
Hamzeh
Professor, Department of wood and paper science and technology, Faculty of natural resources, University of Tehran, Karaj, Iran
author
Mehdi
Rahmaninia
Associate Prof., Department of wood and paper science and technology, Faculty of natural resources, Tarbiat Modares university, Noor, Mazandaran, Iran
author
text
article
2020
per
Stickies are one of the main challenges in the papermaking industry, especially in recycling process of old corrugated containers (OCC). Application of a fixing cationic polymer is one of the main approaches to control these harmful substances. However, it is obvious that these agents besides fixing characters could also influence the final product properties. Therefore, in this study, the effect of using an industrial cationic polymer i.e. GL, as a stickies control agent on mechanical properties of hand-sheets made of OCC fibers, was assessed at three levels of 0.4, 0.8 and 1.2% (based on pulp dry weight) and at two pH ranges of 4 and 7. The characterization of the GL by FT-IR spectroscopy demonstrated that it was synthesized based on poly (diallyldimethylammoniumchloride). The results showed that use of the cationic polymer enhanced the strength properties of the hand-sheets by influencing formation and inter- fiber bonding through fixing and flocculating the stickies and fines into the fibers network. These respective enhancements were measured at pH ranges of 4 and 7 as follows: Tensile strength of 35 and 30%, burst strength of 12 and 10%, ring crush test (RCT) of 29 and 21%, Concora medium test (CMT) of 19 and 32% and tear strength of 10 and 13%. It can be concluded that 0.4 % GL cationic fixing agent could be proposed as optimum value at pH =7 for industrial applications.
Iranian Journal of Wood and Paper Industries
Iranian Scientific Association of Wood and Paper Industries
2008-9066
10
v.
4
no.
2020
605
616
https://www.ijwp.ir/article_35978_50ebf68d0bb2381421fb0fa31860be89.pdf
Comparison of non-woody biomass properties for energy generation
saeid
Mahdavi
Associate prof., Wood and forest products division, Research institute of forest and rangelands, Karaj, Iran
author
text
article
2020
per
The calculation of heating value is one of the most important properties of biomass fuels to calculate the design or simulation of thermal conversion systems for energy production from biomass. Biomass with higher thermal energy value and optimal composition is more desirable for the systems. In present investigation, properties of eight types of non-woody biomass relevant to combustion were evaluated. Important characteristics requiring analysis were moisture and ash content, volatile matter, elemental composition (C, H, N, S, and O), high and low heating values (HHV and LHV) of these residues. The heating value has been evaluated based on experimental (by colorimeter bomb) and computational methods. The content of sulfur is a limiting factor for environmental pollution and was higher than other reports. The high percentage of ash in bagasse Pith requires the use of it as mixing with bagasse in order to increase the efficiency of the energy production system. It is recommended to mix bagasse pith with bagasse due to the high amount of ash in order to increase the efficiency of energy conversion systems. Regarding to the volatile matter, bagasse and reed are superior to the rest of biomass to produce energy by gasification system. The highest heating values were obtained for corn straw and bagasse and the lowest heating values were for bagasse pith and rice straw, respectively. There is good correlation between the methods of heating value determination, so it shows that the proper computational model has been used.
Iranian Journal of Wood and Paper Industries
Iranian Scientific Association of Wood and Paper Industries
2008-9066
10
v.
4
no.
2020
617
628
https://www.ijwp.ir/article_36243_a8c7f1c03ad5add1fb27575fa813c349.pdf
The effect of nano graphene particles on the Physical and mechanical of high density polyethylene-rapeseed stalk flour composites
Zahra
Yari Firouzabadi
M.Sc. student, Wood composite products, Gonbad Kavous university, Gonbad Kavous, Iran
author
vahid
vaziri
Assistant Prof, Wood and paper science and technology, Gonbad Kavous university, Gonbad Kavous, Iran
author
behzad
kord
Assistant Prof, Wood and paper science and technology, Cellulose and packaging research group, Institute of chemistry and petrochemical, Standard research institute, Karaj, Iran
author
loya
jamalirad
Assistant Prof, Wood and paper science and technology, Gonbad Kavous university, Gonbad Kavous, Iran
author
text
article
2020
per
The purpose of this study, was to investigate the effect of graphene nanoparticles (NG) on mechanical properties of composites made from rapeseed stalk flour (RSF) and high density polyethylene (HDPE). To meet this objective, the RSF and HDPE at 50 wt%, coupling agent (3phc) and various amounts of NG (0, 0.5, 1, 1.5 and 2 phc) were mixed via hake internal mixer, and then the specimens were prepared using injection molding. The morphology of samples was characterized using field emission scanning electron microscope (FE-SEM). The physical and mechanical characterization including water absorption, thickness swelling, tensile, flexural strength, and unhocked impact resistance were performed. In addition, the field emission scanning electron microscope (FE-SEM) was used to study the distribution of graphene nanoparticles in the composite. The results showed that by increasing the amount of nanographene the tensile modulus, flexural modulus, tensile strength, and flexural strength of the composite were increased while the impact strength, water absorption and thickness swelling of the samples decreased.FE-SEM micrographs showed that the using of 1 wt% NG improved the adhesion between the filler and the polymer matrix. However, in the higher amount contents (>1%), nanographene particles tend to accumulate.
Iranian Journal of Wood and Paper Industries
Iranian Scientific Association of Wood and Paper Industries
2008-9066
10
v.
4
no.
2020
629
641
https://www.ijwp.ir/article_37408_532ab8c77633d817d9af630aa62c8f4c.pdf