Investigation on the Influence of Paper Making Variables on Apparent Density of Paper Produced From Old Corrugated Container
Omid
Ramazani
Ph.D. student at Wood and Paper Science and Technology, University of Tehran
author
Ahmad
Jahan latibari
Islamic Azad University, Karaj, Iran
author
Mohammad mehdi
Faezipoor
Prof., Wood and Paper Science and Technology, Tehran University
author
Ali akbar
Enayati
Associate Prof. of Natural Resources College of Tehran University
author
Sayed mehdi
Manzor alajdad
Associate Prof. Wood and Paper Science and Technology, University of Tehran Manager, Research and Development Dept. Iran Wood and Paper Industries
author
text
article
2007
per
Apparent Density of paper is the most effective physical property which directly and indirectly affects most of the strength and optical properties of paper such as tensile strength, modulus of elasticity, light scattering coefficient as well as the bonded area between fibers. Since paper making variables influences the apparent density of paper, in this study, the influence of OCC pulp freeness, and drying conditions are investigated. The influence of three freeness levels of 350,450, and 550 CSF, drying under strain and unstrained, drying temperatures of 100, 150, 200 C and drying pressure of 7 and 10 kg/cm2 are studied. The relationship between paper making variables and apparent density is developed. All measurements of apparent density were analyzed using Minitab 15 and regression model between independent variables was calculated. The results showed that both pulp freeness and drying temperature had the highest impact on apparent density and both factors increased the apparent density. The response of apparent density of the hand sheets dried at 200 ◦C varied considerably and was analyzed thoroughly. Higher pressure increased apparent density of the sheets. The combined effect of variables is also considered. The combined effect of pulp freeness and drying temperature caused lignin softening and delamination. However, the influence of increasing the drying pressure for unrefined and less refined pulp is not significant. Furthermore, for unstrained drying, the influence of freeness on apparent density was more than strained drying. Manufacturing of more desirable quality papers would be possible considering the obtained results and the effect of Apparent Density on paper strength properties.
Iranian Journal of Wood and Paper Science Research
Research Institute of Forests and Rangelands
1735-0913
22
v.
1
no.
2007
1
17
https://ijwpr.areeo.ac.ir/article_117417_cf52a52bc6def59aebef255ffc05c5fc.pdf
dx.doi.org/10.22092/ijwpr.2007.117417
Effect of Acetylation on Physical and Mechanical Properties of Prticleboard
Yasamin
Khosrevani
B.Sc. Scholar, Wood and Paper Science & Technology
author
Ali akbar
Enayati
Assoc. prof. of Natural Resources College of Tehran University
author
Alinaghi
Karimi
Assoc.Prof., Natural Resources Faculty of Tehran University
author
Behbood
Mohebi
Assis.Prof., Natural Resources and Marine Science Faculty of Modarres University
author
text
article
2007
per
The effects of different levels of wood particles acetylation and resin content on the physical and mechanical properties of particleboard were investigated. Boards were made within 6 treatments at three different levels of acetyl content (WPGs of 0%, 5.11% and 10.76 %) and two levels of resin content (8 and 10 %).The results indicated that by increasing the level of particles acetylation, the density of boards was reduced whereas resin content increased this property. Equilibrium moisture content, water absorption and thickness swelling of the boards were reduced by 15.3%, 26.6% and 14.9%, respectively under optimum conditions as compared with control samples at higher acetylation levels and resin contents.MOR, MOE and IB decreased by increasing acetylation level but increasing resin content from 8 to 10 %, improved mechanical properties except for MOR which was not significantly affected by resin content. The result of this research have indicated that using 5.11% acetylation level and 10% resin content, it is possible to produce particleboard having enhanced physical properties with negligible loss of mechanical properties.
Iranian Journal of Wood and Paper Science Research
Research Institute of Forests and Rangelands
1735-0913
22
v.
1
no.
2007
18
28
https://ijwpr.areeo.ac.ir/article_117418_9ee3fd8a658a73ddb67e1213c22e2ad0.pdf
dx.doi.org/10.22092/ijwpr.2007.117418
The Study of Fiber Fines and Its Effects On Optical and Physical Propertie of Newsprint Paper from CMP Pulp
Amir mohsen
Nazeri
Former Granduate student of wood and paper Science and Technology, Faculty of Natural Resources, Tehran Azad University, Science and Research Campus
author
Mohammad
Talaeipoor
Assistant Professor Faculty of Natural Resources, Tehran Azad University, Science and Research Campus
author
Seeyed Ahmad
Mirshokraie
Professor , Chemistry Department, Payame noor Univrsity.
author
text
article
2007
per
The present study deals with effects of CMP fines on optical and physical properties of newsprint papers, for which, different batches for CMP fines (0%, 10%. 20%. 30%) of totally 80% pulp is taken, Where the remaining 20% of imported long fiber pulp was taken as fixed amount .
The study focused on surving the effects of CMP fines on optical and physical properties of newsprint paper ,after mixing the pulps and making the handsheets .
Generally, the results show the increase in CMP fine amount lead to increase ,Air Resistance and Opacity and decrease Caliper and Roughness, Also that changes in CMP fines has no effect on Brightness .
Iranian Journal of Wood and Paper Science Research
Research Institute of Forests and Rangelands
1735-0913
22
v.
1
no.
2007
29
40
https://ijwpr.areeo.ac.ir/article_117419_e2b031f0d64c86085e962ca81aa5c577.pdf
dx.doi.org/10.22092/ijwpr.2007.117419
Variation in Mechanical properties of oak
(Quercus castanefolia C.A.Mey) wood grown of Shafarod Forests (Gilan), Iran
Fardad
Golbabaei
Wood and Forest Products Science Research Division, Research Institute of Forests and Rangelands,
Agricultural Research Education and Extension Organization (AREEO) P.O. Box 13185-116, Tehran, Iran
author
Ghanbar
Ebrahimi
Professor, Wood and Paper Science, Faculty of Natural Resources, University of Tehran
author
Abolfazl
Kargarfard
Wood and Forest Products Science Research Division, Research Institute of Forests and
Rangelands, Tehran, Iran,
author
Abbas
Fakhryan roghani
MSc., Wood and Paper Science Research Division, Research Institute of Forests and Rangelands , Iran,
author
text
article
2007
per
Oak (Quercus castaneafolia C.A. Mey) is one of the most important broadleaf species in the Caspian Forests of Iran. The wood of oak is highly appreciated in domestic wood industries especially furniture industry.
In this study which is a part of the extensive surveying project of the main wood engineering properties of Iranian woods, the natural variations of strength and related properties of two trees of about 70 years old from Shafarod Forests in Gilan province were investigated.
The properties were determined from tests on small clear specimens in the green and dry conditions following the ASTM Standard. The mechanical and physical properties studied include: stress at elastic limits, modulus of rupture, modulus of elasticity and modulus of elasticity in static bending; shear parallel to grain, maximum crushing strength, fiber stress at proportional limit and modulus of elasticity in compression parallel to grain; compression perpendicular to grain and specific gravity.
The results of statistical analysis showed that the mechanical strength of the wood was found to be affected by percentage of moisture content of wood specimens, height of sample tree and to some extend by geographical; cal direction.
Iranian Journal of Wood and Paper Science Research
Research Institute of Forests and Rangelands
1735-0913
22
v.
1
no.
2007
41
50
https://ijwpr.areeo.ac.ir/article_117420_83d06e348b3703a0b42b564d48edaf61.pdf
dx.doi.org/10.22092/ijwpr.2007.117420
The effect of press time and resin content on properties of MDF produced
from Rice straw
masoudreza
habibi
Wood and Paper Science Research Division, Research Institute of Forests and Rangelands , Iran,
author
Hossein
Hosseinkhani
Wood Science & Forest Products Research Division
Research Institute of Forests & Rangelands Tehran, Iran
author
Saeed
Mahdavi
Wood and Paper Science Research Division, Research Institute of Forests and Rangelands , Iran,
author
text
article
2007
per
In this study, MDF was produced from Rice straw. Variables for Medium Density fiberboard making were as following:
- Resin content 8, 9.5, 11 (percent baced on oven dry weight of fiber)
- Press time (4, 5, 6 minutes).
There were 9 treatment conditions by combinations of the above factors and three replications for each combinations which resulted in producing 27 boards.The other production variables were constant.
The anatomical properties of Rice straw such as fiber length, fiber diameter were measured respectively 810, 10.1 micron. L/D ratio of Rice straw fiber was measured 80.2. The physical and mechanical properties of MDF were determined according to DIN standard. The measurements of bending properties and IB of MDF revealed that the highest MOR, MOE, IB were obtained in variables combination of 11% resin content and press time of 6 minute and at this conditions thickness swelling of boards were the lowest.
According to Duncans, test method the effects of press times (4 & 5 minutes) and resin content (8% & 9.5%) on bending properties were not significant statistically.
Iranian Journal of Wood and Paper Science Research
Research Institute of Forests and Rangelands
1735-0913
22
v.
1
no.
2007
51
61
https://ijwpr.areeo.ac.ir/article_117421_e121395a9f52f96980fb0ef9c7f2b0dc.pdf
dx.doi.org/10.22092/ijwpr.2007.117421
Study on Termites Resistance of Oak Wood by Field test stakes
Ali
Rezanzhad
Wood and Paper Science Research Division, Research Institute of Forests and Rangelands
author
Habib alah
Arabtabar
Wood and Paper Science Research Division, Research Institute of Forests and Rangelands
author
text
article
2007
per
With the aim of measuring the durability of Oak (Quercus castaneafolia), 2x2x45 cm samples were prepared. The treatments were included natural and impregnated with Celcure and creosote. Wood samples with 20 replication installed in 2 zones included Qom and Khozestan provinces. Evaluation of samples were done qualitatively and based on ASTM D-1758-01. According to the results of periodically evaluation, Oak wood is “perishable”. All of the Celcure impregnated samples after 60 months and Creosote impregnated samples after 36 months installation in Khozestan, Celcure and creosote impregnated after 41 months in Qom were sound. Stating on longtime result of wood preservative effect needs more investigation.
Iranian Journal of Wood and Paper Science Research
Research Institute of Forests and Rangelands
1735-0913
22
v.
1
no.
2007
62
72
https://ijwpr.areeo.ac.ir/article_117422_a1e858b95274aeb1129581a5c374dcd2.pdf
dx.doi.org/10.22092/ijwpr.2007.117422