As alterações pulpares e periapicais decorrentes de sobrecarga oclusal são problemas que acometem considerável parcela da população. Geralmente causadas por contato prematuro de restaurações com material em excesso, provocam um trauma de baixa intensidade, porém de alta frequência. Objetivo: Avaliar as alterações pulpares e periapicais, induzidas por esta sobrecarga oclusal associada ou não à doença periodontal induzida em dentes de ratas. Método: Foram utilizadas vinte ratas (Wistar) com noventa dias de idade e peso aproximado de 250g divididas em quatro grupos (n=5): GC (controle), GT (trauma), GL (ligadura) e GLT (ligadura e trauma), com sobrecarga oclusal e periodontite induzida restritas aos primeiros molares inferiores, que receberam a ligadura. As superfícies oclusais dos segundos e terceiros molares superiores receberam desgastes, sem que houvesse exposição pulpar e os animais foram observados por um período de quatro semanas. Depois de anestesiados, estes foram decapitados com uma guilhotina e, após a eutanásia, as hemi-mandíbulas foram enviadas para a análise histológica do tecido pulpar e periapical, com coloração por hematoxicilina-eosina, para avaliação da presença de nódulos pulpares, lacunas de reabsorção e células inflamatórias, além de submetidos à análise histoquímica pela Fosfatase Ácida Tartarato Resistente (TRAP) para avaliação da presença de células clásticas e pré-clásticas. Resultados: Histologicamente, os dentes submetidos à ligadura apresentaram presença moderada de fibras e vasos, enquanto os submetidos ao trauma e ao conjunto trauma-ligadura apresentaram grande aumento de vasos e fibras além de infiltrado neutrofílico e, por vezes, nódulos. Histoquimicamente, notou-se certa normalidade no GC, uma irregularidade na região cervical externa no GL e maior presença de lacunas dentinárias e células multinucleadas no GT e GLT. Conclusão: A sobrecarga oclusal provoca alterações pulpares e periapicais assim como a doença periodontal induzida. Mas a associação da doença periodontal e da sobrecarga é mais lesiva aos tecidos pulpares e radiculares. / Pulp and periapical changes resulting from occlusal overload are problems that affect a considerable portion of the population. Generally caused by premature contact of restorations with material in excess, cause a trauma of low intensity, however high frequency. Objective: To evaluate the changes of pulpal and periapical induced by this overload occlusal associated or not to the induced periodontal disease in teeth of rats. Method: Used twenty rats (Wistar) with ninety days old and weighing approximately 250g divided into four groups (n = 5): GC (control), GT (overload), GL (ligature) and GLT (ligature and overload) with occlusal overload and induced periodontitis restricted to lower first molars, which received the ligature. The occlusal surfaces of upper second and third molars were worn away, with no pulp exposure and the animals were observed for a period of four weeks. Once anesthetized, they were beheaded with a guillotine and, after euthanasia, the hemi-mandibles were sent for histological analysis of pulp and periapical with hematoxylin-eosin staining for evaluation of nodules pulp, resorption gaps and inflammatory cells, and analyzed by immunohistochemistry Tartrate Resistant Acid Phosphatase (TRAP) for assessing the presence of clastic cells and pre-clastic. Results: Histologically, the teeth underwent to ligature showed the presence of fibers and vessels, while the other submitted to overload and overload-ligature group showed a large increase in vessels and fibers as well as neutrophil infiltration and sometimes nodules. Histochemically, it was noted some degree of normality in the GC, an irregularity in the external cervical region in the GL and greater presence of dentinal gaps and multinucleated cells in the GT and GLT. Conclusion: The occlusal overload causes changes pulp and periapical as well as induced periodontal disease. But the association between periodontal disease and the overload occusal is more damage to pulp and root tissues.

Indiana University-Purdue University Indianapolis (IUPUI) / The effects of hydroxyapatite in a DAP-loaded MC carrier on dental pulp stem cells Introduction: Regenerative endodontic procedures (REP) require disinfection techniques to eliminate bacteria from the infected immature root canal system and promote new growth of the pulp-dentin complex. Double antibiotic paste (DAP), a mixture of ciprofloxacin and metronidazole, has shown efficacy in doing so while minimizing cytotoxicity on dental pulp stem cells (DPSC). Stem cells, scaffolding, and growth factors are necessary in the maturation, proliferation, and differentiation of mesenchymal stem cells into the root canal system. Nano-hydroxyapatite (n-HA) has a history of biocompatibility and, in addition, has shown promising effects as a tissue bioengineering material. Objective: The aim of this in vitro study was to investigate the proliferation and mineralization of DPSC in the presence of 1% DAP and methylcellulose (MC) with varying concentrations of nano-hydroxyapatite. Materials and Methods: DPSC were plated in 24-well plates containing culture media. The next day, semi-permeable 0.1 mm Transwell chambers were inserted into the wells to separate the reservoirs for medicaments. Treatment paste composed of methylcellulose containing 1% DAP with either 0.25%, 0.50%, or 1.0% nano-hydroxyapatite was added along with culture media. Methylcellulose alone and calcium hydroxide (Ultracal) were used as control groups. After 3 days, cells were evaluated for cytotoxic effects using an MTS proliferation assay (n = 10, in triplicate). DPSCs were also cultured with these medicaments for 7 days in osteogenic media and evaluated for alkaline phosphatase (ALP) activity and mineralization activity (n = 13, in triplicate). Comparisons between groups for differences in mineralization, BSA, and ALP activity were performed using analysis of variance (ANOVA), with different variances allowed for each group and a random effect included in the model to account for correlation within each of the three trials. A simulation-based model was used to adjust for multiple comparisons. Results: Addition of n-HA treatment groups increased mineralization significantly greater than calcium hydroxide, with MC alone and MC+DAP+0.5% HA providing the greatest effect. Regarding ALP, all HA concentrations performed significantly greater than MC and DAP concentrations. Proliferation demonstrated similar metabolic activity in all experimental groups with few comparisons significant. Conclusion: The challenge in REPs is to maintain survival, and preferably promote the proliferation and development of DPSCs into the pulp-dentin complex with a consistent treatment outcome. The combination of DAP with hydroxyapatite may allow for both disinfection and improved mineralization and cellular differentiation. This contribution has shown significant ability to increase stem cell differentiation into an osteogenic lineage as well as calcium deposition, indicating end goal results of regenerative procedures.

The aim with this project was to investigate how the amount and composition of resins varied during the process producing bleached birch pulp at the mill SCA Packaging Munksund. A literature study about how the resin removal can be improved has also been included. Problems with resins in the process are common at pulp and paper mills, especially when birch is used as a raw material. The resin can cause deposits on the equipment leading to process stops, but also lowered mechanical properties and spots on the paper products. The addition of tall oil to the digester is one way of improving the removal of resins, seasoning of wood, and a good debarking are other ones. Also the different washing and bleaching steps can affect the amount of resin remaining in the pulp. In this study pulp samples from eight different positions in the process were analyzed. To extract the samples a Soxtec device was used. Results showed that the most effective resin removal happened during the washing in their first washing step after the digester, a DD-washer. Here 77 % of the resin was removed, of totally 88 % during the whole process. Another step which was effective was the final washing step, the PO-press. About 36 % of the remaining resins in the pulp which entered the PO-press were washed out here. The extracts were analyzed with GC-FID and GC-MS to identify and quantify the substances, and determine how the composition varied over the manufacturing process. Twelve different compounds were identified, and the birch bark resin, betulinol, turned out to be the hardest component to remove. Over all, the sterols and triterpenols were hard to deresinate, while the removal of resin acids, fatty acids, and fatty alcohols was more effective. The PO-reactors showed a positive effect on the fragmentation of components consisting of long carbon chains and double bonds, like squalene and betulaprenols. / Målet med projektet var att utreda hur mängden och sammansättningen av hartser varierade i den blekta björkmassan under tillverkningsprocessen på pappersbruket SCA Packaging Munksund. Att göra en litteraturstudie för att ta reda på vilka metoder som kan användas för att förbättra avhartsningen var en annan del av målet. Att pappers- och massatillverkare har problem med hartser är vanligt, speciellt när björkved används som råmaterial. Hartserna kan orsaka beläggningar på utrustningen som i sin tur kan leda till processtop, men även prickar och försämrade mekaniska egenskaper hos pappersprodukten. Att tillsätta tallolja till kokaren är en vanlig metod som används för att förbättra hartsreningen, att lagra träet innan koket, och lägga fokus på att förbättra barkningen är andra metoder. Även de olika blek- och tvättstegen som används under tillverkningen av massan kan påverka hartshalten. I denna studie analyserades massaprover från åtta olika positioner i processen. En Soxtec-utrustning användes för att extrahera massaproverna. Resultatet visade att den mest effektiva avhartsningen sker under tvätten i det första tvättsteget efter kokaren, DD-filtret. Här tvättades 77 % av hartserna ut, och totalt minskade mängden hartser med 88 % under hela processen. PO-pressen var ett annat tvättsteg som var effektivt ur avhartsningssynpunkt. Här togs 36 % av den kvarvarande mängden hartser bort från massan. Extrakten som erhållits från extraktionen analyserades vidare med GC-MS och GC-FID. Dessa metoder användes för att identifiera och kvantifiera extraktivämnena, och bestämma hur sammansättningen varierade under tillverkningsprocessen. Tolv olika ämnen identifierades och den substans som visade sig vara svårast att tvätta bort var björkbark hartset, betulinol. Stort sett så var steroler och triterpenoler svårast att bli av med, medans avhartsingen av hartssyror, fettsyror och fettalkoholer var mer effektiv. Det visade sig även att PO-reaktorerna hade en sönderdelande effekt på substanser såsom squalen och betulaprenoler, dessa består av långa kolkedjor med många dubbelbindningar mellan kolatomerna.

Renewable lignocellulosic materials are promising green plastic alternatives to fossil fuel-based plastics. However, the hydrophilic nature and poor water resistance of lignocellulosic materials have hindered their practical applications. This study reports a facile metal-ion-modification (MIM) route, swelling with aqueous metal ion solutions, and drying to convert conventional hydrophilic paper and wood pulp into biodegradable hydrophobic paper and tableware without the addition of hydrophobic sizing chemicals/materials. Metal ions such as Fe3+ and Zr4+ can coordinate with pulp fibers’ polar groups (i.e., O.H., C=O, and COOH) that induce self-assembly of their surface fibrillated “hairy” cellulose nanofibrils to form a more compact structure with fewer available O.H. groups for water sorption. The formation of coordination bonds with polar groups (i.e., O.H., C=O, and COOH) decreases the surface energy of pulp fibers and increases their hydrophobicity and water resistance. Only ~3 mg of metal ions is needed to induce the wettability transition in 1 g of kraft pulp, resulting in hydrophobic paper and tableware with water contact angles (WCAs) of 120-140° and displayed wet tensile strengths of up to 9.5 MPa, and low water absorbency, which were comparable to synthetic polymer films. This MIM technique can be integrated into the existing paper-making process for the scalable production of hydrophobic papers and tableware, providing an alternative route for developing sustainable and biodegradable plastic counterparts. The MIM-induced lignocellulose hydrophobization mechanisms were elucidated using X-ray photoelectron spectroscopy (XPS), Fourier transforms infrared spectroscopy (FT-IR), and scanning electron microscopy-energy dispersive spectroscopy (SEM-EDS), and density functional theory (DFT). Furthermore, this MIM technique was also evaluated for its applicability in wood treatment. The treatment effectively tunes the wood surface from hydrophilic to hydrophobic, enhancing its water resistance. The MIM treatment significantly improved the dimensional stability of SYP, red oak, and poplar. For example, the Fe3+ treatment reduced the tangential swelling of SYP, poplar, and red oak by 57%, 50%, and 40%, respectively. Overall, this eco-friendly and facile MIM method holds promise for developing sustainable and biodegradable alternatives to conventional plastics, contributing to a more environmentally friendly future.

Indiana University-Purdue University Indianapolis (IUPUI) / Introduction: Profound pulpal anesthesia is not always adequate in mandibular teeth after the administration of local anesthesia, especially in the presence of irreversible pulpitis. Failure to achieve anesthesia has been seen in 30–80% of patients in teeth with a diagnosis of irreversible pulpitis. Onpharma™ developed an FDA-approved device that uses sodium bicarbonate to buffer a standard local anesthetic (LA) solution so that its pH may become closer to its pKa. Claims have been made that buffering a local anesthetic increases the anesthetic’s effect. Previous studies on the anesthetic efficacy of Onpharma’s Onset buffering system were inconclusive and may be dependent on the techniques used. Objectives: The aim of this study is to determine whether a buffered local anesthetic can lead to more profound and faster pulpal anesthesia in mandibular molars diagnosed with symptomatic irreversible pulpitis as compared to a standard, unbuffered local anesthetic. Materials and Methods: 40 total subjects completed the study. Screened and eligible subjects with a mandibular molar diagnosed with symptomatic irreversible pulpitis were randomly allocated into 2 groups so 1 group received a total of 3 cartridges of a standard, unbuffered 2% lidocaine with 1:100,000 epinephrine via inferior alveolar nerve block (IANB) followed by supplemental buccal and lingual infiltrations, while the other received the equivalent yet buffered formulation. An electronic pulp tester (EPT) was used to objectively determine baseline pulpal status of the affected tooth, followed by 2-minute interval testing following the administration of all local anesthesia. The onset of pulpal anesthesia was defined by the first of 2 consecutive EPT=80 readings, and the endodontic treatment could begin. Profound pulpal anesthesia was ultimately determined if the patient reported a comfortable pulpotomy as reflected on the Wong-Baker FACES Visual Analog Scale. Null Hypothesis 1: Subjects possessing mandibular molars diagnosed with symptomatic irreversible pulpitis will not achieve pulpal anesthesia more profoundly using buffered 2% lidocaine w/ 1:100,000 epinephrine in comparison to the standard, unbuffered anesthetic formulation. Null hypothesis 2: Subjects possessing mandibular molars diagnosed with symptomatic irreversible pulpitis will not achieve pulpal anesthesia faster using buffered 2% lidocaine w/ 1:100,000 epinephrine in comparison to the standard, unbuffered anesthetic formulation. Results: We observed a local anesthetic success rate of 45% in the buffered group, 70% in the unbuffered group, and ultimately 57.5% between both groups. The findings further indicate that the VAS scores after pulpotomy is significantly different between the 2 groups (p=0.019), with the unbuffered group having a more profound mean VAS score of 1.2 (as opposed to a buffered mean of 3.1). Regarding the time of onset for pulpal anesthesia, there was no statistically significant difference noted between the buffered and unbuffered groups. Conclusion: Based on the findings of this study, the null hypothesis 1 cannot be rejected since unbuffered 2% lidocaine with 1:100,000 epinephrine had a statistically significant increase in profound pulpal anesthesia compared to the buffered equivalent. The null hypothesis 2 cannot be rejected since there was no evidence of a significant difference in the time to pulpal anesthesia between the buffered and unbuffered groups.

Today, a huge part of waste products from pulp and paper industries ends up in landfill which is both economically and environmentally adversely. This report examines the possibilities of using those products as a slag foamer and fuel in different furnaces in the metal industry. The waste products contain valuable elements, especially carbon. Therefore, there is an increased interest in finding possible use for the waste products in the metal industry. The reuse would contribute to preservation of energy as fossil fuel can be replaced. In the report, two waste materials called mixed biosludge and fiber reject are examined. The experiments are performed with the waste products pressed together with a base material and cement forming a briquette. The requirements examined are strength needed for both transportation and use in furnaces and ability to create a foaming slag. The results in strength were ambiguous, no waste material based briquettes met the set criteria. As of now, the briquettes are probably not strong enough to be transported. No foaming occurred during the experiment, but only one experiment was performed. Therefore, further experiments are needed before any conclusions can be drawn. The briquettes can possibly replace coke and coal in applications where strength is not as important. Nevertheless, it is uncertain if the briquettes affect the steel quality. / Idag läggs en stor del av restprodukter från pappers och massaindustrin på deponi, vilket innebär såväl ekonomiska som miljömässiga nackdelar. Den här rapporten undersöker möjligheterna att använda dessa restprodukter som slaggskummare och bränsle i de olika ugnarna inom metallindustrin. Restprodukterna innehåller värdefulla ämnen, framförallt kol. Därför finns det ett ökat intresse för att hitta möjliga användningsområden för restprodukterna inom metallindustrin. Denna återanvändning skulle bidra till energibevarande eftersom fossila bränslen kan ersättas. I den här rapporten undersöks två restmaterial, blandat biologiskt slam och fiberavfall. Experimenten utfördes med dessa restprodukter pressade samman med ett basmaterial och cement till en brikett. Kraven som undersöks är styrka för både transport och användning i ugnarna samt förmågan att skumma en slagg. Resultaten för briketternas styrka var tvetydiga, inga av briketterna innehållande restprodukter satisfierade det uppsatta kriteriet. Styrkan är troligtvis för låg för att transport ska vara möjlig. Ingen skumning skedde under experimentet, men endast ett experiment genomfördes. Därför behöver ytterligare experiment genomföras innan några slutsatser kan dras. Men briketterna tros kunna ersätta koks och kol där styrkan inte är viktig. Men det är osäkert om briketterna påverkar stålkvaliteten.

Cellulose is the most abundant organic polymer on Earth and a fascinating compound for a vast variety of applications. It is mostly received from wood, thus it is a renewable resource and a CO2 storing material. One of the most important cellulose products are pulp and paper. The major goal of this work was to obtain a material with a high amount of cellulose through a pulping process of wood. Therefore, it is necessary to separate the wood bers and to remove a component of wood, which is called lignin (deligni cation). The conventional way to delignify wood is the Kraft process that causes serval problems like contamination of lignin with sulfur and the emission of toxic volatile sulfur compounds. Hence, there are alternative processes without sulfur, such as the Acetosolv process. It uses simple chemicals like acetic acid and is easy to handle. After cutting a spruce tree (Picea abies L. Karst.), debarking and chipping, the wood chips were cooked in the laboratory. The research included the chemical analysis of the obtained pulp and the manufacturing and testing of paper sheets. The yield of pulp ranged widely due to the di erent parameters of the cooking. FT-IR and Raman spectroscopy were used to observe the decrease of aromatic substances (lignin) and the acetylation of the pulp. With the means of Design of Experiments and statistical analysis the most important factors were identi ed and a mathematical regression model was calculated. The manufactured paper sheets showed good mechanical properties and high transparency. Finally, the Acetosolv process could be considered as a contribution to the upcoming bio-based economy because, in addition to the cellulose bers, the industry would be capable of adding value utilization of the separated lignin. It could be one step to a more sustainable paper and pulp production.

No description available.

Lignin är en av de vanligaste naturliga råvarorna på jorden och finns mestadels i trä. Nuförtiden är valoriseringen av lignin en av processutvecklingarna för teknologier inom massa- och pappersindustrin. Denna utveckling syftar till att öka värdet av lignin. Traditionellt förbränns genererat lignin, känt som tekniskt lignin, som bränsle i sodapannan som en del av svartlutskomponenter, och denna praxis är används kontinuerligt inom massa- och pappersindustrin. Syftet med detta examensarbete är att undersöka det tekniska ligninet från två specifika träslag, Acacia crassicarpa (Acra) och Eucalyptus Hybrids (Euca), för att öka kunskapen om det tekniska ligninet och hitta lämpliga tillämpningar för dessa råvaror i framtiden. I denna studie isolerades lignin från svartlut som genererats från två olika kokningsmetoder, kraftkokning- och kraftbased dissolvingkokning (KP och DP). Karakteriseringsmetoderna inkluderade molekylviktsfördelning (THF-SEC), analys av ligninets funktionella grupper med fosfor-31 Nuclear Magnetic Resonance (31P-NMR) kvantifiering och ligninets trukturella elementanalys via Two-Dimensional Heteronuclear Single Quantum Correlation NMR (2D-HSQC NMR). Utbytet erhållet från kraftkokning (KP) och kraftbased dissolvingkokning (DP) visade inga skillnader för samtliga prover och resultaten visas inom samma intervall (cirka 0,06-0,08 g/mol svartlut). Molekylviktsfördelningen för KP och DP-kokning ligger fortfarande inom intervallet för kraftlignin Mw (1500-5000 g/mol) och polydispersitetsindex (PDI) för KP hade ett högre värde än DP för båda typerna av undersökta råvaror. För de funktionella grupperna hade Eucalyptus Hybrids högre -OH-halt än Acacia crassicarpa oavsett kokningstyp. 31P-NMR kvantifieringsdata visade tydligt att KP-Euca innehöll den högsta halten av  alifatisk-OH (1,4 mmol/g). DP-Euca hade den högsta halten C5-kondenserad (2,5 mmol/g), medan den högsta mängden Guaiacyl-OH identifierades i DP-Acra (1,2 mmol/g). Fingeravtrycket av kopplingarna som kvantifierades från 2D-NMR HSQC visade att KP hade högre β-O-4', β-5' och β-β' interenhetskopplingar än DP. Dessutom hade Acacia crassicarpa en högre andel interenhetskopplingar än Eucalyptus Hybrids för båda kokmetoderna. De högsta β-O-4'-, β-5'- och β-β'-kopplingarna detekterades i KP-Acra med 3,4 %, 0,5 % respektiv 4,3 %. / Lignin is one of the most abundant natural raw materials on Earth and is mostly found in wood. Nowadays, the valorization of lignin is one of the continual process developments for technologies in the pulp and paper industry. This development is intended to increase the value of lignin. In the traditional approach, generated lignin known as technical lignin is burnt as fuel in the recovery boiler as part of black liquor components, and this practice is still common in the pulp and paper industry. The objective of this thesis work is to explore the technical lignin from specific wood species, Acacia crassicarpa (Acra) and Eucalyptus Hybrids (Euca), to emphasize the knowledge about the technical lignin and finding suitable application for the mentioned raw materials in the future. In this study, lignin was isolated from black liquor generated from two different cooking methods, kraft and kraft dissolving pulp cooking (KP and DP). The Characterization methods included molecular weight distribution by THF-SEC, lignin functional groups analysis via Phosphorus-31 Nuclear Magnetic Resonance (31P-NMR) quantification, and lignin structural elements analysis via Two-Dimensional Heteronuclear Single Quantum Correlation NMR (2D-HSQC NMR). The isolation yield obtained from kraft cooking (KP) and kraft dissolving pulp cooking (DP) did not have drastic differences for all the samples and therefore the results are within the same ranges (around 0.06-0.08 g/mol of black liquor). The molecular weight distribution values of KP and DP cooking are still within the range of kraft lignin Mw (1500-5000 g/mol) and the polydispersity index (PDI) of KP had a higher value than DP for both types of raw material investigated.  For the functional groups, Eucalyptus Hybrids had the higher -OH content than Acacia crassicarpa regardless of the cooking type. The 31P-NMR quantification data showed clearly that KP-Euca was the richest in Aliphatic-OH (1.4 mmol/g). DP-Euca had the greatest amount of C5-Condensed (2.5 mmol/g), while the highest amount of Guaiacyl-OH was identified in DP-Acra (1.2 mmol/g). The fingerprint of the linkages that was quantified from 2D-NMR HSQC showed that KP cooking had a higher β-O-4’, β-5’ and β-β’ interunit linkages than DP cooking. Furthermore, Acacia crassicarpa had a higher interunit linkages percentage than Eucalyptus Hybrids for both cooking methods. The highest β-O-4’, β-5’ and β-β’ linkages were detected in KP-Acra with 3.4 %, 0.5 %, and 4.3 % respectively.

Den förbättrade livsstilen hos människor har stimulerat en ökad efterfrågan på textilier, inklusive användningen av dissolvingmassa. Dissolvingmassa med hög renhet av cellulosainnehåll och unika egenskaper har varit ett attraktivt material inom textilindustrin. Eukalyptusved har i stor utsträckning använts för produktion av dissolvingmassa, särskilt i Indonesien och Brasilien. Eukalyptusved erbjuder flera fördelar såsom högt cellulosainnehåll och snabb tillväxt, vilket gör den till ett idealiskt råmaterial. I den här studien valdes två olika densiteter för eukalyptus, nämligen låg och hög flisbasdensitet, för dissolvingmassanprocessen. En fördjupad kunskap och förståelse av delignifieringsprocessen vid kokning av eukalyptus med dessa två olika densiteter kan användas för att förbättra kokningsegenskaperna, inklusive massautbyte och kvalitet.  Huvudsyftet med denna avhandlingen var att undersöka effekten av flisbasdensiteten hos eukalyptus i dissolvingmassaprocessen. Metoden för dissolvingmassaprocessen följde APRIL företagets process standard. Förhydrolystemperaturen ställdes in på 110°C till 165 °C med en ökning på 2 °C/min, neutraliseringstemperaturen ställdes in på 150 oC och den milda koktemperaturen på 155 oC, medan koncentrationen av kokkemikalien (effektiv alkali 20% och sulfiditet 30%) hölls konstant men H-faktormålen varierades. De fysiska och kemiska egenskaperna hos eukalyptus analyserades och medan den oblekta massan som producerades analyserades vidare för siktat massautbyte, lignininnehåll, pentosan, viskositet och ljusstyrka. Dessutom undersöktes fibermorfologin med SEM och ligninstrukturen undersöktes med 2D-NMR. Resultaten visar att den höga basdensiteten uppvisade överlägsna egenskaper och är en idealisk råvara vid tillverkning av dissolvingmassa. Resultaten av lägre pentosanhalt, associerad med en minskad mängd hemicellulos och en högre S/G-förhållanden, visade sig vara gynnsamma i dissolvingmassaprocessen. Vidare ledde en högre basdensitet hos träflisorna, vilket resulterar i en ökad mängd siktad massautbyte och minskad specifik vedförbrukning, vilket medför betydande positiva ekonomiska effekter och kan även minska logistikkostnaderna. Av den anledningen har eukalyptusträd av hög basdensitet en god potential för framtida utveckling och för storskaliga odlingar. / The improvement in people’s fashion lifestyle has stimulated an increase in textile demand, including the use of dissolving pulp. Dissolving pulp with high purity of cellulose content and unique properties has been an attractive material in the textile industry. Eucalyptus wood has been broadly used in dissolving pulp production, especially in Indonesia and Brazil. Eucalyptus wood offers several advantages such as high cellulose content and rapid growth that make it an ideal raw material. In this study, eucalyptus with low and high basic density, were selected in the dissolving pulp process. Better knowledge and understanding of the cooking delignification process of two different densities of eucalyptus could be used to achieve excellent cooking performance such as pulp yield and quality. The main objective of this thesis was to investigate the impact of chips basic density of eucalyptus in the dissolving pulp process. The dissolving pulp process method followed the APRIL company process standard. The prehydrolysis temperature was set at 110 oC to 165 oC with ramping 2 oC/min, neutralization temperature was set at 150 oC and the mild cooking temperature at 155 oC, while the cooking chemical concentration effective alkali 20% and sulfidity 30% were kept constant but the H-Factor targets were varied. The physical and chemical properties of eucalyptus were analyzed and the unbleached pulp produced was then analyzed for screened pulp yield, lignin content, pentosan, viscosity, and brightness. Furthermore, the fiber morphology was investigated with SEM and the lignin structure was investigated with 2D-NMR. The findings indicate that the high basic density eucalyptus wood exhibited superior behaviors and demonstrated ideal raw material in dissolving pulp production. The results of lower pentosan levels attributed to lower hemicellulose content, and higher S/G ratio were favorable in the dissolving pulp process. Moreover, the higher basic density of the wood chips resulting in higher screened pulp yield and achieved lower specific wood consumption have a huge positive economy. Additionally, it can lower the logistics cost. Hence, high basic density eucalyptus wood has good potential for future development and larger plantations.