Comparing the VOC emissions between air-dried and heat-treated Scots pine wood

Manninen, Anne‐Marja; Pasanen, Pertti; Holopainen, Jarmo K.

doi:10.1016/s1352-2310(02)00152-8

Cited by 168 publications

(128 citation statements)

References 15 publications

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“…Their absence could be due to the use of fresh sawdust, assuming that previous studies have found pentanal and hexanal formed by oxidation of biogenic fatty acids. Such oxidation is known to happen in damaged wood that is exposed to light (Arshadi and Gref, 2005;Manninen et al, 2002).…”

Section: Resultsmentioning

confidence: 99%

Volatile organic compounds emitted from hardwood drying as a function of processing parameters

Granström

Månsson

2008

Int. J. Environ. Sci. Technol.

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During the drying of wood, volatile organic compounds are emitted. These emissions contribute, in the presence of nitrogen oxides and sunlight, to the formation of ground level ozone and other harmful photo-oxidants. Emissions of volatile organic compounds from the drying of birch sawdust in a spouted bed were analyzed with a flame ionization detector and with a gas chromatograph-mass pectrometer. A D-optimal model of the emissions showed that the emissions increased exponentially with decreasing sawdust moisture content and that the final sawdust moisture content was influencing emissions about twice as much as the inlet drying medium temperature and the month of logging. At inlet temperatures of 140-170 °C, the emissions increased steeply when the moisture content of the sawdust reached 10%, whereas an inlet temperature of 200 °C caused a surge of thermal degradation products at 15% moisture content. The results of this study should help to reduce the emissions of volatile hydrocarbons during the drying of hardwood sawdust and wood chips.

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Section: Resultsmentioning

confidence: 99%

Volatile organic compounds emitted from hardwood drying as a function of processing parameters

Granström

Månsson

2008

Int. J. Environ. Sci. Technol.

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“…Cellulose content is primarily responsible for the tensile and flexural properties of wood fiber; therefore, decreasing the degree of polymerization reduces the tensile and flexural properties of wood (Sweet and Winandy 1999). Also, many extractives such as alcohols, resins, terpenes, formic acid, and acidic acid are released from the wood (Manninen et al 2002;Graf et al 2003).…”

Section: Mechanical Propertiesmentioning

confidence: 99%

Influence of Repeated Injection Molding Processing on Some Mechanical and Thermal Properties of Wood Plastic Composites

Kaymakçı¹,

Ayrılmış²

2016

BioResources

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The influence of repeated cycles of injection molding on some mechanical and thermal properties of wood plastic composites (WPCs) was investigated. Pine wood flour (50 wt%) was mixed with HDPE (50 wt%) containing compatibilizing agent (MAPE, 3 wt%) in a co-rotating twinscrew extruder. The test specimens were produced by injection molding from the pellets dried to the moisture content (MC) of 1%. After the mechanical properties of the WPC test specimens were determined, the failed specimens were subsequently pelletized. These pellets were stored and dried for 4 to 6 h until the repeated injection was molded. These processes were repeated seven times. The results revealed that the flexural strength of WPCs increased by about 5.26% from the original granules to the third injection cycle, but further increments in the number of cycles decreased the flexural strength. The tensile strength and tensile modulus of the WPC specimens increased until the third cycle of injection molding while they tended to decrease after the third injection cycle.

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“…Changes in the cellulose of wood during thermal have also been known as increase in crystallinity (Bhuiyan et al, 2000;Kubojima et al, 2001;Sivonen et al, 2002). Organic acids such as formic and acetic acid are liberated during the process which may affect the properties of wood (Risholm-Sundman et al, 1998;Garrote et al, 2001;Manninen et al, 2002). Rubio et al (1994), reported that cellulose degradation reactions started at an above 210-220°C and degree of degradation in the same way cellulose was significantly affected at temperature more than 270°C (Biermann et al, 1984).…”

Section: Cellulose Contentmentioning

confidence: 99%

Effect of Oil Heat Treatment on Chemical Constituents of Semantan Bamboo (Gigantochloa scortechinii Gamble)

Salim

Wahab

Ashaari³

2009

JSD

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Effect of oil heat treatment on chemical constituents of 3 years old Gigantochloa scortechinii Gamble bamboo was investigated. The bamboo splits within epidermis were heat-treated using crude palm oil at temperature 140°C, 180°C and 220°C for duration 30 and 60 min. After removed the epidermis, the samples were then grind to pass a BS 40-mesh sieve and retained on a BS 60-mesh sieve. The sawdust was air dried for several days before conducted to chemical analyses (cellulose, hemicellulose and lignin) based on TAPPI Standard Methods. The colorimetric method devised by Humprey and Kelly (1960) was adapted to analysis starch in bamboo. Reading was obtained through Baush Lomb UV Spectrophotometer at 650 µm calculated by standard reference using A.R. potato starch. Control was used as comparison for each type of test conducted. There was no significant different between control and condition at 140°C for 60 min (81.4%) of holocellulose content. The value was decreased by 2.1 to 10.7% (79.7 to 72.7%) after heating at 180 to 220°C for 30 to 60 min. The hemicellulose content of bamboo was ranged 24.1 to 27.8% after heating at 140-220°C for 30 to 60 min. The cellulose content of heat-treated bamboo was ranged 47.4 to 55.2% after reduced about 2 to 14%. Lignin content increased about 16% (26%) at 220°C/60 min after reduced approximately 1 to 5% at 140 to 180°C for 30 to 60 min. Starch content was largely reduced about 2 to 54% (4 to 1.9%) at 140 to 180°C for 30 to 60 min of treatment. The results indicated that degradation of cellulose and hemicellulose of heat-treated bamboo was attributed to plasticization of lignin during heating in the same time hydrolysed the starch content.

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Comparing the VOC emissions between air-dried and heat-treated Scots pine wood

Cited by 168 publications

References 15 publications

Volatile organic compounds emitted from hardwood drying as a function of processing parameters

Volatile organic compounds emitted from hardwood drying as a function of processing parameters

Influence of Repeated Injection Molding Processing on Some Mechanical and Thermal Properties of Wood Plastic Composites

Effect of Oil Heat Treatment on Chemical Constituents of Semantan Bamboo (Gigantochloa scortechinii Gamble)

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