Influences of hot pressing temperature and surface structure on VOC emissions from OSB made of Scots pine

Holzforschung ◽  
2006 ◽  
Vol 60 (5) ◽  
pp. 533-538 ◽  
Author(s):  
Mathias Makowski ◽  
Martin Ohlmeyer
Keyword(s):  
Surface Structure ◽  
Scots Pine ◽  
Hot Pressing ◽  
Fine Particles ◽  
Oriented Strand Board ◽  
Pressing Temperature ◽  
Voc Emissions ◽  
Emission Testing ◽  
Volatile Organic ◽  
Manufacturing Parameters

Abstract Oriented strand board (OSB) made of Scots pine (Pinus sylvestris L.) releases high amounts of terpenes and aldehydes. These volatile organic compound (VOC) emissions are clearly affected by the manufacturing parameters. As a consequence of high temperatures during hot pressing, terpene emissions from OSB are reduced. Aldehyde emissions are initially lowered after pressing at a high temperature (260°C). Furthermore, emissions are influenced by the surface structure. If the surface consists of fine particles, terpene emissions are lowered and the course of aldehyde formation is altered. Nevertheless, a reduction in VOC emissions by adjustment of the parameters investigated in this work seems to be restricted to terpenes. Aldehyde emissions from all panels converge during emission testing and in the final stages no clear distinction is possible according to the pressing temperature or surface structure.

Impact of drying temperature and pressing time factor on VOC emissions from OSB made of Scots pine

Holzforschung ◽  
2006 ◽  
Vol 60 (4) ◽  
pp. 417-422 ◽  
Author(s):  
Mathias Makowski ◽  
Martin Ohlmeyer
Keyword(s):  
Scots Pine ◽  
Process Parameters ◽  
Elevated Temperatures ◽  
Oriented Strand Board ◽  
Time Factors ◽  
Drying Temperature ◽  
Voc Emissions ◽  
Pressing Time ◽  
Emission Testing ◽  
Volatile Aldehydes

Abstract Correlations between process parameters and VOC emissions from an oriented strand board (OSB) made of Scots pine (Pinus sylvestris L.) were demonstrated. Terpene and aldehyde emissions were affected by the pressing time factors in different ways: terpene emissions were lowered with elevated pressing times, whereas the formation of volatile aldehydes was accelerated. Drying temperature mainly affected the dynamics of aldehyde formation, with a clear rise and fall in aldehyde concentration after drying at elevated temperatures (170°C and >200°C). As a consequence of lower temperatures (120°C), aldehyde emissions from OSB constantly increased over the testing period. In spite of this context, a sustainable reduction in aldehyde emissions by adjusting the relevant process parameters does not seem to be feasible, as the concentrations released from all panels converged during emission testing.

Long-term development of VOC emissions from OSB after hot-pressing

Holzforschung ◽  
2005 ◽  
Vol 59 (5) ◽  
pp. 519-523 ◽  
Author(s):  
Mathias Makowski ◽  
Martin Ohlmeyer ◽  
Dietrich Meier
Keyword(s):  
Hot Pressing ◽  
Unsaturated Fatty Acids ◽  
Oriented Strand Board ◽  
Wood Properties ◽  
Storage Conditions ◽  
Test Results ◽  
Voc Emissions ◽  
Volatile Organic ◽  
And Storage

Abstract An oriented strand board (OSB) made of Scots pine (Pinus sylvestris L.) was tested for volatile organic compound (VOC) emissions 24 h after the hot-pressing process over a period of 2 months. The predominant emissions from the OSB were monoterpenes and aldehydes. Terpene emissions decreased continuously, whereas aldehyde concentrations initially increased and subsequently decayed. Aldehydes are formed by the autoxidative splitting of unsaturated fatty acids contained in the wood. Due to the delayed release of aldehydes, a comparison of different emission test results is only possible if age and storage conditions are clearly specified. For a reduction in VOC emissions from wood-based materials, wood properties, manufacturing process, and storage conditions have to be considered.

scholarly journals High- and low-temperature pyrolysis profiles describe volatile organic compound emissions from western US wildfire fuels

2018 ◽  
Author(s):  
Kanako Sekimoto ◽  
Abigail R. Koss ◽  
Jessica B. Gilman ◽  
Vanessa Selimovic ◽  
Matthew M. Coggon ◽  
...  
Keyword(s):  
High Temperature ◽  
Low Temperature ◽  
Biomass Burning ◽  
Ponderosa Pine ◽  
Fine Particles ◽  
Voc Emissions ◽  
Western Us ◽  
Volatile Organic ◽  
Low Temperature Pyrolysis ◽  
Pyrolysis Processes

Abstract. Biomass burning is a large source of volatile organic compounds (VOCs) and many other trace species to the atmosphere, which can act as precursors to the formation of secondary pollutants such as ozone and fine particles. Measurements collected with a proton-transfer-reaction time-of-flight mass spectrometer during the FIREX 2016 laboratory intensive were analyzed with Positive Matrix Factorization (PMF), in order to understand the instantaneous variability in VOC emissions from biomass burning, and to simplify the description of these types of emissions. Despite the complexity and variability of emissions, we found that a solution including just two emission profiles, which are mass spectral representations of the relative abundances of emitted VOCs, explained on average 85 % of the VOC emissions across various fuels representative of the western US (including various coniferous and chaparral fuels). In addition, the profiles were remarkably similar across almost all of the fuel types tested. For example, the correlation coefficient r of each profile between Ponderosa pine (coniferous tree) and Manzanita (chaparral) is higher than 0.9. We identified the two VOC profiles as resulting from high-temperature and low-temperature pyrolysis processes known to form VOCs in biomass burning. High-temperature and low-temperature pyrolysis processes do not correspond exactly to the commonly used flaming and smoldering categories as described by modified combustion efficiency (MCE). The average atmospheric properties (e.g. OH reactivity, volatility, etc.) of the high- and low-temperature profiles are significantly different. We also found that the two VOC profiles can describe previously reported VOC data for laboratory and field burns. This indicates that the high- and low-temperature pyrolysis profiles could be widely useful to model VOC emissions from many types of biomass burning in the western US, with a few exceptions such as burns of duff and rotten wood.

scholarly journals The Performance Optimization of Oriented Strand Board Veneer Technology

Coatings ◽  
2020 ◽  
Vol 10 (6) ◽  
pp. 511 ◽  
Author(s):  
Xianqing Xiong ◽  
Qingru Ma ◽  
Jie Ren
Keyword(s):  
Performance Optimization ◽  
Hot Pressing ◽  
Bonding Strength ◽  
Oriented Strand Board ◽  
Penetration Rate ◽  
Pressing Temperature ◽  
Processing Technologies ◽  
Pressing Time ◽  
Surface Bonding ◽  
Unit Pressure

Oriented strand board (OSB) veneer technology and its performance have been widely studied in order to expand the range of OSB substrates. In this paper, OSB was a modified composite with boards as substrates, Myanmar old mahogany bark as the veneer material, and a cornstarch adhesive. Under such conditions, the optimal veneer technology was studied, and the index of the surface bonding strength and the veneer penetration rate were utilized in order to determine the performance. Two different processing technologies, cold pressing and hot pressing, were experimentally compared and hot pressing showed better performance. Subsequently, experiments were performed on the surface bonding strength and veneer penetration rate. The results show that the veneer performance of OSB is best when the unit pressure is 1.0 MPa, the hot-pressing temperature is 90 °C, and the hot-pressing time is 240 s. Furthermore, the magnitude of influence of the factors affecting the bonding strength is as follows: unit pressure > hot-pressing temperature > hot-pressing time. The research results have prospective significance for the performance optimization of OSB veneer technology.

scholarly journals High- and low-temperature pyrolysis profiles describe volatile organic compound emissions from western US wildfire fuels

2018 ◽  
Vol 18 (13) ◽  
pp. 9263-9281 ◽  
Author(s):  
Kanako Sekimoto ◽  
Abigail R. Koss ◽  
Jessica B. Gilman ◽  
Vanessa Selimovic ◽  
Matthew M. Coggon ◽  
...  
Keyword(s):  
Low Temperature ◽  
Biomass Burning ◽  
Ponderosa Pine ◽  
Fine Particles ◽  
Proton Transfer Reaction ◽  
Voc Emissions ◽  
Western Us ◽  
Volatile Organic ◽  
Low Temperature Pyrolysis ◽  
Pyrolysis Processes

Abstract. Biomass burning is a large source of volatile organic compounds (VOCs) and many other trace species to the atmosphere, which can act as precursors to secondary pollutants such as ozone and fine particles. Measurements performed with a proton-transfer-reaction time-of-flight mass spectrometer during the FIREX 2016 laboratory intensive were analyzed with positive matrix factorization (PMF), in order to understand the instantaneous variability in VOC emissions from biomass burning, and to simplify the description of these types of emissions. Despite the complexity and variability of emissions, we found that a solution including just two emission profiles, which are mass spectral representations of the relative abundances of emitted VOCs, explained on average 85 % of the VOC emissions across various fuels representative of the western US (including various coniferous and chaparral fuels). In addition, the profiles were remarkably similar across almost all of the fuel types tested. For example, the correlation coefficient r2 of each profile between ponderosa pine (coniferous tree) and manzanita (chaparral) is higher than 0.84. The compositional differences between the two VOC profiles appear to be related to differences in pyrolysis processes of fuel biopolymers at high and low temperatures. These pyrolysis processes are thought to be the main source of VOC emissions. “High-temperature” and “low-temperature” pyrolysis processes do not correspond exactly to the commonly used “flaming” and “smoldering” categories as described by modified combustion efficiency (MCE). The average atmospheric properties (e.g., OH reactivity, volatility, etc) of the high- and low-temperature profiles are significantly different. We also found that the two VOC profiles can describe previously reported VOC data for laboratory and field burns.

Study on the Volatile Organic Compounds (VOC) Emission of Wood Composites

2010 ◽  
Vol 113-116 ◽  
pp. 474-478 ◽  
Author(s):  
Wen Chao Zhang ◽  
Jun Shen ◽  
Feng Chen
Keyword(s):  
Organic Compounds ◽  
Hot Pressing ◽  
High Flow ◽  
Resin Content ◽  
Wood Composites ◽  
Particle Board ◽  
Pressing Temperature ◽  
Volatile Organic ◽  
Rapid Dissemination ◽  
Environment Chamber

In this paper, TVOC emission of veneered wood-based panel and coating processing was systematically discussed. The results showed that resin content and hot-pressing temperature of veneered wood-based particle board had obvious impact on TVOC releasing. When velocity of flow was 0.02 m/s, after 10 hours experiment, TVOC concentration in the environment chamber was 263μg/m3. While velocity of flow 0.04m/s, TVOC concentration was 29 μg/m3. High-flow velocity was helpful for rapid dissemination of TVOC. The research also found after 10 hours experiment, concentration of TVOC in environment chamber is 31μg/m3, 220μg/m3 and 400μg/m3 corresponding amount of paint was 20g, 40g and 60g. The thicker the layer was, the longer the time of layer dehumidification and TVOC diffusion needed.

Optimization of Processing Parameters for Low VOC Emissions of Wood-Based Panels

2011 ◽  
Vol 148-149 ◽  
pp. 130-133 ◽  
Author(s):  
Yu Liu ◽  
Jun Shen ◽  
Xiao Dong Zhu
Keyword(s):  
Hot Pressing ◽  
Raw Materials ◽  
Orthogonal Design ◽  
Processing Parameters ◽  
National Standard ◽  
Pressing Temperature ◽  
Board Density ◽  
Volatile Organic ◽  
Press Time ◽  
Temperature Time

The influence of hot-pressing parameters on formaldehyde and other volatile organic compounds (VOC) were studied in this paper. The particleboard of larix gmelinii and UF resin were used as main raw materials. Orthogonal design was adopted to analyze the influence of hot-pressing temperature, time, resin and density on the concentration of formaldehyde and other VOC. The results showed that the emission of formaldehyde and other VOC were significantly affected by hot-pressing temperature, time, resin and density. The emission of formaldehyde and other VOC were obviously decreased in usage with the increasing of hot-pressing temperature, press time and the decreasing of density. Taking formaldehyde and other VOC emission into account, the optimized condition was hot-pressing temperature of 180°C, press time of 5 min, resin content of 11%, board density of 0.6g/cm3. The emissions of optimized particleboard satisfied the national standard GB18580-2001.

Volatile organic compounds (VOCs) from lauan (Shorea ssp.) plyboard prepared with kraft lignin, soy flour, gluten meal and tannin: emissions during hot pressing and from panels as a function of time

Holzforschung ◽  
2019 ◽  
Vol 73 (3) ◽  
pp. 305-311 ◽  
Author(s):  
Warren Grigsby ◽  
Shin-ichiro Tohmura ◽  
Kohta Miyamoto
Keyword(s):  
Hot Pressing ◽  
High Performance ◽  
Condensed Tannin ◽  
Kraft Lignin ◽  
Soy Flour ◽  
Voc Emissions ◽  
Relative Contribution ◽  
The Press ◽  
Corn Gluten ◽  
Volatile Organic

Abstract Soy and corn gluten proteins are common ingredients in adhesives and resins together with kraft lignin and condensed tannin. The relative contribution of these additives to volatile organic compound (VOC) emissions in the course of processing hardwood veneer products was evaluated. Press emissions were captured and separated into condensate and gaseous fractions. High-performance liquid chromatography (HPLC) was employed to characterize aldehydes in condensate and gaseous fractions, while GCMS served for identification and quantitative determination of the compounds in the gas phase. Aldehydes dominate the press emissions with both proteinaceous binders producing significantly higher formaldehyde (FA), acetaldehyde (AcA) and hexaldehyde (hexA) emissions compared to pressed veneer without additives. Other aldehydes, including valeraldehyde and propionaldehyde were also captured, but in relatively lower amounts. In contrast, lignin as a binder led to lower FA content in press emissions, whereas tannin significantly reduced contributions of FA, AcA and other aldehydes. VOC emissions from plywood panels during chamber testing were similar to compounds evolved on hot-pressing.

scholarly journals Species and characteristics of volatile organic compounds emitted from an auto-repair painting workshop

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
M. Y. Song ◽  
H. Chun
Keyword(s):  
Volatile Organic Compounds ◽  
Organic Compounds ◽  
Large Scale ◽  
Butyl Acetate ◽  
Small Scale ◽  
Indoor Environments ◽  
Voc Emissions ◽  
Volatile Organic ◽  
Before And After ◽  
Adsorption Systems

AbstractVolatile organic compounds (VOCs) are secondary pollutant precursors having adverse impacts on the environment and human health. Although VOC emissions, their sources, and impacts have been investigated, the focus has been on large-scale industrial sources or indoor environments; studies on relatively small-scale enterprises (e.g., auto-repair workshops) are lacking. Here, we performed field VOC measurements for an auto-repair painting facility in Korea and analyzed the characteristics of VOCs emitted from the main painting workshop (top coat). The total VOC concentration was 5069–8058 ppb, and 24–35 species were detected. The VOCs were mainly identified as butyl acetate, toluene, ethylbenzene, and xylene compounds. VOC characteristics differed depending on the paint type. Butyl acetate had the highest concentration in both water- and oil-based paints; however, its concentration and proportion were higher in the former (3256 ppb, 65.5%) than in the latter (2449 ppb, 31.1%). Comparing VOC concentration before and after passing through adsorption systems, concentrations of most VOCs were lower at the outlets than the inlets of the adsorption systems, but were found to be high at the outlets in some workshops. These results provide a theoretical basis for developing effective VOC control systems and managing VOC emissions from auto-repair painting workshops.

Effects of manufacturing parameters on properties of rubberwood-cross laminated timber manufactured via hot pressing

2021 ◽  
pp. 102703
Author(s):  
Suthon Srivaro ◽  
Satjapan Leelatanon ◽  
Monthian Setkit ◽  
Nirundorn Matan ◽  
Sureurg Khongtong ◽  
...  
Keyword(s):  
Hot Pressing ◽  
Cross Laminated Timber ◽  
Manufacturing Parameters
Sign in / Sign up

Export Citation Format

Share Document