The Dimensional Characteristics of the Particles of Wood Dust of Selected Deciduous Trees Considering to Explosion

2016 ◽  
Vol 688 ◽  
pp. 182-189 ◽  
Author(s):  
Eva Mračková ◽  
Ivana Tureková
Keyword(s):  
Quercus Robur ◽  
Wood Dust ◽  
Time Interval ◽  
Wood Processing ◽  
Means Of Measurement ◽  
Wood Particles ◽  
Statistical Program ◽  
Fire And Explosion ◽  
Measurement And Evaluation ◽  
Jacaranda Mimosifolia

The article is dealing with wood dust particle size problem in consideration of their fire and explosion. The aim of the thesis is statistical evaluation of wooden particles of Palisander (Jacaranda Mimosifolia) and Oak (Quercus robur L.). The samples were taken from the operation of the production furniture, in which dust is formed during the technology. Measurement was carried out by laser analyzer. Measurements were carried out on samples in specific time interval. Values, which were acquired, were evaluated of characteristics of the Weibull Distribution and treated in statistical program. It has been found by means of measurement and evaluation that sample of Palisander (Jacaranda Mimosifolia) has finer grain than sample of Oak (Quercus robur L.), therefore the has greater assumption to the creation of fire and explosions in process at the wood processing. We note in comparison with other sizes of wood particles, that the percentages are comparable.

scholarly journals COMPARATIVE CONCENTRATION MEASUREMENTS OF DUST PRODUCED BY WOOD PROCESSING MACHINES

2015 ◽  
Vol 5 (2) ◽  
Author(s):  
Aca Bozilov ◽  
Nenad Zivkovic ◽  
Dusica Pesic ◽  
Nikola Misic ◽  
Bojan Bijelic
Keyword(s):  
Key Words ◽  
Dust Emission ◽  
Maximum Allowable Concentration ◽  
Dust Concentration ◽  
Wood Dust ◽  
Wood Industry ◽  
Protective Measures ◽  
Industrial Activities ◽  
Wood Processing ◽  
Chemical Hazards

Industrial activities have to comply with protective measures. For this reason, it is essential to know the maximum allowable concentration of chemical hazards (gas, steam and dust) which can occur in the workplace. In wood industry, a large amount of wood dust is produced during the mechanical wood processing. Unless adequate measures for its removal are undertaken, there may be potential hazards for the workers’ health. The research has been carried out for purpose of determining the level of dust emission in different machines in wood processing workshops with no de-dusting system included, by measuring concentrations of wood dust produced during the processing of wooden material. Key words: wood processing, wood dust, concentration measuring

Reduction of aldehydes and terpenes within pine wood by microbial activity

Holzforschung ◽  
2016 ◽  
Vol 70 (9) ◽  
pp. 895-900 ◽  
Author(s):  
Bernhard Widhalm ◽  
Thomas Ters ◽  
Ewald Srebotnik ◽  
Cornelia Rieder-Gradinger
Keyword(s):  
Gas Chromatography ◽  
Solid Phase ◽  
Complete Removal ◽  
Growth Conditions ◽  
Raw Material ◽  
Gas Chromatography Mass Spectrometry ◽  
Bacterial Strains ◽  
Pine Wood ◽  
Wood Processing ◽  
Wood Particles

Abstract Aldehydes and terpenes are the most frequently emitted volatile organic compounds (VOCs) in the wood-processing industry. These emissions are classified as injurious to health and hazardous to the environment. To address this problem, the growth conditions have been identified under which bacteria extensively degrade both aldehydes and particularly terpenes in pine wood particles as a raw material for the production of particle boards. In this study, the focus was on pentanal and hexanal (aldehydes) as well as α- and β-pinene (terpenes). Bacterial strains were selected for their ability to metabolize α-pinene as single carbon source in liquid culture medium. α-Pinene degradation was then determined by gas chromatography (GC) analysis. Strains belonging to the genus Pseudomonas showed the best results (98% degradation after 72 h). Comparably good results were also achieved with the thermophilic strain Bacillus pallidus (90% degradation) at 55°C. Furthermore, an adapted mixed culture of Pseudomonas species was inoculated onto wood particles and incubated at room temperature for 3 days. Solid-phase microextraction (SPME) measurements of emitted volatiles and subsequent gas chromatography-mass spectrometry (GC-MS) analysis indicated a complete removal (100%) of aldehydes and, even more importantly, α- and β-pinene. Pre-treatment of unsterile pine wood particles with Pseudomonas species may have potential for industrial application.

RISK ASSESSMENT IN TEXTILE AND WOOD, PROCESSING INDUSTRY

2006 ◽  
Vol 13 (02) ◽  
pp. 115-125 ◽  
Author(s):  
KARIN REINHOLD ◽  
PIIA TINT ◽  
GUNNAR KIIVET
Keyword(s):  
Risk Assessment ◽  
Working Conditions ◽  
Textile Industry ◽  
Assessment Method ◽  
Wood Dust ◽  
Stage Model ◽  
Processing Industry ◽  
Wood Processing ◽  
Risk Assessment Method ◽  
Load Noise

The working conditions in textile and wood processing industries have been investigated using a simple risk assessment method and questionnaires worked out for the purpose. A simple/flexible risk assessment method (beginning with a two-stage model that could be enlarged into a six-stage model) is worked out by the authors (Tint & Kiivet) and the implementation possibilities are presented. It is necessary to increase interest from the side of employers for using the method and analyzing the work environment with the aim of improvement implementations. The main complaints in textile industry are high temperature in the workroom, bad ventilation, intense work and the dependence of workers' work results from the others. The main risk factors in wood processing industry are hazardous tools and equipment, also heavy physical load, noise, wood dust and odors of chemicals originating from polishes.

scholarly journals Creation of Wood Dust during Wood Processing: Size Analysis, Dust Separation, and Occupational Health

BioResources ◽  
2015 ◽  
Vol 11 (1) ◽  
Author(s):  
Eva Mračková ◽  
Ľuboš Krišťák ◽  
Martin Kučerka ◽  
Milan Gaff ◽  
Milada Gajtanska
Keyword(s):  
Occupational Health ◽  
Size Analysis ◽  
Wood Dust ◽  
Wood Processing

scholarly journals TECHNOLOGY OF PRODUCING COMPOSITE PAVERS OF CONTINUOUS ACTION

2021 ◽  
Author(s):  
Z. Sattarova ◽  
R. Safin ◽  
D. Prosvirnikov
Keyword(s):  
Wood Flour ◽  
Thermal Modification ◽  
Hydroxyl Groups ◽  
Chemical Additives ◽  
Soft Contact ◽  
Continuous Action ◽  
Wood Processing ◽  
Urgent Task ◽  
Wood Particles ◽  
High Polarity

Rational use of natural resources, and the involvement of wood waste generated in the logging and wood processing industry in the production of new products useful for society and the economy, is an urgent task of modern production. The use of wood flour of various fractions does not allow the most complete binding of the polymer to wood particles, since the cellulose polymer has a high polarity. This problem can be solved by soft contact thermal modification, as a result of which there is an increase in strength indicators and a decrease in the degree of water absorption. Thermomodification leads to a decrease in the hydroxyl groups of cellulose, which contributes to an increase in the binding with the polymer, its deeper penetration into the pores of the modified crushed wood particles. The paper presents a technology that allows to obtain composite paving stones from thermally modified flour, thermoplastic polymers with chemical additives and modifiers, continuous action.

scholarly journals Procedural Options for Measuring Muscle Strength

2016 ◽  
Vol 43 (2) ◽  
pp. 80-85
Author(s):  
S. Mindova ◽  
I. Karaganova ◽  
I. Stefanova
Keyword(s):  
Muscle Strength ◽  
Electronic Devices ◽  
Manual Muscle Testing ◽  
Strain Gauges ◽  
Digital Measurement ◽  
Mechanical Loads ◽  
Muscle Testing ◽  
Means Of Measurement ◽  
Alternative Means ◽  
Measurement And Evaluation

Summary The aim of the present study was to provide alternative means of measurement and evaluation of muscle strength in rehabilitation practice and diagnostics. In the last few years many electronic devices for evaluation of muscle strength have developed. Contemporary studies have shown that in addition to the standard manual muscle testing muscle strength can be assessed more objectively and analytically using electronic dynamometers and equipment. The strain gauges are used as a tool of precision in the industry that allows measurement of mechanical loads by dynamometers. By using these tools is possible to obtain continuous digital measurement and recording of muscle strength.

scholarly journals Waste Wood Particles from Primary Wood Processing as a Filler of Insulation PUR Foams

Materials ◽  
2021 ◽  
Vol 14 (17) ◽  
pp. 4781
Author(s):  
Radosław Mirski ◽  
Dorota Dukarska ◽  
Joanna Walkiewicz ◽  
Adam Derkowski
Keyword(s):  
Compressive Strength ◽  
Cell Structure ◽  
Microscopic Analysis ◽  
Wood Particle ◽  
Growth Direction ◽  
Polyurethane Foams ◽  
Waste Wood ◽  
Open Cell ◽  
Wood Processing ◽  
Wood Particles

A significant part of the work carried out so far in the field of production of biocomposite polyurethane foams (PUR) with the use of various types of lignocellulosic fillers mainly concerns rigid PUR foams with a closed-cell structure. In this work, the possibility of using waste wood particles (WP) from primary wood processing as a filler for PUR foams with open-cell structure was investigated. For this purpose, a wood particle fraction of 0.315–1.25 mm was added to the foam in concentrations of 0, 5, 10, 15 and 20%. The foaming course of the modified PUR foams (PUR-WP) was characterized on the basis of the duration of the process’ successive stages at the maximum foaming temperature. In order to explain the observed phenomena, a cellular structure was characterized using microscopic analysis such as SEM and light microscope. Computed tomography was also applied to determine the distribution of wood particles in PUR-WP materials. It was observed that the addition of WP to the open-cell PUR foam influences the kinetics of the foaming process of the PUR-WP composition and their morphology, density, compressive strength and thermal properties. The performed tests showed that the addition of WP at an the amount of 10% leads to the increase in the PUR foam’s compressive strength by 30% (parallel to foam’s growth direction) and reduce the thermal conductivity coefficient by 10%.

scholarly journals Correlation Between Wood Dust Levels with Interleukin-8 in Blood Serum Wood Processing Workers at X Company, Tanjung Morawa

2020 ◽  
Vol 40 (1) ◽  
pp. 33-38
Author(s):  
Jubilette Windy Hutabarat ◽  
Nuryunita Nainggolan ◽  
Amira Permatasari Tarigan ◽  
Putri Eyanoer
Keyword(s):  
Blood Serum ◽  
Serum Levels ◽  
Cross Sectional Study ◽  
The Body ◽  
Interleukin 8 ◽  
Dust Exposure ◽  
Wood Dust ◽  
Cross Sectional ◽  
Wood Processing ◽  
Spearman Correlation Test

Backgrounds: Wood dust exposure can stimulate proinflammatory cytokines and increase IL-8 levels, which is a foreign body in the body will be phagocytosis by macrophages and excrete mediators such as chemokines, cytokines, and chemoattractants which can cause inflammation. Duration of exposure, number and size of wood dust in the respiratory tract of wood industry workers are associated with various pulmonary disorders such as, COPD, occupational asthma, allergic rhinitis, decreased pulmonary function and pulmonary fibrosis. The aim this study is determine correlation between wood dust levels with interleukin-8 in blood serum among wood processing workers at x company, Tanjung Morawa-North Sumatera. Methods: A cross-sectional study which involved 40 workers from 3 different locations namely cutting, sanding and drafting. Cumulative wood dust exposure was calculated by measuring the dust content at the work site using Dusttrak TSI. IL-8 serum levels were measured using the ELISA technique. The Spearman correlation test was used. Results: Out of 40 workers those who worked in the cutting section were 15 people (37,5%), sanding section were 15 people (37,5%) and drafting section were 10 people (25%). The average level of wood dust PM 2,5 was 5,23 mg/m3while PM10 was 8,24 mg/m3 and the mean level of IL-8 in serum was 163,3 ng/L. This study find that there is a strong correlation between wood dust and IL-8 serum (r = 0,683; p

scholarly journals Pathophysiology and Diagnostic Evaluation of Occupational Asthma from Exposure to Wood Dust and Diisocyanates in the Wood Processing Employees: A Preliminary Study

2021 ◽  
Vol 9 (E) ◽  
pp. 317-323
Author(s):  
Eko Prasetyo ◽  
Anies Anies ◽  
Nyoman Suci Widyastiti ◽  
Suhartono Suhartono
Keyword(s):  
Occupational Asthma ◽  
Signs And Symptoms ◽  
Diagnostic Evaluation ◽  
Wood Dust ◽  
Wood Industry ◽  
Processing Industry ◽  
Continuous Increase ◽  
Wood Processing ◽  
Central Java ◽  
Preliminary Study

AIM: This study is a preliminary study to analyze the etiology and pathophysiology of exposure to wood dust and diisocyanates in the wood processing industry in Jepara, Central Java, Indonesia. This study also provides a diagnostic evaluation of occupational asthma (OA) for ongoing exposure. METHODS: The research method was carried out with a systematic review of various previous findings and with a preliminary study of workers in the processing industry in Jepara, Indonesia. RESULTS: The results show that from a sample of 32 respondents who have been carried out in a wood processing factory in Jepara, it shows that the suspect OA in sanding workers by hand is 75%, with the distribution of signs and symptoms: Chest tightness and pain (90%); cough (53%); shortness of breath (50%); and wheezing (2%). From the signs and symptoms felt, workers felt a continuous increase (progressivity) of OA by 75%. CONCLUSION: Theoretically, this preliminary study is useful to provide information about exposure to wood dust and diisocyanates as a risk factor for OA, especially among workers in the wood industry.

Sign in / Sign up

Export Citation Format

Share Document