Spatial distribution characteristics of the dust emitted at different cutting speeds during MDF milling by image analysis

Cui, Yunqi; Yin, Jian; Cai, Yitong; Wang, Huimin; Zhu, Nanfeng; Ding, Tao

doi:10.1186/s10086-022-02025-6

Cited by 3 publications

(2 citation statements)

References 31 publications

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“…Furthermore, absence of local exhaust ventilation (LEV), incorrect positioning of general air conditioners, use of compressed airlines and sweeping dust from furniture, clothes, work surfaces and processing tools were associated with higher dust levels. Recently, Cui et al [25] showed that higher mill cutter speeds were associated with an increase in dust levels.…”

Section: Key Pointsmentioning

confidence: 99%

“…Engineering controls Proper use of dust extraction systems is regarded as the most important technical workplace control ] demonstrated that the use of main and auxiliary sawdust extraction connectors together ensured the highest reduction in wood dust exposures to 0.5 mg/m 3 during sawing activities. Baranski et al [49] and Cui et al [25] showed that correct design of the upper suction hood for dust extraction from circular saws, and the correct positioning of dust collecting hoods can improve the efficiency of dust removal. Furthermore, optimizing cutting parameters and the location of operators in relation to these machines can contribute to reducing the spatial distribution of MDF dust levels.…”

Section: Workplace Control Measures To Reduce Exposuresmentioning

confidence: 99%

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Wood dust and asthma

Baatjies

Chamba

Jeebhay

2023

Current Opinion in Allergy &Amp; Clinical Immunology

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Purpose of the review Review recent developments on asthma associated with wood dust, given the increasing scale of wood handling and processing activities globally. Recent findingsWork in wood industries is associated with a significantly increased risk of respiratory symptoms, rhinitis and asthma. This can be attributed to traditional processing techniques and newer technologies producing complex bioaerosol exposures, which may include chemicals. Meta-analysis studies indicate strong evidence for wood dusts as occupational sensitizers for asthma, but the underlying mechanisms remain poorly understood. The global prevalence of asthma in wood workers ranges between 6--18% and for rhinitis 16--33%. Exposure estimates show wide variation. Risk factors include atopy and exposure to certain wood species, elevated current and cumulative particulate exposures. SummaryFuture studies should focus on better characterization of wood dust allergens and other bioaerosol components, specific immunoglobulin E responses to different wood species, pathophysiological mechanisms underlying asthma, and modelling dose--response relationships using refined exposure metrics for dust particulate and other bioaerosol components. There is a need for improved health-based international exposure standards and effective workplace control measures to reduce exposures to wood dust particulate (hard and soft woods), endotoxin and b-glucan, to reduce the risks of asthma in wood workers.Keywords allergy, exposure, occupational asthma, wood dust, work-related asthma METHODSA detailed literature search was conducted using PubMed, Google Scholar and Embase databases. Keywords for the search included ''wood dust, woodworkers, wood processing industry, endotoxins, b-glucans, allergens, terpenes, asthma, occupational asthma, work-related asthma, fractional

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Section: Key Pointsmentioning

confidence: 99%

Section: Workplace Control Measures To Reduce Exposuresmentioning

confidence: 99%

Wood dust and asthma

Baatjies

Chamba

Jeebhay

2023

Current Opinion in Allergy &Amp; Clinical Immunology

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Exposure Characterization of Wood Dust Particulate, Endotoxins, and (1–3)-β-d-Glucans, and Their Determinants in Mozambiquan Wood Processing Workers

Chamba

Baatjies

Singh

et al. 2023

Annals of Work Exposures and Health

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Objectives Dust generated from wood processing comprises a heterogeneous mixture of inorganic and organic particles, including wood fragments, microorganisms, endotoxins, (1–3)-β-d-glucans, and allergens. This study characterized exposure to wood dust and its determinants in the Mozambiquan wood processing industry. Methods A total of 124 personal inhalable samples, collected from a stratified random sample of 30 workers, were analysed for dust particulate, endotoxins, and (1–3)-β-d-glucans. Mixed-effects models were developed to investigate significant exposure determinants. Results The geometric mean (GM) inhalable dust particulate concentrations were 3.29 mg m−3, 98 endotoxin units (EU) m−3, and 123 ng m−3 for (1–3)-β-d-glucans. Significant predictors for higher particulate levels included machinery (GMR = 1.93), sawing (GMR = 2.80), carpentry (GMR = 2.77), or painting (GMR = 3.03) tasks. Lebombo-ironwood species was associated with higher dust particulate levels (GMR = 1.97). Determinants of endotoxin concentrations included working with dry wood and damp cleaning methods, which were associated with lower levels. Working in closed buildings (GMR = 3.10) and dry sweeping methods were associated with higher (1–3)-β-d-glucan concentrations (GMR = 1.99). Conclusions Work tasks in certain exposure groups (machinery, sawing, carpentry, painting), processing certain wood species (Lebombo-ironwood) and working in closed buildings were associated with higher exposures, whilst using dry wood and damp cleaning practices reduced exposure levels.

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Morphological Characteristics of Bamboo Panel Milling Dust Derived from Different Average Chip Thicknesses

Cui

Yin

Cai

et al. 2022

Forests

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The massive amounts of dust formed during bamboo CNC milling presents serious risks to human health and equipment. The present study aimed to determine the particle size distribution (PSD) and shape characteristics of bamboo milling dust derived from different average chip thicknesses. Spindle speed and feed rate were varied in combination, in setting up two experimental groups having the same average chip thicknesses. Sieving and flatbed scanning image analyses were collectively utilized for the morphological analysis of bamboo dust. The results showed that less than 5% of the particles were below 100 μm in terms of mass, but represented more than 83% in number. Average chip thickness was positively correlated with a mass proportion of bamboo dust with large size, which was preferably generated when reducing spindle speed instead of increasing feed rate. Spindle speed and feed rate individually affected the particle size and particle size distribution instead of average chip thickness. The aspect ratio, roundness and convexity of bamboo milling dust were augmented with a reduction in particle size, indicating that bamboo milling dust with smaller size had more a regular shape, a smoother profile and fewer corners. These findings provide a theoretical basis for better understanding bamboo milling dust and its related control in the bamboo processing industry.

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Spatial distribution characteristics of the dust emitted at different cutting speeds during MDF milling by image analysis

Cited by 3 publications

References 31 publications

Wood dust and asthma

Wood dust and asthma

Exposure Characterization of Wood Dust Particulate, Endotoxins, and (1–3)-β-d-Glucans, and Their Determinants in Mozambiquan Wood Processing Workers

Morphological Characteristics of Bamboo Panel Milling Dust Derived from Different Average Chip Thicknesses

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