|Document ID (ISN)||36136|
|Convention or series no.
||Niemelä R., Riipinen H., Aatola S., Kähkönen E., Mäkelä P., Vähä-Söyrinki A.
||Ventilation in particle board and plywood plants
||Ilmanvaihto lastulevy- ja vaneritehtaissa [in Finnish]|
||Työterveyslaitos, Laajaniityntie 1, 01620 Vantaa 62, Finland, 1980. 75p. Illus. 21 ref. Price: Fmk.20.00.
||Study to determine possibilities of reducing airborne formaldehyde (F) by different ventilation systems in 3 particle board plants (PBP), 2 plywood plants and one coating plant. Ventilation was analysed by mapping airflow patterns and measuring ventilation rate, F concentrations and thermal climate. Tracer technique was used to investigate the spreading routes of F. PBP had higher F concentrations than the plywood and cotaing plants, in spite of more forced ventilation. Significant differences in airflow (general ventilation, exhaust hoods) were observed in 3 PBP. At a ventilation rate of 20h-1, F concentration was below 1cm3/m3, it was 2x higher in PBP having an air exchange rate of <10h-1. Recirculation of exhaust air was common in PBP. F concentrations could be lowered by more efficient enclosure and local exhaust ventilation. The amount of free F in urea-formaldehyde resins (UFR) used in the PBP has a significant influence on F concentrations. Release of F from phenol-formaldehyde resins was smaller than that from UFR.
||formaldehyde; urea-formaldehyde resins; woodworking industry; ventilation; adhesives
||distribution of air pollutants; plywood; local exhaust; Finland; airflow measurement; varnishes; enclosure; exhaust ventilation; occupational health survey; urea
||E - Books, reports, proceedings
||Heating, ventilation and climate
|Broad subject area(s)
Lumber and the woodworking industry