The Rate of Formaldehyde Emission from Chipboard

Abstract

KeywordsFormaldehyde emission Particleboard Urea-formaldehyde resin Air flow rate FacesThe Rate of Formaldehyde Emission from Chipboard Summary The rates of emission of formaldehyde from particleboard (chipboard) samples bonded with a urea-formaldehyde resin have been measured. The rates are influenced by storage relative humidity and air flow rate over the surface. The emission rate from board edges is approximately five times greater than that from the faces. A model is proposed to explain the effects of air flow rate and relative humidity on the formaldehyde emission rate. Die Geschwindigkeit der Formaldehydabgabe aus Spanplatten ZusammenfassungDie Emissionsraten von Formaldehyd aus Proben von Harnstoff-Formaldehydharz verleimten Spanplatten wurden gemessen. Die Raten hängen von der relativen Feuchtigkeit während der Lagerung und der Luftgeschwindigkeit über der Oberfläche ab. Die Emissionsraten der Schmalflächen sind ungefähr fünfmal größer als die der Oberflächen. In einem Modell wird der Einfluß der Luftgeschwindigkeit und der relativen Luftfeuchtigkeit auf die Formaldehyd-Emissionsrate dargestellt.

Review : Testing for Formaldehyde Emission from Wood-Based Products - A Review

“…The gas analysis value (mg.m-2 . h-1) depends on the gaseous resistance, density, moisture content, board thickness and airflow rate [39][40][41][42][43][44]. The test is not suitable for completely cured materials (e.g.…”

“…The calculated concentration value can deviate from the measured value, when the ratio of the air exchange rate and the area loading (n/A) of the board in a chamber is large (>8 m.h-1); an n/A ratio of between 0.4 and 2 m ~ h-1 was recommended for large chamber tests [52]. Airspeed over the surface of the material exposed in the test chamber can also have an effect on the formaldehyde emission rate from the wood-based panel [44,53,54]. COST 613 Report No.…”

Reducing resin content and board density without adversely affecting the mechanical properties of particleboard through controlling particle size

“…In addition, the formaldehyde released during production and use of wood-based composites is carcinogenic (Prasittisopin and Li 2010). This has given rise to widespread complaints about the bad odors and adverse health effects associated with formaldehyde emissions from wood-based composites (Wang et al 2007;Kazakevics and Spedding 2009).The emission of formaldehyde from particleboard decreases as the ratio of formaldehyde to urea decreases. However, this also negatively affects the physical and mechanical properties of the particleboard (Que et al 2007).…”

Testing for Formaldehyde Emission from Wood-Based Products – A Review

“…Correlation with the chamber steady-state concentration has been established [13,19,37,38]. The gas analysis value (mg W m -2 W h -1 ) depends on the gaseous resistance, density, moisture content, board thickness and airflow rate [39][40][41][42][43][44]. The test is not suitable for completely cured materials (e.g.…”

“…; an n/A ratio of between 0.4 and 2 mWh -1 was recommended for large chamber tests [52]. Airspeed over the surface of the material exposed in the test chamber can also have an effect on the formaldehyde emission rate from the wood-based panel [44,53,54]. COST 613 Report No.…”