The effects of natural compounds on reducing formaldehyde emission from plywood were investigated. Urea, catechin
and vanillin were examined as the natural formaldehyde reducers. The microemission cell, with an internal volume of
35 ml, the maximum exposed test surface area of 177 cm2 and an air purge flow rate of 50 ml min1
, was used to measure
specific emission rate (SER). In the case of no reducer treatment, formaldehyde emission from plywood was fast and SERs
were 4.4 mg m2 h1 at 30 1C and 15 mg m2 h1 at 60 1C. When this plywood was treated with the natural compounds, the
SERs of formaldehyde were decreased at all temperatures. In the case of urea treatment, the SERs of formaldehyde
decreased to 0.30 mg m2 h1 at 30 1C and 0.65 mg m2 h1 at 60 1C. When the urea treatment was applied to the inside of
kitchen cabinet (made from plywood; 270 cm wide, 60 cm deep, 250 cm high), the concentration of formaldehyde was
reduced substantially from 1600 to 130 mg m3
. The reducing effect of formaldehyde continued during the observation
period (6 months), with a mean concentration of 100 mg m3
. Reducers in the plywood would react with released
formaldehyde. Application of natural compounds such as urea, catechin and vanillin could provide a simple and effective
approach for suppressing formaldehyde emission from plywood.
r 2007 Elsevier Ltd. All rights reserved.
Keywords:
The effects of natural compounds on reducing formaldehyde emission from plywood were investigated. Urea, catechinand vanillin were examined as the natural formaldehyde reducers. The microemission cell, with an internal volume of35 ml, the maximum exposed test surface area of 177 cm2 and an air purge flow rate of 50 ml min1, was used to measurespecific emission rate (SER). In the case of no reducer treatment, formaldehyde emission from plywood was fast and SERswere 4.4 mg m2 h1 at 30 1C and 15 mg m2 h1 at 60 1C. When this plywood was treated with the natural compounds, theSERs of formaldehyde were decreased at all temperatures. In the case of urea treatment, the SERs of formaldehydedecreased to 0.30 mg m2 h1 at 30 1C and 0.65 mg m2 h1 at 60 1C. When the urea treatment was applied to the inside ofkitchen cabinet (made from plywood; 270 cm wide, 60 cm deep, 250 cm high), the concentration of formaldehyde wasreduced substantially from 1600 to 130 mg m3. The reducing effect of formaldehyde continued during the observationperiod (6 months), with a mean concentration of 100 mg m3. Reducers in the plywood would react with releasedformaldehyde. Application of natural compounds such as urea, catechin and vanillin could provide a simple and effectiveapproach for suppressing formaldehyde emission from plywood.r 2007 Elsevier Ltd. All rights reserved.Keywords:
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