Zofotokozera za Plywood - Zotulutsa

Zonse zomwe zili mu gawo lotsatirali la "Emissions" zasonkhanitsidwa kuchokera ku EWPAA: Technical Note, Formaldehyde Emissions kuchokera ku Plywood ndi Laminated Veneer Lumber.

Gawoli likunena za kuyezetsa kopitilira muyeso kwa mpweya wa formaldehyde kuchokera kuzinthu zamtundu wa EWPAA, kufotokoza mwachidule kafukufuku womalizidwa ndi EWPAA kuti mpweya wochokera kuzinthu zamtundu wa A Bonded, zomatira phenolic, zimayimira zopitilira 90% za EWPAA zomwe sizitulutsa mpweya wabwino.

Formaldehyde

Formaldehyde ndi mpweya wopanda mtundu, wonunkhiza wamphamvu womwe umapezeka mwachilengedwe m'chilengedwe ndipo umatulutsa njira monga kuvunda, kuyaka komanso mwachilengedwe ndi mitundu yonse yamitengo.

Kutulutsa kwa Formaldehyde

Plywood imapangidwa kukhala mitundu iwiri yomatira: Phenol Formaldehyde (PF) ndi pulasitiki ya amino, yomwe imaphatikizapo Melamine Urea Formaldehyde (MUF) ndi Urea Formaldehyde (UF).

Pali kusiyana kwakukulu mu chemistry pakati pa mitundu iwiri ya zomatira. Ndi zinthu zopangidwa ndi PF, pambuyo poti zotsalira zotsalira za formaldehyde zotsika pakangopita masiku ochepa, sizitulutsa formaldehyde.

Zomatira za PF, zomwe zimadziwika ndi mtundu wake wakuda, zimatchedwa Mtundu A pansi pa miyezo yaku Australia ndi New Zealand monga momwe amagwiritsidwira ntchito popanga plywood, zinthu zakunja za plywood zam'madzi (Mtundu A).

Ku Europe ndi ku United States, zinthu zomwe zimalumikizidwa ndi zomatira za PF zimayikidwa ngati zosatulutsa ndipo sizimatulutsidwa ndi malamulo otulutsa formaldehyde.

Zopangidwa ndi mapulasitiki a Amino zimakhala ndi milingo yotsalira yaulere ya formaldehyde ndipo imatha kutulutsa ma formaldehyde otsika.

Mapeto a Technical Note

Kutulutsa kwa formaldehyde kuchokera kuzinthu zovomerezeka za EWPAA ndikotsika kwambiri ndi malire ovomerezeka operekedwa ndi Workplace Australia ndipo sikukhala pachiwopsezo paumoyo.

Makalasi otulutsa mpweya wa formaldehyde mu Miyezo yaku Australia / New Zealand ndi tsatanetsatane patsamba ili pansipa. Zogulitsa zolembedwa ndi makalasi otulutsa E0 ndi E1 zimakhala ndi mpweya wochepa kwambiri wa formaldehyde.

Emission Class Formaldehyde Emission Limit (mg/l) Formaldehyde Emission Limit (ppm)*
Super E0 Ochepera kapena ofanana ndi 0.3 Ochepera kapena ofanana ndi 0.024
E0 Ochepera kapena ofanana ndi 0.5 Ochepera kapena ofanana ndi 0.04
E1 Ochepera kapena ofanana ndi 1.0 Ochepera kapena ofanana ndi 0.08