Lonke ulwazi olungaphakathi kwesigaba esilandelayo esithi “Okukhishelwayo” luqoqwa ku-EWPAA: Inothi Lobuchwepheshe, Ukukhishwa kwe-Formaldehyde okuvela ku-Plywood kanye Nezingodo Ze-Laminated Veneer.
Lesi sigaba sibhekisela ekuhlolweni okuqhubekayo kwemboni okubanzi kokukhishwa kwe-formaldehyde okuvela emikhiqizweni enophawu lwe-EWPAA, kufinyezwa inhlolovo egcwaliswe yi-EWPAA yokuthi ukukhishwa kwemikhiqizo ye-Type A Bonded, enama-phenolic adhesive, kumelela ngaphezu kuka-90% wokukhiqizwa kwe-EWPAA okungakhiqizi nhlobo.
I-formaldehyde
I-Formaldehyde igesi engenambala, enephunga elinamandla eyenzeka ngokwemvelo endaweni ezungezile futhi ikhishwa izinqubo ezifana nokubola, ukusha kanye ngokwemvelo yizo zonke izinhlobo zamapulangwe.
Ukukhishwa kwe-formaldehyde
I-Plywood yakhiwe yaba izinhlobo ezimbili zokunamathela eziyisisekelo: i-Phenol Formaldehyde (PF) kanye nepulasitiki ye-amino, ehlanganisa i-Melamine Urea Formaldehyde (MUF) ne-Urea Formaldehyde (UF).
Kunomehluko omkhulu kukhemistri phakathi kwezinhlobo ezimbili zokunamathisela. Ngemikhiqizo eboshelwe yi-PF, ngemva kokuba noma iyiphi i-formaldehyde esele yezinga eliphansi evela ohlelweni lokukhiqiza isinyamalele phakathi nezinsuku ezimbalwa, ayikhiphi i-formaldehyde.
Ingcina ye-PF, ekhonjwa ngombala wayo omnyama, ibizwa ngokuthi Uhlobo A ngaphansi kwamazinga e-plywood ase-Australia naseNew Zealand njengoba isetshenziswa ekwenzeni i-plywood yesakhiwo, imikhiqizo ye-marine plywood yangaphandle (Uhlobo A).
EYurophu nase-United States, imikhiqizo ehlanganiswe ne-PF enamathelayo ihlukaniswa njengengakhiphi futhi ikhululiwe emithethweni yokukhipha i-formaldehyde.
Imikhiqizo eboshelwe epulasitiki yama-amino ivamise ukuba namazinga aphezulu ayinsalela amahhala e-formaldehyde futhi ingakhipha amazinga aphansi e-formaldehyde.
Isiphetho Sesaziso Sobuchwepheshe
Ukukhishwa kwe-formaldehyde okuvela emikhiqizweni eqinisekisiwe ye-EWPAA kungaphansi kakhulu kwemingcele yokuchayeka eyamukelekayo eshiwo Indawo Yokusebenzela yase-Australia futhi ayiyona ingozi yezempilo.
Amakilasi okukhishwa kwe-formaldehyde Emazingeni ase-Australia/New Zealand ayimininingwane kuleli thebula elingezansi. Imikhiqizo enelebulwe ngamakilasi e-emission E0 kanye ne-E1 inokukhishwa kwe-formaldehyde okuphansi kakhulu.
I-Emission Class Umkhawulo Wokuphuma Kwe-Formaldehyde (mg/l) I-Formaldehyde Emission Limit (ppm)*
I-Super E0 Ngaphansi noma ilingana no-0.3 Ngaphansi noma kulingana no-0.024
E0 Ngaphansi noma kulingana no-0.5 Ngaphansi noma kulingana no-0.04
E1 Ngaphansi noma kulingana no-1.0 Ngaphansi noma kulingana no-0.08
Isikhathi sokuthumela: Oct-19-2021