Vpliv odprtosti površine lesnih plošč na emisijo formaldehida

Forštnarič, Jernej (author), Medved, Sergej (mentor)

Formaldehid se uporablja v večini lepil, ki se uporabljajo za izdelavo ploščnih kompozitov. Del formaldehida se veže, del pa ne reagira. Nezreagiran formaldehid počasi prehaja iz plošče. Zaradi visoke stopnje topnosti v vodi se zelo hitro absorbira v človeško telo. Lesnopredelovalna industrija se že vrsto let trudi s povečevanjem kakovosti izdelkov in s tem z zmanjševanjem emisij formaldehida iz ploščnih kompozitov. Pomemben dejavnik, povezan z emisijo formaldehida, je tudi delež odprtosti površine, skozi katero lahko formaldehid nemoteno emitira. Vpliv zaprtosti površine lesnih plošč na emisijo formaldehida smo določali na ivernih in vlaknenih ploščah, ki smo jih obložili s papirjem, impregniranim z melaminsko smolo. Uporabili smo dva različna tipa, in sicer papir s površinsko težo 130 g/m2 in 200 g/m2. Robovi plošč so bili zaprti z melaminskim ali aluminijastim trakom. Emisijo formaldehida smo določili po plinski metodi (SIST EN 717/2). Ugotovili smo, da je ključnega pomena pri zniževanju emisij prostega formaldehida iz ploščnih kompozitov obdelava površin. Z obdelavo robov in ploskev lahko namreč emisijo zmanjšamo za 90 %.

• Language: Slovenian
• Keywords: zaprtost površine
• Work type: Bachelor thesis/paper
• Typology: 2.11 - Undergraduate Thesis
• Organization: BF - Biotechnical Faculty
• Publisher: [J. Forštnarič]
• Year: 2017
• PID: 20.500.12556/RUL-91854
• UDC: 691.116
• COBISS.SI-ID: 2753161
• Publication date in RUL: 25.04.2017

Secondary language

• Language: English
• Title: Impact of exposed surface of wood based panels on formaldehyde emision

Abstract

Formaldehyde is used for most synthetic adhesives, which are used for wood based composites production. Part of formaldehyde is bonded and part remains unreacted. Unreacted formaldehyde slowly emits from board. Due to high water solubility, formaldehyde is rapidly absorbed into the human body. For many years now, the wood - processing industry has been trying to increase the quality of products and thereby to reduce emissions from wood based composites. The key factor at emission of formaldehyde is related to surface from which formaldehyde can emit into environment. Impact of exposed area on emission were measured on particle and fibre boards which were surface treated with impregnated melamine - resin paper. We used paper with surface weight 130 g/m2 and 200 g/m2 . Edges of the particleboard were closed with melamine tape and aluminium tape. The emission of free formaldehyde was measured by a gas method according to the SIST EN 717/2 standard. We came to the conclusion that surface treatment is crucial in reducing the emissions of free formaldehyde from plate composites. By processing the panels' edge and surface, the emissions can be reduced by 90 %.

• Keywords: porosity of surface