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3. Densification of woodAndreja Kutnar, Milan Šernek, 2007, review article Abstract: The paper treats the processes involved in wood densification and provides a summary of the state-of-the-art, as presented in the literature, with regard to densification as achieved by compression, accompanied by some form of hydrothermal treatment. The viscoelastic nature of wood is discussed, togetherwith its thermal softening and typical stress-strain relationships. The properties of densified wood products depend, apart from processing parameters, on various anatomical features such as density, the percentage of late wood material, ray volume and the loading direction. The problems associated with wood stabilization after densification are also treated. Relevant examples of wood densification from fundamental research, and the results of applied studies significant for everyday practice, are presented. Aspecial focus is given on the process of viscoelastic thermal compression (VTC) of wood.
Keywords: wood, densification, softening, transverse compression, viscoelasticity, glass transition temperature
Published in DiRROS: 12.07.2017; Views: 4149; Downloads: 1896
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4. Proteinska lepila na osnovi soje, krvi in kazeina nekoč in danesDoroteja Vnučec, Milan Šernek, Andreja Kutnar, Andreja Goršek, 2017, original scientific article Abstract: V članku je podan pregled razvoja proteinskih lepil na osnovi soje, krvi in kazeina. Članek obravnava formulacije in tehnologije lepljenja teh proteinskih lepil iz obdobja 1930-1960 ter današnje komercialne formulacije. V tem obdobju so bile namreč poraba ter tehnološke izboljšave proteinskih lepil na vrhuncu. Pri obravnavi današnjih formulacij in tehnologij lepljenja je poudarek na sojinih lepilih, saj se le-ta uporabljajo v industriji lepljenja dekorativnih vezanih, ivernih in vlaknenih plošč ter parketa. Kazein se danes uporablja le še v lepilih za protipožarna vrata, medtem ko se živalska kri v lepilih ne uporablja več. Proteinska lepila iz obdobja 1930%1960 sicer ne ustrezajo zahtevam današnjih standardov in se zato več ne uporabljajo, so pa vse opisane tehnologije še vedno uporabne in se lahko ponovno uvedejo, če bodo svetovni viri nafte usahnili.
Keywords: proteinska lepila, les, soja, kri, kazein, formulacije, tehnologija lepljenja
Published in DiRROS: 03.07.2017; Views: 6303; Downloads: 3294
Full text (551,73 KB)
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