| 1. |
- Adamopoulos, Stergios, et al.
(författare)
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Effect of laser drilling on mechanical properties of fir (Abies borisii regis) and spruce (Picea excelsa) wood
- 2014
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Ingår i: Wood Structure, Properties and Quality – 2014. - : Moscow State University Press. - 9785813506253 ; , s. 7-12
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Konferensbidrag (refereegranskat)abstract
- Fir and spruce wood specimens, 2×2 cm in cross section and 34 cm long, were pre-pared with true radial and tangential surfaces. All lateral surfaces of the wood specimens were drilled by laser beams to a depth of 0,4 cm (1/5 of specimen thickness) with two drilling pat-terns (distance between holes 1 × 1 cm and 1 × 2 cm). After drilling, static bending (MOR, MOE), axial compression strength and toughness were determined and compared with non-drilled control specimens. The effects of the two laser drilling patterns on mechanical proper-ties of fir and spruce wood specimens were measured and assessed. The results showed that the two drilling patterns created by laser beams on all lateral surfaces of fir and spruce wood specimens at 0,4 mm depth did not practically affect the mechanical properties of wood.
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| 2. |
- Karastergiou, Sotirios, et al.
(författare)
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Impregnation of fir (Abies borisii regis) and spruce (Picea excelsa) wood with rape oil and CCB preservative
- 2014
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Ingår i: Wood Structure, Properties and Quality – 2014. - : Moscow State University Press. - 9785813506253 ; , s. 77-82
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Konferensbidrag (refereegranskat)abstract
- The objective of this study was to examine the retention (kg/m³) and the penetration depth (mm) as well as the impregnated area of cross sections (%) along the hole length, in fir (Abies borisii regis) and spruce (Picea excelsa) wood, after preservative treatment with rape oil and CCB preservative (3,2 %). The wood specimens (5×5 cm or 10×10cm in cross section and 40 cm long) with true radial and tangential surfaces, were treated with the full cell pro-cess. In order to determine the effect of direction (axial, lateral/radial or tangential) on pene-tration of rape oil and CCB preservative, the surfaces of the specimens were coated (laterally in all surfaces and in cross sections, respectively). Retention of rape oil ranged between 21,06 and 78,51 kg/m3 in fir specimens and between 11,20 and 90,32 kg/m3 in spruce specimens, while retention of CCB preservatives fluctuated between 1,68 and 10,05 kg/m3 in fir and be-tween 1,86 and 6,80 kg/m3 in spruce specimens. Penetration depth in all directions as well as impregnated area of cross sections of wood specimens were found to be lower in spruce than in fir for rape oil and, in most cases, for CCB preservative tested. The general conclusion is that both species are difficult to impregnation, but fir is more permeable than spruce.
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| 3. |
- Voulgaridis, Elias, et al.
(författare)
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Effect of laser drilling on impregnability of fir (Abies borisii regis) and spruce (Picea excelsa) wood
- 2014
-
Ingår i: Wood Structure, Properties and Quality – 2014. - : Moscow State University Press. - 9785813506253 ; , s. 51-56
-
Konferensbidrag (refereegranskat)abstract
- Fir and spruce wood specimens, 2×2 cm in cross section and 34 cm long, were pre-pared with true radial and tangential surfaces. All lateral surfaces of the wood specimens were drilled by laser beams to a depth of 0,4 cm (1/5 of specimen thickness) with two drilling patterns (distance between holes 1×1 cm and 1×2 cm) in order to improve the wood permea-bility of these refractory to impregnation species. After drilling and assessing the drilling ef-fect on mechanical properties of wood, wood specimens, 10 cm long, were impregnated with oil and CCB preservatives by using vacuum (0,6 mmHg) and pressure (1,5 bar) for 15 minutes and 30 minutes, respectively. The effects of the two laser drilling patterns on impreg-nability of fir and spruce wood specimens were measured and assessed. The results showed that both drilling patterns created by laser beams on all lateral surfaces of fir and spruce wood specimens at 0,4 mm depth improved the retention and penetration of preservatives in fir and spruce wood specimens. This effect was more pronounced in fir than in spruce. Between the two drilling patterns, the pattern with distances between holes 1×1 cm was more effective than that with distances 1×2 cm, in both species tested.
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