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1
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Compression strength of three layer cellular wood panels

100%
Iejavs J., Spulle U.
Drewno. Prace Naukowe. Doniesienia. Komunikaty
|
2013
|
tom 56
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nr 189
The invention of a lightweight panel with the trade mark Dendrolight is one of the most distinguished wood industry innovations in the last decade. At present, three-layer cellular wood panels have wide non-structural application. The aim of the research was to evaluate the compression properties of three-layer cellular wood panels for structural application. 8 specimens were manufactured for both perpendicular and parallel compression tests for each of 6 structural panel models. Scots pine cellular wood and solid pine wood ribs were used as the core layer of the structural panels. The cellular wood core was placed in a horizontal or vertical direction. Solid Scots pine wood panels and birch plywood as top layer material were used. The common stress type in subfloor and wall panels is compression, therefore the influences of the cellular material orientation, ribs and top layer material on the sandwich-type structural panel compression strength were evaluated according to LVS EN 408. 15 [LVS EN 408]. Extra parameters, such as the moisture content and apparent density, were determined. Different structural models have a great effect on the compression strength of cellular wood material panels. The highest compression strength in a parallel direction, 17.5 MPa, was achieved with a structural model with cellular material placed vertically, with the ribs and top layers of solid timber, but in a perpendicular direction, 4.48 MPa was achieved with a structural model with cellular material placed vertically and the top layers of plywood. Solid wood ribs significantly influence the compression strength when the panels are loaded in a parallel direction.
2
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Cellular wood material properties - review

100%
Iejavs J., Spulle U.
Drewno. Prace Naukowe. Doniesienia. Komunikaty
|
2016
|
tom 59
|
nr 198
3
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Bending properties of mechanically jointed solid timber beams

100%
Supe P., Iejavs J.
Drewno. Prace Naukowe. Doniesienia. Komunikaty
|
2017
|
tom 60
|
nr 199
4
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Reaction of door constructions made of cellular wood material to fire

81%
Spulle U., Buksans E., Iejavs J., Rozins R.
Drewno. Prace Naukowe. Doniesienia. Komunikaty
|
2016
|
tom 59
|
nr 198
5
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The comparison of properties of three-layer cellular material and wood-based panels

81%
Iejavs J., Spulle U., Jakovlevs V.
Drewno. Prace Naukowe. Doniesienia. Komunikaty
|
2011
|
tom 54
|
nr 185
In recent years a reduced weight cell panel, whose trade mark is Dendrolight, has gained worldwide recognition thanks to the opening of an experimental factory in Austria and the start-up of a new industrial factory in Latvia with manufacturing capacity of 65 thousand m3 cell board material per year. Hitherto the internal layer of cell panel of cellular wood material type has been produced mainly from softwoods like Norway spruce (Picea abies L.) or Scots pine (Pinus sylvestris L.) covered with plywood, solid wood, particleboard or other material. The reduced weight cell panel has many applications in the furniture industry, internal cladding, door production, the transport manufacturing industry, and possibly in the construction panel production. The essential goal of the research was to identify possible applications of aspen (Populus tremula L.) wood, which is a common broad-leaved tree in Latvia, as an alternative material to Norway spruce in the production of reduced weight cell panel. The aim of the initial research was to investigate some physical and mechanical properties of aspen cell panel covered with aspen and plywood as well as to compare these physical and mechanical properties with the properties of wood-based panels. The following raw materials were used: finger jointed aspen for internal layer; finger jointed aspen and three-layer birch plywood for external layer; polyurethane and polyvinylacetate adhesives for internal and external layer gluing. Tests of obtained aspen panel were carried out in accordance with current test standards for testing of panel and timber properties. The following panel parameters were determined: moisture content, density, swelling in thickness after 24-hour immersion in water, tensile strength, three-point bending strength and modulus of elasticity, and four-point bending strength. A relevant conclusion: panels of cellular wood material type produced from aspen wood have similar physical and mechanical properties to such cell panels produced from spruce wood.
6
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The properties of Lightweight Stabilised Blockboard panels

81%
Rozins R., Iejavs J., Jakovlevs V., Spulle U.
Drewno. Prace Naukowe. Doniesienia. Komunikaty
|
2020
|
tom 63
|
nr 206
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