Research is the viscoelasticity properties composite of wood made by gluing beech peeled veneer and at constant load, and two constant humidity. Based on the experimental results obtained by the method of the least squares rheological parameters have been determined as well as their differences in relation depending on the moisture content of samples. Has been developed and applied numerical model based on the finite volume method analysis of viscoelasticity properties composite of wood. Starting with the continuum concept we presented and broadened the application of the finite volume method for solving of the hygro-viscoelasticity behaviour of the composite of wood. Have been ignored of anisotropy in wood, and observation of the sample as homogenous, non-layered material, and also neglect of glue. We developed the constitutive relation including the impact of moisture, expressed through relaxation functions and given in integral form. The calculation results are compared with results of the experiment

This paper presents the analysis of the infl uence of conventional hot (CH) and high frequency (HF) gluing on relevant physical and mechanical properties of Laminated Veneer Lumber (LVL) made from beech peeled veneer with the thickness of 2.1 mm. Student’s T-test was applied to determine the signifi cance of differences between mean values of results obtained for the two different treatments. A signifi cant difference has been determined for the thickness loss, density, moisture and bending strength, while no statistically signifi cant difference has been established for the modulus of elasticity and shear strength of gluing between the means of the tested samples.

Effects of the rake angle and feed rate on the surface roughness of beech (Fagus L.) were investigated on the base of the preparative differences by planing. The specimens were prepared by planing with two knives at 6, 12, 18 and 24 m/min feed rates, in 15, 20 and 25 degrees rake angles. The machining experiments were carried out using a single cutter-block of a Weinig Powermat 400. The cutter-block with a diameter of O 125 mm rotated at 6000 revolutions per minute (RPM). Surface roughness was measured from the radial face of each sample according to DIN 4768 (1990) by using Mitutoyo SJ-201 stylus scanner device. Comparison the results of the surface roughness it has been obtained that the surface roughness decreases when the feed rate decreases and the lowest surface roughness is achieved with rake angle of 20 degrees.

In this study, the surface roughness values of planed beech-wood (Fagus L.), oak-wood (Quercus L.) and fir-wood (Abies alba Mill.) specimens were examined. The samples of beech-wood were cut from steamed bech-wood and from thermally modified beech-wood (220 oC). The test specimens were cut in radial directions. The specimens were machined by planing with two knives at 6, 12, 18 and 24 m/min feed speed. The cutting depth was constant with 2, 0 mm and rake angle of knives was 15o. The machining experiments were carried out using a single cutter-block of a Weinig Powermat 400. The cutter-block with a diameter of O 125 mm rotated at 6000 revolutions per minute (RPM). Surface roughness was measured from the radial face of each sample according to DIN 4768 (1990) by using Mitutoyo SJ-201 stylus scanner device. The values obtained were statically analyzed and the results were interpreted. Comparing the results of the surface roughness of four species, it has been obtained that the surface roughness increases when the feed rate increases. The surface quality of planed beech-wood, oak-wood and fir-wood samples were significantly different. The best quality of planed surface had samples of oak-wood and the samples of fir wood had the biggest values of surface roughness. There is no significant differences of the surface quality of thermally modified and steamed beach-wood samples despite the significant difference in mechanical and physical properties of the thermally modified and steamed wood.

SUMMARY Infl uences of conventional hot (CH) and high frequency (HF) gluing on some relevant physical and mechanical characteristics, and creep at constant load and high humidity have been researched for LVL made from beach peeled veneer. Th e Standard linear and fourparameter viscoelasticity Burger model were considered. Unknown model parameters were determined according to the experimental creep results and the method of the least squares. Obtained results for diff erent gluing procedures were showed and discussed.