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Issue 32 (2001)

Jerzy Smardzewski
Construction optimisation of upholstered furniture: 5-19

The aim of this research project was optimisation of the supporting structure of a single-seat armchair with respect to the stability and cross section dimensions of all of its elements. The optimisation was carried out with the use of numeric method using Algor computer program. True mechanical properties of materials used and levels of normal stress caused were taken into account in the method. The new model of the supporting structure retained its stability and guaranteed optimal strength parameters.

Key words: computer, optimisation, strength, stability

Andrzej Szczepkowski
The resistance of beech wood (Fagus sylvatica L.) to fungi causing decay from trees with various degree of damage: 21-29

Studies were conducted on natural resistance of about 60 years old beech trees' wood against two fungi: Fomes fomentarius and Laetiporus sulphureus. The wood was sampled from stands of different health status, from northwestern and southeaster Poland. The trees sampled represented three degree of damage. The wood resistance against decay was determined basing on the loss of weight of wood samples after 60 and 90 days of activity of test fungi.

Key words: beech wood, wood decay, tree healthiness, natural resistance, Fomes fomentarius, Laetiporus sulphureus

Mariusz Jóźwiak, Stanisław Proszyk, Witold Jabłoński
Studies on the gelation and curing processes of melamine-urea-formaldehyde adhesive resins applied in production of wood based materials: 31-40
Paper in Polish

Studies of gelation and hardening processes of MUF resins with the viscometrical and thermal analysis methods. It was stated among others that the process of preliminary gelation described on the base of the viscometrical method in the range of temperature 50-70°C for the majority of tested glue mixtures took place accordingly to the similar mechanism, and its relation order is contained in the range 1.34-1.55.

Bartłomiej Mazela, Grzegorz Cofta
Analysis of copper and chromium in leachates from wood treated with the CCB and CB preservatives: 41-51

The objective of the study was determination of the amount of active ions included in the CCB and CB preservatives diffusing from wood to water in individual stages of leaching. Wood in the form of samples applied in testing fungicidal properties with the agar-block method were treated with tested preservatives and then leached according to the standard EN 84. Moreover, there was investigated the influence of the initial water soaking of treated wooden samples on leaching dynamics of copper and chromium ions.

Key words: leachability, CCB and CB preservatives, AAS analysis, active ions, EN 84

Mariusz Jóźwiak, Stanisław Proszyk
Investigations effects of long term hardening on the properties of melamine-urea-formaldehyde adhesive resins: 53-65
Paper in Polish

The scope of this paper was the knowledge of long term hardening of glue layer of MUF resin on structural changes with used DTA, TG and FTIR-PAS analysis, and extraction in boiling water.

It was stated among others that: most intensive decomposition took place in the range 280-380°C, the mass losses in 40-250°C is dependent upon degree of crosslinking, and independent use of relative forms assumptions of the Kissinger's and izoconversion Ozawa-Flynn-Wall methods to the kinetics description of decomposition of MUF polycondensates in the considerable way, wideness characteristics of the analysed processes.

Henryk Kasprzyk, Mariusz Jóźwiak, Stanisław Proszyk
Application of NIR spectroscopy for analysis of amino adhesive resins applied in wood based materials: 67-74

Transmission-reflection NIR spectroscopy was applied for qualitative and quantitative investigations of liquid amino (UF and MUF) adhesive resins. NIR spectra of resins were characterized with the used PLSR (partial last square regression) and MLR (multiple linear regression) methods

Key words: NIR spectroscopy, wood adhesive, MUF, UF, melanine content

Waldemar Moliński, Ewa Fabisiak
Velocity of ultrasound propagation in the beech (Fagus sylvatica L.) tension wood: 75-81

The study on ultrasonic waves velocity in tension wood and opposite wood of beech species, in three basic anatomic directions, were carried out. The experiments wave made on wood with three moisture contents, namely on green wood, wood with moisture content 7% and on oven dry wood.

Key words: beech, tension wood, opposite wood, ultrasonic waves velocity

Stanisław Spława-Neyman, Widold Pazdrowski
Effect of site fertility upon formation of heartwood in timber of Scots pine (Pinus sylvestris L.): 83-87

Sectional dendrometrical methods allow to obtain reliable results in determination of share of the heartwood and sapwood in tree stem. Appearing lately mathematical models such as “Lignum” presented in Silva Fennica are giving quite another results. In this paper presented are effects of the age and site fertility upon share of heartwood and sapwood in stems of Scots pine.

Key words: age of tree, site fertility, share of heartwood, mathematical model “Lignum”

Grzegorz Cofta, Bartłomiej Mazela
Effectiveness examination of the selected fungicides against Trichoderma viride Persoon ex S.F. Gray Aggr. on the different wooden bases: 89-96
Paper in Polish

The fungitoxic value of six different wood preservatives (tests formulation CCB type, commercial formulation CB type, Tri-n-butylin oxide, dimetyl, didecylamonium chloride, 3-iodo-2-propynylbutyl carbamate tebuconazole) against T. viride was determined in the screening test. The tested fungicides were put on five different types of the base (solid beech and pine wood, beech, birch and pine veneer). The results show that TBTO and IPBC were the most effective fungicides regardless of the base. It was stated, that biocidal activity of tested fungicides was lower in the case of veneers than in the solid wood.

Jubilee of professor Edmund Urbanik: 97-137

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