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Analýza vybraných vlastností lepených dřevěných kolíkových spojů
Linhart, Matěj
The thesis is aimed at the tensile strength of wooden dowel joint using different wood species of dowels, different types of adhesives and different material of carriers in which the dowels are glued and subsequently pulled out of them. The tensile strength of dowel joints is influenced by a several of factors which including the wood species of dowels, the type of adhesive and the material being joined. In this thesis a total of three wood species of dowels were compared (Robinia pseudoacacia L., Fagus sylvatica L., Carpinus betulus L.), two types of adhesives (PVAc adhesive Multibond SK-8 and PUR adhesive AG-PUR Standard) and two types of carrier material – insulation material Purenit and birch plywood. Both carrier materials were part of a glued spruce beam like a middle layer. A total of 12 variants of test samples were compared, which differed from each other in the wood species of dowel, adhesive type, and material of the carrier. The best results were achieved with test sample variants that contained birch plywood as a carrier and were glued with PUR adhesive AG-PUR Standard.
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Vplyv extrémneho umyvacieho procesu na pevnosť v ohybe lepeného spoja v listnatom dreve
Tuhý, Dušan
The diploma thesis is focused on the issue of the effect of the washing process on the bending strength of the glued joint in a special solid wood panel made of hardwood. The goal was to analyze currently available adhesives and types of joints in solid wood panels and to deal with the issue of the washing process and its influence. The selected glue was PVAc glue Rakoll ® GXL 4 and a butt joint, and then the changes in bending strength were compared on wood samples from beech, oak, ash and maple after thirty cycles of an intensive washing process using cleaning tablets and subsequent acclimatization of the samples. These were compared with samples that did not undergo the cleaning process.
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Analýza metod posouzení pevnosti lepených materiálů z masivního dřeva
Pipíška, Tomáš
This study aims to compare the strength of bonding joint and bonding quality depending on the proportion of violations. The first part contains a research of various types of adhesives. Based on the research, two types of adhesive were chosen - the PVAC and UF adhesives. These adhesives are used directly in manufacturing of solid wood panels. Our test samples were made of beech wood and oak wood using both types of adhesive, four groups of samples altogether. The thesis contains an analysis of the requirements for bonding strength as well as production of samples from solid wood panel. According to current standards, the tests were performed to determine the density, moisture content, strength of bonding joint, the bonding quality and proportion of violations.
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Vliv klimatických podmínek na pevnost lepených spojů MDF
Boštík, Vít
This bachelor thesis deals with the influence of the climatic conditions on bonding strength of MDF. Three types of bonded joints were used for testing – MDF-MDF, MDF-oak and MDF-artificial stone. The specimens were glued together with two component polyvinyl acetate adhesive. One half of testing joints was exposed to higher temperature and humidity, the second half of testing joints was exposed to normal conditions. After conditioning the specimens were subjected shear tension test. Then it was compared strength of bonded joints between normal conditions and higher temperature and humidity conditions.
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Vliv složení směsi UF lepidla a disperzního PVAc lepidla na pevnost lepeného spoje
Haškovec, Ivo
The thesis deals with the influence of mixture of the mixed adhesive and dispersion PVAc adhesive for bonding strength in shear strength. For the testing were selected two economically very important wood species (the spruce and beech wood) which are used in construction, furniture and building industry. All samples were grouped by the type of adhesive and by the temperature used for 28 days conditioning. All samples were bonded with coating 120 g/m2. After bonding, pressing and conditioning to required temperature were all samples subjected to a test, which examines the bonding strength in shear. The thesis deals with the comparison of the results and examines the effect of the adhesive mixture to bonding strength.
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