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Vliv teploty lepidla a povrchu adherendu na hloubku penetrace lepidla do masivního dřeva
Voldřichová, Anna
The final thesis deals with the influence of different gluing conditions on the depth of penetration of the adhesive into the surface of solid wood, specifically of the influence of increased pressure during pressing. Furthermore, the thesis investigates the effect of penetration on the strength of the glued joint under tensile loading. Specimens of spruce and oak wood were glued with UF glue and PVAC glue, pressed under different compression pressures and then subjected to tensile test. SEM analysis on an electron microscope was used to evaluate the depth of penetration. The results of the investigation of the effect of ink on the strength of the bonded joint and the penetration depth of the adhesive into the material are also included. The ink was used in the adhesive mixtures for the purpose of colouring the bonded joint.
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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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Pevnost lepených spojů obkladových panelů břízová překližka sklo
Matějovská, Lucie
The diploma thesis deals with gluing selected types of wooden materials (birch and beech plywood) with glass and two types of adhesives (Sikasil SG-20 and Soudal PU Construct). The strength of bondes splices was measured by tensile and bending test in an Instron 3365 tensile test machine. The theoretical part focused introduction of basicofbonding technology. The practical part focused made of bonding splicesand evaluation of results from tensile and bending test.
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Vliv extrémního mycího procesu na pevnost ve smyku lepeného spoje v listnatém dřevě.
Aksenov, Artemii
This masters’ thesis solves the problem of an effect of increased temperature and moisture on the strength of bonded joints in a special battenboard exposed to washing in standard household washing machines. Test samples were made of beech, locust, ash, walnut, and oak, bonded with PVAc D4 adhesive on a butt joint. After exposure to 30 washing cycles, the shear strength of the bonded joint was tested along the direction of fiber growth and compared to reference samples. The theoretical part includes a literature review and methodology, while the practical part presents the determined values and statistical evaluation.
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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 teploty a extrémní vlhkosti na pevnost lepeného spoje u spárovky z listnatého dřeva, určené pro výrobu kuchyňských prvků omyvatelných v myčce na nádobí
Vacek, Jiří
This diploma thesis solves the problem of a suitable combination of used adhesive and the shape of a glued joint, to produce a battenboard usable in the production of kitchen products washable in dishwasher. The tested samples were made of beech and oak and their edges were machined into glued joints of the wedge calk, the blunt joint and the double wedge pen. For testing were used two polyvinyl acetate adhesives and one polyurethane adhesive with different types of moisture resistance. The resistance of the samples to bending stresses on the glued joint was tested before exposure to the washing process and after the completion of thirty washing cycles. The theoretical part includes a literary overview and methodology dealing with the given issue, the practical part describes the achieved results.
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Posouzení kvality lepení kombinovaných masivních materiálů na bázi dřeva
Ženatý, Petr
The idea of this work came from doc. Dr. Ing Pavel Král when some company contant him regarding research for using appropriate materials and adhesives for window frames. The goal of my work is to determine the bonding strength of various combinations of wood (oak, beech, larch, spruce, poplar and accoya) and polyurethane adhesives. The research was half focused on today less known tree species Accoya wood and its behavior in combination with other tree species. It is a modified type of wood (pine Radiata Pine), who thanks to a chemical process called acetylation becomes a high quality, durable and durable material. The practical part is a tensile stress test specimen to shear with various types of adhesives. My job was to find the right combination of wood and glue, that will have sufficient strength and concurrently resist external conditions (humidity, wind, solar radiation).
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The influence of compression on bonding strength of glued joint
Trinklová, Karolína ; Bomba, Jan (advisor)
Thesis is dealing with PVAC dispersion adhesives. Main objective of this thesis is to assess the influence of compression pressure on strenght of glued joint. For research were used two kinds of adhesives. Secondary task was also determine if one of used glues suits to normatively appointed denominations of classe of durability D3. Speciments were made according to norms ČSN EN 204 a ČSN EN 205, than they were gummed by selected glues using different compression pressures and exposed to appointed conditions, which corresponds to classes of durability D1, D2 and D3. Finally there were determined strenght of glued joints according to the same norms and evaluated the influence of compression pressure. Results from all measurments were registred per tables and graphs.
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Research of influence of degradation process on changes of mechanical properties of polymeric particle composites
Škoda, Marek ; Müller, Miroslav (advisor) ; Hrabě, Petr (referee)
This thesis is engaged in research of influence of degradation processes on changes of mechanical properties of polymeric particle composites. In the first part, literal research, are listed basic informations about composite materials, their history, definition, distribution and utilization. It further describes the procedures that should be followed in designing bonded joints, and summarize the advantages and disadvantages of adhesive bonding technology. Subsequently, the literature research is dealing with a corrosion and its basic division. At the end of the first part of a thesis are informations about the types of
stress on bonded joints.
In a second part of a thesis is analyzed the procedure of the experiment itself. Its objective is to monitor the process of degradation, which acts on a bonded joints with different kinds of additives depending on time. As a degradation medium was chosen solution of utility water and road salt.
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