• TECHNOLOGIES

    Effect of Overlay Paper Properties on the Surface Quality of Laminate Flooring

    Machines. Technologies. Materials., Vol. 16 (2022), Issue 6, pg(s) 199-201

    In this study, the effect of overlay paper properties on the surface quality of laminate flooring was investigated. For this aim, only the upper surface of 22 gr/m² raw overlay papers impregnated with 53% melamine formaldehyde resin in the glue pool was sprinkled by corundum (Al2O3) in two different ratios (23 and 28 gr/m²) from different companies at 140-160 ºC. In the drying ovens, the impregnated overlay papers with a final weight of 135 and 140 gr/m² and a humidity of 7.5% were produced. The panels obtained at the end of these processes were tested according to TS-EN 14323 and related standards, which are surface quality features such as surface abrasion, surface scratch and ash test. According to the test results, it has been observed that under the same pressing conditions, different corundum type and amount as well as laminate floorings covered with overlay papers with different final weights have an effect on the surface quali ty properties. It was observed that although the increase in the amount of corundum did not have a significant effect on surface scratching, it had a significant effect on surface wear values. According to the results of the ash test, it was observed that the amount of corundum increased and its distribution on the overlay paper surface was homogeneous.

  • TECHNICAL FACILITIES FOR ENSURING SECURITY

    MODIFIED PETRURGICAL MATERIALS BASED ON SEDIMENTARY ROCKS USED FOR BALLISTIC PURPOSES

    Security & Future, Vol. 3 (2019), Issue 4, pg(s) 182-184

    Bulgaria has a variety of deposits (mainly in northeastern Bulgaria) of sedimentary rocks (marls) suitable for the development of compounding formulations and technology for the production of stone products. On the basis of some of these sedimentary rocks (marls), experimental technologies for innovative formulations with modifiers for usable petrurgical materials are developed and tested. The first prototypes of ballistic protection products are obtained, with physic-mechanical properties better than those when only natural sedimentary rock is used, and lighter and cheaper than in the case of corundum and silicon carbide.
    The properties of these materials allow for certain alternative applications such as the ballistic protection of ground-based mobile and stationary objects. They also make possible the production of quality articles with protective properties against high-speed kinetic effects, but at significantly lower cost than when traditional materials are used.

  • MATERIALS

    MODIFIED PETRURGICAL MATERIALS BASED ON SEDIMENTARY ROCKS USED FOR BALLISTIC PURPOSES

    Machines. Technologies. Materials., Vol. 13 (2019), Issue 12, pg(s) 566-568

    Bulgaria has a variety of deposits (mainly in northeastern Bulgaria) of sedimentary rocks (marls) suitable for the development of compounding formulations and technology for the production of stone products. On the basis of some of these sedimentary rocks (marls), experimental technologies for innovative formulations with modifiers for usable petrurgical materials are developed and tested. The first prototypes of ballistic protection products are obtained, with physic-mechanical properties better than those when only natural sedimentary rock is used, and lighter and cheaper than in the case of corundum and silicon carbide.
    The properties of these materials allow for certain alternative applications such as the ballistic protection of ground-based mobile and stationary objects. They also make possible the production of quality articles with protective properties against high-speed kinetic effects, but at significantly lower cost than when traditional materials are used.