And here the designers are trying to connect the fantasy of a simple device to do this work of art. Depending on in which room will be used clock, choose the material for the dial. James A. Levine, M.D. addresses the importance of the matter here. This can be wood, plastic, metal, ceramics, glass, Plexiglas or even a combination of them. Hours Kitchen should be water-resistant and heat resistant: the cooking temperature in the kitchen is much higher than in other areas of the house. In the manufacture of the watch designed for conference rooms, living rooms, bedrooms, can be used more "whimsical" materials (wood, cloth) and embossed surface. Because in such premises on the dial does not get fat deposit, their purification can be performed dry, ie, the dust just wiped with a soft cloth. One of the universal material for the clock dial was MDF – boards made of wood fibers by dry pressing under high pressure and temperature. It gives the possibility implement a variety of fancy interior designers, therefore, widely used for walls, facades, furniture, interior doors. Like wood, it perfectly processed and produces beautiful embossed surface. However, the MDF panels have several advantages: they are fairly resistant to changes in temperature and humidity in the room, and thus can be used as a "dry" rooms, and kitchens, in bathrooms, halls with fountains and mini-pools. Additionally, the decorative finish such surfaces is infinitely large: the plates can be coated with enamel, lacquer, wood veneer, PVC film, run smooth or volume, with 3D-effect. All these advantages decorative MDF panels made them an attractive material used for manufacturing various accessories for the interior, including the original clocks.
But here comes the problem of energy conservation. This problem concerns not only the glass in large formats, but also domestic premises: apartments, houses, child care, etc. As a rule, through the wooden box on order (at subject to the application of ordinary glass), lost 40-50% of thermal energy, so all the major manufacturers of glass mastered the production of energy-saving glass. Giving the energy-saving properties of glass connected with drawing on his low-emission surface of the optical coating and the glass itself with such a coating has been called low-emissivity. These coatings provide a passage into the room shortwave, solar radiation, but prevents the exit from the premises longwave thermal radiation, for example, the heater (and therefore low-emission glass is also called selectivity). Characteristic energy is emissivity glass. Coefficient of thermal radiation is a characteristic of the surface rather than the whole body and it is the same physical characteristics, such as density, melting point, etc. By emissivity glass (emission) to understand the ability of the glass surface to reflect the long-wavelength not visible to the human eye, thermal radiation, whose wavelength is less than 16,000 Nm. Emissitent surface (E) determines the emissivity glass (of conventional E-glass is 0.83, while the less selective 0.04) and, consequently, the possibility as it is reflected back into space thermal radiation. The cause of radiation lies in the movement of free electrons of atoms on the surface of the glass, and the density of moving electrons. Not all metals, well-conductive, have the property to reflect dlinovolnovoe thermal radiation. .