After drawing on a surface the layer of a paint and varnish material is necessary for drying to receive a covering film. Process of drying of different paint and varnish materials proceeds unequally and depends by nature the last. Кровельные материалы - саморезы кровельные. Саморезы, дюбели.

Drying of some materials is reduced basically to evaporation and removal of solvents therefore the covering film is formed. Such materials concern nitrocellulose, perhlorvinilovye varnishes and enamels and some other. Drying of other materials represents more difficult process in which two phases distinguish: evaporation and removal of solvents, and then difficult chemical processes of oxidation, condensation, the polymerisations making 80 90% of duration of drying. Materials concern the given category on the basis of oils and of some synthetic pitches: oil paints, varnishes and enamels alkidnye, fenolno-formaldegidnye, melaminoalkidnye, mochevinoformaldegidnye and a number of others. обои на стену лучшие цены в магазине .

If drying process is carried out without heating at average temperature of the external environment (a shop premise) 15-25°С drying is called as natural; if the various devices raising temperature of environment in which drying process drying name artificial proceeds are applied. интернет аптека

For materials at which the film is formed as a result of evaporation and removal of flying evaporators, the natural drying proceeding quickly enough (look the chapter I) is more comprehensible; to artificial drying resort less often when it is necessary to accelerate process of hardening of a film (for example, at work perhlorvinilovymi enamels).

Process of natural drying of other paint and varnish materials proceeds rather slowly: on the average 18-24 ch, and in some cases and longer. Besides, a number of enamels at 18-25°С cannot form firm and mechanically strong film, therefore artificial drying is in most cases necessary.

At carrying out of natural drying following basic conditions should be observed: the temperature of a premise of shop should be not more low +12°С; relative humidity of air not above 65%; in shop there should be a sufficient air exchange (corresponding ventilation) and absence of a dust.

Artificial drying is carried out in the basic three ways: konvektsionnym, radiating and induction.