Sames Kremlin 25-2000µ 000790020 Каталог онлайн [113/120] 869914

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spraying & equipment

Catalog V5.3

General informations

Spray gunsMachines & Controllers PumpsAccessoriesGeneral informations

Temperatures (°C) Viscosity - CA4 (seconds)

Spray gun output (cm3/mm)

morning, cool workshops 15 23 460

Later - workshop heats up 20 20 520

An oven switched on 25 17 560

Paint

Quality problems tend to arise when the temperature of the paint changes during the course of

the day. For example : During the course of this day, the viscosity of the paint has moved from

23 to 17 seconds, which leads to a 22 % increase in the output of the spray guns, leading to

over-coloring and excessive product consumption.

Worse still, paint prepared in a hot workshop at 20 seconds can be at 28 seconds the following

morning, before the workshop has got up to full working temperature: this would lead to a less fine

spray and a much greater drying time.

Drying of paints

he component of paint can be classed in two groups :

Dry extracts

VOC (Volatile organic compounds), or water in case of water-based paints

Drying paint is all about allowing the volatile products to evaporate and the film to harden. We must

distinguish between hardening and drying.

Drying gives us the dry film purely by the evaporation of the volatile products. This happens at two

stages: during spraying and within the film. Depending on the temperature, the density of the spray,

the type of spray gun and the distance of the spray, the paint can arrive on the surface more or

less dry. That means that the majority of the solvent has evaporated before the paint reaches the

surface. The drying of the wet film is accelerated when the surface is in a well-ventilated area which

has dry air and is dust-free.