Drying Time Recorder

The new TQC Drying Time Recorder is a fully digitally controlled machine that operates conform the BK (Beck Koller) method

The TQC Drying Time Recorder is a fully digitally controlled machine to define the different stages in the drying process of paints and coatings. The TQC Drying Time Recorder operates conform the BK (Beck Koller) method. Defining the final result or checking intermediate stages is very easy by means of the clear digital display and the intuitive interface. The compact machine meets ASTM D5895, ISO 9117-4 and DIN EN 14022. The TQC Drying Time Recorder has six tracks, and comes with two robust and reusable glass beds of 100 X 350 X 3 mm. Optional are six narrow glass beds in special adapters.

The front panel of the TQC Drying Time Recorder is made out of clear glass, which is easy to clean and protects the display underneath it. The TQC Drying Time Recorder is powered by a safe 24 V DC power supply.

Standards: DIN EN 14022, ASTM D5895, ISO 9117-4

Operating is very easy with the Triple i operating interface. This unique systems guide the operator through the interface of TQC lab-machines. At each step of the operating menu the interface detects which buttons are active and indicates these by means of an illuminated red centre. This results in a very intuitive operating system which is enhanced with information on the machine’s display.

TQC Film Applicator with 3 reservoirs. Ideal for applying paint with use of a TQC Automatic Film Applicator or Drying Time Recorder. This applicator can apply 2 pre-defined thicknesses, 90 and 150 microns.

Why does paint dry on the wall but does not harden when in the tin?

There are two basic mechanisms by which paints dry on the wall.
Many modern paints are largely water-based. As we know, water readily evaporates. However, the rate of evaporation of a liquid depends on the vapour pressure of that liquid above the surface. In a sealed tin of paint, a set vapour pressure is quickly established in the small headspace in the tin and the water in the paint does not evaporate and remains in the paint. But, when painted on the wall, the water can readily evaporate to leave a dried film of solid paint components behind – there is no build-up of water vapour pressure in a confined space as there is in the tin.

Other paints, especially those manufactured some time ago, are by contrast largely oil-based. Unlike water, the oil does not evaporate. These paints dry on the wall in a very different way, through a chemical reaction with the oxygen in the air. This causes the relatively small molecules in the oil to form much larger molecules which have a solid rather than liquid form (i.e. polymers are formed). In the sealed tin, oxygen is not available for this chemical reaction to occur, and the oil remains in its original, fluid (smaller molecule) form.

These two distinct mechanisms account for the contrasting behaviour of paints in a sealed tin and on a wall.

How does paint dry?

As the paint dries, a film is formed which adheres to the surface of the material to which it is being applied.

Emulsion paints dry by a physical process involving the evaporation of water followed by coalescence of the polymer droplets and their subsequent integration into a hard polymer matrix that acts as a binder for the pigment.

On applying gloss paints, the alkyd polymer cross-links by an oxidation reaction with oxygen in the air once the solvent has largely evaporated. This reaction is accelerated using salts of transition metals (for example, cobalt and manganese naphthenates). The transition metal ion (with variable oxidation state) catalyses cross linking of the polymer chains, producing a hard surface film to the paint.

How does gloss paint dry?

The binder or film former in gloss paint is called an alkyd resin. … When the solvent evaporates, the oxygen of the air interacts with the resin which results in the formation of cross links between the polymer molecules and produces a strong, dry film.

How long does it take for latex paint to dry?

How long does latex paint take to dry between coats? The majority of latex paints when applied at room temperature will be dry set-to-touch within one hour or less and may be recoated within four hours. Poor ventilation, low temperatures, thick films and high humidity will increase these times.

How long does it take for latex paint to cure?

A second or third coat can typically be applied within three to five hours. Because latex paint dries on the outside first, it takes at least 14 days for it to cure. If the paint is in an area with bad curing conditions, it could take up to 30 days.

How long does it take for Polycrylic to cure?

At least 3 coats are recommended. If unable to recoat within 1½ hours, wait at least 72 hours then lightly sand and recoat. Polycrylic™ dries to the touch in 30 minutes and can be handled after 1 hour. After final coat, allow 24 hours before normal use.

CurveX

Paint Oven Data Recorder

Profiling an industrial powder coating oven starts right here with the CurveX-3 Oven Logger standard KIT. It contains all necessary items, just add the desired magnetic or clamp-type probes to make the oven logger KIT complete.

TQC-CurveX has 3 different types for different applications. Standard model CurveX-3 is a 6 channel datalogger with a total memory of 250000 measuring points, which is fitted with a large full-colour touchscreen for easy menu-driven operation and quick display of measurement results. CurveX-3 Standard Kit comes complete with isolation box for temperatures up to 300°C, and a heat sink (energy absorber) allowing longer operations inside the oven. Standard isolation box CX2005 allows more than 3 hours operation at 200°C. Optional isolation boxes up to 500°C and also suitable for silicone free applications are also available for different applications.. The oven data tracker is fitted with a large display for easy menu-driven operation and quick display of measurement results. Magnetic or clamp type surface and air temperature probes are available with different cable lenghts.

CurveX-3 Basic is a 4 channel version for 3 surface and 1 air probe applications like Qualicoat tests. Instead of display screen, it is equipped with multi colored indication lights. Its ease of use and affordable price level makes it the ideal job-coaters instrument. By programming the "paint type" by "Ideal Finish" analysis software, it gives you a PASS/FAIL result right after the run, even without connecting the device to the computer. Standard CurveX-3 Basic Kit includes Insulation box, data cable, saoftware and user manual, and logger bracket which is enough for wet paint applications as well as powder coating ovens. However for longer and more frequent runs at higher temperatures which powder coatings requires, it is recommended to have also the optional CX2011 Energy Absorber heat sink.

CurveX-3 Nano is developped specially developed for can coating industry, With its cylindirical form, CurveX-3 Nano travels in the oven through the conveyor together with the cans, and makes up a complete temperature profile. CurveX-3 Nano, has 2 type of end-caps which for both interior or exterior coating process of the cans. While for the cure analysis of the interior can coating, the cylindirical shape end-caps can be used and for testing the exterior can coating line, the CurveX 3 Nano has a special set of end-caps with adjustable fittings. These end-caps allow the data logger to be slided over a pin. Once in place, the position on the pin can be quickly fixed with 2 butterfly bolts. CurveX-3 Nano also has for 4 channels and it is delivered together with 4 Thermocouple wire probes.