BK Drying Time Recorder

The BK 3 speed Drying Recorder has been used widely in the coatings industry throughout the world for several decades. A needle carrier holding six hemispherical ended needles travels the length of the six 12" x 1" test strips in 6, 12 or 24 hours. A time scale on the side cover is graduated to suit the three different travel times.

The BK10 Recorders have independently operating tracks allowing tests to be made at different start times. Pairs of tracks operate at the same speed, and a wide range of travel times are available. Travel times of 6, 12, 24 and 48 hours are all considered as standard. A time scale on the front cover is graduated to suit the instrument's drying time ranges. Each pair of tracks has its own individual operating switch.

1. Select the required speed by turning the speed control knob in a clockwise direction and sliding in or pulling out to the required speed. Release knob.
2. Apply film to the test strips and place them on the Recorder.
3. Lift the release lever on the back of the needle carrier and slide it to the starting position.
4. Lower the needles on to the test strips.
5. Switch on and the needles will now commence the run along the strips. On reaching the end of the travel, the carrier automatically stops. Switch off.
6. Individual glass strips may be removed from the machine simply by depressing one end at the strip so that the opposite end tilts clear at the holder.

1. The first stage is a pear-shaped impression corresponding to the time taken for evaporation of solvent.
2. The second stage is the cutting of a continuous track, corresponding to a sol-gel transition.
3. The third stage is an interrupted track corresponding to the surface-dry time.
4. A fourth stage is where the needle no longer penetrates the film, corresponding to the final drying time.

A typical white enamel would have a drying time expressed as follows: 1-1/4 ----- 3-1/2 ----- 4 (hours)

Applicator

Caster Guide

The Applicator is a 25 mm stainless steel cube uses to apply paint. It has a hole drilled centrally from one face through to the opposite face. From each end of this hole a gap 12 mm wide is ground from the hole to one side of the applicator, thus providing 2 gaps per applicator. The applicator is placed at one end of the glass strip with the ground gap facing the end. Paint is poured into the hole and the applicator is steadily drawn down the glass strip and off the other end, the gap being the trailing end of the applicator. Paint will flow through the gap depositing a 12 mm wide film on the glass strip.

• The standard applicator has a gap depth of 75 microns (3 mils) one end and 150 microns (6 mils) the other, which will apply a paint film thickness of approximately half the gap size.
• Any gap depth between 10 and 650 microns can be supplied to suit customer requirements.
  

The Casterguide is a device used for simplifying and “tidying-up” the process of applying the paint film to the glass strip. It consists of a cast aluminum trough with a ledge on each side to carry the glass strip and a step one end to allow the user to hold the strip in place. The applicator is positioned on the glass stirp at the step end and filled with paint as described above. When using the applicator the casterguide ensures that the film is applied centrally and, as the applicator is drawn off the end of the glass strip, the surplus paint is collected in the trough underneath. This operation may be repeated several times before cleaning is necessary. Use suitable solvents to clean, do not use caustic alkali or caustic detergents since these will attack the aluminum metal.

• Simple device used for making a clean applicationf of paint or coatings
• Cast aluminum construction.