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BK Drying Time Recorder

6 -12 - 24 Hour Speeds



Measures and Records the Drying Time of Surface Coatings, etc.

Conforms To ASTM D 5895


The 3-Speed Drying Recorder defines stages in the drying process as:

  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.
 BK Drying Time Recorder
BK Drying Time Recorder
Item No. DT-BK3

A typical white enamel would have a drying time expressed as follows:

1-1/4 ----3-1/2----4 (hours)

Although all stages recorded are significant it is often sufficient to express a drying time in terms of set-time and hard-dry time, thus: 1-1/4 - 4 (hours). Brass weights, each weighing 5 g, may be used to apply greater pressure on the needles and thus record the through-drying properties of alkyds, varnishes and paints. The 3-SPEED BK DRYING RECORDER will give useful information about the gelation times of many two component surface coating materials and about the properties of such films.


Determination Of Drying Time

The drying time of alkyds, varnishes or paints is determined by adding the requisite drier and thinning to a viscosity at which the material is normally applied. The finish is allowed to stand at room temperature for 24 hours to "mature". A test strip measuring 12" x 1" (which may be of plain or ground glass or of other suitable material) is prepared by casting a film upon it by means of a special applicator which is accurately ground at one end to deposit a wet film thickness of .003" (3 mils) and 0.0015" (1-1/2 mils) at the other. The test strips are placed on the table between the brass studs and the instrument is then operated as indicated below.


Description

The recorder body is robustly constructed from light alloy and the mechanism is mainly stainless steel and brass to avoid corrosion. A needle carrier holding six hemispherical ended needles travels the length of the test strip in 6, 12 or 24 hours. Other speeds are available to special order. The instrument accommodates six test strips 12" x 1". A time scale is mounted on the side cover and is graduated to suit the three different speeds.



Method Of Use
  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.


DT-BK10 Recorder
Casterguide Film Applicator

The Casterguide enables clean, accurate castings of paints, printing inks and other surface coatings to be prepared quickly, confidently and without spillage for the determination of their drying times on the Recorder. It consists of a cast aluminum trough with a cutaway step at the end. Outside of casting is polished and inside machined to provide a ledge for supporting glass test strips.
DT-BK10 Recorder


6 & 10 Speed Models

These have independently paired operating tracks. Separate needle carriers are moved from parked positions by depressing individual plungers, sliding them along to zero positions and releasing plungers when operative. At end of travel, needle carriers are in parked positions. Unless otherwise specified, the tracks operate at a speed of 12 hours. If required, provision can be made for some of the paired tracks to operate at speeds of 2, 3, 4, 6, 12, 24, or 48 hours. (Specify) The technique for preparing test strips and for reading the results is the same as for the standard BK Drying Recorder.

 DT-BK6 Recorder
DT-BK6 Recorder



Available Items

BK3 & BK6 Drying Recorders come complete with six needles, a set of clear glass test strips and steel applicator with 3 mil and 6 mil cuts (.0015" & .003" wet film)
Item Number Item
DT-BK3

Standard 110 Volt 6-12-24 hrs (Available 3-6-12 hrs and 12-24-48 hrs)

Upgrades to Standard Model (Additional Cost):
Special 1/2-1-2 hrs / 1-2-4 hrs / 2-4-8 hrs / 24-48-96 hrs
Special Single Speed 12 minute, 24 minute or 48 minute.

DT-BK6 Standard Speed 110 Volt all tracks 12 hrs (Available in pairs 6-24-48 hrs)
Upgrade (Additional Cost): Special 1/2 to 96 hrs
BK10 Drying Recorder comes complete with ten needles and a set of clear glass test strips and steel applicator with 3 mil and 6 mil cuts (.0015" & .003" wet film)
DT-BK1O Standard Speed 110 Volt all tracks 12 hrs (Available in pairs 6-24-48 hrs)
Upgrade (Additional Cost): Special 1/2 to 96 hrs
Other speeds and 220 Volt models are available. Price & delivery dependent upon request.



Special Applicators
Item No. Item
DT-BK-A/S Steel
DT-BK-A/SS Stainless Steel
DT-BK-N Needles (one dozen)
DT-BK-BW Brass Weights (5 gms)
DT-BK-GS Clear Glass Strips (one dozen)
DT-BK-TSB 3/8" Diameter Teflon Stylus Balls, undrilled for use with needles (one dozen).
DT-BK-TSB/8 Same, drilled & attached to needle, Set of 6
DT-BK-MC Casterguide

 

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