Circular Drying Time Recorder

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1 Measure what you see. Circular Drying Time Recorder Operating Instructions A member of Additives & Instruments

Circular Drying Time Recorder Operating Instructions English PM-9600 PM-9601 PM-9602 PM-9603 BYK - Gardner USA 9104 Guilford Road Columbia, MD 21046 USA Phone 800-343-7721 301-483-6500

2 Circular Drying Time Recorder Operating Instructions English PM-9600 PM-9601 PM-9602 PM-9603 BYK - Gardner USA 9104 Guilford Road Columbia, MD USA Phone Fax BYK-Gardner GmbH Lausitzer Str. 8 D Geretsried Germany Tel gardner ( ) Fax

3 Description Description The BYK-Gardner Circular Drying-Time Recorder consists of a synchronous motor, mounted in a metal case on rubber-shod tripod, with its shaft positioned in the true vertical. A pivotable arm assembly is attached to this shaft and operates a counterpoised stylus, vertical stylus, consisting of a thermosetting Teflon sphere that does not stick to the drying film. A transparent plastic template, with scale graduations corresponding to the particular motor speed, is provided for timing the various stages of drying revealed by the scribed pattern under a 12-g load. 2

4 General Information General Information This instrument measures the air-drying characteristics of paints, varnishes, enamels, drying oils, lacquers, shellacs, adhesives and various other types of coatings and films applied to many types of plane surfaces. The various stages of drying and curing that occur in films are very difficult to define and evaluate satisfactorily in a quantitative manner. A study of all the factors that influence the reproducibility of drying-time data, done chiefly in the laboratories of the Advance Division, Carlisle Chemical Works, Inc., resulted in the circular recorder and template. 3

5 Operation Operation: After running several tests on known materials under controlled conditions, the operator can very easily correlate results obtained with the Circular Recorder and by the finger-touch method for determining the following stages of drying: 1. Set-to-touch: During the first stage of drying, the film is mobile and partially flows back into the scribed channel. The film may be considered setto-touch when it no longer flows back and the stylus begins to leave a clear channel. 2. Surface-dry: When the Teflon stylus no longer leaves a clear channel, but begins to rupture the dry upper layer of the curing film, the surface is considered to be dust-free. 3. Through-dry: Finally, when the stylus no longer ruptures or dents the film, but moves freely upon the surfact, the cross-section of the film may be considered to have reached the dryhard condition. Features: 1. Uniform Pressure: The counter-poised pivot arm maintains a load on the teflon stylus of exactly 12 grams. This pressure corresponds to the point of through-dry described above because, at this stage, a continuous film can be lifted from the panel completely intact. 2. Non-Sticking Stylus: The replaceable teflon stylus provided with this model reduces sticking and tearing to a minimum, thus producing sharp and clear endpoints. 3. Transparent Scale: The plastic template is transparent and permits both the center of rotation 4

6 Operation and the corresponding graduations on the rim of the circle to be located with great precision. 4. Portability: Compact in design, the Circular Recorder is 4 in diameter and 4½ high, and weighs about 1½ pounds. It can be operated on a laboratory bench, in a small environmental chamber, or in an oven at a temperature of up to 170 F. 5. Easy Maintenance: There is nothing to clean except the stylus. When it begins to wear flat, it should be immediately replaced; otherwise, the pressure at the contact point will decrease as the contact area increases. The true verticality of the stylus should be established with the right-angle guide provided. The motor lubricant is sealed in and requires no attention. An occasional drop of oil should be placed in the pivot pin of the horizontal arm. 6. Small Test Area: Applying wet films on long or large glass plates or other panels is not necessary since the scribed circle is only 2 in diameter. Any flat panel having a test area at least this size can be used. 7. Easy Panel Preparation: Panels of any desired composition and thickness may be employed. If the panel is of the same material that the coating will be applied to or as been formulated for, the actual drying characteristics of the coating system can be studied. The various stages of drying are greatly influenced by the actual thickness of the applied film. The BYK-Gardner Film Casting Knife lays wet films of any thickness from mils and is available in widths from 2 to Different Motor Speeds: The greatest precision is obtained when the motor speed and template 5

7 Operation just exceed the total drying time; therefore, a choice of motor speeds is available. The 1,, 6, 12 and 24 hour limits of the recorders fit the maximum drying times of most coating applications. 6

8 EDFIS 0408 Europe

Measure what you see. Film Casting Knife. Manual. Additives & Instruments. A member of

Measure what you see. Film Casting Knife Manual A member of Additives & Instruments Film Casting Knife Manual English 2325 2328 2326 2329 2327 4301 4304 4302 4305 4303 BYK - Gardner USA 9104 Guilford