ASTM D4147-99(2013)
(Practice)Standard Practice for Applying Coil Coatings Using The Wire-Wound Drawdown Bar
Standard Practice for Applying Coil Coatings Using The Wire-Wound Drawdown Bar
SIGNIFICANCE AND USE
3.1 This practice is useful in the laboratory to simulate roll-coated films.
SCOPE
1.1 This practice covers a procedure for applying a coating film of uniform thickness on a flat panel using the wire-wound drawdown bar.
1.2 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
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Standards Content (Sample)
NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
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Designation: D4147 − 99 (Reapproved 2013)
Standard Practice for
Applying Coil Coatings Using The Wire-Wound Drawdown
Bar
This standard is issued under the fixed designation D4147; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope 4.2.1 Magnetic Chuck for securing steel panels to eliminate
bowing.
1.1 This practice covers a procedure for applying a coating
4.2.2 Vacuum Plate for securing very lightweight nonmag-
film of uniform thickness on a flat panel using the wire-wound
netic panels.
drawdown bar.
4.2.3 Tape for securing the top of thin-gage panels.
1.2 This standard does not purport to address all of the
4.2.4 Mechanical Drives, for securing panels and automat-
safety concerns, if any, associated with its use. It is the
ing the drawdown procedure.
responsibility of the user of this standard to establish appro-
priate safety and health practices and determine the applica-
5. Hazards
bility of regulatory limitations prior to use.
5.1 The flash points of most solvents used in coatings and
related products are low enough that adequate ventilation is
2. Summary of Practice
needed to avoid exceeding 25 % of the lower explosive limits
2.1 A flat panel is secured on a firm horizontal surface. An
of the solvent when preparing and baking the panels. These
ample amount of coating is poured across one end of the panel
solvents could be toxic, care should be taken to avoid inhala-
and the drawdown bar placed behind the coating. The bar is
tion of the vapors and unnecessary contact of the solvents with
then drawn with uniform pressure and speed along the length
the skin.
of the panel toward the operator to apply a uniform film. The
wet and dry film coating thickness obtained is dependent on the
6. Procedure
combination of the bar used, the volume solids of the coating,
6.1 Deburr panels so edges are smooth. Secure a flat panel
and the speed of the drawdown motion.
to be coated on a firm, uniform, level surface. To provide
sufficient testing surface pour an ample amount of coating
3. Significance and Use
across the end of the panel. Place the drawdown bar behind the
3.1 This practice is useful in the laboratory to simulate
coating and pull into the coating. Rotate the drawdown bar in
roll-coated films.
the coating to ensure complete wetting of the coating in the
threads of the bar. Apply uniform pressure across the contact
4. Apparatus
length of the drawdown bar and hold it firmly without allowing
4.1 Wire-Wound Drawdown Bars—A set of stainless steel
rotation. Using only one pass, draw the bar along the length of
wire-wound drawdown bars of sufficient diameter to prevent
and
...
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