ASTM D2067-97(2003)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation:D2067–97(Reapproved2003)
Standard Test Method for
Coarse Particles in Printing Ink Dispersions
This standard is issued under the fixed designation D 2067; 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 (e) indicates an editorial change since the last revision or reapproval.
1. Scope 3. Summary of Test Method
1.1 This test method covers the determination of the weight 3.1 A 50-g specimen of the test dispersion is diluted, if
concentration of coarse particles in printing ink dispersions by necessary, with a reducing varnish, mixed with 200 g of
sieve retention. mineral spirits or other mutually agreeable solvent, mixed in a
1.2 This test method is applicable to printing inks, flushed paint shaker for 30 min, and passed through a tared 325-mesh
pigments, and other pigment dispersions that contain particles wire cloth sieve. The sieve is dried in an oven and reweighed.
larger than 45 µm. With proper choice of solvent, it is The residue is reported either as a percentage or in parts per
applicable both to paste and liquid inks. million of the specimen.
3.2 The nature of the coarse particles may be identified
NOTE 1—This test method is similar in principle to Test Methods
through the use of a magnet and visual or microscopic
D 185. For particles under 25 µm, see Test Method D 1316.
examination.
1.3 The values stated in SI units are to be regarded as the
standard. The values given in parentheses are for information
4. Significance and Use
only.
4.1 Coarse particles in printing inks reduce the efficiency of
1.4 This standard does not purport to address the safety
the dispersion process, requiring not only extra milling passes,
concerns, if any, associated with its use. It is the responsibility
butalsofrequentchangesinpumpfilters.Inprintingprocesses,
of the user of this standard to establish appropriate safety and
they may cause excessive wear to metal plates, piling or
health practices and determine the applicability of regulatory
localized retention of ink on blankets and plates, and water
limitations prior to use.
balance problems. Coarse particles also reduce color strength
and the gloss of printed matter.
2. Referenced Documents
4.2 This test method is suitable for quality control. The
2.1 ASTM Standards:
precisionmaybeimprovedbytheuseofaspecimensizelarger
D 185 Test Methods for Coarse Particles in Pigments,
than that prescribed.
Pastes and Paints
4.3 Test results are sensitive to the type of washout solvent
D 235 Specification for Mineral Spirits (Petroleum Spirits)
used. Strong solvents are to be avoided because they may
(Hydrocarbon Dry Cleaning Solvent)
dissolve large particles of resin in the ink vehicle.
D 1316 Test Method for Fineness of Grind of Printing Inks
by the NPIRI Grindometer
5. Apparatus
E 11 Specification for Wire Cloth and Sieves for Testing
5.1 Wire-Cloth Sieve, preferably disposable, 325 mesh (45
Purposes
µm), 60.3 mm in diameter; alternatively, a 75-mm No. 325
E 145 Test Method for Gravity-Convection and Forced-
sieve conforming to Specification E 11.
Ventilation Ovens
NOTE 2—Adisposablesieveispreferredforprecisionbecauseitweighs
E 691 Practice for Conducting an Interlaboratory Study to
5 only 0.5 g compared to about 70 g for a conventional sieve.
Determine the Precision of a Test Method
5.2 Washout Cup Assembly (for use with the disposable
sieve), assembled according to the manufacturer’s instructions.
This test method is under the jurisdiction of ASTM Committee D01 on Paint,
5.3 Balance, sensitive to 1.0 mg, preferably 0.1 mg.
Related Coatings, Materials, and Applications and is the direct responsibility of
5.4 Paint Shaker.
Subcommittee D01.56 on Printing Inks.
5.5 Oven, gravity-convection type conforming to Type 1B
Current edition approved May 10, 2003. Published June 2003. Originally
approved in 1992. Last previous edition approved in 1997 as D 2067 – 97.
in Test Method E 145 and maintained at 110° 6 5°C.
Annual Book of ASTM Standards, Vol 06.03.
5.6 Mixing Container, such as a widemouth bottle or jar,
Annual Book of ASTM Standards, Vol 06.04.
with screw cap, capacity 473 mL(1 pt), preferably plastic. If a
Annual Book of ASTM Standards, Vol 06.02.
Annual Book of ASTM Standards, Vol 14.02. glass jar is used, a metal container such as a 1-lb coffee can
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
D2067–97 (2003)
with lid and foam packing are recommended for protecting the 8.7 Tare a clean dry sieve to 1 mg, preferably 0.1 mg, and,
jar while on the shaker. if disposable, set in place on the washout cup assembly. Pour
5.7 Spatula, suitable for mixing 100 g of material. the contents of the jar quickly through the sieve. Invert the jar
over the screen and rinse out with solvent from the wash bottle
6. Reagents and Materials until no color remains in the jar. Make sure that no residue
remains in the jar and that all solvent from the jar passes over
6.1 Washout Solvent, as mutually agreed upon between the
the screen.
producer and the user. Type I mineral spirits conforming to
8.8 Wash down the sides of the washout cup assembly (if
Specification D 235 has been found useful for oleoresinous
used) and the sides of the screen, collecting the residue close to
systems. The solvent should be filtered through a 325-mesh
the center of the sieve.
screen prior to use.
8.9 Place the sieve in a convection oven at 110°C for a few
6.2 ReducingVarnish, for high-viscosity or stiff dispersions.
min or until the screen and residue are dry. Cool in a desiccator
The varnish must be compatible with the test dispersion and of
and weigh. Record the weight of the residue.
a consistency such that a 50:50 mix will have sufficient flow to
8.10 Repeat 8.1 or 8.2 to 8.9 with a second specimen.
disperse in the washout solvent. An 800–1200 poise-reducing
8.11 If a reducing varnish was used (in 8
...