ASTM D2067-97(2008)e1
(Test Method)Standard Test Method for Coarse Particles in Printing Ink Dispersions
Standard Test Method for Coarse Particles in Printing Ink Dispersions
SIGNIFICANCE AND USE
Coarse particles in printing inks reduce the efficiency of the dispersion process, requiring not only extra milling passes, but also frequent changes in pump filters. In printing processes, they may cause excessive wear to metal plates, piling or localized retention of ink on blankets and plates, and water balance problems. Coarse particles also reduce color strength and the gloss of printed matter.
This test method is suitable for quality control. The precision may be improved by the use of a specimen size larger than that prescribed.
Test results are sensitive to the type of washout solvent used. Strong solvents are to be avoided because they may dissolve large particles of resin in the ink vehicle.
SCOPE
1.1 This test method covers the determination of the weight concentration of coarse particles in printing ink dispersions by sieve retention.
1.2 This test method is applicable to printing inks, flushed pigments, and other pigment dispersions that contain particles larger than 45 μm. With proper choice of solvent, it is applicable both to paste and liquid inks.
Note 1—This test method is similar in principle to Test Methods D185. For particles under 25 μm, see Test Method D1316.
1.3 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.
1.4 This standard does not purport to address 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.
General Information
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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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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: D2067 − 97 (Reapproved2008)
Standard Test Method for
Coarse Particles in Printing Ink Dispersions
This standard is issued under the fixed designation D2067; 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.
ε NOTE—Corrected research report information in Section 11 editorially in September 2010.
1. Scope Determine the Precision of a Test Method
1.1 This test method covers the determination of the weight
3. Summary of Test Method
concentration of coarse particles in printing ink dispersions by
sieve retention.
3.1 A 50-g specimen of the test dispersion is diluted, if
necessary, with a reducing varnish, mixed with 200 g of
1.2 This test method is applicable to printing inks, flushed
mineral spirits or other mutually agreeable solvent, mixed in a
pigments, and other pigment dispersions that contain particles
paint shaker for 30 min, and passed through a tared 325-mesh
larger than 45 µm. With proper choice of solvent, it is
wire cloth sieve. The sieve is dried in an oven and reweighed.
applicable both to paste and liquid inks.
The residue is reported either as a percentage or in parts per
NOTE 1—This test method is similar in principle toTest Methods D185.
million of the specimen.
For particles under 25 µm, see Test Method D1316.
3.2 The nature of the coarse particles may be identified
1.3 The values stated in SI units are to be regarded as the
through the use of a magnet and visual or microscopic
standard. The values given in parentheses are for information
examination.
only.
1.4 This standard does not purport to address the safety
4. Significance and Use
concerns, if any, associated with its use. It is the responsibility
4.1 Coarse particles in printing inks reduce the efficiency of
of the user of this standard to establish appropriate safety and
the dispersion process, requiring not only extra milling passes,
health practices and determine the applicability of regulatory
butalsofrequentchangesinpumpfilters.Inprintingprocesses,
limitations prior to use.
they may cause excessive wear to metal plates, piling or
localized retention of ink on blankets and plates, and water
2. Referenced Documents
balance problems. Coarse particles also reduce color strength
2.1 ASTM Standards:
and the gloss of printed matter.
D185 Test Methods for Coarse Particles in Pigments
4.2 This test method is suitable for quality control. The
D235 Specification for Mineral Spirits (Petroleum Spirits)
precisionmaybeimprovedbytheuseofaspecimensizelarger
(Hydrocarbon Dry Cleaning Solvent)
than that prescribed.
D1316 Test Method for Fineness of Grind of Printing Inks
By the NPIRI Grindometer
4.3 Test results are sensitive to the type of washout solvent
E11 Specification for Woven Wire Test Sieve Cloth and Test
used. Strong solvents are to be avoided because they may
Sieves
dissolve large particles of resin in the ink vehicle.
E145 Specification for Gravity-Convection and Forced-
Ventilation Ovens
5. Apparatus
E691 Practice for Conducting an Interlaboratory Study to
5.1 Wire-Cloth Sieve, preferably disposable, 325 mesh (45
µm), 60.3 mm in diameter; alternatively, a 75-mm No. 325
1 sieve conforming to Specification E11.
This test method is under the jurisdiction of ASTM Committee D01 on Paint
and Related Coatings, Materials, andApplications and is the direct responsibility of
NOTE2—Adisposablesieveispreferredforprecisionbecauseitweighs
Subcommittee D01.56 on Printing Inks.
only 0.5 g compared to about 70 g for a conventional sieve.
Current edition approved Nov. 1, 2008. Published November 2008. Originally
approved in 1992. Last previous edition approved in 2003 as D2067 – 97 (2003).
5.2 Washout Cup Assembly (for use with the disposable
DOI: 10.1520/D2067-97R08E01.
sieve), assembled according to the manufacturer’s instructions.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
5.3 Balance, sensitive to 1.0 mg, preferably 0.1 mg.
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. 5.4 Paint Shaker.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
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D2067 − 97 (2008)
5.5 Oven, gravity-convection type conforming to Type 1B container lined with foam or other soft material before locking
in Specification E145 and maintained at 110° 6 5°C. between the jaws of the shaker.
5.6 Mixing Container, such as a widemouth bottle or jar, 8.5 Turn the shaker on and let run for 30 min.
with screw cap, capacity 473 mL(1 pt), preferably plastic. If a
8.6 When the shaker stops, remove the jar, unscrew the lid
glass jar is used, a metal container such as a 1-lb coffee can
and carefully remove the plastic sheet. Using a wash bottle
with lid and foam packing are recommended for protecting the
containing the same solvent as in 8.3, wash down the plastic
jar while on the shaker.
sheet into the jar containing the dissolved specimen.
5.7 Spatula, suitable for mixing 100 g of material.
8.7 Tare a clean dry sieve to 1 mg, preferably 0.1 mg, and,
if disposable, set in place on the washout cup assembly. Pour
6. Reagents and Materials
the contents of the jar quickly through the sieve. Invert the jar
6.1 Washout Solvent, as mutually agreed upon between the
over the screen and rinse out with solvent from the wash bottle
producer and the user. Type I mineral spirits conforming to
until no color remains in the jar. Make sure that no residue
Specification D235 has been found useful for oleoresinous
remains in the jar and that all solvent from the jar passes over
systems. The solvent should be filtered through a 325-mesh
the screen.
screen prior to use.
8.8 Wash down the sides of the washout cup assembly (if
6.2 ReducingVarnish, for high-viscosity or stiff dispersions.
used) and the sides of the screen, collecting the residue close to
The varnish must be compatible with the test dispersion and of
the center of the sieve.
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