1、Designation:D206797(Reapproved 2020)Standard Test Method forCoarse Particles in Printing Ink Dispersions1This standard is issued under the fixed designation D2067;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revis
2、ion.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This test method covers the determination of the weightconcentration of coarse particles in printing ink dispersions bysieve retentio
3、n.1.2 This test method is applicable to printing inks,flushedpigments,and other pigment dispersions that contain particleslarger than 45 m.With proper choice of solvent,it isapplicable both to paste and liquid inks.NOTE1This test method is similar in principle to Test Methods D185.For particles unde
4、r 25 m,see Test Method D1316.1.3 The values stated in SI units are to be regarded as thestandard.The values given in parentheses are for informationonly.1.4 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility of the user of this
5、standard to establish appro-priate safety,health,and environmental practices and deter-mine the applicability of regulatory limitations prior to use.1.5 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision
6、 on Principles for theDevelopment of International Standards,Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:2D185 Test Methods for Coarse Particles in PigmentsD235 Specification for Mineral Spirits(
7、Petroleum Spirits)(Hydrocarbon Dry Cleaning Solvent)D1316 Test Method for Fineness of Grind of Printing InksBy the NPIRI GrindometerE11 Specification for Woven Wire Test Sieve Cloth and TestSievesE145 Specification for Gravity-Convection and Forced-Ventilation OvensE691 Practice for Conducting an In
8、terlaboratory Study toDetermine the Precision of a Test Method3.Summary of Test Method3.1 A 50-g specimen of the test dispersion is diluted,ifnecessary,with a reducing varnish,mixed with 200 g ofmineral spirits or other mutually agreeable solvent,mixed in apaint shaker for 30 min,and passed through
9、a tared 325-meshwire cloth sieve.The sieve is dried in an oven and reweighed.The residue is reported either as a percentage or in parts permillion of the specimen.3.2 The nature of the coarse particles may be identifiedthrough the use of a magnet and visual or microscopicexamination.4.Significance a
10、nd Use4.1 Coarse particles in printing inks reduce the efficiency ofthe 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 orlocalized retention of ink on blankets and plates,
11、and waterbalance problems.Coarse particles also reduce color strengthand the gloss of printed matter.4.2 This test method is suitable for quality control.Theprecision may be improved by the use of a specimen size largerthan that prescribed.4.3 Test results are sensitive to the type of washout solven
12、tused.Strong solvents are to be avoided because they maydissolve large particles of resin in the ink vehicle.5.Apparatus5.1 Wire-Cloth Sieve,preferably disposable,325 mesh(45m),60.3 mm in diameter;alternatively,a 75-mm No.325sieve conforming to Specification E11.NOTE2Adisposable sieve is preferred f
13、or precision because it weighsonly 0.5 g compared to about 70 g for a conventional sieve.5.2 Washout Cup Assembly(for use with the disposablesieve),assembled according to the manufacturers instructions.1This test method is under the jurisdiction of ASTM Committee D01 on Paintand Related Coatings,Mat
14、erials,and Applications and is the direct responsibility ofSubcommittee D01.56 on Printing Inks.Current edition approved June 1,2020.Published June 2020.Originallyapproved in 1992.Last previous edition approved in 2013 as D2067 97(2013).DOI:10.1520/D2067-97R20.2For referenced ASTM standards,visit th
15、e ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United Sta
16、tesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.15.3 Balance,sensitive to 1.0 mg,preferably 0.1 mg.5.4 Paint Shaker.5.5 Oven,gravity-convection type conforming to Type 1Bin Specification E145 and maintained at 110 6 5C.5.6 Mixing C
