ASTM_D_2067_-_97_2013.pdf

Designation:D206797(Reapproved 2013)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 revision.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 retention.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 under 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 the safetyconcerns,if any,associated with its use.It is the responsibilityof the user of this standard to establish appropriate safety andhealth practices and determine the applicability of regulatorylimitations prior to use.2.Referenced Documents2.1 ASTM Standards:2D185 Test Methods for Coarse Particles in PigmentsD235 Specification for Mineral Spirits(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 Interlaboratory 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 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 and 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,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 solventused.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 for 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.5.3 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 Container,such as a widemouth bottle or jar,with screw cap,capacity 473 mL(1 pt),preferably plastic.If a1This test method is under the jurisdiction of ASTM Committee D01 on Paintand Related Coatings,Materials,and Applications and is the direct responsibility ofSubcommittee D01.56 on Printing Inks.Current edition approved June 1,2013.Published July 2013.Originally approvedin 1992.Last previous edition approved in 2008 as D2067 97(2008)1.DOI:10.1520/D2067-97R13.2For referenced ASTM standards,visit the 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 States1 glass jar is used,a metal container such as a 1-lb coffee canwith lid and foam packing are recommended for protecting thejar while on the shaker.5.7 Spatula,suitable for mixing 100 g of material.6.Reagents and Materials6.1 Washout Solvent,as mutually agreed upon between theproducer and the user.Type I mineral spirits conforming toSpecification D235 has been found useful for oleoresinoussystems.The solvent should be filtered through a 325-meshscreen prior to use.6.2 Reducing Varnish,for high-viscosity or stiff dispersions.The varnish must be compati