ASTM_D_7189_-_12_2020.pdf

Designation:D718912(Reapproved 2020)Standard Test Method forRelative Mileage of News Ink on Newsprint1This standard is issued under the fixed designation D7189;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 laboratory procedure fordetermining the relative mileage of news inks on newsprint.The test method utilizes a proofing press,analytical balanceand a reflection densitometer.1.2 This test method is intended for black oil-based newsinks that dry by penetration(that is,letterpress or web offset)and for which a suitable reference standard is available.Withappropriate optical instrumentation,it is also applicable tocolored news inks.1.3 This test method may also be used to determine therelative ink receptivity of test newsprints versus a referencestandard.1.4 The values stated in SI units are to be regarded as thestandard.The values given in parentheses are for informationonly.1.5 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 standard to establish appro-priate safety,health,and environmental practices and deter-mine the applicability of regulatory limitations prior to use.1.6 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision 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Documents2.1 ASTM Standards:2D528 Test Method for Machine Direction of Paper andPaperboard(Withdrawn 2010)3D685 Practice for Conditioning Paper and Paper Productsfor TestingD5039 Test Methods for Identification of Wire Side of Paper(Withdrawn 2009)3D7305 Test Method for Reflection Density of Printed Matter3.Terminology3.1 Definitions:3.1.1 ink mileage,nweight per unit area of ink required toachieve a given reflection density,laboratory units are g/m2.3.1.2 ink receptivity,nweight per unit area of ink requiredto achieve a target reflection density when comparing differentnewsprint stocks,units are g/m2.3.1.3 news ink,na pigmented paste composition that isapplied to newsprint by printing machinery.3.1.4 newsprint,npaper substrate made from wood pulpused chiefly for printing newspapers.3.1.5 reflection density,nthe light absorbing ability of amaterial,expressed as the logarithm of the reciprocal of thereflectance factor(that is,higher reflection density indicatesmore light is absorbed).3.2 Symbols:A=weight of inked plate after printing,gB=weight of inked plate before printing,gC=coverage(weight of ink)on the print,gCT=C required to achieve the target reflection density,gD=reflection densityM=mileage of an ink,or ink receptivity of a paper,g/m2S=printed area on the paper specimen,cm24.Summary of Test Method4.1 Laboratory prints of the test news ink on the designatednewsprint are made at various ink film weights giving reflec-tion densities that span the target value.4.2 The weight of ink on the print corresponding to thetarget density is determined graphically or by regression1This 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 1,2020.Published July 2020.Originally approvedin 2005.Last previous edition approved in 2012 as D7189 12.DOI:10.1520/D7189-12R20.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service as serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.3The last approved version of this historical standard is referenced onwww.astm.org.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United StatesThis 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.analysis.The resulting value for mileage,expressed as g/m2,iscompared to that obtained with the reference news ink tested inthe identical fashion.4.3 When the test method is used to compare differentnewsprint stocks with a reference newsprint,the relationship iscalled ink receptivity.5.Significance and Use5.1 Ink mileage on a production press is of economicimportance of the user of printing inks,the lower the mileagefigure,the less ink is required to produce a job.This testmethod provides a procedure