1、Designation:D718912Standard 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 pare
2、ntheses 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,
3、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 new
4、s 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 test method does not purport to add
5、ress all of thesafety concerns,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and to determine theapplicability of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2D528 Test Method
6、 for Machine Direction of Paper andPaperboard(Withdrawn 2010)3D685 Practice for Conditioning Paper and Paper Productsfor Testing(Withdrawn 2010)3D5039 Test Methods for Identification of Wire Side of Paper(Withdrawn 2009)3D7305 Test Method for Reflection Density of Printed Matter3.Terminology3.1 Defi
7、nitions: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 p
8、igmented 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 fact
9、or(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
10、 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 corres
11、ponding to thetarget density is determined graphically or by regressionanalysis.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 refere
12、nce 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 test1This test method is under the jurisdiction of ASTM
13、 Committee D01 on Paintand Related Coatings,Materials,and Applications and is the direct responsibility ofSubcommittee D01.56 on Printing Inks.Current edition approved June 1,2012.Published July 2012.Originally approvedin 2005.Last previous edition approved in 2005 as D7189 05.DOI:10.1520/D7189-12.2
14、For 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 reference
15、d onwww.astm.org.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 method provides a procedure by which news inks can beassessed for mileage or newsprint stocks for ink receptivity inthe laboratory.5.2 Because of the many variables that exi
16、st among labora-tory and production presses,this test method is apt to yieldmore meaningful information when results are expressed on arelative rather than an absolute basis.6.Apparatus6.1 Laboratory Print Makerpreferably a motor drivenprintability tester capable of setting print pressure and havinga readily removable printing plate that can be accommodatedon an analytical balance.6.2 Printing Platetypically a solid-faced disk composedof aluminum,rubber-covered aluminum,or rubber-coverednylon.Re
