1、Designation:D648710(Reapproved 2019)Standard Practice forPreparing Prints of Paste Printing Inks Using a HandOperated Laboratory Flat-Bed Press1This standard is issued under the fixed designation D6487;the number immediately following the designation indicates the year oforiginal adoption or,in the
2、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 practice covers the procedure for preparing printsof paste inks using a hand operated fla
3、t-bed laboratory proofpress.The initial method was developed by the NationalPrinting Ink Research Institute.21.2 This practice is applicable to the preparation of single-color solid-area prints by the dry offset process(also known asLetterset)on a flat substrate such as paper or metal.It canreadily
4、be adapted to print by direct letterpress.3NOTE1The proofing press described in this practice can also be usedwith printing gages in accordance with Practice D6846.1.3 This practice is applicable primarily to lithographic andletterpress inks that dry by oxidation or penetration.With theaddition of a
5、ppropriate drying or curing equipment,it is alsoapplicable to other systems such as heat-set or energy-curable.1.4 The instructions in this practice are intended to mini-mize the within-print and among-operator variability inherentin hand operations.1.5 This practice does not measure the actual film
6、 thicknesson the print,but evaluates film thickness equivalence by visualor instrumental comparisons of reflection density.1.6 The values stated in SI units are to be regarded as thestandard.The values given in parentheses are for informationonly.1.7 This standard does not purport to address all of
7、thesafety concerns,if any,associated with its use.It is theresponsibility of the users of this standard to establish appro-priate safety,health,and environmental practices and deter-mine the applicability of regulatory limitations prior to use.Specific precautions are given in Section 7.1.8 This int
8、ernational 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)Co
9、mmittee.2.Referenced Documents2.1 ASTM Standards:4D6073 Test Method for Relative Setting of Heatset PrintingInksD6846 Practice for Preparing Prints of Paste Printing Inkswith a Printing GageD7305 Test Method for Reflection Density of Printed Matter2.2 ANSI Standards:5PH 2.30 Viewing Conditions for G
10、raphic Arts andPhotographyColor Prints,Transparencies and Photome-chanical ReproductionsCGATS.5 Graphic TechnologySpectral Measurements andColormetric Computation for Graphics Arts Images3.Summary of Practice3.1 Prints are prepared by metering the test ink onto abrayer,rolled out evenly,on the distr
11、ibution plate according toa specified pattern,and then transferred to the printing plate.The substrate is clipped onto the impression plate,and theblanket cylinder is rolled over the inked plate six timesfollowed by once over the substrate.3.2 After the print is dry to the touch,it is evaluated vers
12、usthe target reflection density instrumentally or by visual com-parison with a standard reference print.Subsequent prints canbe made if the target reflection density has not been achievedor if a visual assessment indicates that either more or less inkis needed.1This practice is under the jurisdictio
13、n of ASTM Committee D01 on Paint andRelated Coatings,Materials,and Applications and is the direct responsibility ofSubcommittee D01.56 on Printing Inks.Current edition approved Jan.1,2019.Published January 2019.Originallyapproved in 1999.Last previous edition approved in 2010 as D6487 10.DOI:10.1520
14、/D6487-10R19.2“The NPIRI Standard Procedure for Preparing Little Joe Prints,”American InkMaker,March 1994,pp.42-50.3The apparatus used to develop this method was the Little Joe Offset ColorProofing Press.4For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Servi
15、ce at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.5Available from American National Standards Institute(ANSI),25 W.43rd St.,4th Floor,New York,NY 10036,http:/www.ansi.org.Copyright ASTM International,100 Barr Har
16、bor 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.1 4.Significance and Use4.1 Laboratory proofing of ink is necessary to establish areproducible prediction of print appe
