ASTM_D_7680_-_10.pdf

Designation:D768010Standard Practice forPreparing Prints of Paste Printing Inks by a Motor-DrivenPrintability Tester1This standard is issued under the fixed designation D7680;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 practice describes the procedure for preparinglaboratory prints of paste printing inks using a motor-drivenprintability tester.1.2 This practice covers printability testers of four differentdesigns,referred to as Tester A,B,C,and D.These testersfeature“push-button”control of printing speed and pressureand facilitate measurement of exact ink film thickness.1.3 This practice is intended primarily for lithographic andletterpress inks that dry by oxidation or penetration.Withappropriate drying or curing equipment,it is also applicable toother systems such as heat-set or energy curable.1.4 This practice is applicable to the preparation of single-color solid-area prints by dry offset(also know as letterset)orby letterpress on any flat surface including paper,paperboard,plastic film,textiles,and metal.1.5 The values stated in SI units are to be regarded as thestandard.The only other unit of measurement used is fpm.1.6 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 and health practices and determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2D528 Test Method for Machine Direction of Paper andPaperboard(Withdrawn 2010)3D1475 Test Method For Density of Liquid Coatings,Inks,and Related ProductsD5039 Test Methods for Identification of Wire Side of Paper(Withdrawn 2009)3D6073 Test Method for Relative Setting of Heatset PrintingInksD7189 Test Method for Relative Mileage of News Ink onNewsprintD7305 Test Method for Reflection Density of Printed Matter2.2 Other Standards:4ISO 187 Paper,board and pulpsStandard atmosphere forconditioning and testing and procedure for monitoring theatmosphere and conditioning of samplesISO/DIS 28351 Graphic technologyLaboratory prepara-tion test printsPart 1:Paste inksISO 28461 Graphic technologySpecification for colorand transparency of printing ink setsPart 1:Inks forheat-set web offset lithographic printingISO 28462 Graphic technologySpecification for colorand transparency of printing ink setsPart 2:Inks forcoldset offset lithographic printing3.Terminology3.1 Symbols:fpm=feet per minute(fpm 200=m/s)kgf=kilograms of force(kgf=9.81 N)kp=kilopascals of pressure(kp=9.81 N)m/s=meters per second(m/s 200=fpm)3.2 Symbols for ink film thickness calculations:AS=printed area on the substrate,cm2D=density of the ink,g/cm2IFTP=ink film thickness on the plate,mIFTS=ink film thickness on the substrate,mm=micrometers1This practice is under the jurisdiction 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 Dec.1,2010.Published February 2011.DOI:10.1520/D768010.2For 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.3The last approved version of this historical standard is referenced onwww.astm.org.4Available 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 Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 WA=weight of inked plate after printing,gWB=weight of inked plate before printing,gWP=weight of ink carried on the plate,gWPO=weight of the clean uninked plate,gWS=weight of ink on the substrate,gWSA=weight of ink on the substrate per unit area,g/m24.Summary of Practice4.1 The designated printing speed and pressure are preset onthe print maker of the printability tester.A specified volume ofink is metered to the rollers of the inking system anddistributed for 15 to 25 s for heatset and newsinks,60 s or morefor other inks.The printing disk is inked for the same period oftime,installed on the print maker,and a print made on thedesignated substrate.4.2 The prints are dried by appropriate means and measuredfor reflection density in order to verify that the target value hasbeen achieved.4.3 If required by the test,the inked disk is weighted beforeand after printing and the exact ink film thickness on thesubstrate is computed.4.4 After a suitable lapse of time,the prints are subjected tothe intended end use test(s).Results are compared to those ofreference prints prepared in the identical fashion.5.Significance and Use5.1 It is g