1、Designation:F 1444 00(Reapproved 2004)Standard Test Method forDetermining Dynamic Thermal Response of Direct ThermalPaper-Label Printer Method1This standard is issued under the fixed designation F 1444;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(e)indicates an editorial change since the last revision or reapproval.1.Scope1.1 This test method covers the thermal response of directthermal papers to determine uniformity
3、within and betweenlots.This test method may also be used to test direct thermalproducts other than paper.1.2 The Hobart 18VP Thermal Label Printer2described inthis test method may be used for specification acceptance,product development or research applications,or both,andmanufacturing control.1.3 A
4、lthough a specific manufacturer has been identified forthis equipment,any thermal label printer with equivalent signaloutput capabilities and sample size requirements would besuitable.1.4 The values stated in inch-pound units are to be regardedas the standard.The SI units given in parentheses,are fo
5、rinformation only.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 and health practices and determine the applica-bility of regulatory limitations prior to use.
6、(WarningThistest method requires making power adjustments and triggerprinting while the protective cover is off,thereby exposing theuser to electrical hazards.)2.Referenced Document2.1ANSI Standards:3IT 2.161995IT 2.1719953.Terminology3.1 Definitions of Terms Specific to This Standard:3.1.1 dynamic
7、thermal response curvethe graphical rep-resentation of the response characteristic of a thermal printingsystem over a given range of print energies.The y-axis of thegraph is optical density(reflectance density),while the x-axis iscalibrated in terms of print energy or energy density.Typicalunits for
8、 print energy are watts/dot or millijoules(mj),whereasthe units for print density are millijoules per square millimetre,mj/mm2.3.1.2 dynamic thermal sensitivitythe generation of thethermal response of thermal paper within a given printingsystem over a specific operating range of energy levels.4.Summ
9、ary of Practice4.1 This practice is intended to determine the dynamicthermal sensitivity of direct thermal papers.The energy versusimage density relationship obtained is a characterization of agiven coating and base paper.Curves can be used to determineuniformity within and between direct thermal pa
10、per lots.Thetest equipment and test procedures are not intended to simulatethermal response under actual end use conditions in a facsimilemachine.4.2 To determine the dynamic thermal sensitivity of directthermal facsimile,chart,or label papers,a 2.5 in.(6.35 cm)wide sample is fed into the printer(mi
11、nimum 11 in.(27.94 cm)length is suggested).4.3 A voltage controller on the power board allows theadjustment of the power to the thermal head(watts per dot).Voltage squared is a function of energy usually expressed inwatts/dot or millijoules(mj).4.4 The thermal response or density saturation curve ca
12、n beobtained by generating one of six available label patterns ontest samples using a range of energy levels.5.Significance and Use5.1 This test method enables dynamic thermal responsecomparisons between direct thermal papers.5.2 This test method makes comparisons between andwithin thermal paper pro
13、duction lots from the same manufac-turer.1This test method is under the jurisdiction ofASTM Committee F05 on BusinessImaging Products and is the direct responsibility of Subcommittee F05.06 onCarbonless and Thermal Imaging Products.Current edition approved Dec.1,2004.Published December 2004.Original
14、lyapproved in 1992.Last previous edition approved in 2000 as F 1444 00.2The sole source of supply of the apparatus known to the committee at this timeis Hobart Canada Inc.,Don Mills,Ontario,M3A 1B1.If you are aware ofalternative suppliers,please provide this information to ASTM InternationalHeadquar
15、ters.Your comments will receive careful consideration at a meeting of theresponsible technical committee1,which you may attend.3Available from American National Standards Institute,25 West 43rd St.,4thFloor,New York,NY 10036.1Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Consho
16、hocken,PA 19428-2959,United States.6.Interferences6.1 Widevariationsinenvironmentalconditions(temperature/RH)could impact the image density obtainedwith the use of this test method.6.2 The length of elapsed time following imaging andsubsequent image density measurements should be controlled.For best results,density measurements should be made within5 min of imaging.The exact time selected should remainconstant for all samples to be compared.6.3 Since the thermal facsimile papers are sensitive to
