ASTM D6531-2000(2010) 5000 Standard Test Method for Relative Tinting Strength of Aqueous Ink Systems by Instrumental Measurement《仪器测量水基墨水的相对着色度的标准试验方法》.pdf
《ASTM D6531-2000(2010) 5000 Standard Test Method for Relative Tinting Strength of Aqueous Ink Systems by Instrumental Measurement《仪器测量水基墨水的相对着色度的标准试验方法》.pdf》由会员分享,可在线阅读,更多相关《ASTM D6531-2000(2010) 5000 Standard Test Method for Relative Tinting Strength of Aqueous Ink Systems by Instrumental Measurement《仪器测量水基墨水的相对着色度的标准试验方法》.pdf(3页珍藏版)》请在麦多课文档分享上搜索。
1、Designation: D6531 00 (Reapproved 2010)Standard Test Method forRelative Tinting Strength of Aqueous Ink Systems byInstrumental Measurement1This standard is issued under the fixed designation D6531; the number immediately following the designation indicates the year oforiginal adoption or, in the cas
2、e 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 procedure for determiningthe relative tinting strength of water
3、based ink systems using acomputer-aided spectrophotometer.1.2 This test method is applicable to waterbased printinginks and bases to be used primarily in flexographic and gravureprinting applications.1.3 This test method applies only to single, non-fluorescentpigmented colors and black ink systems f
4、or which there is areference standard containing a pigment of the identical colorindex name and number.1.4 The procedure in this test method specifies placingtinted samples in a cuvette for spectrophotometric measure-ments. The use of thick wet drawdowns as in Test MethodsD2066 are inappropriate due
5、 to severe floating problems withaqueous systems.1.5 The values stated in SI units are to be regarded asstandard. No other units of measurement are included in thisstandard.1.6 This standard does not purport to address all of thesafety concerns, if any, associated with its use. It is theresponsibili
6、ty of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations.2. Referenced Documents2.1 ASTM Standards:2D2066 Test Methods for Relative Tinting Strength of Paste-Type Printing Ink DispersionsD2244 Practice for Calcul
7、ation of Color Tolerances andColor Differences from Instrumentally Measured ColorCoordinatesE691 Practice for Conducting an Interlaboratory Study toDetermine the Precision of a Test MethodE1331 Test Method for Reflectance Factor and Color bySpectrophotometry Using Hemispherical GeometryE1347 Test Me
8、thod for Color and Color-Difference Mea-surement by Tristimulus ColorimetryE1349 Test Method for Reflectance Factor and Color bySpectrophotometry Using Bidirectional (45:0 or 0:45)Geometry3. Terminology3.1 Definitions related to color differences are covered inPractice D2244. The definitions of tint
9、ing strength terms aregiven in Test Methods D2066.4. Summary of Test Method4.1 A standard and unknown samples are each reduced tothe same concentration in a white tinting base then dispersedon a paint shaker.4.2 The dispersed samples are transferred to cuvettes forreflectance measurements on a spect
10、rophotometer. Hue andstrength relative to the standard tint are computed.NOTE 1The hue readings indicate the closeness of the unknownsample to that of the standard.5. Significance and Use5.1 Tinting strength is an essential property of printing inkdispersions. Although results on bulk tints do not g
11、uaranteeequivalency of dry printed films, they provide useful param-eters for quality control of production batches of bases andfinished inks. Test results may also be used for color matchingpurposes.6. Apparatus6.1 Glass Jars, capacity approx. 64 g, 33 mm in diameter by70 mm in height, with screw c
12、ap lids.6.2 Paint Shaker.6.3 Spectrophotometer, with small-area view (10-mm aper-ture, diffuse/8 geometry) and with a computer and software tomeasure reflectance factor, calculate color differences byCIELAB 1976 equation. Tinting strength is calculated by a1This test method is under the jurisdiction
13、 of ASTM Committee D01 on Paintand Related Coatings, Materials, andApplications and is the direct responsibility ofSubcommittee D01.56 on Printing Inks.Current edition approved Dec. 1, 2010. Published December 2010. Originallyapproved in 2000. Last previous edition approved in 2005 as D6531 00 (2005
14、).DOI: 10.1520/D6531-00R10.2For 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.1Copyright ASTM International, 100
15、 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.Kubelka-Monk equation transformed from the lowest tristimu-lus value. Alternate instrumentation and software may be usedby agreement between producer and user, or different plantlocations.6.4 Disposable Cuvettes, 10 mm
16、in diameter, with at leastone optically true face.6.5 Disposable Pipettes 7-mL capacity, 3.5-mL bulb drawor suitable substitute.6.6 Balance, capacity 100 g, accurate to 10 mg, preferably1 mg.6.7 Black Electrical Tape.6.8 Black Cover, 90 mm in diameter such as 1-lb ink can,with interior painted flat
17、black.6.9 Ink Knives, small.6.10 Medicine Droppers.7. Materials7.1 Standard Ink or BaseThe standard should be 100 %intended strength of the same pigmentation and similar inviscosity to the unknown sample.7.2 White Tinting Base, compatible with and of a viscositysimilar to samples being tested.8. Sam
18、pling8.1 Carefully select a sample that is free of skin and othercontamination. The minimum sample per test is 1.0 g of ink, or0.5 g of base.8.2 When ready to conduct the test, remove enough samplefor the test then reseal the container.9. Preparation of TintsNOTE 2Work quickly, as volatile loss duri
19、ng tint preparation may biastest results.9.1 Weigh approximately 25 g 6 1 g of white tinting baseand put into the jar. Record the weight to two decimal places.Coat the sides of the jar with the tinting base.9.2 Put the lid on the jar then tip and rotate the jar so that thesides are completely covere
20、d with the tinting base.9.3 Using a medicine dropper, weigh approximately 1 g 60.1 g of the unknown ink or 0.5 g 6 0.1g of test base into thejar. Record weight to two decimal points.9.4 Divide exact weight of ink by 0.02. The resultingnumber represents the total weight of sample plus tinting basefor
21、 a 2 % tint. Add tinting base accordingly. If the sample is abase, divide the exact weight by 0.01. Add tinting baseaccordingly to make a 1 % tint. In both cases, total weightshould be approximately 50 g. The amount of colorant shouldbe adjusted so that, at the wavelength of calculation, thereflecta
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