1、Designation: D7804 12 (Reapproved 2017)Standard Test Method forFiber Shedding of Paint Roller Covers1This standard is issued under the fixed designation D7804; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last revisi
2、on. 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 describes a procedure for determiningthe amount of releasable fibers transferred from a paint rollercover to a s
3、urface being painted.1.2 This test method is applicable to pile fabric paint rollercovers.1.3 Because both the application and panel evaluation aresubjective, this test method should be used only for compara-tive testing within one facility using one operator for each setof applications, as the end
4、result assigned by different facilitiesmay not agree.1.4 The values stated in inch-pound units are to be regardedas standard. The values given in parentheses are mathematicalconversions to SI units that are provided for information onlyand are not considered standard.1.5 This standard does not purpo
5、rt 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. Some specifichazards statements are given in S
6、ection 7 on Hazards.1.6 This international 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
7、TechnicalBarriers to Trade (TBT) Committee.2. Summary of Test Method2.1 The paint roller cover that is to be evaluated is used topaint a section of sealed test paper. After the paint film hasdried, the fibers are counted.3. Significance and Use3.1 fibers that are released during painting can lead to
8、 afinish that is aesthetically unacceptable.4. Test Specimen4.1 Three identical paint roller covers, 9 by 1.5 in. (228.6 by38.1 mm) diameter core.5. Apparatus5.1 Paint Roller Framedesigned for the paint roller coverbeing tested.5.2 Paint Traysuitable for the paint roller cover beingtested.6. Materia
9、ls6.1 Test Paintcommercially available semi-gloss or glosspaint, identified as to type, product number, and color. Paint tobe mixed to a uniform consistency. Results may vary whenusing different paint types.6.2 Sealed Test Paperto minimize absorption of test paint,which allows formation of paint fil
10、m. Sections measuring 28in. (711.2 mm) wide by 20 in. (508 mm) long and have aminimum 10-mil thickness with a basis weight of 50 lb/Mft2(250 g/m2).6.3 Tack Clothcommercially prepared cloth designed toremove dust and lint.6.4 Lighted Magnifying Glasswith 5 magnification.7. Procedure7.1 All tests are
11、to be conducted in controlled environment.7.2 Prepare a clean, dry paint tray by wiping clean with atack cloth to remove all foreign material. Wipe paper surfaceand surrounding area with tack cloth also.7.3 Secure the two sections of sealed test paper to a flatvertical surface creating a 28 by 40 in
12、. (711.2 by 1.016 mm)test surface.7.4 Pour fresh paint into tray. Depth of paint to be the sameas the pile height of the paint roller covers being tested. Forexample,12 in. (12.7 mm) pile height cover would use12 in.(12.7 mm) of paint in tray. Do not use paint that has beenexposed to fibers.7.5 Plac
13、e the paint roller cover on the frame.7.6 Load the paint roller cover by using twenty back andforth strokes, ten strokes total that go into the paint tray well to1This test method is under the jurisdiction of ASTM Committee D01 on Paintand Related Coatings, Materials, and Applications and is the dir
14、ect responsibility ofSubcommittee D01.61 on Paint Application Tools.Current edition approved June 1, 2017. Published June 2017. Originallyapproved in 2012. Last previous edition approved in 2012 as D7804 12. DOI:10.1520/D7804-12R17.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, We
15、st 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 T
16、rade Organization Technical Barriers to Trade (TBT) Committee.1load the paint. Finish with four back and forth strokes, two totalstrokes that even out the paint on the ramp of the tray, notgoing into the paint well. The paint roller cover may requirehand rotation to achiever a uniform loading.7.7 Ro
17、ll out the paint roller cover on the sealed test paperusing the pattern shown in Fig. 1. Care should be taken tomaintain consistent light pressure on the paint roller coverduring the first eleven strokes. Finish with four lighter strokes,overlapping slightly.7.8 Cover as much of the test paper as po
18、ssible withoutcrossing the edges.7.9 Allow the test paper with paint to dry in a verticalposition to touch.7.10 Repeat procedure following instructions 7.1 7.9 twomore times on the remaining identical paint roller covers, beingsure to use fresh paint and new tray.7.11 Place painted test panel on a f
19、lat horizontal surface ina well-lighted area and wipe with a clean piece of tack cloth.7.12 Circle and count each fiber (only lint) that is observedin the dried paint film over the entire painted surface with amagnifying glass with 5 power and fluorescent light. Recordthe results. See Fig. 2 and Fig
20、. 3, magnified to show detail.7.13 The results will be recorded as number of fibers.8. Calculation or Interpretation of Results8.1 Average the three results obtained in 7.13.9. Precision and Bias29.1 The precision of this test method is based on aninterlaboratory study of D7804, Test Method for Fibe
21、r Shed-ding of Paint Roller Covers, conducted in 2006.3Sevenlaboratories participated in this project, testing two differenttypes of paint roller covers. Data from one laboratory could notbe used in the calculation of precision. Every “test result”represents an individual determination. The laborato
22、ries ob-tained three replicated test results for each material.9.1.1 RepeatabilityTwo test results obtained within onelaboratory shall be judged not equivalent if they differ by morethan the “r” value for that material; “r” is the intervalrepresenting the critical difference between two test results
23、 forthe same material, obtained by the same operator using thesame equipment on the same day in the same laboratory.9.1.2 ReproducibilityTwo test results shall be judged notequivalent if they differ by more than the “R” value for thatmaterial; “R” is the interval representing the difference be-tween
24、 two test results for the same material, obtained bydifferent operators using different equipment in different labo-ratories.9.1.3 Any judgment in accordance with these two state-ments would have an approximated 95 % probability of beingcorrect.9.2 BiasAt the time of the study, there was no accepted
25、reference material suitable for determining the bias for this testmethod, therefore not statement on bias is being made.9.3 The precision statement was determined through statis-tical examination of 36 results, from six laboratories, on twomaterials. The two materials can be classified as the follow
26、ing(Table 1):Roller cover Type 1: a roller with polyester fiber12 in.(12.7 mm) pile nap, contactor grade.Roller cover Type 2: a roller with polyester fiber12 in.(12.7 mm) pile nap, economy grade.9.3.1 To judge the equivalency of two test results, it isrecommended to choose a roller closest in charac
27、teristics to thetest roller.2Supporting data have been filed at ASTM International Headquarters and maybe obtained by requesting Research Report RR:D01-1164. ContactASTM CustomerService at serviceastm.org.3The sealed test paper used in the round robin was Leneta Company FormCU-1M.FIG. 1 Roll Out Str
28、oke PatternFIG. 2 Roller Fabric Lint Large FibersFIG. 3 Roller Fabric Lint Small FibersD7804 12 (2017)210. Keywords10.1 lint fiber; sheddingAPPENDIXES(Nonmandatory Information)X1. RATIONALEX1.1 Committee D01.61.2 has been meeting since 1998 andhas done updating to this procedure many times. Our grou
29、pconsists of people with the common interest of roller covershedding or linting. The round robins consisted of one rollercover manufacturer sending three roller covers processed asidentically as possible. Seven participants then painted with thesame lot of paint. Our biggest achievement came when we
30、 alljoined together and discovered how each were painting withdifferent techniques. Once we identified the techniques, theround robin efforts were acceptable. Differences in paintingtechnique made more difference than any other single factor,therefore it is vital that the same person paint the cover
31、s to betested. No preconditioning was considered in this testing as westrived to have “out of the package” results to duplicate thepainting application for most end users.X2. RESULTSX2.1 The results show that the precision of this test methodmay be unstable if the same person does not complete eacht
32、est.X2.2 The same cover cannot be painted more than one time.X2.3 Pressure exerted on the roller cover can alter theresults.X2.4 The person involved in testing should predeterminethe size of defect and the definition of lint.X2.5 Other factors that may alter results are materials andmanufacturing pr
33、ocesses.ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this standard. Users of this standard are expressly advised that determination of the validity of any such patent rights, and the riskof infringement of such rig
34、hts, are entirely their own responsibility.This standard is subject to revision at any time by the responsible technical committee and must be reviewed every five years andif not revised, either reapproved or withdrawn. Your comments are invited either for revision of this standard or for additional
35、 standardsand should be addressed to ASTM International Headquarters. Your comments will receive careful consideration at a meeting of theresponsible technical committee, which you may attend. If you feel that your comments have not received a fair hearing you shouldmake your views known to the ASTM
36、 Committee on Standards, at the address shown below.This standard is copyrighted by ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959,United States. Individual reprints (single or multiple copies) of this standard may be obtained by contacting ASTM at the above
37、address or at 610-832-9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org). Permission rights to photocopy the standard may also be secured from the Copyright Clearance Center, 222Rosewood Drive, Danvers, MA 01923, Tel: (978) 646-2600; http:/ 1 Lint CountAveragexRepeatabilityStandardDeviationsrReproducibilityStandardDeviationsRRepeatabilityLimitrReproducibilityLimitRRoller CoverType 1 38.9 12.8 22.2 35.7 62.1Type 2 139 51.3 115 144 322D7804 12 (2017)3
