1、Designation: D7804 12Standard 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 revision. A number in pa
2、rentheses 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 surface being paint
3、ed.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 result assigned by
4、 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 purport to address all
5、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 Section 7 on Hazard
6、s.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 afinish that is aesthetically unacceptab
7、le.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. Materials6.1 Test Paintcommercially available se
8、mi-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 film. Sections measuring 28in. (711.2 mm) wi
9、de 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 to be conducted in controlled environment
10、.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. (711.2 by 1.016 mm)test surface.7.4 Pou
11、r 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 Place the paint roller cover on the frame.7.6
12、 Load the paint roller cover by using twenty back andforth strokes, ten strokes total that go into the paint tray well toload 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
13、 requirehand rotation to achiever a uniform loading.7.7 Roll out the paint roller cover on the sealed test paperusing the pattern shown in Fig. 1. Care should be taken to1This test method is under the jurisdiction of ASTM Committee on Paint andRelated Coatings, Materials, and Applications and is the
14、 direct responsibility ofSubcommittee D01.61 on Paint Application Tools.Current edition approved June 1, 2012. Published September 2012. DOI:10.1520/D7804-12.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States1maintain consistent light pr
15、essure 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 possible withoutcrossing the edges.7.9 Allow the test paper with paint to dry in a verticalposition to touch.7.10 Repeat procedure following i
16、nstructions 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 flat 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
17、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. 3, magnified to show detail.7.13 The results will be recorded as number of fibers.8. Calculation or Interpretation of Results8.1 Average t
18、he 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 Fiber Shed-ding of Paint Roller Covers, conducted in 2006.3Sevenlaboratories participated in this project, testing two differenttypes of paint r
19、oller covers. Data from one laboratory could notbe used in the calculation of precision. Every “test result”represents an individual determination. The laboratories ob-tained three replicated test results for each material.9.1.1 RepeatabilityTwo test results obtained within onelaboratory shall be ju
20、dged not equivalent if they differ by morethan the “r” value for that material; “r” is the intervalrepresenting the critical difference between two test results forthe same material, obtained by the same operator using thesame equipment on the same day in the same laboratory.9.1.2 ReproducibilityTwo
21、 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 two test results for the same material, obtained bydifferent operators using different equipment in different labo-ratories.9.1.3 Any judgm
22、ent 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 acceptedreference material suitable for determining the bias for this testmethod, therefore not statement on bias is being made.9.3 The precision st
23、atement was determined through statis-tical examination of 36 results, from six laboratories, on twomaterials. The two materials can be classified as the following(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
24、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 characteristics to thetest roller.10. Keywords10.1 lint fiber; shedding2Supporting data have been filed at ASTM International Headquarters and may
25、be obtained by requesting Research Report RR:D01-1164.3The sealed test paper used in the round robin was Leneta Company FormCU-1M.FIG. 1 Roll Out Stroke PatternFIG. 2 Roller Fabric Lint Large FibersFIG. 3 Roller Fabric Lint Small FibersD7804 122APPENDIXES(Nonmandatory Information)X1. RATIONALEX1.1 C
26、ommittee D01.61.2 has been meeting since 1998 andhas done updating to this procedure many times. Our groupconsists 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
27、possible. Seven participants then painted with thesame lot of paint. Our biggest achievement came when we alljoined together and discovered how each were painting withdifferent techniques. Once we identified the techniques, theround robin efforts were acceptable. Differences in paintingtechnique mad
28、e more difference than any other single factor,therefore it is vital that the same person paint the covers 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 resu
29、lts show that the precision of this test methodmay be unstable if the same person does not complete eachtest.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 defe
30、ct and the definition of lint.X2.5 Other factors that may alter results are materials andmanufacturing processes.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 advi
31、sed that determination of the validity of any such patent rights, and the riskof infringement of such rights, 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
32、reapproved or withdrawn. Your comments are invited either for revision of this standard or for additional 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
33、 you feel that your comments have not received a fair hearing you shouldmake your views known to the ASTM 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. Individ
34、ual reprints (single or multiple copies) of this standard may be obtained by contacting ASTM at the aboveaddress 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 ASTM website (www.astm.org/COPYRIGHT/).TABLE 1 Lint CountAveragexRepeatabilityStandardDeviationsrReproducibilityStandardDeviationsRRepeatabilityLimitrReproducibilityLimitRRoller CoverType 1 38.9 12.8 22.2 35.7 62.1Type 2 139 51.3 115 144 322D7804 123
