1、Designation: D 6737 01 (Reapproved 2006)Standard Test Method forBulk Density of Tapered Paintbrush Filaments1This standard is issued under the fixed designation D 6737; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of la
2、st 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 a procedure for measuring theweight of filaments per unit volume.1.2 This method is applicable
3、only to monofilament withtapered longitudinal profiles.1.3 The values given in SI units are to be regarded as thestandard. The values given in parentheses allow for calculatingthe bulk density in g/in.3, a commonly used form.1.4 This standard does not purport to address all of thesafety concerns, if
4、 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. Summary of Test Method2.1 The weight, length and diameter of a bundle of taperedfilamen
5、ts are measured, and the bundle density is calculated.3. Significance and Use3.1 Filaments are available in a variety of cross-sections andmaterials.Ameasure of bulk density permits the brushmaker toestimate the weight of filament required to prepare a givennumber of brushes.4. Apparatus4.1 The appa
6、ratus requires some machining, and is as-sembled as shown in Fig. 1 from the following equipment:4.1.1 Air Valve.24.1.2 Miniature Air Cylinder, dual acting, heavy duty.34.1.3 Assorted parts shown in Fig. 1 are machined from 304stainless steel and assembled as shown along with the air valveand cylind
7、er just described. The Pi tape4must be fixed in placeso that it reads accurately the diameter of a metal calibrationstandard that is 50.8-mm (2.00-in.) diameter.5The Pi tape ismounted on an adjustable plate for calibration.4.2 Weighing Device, accurate to 0.1 g to weigh the bundle.4.3 Graduated, Lin
8、ear Scale, accurate to 0.5-mm (0.02-in.)to measure the bundle length.4.4 Air Supply, with pressure regulator set for 40 psig.4.5 Calibration Standard, 50.8-mm (2.00-in.) in diameter.65. Sampling, Test Specimens and Test Units5.1 The test result depends on the cross-sectional shape, thepolymer, and t
9、he length of the bundle selected for the test. Toa lesser extent, it also depends on the filament diameter, sincethin filaments pack more efficiently than large ones.5.2 The device, as pictured in Fig. 1, is designed to measurediameters ranging from 30.5 to 52.3 mm (1.20 to 2.06 in.).Make sure that
10、both ends to be measured are within this range.5.3 Calculations are based on conical bundle shape.6. Procedure6.1 Select a sample bundle of approximately 50-mm (2.0-in.) diameter. Filament may be removed from a sample so thebundle diameter falls within the scale range 30.5 to 52.3-mm(1.20 to 2.06-in
11、.). One convenient method to adjust the samplediameter to the desired range is to fill a 50-mm (2.0-in.) insidediameter tube. If the sample is too small, like samples may becombined to adjust the bundle diameter to the desired range.6.2 With rubber bands holding the bundle together, roll itbetween t
12、he palms of the hands four times to allow thefilaments to nest. Place the larger end of the bundle inside theloop of measuring tape in the device shown in Fig. 2.6.3 Gently tap the top of the bundle to make certain that allfilaments are making contact with the bottom plate. The bundleshould be kept
13、perpendicular to the bottom plate. The rubberbands must be located where they do not interfere with themeasuring tape. Apply minimal downward pressure to restrainthe bundle from moving upwards during stabilization andtesting cycles. With the supply pressure to the air valve set at40 psig, operate th
14、e air valve lever 10 times with the bundle inplace to stabilize the system.Actuate the air valve to tighten the1This test method is under the jurisdiction of ASTM Committee D01 on Paintand Related Coatings, Materials, and Applications and is the direct responsibility ofSubcommittee D01.61 on Paint A
15、pplication Tools.Current edition approved Nov. 1, 2006. Published November 2006. Originallyapproved in 2001. Last previous edition approved in 2001 as D 6737 - 01.2Air valve such as Model 6676 available from Hunt Valve Co., 1913 E. StateStreet, Salem, Ohio 44460, or equivalent, has been found suitab
16、le for this purpose.3Miniature air cylinder such as Model 047 DXP,34 in. (19.0 mm) bore 7 in. (178mm) stroke, dual acting, heavy duty available from Bimba Manufacturing Company,Monee, IL 60449-0068, or equivalent, has been found suitable for this purpose.4Pi tape14 in. (6 mm) 3 6 ft (1.8 m) with 0.0
17、1 in. graduations. Lufkin modelW606P, or equivalent, has been found suitable for this purpose.5An assembled bulk density test device available from T.S. Simms density; filaments; paint brushASTM International takes no position respecting the validity of any patent rights asserted in connection with
18、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 rights, are entirely their own responsibility.This standard is subject to revision at any time by the responsible technic
19、al 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 standardsand should be addressed to ASTM International Headquarters. Your comments will receive careful consideration
20、 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 Committee on Standards, at the address shown below.This standard is copyrighted by ASTM International, 100 Barr Harbo
21、r 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 aboveaddress or at 610-832-9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org).FIG. 3 Tapered Bundle PlacementD 6737 01 (2006)3
