1、Designation: D4147 99 (Reapproved 2013)D4147 18Standard Practice forApplying Coil Coatings Using The Wire-Wound DrawdownBarBars1This standard is issued under the fixed designation D4147; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revisi
2、on, 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 practice covers a procedure for applying a coil coating film of uniform thickness on a flat metal
3、 panel using thewire-wound drawdown bar.bars.1.2 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibilityof the user of this standard to establish appropriate safety safety, health, and healthenvironmental practices and determine
4、 theapplicability of regulatory limitations prior to use.1.3 This international standard was developed in accordance with internationally recognized principles on standardizationestablished in the Decision on Principles for the Development of International Standards, Guides and Recommendations issue
5、dby the World Trade Organization Technical Barriers to Trade (TBT) Committee.2. Summary of Practice2.1 A flat panel is secured on a firm horizontal surface. An ample amount of coating is poured across one end of the panel andthe drawdown bar placed behind the coating. The bar is then drawn with unif
6、orm pressure and speed along the length of the paneltoward the operator to apply a uniform film. The wet and dry film coating thickness obtained is dependent on the combination ofthe bar used, the volume solids of the coating, and the speed of the drawdown motion.3. Significance and Use3.1 This prac
7、tice is useful in the laboratory to simulate roll-coated films.4. Apparatus4.1 Wire-Wound Drawdown BarsA set of stainless steel wire-wound drawdown bars of sufficient diameter to prevent bowingduring application. These bars are manufactured so that the diameter of the wire wound on the bar controls
8、thickness of the wetfilm applied. The choice of specific drawdown bar is dependent on the dry film thickness required and the volume solids of thecoating under test. Each bar is provided a numeric identifier to help in selecting the correct bar to provide a specific dry filmthickness.4.2 Devices for
9、 Securing Panels:4.2.1 Magnetic Chuck for securing steel panels to eliminate bowing.4.2.2 Vacuum Plate for securing very lightweight nonmagnetic panels.4.2.3 Tape for securing the top of thin-gage panels.4.2.4 Mechanical Drives,Drives for securing panels and automating the drawdown procedure.5. Haza
10、rds5.1 The flash points of most solvents used in coatings and related products are low enough that adequate ventilation is neededto avoid exceeding 25 % of the lower explosive limits of the solvent when preparing and baking the panels. These solvents couldbe toxic, care should be taken to avoid inha
11、lation of the vapors and unnecessary contact of the solvents with the skin. Consult thecorresponding SDS for the specific coating to be applied for additional hazards.1 This practice is under the jurisdiction of ASTM Committee D01 on Paint and Related Coatings, Materials, and Applications and is the
12、 direct responsibility ofSubcommittee D01.53 on Coil Coated Metal.Current edition approved June 1, 2013Feb. 1, 2018. Published June 2013February 2018. Originally approved in 1982. Last previous edition approved in 20072013 asD4147 99 (2007)(2013).1. DOI: 10.1520/D4147-99R13.10.1520/D4147-18.This doc
13、ument is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Becauseit may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as
14、 appropriate. In all cases only the current versionof the standard as published by ASTM is to be considered the official document.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States16. Procedure6.1 Deburr panels so edges are smooth. Secur
15、e a flat panel to be coated on a firm, uniform, level surface. To provide sufficienttesting surface pour an ample amount of coating across the top end of the panel. Place the drawdown bar behind the coating andpull into the coating. Rotate the drawdown bar in the coating to ensure complete wetting o
16、f the coating in the threads of the bar.Apply uniform pressure across the contact length of the drawdown bar and hold it firmly without allowing rotation. Using onlyone pass, draw the bar along the length of and off the panel at a uniform speed and pressure so that a continuous film is produced.Appl
17、ication of the coating is dependent upon the rheology, type of coating, and speed and pressure to achieve the uniform desiredfilm. Remove the coated panel and bake, force dry, or air dry the coating in accordance with its type so its dry film thickness canbe measured. A heavier film thickness is may
18、 be obtained along the edges of the panel and possibly at the top of the panel wherethe coating was poured. For a two-coat system, each additional coating layer, the side edges must be trimmed to eliminate theheavier areas on the firstprevious coat before applying the secondan additional coat.7. Key
19、words7.1 coil coatings; drawdown barsASTM 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 ri
20、skof 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 reapproved or withdrawn.Your comments are invited either for revision of thi
21、s 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 you feel that your comments have not received a fair hearing you shouldmake
22、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. Individual reprints (single or multiple copies) of this standard may be obtained by
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