1、Designation: D 3708 88 (Reapproved 2005)An American National StandardStandard Test Method forWeight of Wax Applied During Curtain Coating Operation1This standard is issued under the fixed designation D 3708; the number immediately following the designation indicates the year oforiginal adoption or,
2、in the case of revision, the year of last 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 the determination of the weightof hot melt coating appli
3、ed to corrugated board by curtaincoating. It is intended to be used for routine process control inthe plant.NOTE 1Related methods for determining the weight of wax coatinginclude the following: Test Method D 3521; Test Method D 3522, and TestMethod D 3344.21.2 The values stated in SI units are to be
4、 regarded as thestandard. The values given in parentheses are for informationonly.1.3 This standard may involve hazardous materials, opera-tions, and equipment. This standard does not purport toaddress all of the safety problems associated with its use. It isthe responsibility of the user of this st
5、andard to establishappropriate safety and health practices and determine theapplicability of regulatory limitations prior to use.2. Referenced Documents2.1 ASTM Standards:D 3344 Test Method for Total Wax Content of CorrugatedPaperboard2D 3521 Test Method for Surface Wax Coating on Corru-gated Board2
6、D 3522 Test Method for Applied Coating Wax and Impreg-nating (Saturating) Wax in Corrugated Board Facing23. Terminology3.1 Definitions:3.1.1 wax loadingthe weight of wax present primarily asa surface film but including the minor part embedded in thesurface fibers of corrugated board. It is expressed
7、 as weight perunit area, usually in grams per square metre or pounds perthousand square feet of board.4. Summary of Test Method4.1 The amount of wax applied to corrugated board bymeans of a curtain coater is determined by attaching a foldedsheet of paper to production corrugated board, running theco
8、mbination through the curtain coater, and subsequentlydetermining the applied weight of wax on the sheet of paper.5. Significance and Use5.1 Wax coatings are applied to corrugated board to providea barrier against moisture or other penetrants or to provideimproved appearance or abrasion resistance.
9、These functionalproperties are influenced by the amount of wax present on thesurface.5.2 During curtain coating operations, major portions of thewax will congeal on the surface, while a minor portion willpenetrate and become embedded in the fibers of the facing.This method measures the total weight
10、of wax applied to theboard. The amount actually remaining on the surface of thecorrugated board can be determined by Test Method D 3521.5.3 The uniformity of application of wax film across thewidth of the curtain coater may also be determined using thistechnique by passing test combinations (blanks)
11、 under thecurtain at various locations, that is, left side, center, right side.6. Apparatus6.1 Sample Trimming EquipmentA suitable trimmingboard or template arrangement equipped with a razor edgeknife for even cutting of specimens to the required size withparallel edges.6.2 Measuring Rule, steel-edg
12、ed, for measuring the size ofspecimens to within 0.5 mm.6.3 Test PaperAny good quality typing bond with about25 % cotton fibers approximately 200 by 300 mm (812 by 11in.).6.4 Pressure-Sensitive Tape, to attach the test paper to thecorrugated carrier board.6.5 Carrier BoardProduction uncoated corruga
13、ted board,not less than 450 by 750 mm (18 by 30 in.). Die cut, slotted,and printed box blanks are acceptable.1This test method is under the jurisdiction of ASTM Committee D02 onPetroleum Products and Lubricants and is the direct responsibility of SubcommitteeD02.10 on Properties of Petroleum Wax.Cur
14、rent edition approved May 1, 2005. Published May 2005. Originallyapproved in 1978. Last previous edition approved in 2000 as D 3708 88 (2000).2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards vol
15、ume information, refer to the standards Document Summary page onthe ASTM website.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.6.6 Analytical Balance, capable of reproducing weighingsto the nearest 0.001 g.7. Sampling and Test Spec
16、imens7.1 Prepare test blanks by folding the 200 by 300-mm (812by 11-in.) sheets of the test paper in half in the 300-mmdimension. Assure that all folded edges are approximatelysuperimposed on each other. Crease the fold firmly with thefingers. Then place the folded sheet about in the center of asuit
17、able piece of corrugated carrier board and tape it firmly tothe board around its entire periphery with pressure-sensitiveadhesive tape.7.2 Prepare duplicate test blanks (carrier boards with at-tached folded sheets as described in 7.1) for each test unit.Prepare a supply of test blanks ahead of time
18、and keep themavailable at the machine for determining the amount of waxapplied.NOTE 2The test sheets do not require preconditioning since the paperis only a carrier for the wax, and variations are eliminated in the weighingprocedure.NOTE 3If the uniformity of application of wax film across the width
19、of the curtain coater is being checked, the folded test sheet can be placednear one of the side edges of the corrugated carrier board to cover themaximum width of curtain. In no case should the test sheet be placedcloser than 150 mm (6 in.) to either side edge of the carrier board.8. Procedure8.1 Pr
20、epare duplicate specimens by running test blanksprepared in 7.1 through the curtain coater in rapid succession.Pass the carrier board through the curtain such that the 450-mm(18-in.) dimension of the carrier board is at right angles to thecurtain.8.2 Place the two corrugated carrier boards with thei
21、r coatedtest specimens on a firm work table with the test specimensfacing upward. Cut out exact portions of the specimensmeasuring 100 by 100 mm, to the nearest 0.5 mm. Use atemplate and cut around the periphery of the template with arazor blade, ensuring that the cut passes cleanly through bothlaye
22、rs of folded paper. Each cut specimen consists, therefore,of a pair of 100 by 100-mm sheets, one having a wax surfaceand the other having no applied wax.8.3 Determine the weights of the waxed and the unwaxedsheets.9. Calculation9.1 For each specimen, record the following data andcalculations for the
23、 total wax coating:C 5 100 A 2 B! (1)where:A = weight of the waxed sheet (weight of paper plus weightof applied wax), g,B = weight of the unwaxed sheet, g, andC = applied wax coating, g/m2= 100 (A B)NOTE 4To convert from grams per square metre to pounds per 1000ft2multiply C 3 0.205.10. Report10.1 R
24、eport the weight of wax (average of duplicate speci-mens) in grams per square metre (lb/1000 ft2) as the total waxapplied by a curtain coater.11. Precision11.1 The precision of this test method as determined bystatistical examination of interlaboratory results is as follows:11.1.1 RepeatabilityThe d
25、ifference between two test re-sults, obtained by the same operator with the same apparatusunder constant operating conditions on identical test materialwould, in the long run, in the normal and correct operation ofthe test method, exceed 10 % of the mean only in one case intwenty.NOTE 5The repeatabi
26、lity data were obtained on test blanks to whichwax was applied by a curtain coater at 35 g/m2(7 lb/1000 ft2).11.1.2 ReproducibilityNot applicable.11.2 BiasThe procedure in this test method has no biasbecause the value of weight of wax applied can be defined onlyin terms of a test method.12. Keywords
27、12.1 curtain coating; weight of waxASTM 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 risk
28、of 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 this
29、 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 y
30、our 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 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).D 3708 88 (2005)2
