1、Designation: D3076 00 (Reapproved 2010)D3076 18Standard Test Methods Practice forEffective Crimping on Outside Crimped Valves of AerosolContainers1This standard is issued under the fixed designation D3076; the number immediately following the designation indicates the year oforiginal adoption or, in
2、 the case of revision, 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 These test methods cover This practice covers the effective crimping on outside cri
3、mped valves within the wide parametersof containers and valves available.1.2 The test methods Practices appear in the following order:SectionsOptical Comparator Test Method 4 to 7Optical Comparator Practice 4 to 7Caliper Test Method 8 to 12Caliper Practice 8 to 121.3 The values stated in SI units ar
4、e to be regarded as standard. No other units of measurement are included in this standard.1.4 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, an
5、d healthenvironmental practices and determine theapplicability of regulatory limitations prior to use.1.5 This international standard was developed in accordance with internationally recognized principles on standardizationestablished in the Decision on Principles for the Development of Internationa
6、l Standards, Guides and Recommendations issuedby the World Trade Organization Technical Barriers to Trade (TBT) Committee.2. Referenced Documents2.1 ASTM Standards:2D996 Terminology of Packaging and Distribution EnvironmentsD3064 Terminology Relating to Aerosol Products3. Terminology3.1 General defi
7、nitions for packaging and distribution environments are found in Terminology D996.3.2 General definitions of terms relating to aerosol products are found in D3064.OPTICAL COMPARATOR TEST METHODOPTICAL COMPARATOR PRACTICE4. Summary of Test MethodPractice4.1 This test method practice involves drawing
8、a projected, enlarged profile of the container and valve, then removing the valveand drawing the projected profile of the container finish. Measuring the resultant void and subtracting the dimensions of theessentially noncompressed components from this value results in the value representing the com
9、pressed thickness of the valvesealing gasket.5. Significance and Use5.1 This test method practice provides information for the establishment of quality control procedures on filling lines.1 These test methods are This practice is under the jurisdiction of ASTM Committee D10 on Packaging and are the
10、direct responsibility of Subcommittee D10.33 onMechanical DispensersAerosol Products. These test methods were This practice was originally developed by the Chemical Specialties Manufacturers Assn.Current edition approved Oct. 1, 2010May 1, 2018. Published November 2010June 2018. Originally approved
11、in 1972. Last previous edition approved in 20052010 asD3076 00 (2005).(2010). DOI: 10.1520/D3076-00R10.10.1520/D3076-18.2 For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM Customer Service at serviceastm.org. For Annual Book of ASTM Standardsvolume information, refer
12、to the standards Document Summary page on the ASTM website.This document 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 chang
13、es accurately, ASTM recommends that users consult prior editions as 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. Uni
14、ted States16. Apparatus6.1 Optical Comparator.6.2 Clamping Jig, fastened to the comparator bench.6.3 Grinder, electric, small enough to be hand held.7. Procedure7.1 Crimp a valve on an empty bottle with the line crimper set at normal operation, and clamp the bottle in the jig on thecomparator bench.
15、7.2 Draw the projected, enlarged image on tracing paper.NOTE 1Grid ruled tracing paper makes the tracing much easier.7.3 Without disturbing the paper or bottle, cut a wedge out of the valve with the electric grinder, and remove the valve.7.4 Trace the projected image of the container alone on the sa
16、me paper.7.5 Measure the void between the two silhouettes (Fig. 1 and Fig. 2). Subtract the dimensions (multiplied by the enlargementfactor of the essentially uncompressed components of the valve) from this value to obtain the thickness of the compressed gasketmultipled by the enlargement factor, an
17、d convert this reading into percent compression.CALIPER TEST METHODCALIPER PRACTICE8. Summary of Test MethodPractice8.1 This test method practice involves a measurement of the height of the uncrimped portion of the valve. The points betweenwhich the measurement is made are self-determining when the
18、calipers are held parallel to the side of the valve. Mean dimensionsare used in calculating the effective crimp height.9. Significance and Use9.1 This test method practice provides information for the establishment of quality control procedures on filling lines.10. Apparatus10.1 Calipers, vernier or
19、 dial.11. Procedure11.1 Select a filled bottle from the filling line at random.11.2 Mark off three points, 120 apart, on the valve ferrule, carefully avoiding areas where stake marks occur.11.3 Holding the calipers parallel to the side of the valve, place the inner jaw on the top of the valve.Apoint
20、s between which effective crimp height measurement should be made (these points are self-determining when the calipers are held parallel to the side of thevalve).Bpoints between which a relative measurement may be established for nondestructure quality control use from optical comparator data.Ceffec
21、tive compression.Dflat compression.FIG. 1 Effective Crimp HeightD3076 18211.4 Slide the outer jaw up the valve skirt until it stops, due to the abrupt directional change in the skirt.11.4.1 In collect-crimped bottles a line appears at the top of the crimped skirt area. This is made by the top of the
22、 collectsegment, and is the point at which direction changes abruptly and the caliper will hang up.11.4.2 Roll-capped bottles will also produce this horizontal line at the top of the crimped area. Depending upon the facialcontour of the rollers, this line may be above or at the point of abrupt direc
23、tion change. Letting the caliper find the point of directionchange naturally, will eliminate doubt about this measurement.11.5 Repeat this process at the other locations marked on the ferrule.11.6 Record a reasonable agreement between any two readings as the effective crimp height (Fig. 1).11.7 Meas
24、ure the diameter of the uncrimped portion of the valve. Subtract the diameter of the crimped valve skirt from thediameter of the uncrimped portion of the valve. Record this value as the crimp diameter.12. Calculation12.1 Calculate the maximum crimp height for effective crimping, M (which needs to be
25、 determined only once for any bottle andvalve combination), as follows:M 5A1B/2!1C12Dwhere:A = dimension of the bottle lip (excluding the sealing bead),B = thickness of the sealing gasket,C = thickness of the valve body flang (excluding the sealing bead), andD = thickness of the valve ferrule.12.2 W
26、hen plastic-coated bottles are used, add 0.015 to the end of the equation in 12.1 to compensate for the nominal amountof plastic expected to be present under the lip of the bottle finish.13. Precision and Bias13.1 PrecisionThe precision of Test Methods Practice D3076 is highly dependent on the type
27、of can and aerosol valve beingtested. While inside-crimped aerosol valves can operate within a standard dimensional target, such a single target cannot be readilyobtained for outside-crimped aerosol valves. This is due to the wide tolerances of the containers and the tolerances of the valvecomponent
28、s (especially the rubber gasket) utilized in the industry. One laboratory has investigated one aerosol valve/aluminum cancombination with two replicate tests, yielding the following results:Can # Crimp Measurement (mm)1 5,162 5,23 5,264 5,45 5,36 5,357 5,258 5,27Arepresentation of a plastic-coated b
29、ottle.Brepresentation of an uncoated bottle.NOTE 1A and B represent points between which measurements should be made after drawing the projected profiles.FIG. 2 Optical Comparator ProfileD3076 1839 5,2210 5,311 5,3412 5,3513 5,3114 5,3615 5,3516 5,3117 5,3418 5,2619 5,320 5,25Mean Value 5,29Standard
30、 Deviation 0,06Max Value 5,35Min Value 5,1613.1.1 Other aerosol packages may have values different than the values disclosed in 13.1. Users of this test method practiceare suggested to reference historical files of previous tests of similar aerosol packaging for an estimate of within-laboratoryrepea
31、tability. The Committee believes that because of this strong product and component material dependency, furtherinvestigation of repeatability and reproducibility is not practicable.13.2 Test Methods Practice D3076 has no bias because an accepted reference or referee value is not available.14. Keywor
32、ds14.1 aerosol packaging; crimp measurement of aerosol valves; outside-crimped aerosol valvesAPPENDIX(Nonmandatory Information)X1. DISCUSSIONX1.1 Analyzing the similarities and differences between effective sealing of inside crimped valves and outside crimped valves, itbecomes readily apparent that
33、the main factor to consider for effective sealing in both cases is compression of the sealing memberof the valve.X1.2 Where a standard dimension is offered to the trade for inside crimped valves, such a single dimension or dimension rangecannot readily be obtained for outside crimped valves, due to
34、wide tolerances on the essential dimensions of glass containers andthe wide variation between valves offered to the trade for glass aerosol containers.X1.2.1 In spite of this situation, the possibility of establishing crimping dimensions is not eliminated, but it becomes a little moreinvolved insofa
35、r as separate dimensions must be established for each valve-container combination.X1.3 Mean dimensions were chosen for the caliper method formula to give approximately 20 % compression of the rubber gasketon the maximum bottle. Using the same crimper adjustment, a minimum bottle can produce a neglig
36、ible flat compression, but willstill have approximately 30 % effective compression even though the glass sealing bead is non-existent.X1.3.1 In calculating compression of the rubber gasket, it is recommended that the sealing beads on both the glass and valve bodyflange be ignored to provide a small
37、safety factor.X1.4 Serum vial type crimping, where the valve does not display a crimped skirt, cannot easily be measured by means of thecalipers alone.An effective crimp height setting should be established by the optical comparator and a relative height measurement(by calipers) can be determined fr
38、om the setting that produces an acceptable compression as determined by the comparator. Thisrelative height can then be used nondestructively by quality control personnel on the filling lines to determine effective crimping.X1.5 Minimum values for crimp diameter (that is, 0.060 for 20-mm valves and
39、0.030 for 15-mm valves) are those that an effectivecrimped valve requires pressures of over 400 psi (2.7 MPa) to exert sufficient force to unseat a 20-mm valve and over 500 psi (3.4MPa) to unseat a 15-mm valve. In any case, it is desirable to press the skirt firmly against the side of the bottle for
40、 appearancesD3076 184and to prevent valve popping upon bottle breakage.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
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