1、BRITISH STANDARDBS EN ISO8130-5:2010Coating powders Part 5: Determination of flow properties of a powder/airmixture (ISO 8130-5:1992) Incorporating corrigendum April 2011ICS 87.040National forewordThis British Standard is the UK implementation of EN ISO 8130-5:2010. It is identical to ISO 8130-5:199
2、2. It supersedes BS 3900-J9:1993 which is withdrawn.The UK participation in its preparation was entrusted to Technical Committee STI/10, Test methods for paints.A list of organizations represented on this committee can be obtained on request to its secretary.This publication does not purport to incl
3、ude all the necessary provisions of a contract. Users are responsible for its correct application.Compliance with a British Standard cannot confer immunity from legal obligations.BS EN ISO 8130-5:2010This British Standard, having been prepared under the direction of the Pigments, Paints and Varnishe
4、s Standards Policy Committee, was published under the authority of the Standards Board and comes into effect on 15 April 1993 BSI 2011The following BSI references relate to the work on this standard: Committee reference PVC/10 Draft for comment 91/52158 DCAmendments/corrigenda issued since publicati
5、onDate Comments 30 April 2011 This corrigendum renumbers BS 3900-J9:1993 as BS EN ISO 8130-5:2010ISBN 978 0 580 72113 7EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 8130-5 November 2010 ICS 87.040 English Version Coating powders - Part 5: Determination of flow properties of a powder/air m
6、ixture (ISO 8130-5:1992) Poudres pour revtement - Partie 5: Dtermination de laptitude la fluidisation dun mlange poudre/air (ISO 8130-5:1992) Pulverlacke - Teil 5: Bestimmung der Flieeigenschaften eines Pulver-Luft-Gemisches (ISO 8130-5:1992) This European Standard was approved by CEN on 16 October
7、2010. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtaine
8、d on application to the CEN Management Centre or to any CEN member. This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the CEN Managemen
9、t Centre has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands
10、, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: Avenue Marnix 17, B-1000 Brussels 2010 CEN All rights of exploitation in any
11、 form and by any means reserved worldwide for CEN national Members. Ref. No. EN ISO 8130-5:2010: EForeword The text of ISO 8130-5:1992 has been prepared by Technical Committee ISO/TC 35 “Paints and varnishes” of the International Organization for Standardization (ISO) and has been taken over as EN I
12、SO 8130-5:2010 by Technical Committee CEN/TC 139 “Paints and varnishes” the secretariat of which is held by DIN. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by May 2011, and conflicting national
13、standards shall be withdrawn at the latest by May 2011. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN and/or CENELEC shall not be held responsible for identifying any or all such patent rights. According to the CEN/CENELEC I
14、nternal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Lu
15、xembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. Endorsement notice The text of ISO 8130-5:1992 has been approved by CEN as a EN ISO 8130-5:2010 without any modification. BS EN ISO 8130-5:2010EN ISO 8130-5:2010 (E
16、) BSI 2011 11 ScopeThis part of ISO8130 specifies a method for determining the flow properties of a mixture of coating powder and air. The method reflects commercial practice in powder spraying (see“Bibliography”, Annex B).The results obtained are influenced by the composition of the coating powder,
17、 its density, particle size distribution and particle shape, together with the tendency of the particles to agglomerate and to accept a triboelectric charge.NOTE 1It is well known that the transport and spraying characteristics of powders are highly dependent on their flow properties in bulk and in
18、air. The procedure described in this method is considered to be more meaningful than the “flow angle” approach sometimes used to evaluate bulk flow properties. In the latter, the angle of the cone formed when a powder is allowed to flow through a vertical funnel on to a horizontal surface is measure
19、d. A given mass of powder with good flow properties forms a shallower cone than an equal mass of a powder with poorer flow. The objections to the flow angle method are that it is difficult to obtain a precise measurement and that the powder is used alone, whereas during application it is mixed with
20、air.2 Normative referenceThe following standard contains provisions which, through reference in this text, constitute provisions of this part of ISO8130. At the time of publication, the edition indicated was valid. All standards are subject to revision, and parties to agreements based on this part o
21、f ISO8130 are encouraged to investigate the possibility of applying the most recent edition of the standard indicated below. Members of IEC and ISO maintain registers of currently valid International Standards.ISO 8130-9:1992, Coating powders Part9:Sampling. 3 PrincipleUnder draught-free conditions,
22、 a specified quantity of coating powder is placed in a vessel and is fluidized with clean dry air under standard conditions of atmospheric temperature and pressure. The height of the powder during and after fluidization is measured and the rate at which the fluidized powder flows through a specified
23、 orifice is then determined.The measurements are used to calculate the fluidization factor and the powder flow rate (flow factor) R which together define the transport and spraying characteristics of the powder.4 Apparatus4.1 Apparatus for the determination of flow properties, consisting of a fluidi
24、zation vessel with a circular opening in the wall and a device for measuring the height of powder in the vessel. A means for weighing the amount of powder that flows through the opening is also included.NOTE 2A suitable apparatus is shown in Figure 1 and described below. Other apparatus may be used
25、if it gives comparable results.A typical apparatus consists of the elements described in4.1.1 to4.1.3.4.1.1 Vessel for fluidizing the powder (vessel A), outer diameter approximately110mm, inner diameter approximately100mm, height not less than approximately200mm, made of transparent poly(methyl meth
26、acrylate) and having a bottom made of a sintered-bronze disc of uniform porosity and a maximum pore size of approximately404m diameter.NOTE 3A disc of 5mm thickness capable of passing air at a rate of approximately (200 10)l/h under a pressure of5kPa above atmospheric has been found to be satisfacto
27、ry.A 4-mm-diameter circular opening D that can be closed with stopper E shall be situated in the wall of the vessel,10mm above the top of the porous disc.4.1.2 Air regulation unit B, with flowmeter F for adjusting the air flow.4.1.3 Container C, sufficiently large to collect the powder discharged du
28、ring measurement of the powder flow rate (seeFigure 1).4.2 Supply of clean dry air, sufficient to undertake the test.BS EN ISO 8130-5:2010EN ISO 8130-5:2010 (E)2 BSI 20114.3 Timer, accurate to 1s.4.4 Analytical balance, of capacity500g, capable of weighing to0,1g.4.5 Device for measuring the height
29、of the powder in vessel A, graduated in millimetres.4.6 Spatula5 SamplingTake a representative sample of the product to be tested, as described inISO8130-9.The quantity of the sample shall be sufficient for three determinations (see7.3).NOTE 4A sample of 1 kg is recommended.6 Procedure6.1 Calibratio
30、n of apparatusCalibrate the apparatus at a temperature of23C and an air pressure of101,3kPa (1013mbar) (seeAnnex A for guidance).6.2 Determination of flow propertiesCarry out the determination in duplicate.Close opening D with stopper E and charge vessel A with (250 10)g of the coating-powder sample
31、.Figure 1 Example of an apparatus for the determination of flow properties (forillustrativepurposes only)BS EN ISO 8130-5:2010EN ISO 8130-5:2010 (E) BSI 2011 3Introduce clean dry air (4.2) through the porous bottom at a rate sufficient to achieve optimum fluidization of the powder, normally (200 10)
32、l/h. Note the air flow rate as measured on the flow meter F. To prevent “channelling” and “bubbling” during fluidizing, stir the powder with the spatula (4.6) until the height of the bed remains constant between stirrings.NOTE 5This takes about1min to2min.If optimum fluidization takes place at air f
33、low rates outside the range190l/h to200l/h, use the appropriate air flow rate.NOTE 6Direct comparison of the performance of powder fluidized at different air flow rates may not be valid.Measure the height h1 of the fluidized bed to an accuracy of2mm. Switch off the air and allow the powder to settle
34、 (this may require1 min to2min). Measure to within2mm the height h0 of the powder at rest.Fluidize the powder again at the same rate of air supply, assist fluidizing by stirring and wait until the fluidized powder bed has reached a constant level. Remove stopper E from opening D, starting the timer
35、(4.3) at the same time, and collect the powder discharged through the opening during(30 1)s. Close opening D with stopper E. Weigh the collected powder (m) to the nearest0,1g.7 Expression of results7.1 Calculate the fluidization factor , using the equationwhere7.2 Calculate the powder flow rate R, i
36、n grams, using the equationR = mwhere7.3 If the results differ by less than5% of the lower value, calculate the arithmetic mean of and R. If the difference between the two results exceeds5%, carry out a third determination and calculate the arithmetic mean of all three results. If the difference bet
37、ween the result of the third determination and those of the other determinations is greater than5%, state this and the individual results in the test report.8 Test reportThe test report shall contain at least the following information:a) all details necessary to identify the product tested;b) a refe
38、rence to this part of ISO8130 (ISO8130-5);c) the temperature and pressure of the air in the test room;d) the air flow rate;e) an indication of irregularities in the fluidized bed (such as “channelling” or “bubbling”), if observed;f) the results of the test as indicated in7.3;g) any deviation from th
39、e test method specified;h) the date of the test.h0 is the height, in millimetres, of the powder at rest;h1 is the height, in millimetres, of the fluidized powder bed. h1h0-=m is the mass, in grams, of powder collected in container C; is as given in7.1.BS EN ISO 8130-5:2010EN ISO 8130-5:2010 (E)4 BSI
40、 2011Annex A (informative) Notes on apparatus and procedureA.1 Construction of apparatusTo prevent cleaning difficulties and/or clogging of the sintered-bronze bottom, it is strongly recommended that the air entrance compartment G (below the porous bottom of vessel A) be removable (for example by a
41、screw mechanism).A.2 CorrectionsUsually flow meter F is calibrated with air under standard conditions of temperature and pressure. Mostly, however, it is used under other conditions, so it is necessary to make corrections to obtain the real flow rate of200l/h. IfC is the correction factor and qr the
42、 required flow rate e.g. (200 10)l/h as given in6.2, then the flow meter reading qf is given by:This correction factor C (= C1C2) depends ona) the difference in air pressure during the calibration and during the test:whereb) the difference in the absolute temperature of the air during the calibratio
43、n and during the test:whereA.3 ExampleA test is carried out using a flow meter that has been calibrated in litres of air per hour at23C and101,3kPa (1013mbar).If the test is carried out at15C and120kPa(1200mbar), the following calculations can be used to determine the reading on the flow meter which
44、 will obtain a real flow rate of200l/h:ThusTo obtain a real flow rate of200l/h under the conditions of the test, the flow meter should therefore be adjusted to181l/h.Annex B (informative) Bibliography1 DOUMA, G.H. and SELIER, P. I-Lack, 41, No.9, p.361 (1973).2 DE LANGE, P.G. I-Lack, 42, No. 9, p. 3
45、39 (1974).p1 is the air pressure, in kilopascals, during the calibration,p2 is the air pressure, in kilopascals, during the test;qf qrC-=T1 is the temperature, in kelvins, of the air during the calibration,T2 is the temperature, in kelvins, of the air during the test.BS EN ISO 8130-5:2010EN ISO 8130
46、-5:2010 (E) BSI 2011List of referencesSee national foreword.BS EN ISO 8130-5:2010EN ISO 8130-5:2010 (E)BSI GroupHeadquarters 389 Chiswick High Road, London, W4 4AL, UK Tel +44 (0)20 8996 9001 Fax +44 (0)20 8996 7001 standardsBSI - British Standards InstitutionBSI is the independent national body re
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