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1、BRITISH STANDARD BS 5752-10: 1986 ISO 7532:1985 Methods of test for Coffee and coffee products Part 10: Instant coffee: size analysis UDC 633.73 + 663.93:620.113 Licensed Copy: sheffieldun sheffieldun, na, Mon Dec 04 14:58:15 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 5752-10:1986 This British St
2、andard, having been prepared under the direction of the Food and Agriculture Standards Committee, was published under the authority of the Board of BSI and comes into effect on 30 April 1986 BSI 01-2000 The following BSI references relate to the work on this standard: Committee reference FAC/15 Draf
3、t for comment 84/54004 DC ISBN 0 580 15150 6 Committees responsible for this British Standard The preparation of this British Standard was entrusted by the Food and Agriculture Standards Committee (FAC/-) to Technical Committee FAC/15 upon which the following bodies were represented: Association of
4、Public Analysts British Soluble Coffee Manufacturers Association Coffee Trade Federation Ltd. Department of Trade and Industry (Laboratory of the Government Chemist) Food Manufacturers Federation Incorporated Institute of Trading Standards Administration Ministry of Agriculture, Fisheries and Food O
5、verseas Development Administration (Tropical Development and Research Institute) Amendments issued since publication Amd. No.Date of issueComments Licensed Copy: sheffieldun sheffieldun, na, Mon Dec 04 14:58:15 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 5752-10:1986 BSI 01-2000i Contents Page Com
6、mittees responsibleInside front cover National forewordii 1Scope and field of application1 2References1 3Definitions1 4Principle1 5Apparatus1 6Sampling1 7Procedure1 8Expression of results2 9Test report2 Table Nominal sizes of openings1 Publications referred toInside back cover Licensed Copy: sheffie
7、ldun sheffieldun, na, Mon Dec 04 14:58:15 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 5752-10:1986 ii BSI 01-2000 National foreword This Part of BS 5752 has been prepared under the direction of the Food and Agriculture Standards Committee. It is identical with ISO 7532:1985 “Instant coffee size an
8、alysis” published by the International Organization for Standardization (ISO). This Part embodies an agreement, to which the UK was a party, reached in Subcommittee 15, Coffee, of Technical Committee 34, Agricultural food products, of ISO. Terminology and conventions. The text of the International S
9、tandard has been approved as suitable for publication as a British Standard without deviation. Some terminology and certain conventions are not identical with those used in British Standards; attention is drawn especially to the following. The comma has been used throughout as a decimal marker. In B
10、ritish Standards it is current practice to use a full point on the baseline as the decimal marker. Wherever the words “International Standard” appear, referring to this standard, they should be read as “British Standard”. There are no corresponding British Standards for ISO 2591:1973 and ISO 3310-1:
11、1975. The Technical Committee has reviewed the provisions of these standards and has decided that they are acceptable for use in conjunction with this standard. Related British Standards for ISO 2591:1973 and ISO 3310-1:1982 are BS 1796:1976 “Method for test sieving” and BS 410:1986 “Specification f
12、or test sieves”, respectively. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Cross-refe
13、rences International StandardCorresponding British Standard ISO 3509:1984BS 5456:1985 Glossary of terms relating to coffee and its products (Identical) ISO 6670:1983BS 6379 Sampling of coffee and coffee products Part 2:1984 Methods of sampling instant coffee in cases with liners (Identical) Summary
14、of pages This document comprises a front cover, an inside front cover, pages i and ii, pages 1 and 2, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front
15、 cover. Licensed Copy: sheffieldun sheffieldun, na, Mon Dec 04 14:58:15 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 5752-10:1986 BSI 01-20001 1 Scope and field of application This International Standard specifies a method for the determination of the particle size (screen) analysis of instant coff
16、ee, by manual or mechanical sieving, using test sieves. 2 References ISO 2591, Test sieving. ISO 3310-1, Test sieves Technical requirements and testing Part 1: Test sieves of metal wire cloth. ISO 3509, Coffee and its products Vocabulary. ISO 6670, Instant coffee in cases with liners Sampling. 3 Def
17、initions For the purpose of this International Standard, the definitions of ISO 3509 apply. 4 Principle Separation of a test portion into fractions according to particle size, by manual or mechanical sieving, and expression of results as percentages by mass. 5 Apparatus Usual laboratory apparatus, a
18、nd in particular 5.1 Nest of test sieves, of diameter 200 mm, conforming to ISO 2591 and ISO 3310-1, together with a cover lid and receptacle pan. These sieves should be taken from one of the two series shown in the Table, preferably the R 20/3 series. Table Nominal sizes of openings 5.2 Balance, ac
19、curate to 0,1 g. 5.3 Brush, with soft hairs. 5.4 Mechanical shaker (as required), reproducing approximately the manual motion described in 7.3. 6 Sampling See ISO 6670. 7 Procedure WARNING On account of the hygroscopic character of instant coffee, the determination should not be carried out in a hum
20、id atmosphere, for example higher than 60 % relative humidity. The use of an effective dehumidification unit is therefore recommended. 7.1 Choice of sieves In the case of spray-dried instant coffee, choose a nest of four or five sieves from those with smaller sizes of openings, preferably in the R 2
21、0/3 series or the selected sizes from the R 40/3 series (see the Table). In the case of freeze-dried or agglomerated instant coffee, choose a nest of four or five sieves from those with larger sizes of openings, preferably in the R 20/3 series or the selected sizes from the R 40/3 series (see the Ta
22、ble). Nest the sieves and place the receptacle pan under the sieve having the smallest size of openings. 7.2 Test portion Weigh, to the nearest 0,1 g, approximately 100 g of the laboratory sample. 7.3 Sieving and weighing Pour the test portion (7.2) uniformly on the top sieve, and place the cover li
23、d in position. Agitate using both hands for 5 min, effecting a horizontal movement of amplitude 70 mm at a rate of 120 times per minute (60 times to and fro). It is also possible to use a mechanical shaker (5.4) reproducing approximately the movement described. Separate the sieves one after the othe
24、r, taking care, with the aid of a brush, to recover the instant coffee adhering to the underside of each mesh by transferring it to the coffee retained on the sieve (or pan) below. Subsequently weigh, to the nearest 0,1 g, the fraction remaining on each sieve used, and in the receptacle pan. 7.4 Num
25、ber of determinations Carry out at least two determinations on test portions of 100 g, taken from the same laboratory sample. R 20/3 series Selected sizes from the R 40/3 series 4m4m 4 000 2 800 2 000 1 400 1 000 710 500 355 250 180 125 3 350 2 360 1 700 1 180 850 600 425 300 212 150 Licensed Copy:
26、sheffieldun sheffieldun, na, Mon Dec 04 14:58:15 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 5752-10:1986 2 BSI 01-2000 8 Expression of results 8.1 For each test, express the result as a percentage by mass, in the following manner: 8.2 For each test, the total of the percentages shall be 100 1 %;
27、if not, repeat the entire procedure using new test portions. 8.3 Take as the result, for each sieve and for the receptacle pan, the mean of the results of the determinations (7.4), and express as indicated previously, provided that the condition of 8.2 is fulfilled. 8.4 It is also useful to plot a g
28、raph of cumulative results as a function of the size of openings in order to determine the size of openings corresponding to a cumulative percentage of 50 %. 9 Test report The test report shall show the method, the mode of sieving (manual or mechanical), indicating in the last case the type of equip
29、ment used, and the results obtained. It shall also mention all the operating details not specified in this International Standard, or regarded as optional, as well as any incidents that may have influenced the result. The report shall give all the information necessary for the complete identificatio
30、n of the sample. ON (oversize or residue) (for each of the sieves used in the test). . . % (m/m) THROUGH (undersize or fines) (for the sieve of smallest aperture size used, into the receptacle pan). . . % (m/m) Licensed Copy: sheffieldun sheffieldun, na, Mon Dec 04 14:58:15 GMT+00:00 2006, Uncontrol
31、led Copy, (c) BSI BS 5752-10:1986 BSI 01-2000 Publications referred to See national foreword. Licensed Copy: sheffieldun sheffieldun, na, Mon Dec 04 14:58:15 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 5752-10: 1986 ISO 7532:1985 BSI 389 Chiswick High Road London W4 4AL BSI British Standards Insti
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