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1、INTERNATIONAL STANDARD INTERNATIONAL ORGANIZATION FOR STANDARDIZATION ORGANISATION INTERNATIONALE DE NORMALISATION ME)KAYHAPOflHAR OPTAHM3AMR fl0 CTAHAPTM3AYMM lnstant coffee - Determination of free-flow and compacted bulk densities Cafh soluble - Determination de Ia masse vofumique sans tassement e
2、t apr b) compacted bulk density (section two). 2 References ISO 787-11, General methods of test for Pigments and extenders - Part 17 : Determination of tamped volume and apparen t density a ftei tamping. ISO 6670, Soluble coffee in cases with Jiners - Sampling. Copyright International Organization f
3、or Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/23/2007 22:32:33 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO 8460 : 1987 (E) 3 Definition For the purposes definition applies. Section one : D
4、etermination of free-flow bulk density of this International Standard, the following free-flow bulk density (of instant coffee) : The ratio of the mass of instant coffee to the volume it occupies (mass per unit volume) after it has been poured freely into a receptacle under the conditions specified
5、in this International Standard. lt is conventionally expressed in grams per millilitre. 4 Principle Pouring a Sample through a specified funnel into a specified receptacle of known volume and weighing the contents of the receptacle. 5 Apparatus 5.1 Balance, accurate to 0,l g. 5.2 Apparatus for deter
6、mination of free-flow bulk den- sity, having the dimensions shown in figure 1 and the arrange- ment shown in figure 2, and consisting of the following Parts. 5.2.1 Funnel, made of stainless steel, firmly mounted on a support attached to a rigid base. The exact dimensions shall conform to those given
7、 in figure 1. 5.2.2 Measuring receptacle, cylindrical, steel, of approximate capacity 205 ml. made of stainless The capacity of the receptacle shall be known to the nearest millilitre. The exact dimensions shall conform to those given in figure 1. The 1 distance between the bottom of the funnel and
8、the top of the receptacle shall be kept constant at 40,O + 1,5 mm. 53 e;lge. Spatula, or other suitable implement having a straight 6 Sampling See ISO 6670, in particular annex B. 7 Procedure WARNING - On account of the hygroscopic Character of instant coffee, the determination should not be carried
9、 out in a humid atmosphere, for example higher than 60 % relative humidity. The use of an effective dehumidifica- tion unit is therefore recommended. 2 7.1 Weigh the measuring receptacle (5.2.2) to the nearest 0,l g. Pour the laboratory Sample from its Container into the funnel (5.24, allowing it to
10、 flow freely into the measuring receptacle (5.2.2) until the latter overflows. Remove the excess instant coffee, using the spatula or other suitable implement (5.3) to form a plane surface level with the top of the measuring receptacle. Avoid moving, shaking or vibrating the measuring receptacle bef
11、ore the excess instant coffee has been removed. Remove the measuring receptacle and weigh the measuring receptacle and its contents to the nearest 0,l g. 7.2 Carry out two determinations on the same laboratory Sample or on two different Iaboratory samples if the size of the laboratory Sample availab
12、le is insufficient to carry out two separate determinations. 8 Expression of results 8.1 Method of calculation and formula The free-flow bulk density, expressed in grams per millilitre, is equal to m2 - ml V where rnl is the mass, in grams, of the measuring receptacle; 1722 is the mass, in grams, of
13、 the measuring receptacle full of instant coffee; V is the capacity, in millilitres, of the measuring recep- tacle. Take as the result the arithmetic mean of the values obtained in the two determinations (7.21, provided that the requirement for repeatability (sec 8.2) is satisfied. If it is not, the
14、 determinations shall be repeated. 8.2 Repeatability The differente between the values obtained in the two deter- minations (7.21, carried out in rapid succession by the same Operator on the same laboratory Sample (however, see 7.2) using the same apparatus, shall not exceed 2 % of the mean. 9 Test
15、report The test report shall show the method used and the results ob- tained. lt shall also mention any operating details not specified in this International Standard, or regarded as optional, together with details of any incidents likely to have influenced the results. The test report shall include
16、 all the information necessary for the complete identification of the Sample. Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/23/2007 22:32:33 MDTNo reproduction or networking permitted
17、without license from IHS -,-,- ISO 8460 : 1987 (E) Section two : Determination of compacted bulk density 10 Definition For the purposes of this International Standard, the following definition applies. compacted bulk density (of instant coffee) : The ratio of the mass of instant coffee to the volume
18、 it occupies (mass per unit volume) after it has been subjected to a fixed number of taps (usually 300) under the conditions specified in this Inter- national Standard. lt is conventionally expressed in grams per millilitre. 11 Principle Determination of the volume of a given mass of instant coffee
19、after a fixed number of taps (usually 300) in a tapping volumeter. 12 Apparatus 12.1 Balance, accurate to 0,l g. 12.2 Tapping volumeter, as specified in ISO 787-11 (sec also figure 31, comprising the following Parts. 12.2.1 Graduated measuring cylinder, made of glass, of capacity 250 ml and graduate
20、d in divisions of 2 ml. 12.2.2 Holder, for the measuring cylinder (12.2.1), with a shaft. 12.2.3 Cam, which lifts the shaft of the holder and the measuring cylinder once per revolution and which has a fre- quency of rotation of 250 + 15 min - 1. 12.2.4 Anvil, on which the raised shaft falls from a h
21、eight of 3 f 0,l mm. 12.2.5 Counter, to count the number of revolutions of the cam. 12.2.6 Sleeve, to guide the shaft, constructed of a suitable material to give minimum friction. 13 Sampling See ISO 6670, in particular annex B. 14 Procedure WARNING - On account of the hygroscopic Character of insta
22、nt coffee, the determination should not be carried out in a humid atmosphere, for example higher than 60 % relative humidity. The use of an effective dehumidifica- tion unit is therefore recommended. 14.1 Set the tapping volumeter (12.2) to give 300 taps. Weigh 25,0 g of the laboratory Sample to the
23、 nearest 0,l g and transfer to the graduated measuring cylinder (12.2.1). Attach the cylinder to the tapping volumeter by means of the holder (12.2.21, and allow the volumeter to tap 300 times. Read the volume of the instant coffee from the cylinder to the nearest 2 ml. 14.2 Carry out two determinat
24、ions on the same laboratory Sample. 14.3 In cases where it is suspected that the instant coffee may be subject to breakdown, the volume may be determined using a series of 50 tap sequences to establish whether there is a limiting minimum volume, or whether the volume diminishes continuously. In the
25、latter case, record all the volumes measured. By agreement between the interested Parties, the compacted bulk density may be recorded as that derived from the volume after the first 100 taps or any other number of taps. 15 Expression of results 15.1 Method of calculation and formula The compacted bu
26、lk density, expressed in grams per millilitre, is equal to m -v where m is the mass, in grams, of the test Portion; V is the volume, in millilitres, occupied by the test Portion after compaction. Take as the result the arithmetic mean of the values obtained in the two determinations (14.21, provided
27、 that the requirement for repeatability (see 15.2) is satisfied. If it is not, the determina- tions shall be repeated. 15.2 Repeatability . The differente between the values obtained in the two deter- minations (14.21, carried out in rapid succession by the same Operator on the same laboratory Sampl
28、e using the same apparatus, shall not exceed 2 % of the mean. 16 Test report The test report shall show the method used and the results obtained. lt shall also mention any operating details not specified in this International Standard, or regarded as optiona!, together with details of any incidents
29、likely to have influenced the results. The test report shall include all the information necessary for the complete identification of the Sample. Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Res
30、ale, 04/23/2007 22:32:33 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO 8460 : 1987 (E) Dimensions in miilimetres s x CT, .- 2 0 .- t - Figure 1 I cb 64,5 t 0,s Measuring receptacle -bohrne approximately 205 ml) ( Inside diameter) I Schematic diagram of the apparatus f
31、or determining free-flow bulk density Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/23/2007 22:32:33 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO 8460
32、: 1987 (EI Figure 2 - Apparatus for determining free-flow bufk density 5 Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/23/2007 22:32:33 MDTNo reproduction or networking permitted witho
33、ut license from IHS -,-,- ISO 8460 : 1987 (EI 6 ml 25C =24c =220 =2oc =180 =160 =120 - = 100 = 80 = 60 E 40 = 20 Graduated measuring cylinder Rubber sleeve Sleeve Anvil Holder for the measuring cylinder Figure 3 - Tapping volumeter for determining compacted bulk density Copyright International Organ
34、ization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/23/2007 22:32:33 MDTNo reproduction or networking permitted without license from IHS -,-,- This page intentionally left blank Copyright International Organization for
35、Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/23/2007 22:32:33 MDTNo reproduction or networking permitted without license from IHS -,-,- This page intentionally left blank Copyright International Organization for Standardizat
36、ion Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/23/2007 22:32:33 MDTNo reproduction or networking permitted without license from IHS -,-,- This page intentionally lef? blank Copyright International Organization for Standardization Provided
37、 by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/23/2007 22:32:33 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO 8460 : 1987 (E) UDC 663.938 : 531.755.2 Descriptors : food products, coffee, tests, determination, bulk density, test equipment. Price based on 6 pages Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/23/2007 22:32:33 MDTNo reproduction or networking permitted without license from IHS -,-,-