1、CEN EN*270Z3 92 3404589 0040433 180 EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 27023 November 1992 UDC 621.798.151:620.113 Descriptors: Packing, bags, sampling, tests English version Packaging - Sacks - Method of sampling empty sacks for testing (IS0 7023 : 1983) Emballages - Sacs - Mthode
2、 dchantillonnage de sacs vides pour essais (IS0 7023 : 1983) Packmittel - Scke - Verfahren zur Probenahme leerer Scke fr die Prfung (IS0 7023 : 1983) This European Standard was approved by CEN on 1992-10-30. CEN members are bound to comply with the CENICENELEC Internal Regulations which stipulate th
3、e 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 obtained on application to the Central Secretariat or to any CEN member. This European Standard exists in
4、 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 Central Secretariat has the same status as the official versions. CEN members are the national standards bodies o
5、f Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CEN European Committee for Standardization Comit Europen de Normalisation Europisches Komitee fr Normung Central Secretari
6、at: rue de Stassart 36, B-1050 Brussels O 1992 Copyright reserved to CEN members Ref. No. EN 27023 : 1992 E CEN EN*27023 92 m 3404587 0040432 037 Page 2 EN 27023 : 1992 Foreword In 1991, IS0 7023 : 1983 Packaging - Sacks - Method of sampling empty sacks for testing was submitted to the CEN Primary Q
7、uestionnaire procedure. Following the positive result of the CENCS Proposal IS0 7023 : 1983 is submitted to the Formal Vote. The result of the Formal Vote was positive. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorseme
8、nt, at the latest by May 1993, and conflicting national standards shall be withdrawn at the latest by May 1993. According to the CENKENELEC Internal Regulations, the following countries are bound to implement this European Standard : Austria, Belgium, Denmark, Finland, France, Germany, Greece, Icela
9、nd, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CEN EN*27023 92 = 3404589 0040413 T53 400 or more Page 3 EN 27023 : 1992 20 at random 9 1 Packaging - Sacks - Method of sampling empty sacks for test in g 1 Scope and field of application Th
10、is International Standard specifies a method of obtaining a representative sample of empty sacks for testing. This International Standard is applicable when sampling in order to assess the average quality of a consignment of empty sacks. The method is not suited to sampling for production control. T
11、he method applies to all types of empty sacks. NOTE - It should be noted that the sample is representative only of those sacks available for sampling. Considerable caution should be ex- ercised when extrapolating the results from such sampling to a larger consignment. 2 References IS0 186, Pa,oer an
12、d board - Sampling for testing. IS0 3951, Sampling procedures and charts for inspection by variables for percent defective. i i 3 Definitions For the purpose of this International Standard, the following definitions apply. 3.1 lot : The aggregate of sacks which are of a single kind with specified ch
13、aracteristics, on which a judgement is desired (usually as to compliance with specification) and which are available for sampling. NOTES 1 The number of sacks comprising a lot may be indicated on the in- voice or agreed upon by the contracting parties. 2 When the number of sacks available for sampli
14、ng is less than the lot size agreed or indicated on the invoice, the total number of sacks available may be taken as a lot subject to the caution given in the note to clause 1. 3.2 unit : The unit may be in the form of a bundle, bale, pallet load, container load, etc. One or more nominally identical
15、 units constitute a lot. 3.3 element : The element may be in the form of a bundle, bale, pallet load etc., but cannot be a single sack. One or more nominally identical elements constitute a unit. 3.4 sample A specified number of sacks selected accor- ding to a prescribed procedure to represent the l
16、ot. 3.5 selected at random : Taken in such a way that each part of the whole has an equal chance of being selected. 4 Principle Selection at random of a prescribed number of sacks from the lot following a two-stage procedure as follows : a) (see 5.1). Selection of a prescribed number of units from t
17、he lot b) Use of one of the following two procedures : 1) Where the unit is not subdivided into elements, selection of a prescribed number of sacks from each of these units (see 5.2.1). 2) Where the unit is subdivided into elements, selec- tion of a prescribed number of elements from each of these u
18、nits, then selection of a prescribed number of sacks from these elements (see 5.2.2). 5 Procedure 5.1 Selection of units Determine and select the number of units to be sampled, accor- ding to table 1. NOTE - Table 1 has been taken from IS0 186. Table 1 Method of in the lot selected selection 6to 99
19、at random n* 100 to 399 at random I CEN ENa27023 72 m 3404589 00404LY 99T m Page 4 EN 27023 : 1992 5.2 Selection of sacks For each unit selected from the lot, proceed as follows : 5.2.1 When the unit is not subdivided into elements Take at random an equal number of sacks from each unit so that the t
20、otal number taken from the lot is not less than the number of sacks required for testing and conforms to the re- quirements of table 2. NOTE - Relevant information for table 2 has been extracted from the first two columns in both tables I-A and Il-A of IS0 3951. Table 2 Number of sacks in the lot Mi
21、nimum number of sacks to be taken from the lot Not more than 280 3 281 to 500 4 501 to 1200 5 1201 to 3 200 7 3 201 to 10 o00 10 10 O01 to 35 o00 15 More than 35 o00 20 5.2.2 When the unit is subdivided into elements If there are 20 or more elements in each unit, assemble all the elements in the sel
22、ected units and, using table 1, select the elements in the same way that the units were selected. If there are less than 20 elements in each unit, select one ele ment at random from each unit. At least one element should be selected from each unit. Finally, take at random an equal number of sacks fr
23、om each ele- ment selected so that the total number taken from the lot is not less than the number of sacks required for testing and con- forms to the requirements of table 2. 6 Additional requirements 6.1 Precautions The sacks selected shall be kept and handled so that there is no permanent change
24、in their properties before testing. 6.2 Marking Each sack that has been selected shall have adequate identifica- tion marks to prove its origin. 6.3 Re-sampling 6.3.1 If, as a result of an accident during sampling or testing, re-sampling is necessary, a new sample shall be taken, follow- ing the abo
25、ve procedure. Selection may then, however, be made from the same units as before unless agreed otherwise. 6.3.2 If re-sampling is needed for any other reason, the pro- cedure adopted should follow this specification as closely as possible. 7 Test report The report shall indicate the following partic
26、ulars a) a reference to this International Standard; b) the names and addresses of the purchaser and vendor; c) the date and place of sampling; di the description of the lot; e) the number of units in the lot; f) the number of units selected; g) the number of elements, if any, in a unit; h) the numb
27、er of elements selected; j) the number of sacks in the lot; k) the number of sacks selected; m) any circumstances which might influence the results of future tests; n) a reference corresponding to the identification marks on the sacks: pi the signature of the person carrying out the sampling; q) any deviation from this International Standard.
