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1、BRITISH STANDARD BS EN ISO 1886:1995 BS 2782-10: Method 1007:1995 Reinforcement fibres Sampling plans applicable to received batches The European Standard BS EN ISO 1886:1994 has the status of a British Standard Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 19 13:19:48 GMT+00:00 2006, Uncontro
2、lled Copy, (c) BSI BS EN ISO 1886:1995 This British Standard, having been prepared under the direction of the Materials and Chemicals Sector Board (I/-), was published under the authority of the Standards Board and comes into effect on 15 February 1995 BSI 12-1999 The following BSI references relate
3、 to the work on this standard: Committee reference PRI/41 Draft for comment 87/38633 DC ISBN 0 580 23664 1 Cooperating organizations The European Committee for Standardization (CEN), under whose supervision this European Standard was prepared, comprises the national standards organizations of the fo
4、llowing countries: AustriaOesterreichisches Normungsinstitut BelgiumInstitut belge de normalisation DenmarkDansk Standard FinlandSuomen Standardisoimisliito, r.y. FranceAssociation franaise de normalisation GermanyDeutsches Institut fr Normung e.V. GreeceHellenic Organization for Standardization Ice
5、landTechnological Institute of Iceland IrelandNational Standards Authority of Ireland ItalyEnte Nazionale Italiano di Unificazione LuxembourgInspection du Travail et des Mines NetherlandsNederlands Normalisatie-instituut NorwayNorges Standardiseringsforbund PortugalInstituto Portugus da Qualidade Sp
6、ainAsociacin Espaola de Normalizacin y Certificacin SwedenStandardiseringskommissionen i Sverige SwitzerlandAssociation suisse de normalisation United KingdomBritish Standards Institution Amendments issued since publication Amd. No.DateComments Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 19
7、13:19:48 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN ISO 1886:1995 BSI 12-1999i Contents Page Cooperating organizationsInside front cover National forewordii Foreword2 Introduction3 1Scope3 2Normative references3 3Definitions3 4Choice of sampling plan5 5Sampling6 6Procedure6 7Determination of b
8、atch acceptability9 8Sampling report10 National annex NA (informative) Committees responsibleInside back cover National annex NB (informative) Cross-referencesInside back cover Figure 1 Example of an operating characteristic curve5 Figure 2 Acceptance curve for an AQL of 1.5 %11 Table 1 Inspection b
9、y attributes (normal inspection)7 Table 2 Inspection by measurements (normal inspection)8 Table 3 Individual results obtained in example 29 Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 19 13:19:48 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN ISO 1886:1995 ii BSI 12-1999 National foreword
10、This British Standard has been prepared under the direction of the Materials and Chemicals Sector Board and is the English language version of EN ISO 1886:1994 Reinforcement fibres Sampling plans applicable to received batches, published by the European Committee for Standardization (CEN). It is ide
11、ntical with ISO 1886:1990 published by the International Organization for Standardization (ISO). It does not supersede any current British Standard but attention is drawn to BS 2545 Methods of fibre sampling for testing and BS 4784 Methods for determination of commercial mass of consignments of text
12、iles Part 2 Methods for obtaining laboratory samples. 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
13、obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, the EN ISO title page, pages 2 to 12, 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 indicate
14、d in the amendment table on the inside front cover. Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 19 13:19:48 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 1886 October 1994 ICS 59.100.00 Descriptors: Plastics, reinforcing materials, fibres
15、, sampling English version Reinforcement fibres Sampling plans applicable to received batches (ISO 1886:1990) Fibres de renfort Mthodes dchantillonnage pour le contrle de rception de lots (ISO 1886:1990) Verstrkungsfasern Stichprobenaweisungen fr die Loseingsprfung (ISO 1886:1990) This European Stan
16、dard was approved by CEN on 1994-08-25. 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
17、 national standards may be obtained on application to the Central Secretariat 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 a
18、nd notified to the Central Secretariat has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United
19、 Kingdom. CEN European Committee for Standardization Comit Europen de Normalisation Europisches Komitee fr Normung Central Secretariat: rue de Stassart 36, B-1050 Brussels 1994 Copyright reserved to CEN members Ref. No. EN ISO 1886:1994 E Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 19 13:19:
20、48 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN ISO 1886:1994 BSI 12-1999 2 Foreword This European Standard was taken over by the Technical Committee CEN/TC 249, Plastics, from the work of ISO/TC 61, Plastics, of the International Organization for Standardization (ISO). CEN/TC 249 has decided to su
21、bmit the final draft for formal vote. The result was positive. 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 April 1995, and conflicting national standards shall be withdrawn at the latest by Ap
22、ril 1995. According to the CEN/CENELEC Internal Regulations, the following countries are bound to implement this European Standard: Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland, United King
23、dom. Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 19 13:19:48 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN ISO 1886:1994 BSI 12-19993 Introduction As indicated in the title, this International Standard is designed for received batches and not for inspection during manufacturing of a product.
24、 In the latter case, the manufacturer should have the necessary facilities available and a good knowledge of the product, thus allowing him to assure the quality through an appropriate control system. For checking received batches, the customer has only limited information about a given product. The
25、 sampling plans described hereafter are intended as “normal” plans, and require a certain number of results for the assessment of a batch to a given confidence level. Other sampling plans, i.e. reduced or tightened plans, can be considered, depending on the product type, the application for which th
26、e product is intended, the test method and the degree of inspection required. The choice of sampling plan and the extent of sampling depends on the knowledge of the product acquired by the customer during product qualification, plus information from routine inspections of received batches; the degre
27、e of confidence that the customer is prepared to accord the inspections undertaken by the manufacturer. 1 Scope This International Standard specifies two methods of sampling by attributes or by measurements (variables) applicable to batches of reinforcement materials (in particular textile glass, ca
28、rbon fibre and aramid fibre) in various forms (e.g. package, roll, bulk material). For both methods, this International Standard includes tables with acceptance and rejection criteria based on a given number of acceptable quality levels (AQLs) that are usually applied to the various reinforcement ma
29、terials. 2 Normative references The following standards contain provisions which, through reference in this text, constitute provisions of this International Standard. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements base
30、d on this International Standard are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below. Members of IEC and ISO maintain registers of currently valid International Standards. ISO 472:1988, Plastics Vocabulary. ISO 2859-1:1989, Sampling pro
31、cedures for inspection by attributes Part 1: Sampling plans indexed by acceptable quality level (AQL) for lot-by-lot inspection. ISO 3534:1977, Statistics Vocabulary and symbols. ISO 3951:1989, Sampling procedures and charts for inspection by variables for percent nonconforming. 3 Definitions For th
32、e purposes of this International Standard, the definitions given in ISO 472, ISO 2859-1, ISO 3534 and ISO 3951 apply, plus the following definitions, some of which are versions of definitions already published in ISO 3534, for instance, but reworded to suit the particular context of this Internation
33、al Standard. 3.1 sampling plan a series of rules established to obtain, through the selection of a sample and its subsequent analysis, an evaluation which is as reliable as possible of the quality of a received batch, so as to determine, using criteria defined in the product specification, if this b
34、atch is acceptable for the purposes of this International Standard, two main sampling methods are considered: by attributes and by measurements (variables) 3.2 elementary unit the smallest normally commercially available entity of a given product the description (form, dimensions, mass, etc.) of the
35、 elementary unit will normally be defined in the product specification. This unit may be supplied in one of several forms: package (single yarn, folded or cabled yarn, roving, etc.); roll (mat, woven fabric, veil, etc.); the smallest physical entity in a bulk product (e.g. chopped fibres, milled fib
36、res). NOTE 1For a given product, the dimensions, mass or volume of the elementary unit may change, as fabrication techniques evolve, without necessarily causing any modification in the product properties or the way in which these properties vary throughout the elementary unit. As an example, while s
37、ome years ago a bobbin of yarn had a weight of 2 kg, the same item can now be supplied as a 10 kg bobbin. In both cases, it is the bobbin which must be considered as the elementary unit. 3.3 case the smallest conveniently handleable unit (i.e. a carton or other container), which may contain one or m
38、ore elementary units of the same type and quality Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 19 13:19:48 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN ISO 1886:1994 4 BSI 12-1999 3.4 batch (dispatched or received batch) a definite quantity of product made up of elementary units of the same
39、type and produced under conditions assumed to be constant a batch may constitute all or part of any particular order the cases making up a batch may be handleable individually, or several may by assembled together on a pallet. All the cases constituting a batch are dispatched to, or intended for, a
40、single customer and accompanied by a single dispatch note NOTE 2In addition to the concept of a shipped batch, the user of this International Standard should be aware of the concept of a production batch. The latter concept generally applies only when production takes place in discontinuous runs. Th
41、is is the case with carbon fibres, for instance, which must therefore be indentified by indicating the production batch on each case. For continous production (most textile-glass items, for example), the production-batch concept does not apply. Nevertheless, each case should, in principle, be marked
42、 with a production date. If, within a particular shipped batch, there are widely separated production dates, manufacturer and customer may agree to consider sampling each production run separately. 3.5 acceptability quality level (AQL) the maximum percent nonconforming (or the maximum number of nonc
43、onformities per 100 units) that, for purposes of sampling inspection, can be considered satisfactory as a process average the AQL will normally be defined, for each property, in the product specification. It may not be the same for all properties. In addition, properties subject to a lower limit and
44、 an upper limit may have a different AQL for each limit 3.6 sample a given number of elementary units which have been selected at random with a view to performing a test either directly on these units or on one or more specimens taken from the units NOTE 3Where necessary, an additional sampling stag
45、e may be carried out on these elementary units to give a laboratory sample (e.g. a single piece of fabric or a given amount of chopped fibres). Instructions for the preparation of this laboratory sample will normally be given in the test method concerned. 3.7 inspection by attributes (counting nonco
46、nformities) a method of inspection that, for every selected elementary unit, determines either the presence or absence of one or more qualitative characteristics; or the conformance or not of a properly with one or more limits defined in the manufacturers specification. the number of nonconforming u
47、nits is then compared to the AQL given in the product specification to determine whether the batch should be accepted or rejected (see example 1, subclause 7.1) 3.8 inspection by measurements (variables) a method of inspection that consists of measuring one or more quantitative characteristics for e
48、ach elementary unit in a batch or in a sample taken from the batch. Each quantitative characteristic must be measurable on a continuous scale. If more than one characteristic is measured, it requires only one characteristic to be unsatisfactory for the batch to be unacceptable this method of inspect
49、ion using measurements is only applicable to characteristics that obey a normal (i.e. Gaussian) distribution law for the purposes of this International Standard, the measurement results obtained for each elementary unit are used to calculate the mean for the sample and the standard deviation. From these data, the lower quality statistic QL and/or the upper quality statistic QU are calculated, using the formulae given in example 2 (see 7.2.1), and QL and/or QU then compared with the acceptability constant k (see T