1、BRITISH STANDARD BS EN ISO 8442-5:2004 Materials and articles in contact with foodstuffs Cutlery and holloware Part 5: Specification for sharpness and edge retention test of cutlery The European Standard EN ISO 8442-5:2004 has the status of a British Standard ICS 67.250; 97.040.60 BS EN ISO 8442-5:2
2、004 This British Standard was published under the authority of the Standards Policy and Strategy Committee on 24 January 2005 BSI 24 January 2005 ISBN 0 580 45309 X National foreword This British Standard is the official English language version of EN ISO 8442-5:2004. It is identical with ISO 8442-5
3、:2002. The UK participation in its preparation was entrusted to Technical Committee CW/17, Cutlery and table holloware, which has the responsibility to: A list of organizations represented on this committee can be obtained on request to its secretary. Cross-references The British Standards which imp
4、lement international or European publications referred to in this document may be found in the BSI Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Search” facility of the BSI Electronic Catalogue or of British Standards Online. This publication d
5、oes not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. aid enquirers to understand the text; present to the responsible international/Europ
6、ean committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. Summary of pages This document comprises a front cover, an inside front cover, the EN ISO title page,
7、 pages 2 to 15 and a back cover. The BSI copyright notice displayed in this document indicates when the document was last issued. Amendments issued since publication Amd. No. Date CommentsEUROPEANSTANDARD NORMEEUROPENNE EUROPISCHENORM ENISO84425 December2004 ICS67.250;97.040.60 Englishversion Materi
8、alsandarticlesincontactwithfoodstuffsCutleryand tablehollowarePart5:Specificationforsharpnessandedge retentiontestofcutlery(ISO84425:2004) Matriauxetobjetsencontactaveclesdenres alimentairesCoutellerieetorfvreriedetablePartie5: Spcificationdutranchantetessaideconservationdu tranchant(ISO84425:2004)
9、WerkstoffeundGegenstndeinKontaktmitLebensmitteln SchneidwarenundTafelgerteTeil5:Festlegungder SchneidfhigkeitundPrfungderKantenbestndigkeit (ISO84425:2004) ThisEuropeanStandardwasapprovedbyCENon10October2002. CENmembersareboundtocomplywiththeCEN/CENELECInternalRegulationswhichstipulatetheconditionsf
10、orgivingthisEurope an Standardthestatusofanationalstandardwithoutanyalteration.Uptodatelistsandbibliographicalreferencesconcernings uchnational standardsmaybeobtainedonapplicationtotheCentralSecretariatortoanyCENmember. ThisEuropeanStandardexistsinthreeofficialversions(English,French,German).Aversio
11、ninanyotherlanguagemadebytra nslation undertheresponsibilityofaCENmemberintoitsownlanguageandnotifiedtotheCentralSecretariathasthesamestatusast heofficial versions. CENmembersarethenationalstandardsbodiesofAustria,Belgium,Cyprus,CzechRepublic,Denmark,Estonia,Finland,France, Germany,Greece,Hungary,Ic
12、eland,Ireland,Italy,Latvia,Lithuania,Luxembourg,Malta,Netherlands,Norway,Poland,Portugal, Slovakia, Slovenia,Spain,Sweden,SwitzerlandandUnitedKingdom. EUROPEANCOMMITTEEFORSTANDARDIZATION COMITEUROPENDENORMALISATION EUROPISCHESKOMITEEFRNORMUNG ManagementCentre:ruedeStassart,36B1050Brussels 2004CEN Al
13、lrightsofexploitationinanyformandbyanymeansreserved worldwideforCENnationalMembers. Ref.No.ENISO84425:2004:EEN ISO 8442-5:2004 (E) 2 Contents page Foreword3 1 Scope 4 2 Terms and definitions .4 3 Testing 5 4 Principle6 5 Test medium.7 6 Apparatus .8 7 Test procedure.10 8 Expression of results 11 Ann
14、ex A (normative) Calibration of cutting test apparatus.13 EN ISO 8442-5:2004 (E) 3 Foreword This document (EN ISO 8442-5:2004) has been prepared by Technical Committee CEN /TC 194, “Utensils in contact with food“, the secretariat of which is held by BSI, in collaboration with Technical Committee ISO
15、/TC 186 “Cutlery and table and decorative metal hollow-ware“. 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 June 2005, and conflicting national standards shall be withdrawn at the latest by June
16、 2005. Annex A is normative. EN ISO 8442 consists of the following parts: Part 1: Requirements for cutlery for the preparation of food Part 2: Requirements for stainless steel and silver-plated cutlery Part 3: Requirements for silver-plated table and decorative holloware Part 4: Requirements for gol
17、d-plated cutlery Part 5: Specification for sharpness and edge retention test of cutlery Part 6: Lightly silver-plated table holloware protected by laquer Part 7: Specification for table cutlery made of silver, other precious metals and their alloys Part 8: Specification for silver table and decorati
18、ve holloware According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Ital
19、y, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. EN ISO 8442-5:2004 (E) 4 1 Scope This European Standard specifies the sharpness and edge retention of knives which are produced for professional and dome
20、stic use in the preparation of food of all kinds, specifically those knives intended for hand use. Powered blade instruments of any kind are excluded. Generally these types of knives are manufactured with blades of either plain edge design or with edges incorporating particular features to enhance o
21、r optimize aspects of cutting ability. The following two types of knife blade are suitable for the cutting test: Type A edges: Cutting edges which can be resharpened by the user and edges with a pitch greater than 1 mm; Type B edges: Cutting edges which are not intended to be resharpened on a steel.
22、 Whilst these knives are predominantly manufactured with blades made from various grades of heat treated steels, the testing of knives of any construction or blade material is not precluded providing that the test criteria are met. The principle of the testing is to reproduce a cutting action, by fo
23、rward and reverse strokes, against a pack of synthetic test medium under controlled parameters. 2 Terms and definitions For the purposes of this European Standard, the following terms and definitions apply. 2.1 cutlery utensils for the preparation and serving of food having a blade with a cutting ed
24、ge 2.2 centre line line which generally bisects the cross-section of the blade passing through the cutting edge and the back of the blade (see Figure 1) EXAMPLE EN ISO 8442-5:2004 (E) 5 Figure 1 Centreline 2.3 initial cutting performance (ICP) cutting ability to be expected by the user from a knife
25、when supplied “as new” from the factory or point of sale 2.4 cutting edge retention (CER) ability of the knife blades edge to resist wear throughout its useful life 2.5 total card cut (TCC) cumulative amount of card cut (measured in millimetres) by the test knife over the duration of a full test 2.6
26、 cutting cycle one forward plus one reverse stroke of the designated length of the blade against the medium 3 Testing 3.1 General When tested in accordance with the test method of clause 7 each type of knife shall conform to 3.2 to 3.4. This test shall be carried out before any other physical or mec
27、hanical test so that edge performances are assessed in the “as received” condition. 3.2 Test length The portion of the cutting edge of the blade to be tested (see 3.3) shall be straight except for a maximum deviation (positive or negative, not both) of 1 mm. In the case of type “ B “ edges the shape
28、 of the blade is considered to be the underlying profile on which the detail is superimposed (see Figure 2). EN ISO 8442-5:2004 (E) 6 Key A Max. deviation from straight (shown positive) B Stroke length Figure 2 Blade to be tested 3.3 Test conditions The same test is applied to both types of knives b
29、ut the duration for the purpose of establishing cutting edge retention is determined by the type of edge. Test parameters are given in Table 1. Table 1 Cutting test parameters Blade edge Type Test load N Stroke Length (mm) Nominal cutting speed (mm/s) Total no. Cutting cycles (F) A 50 40 50 60 B 50
30、40 50 200 3.4 Cutting performance When tested in accordance with clause 7 the minimum initial cutting performance (ICP) and cutting edge retention (CER) shall conform to the performance levels specified in Table 2. Table 2 Performance levels Blade edge type Minimum ICP mm Minimum CER (TCC) mm A 50 1
31、50 B 50 1 500 4 Principle Performance of the blade in terms of distance cut through the medium on each cycle is measured throughout the duration of the test, which is designed to accelerate wear of the knife blade over a short period. Blades shall cut an adequate amount of medium to complete the tes
32、t and the two cutting performance indicators ICP and CER are calculated in accordance with clause 8 from the accumulated data. EN ISO 8442-5:2004 (E) 7 5 Test medium A specially developed chemical pulp is produced in the form of sheets of card containing a controlled amount of abrasive material i.e.
33、 quartz. This card shall be pure chemical soda pulp without any other chemical additive except for the addition of silica in the proportion of (5 0,5) % by weight. The properties of the quartz shall conform to Tables 3 to 5. The quartz shall have the percentage composition of chemical elements speci
34、fied in Table 3. Table 3 Composition of silica abrasive Compound Composition % SiO 299 Fe 0,013 Al 2 O 30,22 MgO Nil Alkalines Nil The grain size distribution of quartz shall be as specified in Table 4. Table 4 Grain size distribution of silica - C 400 Grain size m Composition (in weight) % 50 0,2 3
35、0 4,7 20 15 16 2 12 11 10 10 8 7 6 9 4 12 2 29 To satisfy the test arrangement the card is cut into 10 mm wide strips (with the fibres of the card grain flowing across the strip) and compiled into a pack maximum 50 mm deep when clamped under pressure (130 2,5) N in a holder as shown in Figure 3. The
36、 physical properties of each strip shall be as specified in Table 5. Table 5 Physical properties Thickness mm Weight g/m Strip (pack) width mm 0,31 0,02 200 10 10,0 0,1 EN ISO 8442-5:2004 (E) 8 Before use, the test medium shall be conditioned in a controlled atmosphere of (55 5) % relative humidity
37、at (20 2) C for a period of 24 h. The card shall be open to this atmosphere and used within 4 h of removal from it. 6 Apparatus NOTE A suitable apparatus for performing the cutting test is shown in Figure 3 and comprises the elements of 6.1 to 6.6. 6.1 Card strip holder A rigid holder with a 10 mm w
38、ide aperture to hold the strips of card (max. 50 mm deep). The holder shall provide sideways restraint against the cutting force of the knife and also a support bar above the card, which protrudes, from the holder to provide the reaction against the 50 N test load throughout the test. The card pack
39、shall be clamped by a force of (130 2,5) N on the inboard side of the cutting line and any cut card shall be allowed to fall away freely (see also Figure 4). 6.2 Counterbalance arrangement An arrangement of add-on or counterbalance weights, which in conjunction with the card and holder, vertical sli
40、de element and all its fittings shall result in a total vertical static load at the interface between card and blade of 50 2 0 +N (average over the working range) at the start of each new test. 6.3 Blade fixture A fixture, which holds the blade and presents the cutting edge uppermost and provides su
41、pport against the test load and also a means of easy levelling of the test lengths. The centre line through the section of the blade shall be vertical. When held in the fixture, the blade edge shall be capable of cutting through the 50 mm of card cleanly without any undue frictional influences excep
42、ting that from the blades sharpened bevel against the face of the uncut card. The blade edge shall be prevented from coming into contact with the metal support bar by means of an independent depth stop. 6.4 Transverse blade slide unit A transverse frictionless slide unit, on which the blade fixture
43、shall be mounted to reduce the influence of friction forces between the blades sharpened bevel and face of the uncut card. This will allow movement of the blade away from the card holder during the cutting strokes, normal to the direction of the cutting strokes. At the beginning of the first stroke
44、through each 50 mm block of card the point at which the blade starts its cut shall be (3 0,2) mm away from the edge of the card holder/clamp. The end of the card pack should be straight and aligned to an approximate angle of 20 to the vertical to allow an approximately equal length of card beyond th
45、e cutting point. 6.5 Longitudinal blade slide unit A longitudinal frictionless slide table, which provides the motion to the blade in the direction of the cutting strokes. This shall have a drive system which is capable of producing a nominal 50 mm/s cutting speed, which is achieved by maintaining a
46、 more or less constant speed of 50 mm/s over at least 90 % of the specified stroke, with rapid acceleration and deceleration at the ends. This parameter will be verified over several non-cutting cycles and the result shall be (45 0,5) mm/s average speed. The stroke shall also be repeatable within (4
47、5 0,5) mm/s average and verified over several non-cutting cycles of the table. 6.6 Card cut amount transducer A displacement transducer, capable of measuring the depth of cut through the pack of card on each cutting cycle, with a minimum resolution of 0,1 mm (i.e. 1/3 card thickness). EN ISO 8442-5:
48、2004 (E) 9 Key C Cutting strokes N Medium feed forwards D 1 stcut datum R Retaining clamp E Test blade S Longitudinal slide F Component fixture T Transverse slide H Medium holder U Motor & ballscrew drive mechanism K Depth of cut measured by slide travel V Vertical slide M Medium W Additional test weight Figure 3 Schematic arrangement of suitable test apparatus EN ISO 8442-5:2004 (E) 10 No test shall be performed within 25 mm of the start of the new pack. Key x 20 ICF Independent c
