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1、BRITISH STANDARD BS ISO 7769:2006 Textiles Test method for assessing the appearance of creases in fabrics after cleansing ICS 59.080.30 ? BS ISO 7769:2006 This British Standard was published under the authority of the Standards Policy and Strategy Committee on 7 March 2006 BSI 7 March 2006 ISBN 0 58
2、0 47937 4 National foreword This British Standard reproduces verbatim ISO 7769:2006 and implements it as the UK national standard. The UK participation in its preparation was entrusted to Technical Committee TCI/82, Textiles Care labelling, dry cleaning, laundering, which has the responsibility to:
3、A list of organizations represented on this committee can be obtained on request to its secretary. Cross-references The British Standards which implement international publications referred to in this document may be found in the BSI Catalogue under the section entitled “International Standards Corr
4、espondence Index”, or by using the “Search” facility of the BSI Electronic Catalogue or of British Standards Online. This publication does 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
5、 of itself confer immunity from legal obligations. aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep UK interests informed; monitor related international and European developments a
6、nd promulgate them in the UK. Summary of pages This document comprises a front cover, an inside front cover, the ISO title page, pages ii to iv, pages 1 to 8, an inside back cover and a back cover. The BSI copyright notice displayed in this document indicates when the document was last issued. Amend
7、ments issued since publication Amd. No. DateComments Reference number ISO 7769:2006(E) INTERNATIONAL STANDARD ISO 7769 Third edition 2006-02-15 Textiles Test method for assessing the appearance of creases in fabrics after cleansing Textiles Mthode dessai pour lvaluation de laspect des plis des toffe
8、s aprs nettoyage BS ISO 7769:2006 ii iii Contents Page Foreword iv 1Scope . 1 2Normative references. 1 3Principle. 1 4Apparatus 1 5Test specimens. 2 6Procedure 2 7Expression of results . 3 8Test report . 3 Annex A (informative) Precision and bias statement . 7 BS ISO 7769:2006 iv Foreword ISO (the I
9、nternational Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee
10、has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnica
11、l standardization. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2. The main task of technical committees is to prepare International Standards. Draft International Standards adopted by the technical committees are circulated to the member bod
12、ies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO shall not be held responsible for identifying any
13、 or all such patent rights. ISO 7769 was prepared by Technical Committee ISO/TC 38, Textiles, Subcommittee SC 2, Cleansing, finishing and water resistance tests. This third edition cancels and replaces the second edition (ISO 7769:1992), which has been technically revised. BS ISO 7769:2006 1 Textile
14、s Test method for assessing the appearance of creases in fabrics after cleansing 1 Scope This International Standard specifies a test method for evaluating the retention of pressed-in creases in fabrics after one or several cleansing treatments. A technique for inserting creases is not included as t
15、his is controlled by fabric properties. This method has been developed for use primarily with type B domestic washing machines, as defined in ISO 6330, in the cleansing process. However, it may be possible to use it with type A machines, as defined in the same International Standard. 2 Normative ref
16、erences The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 105-A03, Textiles Tests for colour fa
17、stness Part A03: Grey scale for assessing staining ISO 139, Textiles Standard atmospheres for conditioning and testing ISO 3175 (all parts), Textiles Professional care, drycleaning and wetcleaning of fabrics and garments ISO 6330, Textiles Domestic washing and drying procedures for textile testing 3
18、 Principle 3.1 Creased fabric specimens are subjected to procedures simulating cleansing practices. One of the domestic washing and drying procedures specified in ISO 6330 or one of the professional procedures specified in the series of ISO 3175 is used, as agreed between the interested parties. 3.2
19、 Evaluation is performed by supplementing the overhead lighting arrangement with a spotlight suitably placed to highlight the creased area. The specimens are compared visually with plastic crease replicas under specified illumination. 4 Apparatus 4.1 Washing and drying apparatus, as specified in ISO
20、 6330, or professional care apparatus, as specified in ISO 3175. 4.2 Steam or dry iron, with appropriate fabric temperature settings. BS ISO 7769:2006 2 4.3 Lighting The evaluation area shall be a darkened room, using the lighting arrangement shown in Figures 1 and 2 and comprising the following ite
21、ms. Lamp dimensions should be chosen to extend beyond the overall surface of a test specimen and replicas, when used for the assessment. 4.3.1Two CW (cool white) fluorescent lamps, without baffle or glass, a minimum of 2 m in length each, placed side by side. 4.3.2One white enamel reflector, without
22、 baffle or glass. 4.3.3One thick plywood viewing board, painted grey to match No. 2 rating on the grey scale for assessing staining specified in ISO 105-A03. 4.3.4One 500-W reflector flood lamp and lightshield (for the purpose of protecting the viewers eyes from direct light as illustrated in Figure
23、 2). 4.4 Plastic crease replicas, prepared for evaluating creases, as shown in Figure 3 1) . 5 Test specimens Prepare three test specimens, each measuring 38 cm ? 38 cm and pinked to prevent fraying, each with a press-in crease through the middle. If the fabric is wrinkled, it may be smoothed by app
24、ropriate ironing prior to testing. Care shall be taken to avoid altering the quality of the crease itself. 6 Procedure 6.1 Treat each specimen according to one of the procedures specified in ISO 6330 or ISO 3175, as agreed between the interested parties. 6.2 If required, repeat the selected treatmen
25、t four times, to give a total of five cycles. 6.3 Condition the test specimens for a minimum of 4 h and maximum of 24 h, according to ISO 139, by hanging each specimen by two corners with the crease vertical or, alternatively, using full-width clamps. 6.4 Evaluation 6.4.1 Three observers shall rate
26、each treated test specimen independently, as follows. 6.4.2 Mount the test specimen on the viewing board (4.3.3) as illustrated in Figure 1, with the crease in the vertical direction, taking care not to distort the crease. Place the plastic crease replicas (4.4) alongside to facilitate comparative r
27、ating. Place the most similar plastic crease replicas on each side of the test specimen. Mount replicas 1, 3 or 5 on the left and 2 or 4 on the right. 6.4.3 The observer shall stand directly in front of the specimen, 1,2 m away from the viewing board. It has been found that normal variations in the
28、height of the observer above and below the arbitrary 1,5 m eye level have no significant effect on the rating given. 1) The replicas shown in Figure 3 are for illustration purposes only. These replicas may be obtained from AATCC Technical Center, One Davis Drive, P O Box 12215, Research Triangle Par
29、k, North Carolina 27709-2215 (USA); Tel: +919-549-8141; Fax: +919-549-8933; http:/www.aatcc.org. This information is given for the convenience of users of this International Standard and does not constitute an endorsement by ISO of the product named. Equivalent products may be used if they can be sh
30、own to lead to the same results. BS ISO 7769:2006 3 The overhead fluorescent light (4.3.1) and the side flood light shall be the only light source for the viewing board, and all other lights in the room shall be turned off. It has been the experience of many observers that the light reflected from t
31、he side walls near the viewing board can interfere with the rating results. It is recommended that the side walls be painted black or that blackout curtains be mounted on either side of the viewing board to eliminate the reflective interference. 6.4.4 Compare the retention of the specimen crease wit
32、h the plastic crease replicas (see Figure 3), using the prescribed lighting arrangement in a darkened room as shown in Figures 1 and 2. Assign the number of the plastic crease replica that most nearly matches the appearance of the specimen crease (see Figure 3 and Table 1), or assign ratings midway
33、between those whole-number standards, if the appearance of the specimens warrants it. Table 1 Crease appearance ratings Class Crease appearance 5 Equivalent to standard CR-5 4,5 Midway between standard CR-4 and CR-5 4 Equivalent to standard CR-4 3,5 Midway between standard CR-3 and CR-4 3 Equivalent
34、 to standard CR-3 2,5 Midway between standard CR-2 and CR-3 2 Equivalent to standard CR-2 1,5 Midway between standard CR-1 and CR-2 1 Equivalent to or worse than standard CR-1 6.4.5 Similarly, the observer shall independently rate each of the other two test specimens. The other two observers shall p
35、roceed in the same manner, assigning ratings independently. 7 Expression of results Average the nine observations made by the three observers on the set of three test specimens. Report the average to the nearest half of a rating. 8 Test report The test report shall include the following information:
36、 a) a reference to this International Standard (ISO 7769:2006); b) details of the sample evaluated; c) details of the cleansing procedures used; d) the number of cleansing cycles used; e) the crease appearance rating as calculated in accordance with Clause 7, and expressed according to Table 1; f) d
37、etails of any deviation from the specified procedure. BS ISO 7769:2006 4 Dimensions in metres Key 1 replica 2 test specimen 3 board for viewing 4 example of fluorescent lamp placement Figure 1 Lighting equipment for viewing test specimens BS ISO 7769:2006 5 Dimensions in metres Key 1 replica 2 test
38、specimen 3 light shield 4 500-W reflector flood lamp 5 observer 6 arbitrary eye level Figure 2 Lighting and viewing arrangement BS ISO 7769:2006 6 Figure 3 Plastic crease replicas BS ISO 7769:2006 7 Annex A (informative) Precision and bias statement A.1 Preliminary tests A series of inter-laboratory
39、 tests was conducted during development of the set of five plastic replica standards. From this work, it was concluded that: a) replica standards were preferred over photographic standards; b) replica standards did not change the level of ratings; c) the absence of side-lighting raised the level of
40、ratings; d) rating to half-units improved precision. This was the basis for adopting the set of replica standards, retaining side-lighting and allowing rating to half- units. A.2 Precision Using the adopted set of replica standards, five fabrics spanning the range of ratings from 1 to 5, three speci
41、mens per fabric, were rated by six observers at a single laboratory location (December 1985). With all conditions identical for the six observers, this data set provided an unbiased estimate of the frequency distribution of observer ratings about an unexpected rating value (or the variability to be
42、expected in observer ratings). Because of the limited and discontinuous scale of replica ratings, the analysis of variance technique was judged not to be applicable to this data set, but such a scale imposes no such restriction with regard to frequency distributions. From the data set, it was determ
43、ined that observers rate individual specimens to an expected half-rating (?) on the following frequency: Rated a whole unit under the expected value 0,011 11 Rated a half-unit under the expected value 0,133 34 Rated to expected value (?)0,600 00 Rated a half-unit over the expected value 0,200 00 Rat
44、ed a whole unit over the expected value 0,055 55 Total 1,000 00 Starting with the near-normal distribution for observer determinations (designated distribution 1), it was used to calculate the following additional distribution: 2) the probability of differences between observers (single determinatio
45、n); 3) the distribution of observer totals of three determinations about an expected value; 4) the probability of differences between observers (three determinations per total); 5) the distribution of laboratory totals of three observer totals (nine rating determinations, three each by three observe
46、rs) about an expected value; and 6) the probability of differences between laboratories (nine determinations per total). Adhering to fiducial limits based on the usual P ? 0,05 (or, in some instances, slightly more favourable), critical differences were established from three different distributions
47、 as given in Table A.1 BS ISO 7769:2006 8 Table A.1 Critical differences Source Critical difference (average) Probability P Between two observers (one determination each 1 0,03 Between two observers (three determinations each) 0,67 0,02 Between two laboratories (nine determinations each) 0,33 0,50 0
48、,05 0,01 The foregoing was based on observers and laboratories at the same level. When two or more laboratories wish to compare test results, it is recommended that laboratory level be established between them, through ratings of creases on fabrics of known history and performance. Differences great
49、er than the critical differences (on the same fabric, with the same washing and drying conditions) suggest differences in laboratory levels and indicate a need for removing such bias. A.3 Bias The true value of appearance of creases in items after home laundering can be defined only in terms of a test method. There is no independent method for determining the true value. BS ISO 7769:2006 blank BS ISO 7769:2006 BSI 389 Chiswick High Road London W4 4AL BSI British Standards Instit