1、BRITISH STANDARD BS7305:1990 Method for Determination of the maximum safe ironing temperature of fabricsBS7305:1990 This BritishStandard having beenprepared under the directionof theTextiles andClothing Standards PolicyCommittee, was publishedunder the authorityofthe Board of BSI andcomes into effec
2、t on 31August1990 BSI12-1999 The following BSI references relate to the work on this standard: Committee reference TCM/25 Draft for comment85/43217 DC ISBN 0 580 18367 X Committees responsible for this BritishStandard The preparation of this BritishStandard was entrusted by the Textiles and Clothing
3、 Standards Policy Committee (TCM/-) to Technical Committee TCM/25, upon which the following bodies were represented: British Interlining Manufacturers Association Home Laundering Consultative Council International Wool Secretariat Lambeg Industrial Research Association Man-made Fibres Producers Comm
4、ittee Ministry of Defence Soap and Detergent Industry Association Textile Research Council (Fcra) Amendments issued since publication Amd. No. Date of issue CommentsBS7305:1990 BSI 12-1999 i Contents Page Committees responsible Inside front cover Foreword ii 1 Scope 1 2 Principle 1 3 Definition 1 4
5、Apparatus 1 5 Conditioning and testing atmosphere 1 6 Specimens 1 7 Procedure 1 8 Expression of results 1 9 Test report 2 Publications referred to Inside back coverBS7305:1990 ii BSI 12-1999 Foreword This BritishStandard has been prepared under the direction of the Textiles and Clothing Standards Po
6、licy Committee. A method for determining the maximum safe ironing temperature for fabrics was included as Appendix C in BS2747:1980. A decision has now been taken to publish this method as a separate BritishStandard. This method is intended for classifying fabrics for ironing purposes. Fabrics may b
7、e labelled in accordance with BS2747 in terms of the test temperatures they will withstand as follows: up to200 C (hot iron), three dots up to150 C (warm iron), two dots up to110 C (cool iron), one dot This test determines the highest setting at which a fabric may be ironed without actual fibre or f
8、abric damage occurring. It does not take into account slight thermal shrinkage that can occur with some thermoplastic fibres, which may require a fabric to be ironed at a lower setting than the one obtained from the test. Where this factor is significant it can be taken into consideration in assessi
9、ng the recommended iron setting. The test is not intended to determine colour fastness properties but any significant change below the maximum safe ironing temperature should be noted. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standar
10、ds are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pagesi andii, pages1 and2, an inside back cover and a back cover. This standa
11、rd has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover.BS7305:1990 BSI 12-1999 1 1 Scope This BritishStandard describes a method for determining the maximum safe ironing temperature of fabrics. NOTETh
12、e titles of the publications referred to in this standard are listed on the inside back cover. 2 Principle Fabric specimens are pressed with a heated aluminium block at increasing temperatures and examined for changes in handle and appearance. 3 Definition For the purposes of this BritishStandard th
13、e following definition applies. maximum safe ironing temperature the highest temperature at which no sticking, discolouration, glazing, stiffening or other changes in handle or appearance of a textile fabric occurs 4 Apparatus 4.1 Aluminium block, 100mm in diameter and50mm deep with a hole in the ce
14、ntre,7mm diameter and40mm deep, perpendicular to the upper flat face. The block is fitted with a carrying handle, and the total mass of the block plus handle is1150 20g. The base shall have a matt finish and be unpolished 1) . 4.2 Means for heating the aluminium block, other than a naked flame, e.g.
15、an electric hot plate. 4.3 0 C to 360 C mercury in glass thermometer. 4.4 Silicone grease or Woods metal 4.5 Insulating sheet 4.6 Horizontal ironing board, covered by one layer of6mm thick felt and two layers of cotton fabric. 5 Conditioning and testing atmosphere The standard temperate atmosphere f
16、or testing textiles, as defined in BS1051, shall be used for conditioning and testing, i.e.an atmosphere having a temperature of20 2 C and a relative humidity of65 2%. 6 Specimens Cut one specimen, preferably15cm 15cm, of the fabric to be tested, for each temperature level chosen. 7 Procedure Expose
17、 the specimens in the conditioning and testing atmosphere (see clause5) for not less than16h. Place the thermometer (see4.3) in the hole in the aluminium block (see4.1) lubricated with silicone grease or Woods metal for good thermal contact. Perform the first test at a safe low temperature (seeforew
18、ord). Heat the block to a temperature at least5 C above that required for the test. Place the block on the insulating sheet and when the thermometer indicates the desired temperature immediately transfer the block to the specimen resting on the ironing board (see4.6) and leave it for30s. If the size
19、 of the specimen is less than15cm 15cm, the block shall be placed on it to cover about one half of the area of the specimen. Raise the block and if the specimen sticks to the base, remove it. Allow the specimen to cool. Assess the specimen for discoloration, glazing, stiffening or other changes in h
20、andle or appearance. In the case of a slight discoloration allow the specimen to condition for24h and then re-examine it. The assessments are subjective and the following points shall be noted. a) Lowest temperature at which any change occurs, with details of the nature of the change. b) Lowest temp
21、erature at which glazing occurs. c) Lowest temperature at which stiffening occurs. d) Lowest temperature at which transparency occurs (usually for acetates and fine polyamide fabrics). e) Lowest temperature at which flattening occurs. NOTEBy viewing the test area with low-angle light, differences ma
22、y be more readily seen, but deciding when stiffening, etc. has occurred does require some practice. Glazing will show up more easily when viewed from the angle of specular reflection. Surface flattening is one of the problem assessments because the test is on a small area, which stands out, but if t
23、he whole specimen is ironed slight flattening may not be noted. Repeat the test on other specimens or an unused portion of the specimen to determine the maximum temperature at which no sticking, discoloration, stiffening or other changes in handle or appearance occur. Tests shall be carried out at t
24、emperatures with10 C intervals. Record any significant change in colour below the maximum safe ironing temperature. 8 Expression of results Express the maximum safe ironing temperature of the textile in C. 1) A suitable finish can be obtained using150grit size aluminium oxide abrasive paper either b
25、y hand or on a finishing machine.BS7305:1990 2 BSI 12-1999 9 Test report The test report shall include the following particulars: a) the number and date of this BritishStandard, i.e.BS7305:1990; b) details of the textile tested; c) the result obtained expressed as in clause8; d) whether any signific
26、ant change in colour occurred below the maximum safe ironing temperature.BS7305:1990 BSI 12-1999 Publications referred to BS1051, Glossary of terms relating to the conditioning, testing and mass determination of textiles. BS2747, Code of practice on textile care labelling 2) . 2) Referred to in the
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