1、BRITISH STANDARD BS 2782-6: Method 632A: 1993 ISO 4592:1992 Methods of testing Plastics Part 6: Dimensions properties Method 632A: Determination of length and width of flexible sheet IMPORTANT NOTE. Before reading this method it is essential to read BS 2782-0, Introduction, issued separately. UDC 67
2、8.5.8416:678.01:531.71BS2782-6:Method632A:1993 This British Standard, having been prepared under the directionof the Plastics and Rubber Standards Policy Committee, was published underthe authority of the Standards Board and comes intoeffect on 15 March 1993 BSI 08-1999 First published January 1982
3、Second edition March 1993 The following BSI references relate to the work on this standard: Committee reference PRM/75 Draft for comment 91/43610 DC ISBN 0 580 21659 4 Committees responsible for this British Standard The preparation of this British Standard was entrusted by the Plastics and Rubber S
4、tandards Policy Committee (PRM/-) to Technical Committee PRM/75, upon which the following bodies were represented: British Plastics Federation Her Majestys Stationery Office Institute of Trading Standards Administration Ministry of Defence Packaging and Industrial Films Association PIRA Internationa
5、l Amendments issued since publication Amd. No. Date CommentsBS2782-6:Method632A:1993 BSI 08-1999 i Contents Page Committees responsible Inside front cover National foreword ii 1 Scope 1 2 Reference method for determination of the length of a roll 1 3 Reference method for determination of the width o
6、f film and sheeting 2BS2782-6:Method632A:1993 ii BSI 08-1999 National foreword This British Standard has been prepared under the direction of the Plastics andRubber Standards Policy Committee and is identical with ISO4592:1992 Plastics Film and sheeting Determination of length and width, published b
7、ythe International Organization for Standardization (ISO). This standard supersedes BS 2782:Method 632A:1982 which is withdrawn. 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. Compli
8、ance 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, pages i and ii, pages1 and 2 and a back cover. This standard has been updated (see copyright date) and may have had amendments incorp
9、orated. This will be indicated in the amendment table on the inside front cover.BS2782-6:Method632A:1993 BSI 08-1999 1 1 Scope 1.1 This International Standard specifies a method for the determination of the “free” length of a roll of plastics film or sheeting(seeclause 2). This method is intended fo
10、r use with rolls of length up to100m as a reference method with which other methods may be checked. Any other method of determining the length may be used, provided that it gives the same result as the specified method. If automatic measuring devices are used, it is necessary that they be checked by
11、 measurements made in accordance with the specified procedure for each type of film or sheeting. Because the method is laborious it is permissible, in the case of long rolls, to check the other methods of measurement referred to above on an approximately100m length of film and sheeting measured by t
12、he specified method. 1.2 This International Standard also specifies a method for the determination of the average width of a roll and the width of a sample of plastics film or sheeting not less than5mm wide (see clause 3). If the width is only slightly greater than5mm, the accuracy of the method is
13、only2%. Two procedures are specified, their application depending on the width of the material. The method determines the “free” width of a roll of film or sheeting. This method is intended for use as a reference method with which other methods may be checked. Any other method of determining the wid
14、th may be used, provided that it gives the same result as the specified method. If automatic measuring devices are used, it is necessary that they be checked by measurements made in accordance with the specified procedures for each type of film or sheeting. 2 Reference method for determination of th
15、e length of a roll 2.1 Apparatus 2.1.1 Sharp knife or razor. 2.1.2 Metallic scale or profile, longer than the width of the roll to be measured. 2.1.3 Flat surface, preferably at least10m long and at least as wide as the roll to be measured. The surface shall be marked off in1m lengths along each lon
16、gitudinal edge, with at least one of these lengths at one end of the surface being subdivided into0,1 m divisions. 2.2 Procedure 2.2.1 Unroll the film or sheeting into lap form in such a way that the length of each lap does not exceed5m, and that there are no more than twenty laps directly one above
17、 the other. Allow the material to remain in this lap form for at least1h before the determination of length is carried out. 2.2.2 Take the uppermost cut end of the pile of material and pull it along the flat surface (2.1.3), taking care to ensure that only the minimum of stretch is applied to the ma
18、terial. NOTE 1One method of achieving this is to pass the film or sheeting over a roller mounted so as to rotate freely on ball bearings approximately30cm above the surface on which the material is to be measured. Make the cut end coincide with the zero mark on the surface, trimming the end if neces
19、sary by means of the sharp knife or razor (2.1.1) and metallic scale or profile (2.1.2), so that it is at right angles to the longitudinal direction of the roll, such trimming being confined to a minimum. At the opposite end of the surface, mark each edge of the material by some suitable method to c
20、oincide with a known division of length. 2.2.3 Move the material along the surface so that the marked portions coincide with the zero mark and repeat the marking process at the edges of the opposite end. 2.2.4 Repeat the process until the whole of the roll has been passed over the surface and measur
21、ed, trimming the last cut end, if necessary, in the same manner as the first cut end. 2.2.5 Measure the length to the nearest0,1m. Report the sum of all the measurements of length as the length of the roll, in metres, to the nearest0,1m. 2.3 Precision The precision of this test method is not known b
22、ecause inter-laboratory data are not available. When inter-laboratory data are obtained, a precision statement will be added at the subsequent revision. 2.4 Test report The test report shall include the following information: a) a reference to this International Standard; b) all information necessar
23、y for the complete identification of the tested roll; c) the length of the roll, in metres, to the nearest0,1 m.BS2782-6:Method632A:1993 2 BSI 08-1999 3 Reference method for determination of the width of film and sheeting Two different procedures are used depending on whether the width to be measure
24、d is greater or less than100mm. Use procedure A (3.1) for widths greater than100mm and procedure B (3.2) for widths from5mm up to 100mm. 3.1 Procedure A 3.1.1 Apparatus 3.1.1.1 Flat surface, at least as wide as the material to be measured. 3.1.1.2 Linear scale, subdivided into1mm divisions. 3.1.2 Me
25、asurement 3.1.2.1 Unroll the material into lap form, as specified in 2.2.1, and allow it to remain in this form for at least1h before measurements are made. In the case of non-rolled samples,30min conditioning is sufficient. 3.1.2.2 Lay the material on the flat surface (3.1.1.1) and place the scale
26、(3.1.1.2) on the material in such a manner that it is at right angles to the length direction of the material, with the zero mark on the scale aligned squarely with the left longitudinal edge of the material. Determine the exact position of the right edge of the material on the scale to the nearest1
27、mm and record the result. 3.1.2.3 The number of measurements to be made depends on the overall length of the roll or sample to be inspected. For lengths up to5m, determine the width at least three times along the sample length at approximately equal intervals. For lengths longer than5m, determine th
28、e width at least ten times along the length at approximately equal intervals. 3.1.2.4 Record each width measured and report the arithmetic mean as the average width of the roll or sample. 3.2 Procedure B 3.2.1 Apparatus 3.2.1.1 Flat surface, of width greater than100mm, across which a 100 mm linear s
29、cale subdivided into1mm divisions is finely marked, or flat surface of width greater than100mm and linear scale subdivided into1mm divisions. 3.2.1.2 Magnifying glass, giving 10 enlargement, having a graticule scale marked on the glass. 3.2.2 Measurement 3.2.2.1 Condition the sample as specified in
30、3.1.2.1 3.2.2.2 Align the zero mark of the scale squarely with the left longitudinal edge of the material, using the magnifying glass (3.2.1.2) to check proper alignment. By sliding the magnifying glass to the right, examine the position of the opposite edge of the material to check its position on
31、the flat reference scale. After reading the value of the last millimetre division nearest to the right-hand edge of the material, make the zero mark of the graticule scale scribed on the magnifying glass coincide with the last millimetre division of the reference scale, and measure the difference in
32、 width between this point and the right-hand edge of the material, in tenths of a millimetre, using the graticule scale. 3.2.2.3 The number of measurements to be made depends on the overall length of the roll or sample to be inspected. For lengths up to5m, determine the width at least three times at
33、 approximately equal intervals. For lengths longer than5m, determine the width at least ten times at approximately equal intervals. 3.3 Precision The precision of this test method is not known because inter-laboratory data are not available. When inter-laboratory data are obtained, a precision state
34、ment will be added at the subsequent revision. 3.4 Test report The test report shall include the following information: a) a reference to this International Standard; b) all information necessary for the complete identification of the sample; c) the overall length inspected; d) the widths recorded a
35、nd the average width.3 blankBS 2782-6: Method 632A: 1993 ISO 4592:1992 BSI 389 Chiswick High Road London W4 4AL BSIBritishStandardsInstitution BSI is the independent national body responsible for preparing BritishStandards. It presents the UK view on standards in Europe and at the international leve
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