1、BRITISH STANDARD BS7614:1992 ISO9961:1992 Specification for Natural tracing paper UDC 744.36:676.237BS7614:1992 This British Standard, having been prepared under the directionof the Paper and PrintingStandards Policy Committee, was published underthe authority of the Standards Board and comes intoef
2、fect on 15 November1992 BSI08-1999 The following BSI references relate to the work on this standard: Committee referencePAM/20 Draft for comment89/37511 DC ISBN 0 580 21283 1 Committees responsible for this British Standard The preparation of this British Standard was entrusted by the Paper and Prin
3、ting Standards Policy Committee (PAM/-) to Technical Committee PAM/20, upon which the following bodies were represented: British Paper and Board Industry Federation Drawing Office Material Manufacturers and Dealers Association HM Customs and Excise Her Majestys Stationery Office Amendments issued si
4、nce publication Amd. No. Date CommentsBS7614:1992 BSI 08-1999 i Contents Page Committees responsible Inside front cover National foreword ii 1 Scope 1 2 Normative references 1 3 Definitions 1 4 Requirements 1 5 Testing 2 6 Finished sizes 3 7 Packing and storage 4 8 Labelling 4 9 Test report 4 Annex
5、A (normative) Measurement of transparency using the reflectance method 6 Annex B (normative) Determination of tear growth resistance using the Brecht-Imset method 7 Figure 1 3 Figure 2 4 Figure B.1 9 Table 1 Physical properties 5 List of references Inside back coverBS7614:1992 ii BSI 08-1999 Nationa
6、l foreword This British Standard has been prepared under the direction of the Paper and Printing Standards Policy Committee. It is identical with ISO9961:1992 Draughting media for technical drawings Natural tracing paper, published by the International Organization for Standardization (ISO). Cross-r
7、eferences International Standard Corresponding British Standard ISO5-2:1991 BS1384 Photographic density measurements Part 2:1992 Specification for geometric conditions for transmission density a (Identical) ISO186:1985 BS3430:1986 Method for sampling to determine the average quality of paper and boa
8、rd (Identical) ISO187:1990 BS3431:1973 Method for the conditioning of paper and board for testing (Technically equivalent) ISO216:1975 BS4000 Sizes of paper and board Part1:1990 Specification for A and B series of trimmed sizes of writing paper and certain classes of printed matters (Identical) ISO5
9、36:1976 BS3432:1980 Method for determination of grammage of paper and board (Identical) ISO1974:1990 BS4468:1990 Method for determination of the internal tearing resistance of paper (Identical) ISO2469:1977 BS4432 Methods for determining optical properties of pulp, paper and board Part1:1980 Measure
10、ment of diffuse reflectance factor of paper, board and pulps (Identical) ISO4046:1978 BS3203:1979 Glossary of paper, board, pulp and related terms (Identical) ISO5457:1980 BS3429:1984 Specification for sizes of drawing sheets (Technically equivalent) ISO5630-1:1991 BS6388 Accelerated ageing of paper
11、 and board Part1:1991 Method for dry heat treatment at105 C (Identical) ISO8791-2:1990 BS4420:1990 Method for determination of the Bendtsen roughness of paper and board (Identical) a In preparation.BS7614:1992 BSI 08-1999 iii The Technical Committee has reviewed the provisions of IEC50(845), ISO217,
12、 ISO5627, ISO9175-1, ISO9175-2 and ISO9957-1 to which normative reference is made in the text, and has decided that they are acceptable for use in conjunction with this standard. BS4000-2:1983 Specification for untrimmed sizes is related to ISO217. A British Standard does not purport to include all
13、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 obligations. Summary of pages This document comprises a front cover, an inside front cover, pagesi to iv,
14、 pages1to10, 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 indicated in the amendment table on the inside front cover.iv blankBS7614:1992 BSI 08-1999 1 1 Scope This International Standard specifies th
15、e minimum requirements for draughting media made from natural tracing paper. It details qualities necessary for draughting and reproduction, and specifies appropriate test methods for the most commonly used grammages within the range40g/m 2 to160g/m 2i.e.62,5g/m 2 ,72,5g/m 2 ,92,5g/m 2and112,5g/m 2
16、. 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 based on th
17、is 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. ISO5-2:1991, Photography Density measurements Part2: Geometric conditio
18、ns for transmission density. ISO186:1985, Paper and board Sampling to determine average quality. ISO187:1990, Paper, board and pulps Standard atmosphere for conditioning and testing and procedure for monitoring the atmosphere and conditioning of samples. ISO216:1975, Writing paper and certain classe
19、s of printed matter Trimmed sizes A and B series. ISO217:1974, Unprocessed writing and printing paper Method of expression of dimensions and direction of manufacture. ISO536:1976, Paper and board Determination of grammage. ISO1974:1990, Paper Determination of tearing resistance (Elmendorf method). I
20、SO2469:1977, Paper, board and pulps Measurement of diffuse reflectance factor. ISO4046:1978, Paper, board, pulp and related terms Vocabulary. ISO5457:1980, Technical drawings Sizes and layout of drawing sheets. ISO5627:1984, Paper and board Determination of smoothness (Bekk method). ISO5630-1:1991,
21、Paper and board Accelerated ageing Part1: Dry heat treatment at105 C. ISO8791-2:1990, Paper and board Determination of roughness/smoothness (air leak methods) Part2: Bendtsen method. ISO9175-1:1988, Tubular tips for hand-held technical pens using India ink on tracing paper Part1: Definitions, dimens
22、ions, designation and marking. ISO9175-2:1988, Tubular tips for hand-held technical pens using India ink on tracing paper Part2: Performance, test parameters and test conditions. ISO9957-1:, Fluid draughting media Part1:Water-based India ink Requirements and test conditions 1) . IEC50(845):1987, Int
23、ernational Electrotechnical Vocabulary Chapter845: Lighting. 3 Definitions For the purposes of this International Standard, the definitions given in ISO4046 and the following definition apply. 3.1 natural tracing paper drawing paper for use with ink and/or pencil, the translucency of which is achiev
24、ed by mechanical treatment during the manufacturing process 4 Requirements 4.1 Appearance and cleanness The appearance of the paper when viewed using transmitted light shall be uniform throughout. The paper shall be free from dirt spots, wrinkles, pin holes and other defects which may affect its use
25、. 4.2 Grammages Grammages, determined in accordance with ISO536, shall be as shown in Table 1. 4.3 Transparency Transparency, determined in accordance with5.3, shall be as shown in Table 1. 4.4 Draughting quality 4.4.1 Draughting quality using tubular technical pens Draughting quality with India ink
26、 is of interest only for smooth papers. NOTE 1Depending on the surface characteristics of the tracing paper and the type of eraser, a reduced contrast between the ink line and the natural tracing paper to be tested may occur where lines made using black leads have been removed. 1) To be published.BS
27、7614:1992 2 BSI 08-1999 A line of nominal width0,35mm, drawn using a tubular technical pen in accordance with ISO9175-1, and using India ink complying with ISO9957-1 and recommended by the manufacturer, on natural tracing paper complying with this International Standard, shall have a tolerance of 10
28、%( 0,04mm) of its nominal width after the ink has dried (see the table in ISO9175-2:1988). The draughting quality shall be tested as described in5.4. NOTE 2At present it is not possible to determine the draughting quality for pencils. 4.4.2 Redraughting quality using tubular technical pens Correctio
29、ns change the surface of tracing paper. The thickness of ink lines in corrected areas is therefore allowed to differ by up to10% from line thicknesses in uncorrected areas. Ink lines shall nonetheless fulfil the above requirement for at least the minimum number of corrections given in Table 1. The m
30、inimum number of corrections given in Table 1 applies to erasure by any method recommended by the tracing paper manufacturer or retailer. The redraughting quality shall be tested as described in5.4. 4.5 Surface characteristics (smoothness/roughness) Natural tracing papers are classified as smooth or
31、 matt according to their surface characteristics. Tests carried out in accordance with ISO8791-2 or ISO5627 shall give the values specified in Table 1. 4.6 Tearing resistance The tearing resistance determined using either the Elmendorf method (see ISO1974) or the Brecht-Imset method (see Annex B) sh
32、all comply with the values specified in Table 1. NOTE 3The Elmendorf and Brecht-Imset methods are alternative methods. 4.7 Resistance to ageing Natural tracing paper shall have good ageing properties when correctly stored. When aged in accordance with ISO5630-1, the tearing resistance shall be not l
33、ess than70% of the previous value. NOTE 4The transparency loss on ageing may be considered in a future revision of this International Standard. NOTE 5During storage the quality of natural tracing paper may be influenced by temperature and/or humidity. Under normal conditions, natural tracing paper c
34、an be expected to remain usable for a minimum of10years. 5 Testing 5.1 Sampling Samples shall be taken in accordance with ISO186. 5.2 Conditioning and testing of samples Where appropriate to the test method, samples shall be conditioned and tested in accordance with the preferred atmosphere given in
35、 ISO187 (23 1) C and(50 2)% relative humidity. 5.3 Transparency 5.3.1 General The transparency of natural tracing paper shall be determined either by a transmission method using a densitometer designed to read ISO diffuse visual transmission density, as defined in ISO5-2, or by a reflectance method
36、using a reflectometer complying with ISO2469. Measurements shall be made with a specified light source to determine the transparency to total light and with a UV filter (Wratten18A 2)or equivalent) between the test piece or test sample and the photo cell to determine the transparency to UV light. 5.
37、3.2 Transmission method 5.3.2.1 Apparatus 5.3.2.1.1 Densitometer, complying with ISO5-2 and fitted with a light source complying with standard CIE illuminant D 65described in IEC50(845-03-12) and a UV filter as described in5.3.1. 5.3.2.2 Procedure Set up the apparatus in accordance with the manufact
38、urers instructions. Make two measurements on each test sample and record the results (total light). Place the UV filter between the test sample and the photo cell, make two measurements on each test sample and record the results (UV light). 5.3.2.3 Expression of results Calculate the mean and standa
39、rd deviation for total light and for UV light and report the results to two significant figures. 5.3.3 Reflectance method Carry out the determination in accordance with Annex A. 2) Wratten18A is an example of a suitable product available commercially. This information is given for the convenience of
40、 users of this International Standard and does not constitute an endorsement by ISO of this product.BS7614:1992 BSI 08-1999 3 5.4 Draughting quality 5.4.1 Draughting quality using tubular technical pens 5.4.1.1 Apparatus 5.4.1.1.1 Tubular technical pen, complying with ISO9175-1, with a nominal line
41、width of0,35mm. The pen shall be prepared for use in accordance with the manufacturers recommendations (i.e.forcleaning, kind of draughting fluid complyingwith ISO9957-1 to be used, method of filling, etc.). 5.4.1.1.2 Test machine, comprising an electro-mechanical line-draughting device with adjusta
42、ble writing angle, writing head and line pitch. 3) 5.4.1.1.3 Microscope, with a micrometer scale in the ocular, or a projector microscope, with a minimum accuracy of0,01mm. 5.4.1.2 Procedure Testing shall be carried out at a temperature of(23 1) C and a relative humidity of(50 2)%. The line-draughti
43、ng device settings shall be as follows: angle of contact:87 writing force on the tips:0,2N draughting speed:(5 0,3)cm/s Ensure that the test sample is free from surface contamination. Draw five lines, at least150mm long, on each test sample. Allow the ink to dry for5min and examine the lines for con
44、tinuity. If any line is interrupted, reject the sample. Two further attempts are allowed with samples from the same batch. If all these samples fail, the draughting quality shall be considered unacceptable. The line width shall be measured in the middle third of each of the five lines. Use preferabl
45、y a single-barrel measuring microscope with a light source above and 30 magnification. Measure each line twice in the same spot. Refocus the microscope each time in order to remove inaccuracies due to possible movement in the screw mechanism. Take care when measuring to centre the measuring head ove
46、r the middle contour of the line edge (see Figure 1). Report the line width as the average of the10measurements, rounded to the nearest0,01mm. 5.4.2 Redraughting quality using tubular technical pens Draw by hand on the test sample an ink line of minimum length50mm using a tubular technical pen of no
47、minal line width0,35mm complying with ISO9175-1. After allowing the ink to dry for atleast5min, erase a section of approximately30mm completely from the centre of the line using any erasure technique recommended by the tracing paper manufacturer or retailer. The success in drawing over erasures depe
48、nds partly on suitable after-treatment of the place of erasure. A recommended after-treatment is to rub gently the erased area with a chamois leather or a soft plastic eraser to remove any minute particles of debris that could lead to feathering of the drawn lines constituting the corrections. Draw
49、lines over the same place according to the pattern of correction given in Figure 2. 6 Finished sizes 6.1 Sheet sizes Sheet sizes shall comply with ISO216 or ISO5457. 6.2 Rolls Tolerances on the width shall be as follows: a) for widths up to and including150mm: 1,5mm b) for widths greater than150mm and up to and including600mm: 2mm c) for widths greater than600mm: 3mm The paper length shall be not less than the specified length. 3) Address of the only known present supplier of such a test machine: Rotring-Werke, Kieler Str.30
