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1、5 P 1 JAPANESE I N D U STR I AL STANDARD Translated and Published by Japanese Standards Association Paper and board - Determination of water absorptiveness - Cobb method ICs 85.060 Descriptors : paper, board (paper), water-absorption tests Reference number : JIS P 8140 : 1998 (E) 5 s Copyright Japan
2、ese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/11/2007 07:42:17 MDTNo reproduction or networking permitted without license from IHS -,-,- STD-JIS P 8140-ENGL 1998 Y933bUA 0553570 874 H P 8140 : 1998 Foreword Thi
3、s translation has been made based on the original Japanese Industrial Standard revised by the Minister of International Trade and Industry through deliberations at Japanese Industrial Standards Committee in accordance with the Industrial Standardization Law. Consequently JIS P 8140:1976 is replaced
4、with JIS P 8140:1998. This revision is made for conformity with IS0 636 :1991, Paper and board - Determination of water absorptiveness - Cobb method. Date of Establishment: 1964-02-01 Date of Revision: 1998-01-20 Date of Public Notice in Official Gazette: 1998-01-20 Investigated by: Japanese Industr
5、ial Standards Committee Divisional Council on Consumer Life JIS P 8140:1998, First English edition published in 1999-02 Translated and published by: Japanese Standards Association 4-1-24, Akasaka, Minato-ku, Tokyo, 107-8440 JAPAN In the event of any doubts arising as to the contents, the original JI
6、S is to be the final authority. O JSA 1999 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from the publisher. Printed
7、 in Japan Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/11/2007 07:42:17 MDTNo reproduction or networking permitted without license from IHS -,-,- STD-JIS P 81LiO-ENGL 1978 I I Li733b08 0553571 7
8、00 c I JAPANESE INDUSTRIAL STANDARD JIS P 8140: 1998 Paper and board- Determination of water absorptiveness- Cobb method Introduction This Japanese Industrial Standard has been prepared based on the second edition of IS0 535, Paper and board - Determination of water absorptiveness- Cobb method, with
9、out any modification in technical content, except below stated specified content. Summary of different points on specified content 0 Standards in JIS are supplemented in normative references. The definition on contact time is supplemented. 0 The figures of apparatus and implements (an example of tes
10、ter) are supplemented. The range of gram- mage of blotting paper for apparatus and implements is enlarged. For sampling of test pieces, the method stated in JIS is supplemented. 8 When making pretreatment of test piece, the method stated in JIS is supplemented. 0 In procedures, standard conditions i
11、n JIS are supplemented. The number of times of test trials is clearly specified in procedures. In this Standard, the places underlined with dotted line are those which are not mentioned in corresponding International Standard. 1 This Japanese Industrial Standard specifies the testing method for wate
12、r absorp- tiveness of paper and board when one surface of non-absorptive paper and board is exposed to water for a specified period of time. Scope 2 Normative references The following standards contain provisions which, through reference in this Standard, constitute provisions of this Stnadard. As t
13、o those normative references, the most recent editions (containing Amendments) shall be applied. JIS P O001 Glossary of terms used in pulps and papers industry _ JIS P 81 10 Paper _._._-. and board - Samfllingfor-tesLzng ._._. _. _._._._. _. _ _ _. _ _._-_._-_-_.-. JIS p 81 1 1 Conditioning-ofaer-ca
14、nbaerb.oard-or-test JIS Z 8401 JIS Z 9041 IS0 186 Paper and board - Sampling for testing IS0 187 Paper, board and pulps - Standard atmosphere for conditioning and testing and procedure for monitoring the atmosphere and conditioning of samples Rules for rounding offof numerical values Presentation an
15、d reduction of data ._._-_-_ _._.-.-.- - -_-_._._.-. . _._ Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/11/2007 07:42:17 MDTNo reproduction or networking permitted without license from IHS -,-,-
16、 STD-JIS P AL40-ENGL 1798 4933b08 0553572 bi7 2 P 8140 : 1998 3 Definitions For the purposes of this Standard, thedefnonsnJISPOOOl.ap!, and the rest of the terms as follows. a) water absorptiveness (Cobb value) The calculated mass of water absorbed in a specified time by 1 m2 of paper or board under
17、 specified conditions. Informative reference : The area for test, generally, is about 100 cm. b) time for contact The duration from the instant when a test piece touches with water to ._._-.-.-.-. _._._ the instant when blotting-paeybegns-toabsorb W? specification ; piece; and water is put. Notes ()
18、 () Even when using the cylinder with small area, it is recommended that this should not be less than 50 cm. When leakage between the cylinder and the upper surface of the test piece may occur, a soft, elastic, and non-sbsorbent gasket is interposed to prevent this. Copyright Japanese Standards Asso
19、ciation Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/11/2007 07:42:17 MDTNo reproduction or networking permitted without license from IHS -,-,- STD-JIS P B14D-ENGL 1998 4933b08 0553573 583 m 3 P 8140 : 1998 Unit: mm Fig. 1 Example of a
20、bsorptiveness tester b) c) Balance With accuracy of 1 mg. d) Timer e) Metal roller With a smooth surface, measuring 200 m m in width and 90 mmk 10 mm in diameter, and 10 kgk 0.5 kg in mass. Reading in seconds, and capable of timing up to at least 30 min. Graduating cylinder Measuring cylinder or oth
21、er means of measuring appropriate aliquots. Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/11/2007 07:42:17 MDTNo reproduction or networking permitted without license from IHS -,-,- 4 P 8140 : 199
22、8 Symbol Cobbw, Cobbm Cobbm Cobbm Cobbim f) Blotting paper With a grammage from 225 g/m2 to 340 g/m. g) Water Distilled water or deionized water. Times at which water is removed Times at which blotting is carried out S S 20t- 1 302 1 45k 1 60+2 10522 120I2 300 k 2 285 2 2 1 755 to 1 815 i5 I 2 after
23、 removing excess water 5 Test piece Test pieces shall be taken from the test paper which was sampled according to the method specified in _._-_-. JIS P 8110 or IS0 186. Pretreat the test paper under the standard condition specified in-JJS-F-Slll-or IS0 187, and cut test pieces into sufficient size t
24、o exceed the diameter of the cylinder by at least 10 mm from any edge, with avoiding unusual places such as creased or with wrinkles. Keep the test pieces lest hands or fingers should touch the place to be tested, and avoiding from folds, creases, cracks or other defects. 6 Operation Operation shall
25、 be carried out under the standard conditions specified in JIS _-_._- P 8111 or IS0 187. The temperature of water for test shall be the same with that at standard condition for test. Dry the edge of a cylinder where the test piece will touch, and dry also the surface of a rigid base. Measure the mas
26、s of the test piece to the nearest 1 mg, and place it on the rigid base with face to be tested upward. Place the finished edge of the cylinder on the target surface of the test piece, and fix sufficiently with a clamp so as not to leak water between the test piece and cylinder. Pour 100 ml+ 5 ml of
27、water (when 100 cm2 test area was taken) into the cylinder to make 10mm water depth. Simultaneously, start a timer. Use new water every time test is carried out. After the timer runs, within the “Time at which excess water is removed” specified in Table 1, pour off the excess water kept in the cylin
28、der taking care not to moisten place other than the area to be tested. Quickly unclamped the cylinder from the test piece, put the test piece on a dried blotting paper previously placed on a flat hard base, with the tested surface upward. Within the “Time at which blotting is carried out” specified
29、in Table 1, place a dried blotting paper on the test piece. Using a metal roller, roil it two rollings (one recipro- cating motion) without applying any pressure, to eliminate excess water. Immediately after blotting, fold the test piece with the wet side inside, and weigh swiftly its mass to the ne
30、arest 1 mg. Table 1 Test times Recommended time of contact S 30 60 1 20 300 1 800 f) Times of test trials Five times or more shall be carried out respectively on surface and Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, B
31、ernie Not for Resale, 03/11/2007 07:42:17 MDTNo reproduction or networking permitted without license from IHS -,-,- STD=JIS P BLiO-ENGL 1778 W 4933b08 0553575 35L W 5 P 8140 : 1998 back surface of the test piece. shall be rejected. g) Rejection of test pieces The test pieces, which has conditions as
32、 follows after test, 1) Test pieces through which water has penetrated When 20 % or more test pieces have got the penetration of water, lessen the time for contact. 2) When the trace of water leakage is found around the place where cylinder makes pressure. 3) After blotting, excess water is found on
33、 the test piece (judge it owing to the gloss shown on the surface). Remarks: When test pieces are rejected, increase the number of tests so that the test Informative reference : If reduced time of contact cannot give satisfactory test results, results of 5 times or more shall be obtained. the sample
34、 shall not suit to this test. 7 Calculation The calculation of absorptiveness shall be as follows. where, A : absorptiveness (Cobb value) (g/mz) m I : dry mass of test piece (g) mz : wet mass of test piece (g) F : 10 OOO/S S : test area (cm2) 8 Expression of test results Absorptiveness shall beounde
35、dofftoonedecimalplace _. according _-_.- to the method specified _._._.-.I-_- in JIS Z 8401. The average absorptiveness shall be ._- method specified _-_-_-_-_-_-_ in JIS Z 9041. Marking method of absorptiveness (Cobb value), for instance, shall be as follows in case oft O C temperature and 60 secon
36、ds of contact time. expressed with the unit of 0.5 g/m2 Y and- he-standard-devaon ! ? % exP_seb-accordln. ! ! ? - the Cobbm (A) t O C 9 Test report The test report shall include the following information as occasions re- quired. a) Title of Standard or number of Standard, and either JIS or IS0 stand
37、ard b) Kind and name of test piece c) Year, month and day of test, and location where test was carried out d) Conditions for pretreatment of test piece (temperature and humidity) e) Tested side of test piece (surface or back surface) f) Contact time Copyright Japanese Standards Association Provided
38、by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/11/2007 07:42:17 MDTNo reproduction or networking permitted without license from IHS -,-,- STD-JIS P 8140-ENGL 1778 Y733bfl8 055357b 292 6. P 8140 : 1998 Number of test pieces adopted Number of rejec
39、ted test pieces and the cause of the rejection Averaged value, themaximum-v-al-uey-minimu.m-va!ue, and standard deviation Test area (when test area is other than 100 cm) Other information to be needed Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employe
40、es/1111111001, User=Wing, Bernie Not for Resale, 03/11/2007 07:42:17 MDTNo reproduction or networking permitted without license from IHS -,-,- STD-JIS P 8140-ENGL 1998 4933bDA 0553577 129 Errata for JIS (English edition) are printed in Standardization Journal, published monthly by the Japanese Stand
41、ards Association, and also provided to subscribers of JIS (English edition) in Monthly Information. Errata will be provided upon request, please contact: Standardization Promotion Department, Japanese Standards Association 4-1-24, Akasaka, Minato-ku, Tokyo, 107-8440 JAPAN TEL. 03-3583-8002 FAX. 03-3583-0462 Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/11/2007 07:42:17 MDTNo reproduction or networking permitted without license from IHS -,-,-