BS 5881-1980 Method for determination of grammage of single layers of solid fibreboard《单层实心纤维板重量测定方法》.pdf

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1、BRITISH STANDARD BS 5881:1980 ISO 5638:1978 Method for Determination of grammage of single layers of solid fibreboard ISO title: Solid fibreboard Determination of grammage of single layers UDC 676.28415.017.25BS5881:1980 This British Standard, having been prepared under the directionof the Paper Sta

2、ndards Committee, was published underthe authority of the Executive Board and comes intoeffect on 29 February 1980 BSI 12-1999 The following BSI references relate to the work on this standard: Committee reference PAS/11 Draft for comment 77/60825 DC ISBN 0 580 11201 2 Cooperating organizations The P

3、aper Standards Committee, under whose direction this British Standard was prepared, consists of representatives from the following Government department and professional and industrial organizations: British Paper and Board Industry Federation (PIF)* British Printing Industries Federation* Envelope

4、Makers and Manufacturing Stationers Association* Her Majestys Stationery Office* Institute of Trading Standards Administration National Association of Paper Merchants Pira (The Research Association for the Paper and Board, Printing and Packaging Industries)* Royal Institute of Public Health and Hygi

5、ene The organizations marked with an asterisk in the above list, together with the following, were directly represented on the committee entrusted with the preparation of this British Standard: British Wood Pulp Association Chemical Industries Association Fibreboard Packing Case Manufacturers Associ

6、ation Man-made Fibres Producers Committee Ministry of Defence Post Office Society of British Printing Ink Manufacturers University of Manchester, Institute of Science and Technology Amendments issued since publication Amd. No. Date of issue CommentsBS5881:1980 BSI 12-1999 i Contents Page Cooperating

7、 organizations Inside front cover National foreword ii 1 Scope 1 2 Field of application 1 3 References 1 4 Apparatus 1 5 Reagent 1 6 Sampling 1 7 Procedure 1 8 Expression of results 2 9 Precision 2 10 Test report 2 Publications referred to Inside back coverBS5881:1980 ii BSI 12-1999 National forewor

8、d This British Standard has been prepared under the direction of the Paper Standards Committee. It is identical withISO5638 “Solid fibreboard Determination of grammage of single layers” which was developed by Technical Committee ISO/TC 6, Paper, board and pulps, and was published by the Internationa

9、l Organization for Standardization (ISO). Terminology and conventions. The text of the International Standard has been approved as suitable for publication, without deviation, as a British Standard. Some terminology and certain conventions are not identical with those used in British Standards; atte

10、ntion is especially drawn to the following. Wherever the words “International Standard” appear, referring to this standard, they should be read as “British Standard”. The comma has been used throughout as a decimal marker. In British Standards it is current practice to use a full point on the baseli

11、ne as the decimal marker. Additional information. The footnote to the last item in clause3 is no longer applicable asISO4046 has been published. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct app

12、lication. Compliance with a British Standard does not of itself confer immunity from legal obligations. Cross-references International Standard Corresponding British Standard ISO 186:1977 BS 3430:1980 Method for sampling for testing paper and board (Identical) ISO 187:1977 BS 3431:1973 Method for th

13、e conditioning of paper and board for testing (Technically equivalent) ISO 4046:1978 BS 3203:1979 Glossary of paper, board, pulp and related terms (Identical) Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, pages1 and 2, an inside back cover and a back

14、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.BS5881:1980 BSI 12-1999 1 1 Scope This International Standard specifies a method for determining the grammage of single layers

15、of glued and laminated solid fibreboard. 2 Field of application This method is applicable to all types of solid fibreboard (as defined inISO4046), provided that the adhesive dissolves under the conditions specified for the test. 3 References ISO 186, Paper and board Sampling for testing. ISO 187, Pa

16、per and board Conditioning of test samples. ISO 4046, Paper, board, pulp and related terms Vocabulary 1) . 4 Apparatus 4.1 Cutting device, capable of repeatedly cutting out test pieces95% of which have an area within1% of a known area. When this cutting accuracy has been confirmed (see4.5.1), use th

17、e mean area for calculation of the grammage in subsequent tests on the same type of board. Check the accuracy of the cutting device frequently and always when the type of board tested is changed. If the cutting accuracy specified above cannot be achieved (as is likely with certain types of board), i

18、t is essential that the area of every test piece be determined individually, by linear measurement accurate to0,2%. 4.2 Weighing device, sufficiently accurate over the range of mass for which it is used, to measure to within0,5% of the actual mass. It shall be able to detect a change of 0,2% of the

19、mass to be weighed and, if the device is of the direct-reading type, it shall be graduated so that readings may be taken to this degree of accuracy. For checking of the weighing device, see4.5.2. 4.3 Submersion tank, large enough to hold10test pieces250 mm 250mm submerged vertically in a rack for we

20、tting. 4.4 Drying chamber, having natural or forced air circulation for an air temperature of105 2 C. 4.5 Calibration of apparatus 4.5.1 Checking of cutting device Measure20test pieces and calculate their areas. The cutting accuracy specified in4.1. is attained when the standard deviation of the ind

21、ividual areas is less than0,5% of the mean area. 4.5.2 Checking of weighing device Check the weighing device frequently by applying accurately measured masses with both increasing and decreasing loads. 5 Reagent Distilled or deionized water, normally at the temperature of the test room. The pH value

22、 of the water at the beginning of each test shall be7 1at a temperature in accordance withISO187. 6 Sampling Select specimens in accordance withISO186. 7 Procedure 7.1 Conditioning before cutting Condition the specimens in accordance withISO187. 7.2 Preparation of test pieces From the conditioned sp

23、ecimens cut at least10test pieces, normally 250mm 250mm, to the precision specified in4.1. NOTEIf necessary, smaller test pieces may be used, down to a minimum dimension of100mm in the cross direction and a minimum area of0,01m 2(but maintaining the specified precision of cutting and weighing). If t

24、he area of each test piece is less than 0,05m 2 , report the test piece dimensions. If the grammage of the board is to be determined, weigh the test pieces before delamination. 7.3 Delamination Immerse the test pieces in water (see clause5) until the layers can be separated from one another without

25、fibres being torn. NOTEIf the board is water-resistant, it may be necessary to heat the water (after checking its pH value) to about80 C. 7.4 Removal of adhesive Adhesive showing on the surface of a layer and not absorbed into the layer should be removed by careful washing with distilled or deionize

26、d water (see clause5). NOTEComplete removal of the absorbed adhesive cannot be expected. Removal of fibre from the layer is to be avoided. 7.5 Drying of delaminated board Dry the individual layers at105 2 C, to constant mass (i.e.when two weighings, at least2h apart, do not differ by more than0,5%).

27、 7.6 Conditioning of delaminated board Condition the individual layers after drying, in accordance withISO187. 1) At present at the stage of draft.BS5881:1980 2 BSI 12-1999 7.7 Weighing of delaminated board After conditioning, weigh each layer of each test piece individually. 8 Expression of results

28、 Calculate the grammage, in grams per square metre, of a single layer using the formula: where m is the mean mass, in grams, of the conditioned layer of a test piece; A is the mean area of the test pieces, in square metres. 9 Precision No information is at present available on the repeatability or r

29、eproducibility of this method. NOTEWhere10test pieces of area less than0,05m 2each are used (as permitted in the note to7.2), the repeatability and reproducibility may be less than those obtained with test pieces of size 250mm 250mm, owing to the variability of grammage within the sample. 10 Test re

30、port The test report shall give the following particulars: a) reference to this International Standard; b) type and origin of the solid fibreboard; c) number of test pieces; d) the conditioning atmosphere used; e) description of single layers; f) grammage of single layers, mean value; g) place and d

31、ate of testing; h) details of any operations that are optional or not covered in this International Standard, and any other features that may have affected the results. m A -BS5881:1980 BSI 12-1999 Publications referred to See national foreword.BS 5881:1980 ISO 5638:1978 BSI 389 Chiswick High Road L

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