1、BRITISH STANDARD BS4781:1990 Specification for Pressure-sensitive adhesive plastics labels for permanent use UDC 676.811.32 036.5:678.5BS4781:1990 This British Standard, having been prepared under the directionof the Paper and PrintingStandards Policy Committee, was published underthe authority of t
2、he BoardofBSI and comesintoeffecton 31July1990 BSI 03-1999 First published as BS4781-1:1973, July1973 and BS4781-2:1979, October1979 Second edition July1990 The following BSI references relate to the work on this standard: Committee reference PAM/37 Draft for comment88/38368DC ISBN 0 580 182762 Comm
3、ittees responsible for this British Standard The preparation of this British Standard was entrusted by the Paper and Printing Standards Policy Committee (PAM/-) to Technical Committee PAM/37 upon which the following bodies were represented: Adhesive Tape Manufacturers Association Association of Name
4、 Plate Manufacturers Limited British Adhesives and Sealants Association British Paper and Board Industry Federation British Railways Board Fasson Products UK Her Majestys Stationery Office Ministry of Defence Pressure Sensitive Manufacturers Association Amendments issued since publication Amd. No. D
5、ate of issue CommentsBS4781:1990 BSI 03-1999 i Contents Page Committees responsible Inside front cover Foreword ii 1 Scope 1 2 Definitions 1 3 Performance 1 4 Storage 2 5 Marking 2 Appendix A Methods of test 3 Table 1 Designations for resistance to temperature variation 2 Table 2 Resistance to tempe
6、rature variation: test conditions 5 Publications referred to Inside back coverBS4781:1990 ii BSI 03-1999 Foreword This British Standard has been prepared under the direction of the Paper and Printing Standards Policy Committee. It combines the requirements of BS4781-1:1973 and BS4781-2:1979 and spec
7、ifies higher adhesion values to take account of the better performance of modern pressure-sensitive adhesives. It specifies float glass and aluminium foil as the test substrates and makes use of a modified cleaning procedure to prepare the float glass substrate. It supersedes BS4781-1:1973 and BS478
8、1-2:79, which are withdrawn. This specification calls for the use of substances and/or test procedures that may be injurious to health if adequate precautions are not taken. It refers only to technical suitability and in no way absolves the user of this standard from statutory obligations relating t
9、o health and safety at any stage of manufacture or use. In particular, attention is drawn to the method of test for adhesion (see Appendix A). A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct appli
10、cation. 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, pages i and ii, pages1 to6, an inside back cover and a back cover. This standard has been updated (see copyright date)
11、and may have had amendments incorporated. This will be indicated in the amendment table on theinside front cover.BS4781:1990 BSI 03-1999 1 1 Scope This British Standard specifies requirements for plastics labels for permanent adhesion under specified conditions. Requirements and methods of test are
12、given for adhesion, dimensional stability, colour fastness and permanence of legend as well as resistance to water, temperature variation, abrasion, detergents and other chemicals. It does not apply to pressure-sensitive adhesive labels for marine use which are the subject ofBS5609. NOTE 1Assumption
13、s should not be made that adhesion performance as determined by the method described in this British Standard can be related to performance on different substrates. NOTE 2The titles of publications referred to in this standard are listed on the inside back cover. 2 Definitions For the purposes of th
14、is British Standard, the following definitions apply. 2.1 pressure-sensitive adhesive plastics label (orlabel) a label, plate, panel or decorative trim with or without a legend or symbol (for any purpose, e.g.identification, instruction, warning, decoration) and made of plastics film or sheet to whi
15、ch a pressure-sensitive adhesive has been applied as an integral part of the construction 2.2 flexible label a label which can be bent through180 without breaking or permanent deformation 2.3 pressure-sensitive adhesive an adhesive which will firmly adhere to a variety of surfaces after the applicat
16、ion of light pressure 2.4 permanent adhesion adhesion of such nature that the label after fixing to the product in accordance with the manufacturers instructions cannot be readily removed or moved after24h 2.5 protective backing a specially treated material affixed to the adhesive surface of the lab
17、el to protect that surface until the time of application 2.6 release the act of separating the protective backing from the adhesive surface of the label 2.7 product the article, appliance, equipment, machine or part to which the label is to be applied 3 Performance 3.1 General 3.1.1 Release. The lab
18、el and the protective backing shall separate without deformation of the label using the method advised by the manufacturer and shall leave neither adhesive attached to the backing nor protective backing attached to the label. 3.1.2 Ease of application. When the protective backing has been removed, t
19、he label shall be capable of application to the test surface followed by all-over pressure without any difficulty when applied according to the test procedure. For example, it shall not curl to an extent which detracts from ease of application. 3.2 General-purpose labels NOTEThe requirements specifi
20、ed in 3.2.1 to 3.3.5 refer to sample sizes as specified in the appropriate appendices and may be carried out on uncut label stock and also finished labels provided the labels are of sufficient size. 3.2.1 Adhesion. When tested in accordance with A.1, initial adhesion values shall be not less than7.3
21、N/25mm width and final adhesion values shall be not less than15.0N/25mm width. 3.2.2 Dimensional stability. When prepared and tested in accordance with A.2 the dimensions of applied labels shall not alter by more than+0%3.0%. 3.2.3 Colour fastness. Colour fastness of the label stock and any applied
22、print shall be determined on a test specimen prepared in accordance with A.2. After accelerated weathering for1 500h in accordance with BS3900-F3, colour fastness of the label stock and any applied print shall be not less than3 using the grey scale of BS1006-A02, when compared with an unweathered te
23、st specimen. 3.2.4 Permanence of legend. The legend shall remain legible after being tested in accordance with the method given in B.3 of BS3955:1986. The legend shall also remain legible after exposure to accelerated weathering as prescribed in 3.2.3. 3.2.5 Water resistance. When tested in accordan
24、ce with A.3, the labels shall meet the requirements for: a) adhesion (see 3.2.1); b) dimensional stability (see 3.2.2); c) colour fastness (see 3.2.3); d) permanence of legend (see 3.2.4).BS4781:1990 2 BSI 03-1999 3.3 Labels for specific applications 3.3.1 General. All labels shall comply with 3.2.
25、In addition, labels for specific applications shall comply with one or more of the appropriate requirements of 3.3.2 to 3.3.5. NOTEIf required, resistance to oils, greases, detergents and other materials should be agreed between manufacturer and user. 3.3.2 Resistance to temperature variation. Label
26、s that comply with 3.3.2 shall be designated type1 or type2 in accordance with Table 1. When tested in accordance with A.4, no lifting, peeling or delamination shall occur and the legend shall still be legible. 3.3.3 Resistance to dry heat. Labels that comply with3.3.3 shall be designated type3, typ
27、e4 or type5 in accordance with Table 1. When tested in accordance with A.5, no lifting, peeling or delamination shall occur and the legend shall still be legible. Table 1Designations for resistance to temperature variation 3.3.4 Resistance to humid heat. Labels that comply with 3.3.4 shall be design
28、ated type6. When tested in accordance with A.6, no lifting, peeling or delamination shall occur and the legend shall still be legible. 3.3.5 Resistance to wear or abrasion. NOTELabels are also required to comply with 3.3.2 to 3.3.4 as appropriate, i.e.for types1 to6. Labels that comply with 3.3.5 sh
29、all be designated type7. When tested in accordance with A.7, all patterns and print on the labels shall remain unbroken and completely discernible when examined visually. 3.3.6 pH of aqueous extract. When tested in accordance with Appendix H of BS3924, the pH of an aqueous extract of the label shall
30、 be between 5.5 and 8.0. 3.3.7 Conductivity of aqueous extract. An aqueous extract should have either a) or b) as follows: a) a maximum conductivity of2.5mS/m, when measured in accordance with Appendix J of BS3924; or b) when conductivity exceeds that given in a): 1) a maximum content of0.05% chlori
31、de, calculated as NaCl, when measured in accordance with the volumetric method of BS3266; and 2) a maximum content of0.25% sulphate, calculated as Na 2SO 4 , when measured in accordance with the gravimetric method of BS3266. NOTEFor Government contract purposes, general purpose labels and labels for
32、 specific applications should comply with3.3.6 and 3.3.7. 4 Storage 4.1 General-purpose labels Labels shall retain in properties specified in this standard for a period of not less than12 months from the date of despatch, when stored in accordance with the manufacturers instructions or, in the absen
33、ce of such instructions, in temperate conditions. 4.2 Labels for specific applications Labels, when stored in their original unopened packages at temperatures between10C and30 C, and relative humidity between45% and75%, shall retain, for a period of not less than12months from the date of despatch by
34、 the manufacturer, the properties specified in this standard. 5 Marking Each package of labels shall be legibly marked with the following information: a) the name, trademark or other means of identifying the manufacturer/supplier; b) the label size and designation; c) the date of despatch from the m
35、anufacturer/supplier; d) the number and date of this British Standard, i.e. BS4871:1990 1) . Designation Temperature variation Type 1 (general purpose) 20C to+50C Type 2 40C to+50C Type 3 up to80C Type 4 up to100C Type 5 up to125C 1) Marking BS4781:1990 on or in relation to a product represents a ma
36、nufacturers declaration of conformity, i.e.a claim by or on behalf of the manufacturer that the product meets the requirements of the standard. The accuracy of the claim is therefore solely the responsibility of the person making the claim. Such a declaration is not to be confused with third party c
37、ertification of conformity, which may also be desirable.BS4781:1990 BSI 03-1999 3 Appendix A Methods of test A.1 Adhesion A.1.1 Apparatus A.1.1.1 Tensile testing machine, of the constant rate of traverse type, equipped with a continuous indicating device so calibrated that the applied force can be d
38、etermined to 2%. The rate of movement of the driven clamp or jaw shall be300 30mm/min. NOTESuitable apparatus is specified in BS5214-1. In case of dispute, a low inertia type of machine shall be used. A.1.1.2 Float process plate glass test plates, of at least6mm thickness. NOTEA convenient size of p
39、late is200mm 50mm. A.1.1.3 Roller 2) , of95 3mm diameter and50mm width, covered with rubber having a hardness of75 to85 shore; made of metal and of mass2 000 50g. A.1.1.4 Aluminium foil, 3) 0.05mm thick and flat and free from creases. A.1.1.5 Cleaning materials, comprising the following: a) lint-fre
40、e cotton wool, BPC quality; b) 4-hydroxy-4-methylpentan-2-one (diacetonealcohol); c) industrial methylated spirits, 4) d) acetone; e) toluene; and f) ethanol or butanone (methyl ethyl ketone). A.1.2 Preconditioning Immediately before test specimens are prepared, precondition the labels for at least2
41、4h in an atmosphere of23 2 C and505% r.h. A.1.3 Test specimens Cut three test specimens (see clause4) measuring200mm 25mm from each label. A.1.4 Procedure A.1.4.1 Flexible plastics labels A.1.4.1.1 Preparation of substrate. Wipe the surface of the glass plates (A.1.1.2) with a fresh piece of lint-fr
42、ee cotton wool saturated with4-hydroxy-4-methylpentan-2-one. Dry the plate with fresh cotton wool, then wipe the surface with fresh cotton wool saturated with one of the cleaning materials listed in items c) to f) ofA.1.1.5 of this appendix. Dry the plates with fresh cotton wool, then repeat for a t
43、otal of three cleaning operations with this solvent. A.1.4.1.2 Preparation of test specimens. Place the prepared glass plate, test surface uppermost, on a flat level surface. Remove the protective backing from a test specimen and place the test specimen adhesive side downwards on the glass plate usi
44、ng light finger pressure only. Ensure that the test specimen is unstretched and is applied central and parallel to the longer sides of the plates, taking care that no air bubbles are trapped between the glass plate and the test specimen. Place the roller centrally across the test specimen on one end
45、 of the plate and, taking care not to apply any additional pressure by hand, roll twice in each direction so that each traverse of200mm occupies about10s, ensuring that the roller travels in the exact line of the test specimen. Prepare three test specimens in this way. A.1.4.1.3 Conditioning of the
46、test specimens A.1.4.1.3.1 For initial adhesion, condition the test specimens for20min in the atmosphere specified inA.1.2. A.1.4.1.3.2 For final adhesion, condition the test specimens for24h in the atmosphere specified inA.1.2. A.1.4.1.4 Stripping. Double back one end of the test specimen and fix t
47、he free end of the plate in one clamp of the testing machine and the free end of the test specimen in the other clamp so that the peel angle is180. Set the driven clamp in motion at a constant rate of300 30mm/min and record the average reading, ignoring the first and last25mm of the test piece lengt
48、h. Repeat for the remaining two test specimens. NOTE 1If the test specimen does not peel cleanly from the plate, a small piece of release paper may be interposed between the label and glass plate for approximately1mm from the labels leading edge. This will ensure a true peel from the glass plate. NO
49、TE 2If the test specimen is too short to allow an end to be doubled back prior to stripping, apply a length of suitable pressure-sensitive adhesive tape, at least twice as long as the glass plate, lengthways along the glass plate so that it covers the entire area of the test specimen. Roll as described in A.1.4.1.2, condition as described in A.1.4.1.3 and double-back one end of the tape to form a “tail” prior to stripping. 2) Information on the source of a suitable roller may be obtained from BSI Enquiry Section, Linford Wood, Milton Keynes MK
