1、STD-BSI BS EN 12575-ENGL 1778 W lib24bb7 0732b85 173 W BRITISH STANDARD Plastics - Thermoset moulding compounds - Determination of the degree of fibre wet out in SMC The European Standard EN 125751998 has the status of a British Standard Ics83.080.10; 83.120 BS EN 12575:1998 NO COPYING WITHOUT BSI P
2、ERMISSION EXCEPT AS PERMITTED BY COPYRIGH LAW BS EN 12575:1998 Amd.No. National foreword Date Text affected This British Standasd is the English language version of EN 12575: 1998. The UK participation in its preparation was entrusted to Technical Committee PRV42, Fibre reinforced thermosetting plas
3、tics and prepregs, which has the responsibility to: - aid enquirers to understand the text; - present to the responsible European committee any enquiries on the - monitor related international and European developments and promulgate interpretation, or proposals for change, and keep the UK int.erest
4、s informed; them in the UK A list of organizations represented on this committee can be obtained on request to its secretary. Cross-references The British Standards which implement international or European publications referred to in this document may be found in the BSI Standards Catalogue under t
5、he section entitled “International Standards Correspondence Index”, or by using the “Find facility of the BSI Standards Electxonic Catalogue. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standars are responsible for their correct applica
6、tion. 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, the EN title page, pages 2 to 5, and a back cover. This Bntish Standard, having been prepared under the direction of the
7、Sector Board for Matends and Chemicals. was published under the authonty of the Standards Board and comes intn effect on 15 November i998 O BSI 1998 ISBN O 580 30020 X STD-BSI BS EN L2575-ENGL 1978 Lb24bL7 0732bA7 Tbb EUROPEAN SrmDm NORME EUROPENNE e EUROPmNOFM EN 12575 May 1998 4 m 4 ICs 83.120 83.
8、140.10 Descriptors: Plastics, reinforced plastics, plastic moulding, reinforcing materials, thermosetting resins, composition: property, tests, determination, rates: per unit time, wetting English version Plastics - Thermoset mouldmg compounds - Detemon of the degree of fibm wet out in SMC Plastique
9、s - Compositions de moulage base de thermodurcissables - Dtermination du taux de mouillage des fibres dans les SMC Kunststoffe - Hartbare Formmassen - Eksthnung des Faserbenetzungses in SMC This European Standard was approved by CEN on 1 May 1998. CEN members are bound to comply with the CENKENELEC
10、Inkd Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliogmphical references concerning such national standards may be obtained on application to the Central Secretariat or to any CEN member
11、. This European Standard exists in three officiai versions (English, French, German). A version in any other ianguage made by translation under the responsibility of a CEN member into its own language and notifed to the Centrai Secretariat has the same status as the official versions. CEN members ar
12、e the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, Fiance, Germany, Greece, Iceland, ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. European Committee for Standardization Comit Europen de Normalisation Eur
13、opisches Komitee fr Normung Central Secretariat: rue de Stassart 36, B-1060 Brussels O 1998 CEN Al rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 125751998 E STD-BSI BS EN L2575-ENGL 1998 = Lb2Ybb7 0732b88 9T2 Page 2 EN 12575:1998 Forewor
14、d This European Standard has been prepared by Technical Committee CEN/rC 249, Plastics, the secretariat of which is held by IBN. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by November 1998, and
15、conflicting national standards shall be withrawn at the latest by November 1998. According to the CENKENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard Austria, Belgium, Czech Republic, Denmark, Finland, France,
16、 Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom. Contents Foreword Introduction 1 Scope 2 Normative references 3 Defnitions 4 sampling 5 Apparatus 6 Procedure 7 Expression of results 8 Test report 9 Precision Pag
17、e 2 3 3 3 3 3 3 3 4 4 4 STDSBSI BS EN L2575-ENGL 1998 m Lb24bb7 0732b89 837 m Page 3 EN 12575:1998 Introduction This test method provides a common basis for reinforcement manufacturers, compounders and moulders to compare data and follow the consistency of wet out. As wet out often improves during t
18、he first 24 h, samples of the same age are used for comparison purposes. In a production situation the process and formulation are assumed to be constant and are sufficient to produce a visual standard level of wet out. Any drifts in paste viscosity, reinforcement fibre content, mass per unit area,
19、compaction structure etc. which adversely affect wet out can be identified. In a development situation the compounduig process conditions need to define an acceptable wet out of the control. Formulation or reinforcement specimens can be screened along with the control under identical process conditi
20、ons. The test is carried out after compounding allowing the products under test to be judged superior or mferior to the control. 1 scope This European Standard specifies a test method to determine the degree of wet out of the reinforcement in a sheet moulding compound (SMC). It is applicable for qua
21、lity control by the user of the SMC as well as for the process Control during the SMC production. 2 Normative references This European Standard incorporates by dated or undated reference, provisions from other publications. These normative references are cited at the appropriate places in the text a
22、nd the publications are listed hereafter. For dated references, subsequent amendments to or revisions of any of these publications apply to this European Standard only when incorporated in it by amendment or revision. For undated references the latest edition of the publication referred to applies.
23、IS0 8604, Plastixs - Prepregs - Definitions of terms and symbols for designations. IS0 472, -tics - Voablaq 3 Definitions For the purposes of this standard, the terms and definitions of IS0 472 and 8604 and the following definitions apply: 3.1 fibre bundle discrete collection of many parallel fibre
24、filaments, chopped or unchopped 3.2 wet out state in which ali the reinforcing bundles in the SMC sheet, not necessarily each individual Nament, are wet by the paste 4 sampling From each item to be controlled (one roll or a sheet of SMC), obtain a laboratory sample consisting of a strip of 40 cm min
25、imum accross the entire width of the SMC sheet. 5 Apparatus - Ruler (solvent resistant); - Sampling table (approximately 100 cm X 180 cm). - Solvent resistant opaque plate, with a 10 cm X 10 cm inspection window (reading field) in its centre. - Solvent resistant gwes. - Mwq/2ng glass (magnification
26、10 X). - Disposable spatula (such as tongue depressors). 6 Procedure 6.1 Cany out the test immediately after compounding. This procedure can be used as a quality control test at any specified time after manufacture. 6.2 Remove the top carrier film from the sample. Use the spatula to split the SMC at
27、 different levels of the sheet. This results in a cross section of the SMC sheet in which one can observe the fibres on the top, middle and bottom of the SMC at the same time (see Figure 1). If the degree of wet out is 100 %, the use of the inspection window is unnecessary 6.3 if there are dry spots
28、, take a new sample and split it across the entire width along the level containing the most dry areas as previously observed (6.2). Divide the sample into four identical Stsips of 10 cm length perpendicular to the machine direction and choose the strip which contains the largest dry spots (see Figu
29、re 2). 6.4 inspect the wet out conditions by moving the inspection window in 10 cm steps from left to right In each 10 cm square (reading field), use the ruler to measure the dimensions of the dry spots to determine the surface area in square centimetres and record the readings. Summarize these read
30、ings to achieve the dry spot area of each reading field (Zi). NOTE 1 The use of a magnifyhg glass when necessary, especially in the case of light colours, high filler content and low solubility sizing of the reinforcing fibres is recommended. NOTE 2 Pushing down on the SMC with any object (hands, sp
31、atula, knife, elbow etc.) will generally move the paste off the fibres and cause a defect. NOTE 3 direction repeatedly exhibit a defect, the determination of the special cause of this defect allows its correction (i.e. wrinkles in film or partial blockage of the doctor blade). Should any particular
32、area parallel to the machine O BSl 1998 STD-BSI BS EN L2575-ENGL 1798 W Lb24bb9 0732b90 550 M Page 4 EN 12575:1998 1 2 1) Width 2) Machine direction 4) Middle 5) Bottom 6) kvel of split 3) TOP Figure 1 L 3 2 1 I 1) Chosen strip Figure 2 7 Expression of results Degree of fibre wet out is obtairied by
33、 the equation: zi I)w = 100 - i=l x 100 nXA where: qY n Zi A is the degree of fibre wet out in per cent; is the number of reading fields, is the total dry spot area of an individual readmg field in square centimetres; is the surface of the reading field (inspection window) in square centimetres 8 “e
34、st report The test report shall include the following details. 8.1 Reference to this European Standard. 8.2 Formulatioddesignation of the SMC. 8.3 Date of production, batch number. 8.4 Number of reading fields of the inspected line (specimen). 8.5 Degree of fibre wet out (qY). 8.6 Special defect, it
35、s exact description and location, i.e. largest single dry spot of the inspected stsip with the number of the respective reading field (see Figure 3). For production control purposes the following information shall be added 8.7 Time between production, sampling and testing 8.8 Temperature of the prod
36、uction room 8.9 Relative humidity of the production room 9 Precision The precision of this method is not known because interlaboratory data are not available. When interlaboratory data are obtained, a precisioii statcinent wili be added with the next revision. STD-BSI BS EN L2575-ENGL 1978 = 1b21ibb
37、7 0732b71 Li77 Page 5 EN 12575:1998 I 2 -.chine direction argest single spot strip 2 field 4 L 2/4 Figure 3 O BSI 1998 BS EN 12575:1998 BSI 389 Chiswick High Road London w4 4AL BSI - British Standards Institution BSI is the independent national body responsible for preparing British Standards. It pr
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