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1、BRITISH STANDARD BS EN 13206:2001 Covering thermoplastic films for use in agriculture and horticulture The European Standard EN 13206:2001 has the status of a British Standard ICS 65.040.30; 83.140.10 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW Licensed Copy: sheffieldun s
2、heffieldun, na, Mon Oct 30 01:39:30 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN 13206:2001 This British Standard, having been prepared under the direction of the Sector Committee for Materials and Chemicals, was published under the authority of the Standards Committee and comes into effect on 1
3、5 May 2001 BSI 05-2001 ISBN 0 580 37427 0 National foreword This British Standard is the official English language version of EN 13206:2001. The UK participation in its preparation was entrusted to Technical Committee PRI/75, Plastic and rubber films and sheets, which has the responsibility to: A li
4、st 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 the section entitled “Internatio
5、nal Standards Correspondence Index”, or by using the “Find” facility of the BSI Standards Electronic Catalogue. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a Briti
6、sh Standard does not of itself confer immunity from legal obligations. aid enquirers to understand the text; present to the responsible European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European deve
7、lopments and promulgate them in the UK. Summary of pages This document comprises a front cover, an inside front cover, the EN title page, pages 2 to 16, an inside back cover and a back cover. The BSI copyright date displayed in this document indicates when the document was last issued. Amendments is
8、sued since publication Amd. No. DateComments Licensed Copy: sheffieldun sheffieldun, na, Mon Oct 30 01:39:30 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 13206 March 2001 ICS 65.040.30; 83.140.10 English version Covering thermoplastic films for use
9、in agriculture and horticulture Films thermoplastiques de couverture pour utilisation en agriculture et horticulture Thermoplastische Abdeckfolien fr den Einsatz in der Landwirtschaft und im Gartenbau This European Standard was approved by CEN on 4 February 2001. CEN members are bound to comply with
10、 the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the Management Centre
11、or to any CEN member. This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the Management Centre has the same status as the official versi
12、ons. CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN D
13、E NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: rue de Stassart, 36 B-1050 Brussels 2001 CENAll rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 13206:2001 E Licensed Copy: sheffieldun sheffieldun, na, Mon Oct 30 01:39:30
14、GMT+00:00 2006, Uncontrolled Copy, (c) BSI Page 2 EN 13206:2001 BSI 05-2001 Foreword This European Standard has been prepared by Technical Committee CEN/TC 249, Plastics, the Secretariat of which is held by IBN. This European Standard shall be given the status of a national standard, either by publi
15、cation of an identical text or by endorsement, at the latest by September 2001, and conflicting national standards shall be withdrawn at the latest by September 2001. Annex A is informative. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following coun
16、tries are bound to implement this European Standard: Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom. Licensed Copy: sheffieldun sheffieldun, na, Mon Oct
17、 30 01:39:30 GMT+00:00 2006, Uncontrolled Copy, (c) BSI Page 3 EN 13206:2001 BSI 05-2001 1Scope This standard concerns transparent and diffusing plastic films based on polyethylene and/or ethylene copolymers which are designed to be used as covers for permanent and temporary greenhouses for forcing
18、and semi-forcing vegetable, fruit and flower crops. This standard is intended to establish the basic requirements for the physical and mechanical characteristics of various types of film. From a detailed consideration of the different covering plastics films used in agriculture and horticulture in t
19、he European market, different types of film are considered, according to the application, independently of the colour: normal film thermic clear film thermic diffusing film The range of thicknesses considered is from 50 ?m up to more than 200 ?m. 2Normative references This European Standard incorpor
20、ates by dated or undated references, provisions from other publications. These normative references are cited at the appropriated places in the text and the publications are listed hereafter. For dated references subsequent amendments to or revisions of any of these pubblications apply to this Europ
21、ean Standard only when incorporated in it by amendment or revision. For undated references the latest edition of the pubblication referred to applies (including amendments). EN 2155-5, Aerospace series Test methods for transparent materials for aircraft glazing Determination of visible light transmi
22、ssion EN 2155-9, Aerospace series Test methods for transparent materials for aircraft glazing Determination of haze EN ISO 527-1, Plastics Determination of tensile properties Part 1: General principles (ISO 527-1:1993 including Corr 1:1994) EN ISO 527-3, Plastics Determination of tensile properties
23、Part 3: Test conditions for films and sheets (ISO 527-3:1995) EN ISO 4892-2, Plastics Methods of exposure to laboratory light sources Part 2: Xenon arc sources (ISO 4892-2:1994) ISO 4591, Plastics Film and sheeting Determination of average thickness of a sample and average thickness and yield of a r
24、oll by gravimetric techniques (gravimetric thickness) ISO 4592, Plastics Film and sheeting Determination of length and width ISO 4593, Plastics Film and sheeting Determination of thickness by mechanical scanning ISO 7765-1:1988, Plastics film and sheeting Determination of impact resistance by the fr
25、ee falling dart method Part 1: Staircase methods Licensed Copy: sheffieldun sheffieldun, na, Mon Oct 30 01:39:30 GMT+00:00 2006, Uncontrolled Copy, (c) BSI Page 4 EN 13206:2001 BSI 05-2001 3Terms and definitions For the purposes of this standard, the following terms and definitions apply. 3.1 width
26、total width of the film when laid flat, given in millimetres NOTEFilms which are wider than 2 000 mm are usually folded lenghtwise at least once before of the winding on a reel. These folds are retained even when the film is laid out flat, and this may affect test results. Therefore, a distinction s
27、hall be made between the sample sheets taken from the folds (“fold” area) and sample sheets taken from areas which have not been folded (“flat” area). 3.2 nominal width width declared by the manufacturer in millimeters 3.3 thickness given in micrometers 3.4 nominal thickness thickness declared by th
28、e manufacturer in micrometers 3.5 length of the roll largest dimension of the roll in mm 3.6 longitudinal direction of the roll (MD) direction parallel to the length of the roll corresponding to the extrusion direction 3.7 transverse direction of the roll (TD) direction parallel to the width (at rig
29、ht angles to the length) 4Plastics materials Agricultural covering film in accordance with the EN Standard is usually manufactured from: low density polyethylene (PE-LD), linear low density polyethylene (PE-LLD) and their blends; ethylene vinyl acetate copolymers (E/VAC) and their blends with PE-LD
30、or PE-LLD; ethylene butyl-acrylate copolymers (E/BA) and their blends with PE-LD or PE-LLD. Licensed Copy: sheffieldun sheffieldun, na, Mon Oct 30 01:39:30 GMT+00:00 2006, Uncontrolled Copy, (c) BSI Page 5 EN 13206:2001 BSI 05-2001 5Types and ranges of use The different types of film covered by this
31、 standard and their respective ranges of use are shown in Table 1. Table 1 Characteristics and use of covering films TypeCharacteristicsUse Normal film- good transparency - low greenhouse effect Forcing and semiforcing crops Thermic clear film- good transparency - high IR effectiveness As normal fil
32、m, when greater IR effectiveness is desired Thermic diffusing film- diffusing light - high IR effectiveness As normal film, when greater IR barrier and diffusing light is desired 6Duration The duration of a covering film is declared by the manufacturers and is determined testing the variation of its
33、 elongation at break after accelerated weathering (see 8.10). The film is classified as class N, A, B, C, D and E (see Table 2), depending on the time required to decrease the value of its tensile strain at break to the 50% of the initial value. Table 2 Covering films Classification on the basis of
34、the artificial weathering duration Class of filmDuration (hours) N? 400 A? 1 700 B? 3 200 C? 4 600 D? 6 000 E? 7 300 7Properties of the covering films Table 3, 4 and 5 indicate the properties of normal, thermic clear and thermic diffusing films, respectively. 8Test methods 8.1Appearance The free edg
35、es of the roll shall be sealed with adhesive tape or by some other similar means, in order to prevent its unwinding. The edges shall be properly in line and there shall be sufficient tension to prevent the layer of the roll from transverse slipping when it is handled (this shall be done horizontally
36、). Licensed Copy: sheffieldun sheffieldun, na, Mon Oct 30 01:39:30 GMT+00:00 2006, Uncontrolled Copy, (c) BSI Page 6 EN 13206:2001 BSI 05-2001 The film shall be homogeneous and free from visible defects which may affect the functionality of the film (check by unrolling at least 2 m of the film and e
37、xamining it against the light at arms length). 8.2Thickness The thickness of the single points of the film and average thickness of the film shall be determined in accordance with ISO 4591 and ISO 4593 respectively. 8.3Width The width of the film shall be determined in accordance with ISO 4592. 8.4D
38、etermination of tensile properties The tensile properties shall be determined according to EN ISO 527-3 using a test specimen type 2, 10 mm wide with a test speed of 500 mm/min. Test procedure shall refer to EN ISO 527-1. 8.5Determination of impact resistance The determination of impact resistance (
39、Dart drop test) shall be determined in accordance with ISO 7765-1:1998 method A. 8.6Elongation under a steady load (creep test) 8.6.1Principle To measure the elongation of a film under a stated load after a fixed time in a vertical static position. 8.6.2Apparatus Two grips hold the test specimen. A
40、weight is hung to the lower (free) grip to provide a steady stress in the specimen. The upper grip is clamped to a fixed support as in Figure 1. Licensed Copy: sheffieldun sheffieldun, na, Mon Oct 30 01:39:30 GMT+00:00 2006, Uncontrolled Copy, (c) BSI Page 7 EN 13206:2001 BSI 05-2001 Key 1 Fixed sup
41、port 2 Grips 3 Test specimen 4 Weight Figure 1 Typical arrangement Licensed Copy: sheffieldun sheffieldun, na, Mon Oct 30 01:39:30 GMT+00:00 2006, Uncontrolled Copy, (c) BSI Page 8 EN 13206:2001 BSI 05-2001 8.6.3Operative conditions The test is done on 3 specimens cut from the film in the machine di
42、rection (MD). Dimension of the specimen: width: 10 mm; total length: 140 mm; gauge length defined between two marks: 100 mm. Test conditions: test temperature: 23 C ? 2 C; load to be applied: 4 Mpa; duration of the test: 100 h. 8.6.4Procedure Place the test specimen on which the gauge length of 100
43、mm has been marked, in the grips. Calculate the weight which is needed for the test with reference to the minimum cross section of the specimen, and adjust the test weight to this value (e.g. by adding or removing lead shot to the weight). Carefully hang the system, grips specimen weight, to the fix
44、ed support, avoiding jerks and shocks. NoteDuring the test the apparatus shall not be subjected to vibration or shocks which may influence the final measurement. 8.6.5Results The results are expressed as the strain of the sample as a percentage of the original length. 100 o o = L L - L A where: Ais
45、the value of the creep Lois the initial gauge length in mm Lis the arithmetic mean of the distance between the two marks that define the gauge length of each specimen at the end of the test. 8.7Total visible light transmission The total visible light transmission is determined in accordance with EN
46、2155-5 applied to 5 specimens cut from the covering films. 8.8Determination of the Haze The Haze shall be determined in accordance with EN 2155-9 on 5 specimens taken from the covering films. Licensed Copy: sheffieldun sheffieldun, na, Mon Oct 30 01:39:30 GMT+00:00 2006, Uncontrolled Copy, (c) BSI P
47、age 9 EN 13206:2001 BSI 05-2001 8.9IR effectiveness barrier against thermic radiation 8.9.1Principle The method consists of measuring the IR transmission spectrum of thermic film within wave numbers ranging from 1 430 cm-1 to 770 cm-1 (between 7 m and 13 ?m wavelengths). This range of wavelengths co
48、rresponds to the field of maximum emission of the energy radiated by the earths surface. 8.9.2Apparatus Infrared spectrophotometer attached to a recorder. Analytical balance with a 0,1 mg margin of error or planimeter. 8.9.3Procedure The measurement is done on 5 specimens taken from the film under t
49、est. Put each specimen to be checked on the specimen holder of the spectrophotometer and record the spectrum of transmission from 1 500 cm-1 to 700 cm-1. Measure the area between 100% transmittance and the curve of the spectrum with the help of a planimeter or by using the following weighing method. Cut a sheet bearing the trace of the spectrum (or a copy of it) at 1 430 cm-1 and 770 cm-1 and along the lines of 0 % and 100 % transmittance. Weigh this rectangle to an accuracy of 0,1 mg.
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