1、BRITISH STANDARD BS ISO 17557:2003 Plastics Film and sheeting Cast polypropylene (PP) films ICS 83.140.10 BS ISO 17557:2003 This British Standard was published under the authority of the Standards Policy and Strategy Committee on 24 September 2003 BSI 24 September 2003 ISBN 0 580 42673 4 National fo
2、reword This British Standard reproduces verbatim ISO 17557:2003 and implements it as the UK national standard. The UK participation in its preparation was entrusted to Technical Committee PRI/75, Plastics and rubber film and sheets, which has the responsibility to: A list of organizations represente
3、d on this committee can be obtained on request to its secretary. Cross-references The British Standards which implement international publications referred to in this document may be found in the BSI Catalogue under the section entitled “International Standards Correspondence Index”, or by using the
4、 “Search” facility of the BSI Electronic Catalogue or of British Standards Online. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard does not of itself confer immunity from le
5、gal obligations. aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK.
6、Summary of pages This document comprises a front cover, an inside front cover, the ISO title page, pages ii to iv, pages 1 to 7 and a back cover. The BSI copyright notice displayed in this document indicates when the document was last issued. Amendments issued since publication Amd. No. Date Comment
7、sNITENRATIONAL TSDNAARD ISO 75571 iFtsr deoitin 23001-90-5 Reference number ISO 17557:2003(E) Plastics Film and sheeting Cast polypropylene (PP) films Plastiques Film et feuille Films de polypropylne (PP) moulsINTERNATIONAL STANDARD ISO 17557 First edition 2003-09-15 Refecnern eumreb OSI 57175002:)E
8、(3 OSI 2003 Plasscit mliF dna gniteehs tsaC lopypropynele f )PP(smli lPsauqitse F iml f teeuille Films ed lopypropylne (PP) uomlsBSISO17557:2003ISO :75571(3002)E ii BSISO17557:2003ISO 55713002:7)E(iii Contents Page 1 Scope 1 2 Normative references 1 3 Classification . 1 4 Requirements . 2 5 Test met
9、hods 4 6 Packaging . 6 7 Marking . 6 BSISO17557:2003ISO :75571(3002)E iv Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO tec
10、hnical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closel
11、y with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2. The main task of technical committees is to prepare International Standards. Draft
12、International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. Attention is drawn to the possibility that some of the elements of this documen
13、t may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. ISO 17557 was prepared by Technical Committee ISO/TC 61, Plastics, Subcommittee SC 11, Products. It is based on Japanese Standard JIS Z 1713:1997. BSISO17557:2003ANRETNIITOTS LANDN
14、ADRA ISO 55713002:7)E(1 Plastics Film and sheeting Cast polypropylene (PP) films 1S c o p e This International Standard specifies the requirements for cast polypropylene (PP) films, which are mainly used for packaging. 2 Normative references The following referenced documents are indispensable for t
15、he application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 291:1997, Plastics Standard atmospheres for conditioning and testing ISO 527-3:1995, Plastics Determina
16、tion of tensile properties Part 3: Test conditions for films and sheets ISO 4593:1993, Plastics Film and sheeting Determination of thickness by mechanical scanning ISO 8295:1995, Plastics Film and sheeting Determination of coefficients of friction ISO 8296:1987, Plastics Film and sheeting Determinat
17、ion of wetting tension ISO 14782:1999, Plastics Determination of haze for transparent materials ISO 15106-1:2003, Plastics Film and sheeting Determination of water vapour transmission rate Part 1: Humidity detection sensor method ISO 15106-2:2003, Plastics Film and sheeting Determination of water va
18、pour transmission rate Part 2: Infrared detection sensor method ISO 15106-3:2003, Plastics Film and sheeting Determination of water vapour transmission rate Part 3: Electrolytic detection sensor method 3 Classification Films are classified into four types as shown in Table 1. Table 1 Classification
19、of films Type 1 Homopolymer afilm subjected to corona discharge or flame treatment Type 2 Homopolymer afilm not subjected to corona discharge or flame treatment Type 3 Copolymer bfilm subjected to corona discharge or flame treatment Type 4 Copolymer bfilm not subjected to corona discharge or flame t
20、reatment a Containing more than by mass of propylene. b Containing to by mass of propylene. 95 % 50 % 95 % BSISO17557:2003ISO :75571(3002)E 2 4 Requirements 4.1 Appearance Films shall be visibly free of flaws, slackness, wrinkles, stains, foreign matter or marks which could impair their serviceabili
21、ty. The splicing of two films in a roll should preferably be prominently marked to provide a visible indication when the roll is viewed from the end. The method of marking the splice should be agreed upon between the interested parties. NOTE One acceptable method of doing this is to use coloured adh
22、esive tape. 4.2 Dimensions 4.2.1 General For any individual film selected at random from any delivery, the following dimensions, including their nominal values, shall be as agreed upon between the interested parties. 4.2.2 Width The film width shall lie between the nominal width and a value wider th
23、an the nominal width. Examples of possible widths are shown in Table 2. 4.2.3 Length of film in roll The length of film in a roll shall lie between the nominal length and a value longer than the nominal length. Examples of possible lengths are shown in Table 3. Table 2 Examples of nominal widths of
24、films and associated tolerances Nominal width Tolerance on width NOTE is an integer, 0, 1, 2, , giving width steps of . Table 3 Examples of nominal lengths of film in a roll and associated tolerances Nominal length Length in roll Tolerance 100 0 1 200 0 2 400 0 4 600 0 6 800 0 8of nominal length 5mm
25、 mm mm 500+ 40n +5 0 n 40 mm 1% mk mm +10 0 +20 0 +40 0 +60 0 +80 0 8 000 8 +1% BSISO17557:2003ISO 55713002:7)E(3 4.2.4 Inside diameter of core of roll The inside diameter of the core of the roll should preferably be or . 4.2.5 Thickness The average film thickness shall be within of the nominal thic
26、kness. Examples of possible thicknesses are shown in Table 4. 4.3 Properties The properties of films shall meet the requirements specified in Table 5. 4.4 Physiological behaviour For applications involving food contact, the film shall conform to all applicable regulatory requirements. Table 4 Exampl
27、es of thicknesses and associated tolerances Nominal thickness Thickness of film Tolerance 20 20 25 25 30 30 40 40 50 50 60 60 Table 5 Properties of film Properties Unit Requirements Testing in accordance with Subclause Type 1 Type 2 Type 3 Type 4 Tensile strength at break Longitudinal a MPa 5.4 Tran
28、sverse b Tensile strain at break Longitudinal a 5.4 Transverse b Coefficient of water vapour transmission c 5.5 Haze d 5.6 Wetting tension 5.7 Coefficient of dynamic friction (between surfaces without corona treatment) 5.8 Threshold heat-sealing temperature (between surfaces without corona treatment
29、) e 5.9 a Longitudinal: direction parallel to extrusion direction. b Transverse: direction perpendicular to extrusion direction. c At , relative humidity. d Only relevant to transparent films. e The threshold heat-sealing temperature is the lowest temperature at which the sealing strength is per of
30、width. 76 +2 0 mm 152 +2 0 mm 10 % m m m 2,0 2,5 3 4 5 6 34 21 % 280 380 g/100 m/(m 2 d) 4,0 5,0 h 30 m % 7,0 30 mh 60 m 12,0 mN/m 34 33 34 33 0,5 C 145 145 40 C9 0% 3 N 15 mm BSISO17557:2003ISO :75571(3002)E 4 5 Test methods 5.1 Conditioning of specimens and test conditions Determine the tensile pr
31、operties, haze, coefficient of dynamic friction, wetting tension and threshold heat- sealing temperature at and R.H. in accordance with ISO 291, after conditioning the specimens for at least under the same conditions. 5.2 Appearance examination Check the appearance of the film with the naked eye. 5.
32、3 Dimensions 5.3.1 Width Measure the width of the film using a graduated metal ruler. 5.3.2 Inside diameter of core of roll Measure the inside diameter of the core of a roll using vernier calipers. 5.3.3 Thickness Measure the thickness of the film in accordance with ISO 4593 at ten equidistant point
33、s across the width of the film, using a dial gauge or equivalent. Report the thickness as the arithmetic mean of the ten measurements, to the nearest . 5.4 Tensile strength and tensile strain at break Determine the tensile strength and tensile strain at break in accordance with ISO 527-3. Test five
34、specimens of dimensions as shown in Figure1. The test speed shall be , or . 5.5 Coefficient of water vapour transmission Determine the water vapour transmission rate in accordance with ISO 15106-1, ISO 15106-2 or ISO 15106-3. From the result, calculate the coefficient of water vapour transmission, e
35、xpressed per of thickness, from the following equation: where is the coefficient of water vapour transmission, in grams per thickness per square metre day ; is the water vapour transmission rate, in grams per square metre day ; is the thickness of the specimen, in micrometres. (23 2) C (50 5) % 4h 1
36、 m (100 10) mm/min (200 20) mm/min (300 30) mm/min 100 m PWV= WVTR h 100 PWV 100 m g/100 m/(m 2 d) WVTR g/(m 2 d) h BSISO17557:2003ISO 55713002:7)E(5 5.6 Haze Determine the haze in accordance with ISO 14782. 5.7 Wetting tension Determine the wetting tension in accordance with ISO 8296. 5.8 Coefficie
37、nt of dynamic friction Determine the coefficient of dynamic friction in accordance with ISO 8295. 5.9 Threshold heat-sealing temperature 5.9.1 Apparatus 5.9.1.1 Heat sealer, equipped with a heater in only one bar, with a heating width of or more. 5.9.1.2 Tensile tester. 5.9.2 Preparation of test spe
38、cimens Lay a piece of film about long and wide on another piece of film of about the same dimensions so that their untreated surfaces are in contact. Cover the pieces of film with a single ply of polyester film with a thickness of . Position the assembly between the bars of the heat sealer, with the
39、 heated bar uppermost, so that the seal will be made perpendicularly across the middle of the assembly. Seal the films together, applying a pressure of at a suitable temperature for . Repeat the sealing operation at the same temperature to produce four more specimens. Increase the sealing temperatur
40、e by about and Key width: to thickness: gauge length: initial distance between grips: overall length: Gauge marks. Figure 1 Specimen for tensile testing b 10 mm 25 mm h 1mm L 0 (50 0,5) mm L (100 5) mm l 3 150 mm a 5mm 100 mm 15 mm (12 1,2) m 0,2 MPa 1 s 5 C BSISO17557:2003ISO :75571(3002)E 6 prepar
41、e another five specimens. Prepare additional sets of five specimens at higher sealing temperatures, as required (see 5.9.3). 5.9.3 Procedure Place the ends of a specimen in the jaws of the tensile tester with the distance between the jaws more than . Measure the sealing strength, using a crosshead s
42、peed of per minute. Test five specimens at each sealing temperature. Calculate the average sealing strength per of width at each temperature. Determine, by plotting a graph (see Figure 2), the temperature corresponding to a sealing strength of per . 6 Packaging The packaging and the size of the unit
43、 package shall be as agreed between the interested parties, taking into account the conditions of transportation and storage. 7 Marking 7.1 Marking on products If applicable, the fact that the surface of the film has been subjected to corona discharge or flame treatment shall be clearly indicated. K
44、ey 1 threshold heat-sealing temperature Figure 2 Determination of threshold heat-sealing temperature 50 mm (300 30) mm 15 mm 3 N 15 mm BSISO17557:2003ISO 55713002:7)E(7 7.2 Marking on packaging The following shall be marked on the package: a) the name of the product; b) the classification, i.e. whet
45、her the film is made from a homopolymer or copolymer and whether it has been treated or not (see Table 1); c) the nominal thickness, width and length of the film in the roll; d) the year and month of manufacture; e) the manufacturers name or trademark. BSISO17557:2003BS ISO 17557:2003 BSI 389 Chiswi
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