Tiêu chuẩn iso 06383 1 2015

© ISO 2015 Plastics — Film and sheeting — Determination of tear resistance — Part 1 Trouser tear method Plastiques — Film et feuille — Détermination de la résistance au déchirement — Partie 1 Méthode[.]

Plastics — Film and sheeting —

Part 1:

Plastiques — Filmet feuille — Déte mination de la résista c a

déchirement —

Partie 1: Méth de de déchirement p ntalo

S con edition

2 1 -1 -1

Refer ence n mb r

ISO 63 3-1:2 1 (E)

COPYRIGHT PROTECTED DOCUMENT

© ISO 201 , P blshed in Sw itz rlan

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the r eq eser

ISO c pyrig ht ofic

C de Blan on et 8 • C 4 1

CH-1 14 Vernier, Geneva, Sw itzerlan

Tel + 12 7 9 011

F reword i v

1 Sc ope 1

2 Nor mati ve r eferenc es 1

3 Terms and definitio s 1

4 Sig nificanc e 1

5 Principle 2

6 A pparatus 2

7 Test specimens 2

8 Number of test specimens 3

9 Spe d of testing 3

10 Co ditioning 3

11 Proc ed re .3

12 Ex pres io of r esults 3

13 Test rep rt 4

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ele trot ech ical s an ardization

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dife ent ty es of ISO document should be not ed This document was draft ed in ac ordanc with the

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F or an ex lanation on the meaning of ISO spe ific t erms an ex r s ions r lat ed t o conformity

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Bar ie s t o Trade (TBT) se the fol owing URL: F or word - Sup lementary information

The committ ee r sp nsible for thisdocument is ISO/TC61, Plas tic s ,Subcommitt ee SC 1 , Produc ts

This se on edition canc ls an r plac s the f irs edition (ISO 6 8 -1:1 8 ), of w hich it cons itut es a

minor r vision

ISO 6 83 consis s of the folowing p rt , u de the g ene al title Plas tic s — Fim a d she tin —

Dete min tio o tear r s i s ta c e:

— Part 1: Tro s er tear meth d

— Part 2 : Elmendorfmeth d

Plastics — Film and sheeting — Determination oftear

Part 1:

This part of ISO 63 3 spe ifies a method of det ermining the t ear r sis anc of plas ic film or she t

les than 1 mm thick, in the form of s an ard trouser-sha ed t es spe imens, t est ed un e def ined

con itions of pr -tr atment, t empe atur , h midity, an spe d of t es ing

The method is a pl ca le t o film an she ting of both flexible an rigid mat erials, pro ided that the

mat erial is not so rigid that brit le fractur oc urs d ring the t es , or so deforma le, in an ir eve sible

wa , that the ene g used in the deformation of the spe imen legs is signif icant ( i.e is not negl gible)

with r spe t t o the ene g used in t earing

The method ma not be suita le for det ermining the t ear pro e ties of c lular she t an f ilm

2 Normati ve r eferences

The folowing document , in w hole or in p rt, ar normatively r fe enc d in this document an ar

in ispensa le for it a pl cation F or dat ed r fe enc s, only the edition cit ed a pl es F or u dat ed

r fe enc s, the lat es edition of the r fe enc d document ( inclu ing any amen ment )a pl es

ISO 2 1, Plas tic s — Sta dard atmos phe es fr c onditionin a d tes tin

ISO 5 7 –3, Plas tic s — Dete min tio  o tens ile pro erties — Part 3: Tes t c onditions fr fims a d she ts

ISO 45 1, Plas tic s — Fim a d she tin — Determin tio o a e a e thicknes s o a s ample, a d a e a e

thicknes s a d y ield o a rol, b gravimetric techniq es (grav imetric thicknes s)

ISO 45 3, Plas tic s — Fim a d she tin — Dete min tio o thicknes s b mecha ic al sc an in

3 Terms and definitions

F or the purpose of this document, the folowing t erms an def initions a ply

3.1

tearing for e

avera e for e r q ir d t o pro a at e a t ear at a cons ant tearing spe d ac os a t es spe imen

conforming t o Figur 1

3.2

tea resistance

t earing for e divided b the spe imen thicknes

4 Sig nificanc e

4.1 This method ma y pr ovide data for q alty contr ol, ac eptanc , or r eje tion in ac ordanc with the

te ms of spe ifications and for r esear ch an develo ment

4.2 Tear pr ope tiesma y v ry with spe imen pr ep ration, spe d of testing , an environment of tes ing

C nseq ently, when pr ecise comp rative r esult ar e r eq ir ed, these factors shal be car efuly controled

It is p s ible, in principle, t o comp r the t ear r sis anc (3.2) of spe imens of dife ent mat erials,

pro ided that their thick es es do not dife b mor than ± 0 % Howeve , caution is ne es ary in

int erpr ting such r sult , sinc the t earing ene g can v ry conside a ly with spe d of t es ing for

dife ent mat erials

A r ctangular t es spe imen ha ing a longitu inal slt exten ing o e half it length is subje ted to

a tensie tes on the “ trouse legs” formed b the slt The a e age for e r q ir d to tear the spe imen

completely along it length is used to calculat e the tear esis anc of the mat erial u de tes ( e Figur 1)

6 A pparatus

6.1 Tensie testing machine (not pen ulum type), simiar to that spe ified in ISO 5 7-3, ha ving the

folow ing char acte is ics

6.1.1 It shal be p we dr i ven an ca a le of maintaining the a propr iate rate of gr ipsep ration spe ified

in Clause 9 It is es ential that the lo d measur ing devic is eq ip ed with an autographic recording devic

to record the lo d a pled to the spe imen as a fu ction of ela sed time from the s ar t of the test

6.1.2 T e g rips shal be eq ipped with ch cks desig ned to se ur ely hold the leg s of the tes spe imen

without slp The chucksshal be wide than the width of the tes spe imen an , in or de that they r emain

p r alel to each othe d ring a test , they shal not be mou ted on swivel joint

6.2 Suitable equipment for me suring the thicknes of spe imens b the method desc ibed in

ISO 45 3 F r emb s ed fim or she ting , the a p ratus spe ified in ISO 45 1shal be used

7 Test specimens

7.1 Tes spe imens shal ha ve the sha e and dimensionsshown in Fig ure 1 The leng th of the sl t in the

c ntr e of the spe imen shal be 7 mm ± 1mm

7.2 The tes spe imens shal be cut so that the edg es ar e smo th and fr ee fr om notches Examination

with a low-p we micr osco e is r ecommen ed to che k fr eedom fr om nicks It is imp rtant to pa y

p rticular atention to thetip of the slt in the c ntr e of thespe imen

7.3 The pr ope ties of c rtain types of fim an she ting mate ials ma y v ry with direction in the plane

of the fim (anisotr opy) In such cases, it is es ential to pr ep re two g r oups of tes spe imens with their

major a es respe tively p r alel an pe pen icular to the dir ection of some featur e of the fim or she ting

which is eithe visible or infe r ed fr om knowledg e of the method of it man factur e

The dir ction of t es ing is defined asthe dir ction of the long a is of the t es spe imen

W ith some ty es of f ilm, dife ent t ear r sis anc r sult ma be o tained for any dir ction of t es ing

(for ex mple, machine dir ction or transve se dir ction)depen ing, for ex mple, in the case of machine

dir ction t es spe imens, on w hethe the t ear pro a ation is in the dir ction of proc s ing or a ains

the proc s dir ction ( e Figur 2) When this is k own t o oc ur, two groups oft es spe imensshal be

cut in the dir ction of t es ing an slt so that r sult can be o tained for the two p s ible dir ctions of

t ear pro a ation

8 Number oftest specimens

8.1 A minimum of five tes spe imens shal be tes ed in each of the r eq ir ed directions of testing

8.2 Spe imens which show a tear out of lne to the ex tent that the tear r eaches one of the edg es of the

tes spe imen shal be discar ded an furthe spe imenstes ed ( e 1 3)

9 Speed of testing

The spe d of t es ing shal be one of the folowing:

— 2 0 mm/min ± 1 %;

— 2 0 mm/min ± 1 %

NOTE A t present time, b th spe ds of testing are common throughout the world F or the time b ing, b th

are b ing alowed for the p rpose of this part of ISO 63 3 Subseq ent revisions of this part of ISO 63 3 might

only incorporate the testing spe d of 2 0 mm/min

10 Conditioning

Unles othe wise spe if ied, t es spe imens shal becon itioned an t est ed in ac ordanc with ISO 2 1,

using atmosphe e 2 °C 5 %, ex cept that w hen a mat erial is known not t o be sensitive t o h midity,

atmosphe e 2 °C ma be used

11 Procedure

11.1 Measur e the thick es of the mate ial u de tes using measuring devic s complying with the

r eq ir ement of ISO 45 3 If, howeve , the fim is ve y thin or if it is emb s ed, dete mine the thick es

b the method of ISO 45 1

11.1.1 When using measuring devic s complying with ISO 45 3, measure the thick es of the tes

spe imen at hr ee eq idis ant p int betwe n the tip of the slt an the o p site en of the tes spe imens

Calculate the mean v lue

11.1.2 When using the method of ISO 45 1, the a verag e thick es of the fim sample shal be taken as

the thicknes of the tes spe imen

11.2 S t the initial sep ration of the g r ips to 7 mm C refull y clamp an algn the tes spe imen legs in the

gr ips so that it major axis coincides with an imag inar y lne joining the c ntre of the gr ips ( se Figure 3)

11.3 S t to the r eq ired spe d of tes ing ( e Clause 9), start hemachine, an r ecord the lo d ne es ary

to pr op gate the tear thr oug h the entir e u -slt leng th of the spe imen If the tear deviates fr om the

c ntr e lne to such an ex tent as to reach one of the edg es of the spe imen, discar d the r esult an tes

anothe spe imen

12 Ex pres ion of r esults

12.1 The lo d-time g raph fr om the autog raphic r ecor de of the tensie tes ing machine wil show v rying

tr ac forms depen ent on the natur e of the mate ials tes ed an their thick es

Disr g rding the lo ds r corded in t earing the firs 2 mm an the las 5 mm of the u -slt length,

det ermine the a pro imat e mean v lue of the t earing lo d over the r maining 5 mm of the u -slt

length When this p rt of the trac is a wa elke plat eau, draw a median l ne, p ralel t o the a scis a,

through the wavelke curve ( e Figur 4) R ead the lo d cor espon ing t o this l ne an r cord it as the

t earing for e of the spe imen

12.2 C lculate the tear resis anc of the spe imen fr om Formula (1):

F

d

t

(1)

w he e

F

t

is the t earing for e, in newt ons, of the spe imen;

d is the thicknes , in mi lmetr s, of the spe imen

The t earing for e ma it elf be r p rt ed, w hen r sult ar not r q ir d t o be ex r s ed as the t ear

r sis anc

12.3 C lculate the arithmetic mean for each set of tes spe imens

12.4 If r q ired, calculate the s an ard deviation an coeficient of v r iation for ach set of tes spe imens

13 Test repor t

The t es r p rt shal inclu e the fol owing information:

a) r fe enc t o this p rt of ISO 63 3, i.e ISO 6 8 – ;

b) complet e identification of the mat erial t est ed, inclu ing ty e, sour e, man factur r’ s code, form,

an pr vious hist ory;

c) thick es of the mat erial t est ed;

d) n mbe of spe imens t est ed;

e) spe d of t es ing;

f) mean t ear r sis anc an / r t earing for e for each dir ction of t es ing an t ear pro a ation;

g) in ivid al t es r sult ;

h) s an ard atmosphe e of ISO 2 1 used for on itioning an tes ing an any pr con itioning tr atmen

i) s an ard deviation an coefficient of v riation of the t es r sult , if r q ir d;

j) any o e ational detai s not spe if ied in this p rt of ISO 6 8 that might have had an influenc

upon the r sult

Dimensions in milimetr es

1

2

75

1 0

Key

1 slit

2 test dir ection

Figure 1 — Test specimen

1

2

3

Key

1 pr oces dir ection

2 te r pr opagation in pr oces dir ection

3 te r pr opagation against pr oces dir ection

Figure 2— Directio of tear pro a atio

Figure 3 Meth d of fixing test specimens in grips

X

Y 1

20 mm

4

5

Key

1 lo d

2 fir t 2 mm disregar ded

3 further 5 mm te r

4 slit

5 marks

X te ring force

Y time

Figure 4 — Load-time grap with plateau re io