Tiêu chuẩn iso 03377 2 2016

© ISO 2016 Leather — Physical and mechanical tests — Determination of tear load — Part 2 Double edge tear Cuir — Essais physiques et mécaniques — Détermination de la force de déchirement — Partie 2 Dé[.]

Leather — Physical and mechanical

Part 2:

Cuir — Essais p ysiques et méca iques — Déte mination de la fr e

de déchirement —

Partie 2: Déchirement de s deu b rds

S con edition

2 16-0 -1

Reference n mb r

ISO 3 7 -2:2 16(E)

IUL CS IUP 8:2 16(E)

IULT CS IUP 8:2016(E)

© ISO 2016, P blshed in Sw itz rlan

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the r eq eser

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F reword i v

1 Sc ope 1

2 Nor mati ve r eferenc es 1

3 Principle 1

4 A pparatus 1

5 S mpl n an sample pr eparation 2

6 Proc ed re .2

7 Test rep rt 3

ISO (he Int ernational Org nization for Stan ardization) is a worldwidefede ation of national s an ards

b dies (ISO membe b dies) The work of pr p ring Int ernational Stan ards is normaly car ied out

through ISO t ech ical committ ees Each membe b dy int er st ed in a subje t for w hich a t ech ical

committ ee has be n es a lshed has the right t o be r pr sent ed on that committ ee Int ernational

org nizations, g ove nmental an non-g ove nmental, in laison with ISO, also take part in the work

ISO cola orat es closely with the Int ernational Ele trot ech ical C mmis ion (IEC) on al matt ers of

ele trot ech ical s an ardization

The proc d r s used t o develo this document an those int en ed for it furthe maint enanc ar

desc ibed in the ISO/IEC Dir ctives, Part 1 In p rticular the dife ent a pro al c it eria ne ded for the

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

edit orial rules of the ISO/IEC Dir ctives, Part 2 ( e www.iso.org dir ctives)

A tt ention is drawn t o the p s ibi ity that some of the element of this document ma be the subje t of

p t ent right ISO shal not be held r sponsible for identifying any or al such p t ent right Detais of

any p t ent right identified d ring the develo ment of the document wi be in the Introd ction an / r

on the ISO ls of p t ent de larations r c ived ( e www.iso.org p t ent )

Any trade name used in this document is information given for the convenienc of use s an does not

cons itut e an en orsement

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

as es ment, as wel as information a out ISO’ s adhe enc t o the WTO principles in the Te h ical

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

ISO 3 7 - 2 was pr par d b the Phy sical Tes C mmis ion of the Int ernational Union of Leathe

Te hnolo is s and Chemis s Societies (IUP C mmis ion, IULTCS) in cola oration with the Euro ean

Committ ee for Stan ardization (CEN) Te hnical Committ ee CEN /TC 2 9, Leathe , the se r tariat of

w hich is held b UNI, in ac ordanc with the Agr ement on t ech ical co pe ation betwe n ISO an CEN

(V ien a Agr ement)

It is based on IUP 8 originaly publshed in J S c.Leathe Trades Chemi s ts 44, p 3 8, (1 60)an de lar d

an off icial method of the IULTCS in 1 6 1 This updat ed ve sion was publ shed in J S c Leathe Tech

Chem 84, p 3 7, (2 0 ) an r conf irmed as an off icial method in Mar h 2 0 The same principle is

used but the t ext has be n updat ed an inclu es the n mbe of t es pie est o be taken

IULTCS, originaly formed in 1 9 , is a wor ld-wide org nization of profes ional leathe societies t o

furthe the adv nc ment of leathe scienc an t ech olo y IULTCS has thr e C mmis ions, w hich ar

r sp nsible for s a lshing int ernational methods for the samplng an t es ing of leathe ISO r co niz s

IULTCS as an int ernational s an ardizing b dy for the pr p ration of t es methods for leathe

This se on edition canc ls an r plac s the firs edition (ISO 3 7 - 2:2 0 ), of w hich it cons itut es a

minor r vision t o algn it em f) of Clause 7 with ISO 241 :2 1

ISO 3 7 consis s of the folowing part , u de the g ene al title Leathe — Phys ic al a d mecha ic al

tes ts — Dete min tio o tear lo d:

— Part 1: Sin le edge tear

— Part 2 : Do ble edge tear

IULT CS IUP 8:2016(E)

Leather — Physical and mechanical tests — Determination

Part 2:

This p rt of ISO 3 7 spe ifies a method for determining the t ear s r ngth of leathe using a double edg ed

t ear The method is sometimes desc ibed as the Ba uman tear It is a plca le to al ty es of leathe

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 241 , Leathe — Chemic al,p ys ic al a d mecha ic al a d f s tnes s tes ts — S mpln loc atio

ISO 241 , Leathe — Ph s ic al a d me h nic al tes ts — S mple pr p ratio a d c onditionin

ISO 2 89, Leathe — Ph s ic al a d mecha ic al tes ts — Dete min tio o thicknes s

ISO 7 0 -1, Metal c materials — Ve ific atio o s tatic u iax ial tes tin machines — Part 1:

Tens ion/c ompr s s ion tes tin machines – Verific atio a d c albration o the frc e -meas urin sys tem

A r ctangular t es pie e with a hole of spe if ied sha e is plac d over the turned up en s of a p ir of

holde s at ached t o the jaw s of a t ensie t es ing machine The highes for e ex ert ed d ring t earing of the

t es pie e isr corded

4 A pparatus

4.1 Tensie testing machine, w ith:

— a for e rang e a pro riat e t o the spe imen un e t est ;

— a means of r cording the for e t o an ac uracy of at leas 2 % as spe ified b Clas 2 of ISO 7 00-1;

— a u iform spe d of sep ration of the jaw s of 1 0 mm/min ± 2 mm/ min

4.2 Test piece holder , such as show n in Fig ur e 1, each consisting of a stripof s e l 1 mm ± 0,1 mm

w ide and 2 mm ± 0,1 mm thick, bent thr oug h a rig ht ang le at one en to form a rigid strip w ith a

minimum length of 1 mm ± 0,1 mm The holde s eithe fit into or r eplac thejaws of the tensie testing

machine (4.1)

4.3 Thicknes gaug e, as spe ified in ISO 2 8

4.4 Pres knife, as spe ified in ISO 241 , ca a le of cutting a tes pie e as shown in Fig ure 2 in one

Figure 1 — Test piece h lder

Dimensions in milimetr es

Key

R r adius

Figure 2 — Test piece for do ble edg e tear

5 Sampl ng and sample preparation

5.1 Sample in ac or danc with ISO 2418 Fr om the sample, cut six tes pie es in ac or danc w ith

ISO 241 , three tes pie es with the long er sides paralel to the b ckb ne an thr ee tes pie es w ith the

long er sides pe pen icular to the b ckb ne

If the e is a r q ir ment or mor than two hides or skins t o be t est ed in one b t ch, then only one t es

pie e in each dir ction ne d be taken from each hide or skin, pro ided that the o e al t otal is not les

than thr e t es pie es in each dir ction

5.2 C n ition the tes pie es in ac or danc with ISO 241

5.3 Measure the thick es of thetes pie es in ac or danc with ISO 2 89

6 Proc edure

6.1 Adjus the a p ratus so that the tur ned up ends of the tes pie e holder s are lghtly touching each

othe Slp the tes pie e o e the tur ned up ends so that the en s protr ude through the slot with the width

of the tur ned up en s p ralel to the s raight edg es of the slo Pres the tes pie e fir mly onto the holder s

IULT CS IUP 8:2016(E)

6.2 Ru the tensie tes machine until the tes pie e is torn a art an record the max imum for ce

r eached d ring tearing

6.3 Repeat 6.1 an 6.2 for othe tes pie es

7 Test r eport

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

a) a r fe enc t o this p rt of ISO 3 7 , i.e ISO 3 7 - 2;

b) thethicknes ofthe leathe in mm;

c) themean t ear lo d in newt ons (N)with the long edg e of the t es pie e cut paralel t o the b ck bone;

d) the mean t ear lo d in newt ons (N) with the long edg e of the t es pie e cut pe pen icular t o the

back bone;

e) thea e ag e t ear lo d [i.e the arithmetic mean of c) an d)];

f) thes an ard atmosphe e used for con itioning an t es ing, asgiven in ISO 241 ;

g) any deviations from the method spe if ied in this p rt of ISO 3 77 ;

h) ful detai s for identification of the sample an any deviations from ISO 241 with r spe t to samplng

IULT CS IUP 8:2016(E)

ICS  59.140.30

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