Tiêu chuẩn iso 12625 6 2016

© ISO 2016 Tissue paper and tissue products — Part 6 Determination of grammage Papier tissue et produits tissue — Partie 6 Détermination du grammage INTERNATIONAL STANDARD ISO 12625 6 Second edition 2[.]

Tissue paper and tissue pr oducts —

Part 6:

Pa ier tissue et produits tissue —

Partie 6 : Déte mination du gramma e

S con edition

2 16-1 -0

Refer ence n mb r

ISO 1 62 -6:2 16(E)

COPYRIGHT PROTECTED DOCUMENT

© ISO 2016, P blshed in Sw itz rlan

A ll rig hts r eserved Unles otherw ise spe ified, nopar of this p blc tion ma y be r epr od c d or utilz d otherw ise in an form

or b an me ns, ele tr onic or me hanic l, inclu in p oto opying , or postin on the internet or an intranet , w ithout prior

written permis ion Permis ion c n be req esed from either ISO at the ad r es below or ISO’s member bod y in the c u try of

the r eq eser

F reword i v

1 Sc ope 1

2 Nor mati ve r eferenc es 1

3 Terms an definitions 1

4 Principle 1

5 A pparatus 2

6 S mpl ng 2

7 Co ditioning 2

8 Preparatio of test piec es 2

8.1 General 2

8.2 Cutting of thetes pie es 3

8.2.1 General 3

8.2.2 Siz of tes pie es 3

8.2.3 Numbe of tes pie es 3

8.3 Uncut inished prod ct 3

8.3.1 General 3

8.3.2 Siz of tes pie es 3

8.3.3 Numbe of tes pie es 3

9 Proc ed re .4

9.1 Dete mination of the mas of the tes pie es 4

9.2 Dete mination of the ar ea of the tes pie es 4

10 Calculation 4

1 1 General 4

1 2 Mean an s andar d deviation of g rammag e 5

11 Test rep r t 5

A nne x A (informative)Precisio 7

Biblog raphy 10

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

For an ex lanation on the meaning of ISO spe ific t erms an ex r s ions r lated to conformity as es ment,

as wel as information a out ISO’s adhe enc to the Wor ld Trade Org nization (WTO) principles in the

Te h ical Bar ie s to Trade (TBT) se the folowing URL: www.iso.org/ iso/for word.html

This document was pr p r d b the Euro ean C mmitt ee Stan ardization (CEN) Te h ical C mmitt ee

CEN /TC 1 2, Pulp, p pe a d b ard, in cola oration with ISO Te h ical Committ ee TC 6, Pa e , b ard

a d p lps , Subcommitt ee SC 2, Tes t meth ds a d q alt y s pec ific atio s fr p pe a d b ard, in ac ordanc

with the Agr ement on t ech ical co pe ation betwe n ISO an CEN (V ien a Agr ement)

This se on edition canc ls an r plac s the f irs edition (ISO 1 6 5-6:2 0 ), w hich has be n

t ech icaly r vised with the folowing chang es:

a) a new subclause, 8.3, hasbe n ad ed;

b) formulae we e ad ed t o clarify Clause 1 ;

c) in An ex A, the pr cision data has be n updat ed;

d) this document has be n edit orialy updat ed

A l s of al p rt in theISO 1 6 5 se ies can be fou d on theISO websit e

Tissue paper and tissue products —

Part 6:

This document spe ifies a t es method for the det ermination of grammag e of tis ue pa e an tis ue

prod ct

2 Normati ve r eferences

The folowing document ar r fe r d t o in the t ext in such a wa that some or al of their cont ent

cons itut es r q ir ment of this document F or dat ed r fe enc s, only the edition cit ed a ples F or

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

ISO 1 6, Pa e a d b ard — S mpln to dete mine a e a e q alt y

ISO 1 7, Pa e , b ard a d p lps — Sta dard atmos phe e fr c onditio in a d tes tin a d procedur fr

mo itorin the atmos phe e a d c onditio in o s amples

3 Terms and definitions

F or the purposes of this document, the folowing t ermsand definitions a ply

ISO an IEC maintain t erminolo ical data ases for use in s an ardization at the folowing ad r s es:

— IECEle tro edia: a aia le at ht p:/ www.ele tro edia.org

— ISO Onlne brow sing plat orm:a ai a le at ht p:/ www.iso.org o p

3.1

grammag e

g

mas of a unit ar a of tis ue p pe or tis ue prod ct as det ermined b the proc d r in this document

Note 1t o entry: Gramma e is e pres ed in grams per sq are metre (g m

2

)

4 Principle

The mas an ar a of a t es pie e or t es pie es of eithe a tis ue p pe or a tis ue prod ct is measur d

an the grammag e is calculat ed as the mas pe unit ar a of the t es pie es taken F or f inished pa e

prod ct , the grammag e ma also be calculat ed from the mas an ar a of a spe ified n mbe of the

finished tis ue prod ct it ems Pr cision data ar a ai a le in Annex A

5 A pparatus

5.1 General

The b lanc shal be plac d on a horizontal surfac fr e from ext ernaly in uc d vibrations

5.2 C t ing devic e

The cut ing devic shal be ca a le of r peat edly cleanly cut ing t es pie es of the same nominal siz ,

w hose ar a falswithin ± ,0 % of a k own ar a This shal beche ked fr q ently b measur ment an ,

pro ided that the a o e ac uracy is at ained, the mean ar a o tained in these che ks shal be used for

calculating grammag e

W ith c rtain ty es of tis ue p pe an tis ue prod ct, it wi be foun , aft er car ying out this

det ermination of ar a, that t es pie es can ot be cut with the ac uracy jus defined In such ins anc s,

the ar a of eve y t es pie e shal be det ermined in ivid aly

5.3 Balanc e

The devic t o det ermine the balanc shal ha e a measuring ac uracy of 0,0 1 g

5.4 Leng th me sur ement devic e

The length measur ment devic shal be a rule , an ele tronic digital rule , a scanne or any othe devic

with a minimum measuring ac uracy of 0,5 mm

If the t es s ar being made t o ev luat e a lot, the sample shal be sele t ed in ac ordanc with ISO 1 6

If the t es s ar being made on anothe ty e of sample, make sur that al spe imens taken ar

r pr sentative of the sample Each t es pie e shal be fr e from pe forations an fault not normaly

inhe ent in the tis ue

Condition the samples ac ording to ISO 1 7 an k eep them in the s an ard atmosphe e throughout

the tes

Con itioning shal be done prior t o the pr paration of t es pie es

8 Preparation oftest piec es

Tes pie es shal be fr e from ar as containing c eases, dirt or visible damag e Tes pie es shal be

made of eithe ar as cut from spe imens of tis ue p pe or tis ue prod ct ( e 8.2), or made of w hole

finished prod ct ( e 8.3)

8.2 Cut ing of the test pieces

8.2.1 General

In the case w he e t es pie es ar cut from spe imens of tis uep pe or tis ue prod ct , the t es she t or

s ack of supe imp sed t es she t can be plac d betwe n two sup orting she t of p pe , such as offic

co y p pe , in orde t o o tain t es pie es with clean cut edg es an dimensions ofthe ac uracy spe if ied

8.2.2 Size of test piec es

Sinc tis ue p pe an tis ue prod ct v ry gr atly in dimensions, it is only p s ible t o give g ene al

guidanc r g rding the dimension of the t es pie e or t es pie es

The minimum ar a of an in ivid al t es pie e shal be at leas 1 0 cm

2

One t es pie e ma , if ne es ary,

becomp sed of seve al smale pie es

8.2.3 Numbe of test piec es

Using the cut ing devic (5.2), cut at leas 1 t es pie es The mas of a minimum ar a of 1 00 cm

2

shal

be det ermined, an convenient larg er ar as shal be taken in complanc with the pro isions of this

document

8.3 Uncut finished pr oducts

8.3.1 General

In the case w he e t es pie es ar comp sed of finished tis ue prod ct , t es pie es shal le unfolded an

flat with no t ension a pled

If a scan e is used for this measur ment, ensur that the scan er-co e is sufficient in siz t o cause the

it em t o le flat

If a rule is used, it shal be of dimensionslarg er than the t es pie e

8.3.2 Size of test piec es

Sinc tis ue p pe an tis ue prod ct v ry gr atly in dimensions, it is only p s ible t o give g ene al

guidanc r g rding the dimension of the t es pie e or t es pie es

Using a measuring devic (5.4) as desc ibed, the minimum ar a of an in ivid al t es pie e shal be at

leas 1 0cm

2

One t es pie e ma , if ne es ary, be comp sed of seve al smale pie es

8.3.3 Numbe of test piec es

The minimum n mbe of t es pie es shal be 1 The mas of a minimum ar a of 1 00 cm

2

shal be

det ermined, an convenient larg er ar as shal be taken in complanc with the pro isions of this

document

The 1 or mor t es pie es ( finished prod ct it ems) shal be sele t ed from the sample in a ran om

man e so as t o r pr sent v riation in siz an mas of the f inished prod ct it em pr sent in the sample

In any case, seq ential finished prod ct u it shal neve be t est ed, ex cept in cases w he e the sample is

ve y lmit ed in q antity

9 Proc edure

9.1 Deter mination of the mas of the test piec es

Det ermine the mas of each t es pie e on the b lanc (5.3) t o the near s 0,0 1 g

It is r commen ed, espe ialy w hen deal ng with smal t es pie es, that t ouching the t es pie es with

b r han s is a oided

If the s an ard deviation is not ne ded, the t otal mas of al 1 or mor t es pie es ma be det ermined

b weighing al t es pie es t og ethe

Any deviation from the proc d r desc ibed a o e shal be ex lcitly mentioned in the t es r p rt

9.2 Deter mination of the area ofthe test piec es

9.2.1 When tes pie es ha ve be n cut to spe ified dimensions as desc ibed in 8.2, dete mine the area of

each in ividual tes pie e

9.2.2 F r the dete mination of g rammag e on finished p pe prod ct , the total ar ea shal be measured

to an ac uracy of bette than 1 % using a measuring devic (5.4) as desc ibed

When the t es pie es ar measur d, they shal l e unfolded and flat with no t ension a pled

If a scanne is used for this measur ment, closing the scan co e is usualy sufficient t o cause the it em

t o l e flat Likewise, placing a st eel rule along the edg e is usual y suff icient Whe e a digital rule is

used, thefinished prod ct should be flatt ened using a flat pie e of plas ic a pro imat ely 4 mm thick, of

dimensions larg er than the t es pie e, or a simi ar flatt ening means

9.2.3 A ny deviation from the proc d r e descr ibed a o e shal be ex plcitly mentioned in the tes rep r t

10 Calculation

10.1 General

Calculat e the grammag e t o thr e signif icant figur s for each t es pie e using F ormula (1):

g

m

A

6

(1)

w he e

g is thegrammag e of the t es pie e, in grams pe sq ar metr ;

m is themas of the t es pie e, in grams;

A is thear a of the t es pie e, in sq ar mi lmetr s

10.2 Mean and standard deviation of g r ammag e

Calculat e the mean grammag e of the sample an ex r s it t o thr esignif icant f igur s using F ormula (2):

g

g

n i n

i

=

=

∑

1

(2)

w he e

g is themean grammag e of the sample, in grams pe sq ar metr ;

g

i

is thegrammag e of the t es pie e, i, in grams pe sq ar metr ;

n is then mbe of the t es pie es

Calculat e the s andard deviation an ex r s it t o two significant f igur s using F ormula (3):

s

n i n

i

=

−

−

=

∑

1

2

1

(3)

w he e

g is themean grammag e of the sample, in grams pe sq ar metr ;

g

i

is thegrammag e of the t es pie e, i, in grams pe sq ar metr ;

n is then mbe of t es pie es;

s is thesample s an ard deviation

If t es pie es ar weighed t og ethe , calculat e the grammag e using F ormula (4 ):

g

m

i i n

i

=

×

×

=

∑

1

6

w he e

g

i

is thegrammag e of the t es pie e, i, in grams pe sq ar metr ;

n is then mbe of t es pie es;

m is themas of the t es pie e in grams;

A is the ar a of each t es pie e, in sq ar mi imetr s, w he e tes pie e ar as ar ex ctly eq al

( e 5.4)

11 Test r eport

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

a) a r fe enc t o this document, i.e ISO 1 6 5-6;

b) thedat e and plac of t es ing;

c) the desc iption an identif ication of the sample, such as the prod ct cat eg ory an dimensions

un e t est ;

d) the grammag e, in grams pe sq ar metr , rou ded t o the f irs de imal plac , n mbe of single

v lues, s an ard deviation r p rt ed t o two signif icant f igur s an coeff icient of v riation, r p rt ed

t o two signif icant f igur s;

e) w hethe the t es pie es ar weighed t og ethe or not ( if they ar weighed t og ethe , the s an ard

deviation an coeff icient of v riation can ot becalculat ed);

f) any deviation from this document an any othe cir ums anc s that ma ha e afe t ed the t es

r sult ;

g) thecon itioning atmosphe eused

A nne x A

Precision

A 1 General

In Mar h 2 1 , an int ernational rou d-ro in was pe formed with eight tis ue pa e s an tis ue

prod ct b eight dife ent la orat ories ac ording t o this document Thr e of the as es ed conve t ed

prod ct we e measur d with b th methods desc ibed in this document (det ermination on cut t es

pie es an uncut t es pie es)

The r sult ar pr sent ed in Ta leA.1 t o Ta le A.4

The calculations we e made ac ording t o ISO/TR 2449

[4]

an T AP I T 1 00 sp-0

[5]

The r peata i ity s an ard deviation r port ed in Ta le A.1 is the “ po led” r peata i ty s an ard

deviation, that is, the s an ard deviation is calculat ed as the ro t-mean-sq ar of the s an ard

deviations of the p rticip ting la orat ories This dife s from the conventional def inition of r peata i ty

in ISO 5 2 -1

[2]

The r peata i ty an r prod cibi ity lmit r port ed ar es imat es of the ma imum dife enc w hich

should be ex e t ed in 1 of 2 ins anc s, w hen comp ring two t es r sult for mat erial simi ar t o those

desc ibed u de simiar t es con itions These es imat es ma not be v ld for dife ent mat erials or

dife ent t es con itions

NOTE 1 T e repe ta ility stan ard deviation an the within-la oratory stan ard deviation are identical

However, the reprod cibility stan ard deviation is not the same as b tween-la oratories stan ard deviation T e

reprod cibility stan ard deviation inclu es b th the b tween-la oratories stan ard deviation an the stan ard

deviation within a la orat ory, viz.:

=

but

NOTE 2 2,7 = 1,96 2, provided that the test results have a normal distribution an that the stan ard

deviation, s , is b sed on a larg e n mb r of t ests

A 2 Measurement on cut test piec es

Half of the particip ting la orat ories used man al cutt ers and half used aut omat ed pu ches