Tiêu chuẩn iso 12195 1995 scan

tower whic h thres es an clas ifies the resid a l stem from the lamina in a controled man er.. To ac o ty pes can a lso difer in the a irflow ra te req ired to se a ra te the stem from t

T aba c ba th - D& termina tion de la teneur en c& es rksid eles

IS0 1219 :19 5(E)

IS0 (the interna tiona l O rganiza tion f or Stan ardiza tion) is a worldwide

f edera tion of na tiona l stan ard b dies (IS0 memb r b dies) T he work of

a nd non-governmental, in la ison with ISO , also ta e pa rt in the work IS0

cola ora tes c losely with the Interna tiona l Electrotec hnic a l Commis ion

(IEC ) on a ll maters of elec trotechnic a l stan ardization

circulated to the memb r b dies for votin Publc a tion as an Interna tiona l

a vote

to ac c o

An ex A forms an integra l pa rt of this Interna tional Stan ard An exes B to

D a re f or informa tion only

0 IS0 19 5

All rig ts re erved Unle s oth rwis spec ifie , n p a rt of this publc atio may be repro uc ed

or uti z d in an form or by an mean , elec tro ic or mec hanic al inc lu in ph toc opy in a nd

microfim, with ut permisio in writin fom th publs er

Interna tio a l O rganizatio for Stan a rdiza tio

Cas po tale 5 l C H-121 Ge ev e 2 l Switz rlan

Printe in Switz rlan

i

T hreshed tobacco - Determination of residual stem

c ontent

T his Interna tiona l Stan ard sp c ifies a method for the

to ac c o

I is a plc a ble to strips a risin from the o era tion of

thres in or han -strip in lea f to ac c o, whic h c an b

from an to ac c o ty pe inc lu in flue-cured, burley an

ciga r to ac c o

to ac c o strips an p s in it hrou h a stem tester

2 Definitio s

For the purp ses of this Interna tiona l Stan ard, the

2.1

stem: Main vein of a to ac c o lea f

lea f

lamina

of to ac c o le ves by mec hanic al me n

inta ct

tower whic h thres es an clas ifies the resid a l stem

from the lamina in a controled man er

given in 3.1 to 3.1 , an a re i u tra ted in fig re 1

3.1.1

manometer

interna l wal T his is to avoid a ir turbulence an th s

i us tra ted in fig re 2

a pp ratu an set to zero I in icates the a ir veloc ity

3.1.2 Stem-deflec tor pla tes

a nd lost to the test T he f irst is fited to the en of the

vibra tory c onv ey or fe din into the to of the thres er

thres er s a ll b remov ed (se 3.1.8)

3.1.3 T hres er, havin the folowin c harac teristic s.

Se fig re B.1 an ta le B.1 for more deta ils

Both ta ngentia l se a ra tor rota ry

3.1.7 Airinlet v anes

u ed to a dju t the a ir flow throu h

in the ta ngentia l se arator

is sited a t the a ird ct inlet b low the

deflec tor pla te is f ited-a t the b se of

the thres er (se 3.1.2) I req ired, a

s p orted by a wire grid

T he vibra tin c onv ey or sc re n s a ll hav e a 2 ,4 mm

c le ranc e at the p int of ex it from the se ara tin

tower to alow the “he v ies” to p s throu h to the

thres er

3.1.10 Fan

T he fan s ould b c ap ble of providin an a irf low ra te

c han es in a ir den ity at hig er altitu es

3.1.1 Dis s

Strips f or diferent to ac c o ty pes c an dif f r in their

era tic res lts

2

To ac o ty pes can a lso difer in the a irflow ra te

req ired to se a ra te the stem from the strip s The

sta nda rd air flow for these to ac os

fig re C

to a cc o ty pes a re deta iled in ta ble 1

prod c t c olec ted from the stem tester (3.1) a nd, after

me n of a siev e-ty pe s a ker

folowin c ha rac teristic s

Ellptical dia meter

Al siev es s a ll b of the sta nda rd size 2 3,2 mm in

nest together to form a sta ble siev e sta c k in the

(se fig re 61,

b ) 2 0 mm sieve,

d) pa n

1) An example of a s ita ble siev e sh k er a v a ila ble com m ercialy is th C.E Tyler R o-Tap, Mo R H-19, Mo B

This inform a tio is giv en for th co v nie ce of u ers of this Interna tio a l Sta d rd a d d es n t co stitute a e d rseme t

by IS0 of th pro u t n me Equiv ale t e uipme t may b u e if it ca b sh wn to le d to th same res lts

3

T ob c c o-stip f ee c nv ey r

C ontol pa nel

IDamper Cl

Sep ra tin tower

Fig re 2 - S ta ndard sta tic -p res ure ta ppin a ppa ra tu

5

0 3.97 m flat-h ad riv ets

Deflec tor p late

I) This angle may hav e to be c an e to s it s me ma chin s

F ig re 3 - Inlet of thres er stem-deflector pla te

6

A ttach p late u in c u ters n

2B s rews ta p p ed into sid

y

Air inlet

3

Plate to c v r

a) C ro s-s ctio al sid view of d ct s owin p ositio of p late

b ) F ul-s ale cro s s ctio of p late

Us temp late with this c nto r

Fig re 4 - O utlet of thres er stem-deflector p late

7

Damper C (o be remov ed)

Fig re 5 - L oc ation of damp rs

Dime sio s in mi mete

I

1

2.78

NOT E - This 2,3 m slote -plate s re n sha ll b fite to a sta d rd size siev e, 2 3,2 m in diameter a d 5 ,8 m d e

Fig re 6 - A 2 8 mm sloted-pla te sc re n for stac ked-siev ety pe stem s a er

a

4 T est meth d

flow rate, an dis ha rged into a b in T he “hea v ies”

from this se a ra tion a re returned to the thres er for

rethres in T he o era tion contin es for 4 min when

the “hea v ies’-dis ha rge do r a utoma tica lly o en an

dis ha rges the resid a l stems into a conta iner for

weig in

D iferent typ s of to a cco str ip , with diferin bulk

diferent airflow ra tes in the thres er an diferent

airflow ra tes in the se a ra tin tower to a chiev e the

req ired se a ra tion of stem an la mina

En ure the airflow ra te throu h the tower se a ra tor

is set to sta nda rd in ac orda nce with an ex A T he

to a cco typ s is giv en in ta ble 1 If a sample is ta ken

ta ken or can b the recombined resid e from a la mina

strip p artic le size test 2)

the se a ra tin tower do rs a re c losed

a) the fa n,

b ) the 14 / l 8 tangentia l “hea v ies’-se a ra tor air loc k,

c) the 14/2 tangentia l “lg ts’-se a ra tor airloc k,

d) the thres er,

e) the v ib ratory conv eyor,

f ) the win ower

4.2.3 Set the a utoma tic timer to exa ctly 4 min (This

allows 16 s for the sample to fe d into the thres er

a nd 8 s for the thres er to clea n the “hea v ies”.)

that its rea din is the same as that a chiev ed d rin

the setin -up proced re I it difers from this fig re,

then c eck for p s ible cau es s c a s those giv en in

proced re deta iled in an ex A

b uton T his a utoma tica lly starts the timer As the last

resid al strip p artic les from the fe d conv eyor into the

thres er Afer the test time of 4 min, the “hea v ies”

4 2.4 R eturn the lg t strip s c olec ted in the bin to

ced re sta rtin from 4 2.2 C olec t an additional stem

se a ra ted an ad it to tha t from the fir st pa ss Weig

the stem sample to the nea rest +l g

Turn the p wer of

4 2.5 When samples a re tested a t freq ent interv als,

for q a lity c ontrol or for other purp ses, it may b

15 g)

S tart the siev e-ty pe s a ker with the hammer en aged

a nd simulta ne u ly star t a sto c lock or elec tronic

the siev e sta c k

2) IS0 1219 :19 5, L af to ac o - Determin tio of strip pa rticle size

9

5 Expres io of res lts a)

(Ma ss of stem o 2.3 mm s re n) x

T%

C alc late the total stem c ontent a s a p er c entage, a s

m is the in ivid al ma ss, in gra ms;

gra ms

6 T est r e p or t

T he test r ep or t s all sp c ify the r es lt(s) ob tained

s all also mention al op er atin details not sp ec ified

this Inter national S tandard or r egar ded a s op tional,

together with details of a ny inc idents whic ma y ha v e

influenc ed the test r es lt(s)

C a lc ula te the p erc entages of the var iou c ategor ies of

T he test r e p or t s all inc lu e al infor mation neces a ry

stem in acc orda nce with 4 3 a s folows:

for the complete identific ation of the samp le

10

Q IS0

IS0 12195:19 5(E)

En ure the stem tester is set up in a ccordan e 3.1.1

of the se a ra tin tower with p lastic a dhesiv e ta pe,

lea v in a 13 mm clea ra nce b twe n the v ibra tory

s re n an the lower ed e of the p late F ix a 5 mm

wide, 18 mm lon , piece of p lastic a dhesiv e ta pe to

w l an in the centre of the s re n This is i u tr ated

in fig re A.1 En ure the “hea v ies’-dis ha rge do r is

O pen the se a ra tin tower do r an pla ce a t ran om

ten he v y an ten lg t dis s on the p la stic ta pe (T he

des rib d in 3.1 1.) T urn the p wer on S tart the fa n

C lose the se a ra tin tower do r Alow 4 s for the air

mak e a note of its rea din

simulta ne u ly T he lg t disc s s ould c olec t in the

la mina ho p r an the hea vy disc s in the “hea v ies”

tower do r T his wi a llow the rema inin disc s in the

tower to dis ha rge throu h the “hea v ies’-dis ha rge

do r

c olec ted in the “lg ts” bin an in the “hea v ies” bin

R epla ce the 2 disc s on the p la stic ta pe, close the

of the 14/2 tangentia l “lg ts” se a ra tor, se 3.1.8)

a s folows:

b) if more tha n one he v y dis is c a rried ov er to the

“lg ts” b in, red ce the static pres ure by c losin

dis s a re dis ha rged throu h the “hea v ies”dis ha rge

do r or at lea st nine lg t disc s a re c olected in the

the p lastic ta pe an aluminium bla nkin pla te from the

den ity , altitu e an temp ra ture

When the se a ra tin tower is set to sta nda rd air flow

dis s se a ra te c lea nly into ten lg t an ten he v y

dis s most of the time T he tolera nc e of one dis in

sma ll ireg larities in the airflow distrib ution in the

tower ca usin he v y disc s to b c a rried ov er with the

lg t ones

If damp r A is fuly o en an there is in ufic ient air

flow to c a rry the lg t disc s ov er, then c eck to se

an that the fa n is ru nin a t the a ppro ria te sp ed

1

b etwe n v ibra tory sre n a nd L ower

e g of pla te Pla te h ld in

Po itio by Plastic ta p e (as s own)

dime sio s a re:

L Two h le ream ed, 0 9.5 m

NOT - Se ta ble 8.2 for dim ensio s

Dime sio s in mi metres

T otal No of sp cer plates

T otal No of rotor plates

T a ble B.2 - Sta nda rd dimen ion of ba sk et

Dime sio s in mi mete

Sta nd rd dime sio

vein Howev er, only stem a ov e a c erta in thic knes is

u ualy rega rded as o jec tiona ble, so an mec hanic al

a nd stan ardized to, rec og ize this a rbitra ry criterion

up

Aerody namic se a ration as u ed in the C ardwel-ty pe

s tem-in-lamina tester c an ot give a s arp se a ration

in a irflow ra te or a ir dis tribution in the se a ratin

tower wi also afec t the res lt

C han es in a ir den ity afec t the lf t c harac teristic s in

c han es in a irflow ra te to c omp n ate f or them

A stra ig torwa rd veloc ity corection may not alway s

tester to b e siy stan ardized

is e siy s own that there is a lnea r relation hip

mas of a dis ca rried over into the air stre m

folowin c haracteristics

a ) Pro y lene is a rela tively low-den ity ma teria l so a

disc s to c over the same ran e, givin les c ontrol

16

c l

virtua lly non-hy grosc opic Some plastic ma terials,

dramatic efec t on the se a ratin static pres ure

req ired to lf t the disc s

nip les a p a r to ac t as a form of a rody namic

b la st they a re not remov ed from the disc s

A dra win of the dis desig is given in fig re C I

static tower pres ure a t whic h

T his rela tion hip ena les a set of lg t disc s an he v y

disc s to b sp c ified f or an req ired sta tic pres ure

in the se a ratin tower

in p c ted by senior lea f an q a lity control p rson el

re resent their v iew of o jectiona ble stem T hese wi

hig er static pres ure ran e containin only the la rger

sta tic pres ure a t whic h the selec ted samples were

se arated is rec orded an a set of disc s man fac tured

desc rib d in C 1.3

e c h ty pe of to ac c o s trip req irin testin f or stem in

la mina T he airflow c ha ra c teristic s of most c iga r

la mina ta rgets a re a lso lk ly to difer b twe n

to ac o ty pes

T he ma jority of strip s sampled for stem-in-la mina

testin a re ta ken a t the en of the thres in lne as a

ra nge from 16 % to 2 % moisture c ontent

T ob c o strip s a re also, from time to time, sampled

an tested from the ex it of the redrier an out of the

blen in of strip s d rin c iga rete ma nufa cture T he

L ig t diss (IO)

out c arefuly to a v oid degra da tion

recon itioned to a t lea st 15 % to 16 % moisture

content b fore testin

content of the la mina strip s sampled from all test

loc a tion a re lk ly to b simiar, there is no g a rante

from within one sa mpln loc ation

it is not ju t diferenc es in moisture content a t the

time of the test that may affec t the res lt but a lso

Heav dis s (IO)

Dime sio s in mi mete

Q IS0

IS0 12195:19 5(E)

a ) Check an clea n daily the folowin

hole is fr ee of to ac c o fines an dirt an the

T he vibr a tor y scre n: en ure the wir e mes

sc re n has not b c ome b lin ed with to acc o

d s t

- d ct inle t b low the thr es he

- the vibr a tor y c onv ey or scre n

Check we kly the folowin

but lo k for ex c es ive we r an elon a tion of

the holes in the te th

2) The air-inle t g ide v ane s etin s

disma ntled an clea ned thor ou hly

Ma intain the stem tes ter in ac c ordanc e with the

man facturer’s ma nua l

19

D~I+@oB: tob c c o, te ts, d terminatio , stems (plants), siev e analy sis

Pric bs d o 19 p g s