er. c.o. -rcok a
(,C-?./zj 17th :u:-7, 1981
Mr. S. Can-44sh,
1z,r,eriA1 TxZaccco UmItud,
P.O. !ox 03cc,
@,rwntrea'
P. -.. ,
@@-@@a -.JC .-LA.
Dear SUn.
CO Reduction
was to 3ob Wade durinc; his current visit and .1w asked
how much ;roqrsas had :)eon s;&d* with low car.",won monoxide cigarettes.
You have recall t@.e recent rrogreas reparts. which slow that very low
CO cicarsttes car. be wtee whilat rotAining reasonable tar doliverf.
t:a aentilouplo t!iat a torn I;Tcaediate pro!,lari was ra&ucinq the
rat-Le to te-laj 1:1 for yccLr current full flavour civarettes.
The rrc-.e-.t MCC -!czirna were ok ta!Ae@!, partly as a result of usinq
the Pt': ccx,.1utei rw
ra=e. Ths u0st injortant factor seem to be filter
ventilation and r havo plotted C0/11.@ ratio versus filter ventilation and
filtex P.U. in t:-.u attaachdd figures 1 azd 2. Mese results vers obtained
by cm-,uter calculation u*Lnq State Express 355 in figure I and a current
S" product in !,-lure 2. The preftwUons show that It a reduction In
filter P.O. is ccnransated by filter vtatIlatiom, the CO/TAR ratio Ls
maskedly raducod. Ind"4, this concept appears to bave bosen used by
Philip V4=IS for naruoro LA a worldwide ventilation programse. they
used mine 1mrforated tippLaq (noo-visibl,s) producing a ventIlAtiM Of
10 - 134 and achieved a 2 - 3wq tar reduction whilst 01&4M*8jM1j4 filter
presswe drop at G.kn W.G. and paper paxamabAlity at 23 C.D.
Tb4 current work suqqesta that this is a simple meass of
improving the ratio whiLat maintaining your current deliveries.
The paper permeability for 5.1o 55S Is 43 C.U.
you say already be following this Line of thought and If got
this will only be coafixuatLen of the appmask, but I felt It VOrthVIdIs
to write.just 13L C"*.
With kind r"ardso
ITS
N.)
N.o.o. cc Dr. L.C.F. Blac:@=an
BATCo document for Province of British Columbia 21 April 1999