Cori @r
MCN@TREAI..P O.,'ANAOA
Mr. PAul Cannowav,
BAT Company Ltd.,
P.O. Box 4 Ft 2,
Westminster House,
7 Millbank,
London SW1F 3JF,
England.
February 21. 1973
.Dear Pau I ,
With reference to your letter dated Feb. 13th,
concerning information on the application of porous cork
tipping, we would submit the following:
When tipping adhesive is applied to porous cork
it does not completely block the porosity of the cork tipping.
The amount which it does reduce the porosity is governed by
the type of adhesive, its viscosity, and the thickness of the
film which is applied. We are using an adhesive supplied by
a Canadian firm, Industrial 'No. R0214 adhesive supplied with a
viscosity of 2qn( centipolses. Our Matinee K. S. cigarettes
for example. with overall gluing of the tipping using this
adhesive and a glue roller undercut of nnI211 yield a TPM-Nic
value of 14.4 mg. As this value was somewhat higher than our
target of 11.5 mg we utilized a Hauni skin tipper on a Hauni
Max 5 assembler equipped with a multiple rolling head to
pattern the adhesive on the cork tipping so that we had a
3 1/2 mm unglued slot centered around the perforations. The
Hauni skip tipper also applies glue to the lap, so that the
lap is sealed accross the Perforated area. Und er these
conditions the TPM-Nic yield of the cigarette was reduced to
OM, our target of 12.5 me.
From the above it can be seen that there are four
criteria being used to control the tar delivery of a given
tobacco column. The first is the porosity of the tipping
itself, the second is the porosity of the plug wrap used to
wrap the filter. The third is the adhesive which reduces but
does not eliminate the porosity of the tipping while the
fourth is the size of the unglued slot which is used to tailor
the tar yields to the exact figure desired.
I trust that the above will prove helpfull.
With kind regards,
Yours lincerely,
SMC/cr S.M. Candlish. 0C
BATCo document for Province of British Columbia 15 April 1999