SPIN 14OULDED FILTERS
A LATERAL FILTER MANUFACTURING TECHNIQUE
REPORT NO. -RD.1593 RESTRIC D
15.6-1978
AUTHOR: J.A. Luke
ISSUED BY: I.E. Willis
DISTR13MON:
Dr. S.J. Creen
Dr. I.IF. Sughes;
Dr. ILA- Sanford
R.IL Gibb, Esq.
ILS. Wade, Esq.
ILG. Nicholls, Esq.
Herr E. Rittershaus
Dr. F. Seehofer
Mr. JLJ. Kru zynski
Dr- C.J.P. de Siqueira
Dr. D.G. Felton
Library
FROG. REP. 14.03.02/03
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BATCo document for Province of British Columbia 10
November 1999


This report deals with a new design/manufacturing
technique which
recogmises and satisfies the demanding and
Conflicting aims presented
above. Cellulose acetate is a thermoplastic and it
follows that
conventional filter rods can be modified hy the
application of heat
and pressure-even when fully hardened. The novel
technique termed
SPIN MOULDED FILTERS has been evolved to apply the
-concept to filter
manufacture. Essentially it provides a realistic
basis for ==lding or
re-shaping filter rods to give product advantages.
The technique is highly versatile and should offer
competitively
priced filters. From the outset it has been
envisaged as a multi-role
system which will allow the introduction of a
variety of sophisticated
filter designs into production even where
individual applications are
limited by small volume requirements.
The direction of further work is open to choice
and should
concentrate an design concepts which have been
identified as having the
-axi:m= chance of commerc ial success.
It is recommended that Associates should be
actively encouraged
to investigate the possible application of Spin
Moulded Filter (S.N.F.)
designs in their own products and participate in
the development of
specific S.M.F. machine designs to allow these to
be produced.
Manufacturing licensing arrangements with a
machinery supplier should
be pursued as quickly as possible to allow
Associates identifying a
specific need to move quickly into production.
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BATCo document for Province of BritiSh Columbia 10
November 1999


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IN-TRODUCTION
Interest in this technique arose from work on two
projected filter
designs which proved extrem ely difficult to
manufacture by conventional
longitudinal-flow rod making processes. Th e
filters were the H.E.X. or
High-efficiency cross-flow filter and the carbon
off-taste reduction
filter (3). The former consisted of a filter-paper
tube closed at one
and and suspended in a hollow tube with an annulus
between them which
was sealed at the opposite end to the tube seal.
The latter f ilter
required that the particulate phase smoke was
diverted past an active
carbon bed without direct physical contact, thus
reduaing or preventing
deterioration of the adsorption efficiency of the
bed whilst allowing
diffusion of the vapour.phase components into the
bed. In both cases
the projected filter designs were elaborate and
complicated and proved.
to be disadvantageous from the point of view of
successful commercialisation.
The evolution of the Spin Moulded Filter technique
arose from
certain features of the R.E.X. prototype process.
Once conceived the
fa~i wider potential application became apparent
and during the course of
investigation into the possibility of producing
the specific designs
for the above filters, a number of other design
possibilities were
identified and evaluated already. Two of these are
the Dumbell Filter
(4) and the Grooved Filter, which will be the
subject of a forthcoming
report. These filter designs and machinery for
their manufacture are
being moved towards early co-ercial application.
In addition to the
=ore complicated filter designs being considered
certain types of end
-patterhs can be produced on filters to give
visual attractiveness and
impact to the filters.
BATCo document for Province of BritiSh Columbia 10
November 1999