belt drier type B-72 was originally designed to replace traditional
drum driers for loose fibres.
Later, with certain specific modifications, it was also used to
process dyed acrylic tow, polypropylene and polyester tow, to carbonize
wool in loose fibres after treatment in acidifying vats and to dry
cotton-wool, ramie, rayon, etc.
main features of the machine are:
belt made of perforated stainless steel sheets or carbon steel
sheets for wool in loose fibres. If cotton-wool has to be dried,
a special textile mesh is used, specifically designed not to retain
by means of warm air is which is uniformly blown on the whole
conveyor belt surface and symmetrically re-circulated in the lower
part through two side channels. There is consequently a slight
depression on the conveyor belt surface which ensures fibre stability
on the belt in spite of the high ventilation
drying down to the required residual moisture rate
specific production output.
drier can be heated with steam, diathermic oil or superheated water
by means of steel-tube heat exchangers, tested to 40 bar pressure,
or gas burners: it is equipped with large air filters of stainless
steel filter mesh, which are readly accessible and removable for
order to ensure uniform residual moisture after drying, it is essential
to feed the material uniformly onto the belt. Hence various feed
mechanisms are used as follows:
for loose fibres are equipped with a belt with stainless steel
pins, a distribution comb with special divice to adjust distance
from the belt, al large diameter delivery roller to process long
fibres and cleaning brushes.
There are independent speed control units for the belt and the
tow, single or multi-head plaiters are used, if necessary equipped
with special compressed air (ALEA-patented) openers.
first photo shows a steam-heated plant, comprising a B-72 with feeder
for loose fibres equipped with opener and storage belt. The following
photograph shows a 4-chamber machine with feeder for hydroextracted
pictures above show:
1.plant comprising a drier for loose fibres and a drier for hydroextracted
tow, both steam heated
2.detail of the outlet of a B-72 with pick-up of dry tow, driven
by a set of photocells.
3.detail of the distribution comb in a 4-chamber machine processing
4.detail of the delivery of dry cotton-wool on a conveyor belt.
the modular construction is one of the features of the B-72 (each
unit is 3250 mm long), each drier can be arranged according to the
required production output.
The machine is manufactured with belts of 5 different widths: 1300,
1600, 2000, 2500, and 3000 mm.
section of a B-72: fans are mounted on the top of the machine, linked
to the motor through a special self-cooling coupling. Side filters
can readily be cleaned. Re-circulated air is filtered, drawn by
fans and heated via burners or batteries.
Longitudinal section of a B-72 chamber: note the position of air
heating batteries and the path of air which is uniformly conveyed
onto the material to be dried. To ensure a uniform drying effect,
air is blown from above downwards.
There are various design combinations as follows:
- a chamber equipped with feeder for hydroextracted loose fibres
with storage belt
- two chambers for leviathan-washed wool. The intermediate feeder
- without the storage belt - processes partly dried wool, thus avoiding
any damage to the fibres
- a chamber equipped with opening device for hydroextracted loose
fibres, pneumatic conveying system and feeder
- a chamber with feeder for tow, equipped with pneumatic opening
and cooling devices (max. 12 opening devices).