STUDY OF THE FLOW MECHANISM FOR MOLTEN BASALT
OVER THE SURFACE OF FEEDERS
MADE OF HIGH-TEMPERATURE ALLOYS
A. G. Novitskii
and M. V. Efremov
Translated from Novye Ogneupory, No. 2, pp. 43 – 46, February, 2007.
Original article submitted May 20, 2006.
A study of the mechanism of wetting for spinneret materials by molten rocks of the basalt type is provided.
A floating mechanism is described for a spinneret under the action of electrochemical transfer forces.
The change in wetting angle under the action of electrochemical transfer forces is demonstrated.
In the production of mineral fibers in units for processing
a melt there is mainly use of platinum-rhodium alloys,
heat-resistant steels, and rarely ceramics. During processing
of a continuous mineral fiber there is an undesirable phe-
nomenon such as spreading of the melt over area of the
spinneret. It is weakly expressed on platinum spinnerets, al-
though with use of spinnerets made of heat-resistant alloys
floating of the head of the spinneret occurs very intensely
and often leads to stopping of the fiber drawing process. This
process occurs during production of staple fiber, but here the
effect on the production characteristics of processing is less.
In this connection it is important to study the mechanism of
wetting with the aim of reducing its negative influence on a
production process for mineral fiber preparation.
Spreading of melt over the spinneret surface may be con-
ditionally separated into several stages (Fig. 1). We consider
the collection of factors that predetermine the occurrence of
individual stages of melt spreading over a spinneret.
In the first stage under the action of gravitational force
the melt passes through an opening of the spinneret and
forms at its lower part a spherical “bulb” that is held in the
spinneret by adhesive forces and surface tension. During the
passage of time the bulb grows and when its weight exceeds
that adhesive force part of the bulb separates from the
spinneret and falls downwards being drawn into a fiber.
Fibers prepared in this way from the whole spinneret are di
rected into the drawing device that provides continuous fiber
drawing. Part of the bulb remains at the tip of the spinneret
and serves as a source of melt for further fiber formation.
Here it is necessary to observe equality of the amount of melt
that enters the bulb from the spinneret opening and that car
Refractories and Industrial Ceramics Vol. 48, No. 1, 2007
1083-4877/07/4801-0053 © 2007 Springer Science+Business Media, Inc.
Ukraine National Technical University – KPI, ZAO Mineral,
Fig. 1. Stages of melt spreading over the spinneret surface: a, spinneret; b, melt; c, “bulb”; d, fiber; 1, bulb formation from which the fiber is
drawn; 2, spreading of melt over the horizontal generating line of the spinneret; 3, flow of the melt from above over the vertical generating line
of the spinneret; 4, spreading of melt over the horizontal surface of the spinneret; 5, total floating of the spinneret and end of the fiber drawing