Bushing temp controller

Abstract

A bushing temperature controller includes a transformer 3 which supplies a main current 11 to the bushing 2 for accommodating molten glass, and regulation current supply units 7 and 8 which are adapted to supply regulation currents I2 and I3 either in phase with the main current I1 or in phase inverted to the main current I1 to a portion of a region to which the transformer 3 applies the current. Thus, the temperature control of partial regions 2a and 2c in the region to which the current is applied can be performed in a wide temperature range.

Description

technical field [0001] The present invention relates to a sleeve temperature control device for controlling the temperature of a sleeve used for spinning glass fibers. Background technique [0002] Generally, glass fibers are spun by forming a plurality of holes in the bottom of a sleeve that accommodates molten glass, letting glass fibers flow out from these holes, and bundling and winding up a plurality of fibers. At this time, in order to obtain uniform glass fibers, the sleeve must be heated to a uniform temperature. This heating is performed by passing an electric current through the bushing. [0003] The conventional temperature control of the bushing is carried out by converting the thermoelectromotive force of the thermocouple arranged in the center of the bushing into temperature, and passing a predetermined current through the bushing to keep the temperature constant. The temperature is kept constant. [0004] However, the current density tends to be higher at b...

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Problems solved by technology

At this time, even if the current supply amount becomes zero, and it is necessary to lower the temperature, it is necessary to adjust the current supply amount of the main first power transformer or adjust the lower part of the sleeve for cooling drawn from a plurality of holes. Cooling fins that melt glass, so temperature adjustment becomes very troublesome

[0011] In the temperature control device described in JP-A-11-327661, since the amount of current shunted by the shunt circuit cannot be adjusted, even fine temperature control will become a cause of instability (hunting), and it is possible Generate Tex changes

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