JPS5954638A - Spinning of hollow glass filament and its device - Google Patents

Abstract

PURPOSE:To prepare easily hollow glass filaments having approximately uniform thickness on the whole circle and high dimensional accuracy, by making melted glass flow continuously and gradually to form a thin melted glass layer, entraining air in it, drawing it. CONSTITUTION:In the spinning device 16, the melted glass 5 put in the melted glass bath 10 is made to flow gradually by its own liquid pressure through the melted glass flow nozzle 11 at the bottom of the melted glass bath 10, received on the tray 12, so that the melted glass 5 is made into the fixed thin melted glass layer 18. The melted glass 5 is drawn from the thin melted glass layer 18 through the spinning nozzle 13, air in the air layer forming layer 14 is entrained in it by suction pressure of the drawing to spin the hollow glass filament 19. Air is forcedly fed from the feed pipe 15 into the air layer forming layer 14, and the pressure is preferably balanced with the liquid pressure in the melted glass bath 10.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a hollow glass fiber spinning method and apparatus.

Glass fiber has a large production volume due to human @ non-mechanical fiber production.
, A; +1 Although the technology for using it has progressed, it has disadvantages such as higher density and lower elastic modulus compared to carbon fiber 3-ite, whose production volume is increasing rapidly in the near future. Hollow glass fibers were developed to overcome this problem and provide new office functions.

Hollow glass fibers may be formed accidentally and locally during spinning of glass fibers, in which case they are treated rather as defective glass fibers.

□IfC for producing hollow glass fibers has conventionally been manufactured by installing a spinning nozzle 2 at the bottom of a molten glass tank 1 as shown in Fig. 1, and inserting the tip of an air introduction tube 3 into the spinning nozzle °2 to inject a molten glass phase 1. Using a spinning device 4 vertically installed inside the
□The molten glass 5 in the molten glass tank 1 is discharged from the spinning nozzle 2, and at the same time, an air introduction tube is inserted into the molten glass 5 to inject air into the molten glass 5, thereby producing □hollow glass fibers 6. was. 1'□By the way, although V'' hollow glass fibers 6 can be easily obtained using the above-mentioned spinning device 4, it is extremely difficult to attach the inlet tube 3 during the high-temperature operation period (1r). If the center of the nozzle 2 is misaligned or it is tilted, the device may be unstable and the molten glass tank 1 o'in (/i: A large number of spinning nozzles 2 may be installed. It is difficult and □.

Pregnant women require constant monitoring for operation and maintenance2, so if
F: Hollow glass that is unsuitable for production and is not suitable for production (6)
That's expensive! : There were also some with poor quality. .

Therefore, the name of the present invention is to develop a spinning device 4K for such hollow glass fibers 6 (((Prior to the development of the spinning device 4K), the spinning device 4K (?+r l*I! glass 5 near the spinning nozzle 2 in the spinning device 4) was developed.
As a result of a detailed investigation of the appropriation behavior of +VIIjK, the following was found.

l) The molten glass 5 at the upper center of the spinning nozzle 2 flows fastest.

2) Flow rate, II, In-ma spinning nozzle 2 rt) r4v
3) the core is packed outwards 4; 3) at a distance corresponding to the nozzle diameter of the upper part of the spinning nozzle 2;
The part where the molten glass 5 is flowing fastest is a position about 1/3 of the nozzle diameter.

Therefore, by injecting air into the flowing part of the molten glass 5, the hollow glass fiber #, IA 6
It was found that □ can be easily created. That is, bath melting glass ≧
:5, if the liquid depth is maintained at about the nozzle diameter, molten glass, 2
It was found that it was easy to make fiber 6 with a VC hollow glass by pulling out 5. The i-liquid depth varies, but is generally t,1: 10 times or less the nozzle diameter.

On the other hand, if the liquid depth of the molten glass 5 is made shallow, ? TkJ:I
3 becomes smaller, the outflow force of the molten glass 5 becomes smaller,
It becomes difficult to continuously spin the hollow glass fibers 6.

The present invention focuses on the above points □) 1. The molten glass is made to flow down continuously and gradually by adjusting the pressure from 15 μm or more to form a thin molten glass layer, and from this thin molten tF glass layer, the bath molten glass is The overall object of the present invention is to provide a method and equipment for spinning hollow glass fibers by drawing out and introducing air.

The method and apparatus for spinning hollow glass 2fR fibers according to the present invention will be explained below with reference to the drawings. First, an example of a spinning apparatus for carrying out the Ab yarn method will be explained with reference to FIGS. A plurality of molten glass flowing down nozzles 11 (four in this example) are provided on the bottom at equal intervals in the front, rear, left and right directions.

A tray 1275 for forming a thin molten glass layer is provided below the molten glass flowing down nozzle 11, and this tray 12 has the same planar area as the molten glass tank 10, and has a plurality of 9 in this example on the bottom surface. The spinning nozzles 3 are provided at equal intervals at diagonal positions around the projected position of the molten glass flowing down nozzle 11. The area around the molten glass flowing down nozzle 11 is molten glass 4! ! 10 and tray 12.
An air layer forming tank 14 is formed by the peripheral wall connecting the two, and an air introduction pipe 15 is communicated with this air layer forming tank 4.

Next, the spinning method of the present invention using the spinning device 16 having a rounded structure will be explained. The molten glass 5 held in the molten glass tank 10 is continuously and gradually converted into molten glass by its own hydraulic pressure from the molten glass flowing down nozzle tzll at the bottom of 1υ]0? Lower it by 1ffl and place it on tray 12.

A certain thin layer of molten glass 1
After that, the molten glass 5 is passed through the spinning nozzle 13f from this thin molten glass layer 18, and the air in the air layer forming tank 14 is drawn in by the suction pressure caused by . A hollow glass fiber 19 is spun.

It is preferable to supply air into the air layer forming tank 14 in a cumulative manner to balance the liquid pressure in the molten glass tank 10.

However, the part that holds the air layer does not have to be a closed space, but may be a space that is open to the atmosphere. By creating a closed air space, the liquid pressure of the molten glass can be directly transmitted to the molten glass flowing out through the nozzle, making spinning easier. but,
As long as a thin molten glass layer that is sufficiently controlled by the liquid pressure of the molten glass can be spun, the air layer may be open to the atmosphere.

Hollow glass fiber spun as described above], 9 ti,
The wall thickness is approximately uniform all around, with almost no misalignment on the inner and outer peripheral surfaces, and the wall thickness is approximately uniform throughout the entire length, with almost no locally thinner areas. It is of good quality with high dimensions at IfF.

Therefore, in order to clarify the effects of the hollow glass fiber spinning method of the present invention, we will introduce a concrete example of the hollow glass fiber spinning method and a conventional 1 fl
l [I will explain about it.

[Implementation+nl 1] Figure 2 3. In the spinning device 16 made of white and gold having the structure shown in [), the dimensions of the molten glass tank 10 are 100 m in length and 1 Fl in width.
omat b chisel plane square, height 150 u, molten glass flow nozzle 11 diameter 4.0, length 7.0 yJ
R,) Ray]2 tDt4i], OTIjI,
Spinning nozzle 13 (D 1 (q diameter 2. l) y.

Length 0.511+J, air layer formation 1v! Using a spinning device 16 with a height of 7.01 + 1 J for I 14 and an inner diameter of 4.0 J for air supply pipe J5, the molten acid 1 (glass 5) made of B type glass was spun into a hollow fiber under the following spinning conditions. I love glass fiber 19!

Spinning conditions Melt M1 [Glass temperature 1260°C Spinning nozzle temperature 1050°C Molten glass liquid depth 40% thin molten glass layer 3, spinning speed 500rrt/night The hollow glass fiber obtained.

Fiber diameter: 4 μm.

Medium/Empty $25 thick
Maximum 5/1 m Minimum 3 μin [Example 2] Using the same spinning device 16 as in Example 1 and using the following sheath threads and conditions, m fused glass 5″f consisting of E, Yu, Eve glass,
A hollow glass fiber 19 was obtained by spinning.

Spinning molten glass temperature 1260℃ Spinning nozzle temperature 105 Q℃ Molten glass liquid depth 40J+J Thin molten glass layer 30.

Spinning speed 800.../i Obtained hollow glass fiber diameter 12 itm Hollowness ratio 30 Thickness Maximum 4 μm, minimum 2 μm [Example 3] In order to change the liquid depth of the thin molten glass layer 18, the molten glass was Only the length of the downstream nozzle 11 was changed to 5.0 Ayu, and other
Using a spinning device 16 with the same dimensions as in Example 1, the molten glass 5 made of E type glass was spun under the following spinning conditions to obtain hollow glass fibers 19. Spinning conditions: Molten glass temperature: 1250°C Spinning Nozzle temperature: 1050°C Molten glass liquid depth: 100 mm Thin molten glass layer 5 Spinning speed: 8 o1'o m7M- Obtained hollow glass fiber 1. ,.

Fiber diameter 13μm Hollow rate 20qb flesh
Thickness: Maximum 4 It m, minimum 3 μm, thickness 71. '□ In the spinning device 4 made of platinum having the structure shown in Fig. 1, the molten glass tank l has a rectangular cross section of 50 mm in length and 50 mm in width, and a height of 100 m, and the diameter of the spinning nozzle 2 is 4. Using a spinning device 4 having a length of 5.0mm, an opening diameter of 2.0pun, and an air introduction tube 3 diameter of 1.0u, molten glass 5 made of E type glass is spun into a hollow fiber under the following spinning conditions. Gala Sakai fiber 6 was obtained.

Spinning conditions Molten glass temperature i, 2c; o℃ Spinning nozzle temperature 1050℃ Spinning speed 500m/resulting hollow glass fiber Fiber diameter 20μ Hollow ratio 13mm Thickness Maximum 9μ, minimum 511m
As described above, the intermediate receiving glass fiber assembly of Examples 1, 2, and 3 has a thinner fiber diameter and a higher hollowness ratio than the conventional hollow glass fiber, and has very little variation and unevenness in wall thickness and is approximately uniform. - thick wall,
It can be seen that the dimensional accuracy is high and the quality is good.

The molten glass flow down nozzle 11 and the tray 12 of the spinning device 16 of the above embodiment are on the same plane as the molten glass (bottom 10), but are placed on the bottom side of the molten glass tank 10 as shown in FIG. A guide part 20 is provided, and a molten glass falling nozzle "1" is provided at the bottom of this guide part 20, and a tray 12 is provided below it.
It is also possible to provide an air layer forming tank 14 around the molten glass flowing down nozzle 11.

As can be seen from the above explanation, according to the hollow glass fiber spinning method of the present invention, the fiber diameter is small, the hollowness ratio is small, the thickness is approximately uniform throughout the circumference and the entire length, and the quality is high with high dimensional accuracy. It has the excellent effect that hollow glass fibers can be easily obtained.

Furthermore, the hollow glass fiber spinning apparatus of the present invention has a simple structure, is easy to manufacture, is inexpensive, and is easy to maintain. Moreover, it has advantages such as easy addition of spinning nozzles, suitable for mass production, and extremely easy operation control.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view showing a conventional hollow glass fiber spinning apparatus, FIG. 3 is a longitudinal cross-sectional view showing another example of the hollow glass fiber spinning apparatus of the present invention. 5,... Molten glass, 10... Molten glass tank, 11
... Molten glass flowing down nozzle, 12... Tray, 13
... Spinning nozzle, 14... Air layer forming tank, 15...
- Air supply pipe, 16... Spinning device, 17... Air layer, 18... Thin molten glass layer, 19... Hollow glass fiber.・Applicant: 83 Naka Kikinzoku Kogyo Co., Ltd. Shimizu
Norio Figure 1 Figure 2 (b) Figure 3

Claims (1)

[Claims] l) Solu+A! 1+Glass to adjust own hydraulic pressure or pressure from outside”:S:,! I! Continuously gradually Ic 1) Ij
Spinning of hollow glass fibers characterized by fading to form a thin molten glass layer, and then drawing out the molten glass from this thin molten glass layer and injecting air to spin hollow glass fibers, i4f,'. Method. 2) A molten glass tank that holds a large amount of molten glass, and several molten glass flows provided at the bottom of this molten glass tank,
A hollow glass fiber spinning device comprising an F nozzle, a tray for forming a thin molten glass layer provided on the F side of the molten glass flowing down nozzle, and a spinning nozzle provided at the bottom of the tray in an 81-number position. .