JPH06136623A - Production of glass yarn - Google Patents

Abstract

PURPOSE:To obtain glass yarns free from such problems that fluffs are developed in glass strands and/or the twisted state of glass yarns is changed by cake drying. CONSTITUTION:Simultaneously with revolving a spindle 12, a spray 20 fitted on a stationary rail 19 is moved at a rate of 10m/min over the whole length of the rail 19 while being temporarily stopped at nearly intermediate positions between respective cakes 15. Besides, when the spray 20 is stopped, the cakes 15 are sprayed with water at about 10cc/hr from respective nozzles 20a to humidify the respective cakes 15.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a glass yarn used as a reinforcing material for various products such as printed wiring boards.

[0002]

2. Description of the Related Art Generally, glass yarn is manufactured through a spinning process and a twisting process.

In the spinning process, molten glass melted in a melting furnace is drawn out from a large number of bushing nozzles to form glass filaments, a sizing agent is applied to the surface of the glass filaments, and then the glass filaments are bundled to form glass strands. This refers to the process of winding a tube made of paper, plastic, or the like into a cake.

The twisting process refers to a process in which a cake is mounted on a creel of a twisting machine, a glass strand is drawn from the cake, and twisted to form a glass yarn.

Usually, a single twisting machine is equipped with a plurality of rotatable spindles in an upright manner in a row,
A bobbin is detachably fitted on each spindle. As many creels as the number of spindles for mounting cakes are provided above each spindle, and between the spindles and creels, a tension bar that gives tension to the glass strands that are pulled out from the cake and the deflection of the glass strands are controlled. A guide member for doing this is attached. A ring rail engaged with a traveler is installed around the spindle. When the yarn twisting machine is operated to rotate the spindle at a constant speed, the ring rail moves up and down at a constant speed. The bobbin having a predetermined shape can be obtained by repeatedly moving and changing the winding position of the glass yarn around the bobbin.

By the way, usually, the cake produced through the spinning process is stored until it is subjected to the twisting process, but it is necessary to prevent the cake from drying during this storage as much as possible.

That is, the fact that the cake is in a dry state means that the sizing agent applied to the surface of the glass filament in the spinning step is solidified. However, when the sizing agent is solidified, the cake is removed from the glass in the twisting step. When pulling out the strand, it becomes easy to generate fluff by joining with the glass strand located in the lower layer, or the binding force of the sizing agent is lost due to friction between the glass strand and the guide member to generate fluff, which is obtained. The twisted state of the glass yarn is likely to change.

[0008] Therefore, the cake conventionally produced through the spinning step is put in a room kept at high humidity until it is subjected to the twisting step, or put in a container sealed for each cake,
This is done to prevent drying during storage.

[0009]

However, the use of a high-humidity room or the use of a large number of closed containers leads to an increase in equipment costs and labor costs. It takes a certain amount of time to load the product into the creel of the yarn twisting machine, and the twisting process is usually 1
Since it takes a time of 0 to 24 hours, the cake is easily dried during this period, and it is impossible to completely prevent the cake from being dried.

An object of the present invention is to provide a method for producing a glass yarn, which is capable of solving the problems that fluff occurs in the glass strands in the twisting process and the twisted state of the glass yarn changes due to the cake being dried. Is to provide.

[0011]

The method for producing a glass yarn according to the present invention is to draw a glass strand while spraying water on a cake mounted on a creel of a twisting machine, and wind the strand around a bobbin while twisting it. Characterize.

[0012]

According to the method of the present invention, even if the surface of the cake in a full state mounted on the creel of the twisting machine is dry, it is humidified by spraying water on it. This water spraying continues while pulling the glass strands out of the cake, so the surface of the cake is always humidified, which makes it difficult for the glass strands to fluff during the twisting process, and the twisted state of the glass yarn. Also becomes difficult to change.

Generally, when the water content of the cake becomes too large, the glass strands are not fully dried in the twisting process and are wound on the bobbin. When the glass yarn obtained from such a bobbin is used, fluff is likely to be generated at the time of unwinding or contact with a guide or the like.

Therefore, in the present invention, it is necessary to strictly control the amount of water sprayed, specifically, the water content of the glass strands drawn from the cake is 5 to 10% by weight.
It is preferable that

In the present invention, in order to spray water on the surface of the cake, the sprayer may be installed so as to be located above the creel of the twisting machine. To spray a proper amount of water on the cake, the sprayer is required. Therefore, the cake may be intermittently sprayed with water, or a plurality of cakes may be moved upward while spraying water continuously or intermittently from one sprayer.

[0016]

EXAMPLES The method for producing glass yarns of the present invention will be described in detail below with reference to examples.

FIG. 1 is a schematic front view of a twisting machine used to carry out the present invention.

In the figure, 10 is a twisting machine, 11 is a drive belt,
12 is a spindle, 13 is a bobbin, 14 is a creel, 1
5 is a cake, 16 is a tension bar, 17 is a guide member, 18 is a ring rail, 19 is a fixed rail, 20 is a sprayer, 20a is a nozzle, and G is a glass strand.

A plurality of spindles 12 which can be rotated by a drive belt 11 are installed upright in a row below the twisting machine 10, and a bobbin 13 is detachably fitted to each spindle 12. ing. The same number of rotatable creels 14 as the spindles 12 are mounted above each spindle 12. A cake 15 is attached to each creel 14, and a glass strand G fed from each cake 15 is passed through each guide member 17 via a tension bar 16 and then a ring rail 18 installed around the spindle 12. It is adapted to be wound on the bobbin 13 while being twisted into a glass yarn by a traveler (not shown) engaged with the.

Above the creel 14 row of the twisting machine 10,
A fixed rail 19 is attached, and the fixed rail 19 is attached with a sprayer 20 which can be moved at a constant speed by a motor (not shown) over its entire length. The sprayer 20 has a plurality of nozzles 20a, water is supplied through a pipe (not shown), and sprayed from each nozzle 20a.

An example of a method for producing a glass yarn using the twisting machine 10 will be described below.

First, a plurality of cakes 15 which have been prepared through a spinning process and then stored for a certain period of time and which have been slightly dried are prepared, mounted on each creel 14 of the twisting machine 10, and then the glass strand G is drawn out. One end was wound around an empty bobbin 13 via a tension bar 16, a guide member 17 and a traveler (not shown).

Then, the drive belt 11 is driven to rotate the spindle 12 at a speed of 4000 to 5000 rpm, thereby rotating the bobbin 13 and the cake 15.
The glass strand G pulled out from the glass was twisted to form a glass yarn and wound on a bobbin 13.

At the same time as the spindle 12 is rotated, the sprayer 20 attached to the fixed rail 19 is temporarily stopped at a position approximately in the middle of each cake 15, while the total length of the fixed rail 19 is set at a speed of 10 m / min. When the sprayer 20 is stopped, the nozzles 2
Each cake 15 was moistened by spraying the cake 15 with 0 to about 10 cc / hour of water.

In this way, the production of glass yarn is
Over time, the amount of fluff generated in the glass strand G pulled out from each cake 15 was 1/2 or less of the amount of fluff generated in the conventional product.

[0026]

As described above, when the glass yarn is produced by the method of the present invention, it is possible to constantly moisten the cake in the twisting step, the glass strands are less likely to be fluffed, and the twisted state is constant. It is possible to obtain glass yarns.

[Brief description of drawings]

1 is a schematic front view of a twisting machine for carrying out the present invention.

[Explanation of symbols]

 10 Twisting machine 12 Spindle 13 Bobbin 14 Creel 15 Cake 19 Fixed rail 20 Sprayer G Glass strand

Claims (1)

[Claims] 1. A method for producing a glass yarn, which comprises drawing a glass strand while spraying water on a cake mounted on a creel of a twisting machine, twisting the glass strand, and winding the strand around a bobbin.