JPH022978B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing glass fiber strands for reinforcing plastics.

Currently, glass fiber products such as glass roving and glass roving cloth are widely used as reinforcing materials for various plastic products.

Glass roving is a glass fiber product composed of glass fiber bundles made by bundling many long glass fibers almost parallel, so it has a high reinforcing effect in the fiber axis direction of the glass fiber bundles. , almost no reinforcing effect can be expected in other directions. Therefore, glass fiber-reinforced plastic products (hereinafter referred to as
FRP products (FRP products) have the problem that their strength varies widely depending on the direction, with some directions having extremely low strength compared to other directions. To solve this problem, when manufacturing FRP products using forming methods such as the pultrusion method and filament winding method, use glass fiber fabric products such as glass cloth, glass tape, and glass roving cloth in combination with glass roving. Often used.
However, the molding efficiency of FRP products deteriorates,
Due to rising material costs, very recently, fiberglass bundles with looped glass fibers have been introduced.
Glass fiber entwined strings that can be reinforced with looped glass fibers in directions other than the orientation direction of the fiber bundles have begun to attract attention. However, such a glass fiber entwined string in which a looped glass fiber is entangled with a glass fiber bundle has so far only been studied on a trial basis in the FRP product industry. This is because, when manufacturing twine strings, the processing efficiency of entwining looped glass fibers with glass was poor, and furthermore, it was quite difficult to adjust the string to a constant thickness.

As a result of intensive study on processing technology to commercialize the above-mentioned glass fiber twine, the inventors of the present invention found (a) a means for imparting circular motion to the glass fiber bundle constituting the core of the continuously drawn glass fiber twine; ,(b)(b)
means for feeding glass fibers for loop-forming threads of the glass fiber tangle into the circular motion range of the glass fiber bundle composing the core of the glass fiber tangle at a faster rate than the supply rate of the glass fiber bundle composing the core; A means for rolling up the glass fiber entwined string obtained by the methods of (c), (a) and (b), and an adhesive applying means and adhesive drying to strengthen the entangling force as necessary. By installing a means and, if necessary, controlling the excessive bulk of the loop part of the glass fiber tangle to an appropriate level, we can produce high-quality tangles that can improve work efficiency during FRP molding. In order to provide this, it has been discovered that by installing a means for controlling the excessive bulk of the loop after the means (b), it is possible to efficiently produce a glass fiber entwined string with less uneven thickness, and the present invention has been achieved. It has arrived.

FIG. 1 and FIG. 2 schematically show an example of a device for imparting circular motion to the glass fiber bundle constituting the core of the entangled string used in the present invention.

The apparatus shown in FIG. 1 is composed of a pipe part 5 integrated with a cylindrical part 4, and a motor 3 for giving rotation to these parts. The glass fiber bundle 2 constituting the core of the twine is pulled out from the glass fiber bundle winding body 1 into this device, passed through the pipe part 5, and pulled out from the guide hole 6 made in the pipe part 5 near the cylindrical part 4. This glass fiber bundle 2 is passed through a guide hole 7 made in the cylindrical part 4,
Circular motion can be imparted to the glass fiber bundle 2 by rotating the pipe portion 5 and the cylindrical portion 4 by the motor 3 while continuously drawing it out. When manufacturing glass fiber twine using this equipment, the glass fiber bundle that forms the core of the twine must be fed into the pipe section as a single bundle, so in order to improve the manufacturing efficiency of the glass fiber string, It is desirable to use relatively thick glass fiber bundles in the range of 2/5 to 4/5 of the thickness of the glass fiber twine to be manufactured.

The apparatus shown in FIG. 2 is capable of simultaneously supplying a plurality of glass fiber bundles and simultaneously imparting circular motion to the plurality of glass fiber bundles. That is, a plurality of glass fiber bundle rolls 1
A disk stand 8 on which the glass fiber bundle 2 can be installed and a cylindrical section 4 that imparts circular motion to the glass fiber bundle 2 are fixed to one rotating shaft, and by rotating the rotating shaft with the motor 3, the cylindrical section 4 and the disk stand are fixed. 8 is a device that can rotate in conjunction with each other. A plurality of glass fiber bundle winding bodies 1 are placed on a disc stand 8, and the glass fiber bundles 2 that constitute the core of the entwined string are pulled out from the glass fiber bundle winding bodies, and each glass fiber bundle is placed close to the winding body. By rotating the cylindrical part 4 and the disc table 8 by the motor 3 while passing through the guide hole 7 of the cylindrical part 4 drilled in the part, the plurality of glass fiber bundles are twisted and moved in a circular motion. . When manufacturing a glass fiber tangled string using this device, it is possible to simultaneously supply a plurality of glass fiber bundles that constitute the core of the tangled string. It can be made thinner than that used in The magnitude of the circular motion imparted in the example apparatus of FIGS. 1 and 2 is determined by the position of the guide hole 7 in the cylindrical portion 4. The position of the guide hole can be adjusted to the optimum position by considering the thickness of the entangled yarn to be manufactured and the bulkiness of the loop-forming yarn. In other words, if the circular motion is too large, the loop-forming yarn will protrude from the core yarn, and if it is too small, the loop-forming yarn will not wrap around the core yarn well, so it is usually used in a circular motion range with a radius of 10 cm to 100 cm. do.

The glass fiber bundles constituting the core of the twine used in the production method of the present invention include glass strands made by bonding a large number of glass filaments together into a bundle with an adhesive, and glass strand bundles made by bundling a plurality of these glass strands together. There are glass yarns made by twisting glass strands.

FIGS. 3 to 5 show cross-sectional views of examples of devices for supplying glass fiber bundles for loop-forming yarns.

The glass fiber bundle supply device shown in FIG. 3 is a pneumatic suction device that presses air through the air introduction hole 9.
The glass fiber bundle 11 for loop-forming yarn is sucked out by the aspirator effect when the air is swirled and discharged from the air discharge hole 10.

The glass fiber bundle feeding device shown in FIG. 4 is of a type in which a glass fiber bundle 11 for loop-forming yarn is fed by a feed roller 12 that is rotated in a controlled manner. The glass fiber bundle supply device shown in FIG.
This is a combination of the devices of FIGS. 3 and 4.

The glass fiber bundle feeding device equipped with the feed roller 12 shown in FIGS. 4 and 5 has uneven tension when pulling out the glass fiber bundle 11 for loop-forming yarn from the glass fiber bundle winding body. Since it is also possible to draw out at a constant speed, it is more suitable for drawing out a glass fiber bundle for loop-forming yarn than a glass fiber roll with large tension unevenness.

The feeding speed of the glass fiber bundle for loop-forming yarn supplied by the glass fiber bundle supply device shown in FIG. 3 or FIG. 5 depends on the thickness of the glass fiber for loop-forming yarn to be used and the manufacturing Although the composition ratio of the loop-forming yarn of the glass fiber entwined string and the glass fiber bundle constituting the core varies, it is preferable to feed the glass fiber bundle 2 to 30 times faster than the feeding speed of the glass fiber bundle forming the core of the entangled string.

The glass fiber bundle for the loop-forming yarn used in the manufacturing method of the present invention is similar to the glass fiber bundle that constitutes the core of the twine, but it improves the production efficiency of the glass fiber twine. In order to
The thickness of the glass fiber bundle for loop-forming yarn is
It is preferable to make it thinner than that of the glass fiber bundle that constitutes the core of the twine.

In the manufacturing method of the present invention, various types of winding machines which are capable of winding up at a constant speed and which are generally widely used by fiber manufacturers can be used as the winding device for winding up the glass fiber tangled string while taking it. Available for use.

In the manufacturing method of the present invention, in order to strengthen the entangling force of the glass fiber twine, it is possible to use a spray adhesive application method in which the adhesive solution is applied by spraying, or to apply the glass fiber on the rotating roller surface coated with the adhesive solution. Applicator roller type adhesive application method in which the adhesive is applied by running the fiber strands in contact with each other, dipping type adhesive application method in which the glass fiber strands are immersed in the adhesive liquid to apply the adhesive, etc. It is extremely effective to apply a liquid adhesive by any means. When applying a liquid adhesive in this way, depending on the type of adhesive liquid (aqueous adhesive liquid, etc.), drying methods (hot air drying, infrared drying, dielectric heating drying, vacuum drying, etc.) may be used. It will be necessary to dry it before taking it.Also,
A solid adhesive (powder, fiber, etc.) that softens and exhibits adhesive strength when heated can also be used. A method of applying such a heat-softening adhesive to the glass fiber tangle is to continuously drop a predetermined amount of the heat-softening adhesive from the top of the running glass fiber tangle and make it adhere to the tangle. There are methods etc. When a heat-softening adhesive is applied, it may be heated and softened using a heating device such as a dryer or a heated roller, then cooled to such an extent that it does not exhibit adhesive strength, and then rolled up.

In the manufacturing method of the present invention, the device used as a means for controlling the loop-like bulk of the glass fiber entwined string is an enlarged version of the pneumatic suction device shown in FIG. 3 (16 in FIG. 6). However, when passing through a device in which the direction of airflow is set opposite to the running direction of the twine, excessive bulky loops (large loops perpendicular to the core thread) of the glass fiber twine are removed. This is particularly desirable because it allows the cord to be entangled in an appropriate state; however, for glass fiber twine coated with adhesive, excessive bulkiness of the loop portion can be avoided by passing it through a guide or cylindrical object having a predetermined inner diameter. can be controlled.

The present invention will be explained below with reference to Examples.

FIG. 6 shows a manufacturing function diagram of Example 1, and FIG. 8 shows a manufacturing function diagram of Example 2. Further, FIG. 7 schematically shows the glass fiber entwined string obtained in Example 1, and FIG. 9 schematically shows the glass fiber entangled string obtained in Example.

Embodiment 1 In FIG. 6, a glass strand bundle 14 constituting the core of a twining string with a thickness of 1150 tex (the unit of thickness represents the weight in grams per 1000 meters in length) is pulled out from the glass roving winding body 13, It was supplied to the cylindrical part 4 through a guide hole drilled at a position with a circular motion with a radius of 20 cm, and the cylindrical part 4 was rotated at 150 rpm while being withdrawn at a speed of 50 m/min.
On the other hand, one glass fiber roll is thicker than the two glass fiber rolls 1.
Two glass strands 21 for forming loops of 180 tex are pulled out, and a feed roller-type glass fiber bundle supply device 15 is used to apply a circular movement area (rotating cylinder part) of the glass strand bundle constituting the core at a speed of 100 m/min. Feed at speed. After suppressing the excessively bulky loop portion of the glass fiber strand thus obtained with a large pneumatic suction device 16 whose air flow direction is set opposite to the running direction of the strand, the applicator roller Aqueous polyvinyl acetate adhesive was applied using a type adhesive applying device 17, and dried using a hot air dryer 18. Thereafter, tension was applied to the glass fiber entwined string by a tension applying device 19, and the string was wound up by a winding machine 20. The glass fiber twine produced in this way has a thickness that constitutes the core of the twine, as shown in the schematic diagram in Figure 7.
It has a structure in which two glass strands 21 having a thickness of 180 tex form a loop having a length of 1 to 10 cm in a glass strand bundle 14 having a thickness of 1150 tex, and are intertwined so as to wrap around the strand 14. .

Example 2 In FIG. 8, two glass rovings 13
After installing the two glass yarn winding bodies 22 on the disc table 8,
A glass strand bundle 26 of 570 tex is pulled out, passed through a guide hole 7 drilled in the cylindrical part 4 at a position where it moves in a circular motion with a radius of 50 cm, and while being pulled out at a speed of 80 m/min, two glass yarn winding bodies are pulled out. 22
Two glass yarns 27 with a thickness of 87 tex are pulled out from the shaft and supplied to the pneumatic suction device 16 through the guide hole 23 made in the rotating shaft, and the aspirator effect causes the glass yarns 27 to be drawn into the cylindrical part at a speed of 200 m/min. 4, the motor 3 rotates the disc table 8 and the cylindrical portion 4 at a rotational speed of 100 rpm. After applying a water-based polyester adhesive to the thus obtained glass fiber entwined string using a spray adhesive applying device 24, the string is passed through a control guide 25 in order to control excessively bulky loop threads. , is dried by a hot air dryer 18, and is rolled up by a winding machine 20 while applying tension by a tension applying device 19.
I turned it up. As shown in the schematic diagram of FIG. 9, the glass fiber entanglement string produced in this way has two twisted glass strand bundles 26 of 570 tex in thickness, and a glass yarn 27 of 87 tex in thickness. It forms a loop of 1 to 25 cm and has an intertwined structure sandwiched between two strand bundles.

[Brief explanation of drawings]

FIGS. 1 and 2 schematically show an example of a device for imparting circular motion to a glass fiber bundle used in the manufacturing method of the present invention. Figures 3 to 5
The figure is a sectional view showing an example of a device for supplying a glass fiber bundle as a loop-forming yarn used in the manufacturing method of the present invention. Figure 6 shows Example 1
This is a functional diagram showing the manufacturing equipment used.
FIG. 7 is a schematic diagram showing the glass fiber entwined string produced in Example 1. FIG. 8 is a functional diagram showing the manufacturing apparatus used in Example 2. FIG. 9 is a schematic diagram showing the glass fiber entwined string produced in Example 2. Explanation of the symbols: 1...Glass fiber wrap, 2...Glass fiber bundle forming the core of the twine, 3...Motor, 4...Cylindrical part, 5...Pipe part, 6...Drilling in the pipe part 7...Guide hole drilled in the cylindrical part, 8...Disk base, 9...Air introduction hole, 10...Air discharge hole, 11...Glass fiber bundle for loop-forming yarn , 12...Feeding roller, 13...Glass roving, 14...Glass strand bundle constituting the core of the twine, 15...Feeding roller type glass fiber bundle supply device, 16...Large pneumatic suction device, 17 ...Applicator type adhesive applying device, 18...Hot air dryer, 19...
...Tensioning device, 20... Winding machine, 21...
Glass strand for loop-forming yarn, 22
... Glass yarn winding body, 23 ... Guide hole drilled in the rotating shaft, 24 ... Spray type adhesive application device,
25... Control guide, 26... Glass strand bundle, 27... Glass yarn.

Claims (1)

[Scope of Claims] 1 (a) means for imparting circular motion to the glass fiber bundle constituting the core of the glass fiber tangle that is continuously drawn out; (b) constituting the core of the glass fiber tangle in (b) means for feeding the glass fiber bundle for use as a loop-forming thread of the glass fiber twine into the circular motion region of the glass fiber bundle at a faster rate than the supply speed of the glass fiber bundle constituting the core; (c)
1. A method for producing a glass fiber tangle for reinforcing plastics, comprising the steps of rolling up the glass fiber tangle obtained by the methods (a) and (b) while taking it off. 2. A patent claim characterized in that an adhesive applying means and an adhesive drying means are installed between the means (b) and (c) in order to strengthen the entangling force between the glass fibers of the glass fiber entangled string. A method for producing a glass fiber twine for reinforcing plastics according to item 1. 3. Glass for plastic reinforcement according to claim 1, characterized in that a bulk control means is installed after the means (b) in order to control the excessive bulk of the glass fiber twine. Method for manufacturing fiber entangled string.