JPH0925141A - Treatment of glass fiber and treating device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a treatment method for glass fibers which improves the bending fatigue resistance of a belt by spreading a treating liquid sufficiently into glass fiber strands to uniformly impregnate these strands with the treating liquid and removing the unnecessary treating liquid on the surfaces, thereby executing the uniform treatment and an apparatus for production therefor. SOLUTION: The strand 2 formed by doubling the filaments of the glass fibers or the group of the strands 2 formed by collecting plural pieces of these strands are immersed into the treating liquid 6 and, thereafter, the strands are passed through at least one dies 7, by which the treating liquid 6 is squeezed and the strands are impregnated with the liquid. The excess treating liquid 6 on the glass fiber surfaces is removed by at least one pair of felt rollers 8.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and apparatus for treating glass fibers, and more particularly to a method and apparatus for treating glass fibers used as a core wire of a power transmission belt such as a toothed belt.

[0002]

2. Description of the Related Art Conventionally, glass fiber cords have been widely used as reinforcing cords which are cores of rubber belts such as toothed belts, V belts and flat belts. In general, when glass fiber is used as a reinforcing cord, in order to improve adhesiveness with rubber and improve bending fatigue resistance, a glass fiber strand or a group of a plurality of strands of the glass fiber is subjected to RFL treatment. . Further, as the RFL treatment, there is known a means for coating the surface of the twisted glass fiber cord with the RFL liquid (for example, disclosed in JP-A-50-42194).

As a method for coating the glass fiber with the RFL liquid today, as shown in FIG. 5, two sets of felt rollers 25 are arranged in a dip tank 23, and the RFL liquid 24 is placed on the lower felt roller 25. Is soaked into the felt roller 25 and impregnated with the felt roller 25. The RFL liquid adheres to and impregnates the glass fibers while the glass fibers 22 pass between the two sets of felt rollers 25. In this case, the adhesion amount of the RFL liquid was controlled by the rotation ratio of the felt roller 25. Also, R
In order to make the adhesion amount of the FL liquid uniform, the reaction molar ratio of resorcin / formalin is 1/2 to 2/1 and the weight ratio of resorcin / formalin / latex is 1/4 to 1/10.
It is also possible to use the RFL solution described in JP-B-63-9
It is disclosed in Japanese Patent No. 9933.

[0004]

However, in this method, the RFL varies due to variations in the rotation of the felt roller.
The amount of the liquid adhered to the glass fiber varies, and a portion having a small amount of the RFL liquid adhered appears in the glass fiber, so that a portion not partially protected by the RFL liquid may appear. As a result, frictional wear occurs between filaments, which causes a problem that the bending fatigue resistance of the belt deteriorates. Further, even if the molar ratio and the weight ratio of the RFL liquid are adjusted, the conventional method and apparatus could not prevent the occurrence of the variation in the adhered amount.

The present invention solves such a problem, and the treatment liquid is sufficiently spread to the inside of the glass fiber strand, the treatment liquid is uniformly impregnated, and unnecessary treatment liquid on the surface is removed. By performing uniform treatment
It is an object of the present invention to provide a glass fiber processing method and a processing apparatus aiming at improving the bending fatigue resistance of a belt.

[0006]

That is, according to the present invention, a method of impregnating a glass fiber cord with a treatment liquid is to use a strand of glass fiber filaments or a group of strands obtained by collecting a plurality of strands as a treatment liquid. After dipping, the treatment liquid is squeezed and impregnated by penetrating at least one die, and the excess treatment liquid on the surface of the glass fiber is removed by at least one pair of rollers. It is in the processing method. Further, the present invention is a method for treating a glass fiber having a through hole formed by a die having a tapered hole and a linear elongated hole, a method for treating a glass fiber in which a roller is a felt roller, and a treatment liquid is a resorcin / formalin / latex liquid. The method for treating glass fiber is also included.

Further, according to the present invention, a strand of glass fiber filaments or a group of strands obtained by collecting a plurality of the strands is used as a resorcin / formalin / latex liquid (R).
After immersing in the FL liquid), the RFL liquid is squeezed and impregnated by penetrating through at least one die having a through hole consisting of a tapered hole and a linear elongated hole, and the RFL liquid which is the surplus of the glass fiber surface. Is removed with at least one pair of felt rollers.

Further, according to the present invention, a strand in which glass fiber filaments are aligned or a group of strands obtained by collecting a plurality of such filaments is immersed in the treatment liquid, and then the treatment liquid is squeezed to impregnate the treatment liquid with excess treatment liquid. A device for treating glass fibers after removing and drying, and a device for squeezing and impregnating the treatment liquid and removing excess treatment liquid has a through hole consisting of a tapered hole and a straight long hole. It also includes a glass fiber treatment device comprising at least one die and at least one pair of rollers for removing excess RFL liquid on the glass fiber surface.

[0009]

In the present invention, the treatment liquid is squeezed by passing the treatment liquid-impregnated glass fiber strands or groups of strands through the through-holes provided in at least one die, and the treatment liquid is sufficiently filled to the inside. And the treatment liquid can be uniformly impregnated. Further, subsequently, the excess treatment liquid adhered to the surface by the at least one pair of rollers is removed by the at least one pair of rollers, whereby a uniform adhesion state of the treatment liquid can be established. In particular, by providing a through hole provided in the die with a tapered hole, it is possible to gradually squeeze the glass fiber strands impregnated with the treatment liquid, and at the same time, the treatment liquid can be sufficiently spread to the inside. . Further, the cord using the glass fiber obtained by this method has increased flex resistance, and when used in the core wire of the belt, it retains a high level of belt strength even after running, and flex fatigue resistance is further improved. improves.

[0010]

FIG. 1 shows a glass fiber treating method and apparatus according to the present invention. The strands 2 in which the glass fiber filaments wound around the cheese 1 are aligned or a group of strands 2 in which a plurality of the same are collected are run and immersed in a dip tank 5 containing the treatment liquid 3. The strand 2 is in a state where the treatment liquid 6 is attached to the surface thereof, and the inside thereof is not impregnated. The strand 2 having the treatment liquid 6 attached thereto passes through the through hole 10 of the die 7. Strand 2 at this time
The treatment liquid 6 adhered to is squeezed by a die 7, and at the same time, the treatment liquid 6 is sufficiently spread to the inside and uniformly impregnated.

In particular, as shown in FIG. 2, the die 7 has a tapered hole 11 as a through hole 10 and a linear long hole 12 following the tapered hole 11, so that the strand of glass fiber is gradually formed. It can be squeezed, and at the same time, it has an effect of sufficiently impregnating the inside of the processing liquid 6. Also, a plurality of dice 7 can be arranged. The inclination angle α of the tapered hole 11 is 15 ° to 45 °. If the taper inclination angle is less than 15 °, the glass fiber strands 2 are suddenly squeezed, so that the treatment liquid is not sufficiently impregnated, and the flexibility of the toothed belt using such a cord decreases. On the other hand, the same thing occurs when the inclination angle exceeds 45 °. Also long hole 1
The diameter of 2 is 0.2-2 mm, for example ECG-150
It is necessary to properly use the strand 2 of No. 2 and the strand 2 of ECG-75.

Subsequently, the glass fiber strands 2 are passed through at least one pair of rollers 8 and the excess treatment liquid 6 on the surface is wiped off. The roller 8 used here is shown in FIG.
As shown in FIG. 3, the iron core 13 is surrounded by a felt 14 made of a non-woven fabric. The glass fiber strands 2 pass while being sandwiched between the two felt rollers. The roll pressure at the time of pinching the strand 2 at this time is 0.1 to 10 kgf / cm. The roller 8
Is not limited to the felt roller, and a cloth or a foam may be attached around the iron core 13.
After that, the glass fiber strands 2 are baked in an oven 9 at 200 to 300 ° C. for 0.5 to 5 minutes, and sent to a lower twisting step.

Glass fiber strand 2 to be treated here
Is used for the core wire of the toothed belt, and is made of E glass or high-strength glass, for example ECG-1
Strand consisting of 50 (15000 made of long-fiber alkali-free glass filament having a diameter of 9 μm nominally)
Yard / pound strand). Combine 2 to 5 strands that have been subjected to adhesion processing, and twist this with 10 to 20
It is finished as a cord twisted at a time of 10 cm. Of course, the glass fiber cord is, for example, ECG150-3 / 13, 3
/ 11, 3/3, 3/2, 3/0 can be finished. In addition to ECG-150 filaments defined in JIS R3413, glass fiber filaments are EC
G-75 is also used.

The processing liquid 6 used here may be an RFL liquid, an epoxy liquid or the like, but in the case of the present invention, the RFL liquid is preferable. The RFL solution is a mixture of an initial condensate of resorcinol and formalin with a latex. In this case, the initial condensate of resorcinol and formalin has a resin content of 2 to 30 relative to 100 parts by weight of the rubber content of the latex. The mixture is mixed with the latex so as to be part by weight, and the total solid concentration is adjusted to 5 to 40%. The latex used here is a styrene / butadiene / vinyl pyridine terpolymer, chlorosulfonated polyethylene, hydrogenated N
The latex is BR, epichlorohydrin, natural rubber, SBR, chloroprene rubber, olefin-vinyl ester copolymer or the like.

[0015]

EXAMPLES Examples of the present invention will be further described below. The strand 2 of glass fiber to be used is a strand made of ECG-150 (15,000 yards / consisting of a long-fiber alkali-free glass filament having a diameter of 9 μm nominally).
A group of 3 strands of 3 pounds of strands) was used. 50 m / min. While being run, the sample was immersed in a dip tank containing the RFL solution shown in Table 1 and passed through the through hole of one die shown in FIG. 3 to squeeze the processing solution. Further, this strand group was passed through a set of felt rollers to which roll pressure was applied by the upper felt roller to remove excess RFL liquid on the surface. This strand group was heat-treated at 250 ° C. for 1 to 2 minutes, and then twisted 16 times per 10 cm, and ECG150-
A glass fiber cord having a 3/0 configuration was produced.

[0016]

[Table 1]

A toothed belt shown in FIG. 4 was manufactured by using the glass fiber cord having the above ECG 150-3 / 0 structure and the core wire 20. This belt uses nylon canvas as the lower cover cloth 17 and chloroprene as the rubber 19,
The pitch of the tooth portions 18 was 2.032 mm, the number of teeth was 150, the belt width was 6.4 mm, and the tooth profile was MXL type. The belt was vulcanized at 160 ° C. for 30 minutes.

Next, a durability test was conducted. In the durability running test, the toothed belt was attached to a running tester consisting of a drive pulley (the number of teeth was 18) and a driven pulley (the number of teeth was 90), the drive pulley was 9000 rpm, the load was 66.2 W, and the initial tension was 9.
A belt tensile strength after running for 8 hours and running for 500 hours was obtained. In addition, as a comparative example, a strand made of ECG-150 was treated by the conventional method shown in FIG.
A glass fiber cord having a structure of G150-3 / 0 was obtained. Using this, a toothed belt of the same type as that of the example was manufactured.

As a result, the tensile strength after running was 824 N / compared with the comparative example of 720 N / 6.4 mm.
The value was 6.4 mm, and the retention rate of the tensile strength after running was 80% in the example compared with 70% in the comparative example.

From these results, the belt using the glass fiber cord obtained by the glass fiber cord treatment method of the present invention as a core wire has a high level of strength as a result of the durability running test. I understand.

[0021]

As described above, the belt using the glass fiber cord obtained by the treatment according to the present invention as the core wire, the treatment liquid is sufficiently and uniformly impregnated to the center of the core wire. It has the advantages of high tensile strength retention after running and good flex fatigue resistance.

[Brief description of drawings]

FIG. 1 is a schematic view of a glass fiber processing apparatus according to the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a sectional view taken along line BB of FIG.

FIG. 4 is a side view of a toothed belt in which a glass fiber cord obtained by the method of the present invention is used as a core wire.

FIG. 5 is a schematic view of a conventional glass fiber processing apparatus.

[Explanation of symbols]

 1 Cheese 2 Strand 3 Guide Roller 4 Dip Roller 5 Dip Tank 6 Treatment Liquid 7 Die 8 Felt Roller 9 Oven 10 Through Hole 11 Tapered Hole 12 Long Hole 14 Felt

Claims (6)

[Claims] 1. A strand in which filaments of glass fibers are aligned or a group of strands obtained by collecting a plurality of such strands is immersed in a treatment liquid, and then penetrated through at least one die to squeeze and impregnate the treatment liquid, and A method for treating glass fibers, characterized in that the excess treatment liquid on the surface of the glass fibers is removed by at least one pair of rollers. 2. The method for treating glass fiber according to claim 1, wherein the die has a through hole consisting of a tapered hole and a linear elongated hole. 3. The method for treating glass fiber according to claim 1, wherein the roller is a felt roller. 4. The method for treating glass fiber according to claim 1, 2 or 3, wherein the treatment liquid is a resorcin / formalin / latex liquid. 5. A strand formed by aligning glass fiber filaments or a group of strands obtained by collecting a plurality of strands is dipped in a resorcin-formalin-latex liquid (RFL liquid), and is then formed with a tapered hole and a linear long hole. A glass fiber characterized by being squeezed and impregnated with RFL liquid by penetrating at least one die having a through hole, and removing excess RFL liquid on the surface of the glass fiber with at least one pair of felt rollers. Processing method. 6. After dipping a strand in which glass fiber filaments are aligned or a group of strands in which a plurality of strands are collected into a treatment liquid, squeezing the treatment liquid to impregnate it, and removing excess treatment liquid. A device for processing glass fibers which is dried and wound up, wherein the device for squeezing and impregnating the processing solution and removing the excess processing solution has at least one through hole consisting of a tapered hole and a straight long hole. An apparatus for treating glass fiber, comprising one die and at least one pair of rollers for removing excess RFL liquid on the surface of the glass fiber.