JPH09124802A - Method for manufacturing tensile body for belt - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a tension member useful for various belts by pulling and properly arranging plural glass fibers, immersing them in a specific adhesive solution, subjecting the glass fibers to a heat treatment and applying twist in one direction to widely improve water-proof bending running performance of a belt without losing adhesiveness of the fibers even in the presence of water. SOLUTION: Plural glass fibers 6 are pulled and properly arranged, immersed in a bonding treatment solution mainly containing a mixture of an initial condensate of resorcinol and formalin with a latex, pulled up from the solution and subjected to a heat treatment. Subsequently, the glass fibers are twisted in one direction. Further, it is preferable that plural bundles of glass fibers are collected and primary twist is applied on them to prepare a primary twist yarn 8, and e.g. a styrene-butadiene-vinylpyridine three dimensional copolymer is used as the latex.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a belt tension member used for various belts such as a toothed belt, a V-belt, a flat belt and a speed belt.

[0002]

2. Description of the Related Art Transmission belts such as toothed belts are widely reinforced by using glass cords as tensile members in order to improve toughness or dimensional stability. For example, in the case of a transmission belt used for driving an OHC (overhead cam) of an automobile, it is usually ECG150-3.
/ 13 (Glass fiber bundles with a fiber diameter of 9 μm and 200 fibers are collected and twisted under to form a child lasso.
A cord obtained by gathering three strands and twisting them is adopted as a tensile member, and therefore, it has a twist and a twist.

As such glass cords, those treated with resorcin / formalin / rubber latex (hereinafter abbreviated as RFL) in order to improve the adhesion to the rubber of the belt body are generally used (for example, Japanese Patent Publication No. 3-422
90, JP-A-4-59640, and JP-A-4-59640.
50144). The RFL process is performed on the glass fiber bundle. That is, the glass fiber bundle is dipped in the RFL solution, pulled up, heated and dried, and then the above-mentioned twisting and twisting are performed.

[0004] Recently, as the temperature around the engine of an automobile rises, hydrogenated nitrile rubber, which is more excellent in heat resistance than conventional chloroprene rubber, has been used as a rubber for automobile belts. The hydrogenated nitrile rubber has a lower adhesion to the tensile body than other rubbers. Therefore, there is also a proposal of further applying rubber glue to the above-mentioned twisted yarn (see JP-A-2-4715 and JP-A-3-170534).

[0005]

However, the belt using the above-mentioned glass cord as a tensile body can obtain expected effects due to the toughness and dimensional stability of the tensile body in normal use, When used under high temperature and high humidity, such as in rainy weather, the tensile body deteriorates early and the strength of the belt significantly decreases, and also the bending fatigue resistance of the belt decreases, and it is easy to cause the belt to break. There is. That is, an object of the present invention is to improve the water resistance of the tensile member for a belt made of glass fiber, and thus the water resistance of the belt.

[0006]

The inventor of the present invention began to investigate the cause of the above-mentioned problems from an early stage, and this caused a decrease in the adhesion between the ply-twisted yarns (3/0 fiber bundles) due to the entry of water into the tensile body. It was clarified that it was the cause.

That is, the glass fibers of the glass fiber bundle are adhered to each other by the above-mentioned RFL, and the glass fiber bundles forming the undertwist are also closely adhered to each other via the RFL on the surface of each other. However, if several lower twisted yarns are lined up and twisted, the lower twisted yarns do not completely adhere to each other because the surface of each lower twisted yarn has minute unevenness, and Is RFL
Since they are only bonded by adhesion of, the bonding force is weak. Therefore, if water enters the tension body,
This water content reduces the adhesion between the ply-twisted yarns, and the ply-twisted yarns having a large degree of freedom are displaced to cause damage to each other. Hereinafter, means for solving the above problems will be specifically described.

In the invention according to claim 1, a plurality of glass fibers are aligned and immersed in an adhesive treatment liquid containing a mixture of a resorcin-formalin initial condensation product and a latex as a main component, and the glass fibers are pulled up and subjected to heat treatment. This is a method for manufacturing a tension member for a belt, characterized in that twisting in one direction is added later.

According to the second aspect of the present invention, a plurality of glass fiber bundles are collected and pretwisted to make a pretwisted yarn, and a plurality of the pretwisted yarns are aligned to form an initial condensate of resorcin-formalin and a latex. After immersing the mixture in the adhesive treatment liquid with the main component, pulling it up and subjecting it to heat treatment,
A method for producing a tensile member for a belt, which comprises adding an upper twist in a direction opposite to the lower twist.

In a third aspect of the present invention, a plurality of glass fiber bundles are aligned in a strip shape with no gaps and a flat cross section, and a mixture of an initial condensate of resorcin / formalin and a rubber latex is contained as a main component. It is a method for producing a tensile member for a belt, which is characterized in that a belt-like material is formed by immersing in a bonding treatment liquid, pulling it up, and subjecting it to heat treatment, and twisting in one direction is added to this.

According to a fourth aspect of the present invention, a plurality of glass fiber bundles are collected and pretwisted to prepare a pretwisted yarn, and the plurality of pretwisted yarns are aligned in a strip shape with no gap and a flat cross section. To form a band by immersing it in an adhesive treatment liquid containing a mixture of resorcinol / formalin initial condensation product and rubber latex as the main component, pulling it up, and subjecting it to heat treatment. A method for manufacturing a tension member for a belt, which is characterized in that the belt tension member is added.

According to a fifth aspect of the present invention, there is provided the belt tension member according to any one of the first to fourth aspects.
Further, it is a method for producing a tensile member for a belt, which is characterized in that it is dipped in a rubber paste solution, pulled up and subjected to heat treatment.

The glass fiber used in each of the above inventions is not particularly limited, and generally called non-alkali glass fiber can be used.

The RFL (resorcin.
An adhesive containing a mixture of a formalin initial condensate and a latex as a main component), and the latex is not particularly limited, but styrene-butadiene-
Latex of vinyl pyridine terpolymer, chlorosulphonated polyethylene, nitrile rubber, hydrogenated nitrile rubber, epichlorohydrin, SBR, chloroprene rubber, chlorinated butadiene, olefin-vinyl ester copolymer, natural rubber, etc. or a mixture thereof. Is mentioned.

In the invention according to claim 5, the rubber material for forming the rubber film on the surface of the belt tensile member is not particularly limited, but in consideration of adhesiveness with the belt body rubber, chlorinated rubber , Halogen-containing substances such as polyvinyl chloride, chloroprene rubber, and chlorosulfonated polyethylene are preferable. Further, the solvent for the rubber paste is not particularly limited, but usually, aromatic hydrocarbons such as benzene, toluene, xylene, ethers, halogenated aliphatic hydrocarbons such as trichloroethylene are suitable. Used.

(Operation) In the invention according to claim 1,
Since a plurality of glass fibers are aligned and subjected to RFL treatment and then twisted in one direction, there is no problem of adhesion failure between undertwisted yarns, and each glass fiber is RFL-free. A tight belt tension member is obtained, and when this is used as a transmission belt tension member, the water bending fatigue resistance, which has hitherto been a weak point of glass cords, is improved.

Further, in the invention according to claim 2, since the plurality of ply-twisted yarns are aligned and subjected to the RFL treatment, the ply-twisted yarns in the direction opposite to the ply-twisted yarns are added, so that the ply-twisted yarns are A belt tensile member tightly adhered via RFL is obtained, and the tensile member has low rigidity. When this tensile member is used as a transmission belt tensile member, the water between the lower twisted yarns is reduced. Intrusion is prevented, water resistance is increased, and bending fatigue resistance is increased.

In the invention according to claim 3, a plurality of glass fiber bundles are aligned in a strip shape so as to have a flat cross section with no gaps, and then the same RFL treatment and twisting as in the invention according to claim 1 are performed. As a result, the RFL liquid can be easily spread all over the strip, and the effect of the heat treatment can be uniformly exerted on the entire strip.

That is, when a plurality of glass fiber bundles are aligned so as to have a circular cross-section, the RFL liquid easily impregnates the surface layer portion of the circular cross-section bundle, but the RFL liquid has a distance to penetrate to the core portion. Therefore, uniform impregnation becomes difficult. On the other hand, in the case of this method, since a plurality of glass fiber bundles are aligned so as to have a flat cross section, R
The permeation distance required for completely impregnating the FL liquid from the surface to the inside is shortened, and uniform impregnation can be performed throughout. Further, when a plurality of glass fiber bundles are aligned in a circular cross section, it takes time for the effect of heating after the impregnation to reach the core, and heating is likely to be uneven between the surface layer and the core. However, in the case where the sections are aligned flat, the effect of heating quickly reaches from the surface to the inside, and the RFL can be uniformly heated and reacted from the surface to the inside.

In the invention according to claim 4, a plurality of ply-twisted yarns are aligned so as to have a flat cross section, and the RFL treatment and the heat treatment are performed, as in the invention according to claim 3, Similar to the invention according to 3, the RFL liquid can be surely spread over the whole and uniform heating can be performed.

[0021] In the invention according to claim 5, the rubber coating which is advantageous for enhancing the adhesion stability with the rubber of the belt body can be formed on the surface of the tensile body by the dipping treatment in the rubber paste solution and the heat treatment. .

[0022]

BEST MODE FOR CARRYING OUT THE INVENTION

Example 1 A belt 1 is shown in FIG. The belt 1 is a toothed belt (transmission belt), and includes a tensile body 2 provided in the circumferential direction of the belt, a back rubber 3 provided on one side (rear side) of the tensile body 2, and a back rubber 3. A tooth rubber 4 is provided on the side opposite to the rubber 3 at a predetermined pitch in the circumferential direction of the belt, and the tooth rubber 4 side is covered with a tooth cloth 5.

The tensile body 2 is shown in FIG. The tensile body 2 was manufactured as follows.

That is, 200 alkali-free glass fibers (E glass having a diameter of 9 μm) 6 were bundled to form a glass fiber bundle. Then, 33 glass fiber bundles are aligned and immersed in a Vp-SBR RFL solution having a concentration of 20% by weight,
It pulled up and heat-processed at 240 degreeC for 1 minute. Then, a glass cord (tensile body 2) was obtained by adding a twist of 2.0 twists / inch to this. V above
The p-SBR type RFL uses a terpolymer of vinylpyridine-styrene-butadiene as a latex.

The back rubber 3 and the tooth rubber 4 are formed of a rubber composition containing hydrogenated nitrile rubber as a main raw material. In addition, the above-mentioned tooth cloth 5 is made of yarn 6 extending in the belt width direction,
A 6-nylon thread is used, and an industrial 6,6-nylon woolly processed thread is used as the thread extending in the belt longitudinal direction.

The toothed belt 1 is formed by a conventional press-fitting method using the above materials, and the tooth pitch is 8 mm.
It is a TS tooth type having 113 teeth and a belt width of 19 mm.

<Embodiment 2> As shown in FIG. 3, the tensile member 7 of the present embodiment is the reverse of the under-twist by aligning 11 pieces of the RFL-treated strands (under-twisted yarns) 8 respectively. It is twisted in the direction, and was manufactured by the following method.

That is, three fiber bundles obtained by bundling 200 alkali-free glass fibers (similar to those in Example 1) 6 are aligned, and a twist of 2.0 times / inch is carried out. By adding, the above lasso 8 was formed. Then, 11 of these strands 8 were aligned and immersed in the same RFL solution as in Example 1, pulled up and heat-treated at 240 ° C. for 1 minute, and then twisted in the direction opposite to the initial twist 2. A glass cord (tensile body 7) was obtained by performing twisting at 0 times / inch. Then, using this glass cord, a toothed belt 1 similar to that in Example 1 was prepared.

<Example 3> The twisted glass cord of Example 1 was dipped in a 20% by weight solution of a rubber paste containing chlorosulfonated polyethylene as a main component and pulled up to 150
By drying for 1 minute in an atmosphere of ° C, a rubber film 9 was formed on the surface of the glass cord as shown in Fig. 4. Then, this was used as a belt tension member 10 to prepare a toothed belt 1 similar to that in Example 1.

<Example 4> The glass cord after the overtwisting of Example 2 was subjected to the same rubber paste treatment as in Example 3 to form a rubber film on the surface of the glass cord, which was used as a tensile member for a belt. A toothed belt similar to that in Example 1 was prepared.

<Example 5> 200 alkali-free glass fibers (similar to Example 1) 6 were bundled to form a glass fiber bundle. Then, 33 of these glass fiber bundles are shown in FIG.
As shown in Fig. 1, the belt-shaped material 1 is aligned so as to have a flat cross-section and does not form a gap between the fiber bundles.
1 was immersed in a Vp-SBR RFL solution having a concentration of 20% by weight, pulled up, and heat-treated at 240 ° C. for 1 minute.
After that, the glass cord (tensile body) 1 shown in FIG. 6 is obtained by adding a twist of 2.0 times / inch to this.
2 was obtained. Then, using this glass cord 12, a toothed belt similar to that in Example 1 was prepared.

<Example 6> Three fiber bundles obtained by bundling 200 alkali-free glass fibers (similar to Example 1) 6 are aligned and twisted at a twist frequency of 2.0 times / inch. By adding a lower twist, the same lasso 8 as in Example 2
It was created. Next, as shown in FIG. 7, eleven of the strands 8 were aligned in a strip shape so that the cross-sectional shape was flat and no gap was formed between the strands, and this strip 13 was formed in Example 2. Similarly, by immersing it in a Vp-SBR RFL solution, pulling it up, heat-treating it at 240 ° C. for 1 minute, and then twisting it in a direction opposite to the lower twisting with a twisting number of 2.0 times / inch. Glass cord (tensile body) 14 shown in 8
I got Then, using this glass cord, a toothed belt 1 similar to that in Example 1 was prepared.

<Example 7> The twisted glass cord of Example 5 was subjected to the same rubber sizing treatment as in Example 3 to form a rubber film on the surface thereof. Then, using this as a belt tension member, a toothed belt 1 similar to that in Example 1 was prepared.

Example 8 The glass cord after the twisted yarn of Example 6 was subjected to the same rubber paste treatment as in Example 3 to form a rubber film on the surface thereof. Then, using this as a belt tension member, a toothed belt similar to that of Example 1 was prepared.

<Comparative Example 1> Three fiber bundles each containing 200 alkali-free glass fibers (E glass) having a diameter of 9 μm are aligned and dipped in the same RFL solution as in Example 1,
Number of twists 2.0 after heat treatment at 240 ° C for 1 minute
Twisted / inch and twisted into a lasso. This child rope 1
Collect one strand and twist it in the opposite direction to the above-mentioned twist, 2.0 times / in
A glass cord was created by twisting it on the ch. Then, using this as a belt tension member, a toothed belt similar to that of Example 1 was prepared.

<Comparative Example 2> A rubber coating is formed on the surface of the glass cord after the upper twist of Comparative Example 1 in the same manner as in Example 3, and this is used as a belt tension member, and the same tooth as in Example 1 is used. The attached belt 1 was created.

(Water Injection Bending Fatigue Test) A bending fatigue test was performed on each of the belts of the above Examples and Comparative Examples. That is, the toothed belt A is wound around four large pulleys 31 constituting the belt bending tester shown in FIG. 9 and four small pulleys 32 (diameter 30 mm) arranged between the adjacent large pulleys 31, 40 kg on the toothed belt A with weight 33
With the tension of f applied, water 34 is dripped at the tooth bottom of the toothed belt A at a rate of 1 liter per hour.
The belt was run at 500 rpm until cutting, and the number of times the belt was bent before cutting was examined. The test results are shown in Table 1.

[0038]

[Table 1]

According to the same table, the toothed belts of Examples 1 to 8 have a significantly greater number of bendings until cutting than Comparative Examples 1 and 2. From this, it is understood that the present invention is effective in dramatically improving the water resistance of the belt.

Example 1 and Example 2 are in a relationship that only the presence or absence of undertwisting is different, the relationship between Example 3 and Example 4, the relationship between Example 5 and Example 6, and the implementation. The same applies to the relationship between Example 7 and Example 8. Comparing each of these, the number of times of bending until cutting is greater in the case of the under-twisted one. From this, it is understood that the bending resistance of the belt is further improved by subjecting the glass fiber before the RFL treatment to the twisting and then performing the treatment.

Further, Example 1 and Example 3 are in the relationship that only the presence or absence of the rubber coating is different. The relationship between Example 2 and Example 4, the relationship between Example 5 and Example 7, and the example. The relationship between No. 6 and Example 83 is also the same. Comparing each of these, the one having a rubber coating has a greater number of flexing times before cutting. It is considered that this is because the rubber film stabilizes the adhesive force between the tensile body and the belt main body rubber (back rubber and tooth rubber), and the water resistance of the belt is improved.

Next, the relationship between Example 1 and Example 5, the relationship between Example 2 and Example 6, the relationship between Example 3 and Example 7, and the relationship between Example 4 and Example 8. Differs only in that the cross-sectional shape of glass fibers or ply-twisted yarns when they are aligned for RFL treatment is circular or flat (belt-shaped). Comparing each of these, the number of times of bending until cutting is larger when the cross section is flat. It can be understood that this is because the RFL liquid is well impregnated and uniform heating is achieved by aligning the strips in a strip shape.

[0043]

According to the invention of claim 1, after a plurality of glass fibers are aligned and subjected to RFL treatment,
Since the unidirectional twist is applied, it is possible to obtain a belt tension member in which glass fibers are strongly bonded to each other by RFL, and the adhesion of the fibers is not impaired even in the presence of water. The water resistance bending running performance can be dramatically improved.

According to the second aspect of the present invention, after the plurality of ply-twisted yarns are aligned and subjected to the RFL treatment, the ply-twisted yarn in the direction opposite to the ply-twisted yarn is applied. It is possible to obtain a low-strength tensile member for a belt that is tightly adhered via RFL, and can improve water resistance and flex fatigue resistance of the belt.

According to the invention of claim 3, a plurality of glass fiber bundles are aligned in a strip shape so as to have a flat cross section with no gaps, and then the same RFL as that of the invention of claim 1 is provided.
Since the treatment and the twisting are performed, the impregnation of the RFL liquid can be ensured and the heating can be made uniform, and the tensile strength of the belt and the belt can be improved and the flex fatigue resistance can be improved. It is advantageous for improvement.

According to the invention of claim 4, since a plurality of ply-twisted yarns are aligned so as to have a flat cross section as in the invention of claim 3, the RFL treatment and the heat treatment are carried out. Similarly to the invention according to claim 3, the RFL liquid can be surely spread over the whole and uniform heating can be performed, which is advantageous for improving the water resistance and bending fatigue resistance of the belt tensile member and the belt. Become.

According to the fifth aspect of the invention, the belt tensile member having a rubber film which is advantageous for enhancing the adhesion stability with the rubber of the belt main body is obtained by the dipping treatment in the rubber paste solution and the heat treatment. be able to.

[Brief description of the drawings]

FIG. 1 is a vertical sectional view of a toothed belt.

FIG. 2 is a partial cross-sectional perspective view showing the belt tension member of the first embodiment.

FIG. 3 is a partially sectional perspective view showing a belt tension member of Example 2.

FIG. 4 is a partial cross-sectional perspective view showing a belt tension member of Example 3.

FIG. 5 is a partial cross-sectional perspective view showing a state where a plurality of glass fiber bundles of Example 5 are aligned.

FIG. 6 is a partial cross-sectional perspective view showing a belt tension member of Example 5.

FIG. 7 is a partial cross-sectional perspective view showing a state in which a plurality of ply-twisted yarns of Example 6 are drawn and aligned.

FIG. 8 is a partial cross-sectional perspective view showing a belt tension member of Example 6;

FIG. 9 is a schematic configuration diagram of a belt bending fatigue tester.

[Explanation of symbols]

 1 Toothed Belt 2, 7 Tensile Body 3 Back Rubber 4 Tooth Rubber 5 Tooth Cloth 6 Glass Fiber 8 Wool (Untwisted Thread) 9 Rubber Film 11, 13 Bands 12, 14 Tensile Body 31 Large Pulley 32 Small Pulley 33 Weight 34 Water A Test Belt

Claims (5)

[Claims] 1. A unidirectional twist after arranging a plurality of glass fibers, immersing them in an adhesive treatment liquid containing a mixture of a resorcin / formalin initial condensate and a latex as a main component, pulling it up and subjecting it to heat treatment A method for producing a tension member for a belt, which comprises adding 2. An undertwisted yarn is produced by collecting a plurality of glass fiber bundles and twisting them together, and a plurality of these undertwisted yarns are aligned to have a mixture of an initial condensate of resorcin-formalin and a latex as a main component. A method for producing a tension member for a belt, which comprises immersing in an adhesive treatment liquid, pulling it up, subjecting it to heat treatment, and then applying upper twist in the opposite direction to the above-mentioned lower twist. 3. A plurality of glass fiber bundles are aligned in a strip shape with no gaps and a flat cross section, and immersed in an adhesive treatment liquid containing a mixture of an initial condensate of resorcin / formalin and a rubber latex as a main component. A method for producing a tensile member for a belt, which comprises pulling up and subjecting it to a heat treatment to form a belt, and then twisting the belt in one direction. 4. A lower twisted yarn is produced by collecting a plurality of glass fiber bundles and twisting them into a lower twisted yarn, and a plurality of these lower twisted yarns are aligned in a strip shape so as to have a flat cross section without a gap and the initial stage of resorcinol / formalin. It is characterized in that a band-like material is formed by immersing in a bonding treatment liquid containing a mixture of a condensate and a rubber latex as a main component, pulling it up and subjecting it to heat treatment, and adding the above-mentioned lower twist and upper twist in the opposite direction A method for manufacturing a tension member for a belt. 5. A belt tensile member, characterized in that the belt tensile member according to any one of claims 1 to 4 is further immersed in a rubber sizing liquid and pulled up for heat treatment. Body manufacturing method.