JPS6175836A - Glass fiber code - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention [Industrial Application 9f] The present invention relates to a glass Mh fiber cord coated with RFL, and particularly a glass fiber cord suitable for use as a tensile member of rubber belts such as toothed belts. Regarding.

[Prior art] Built-in belts produce very little noise when compared to transmission devices using gears or chains, and do not cause any burrs like flat belts or V-healds. Its use in power transmission mechanisms is expanding.

Despite the advantages of this belt, if it is subjected to excessive tension or bending deformation, it will stretch, resulting in poor engagement with the pulley and the teeth of the belt going over the teeth of the pulley.
・The Pig phenomenon occurs.

Therefore, the toothed belt has 1. A tensile member is embedded in order to increase resistance to loads such as the above-mentioned 1' @ force and bending deformation, and a glass fiber cord is widely used as this tensile member.

Conventionally, as a glass fiber cord for tensile bodies.

ECG-150-3/13 or ECG-50-1/13
So, bottom 1? Commonly used are a@2', 5 and b with 13 twists, or 4.0 with 2.0 twists per twist. Note that the twisting directions are opposite in the upper and lower directions.

(Here, to explain the symbols such as ECG, E means E glass (alkali-free glass), C means long fiber, G means the filament diameter is nominally 94 m, and 150 or 50 means the strand is 15,000 yards/ Bond or 5000 yd/lb, 3/13. 1/13 3 or l is the number of strands to be twisted, 13 is the twisting force)・ In addition, Japanese Utility Model Publication No. 59-15780 discloses that three glass fiber strands are collected and pre-twisted with a twist coefficient of 0.4 or less as a tensile member of a toothed belt. , Gather these and twist them with a twist coefficient of 1.6 to 2.5.

Furthermore, in Japanese Utility Model Application Publication No. 59-83234, a glass fiber rope with i- and F twists in the same direction has a lower twist coefficient of 6.
Gas reference fliM code power (disclosed).

'The number of twists is 25. mm'4! It represents the number of twists of J twist (times/25 mm). In addition, in this specification, the number of twists in the first twist and the second twist may be referred to as the number of first twists and the number of first twists, respectively.

In addition, the twist coefficient described in Publication of Utility Model Publication No. 15780/1980 was calculated using T - F =, fi - T/2 g, 7 (D, the denier of the rope, T:
(number of twists per senna).

[Problems that the invention attempts to solve] Drive mechanisms for automatic and single-point overheave cam shafts are becoming more multi-axis and have higher loads. Or it is becoming difficult to meet the durability requirements.

I! Uchi, above ECG-'15'0-3/l 3 or E
C゛G-50-1/13, the number of upper twists and the number of lower twists are 4. It is becoming difficult to meet the required properties, especially the resistance to elongation, with conventional general cords in which the Q is 2.0 and the directions of the first twist O and the first twist are opposite.

In addition, Utility Model Publication No. 59-t57ao and Utility Model Application Publication No. 59-8
In short, the product described in the 3234 official gazette does not apply the first twist, or the number of first twists is very small. However, the cord tends to fray from the side of the belt, making it difficult to meet the required durability.

That is, to manufacture a belt using glass fiber cord,
A cylindrical piece is obtained by winding a glass fiber cord in a spiral shape, and this cylindrical piece is cut into the required width to form a belt.

Since this cutting direction is a direction that cuts the cord longitudinally, a longitudinal cross section of the cord is exposed on the side surface of the belt. Therefore, if you run the belt for a long time.

The core V begins to fray. Especially Jikko 59-157
In cords such as those described in Publication No. 80 and Japanese Utility Model Application Publication No. 59-83234, in which the first twist is not applied or the number of first twists is very small, and the final twist is applied in the same direction as the first twist. Is it one strand with a small number of twists? Because the exposed part of the cord is long, the cord easily frays, and the cord is subject to significant damage, even leading to breakage. 1. The number of lower twists and the number of upper twists are respectively 2.5.1. '3 ~ General products also show a similar trend.

Also, since such a cord has little twist, the cross-sectional shape of the cord tends to collapse, causing the P and L of the belt to deteriorate.

D (thickness t of the canvas on the belt surface and l/2 of the cord diameter
That is, P, L, D=t+D/2. ) +h
A: (It also has the disadvantage of being difficult to maintain.

"Role" h problem 1.' to solve f problem -1, -
, - In order to solve the problem, the glass fiber cord of the present invention is
One to five PFL-coated struts or a strand group made up of a plurality of these struts are twisted with the JJ direction of the upper twist and lower twist reversed.

Average diameter of glass fiber filament, 5-10 lm Number of filaments per strand: 100-8
Number of twists: 00 strands, 2, 5 to 4
, OF: Zemori @: L, 5 to 1.8.

The structure of the wooden glass fiber cord will now be explained in more detail.

The stent used in the glass fiber cord of the present invention is made of filaments with a V average diameter of 5 to 10 gm.
Made of wood and coated with PFL.

If the diameter of the filament is smaller than 5 pm, it will be difficult to stably produce a filament of a predetermined quality. On the other hand, lO
If the diameter is larger than Bm, is (74 property becomes smaller, M
The durability of the song decreases. Particularly preferred is 6-9pm.
It is.

The number of filaments contained in the strand is 100 to 80
A value of 0 is appropriate, and if the number is excessively decreased or increased beyond this range, productivity and alignment properties will decrease, and impregnating performance will deteriorate. Particularly preferred is 200-6o.

It's a book. Note that the strands may be taken out from one cake, or they may be taken out from two or more cakes at the same time. For example, if a strand or land consisting of 200 filaments is wound around one cake, 600 strands may be taken out.
When aligning the wooden filaments, it is sufficient to take out strands from three cakes in parallel and align them.

In the present invention, if filaments with an average diameter of 9 gm are used, the number of filaments in the entire cord may be 4,800 to 9,000.

When the iD of the filament changes, it is preferable to change the cord cross-sectional area to AIJ so that it is between the minimum number and maximum number calculated by the following formula.

Minimum number = (9,/D) 2. x4800 maximum number-
(9/D) j It is calculated by dividing the number by the number of prefectures from 6 to 20.

In the present invention, it is preferable to attach a binder to the filaments when spinning the filaments into a cake. This prevents damage caused by friction between the filaments and prevents them from fuzzing, thereby improving handling properties. This is also to improve the compatibility between the filament and the rubber. As this binder, one that is mainly composed of rubber latex and contains organonlan and a lubricant is used. The adhesion amount of the pinter is about 0.1"l, 0.wL% to the glass filament, especially 0.3-0
．． About 6 wt% is preferable; if it is less than 0.1 wt%, no improvement in the above properties is observed, and in particular, handling is likely to be difficult.

If the amount is more than 1.0 wt%, the impregnating properties of the RFL will deteriorate when the RFL is used for strand coating.

The glass fiber cord of the present invention is used by RFL bonding the above strands or a group of aligned strands.

To attach RFL, after immersing a strand or a group of strands (576 groups) made up of a plurality of strands in RFL solution,
It may be dried through a heating furnace (cure furnace), reacted, and solidified.

The R amount of this solid RjL is the glass fiber cord 1
14-25 parts by weight, especially 16-25 parts by weight per 0.0l/5 parts
22! It is preferable that Ili, i part.

If the amount is less than 14%, the adhesion with the rubber may be insufficient or bending fatigue may occur.25 'k: +'r
If the amount is greater than FCB, the RFL layer will be destroyed, resulting in poor foil adhesion.

The diameter of the glass filament 7 is 94 m, and the amount of RFL adhered to the glass fiber cord 100 7 warm part is 19iT<;f
? In the case of B, the RFL deposition thickness is about 1 m, and the adhesion amount is about 0.74 m and 1.3 m at the 14-fold portion and the 25πψ portion, respectively.

In addition, as the RFL in the form of L fertilizer in which the strands are immersed, the following are preferable.

'D The ratio (mole ratio) of resolun/futrumin is 27
1 to 1/3 is good, more than 2/1 is RFL
The strength of the coating decreases, the adhesive force with the rubber decreases, and 1/
If it is smaller than 3, gelation may occur depending on the temperature.

'The ratio of resorcinol and formalin to latex (isomorphic common ratio) is preferably 115 to 1/20, 1
When it is larger than 15, the adhesive strength decreases, and when it is smaller than 1/20, the bending fatigue resistance decreases.

Types of latex include Stire/Zotano 7
Rubber, chloropre/rubber, vinylpyrinno, etc. are preferred.

With uninvented glass fiber cord, RF
The L-covered strands or a group of 2 to 5 strands thereof are first twisted to a twist number of 25 to 4.0 to form one yarn bundle.

If the number of struts exceeds 5, the diameter of the pre-twisted yarn bundle will become excessive.

If the number of first twists is less than 25, when used in a toothed heddle, fraying is likely to occur from the exposed portion of the side surface of the belt as described above. Furthermore, if the number of first twists exceeds 40, the elongation will be large and the elongation of the cord will be excessive when used in a belt, which is inappropriate.

In the glass fiber cord of the present invention, a plurality of yarn bundles (preferably 6 to 20) are twisted in the opposite direction to the first twist with a twist depth of 1.5 to 18.

If the number of twists in I: and m is greater than 1.8, the cord will elongate excessively when used as a heddle, which is a mistake. If the number of twists is less than 15, although the elongation is small, the belt tends to fray from the sides, which is unsuitable.

FIG. 1 is a graph showing an example of the relationship between the elongation of a toothed belt and the number of ply twists. As shown in the figure, the number of ply twists is 1.
When the value exceeds 8, the elongation of the belt increases rapidly.

In the present invention, the directions of first twist and first twist are opposite directions. By doing this, the twist of the cord is balanced and the resistance to elongation is increased.

In the present invention, the ratio of the number of twists between the first twist and the first twist is preferably 1.8 to 2.2. In this way, the balance between the first twist and the first twist will be good, and the resistance to elongation will be improved. It gets even higher.

For glass fiber cords, it is essential to select the number of twists to be a cut. That is, in a glass fiber cord with a small number of twists, when the cord is pulled along a curved surface so as to be pressed against it, the cross-sectional shape of the cord tends to deform into a crushed shape similar to an oval. In such cases where the cords are easily deformed, the cords may deform during belt manufacturing, causing adjacent cords to break apart! I ended up wearing E, and the area around the rubber is @(.

Glass H of the present invention! In the i-fiber cord, the number of twists and the number of first twists are appropriately selected, so even if the cord is pulled along a curved surface, its cross-sectional shape maintains a nearly perfect circular shape, and the adverse effects described in F are avoided. do not have.

The relationship between the cord twist JA and the cord diameter in ECG-150 is shown below.

In the glass fiber cord of the present invention, 1I-
The r diameter is preferably 1.00-1.30 mm.

When the diameter is larger than 1.3 mm, the bending fatigue resistance decreases*L, and when the diameter is 00 mm or less, the bending fatigue resistance is excellent, but the initial tensile strength becomes insufficient.

Particularly preferred is 1.05 to 1.27 mm.

FIG. 2 is a graph showing an example of the relationship between the rate of decrease in tensile strength due to running of a toothed belt using a glass fiber cord and the diameter of the cord.

From FIG. 2, it is recognized that when the diameter exceeds 1.3 mm, the rate of decrease in tensile strength becomes considerably large.

FIG. 3 is a graph showing an example of the relationship between the tensile strength (initial tensile strength) of a belt using this glass fiber cord and the diameter of the cord.

The cord used was made of the same material as the cord before being subjected to the test shown in FIG. 1, and the belt width was 19.1 mm.

From Figure i3 When the diameter of the cord becomes smaller than l, Omm, the initial tensile strength of the belt does not reach the required value.

[Function] In the uninvented glass fiber cord, the directions of the first twist and twist are reversed, and the number of twists is selected appropriately, so it has excellent bending fatigue resistance and initial 111+ tensile strength,
It also has low elongation, and when applied to belts, there is extremely little fraying from the exposed side of the belt.
A highly durable belt can be obtained.

[Examples] The present invention will be described in more detail with reference to Examples and Comparative Examples below, but the invention is not limited to the following Examples unless the invention exceeds the gist thereof.

Example 1 ECG-150 whose number of first twists and number of first twists are as shown in Table 1
-3713 code was produced.

A toothed belt was also manufactured using this cord.

Tensile strength of cord, diameter and tensile strength of belt.

The measurement results of tensile strength after elongation and bending are shown in Table 1.
Note that other measurement conditions and the like are the same as in Example 2 below.

Table 1 Also, 1-Relationship between number of twists and belt elongation: jSI I
From FIG. 1, it is recognized that when the number of twists exceeds 1.8, the elongation increases.

Further, from Table 1 and FIG. 1, No. according to the example.

The belt using glass fiber cord No. 2 has a well-balanced initial tensile strength and elongation, and the tensile strength after bending is also superior to that of No. 1.3 (comparative example). Is recognized.

Incidentally, although the belt using cord No. 1 according to the comparative example has a high tensile strength and small elongation, the tensile strength after bending running is quite low.
The belt using cord No. 3 has a low tensile strength and a high elongation, and the tensile strength after running in a bending manner is also inferior to that of No. 12 according to the example.

Example 2 ECG-150-3/13, number of first twists/number of first twists = 19
Glass fiber cords having different numbers of ply twists between 1.0 and 2.5 were manufactured in the following manner, and a toothed belt was made SJm using these cords. This heddle was suspended between two pulleys, and the pulley was rotated for a predetermined period of time without applying a predetermined load to the pulley sleeve in a direction opposite to the pulley. The elongation of the toothed belt due to this running was measured. The results are shown in Figure 1.

The measurement conditions are as follows.

■；Ambient humidity temperature 80°C Number of pulley teeth: 18 teeth Pulley shaft load 45Kg Pulley rotation speed 8000rpm Running time: 400 hr This second embodiment is similar to the first embodiment.

It is recognized that when the number of L twists exceeds 1.8, the elongation increases significantly.

Note that when the number of ply twists is less than 1.5, the cord exposed on the belt side surface tends to fray. For example, when the number of ply twists is 1.3, the cord will become loose in an extremely short running time. It started to fray, and then the back rubber at the frayed part was damaged. When the number of twists was 1.45, the cord frayed, but the back rubber did not break. At 1.5 or higher, almost no fraying occurred.

Example 3 Glass fiber cords were manufactured using ECG-150 with various configurations ranging from 3/8 to 3/13. The number of twists is 1.7.
The number of first twists is 3.5. Number of first twists/number of first twists=206.

A toothed belt with a belt width of 19.1 mm was manufactured using this cord, and a running test was conducted by suspending this toothed heald from four pulleys placed at the corners of a rectangle.

The driving test conditions are as follows.

Environmental temperature: 80°C Number of teeth on drive pulley: 18 @ Number of rotations on drive pulley: 600 rpm Running time: 600 hr In addition, the tensile strength (initial tensile strength) of this belt before the running test was measured. The results are shown in FIG.

From FIG. 2 and FIG. 3, it can be seen that when the cord diameter exceeds 1.3 mm, the strength decrease rate due to belt running increases; If it is smaller than omm, the initial tensile strength will not meet the required value.

In Examples 1 to 3, 0.5% by weight of a binder mainly composed of rubber latex was attached to the strands.

The glass fiber cord is also coated with RFL. R
FL (7) attached fi bagarasu I@i1! =+ −F I
The amount is 19 parts by weight relative to O0 parts by weight.

〔effect〕

As detailed above, the glass fiber cord of the present invention has excellent bending fatigue resistance, high tensile strength, and low elongation.

When the glass fiber cord of the present invention is applied to a belt, there is extremely little fraying from the exposed part on the side of the belt.
A highly durable belt can be obtained.

Although the glass fiber hood of the present invention is suitable for use in toothed belts, it can also be used as a reinforcing material for various other products.

[Brief explanation of the drawing]

Figures 1 to 3 are graphs showing the measurement results in the examples. Figure 1 shows the relationship between belt elongation and number of ply twists, and Figure 2 shows the relationship between belt strength reduction rate after running. The wIJ3 diagram shows the relationship between the cord diameter and the Held tensile strength and the cord. Takeri from agent Tsuyoshi Shigeno, patent attorney

Claims (5)

[Claims] (1) A strand of 100 to 800 glass fiber filaments with an average diameter of 5 to 10 μm, or a group of multiple strands, is coated with resorcino formalin latex (hereinafter referred to as RFL) and twisted. A glass characterized in that a yarn bundle is first twisted in one direction with a number of twists of 2.5 to 4.0, and a plurality of the yarn bundles are twisted in the other direction with a number of twists of 1.5 to 1.8. fiber cord. (2) The glass fiber cord according to claim 1, wherein the number of twists in the first twist is 2.6 to 3.9. (3) The ratio of the number of twists in the first twist to the number of twists in the first twist is 1.8.
2.2. The glass fiber cord according to claim 1 or 2, wherein the glass fiber cord is 2.2. (4) The glass fiber cord according to any one of claims 1 to 3, wherein the cord has a diameter of 1.00 to 1.30 mm. (5) The strand is formed by binding filaments surface-treated with a spinning binder using RFL,
The glass fiber cord according to any one of claims 1 to 4, wherein the amount of RFL deposited is 14 to 25 parts by weight per 100 parts by weight of the glass fiber cord.