JPH06330428A - Combined yarn - Google Patents

Abstract

PURPOSE:To provide the combined yarns having favorable intermediate properties in terms of tensile strength and elongation and excellent in processability when to be made into woven or knitted fabrics. CONSTITUTION:A sheath yarn 3 of higher modulus is spirally wound on a core yarn 2 of lower modulus, and a press yarn 4 is then wound on said sheath yarn 3 in such a direction as to cross over the yarn 3, thus obtaining the objective combined yarn in a monolithic way.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to composite yarns, and more particularly to composite yarns having good intermediate properties in elongation and strength.

[0002]

2. Description of the Related Art Heretofore, in order to improve heat resistance and chemical resistance, various composite yarns have been proposed in which two types of yarns are twisted to impart intermediate properties. Is as is well known. By the way, a composite yarn having good intermediate properties in elongation and strength and excellent in processability when making it into a woven fabric, a knitted fabric, etc. does not yet exist, and a proposal for such a composite yarn has been desired. .

[0003]

SUMMARY OF THE INVENTION An object of the present invention is to provide a composite yarn which has good intermediate properties in elongation and strength and is excellent in processability when it is used as a woven fabric or a knitted fabric. is there.

[0004]

According to the present invention for achieving the above object, a side yarn made of a yarn having a larger modulus is spirally wound around an outer periphery of a core yarn made of a yarn having a smaller modulus and the outside thereof is provided. The gist is that the pressing yarn is wound around in the direction crossing the side yarn to be integrally configured.

[0005]

According to the present invention, since the side yarn having the larger modulus is wound around the core yarn having the smaller modulus, the side yarn having the larger modulus is easily stretched at the time of extension and the modulus of elasticity of the modulus is increased. The elongation can be made larger than that of a single large yarn, and the yarn with the larger modulus, which is superior in strength than the yarn of the core yarn with the smaller modulus, is provided as the side yarn. In addition, it is possible to improve the strength as compared with the configuration of the yarn having a small modulus alone. Furthermore, since the side yarn wound around the core yarn is held by the holding yarn, when the composite yarn is made into a woven fabric, a knitted fabric, or the like, the side yarn is effectively prevented from shifting and the workability is good.

[0006]

Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a partial front view showing a main part of a composite yarn according to the present invention. In this composite yarn 1, a side yarn 3 is spirally wound around an outer periphery of a core yarn 2 and the side yarn 3 is further provided outside thereof. The pressing yarn 4 to be pressed is wound and is fixed to each other with an adhesive or the like to form an integral structure.

The core yarn 2 is composed of a yarn having a modulus smaller than that of the side yarn 3, that is, a yarn having a large elongation. Side thread 3
Is composed of a thread having a modulus larger than that of the core thread 2, that is, a thread having a smaller elongation than the core thread 2 and a high strength. In the above relationship, the yarns used for the core yarn 2 and the side yarns 3 can be appropriately selected from conventionally known ones according to the intended purpose. For example, 66 nylon is used for the core yarn 2 and aromatic polyamide is used for the side yarn 3. It can be preferably used.

The pressing yarn 4 is spirally wound around the side yarn 3 in a direction opposite to the winding direction of the side yarn 3. The pressing yarn 4 is not particularly limited as long as it can prevent the side yarn 3 wound around the core yarn 2 from being displaced. For example, Woolly (Ken reduction) type 66 nylon or the like is preferably used. As described above, in the composite yarn 1 of the present invention, the yarn having the smaller modulus is used as the core yarn 2, and the yarn having the larger modulus is spirally wound around the core yarn 2 as the side yarn 3. The side thread 3 having a larger modulus is wound around the core thread 2 having a smaller modulus, so that the side thread having a larger modulus is wound around the side thread 3 in a direction intersecting with the side thread 3. 3 can be easily stretched, and the elongation can be made larger than that of a yarn having a large modulus alone, and the yarn having a larger modulus, which is superior in strength to the core yarn 2 having a smaller modulus, is the side yarn 3. Therefore, it is possible to improve the strength as compared with the construction of the yarn having a small modulus alone, and it is possible to have a good intermediate property in elongation and strength.

Furthermore, since the side yarn 3 wound around the core yarn 2 is held by the holding yarn 4, the deviation of the side yarn 3 is effectively prevented when the composite yarn 1 is made into a woven fabric or a knitted fabric. You can Further, it is possible to obtain the required high elongation property by changing the thickness of each of the core yarn 2 and the side yarn 3, the number of twists, and the number of windings of the side yarn 3. Hereinafter, the composite yarn of the present invention will be described more specifically.

As shown in Table 1, the core yarn is 1260D / 1.
Structure 66 nylon (twist number 28 times / 10 cm), 1 for side thread
Aromatic polyamide with a structure of 500D / 1 [Teijin Technora] (twist number: 10 times / 10cm), 210D / 1 for the holding thread
Woolly structure type 66 nylon (27
(Twice / 10 cm), and the side thread around the core thread 27 times / 1
Wrap it at a rate of 0 cm, and put a pressing thread on it 27 times / 1
Wound 0 cm to make a composite yarn. The side yarn and the pressing yarn were adhered to the core yarn by an NBR type RFL adhesive. When the relationship between the cutting strength and the elongation of this composite yarn was measured, the results shown in FIG. 2 were obtained. In addition, as a comparative example, FIG. 2 also shows the results when 66 nylon and aromatic polyamide [Teijin Technora] shown in Table 1 were used alone. However, in FIG. 2, A shows the SS curve of the composite yarn of the present invention, B shows the yarn of 66 nylon alone, and C shows the yarn of Technora alone.

[0011] As is clear from FIG. 2, the composite yarn of the present invention has a breaking strength of 30.5 kgf, which is significantly higher than the constitution of a yarn having a small modulus (66 nylon) (cutting strength: 16.0 kgf). Also, in terms of elongation, the intermediate elongation at 4.5 kgf is 7.0%, the breaking elongation is 16.4%, and the yarn having a large modulus (aromatic polyamide) alone is used (at 4.5 kgf). Intermediate elongation: 0.4%, Cutting elongation: 5.
0%) and has good intermediate properties in elongation and strength.

Next, as one application example using the above-described composite yarn 1 of the present invention, a high-pressure rubber hose used for a hydraulic system of a construction vehicle or a hydraulic system of a power steering of an automobile will be described. FIG. 3 shows a partially cutaway perspective view of a high-pressure rubber hose using the composite yarn 1 of the present invention as a reinforcing layer. The high-pressure rubber hose 5 includes an intermediate rubber layer 6 and an outer rubber layer 7. Reinforcing layers 9a and 9b are provided via a layer 8.

The inner rubber layer 6 includes, for example, nitrile butadiene rubber (NBR), hydrogenated nitrile butadiene rubber (HNBR), and chlorosulfonated polyethylene (CS).
M) or the like is used, CSM or the like is used for the outer rubber layer 7, and NBR or the like is used for the intermediate rubber layer 8 as in the conventional case. The reinforcing layers 9a and 9b form the composite yarn 1 at a braid angle of 47 ° to 5 °.
It is constructed by braiding at 5 °. Preferably 51 ° to 5
It is better to set it to 4 °. A core yarn 2 constituting the composite yarn 1,
As the side thread 3 and the pressing thread 4, 66 nylon for the core thread 2, aromatic polyamide for the side thread 3, and wooly (Ken reduction) type 66 nylon for the pressing thread 4 are preferably used.

As described above, by using the composite yarn 1 of the present invention as the reinforcing layer 9 of the high-pressure rubber hose 5, it is possible to use a reinforcing layer composed of 66 nylon alone or a reinforcing layer composed of aromatic polyamide alone. Also, the strength and elongation have intermediate properties, and the high expansion amount and the high pressure resistance of the high-pressure rubber hose 5 can be satisfied at the same time. In other words, a pressure-up type high pressure hose has been required in recent years as the performance of systems such as power steering of construction vehicles and automobiles has increased, and a reinforcement layer made of 66 nylon alone has no sufficient strength to compensate for the lack of strength. It is necessary to increase the amount of the reinforcing layer driven in, but this increases the diameter of the hose, which solves the problem that the current system cannot be used due to poor fitting of the metal fittings. Further, since the reinforcement layer made of a high-strength aromatic polyamide alone has a small elongation, there is a drawback that the expansion amount of the hose, which is important for the purpose of absorbing pulse pressure vibration and sound of the pump to be mounted, is small. Be improved.

Further, the contact area with the rubber is increased, the adhesiveness can be greatly improved, and the pressure resistance and the expansion amount can be improved by changing the thickness of the core yarn 2 and the side yarn 3 and the winding state. Can be set relatively freely.
Hereinafter, the high-pressure rubber hose using the composite yarn of the present invention will be described more specifically.

The reinforcing yarns shown in Table 1 were used for the reinforcing layer, and Table 2
Of the present invention, which uses the composite yarn of the present invention having the structure shown in FIG. 3 according to the specifications of No. 1, Comparative Hose 1 (using the reinforcing yarn of Comparative Example 1), and Comparative hose 2 (using the reinforcing yarn of Comparative Example 2) Were made respectively. Each of these hoses was subjected to measurement tests of expansion amount, rate of change in length, breaking pressure, high-pressure impact performance, and adhesion under the conditions shown below, and the results shown in Table 2 were obtained. Expansion amount measurement test According to JASO M319 6.11. Length change rate measurement test It conforms to JIS K 6330 4.2.1 (1) (a). Bursting pressure measurement test According to JIS K 6330 4.2.1 (2). High-pressure impact performance measurement According to JIS K 6379 7.7. Adhesive force measurement test According to JIS K 6256.

[0017] As is clear from Table 2, the hose of the present invention using the composite yarn of the present invention has a significantly improved expansion amount and adhesive force per 1 m at 60 kgf / cm ^{2 with} respect to the comparative hose 1. I understand. In addition, the rate of change in length and high-temperature impact performance are at the same level, and the breaking pressure shows approximately the same value even though the number of composite yarns used is 1/2 that of the comparative hose 1, and when the number of yarns is the same. Is converted from the result of comparative hose 2 to 9
It can be seen that the breaking pressure is about 35 kgf / cm ^2, which is significantly higher than the comparative hose 1.

Further, it can be seen that the breaking pressure is inferior to the comparative hose 2, but the expansion amount is extremely large, which is 5 times, and the rate of change in length and the adhesive force are also greatly improved. Therefore,
It can be seen that the hose of the present invention simultaneously satisfies high pressure resistance and high expansion amount. The composite yarn of the present invention is not limited to the application to the above-mentioned high-pressure rubber hose, but is also applicable to general industrial materials such as belts, in which the composite yarn that requires good intermediate properties in elongation and strength is used. It goes without saying that it can be applied.

[0019]

As described above, according to the present invention, since the side yarn having the larger modulus is wound around the core yarn having the smaller modulus, it becomes easier to stretch at the time of elongation than the constitution of the yarn having the large modulus alone. It is possible to improve the strength as compared with the structure of a single yarn having a small modulus, and it is possible to obtain a composite yarn having good intermediate properties in elongation and strength. In addition, since the side yarn wound around the core yarn is held by the holding yarn, when the composite yarn is made into a woven fabric or a knitted fabric, it is possible to effectively prevent the side yarn from being displaced and the workability is extremely good. is there.

[Brief description of drawings]

FIG. 1 is a partial front view showing a main part of a composite yarn of the present invention.

FIG. 2 is a graph showing the relationship between the cutting strength and the elongation of the composite yarn of the present invention.

FIG. 3 is a partially cutaway perspective view of a high-pressure rubber hose using the composite yarn of the present invention.

[Explanation of symbols]

 1 Composite yarn 2 Core yarn 3 Side yarn 4 Holding yarn

Claims (1)

[Claims] 1. A core thread made of a thread having a smaller modulus is wound around a side thread made of a thread having a larger modulus in a spiral shape, and a holding thread is wound around the side thread in a direction intersecting with the side thread. A composite yarn that is integrally configured.