JP6945323B2 - Extra-thick dip cord and its manufacturing method - Google Patents

Description

The present invention relates to an extra-thick dip cord, and more particularly to an extra-thick dip cord used for rubber products such as tires, belts, hoses, and bellows (joints).

Steel cords or fiber cords for rubber reinforcement are embedded in rubber products such as pneumatic tires, power transmission belts, hoses, and bellows. As the fiber cord, a plurality of high-strength fibers such as aramid fibers are arranged to form a twisted yarn, which is immersed in an adhesive treatment solution such as resorcin, formalin, and rubber latex (hereinafter referred to as RFL) solution to adhere to rubber. Those with sex (dip code) are known. Fiber cords are lighter than steel wires, and aramid fibers are often used.

By the way, steel cords are used for reinforcing cords for rubber products such as rubber crawlers and conveyor belts, but in recent years, there is a strong need for weight reduction and high strength. In addition, since steel cords cannot be incinerated, there are concerns about environmental problems. However, although various findings regarding high-strength fiber cords have been reported, fiber cords capable of achieving both high strength and adhesiveness that can meet the above needs are not known.

Patent Document 1 proposes to use a fiber cord instead of the steel wire used for the bead core in order to reduce the tire weight due to fuel saving and the like. This is a technique for forming a bead core by spirally winding an aramid fiber cord having a positive fineness of 10,000 denier or more around a core made of a nylon or polyester monofilament cord having a diameter of 2 to 9 mm. However, the thickness of the cord forming the bead core is 2.1 mm at the maximum, and the strength of one cord is limited to 4500N.

Patent Document 2 states that when a shocking force is applied to a conductive belt, especially in a serpentine drive, the fiber cord capable of absorbing and mitigating the shock is not a low elastic fiber such as nylon or polyester, but a fiber cord. It has been proposed to use highly elastic aramid fibers. By wrapping the aramid fiber cord around the core made of the aramid fiber cord and forming a hybrid cord, it is a technology to obtain a fiber cord that is highly strong and has both a low elastic region and a high elastic region and has excellent adhesiveness. be.

In Patent Document 3, in order to solve the problem in aircraft tires, as a fiber cord having high strength, high pressure, deformability and expandability, a fiber cord having a tensile strength of 9 g / d and an elongation at break of 20% or more is described. Proposed. Instead of using steel wire or para-aramid fiber with high strength but low elongation at break alone, para-aramid fiber is wrapped around the core made of meta-aramid fiber to form a hybrid cord. It is a technology.

However, in the hybrid cord disclosed in Patent Document 2, the yarn fineness of the core and the sheath is 880 dtex (core), 3340 dtex (sheath), and the total is 4200 dtex. The hybrid cord disclosed in Patent Document 3 has a core and sheath yarn fineness of 3500 dtex and a total of 7000 dtex, but the diameter of the hybrid cord is at most about 1 to 1.5 mm, and is used as a substitute for the steel cord for caterpillar. Is lacking in strength.

On the other hand, if a large number of bottom-twisted cords are bundled and top-twisted, a thick cord can be theoretically obtained. For example, in Patent Document 4, in order to obtain a rubber belt satisfying a desired strong retention rate, 9 to 18 child ropes in which aramid fibers are twisted downward are bundled and twisted upward to prepare a cord, and then the cord is used. It has been proposed to impregnate with an RFL solution or the like. However, the total fineness of the obtained cord is 30,000 dtex, and the tensile strength of the cord is limited to about 6000 N. In other words, the reality is that simply by increasing the number of cords, it is not possible to obtain cords that are thick and have adhesive strength and strength with rubber.

Japanese Unexamined Patent Publication No. 2000-025429 (Claims, Table 2, Fig. 2, etc.) JP-A-2009-024285 (Claims, FIG. 1, etc.) Japanese Patent Application Laid-Open No. 2014-500413 (Claims, paragraph [0003], FIGS. 5-6, etc.) Japanese Unexamined Patent Publication No. 2003-148563 (Claims, Table 1, etc.)

An object of the present invention is to solve the problems in the prior art and to provide an extra-thick dip cord having high strength and a thickness comparable to that of a steel cord and a method for manufacturing the same.

The present invention is based on the findings obtained from the results of various property studies on rubber reinforcing fibers, that is, after a plurality of twisted yarn cords in which lower twist and upper twist are applied to aramid fibers are combined to apply an adhesive, and further. By combining them and applying top twist, an extra-thick dip cord with improved breaking strength can be obtained, and although the details are unknown, the fiber cord with an adhesive added to the twisted cord to be combined. It was made based on the knowledge that the adhesive strength of the cord can be secured if the cords are properly arranged.

That is, the present invention is as follows.

(1) A twisted cord in which a plurality of under-twisted aramid fibers are combined and top-twisted, the cord diameter is 3.1 mm or more, and an adhesive is applied to the inside of the cord. The twisted yarn cords are arranged substantially evenly , the total fineness is 40,000 dtex or more and 89,100 dtex or less, and the breaking strength is 7,000 N or more and 11,600 N or less. Dip code.
( 2 ) The extra-thick dip cord according to (1) above, wherein the adhesive is an adhesive containing resorcin, formalin, and latex (RFL) as a main component.
( 3 ) The extra-thick dip cord according to (1) or (2) above, wherein the aramid fiber is a polyparaphenylene terephthalamide fiber.
( 4 ) A plurality of single-twisted (downward-twisted) aramid fibers (raw yarns) are combined and an upper-twisted twisted yarn cord is twisted with an adhesive, and a plurality of twisted yarn cords are combined and upper-twisted. The extra-thick dip code according to any one of (1) to ( 3) above.
( 5 ) The extra-thick dip cord according to any one of (1) to (3 ) above, which is obtained by combining a plurality of extra-thick dip cords according to (4) above and twisting them upward.
( 6 ) The first step of applying a single twist (lower twist) to the aramid fiber (raw yarn), and
The second step of combining multiple lower-twisted cords and applying upper-twisting to obtain a twisted yarn cord,
An adhesive applying step of applying an adhesive to the raw yarn or the twisted yarn cord obtained in the second step, and
The production of the extra-thick dip cord according to any one of (1) to (5) above , which includes a third step of combining a plurality of twisted yarn cords to which the adhesive is applied and performing top twisting. Method.
( 7 ) The method for producing an extra-thick dip cord according to (6 ) above, which further includes a fourth step of combining a plurality of twisted yarn cords obtained in the third step and performing top twisting.

According to the present invention, it is possible to obtain an extra-thick dip cord capable of achieving both high strength and high adhesiveness, and it is possible to use it as a substitute for a steel cord used for a conveyor belt, a rubber crawler, etc., which is practical. High value. It is lighter than a steel cord, so it is very convenient. High practical value.

It is sectional drawing which shows the example of the extra-thick dip cord of this invention enlarged.

As the aramid fiber in the extra-thick dip cord of the present invention, a para-aramid fiber having excellent tensile strength is preferably used. Examples of the para-aramid fiber include polyparaphenylene terephthalamide fiber (manufactured by DuPont in the United States and Toray DuPont Co., Ltd., trade name "Kevlar" (registered trademark)), copolyparaphenylene-3,4'-oxydi. Phenylene terephthalamide fiber (manufactured by Teijin Co., Ltd., trade name "Technora" (registered trademark)) can be mentioned, and among these para-aramid fibers, polyparaphenylene terephthalamide fiber having a high elasticity is particularly preferable. preferable.
As these aramid fibers, those produced by a known method can be used. The aramid fiber is a fiber having at least one divalent aromatic group which may be usually substituted in the repeating unit of the polymer forming the fiber, and is particularly a fiber having at least one amide bond. There is no limitation, and it may be referred to as a total aromatic polyamide fiber or an aramid fiber, and the "divalent aromatic group which may be substituted" has one or more substituents which are the same as or different from each other. It means a divalent aromatic group that may be used.

In the extra-thick dip cord of the present invention, the total fineness of the aramid fiber (raw yarn) to be twisted under is not particularly limited, but is preferably in the range of 200 to 5,000 dtex, more preferably in the range of 500 to 3,500 dtex. A range of 000 to 3,500 dtex is more preferred. The larger the value of dtex, the thicker the aramid fiber. The single yarn diameter of the raw yarn is preferably in the range of 0.5 to 7 dtex / filament, and more preferably in the range of 1 to 5 dtex / filament. When the fiber diameter of the raw yarn is in the range of 1 to 5 dtex / filament, stable production can be performed during the production of the raw yarn. On the other hand, if the fiber diameter of the raw yarn is out of the range of 1 to 5 dtex / filament, the operability such as yarn breakage deteriorates during the production of the raw yarn, which adversely affects the quality.

The extra-thick dip cord of the present invention is a combination of a plurality of twisted yarn cords in which a plurality of single-twisted (downward-twisted) aramid fibers (raw yarns) are combined and an adhesive is applied to the upper-twisted twisted yarn cord. It is threaded and top-twisted. Further, a plurality of the above-mentioned extra-thick dip cords are combined and twisted upward.

The extra-thick dip cord of the present invention can be preferably manufactured by adopting the following manufacturing method. That is, the extra-thick dip cord has a first step of applying a single twist (lower twist) to an aramid fiber (raw yarn) and a second step of combining a plurality of lower twist cords and applying an upper twist to obtain a twisted yarn cord. An adhesive applying step of applying an adhesive to the raw yarn or the twisted yarn cord obtained in the second step, and a third step of combining a plurality of twisted yarn cords to which the adhesive is applied and performing top twisting. include. Further, the method for producing an extra-thick dip cord of the present invention can include a fourth step of combining a plurality of twisted yarn cords obtained in the third step and performing top twisting.

In order to obtain the above-mentioned extra-thick dip cord, a single twist (lower twist) is applied to the aramid fiber (raw yarn), and a plurality of the lower twisted aramid fibers are combined and upper twisted. In this case, for example, when the total fineness of the raw yarn is 3,300 dtex, and three down-twisted aramid fibers (raw yarn) are combined and top-twisted, the total top-twisted aramid fiber is total. The fineness is 9,900 dtex. Further, when an adhesive is applied to the top-twisted aramid fiber cord, and then six cords to which the adhesive is applied are combined and top-twisted, the total fineness of the obtained extra-thick dip cord is 59, It becomes 400 dtex. However, in reality, the weight of the aramid fiber in the unit length should be slightly higher than the above value (dtex) due to twisting.

FIG. 1 shows an enlarged cross-sectional view of the extra-thick dip cord. 1 is an extra-thick dip cord, 2 is a twisted yarn cord to which an adhesive is applied, and 3 is a single-twisted (down-twisted) cord. Here, an example is shown in which seven twisted yarn cords, which are upper-twisted lower-twisted cords, are combined and upper-twisted.

As shown in FIG. 1, the twisted cord 2 to which the adhesive is applied becomes an extra-thick dip cord 1 by being top-twisted by a twisting machine. Inside the extra-thick dip cord 1, the twisted yarn cords 2 to which the adhesive is applied are arranged substantially evenly. Since the adhesive is adhered to the surface of the extra-thick dip cord to which the adhesive is applied, the adhesiveness of the outer layer improves the adhesiveness between the extra-thick dip cord and the rubber. On the other hand, the adhesive inside the extra-thick dip cord has the effect of suppressing the cords from coming into direct contact with each other when the twisted cord to which the adhesive is applied is twisted upward, thereby making the extra-thick dip cord fatigue resistant. Is improved.

The cord diameter of the extra-thick dip cord is preferably 3.1 mm or more, and 4 . It is more preferably 0 mm or more. If the cord diameter is less than 2.5 mm, it is difficult to obtain a high-strength cord from experience. Preferably the breaking strength is more than 7,000 N, and more preferably 9, 000n more.
The total fineness of the extra-thick dip cord is preferably 40,000 dtex or more, more preferably 50,000 dtex or more, and further preferably 80,000 dtex or more. If the total fineness is 40,000 dtex or more, sufficient strength can be obtained even when used for a rubber crawler or a conveyor belt, and if it is less than 40,000 dtex, the design required strength value for the above application cannot be satisfied.

In the present invention, the twisting coefficient (K) of the twisted cord is represented by the following formula.
Twist coefficient (K) = 0.0033 x T x D ^1/2
(However, T; the number of twists (T / 10 cm), D; the total fineness (dtex) is shown.)

(First step)
For the twisted cord, two or more aramid fibers are aligned, twisted appropriately and twisted on one side to produce a bottom twisted cord. The twist coefficient of the single-twisted cord is preferably in the range of 0.5 to 6, and more preferably in the range of 0.5 to 3. The durability of the cord is improved by adding twist to the fiber, but if the twist coefficient is too small, the fatigue resistance of the fiber cord is lowered. On the other hand, if the twist coefficient is too large, the strength of the fiber cord tends to decrease.

(Second step)
Next, two or more lower twisted cords are bundled to produce a twisted yarn to which an upper twist is added. The twist coefficient of the upper twist cord is preferably in the range of 1 to 10, and more preferably in the range of 2 to 6. The durability of the cord is improved by adding twist to the fiber, but if the twist coefficient is too small, the fatigue resistance of the fiber cord is lowered. On the other hand, if the twist coefficient is too large, the strength of the fiber cord tends to decrease.
The number of lower-twisted cords to be twisted is not particularly limited as long as it is two or more, and examples thereof include single-twisted yarns and twisted yarns. The number of yarns to be combined is preferably in the range of 3 to 11, more preferably in the range of 3 to 9, and even more preferably in the range of 3 to 6. If the number of single-twisted cords is small, it may be difficult to obtain an extra-thick dip cord with a total fineness of 40,000 dtex or more, while if the number is large, it may be difficult to twist them in relation to the device (twisting machine). ..

(Adhesive application process)
In the adhesive applying step, it is preferable to apply an adhesive to the twisted yarn cord obtained in the second step. An adhesive may be applied to the raw yarn, but the adhesive may adhere and filament breakage may occur frequently in the plying process, resulting in fluffing, which may not be possible as a rubber reinforcing cord.

The type of adhesive is not particularly limited, and known rubber adhesives can be used. Among them, an adhesive containing resorcin, formalin, and latex (RFL) as a main component is preferable because it is excellent in permeability / adhesion to a twisted cord and adhesiveness to rubber.
Examples of the latex include vinylpyridine-styrene-butadiene copolymer latex, styrene-butadiene latex, acrylonitrile-butadiene latex, chloroprene latex, chlorosulfonated polyethylene latex, acrylate latex and natural rubber latex. Resolcin and formaldehyde can be used alone, or a novolac-type condensate obtained by pre-condensing resorcin-formaldehyde under an acid catalyst or an alkali catalyst can be used. The adhesive may be mixed with one or more compounds selected from an epoxy compound, a blocked polyisocyanate compound, an ethyleneimine compound, a reaction product of polyisocyanate and ethyleneimine, and the like.

The solid content concentration of the adhesive is preferably in the range of 2 to 20% by mass. A known adhesive viscosity modifier can also be added.

The amount of the applied adhesive (solid content) adhered is preferably 1 to 15% by mass, more preferably 3 to 12% by mass, still more preferably 5 to 12% by mass, and particularly preferably 5 with respect to the raw yarn or the twisted yarn cord. It is 10% by mass. If the amount of adhesive adhered is 1% by mass or more, adhesiveness to rubber can be imparted, and if it is 15% by mass or less, excess adhesive is prevented from falling off during twisting to generate debris. be able to.

As a method for applying the adhesive, a known dip treatment method can be adopted in which an adhesive containing RFL as a main component is dipped and applied to the twisted cord using a dipping machine, and then dried and heat-treated under tension conditions. .. The dip process from the immersion of the adhesive to the heat treatment may be completed only once, or may be completed in two steps. In order to obtain high strength, a single dip treatment with a small heat history is preferable, and in order to obtain high adhesive strength, after performing the dip treatment with at least a first adhesive treatment liquid containing an epoxy compound, RFL is applied. It is preferable to perform a double dip treatment in which the dip treatment is performed with the second adhesive treatment liquid as the main component. The adhesive component when the dip treatment is performed twice may be the same component or different from each other.

The heat treatment conditions are preferably a drying temperature of 100 to 160 ° C., a residence time of 0.5 to 5 minutes, a heat treatment temperature of 200 to 260 ° C., and a residence case of 0.5 to 5 minutes.

(3rd step, 4th step)
Next, a plurality of twisted yarn cords to which the adhesive is applied are bundled and top-twisted (third step). The number of twisted cords to which the adhesive to be twisted is applied is not particularly limited as long as it is two or more, and examples thereof include single-twisted yarn and various twisted yarns. The number of yarns to be combined is preferably in the range of 2 to 11, more preferably in the range of 3 to 9, and even more preferably in the range of 3 to 6. If the number of twisted yarn cords is small, it becomes difficult to obtain an extra-thick dip cord having a total fineness of 40,000 dtex or more, while if the number of twisted yarn cords is large, the adhesive is rubbed against each other and filament breakage is likely to occur.

Further, for the purpose of obtaining an extra-thick twisted yarn cord having a higher total fineness, a plurality of twisted yarn cords obtained in the third step may be bundled and top-twisted (fourth step). In the fourth step, the number of twisted cords to which the adhesive to be twisted is applied is preferably in the range of 2 to 11, more preferably in the range of 3 to 9, and even more preferably in the range of 3 to 6.

The twist coefficient of the upper twist cord in the third step and the fourth step is preferably in the range of 1 to 10, and more preferably in the range of 2 to 6. The durability of the cord is improved by adding twist to the fiber, but if the twist coefficient is too small, the fatigue resistance of the fiber cord is lowered. On the other hand, if the twist coefficient is too large, the strength of the fiber cord tends to decrease.

In the first to fourth steps, a known twisting machine such as a ring twisting machine, a double twister twisting machine, or an aroma twisting machine can be used as the twisting method. Even if the method is to twist the aramid fiber yarns once, then wind them up, and then combine two or more of the obtained lower twisted yarns and twist them upwards, two or more aramid fiber yarns are twisted separately. A method may be used in which the obtained lower twisted yarns are not wound up and then twisted upward with each other.

Since the extra-thick dip cord of the present invention thus obtained has high strength and high adhesive strength, it can be used not only for applications such as conveyor belts and rubber crawlers as an alternative to steel wires, but also for automobiles, etc. Various tires for aircraft, etc .; various belts such as transmission belts, V-belts, timing belts; various hoses such as radiator hoses, heater hoses, power steering hoses; etc. can.

Hereinafter, the present invention will be described in more detail with reference to examples, but the present invention is not limited thereto. Further, in the following examples and the like, "mass%" is abbreviated as "%" unless otherwise specified. The evaluation method of the fiber cord described in the examples is as follows.

(1) Cord diameter Measured according to JIS L 1017: 2002 using a cord diameter measuring instrument (manufactured by Toyo Seiki).
(2) Measured according to JIS L 1017: 2002 using a breaking strong belt rope tensile tester (using a spiral type gripper). Test length 70 cm, speed 200 mm / min.
(3) Adhesive strength Measured according to JIS L 1017: 2002.
(4) Rank with rubber Measure the amount of rubber on the surface of the cord by visual judgment.
◯; Rubberized amount 80% or more ×; Rubberized amount less than 80%

(Example 1)
Two polyparaphenylene terephthalamide fibers (trade name: Kevlar (R), fineness of 1,650 dtex, number of filaments: 1,000) manufactured by Toray DuPont Co., Ltd. are drawn together using a ring twisting machine. Under-twisting was performed in the Z direction under the conditions shown in Table 1 to obtain a under-twisted twisted yarn cord (first step).
Next, three twisted yarn cords obtained were combined and twisted in the S direction under the conditions shown in Table 1 to obtain a twisted yarn cord (second step).
The obtained twisted cord was immersed in a first adhesive treatment liquid containing an epoxy compound as a main component, and heat-treated at 140 ° C. for 2 minutes to remove water, and then heat-treated at 230 ° C. for 1 minute. Further, it is immersed in a second adhesive treatment liquid containing resorcin, formalin, and rubber latex (RFL) as a main component, and heat-treated at 140 ° C. for 2 minutes to remove water, and then heat-treated at 230 ° C. for 1 minute. To obtain a twisted yarn cord to which an adhesive was applied (adhesive application step).
Next, six twisted yarn cords to which the adhesive was applied were combined and twisted in the Z direction under the conditions shown in Table 1 to obtain a twisted yarn cord (extremely thick dip cord) (third step).

(Example 2)
In the third step of Example 1, a twisted yarn cord (extremely thick dip cord) was obtained in the same manner as in Example 1 except that five twisted yarn cords obtained in the adhesive applying step were combined.

(Example 3)
A bottom-twisted yarn cord was obtained in the same manner as in Example 1 (first step). Next, three twisted yarn cords obtained were combined and twisted in the S direction under the conditions shown in Table 1 to obtain a twisted yarn cord (second step).
Next, an adhesive applying step was carried out in the same manner as in Example 1 to obtain a twisted yarn cord to which the adhesive was applied.
Next, three twisted yarn cords to which the adhesive was applied were combined and twisted upward in the Z direction under the conditions shown in Table 1 to obtain a twisted yarn cord (third step).
Next, three twisted yarn cords obtained were combined and twisted in the S direction under the conditions shown in Table 1 to obtain a twisted yarn cord (extremely thick dip cord) (fourth step).

(Example 4)
The same method as in Example 1 to two polyparaphenylene terephthalamide fibers (trade name: Kevlar (R), fineness of 1,650 dtex, number of filaments: 1,000) manufactured by Toray DuPont Co., Ltd. Then, the adhesive was applied (adhesive application step).
Next, the polyparaphenylene terephthalamide fiber to which the adhesive was applied was under-twisted in the Z direction using a ring twisting machine under the conditions shown in Table 1 to obtain a under-twisted twisted yarn cord (first step).
Next, nine twisted yarn cords obtained were combined and twisted in the Z direction under the conditions shown in Table 1 to obtain a twisted yarn cord (second step).
Next, three twisted yarn cords obtained were combined and twisted in the S direction under the conditions shown in Table 1 to obtain a twisted yarn cord (extremely thick dip cord) (third step).

(Comparative Example 1)
In Example 1, a twisted yarn cord (extremely thick dip cord) was obtained under the same conditions as in Example 1 except that the adhesive applying step was carried out after the third step.

From Table 1, after applying an adhesive to a cord obtained by combining a plurality of twisted yarn cords, the cords to which the adhesive is applied are combined and twisted upward to obtain a cord diameter of 3.1 mm or more and a total fineness of 40,000. It can be seen that an extra-thick dip cord having a dtex or more, a breaking strength of 7,000 N or more, and a good adhesive force with rubber can be obtained. Further, the dip cord obtained by combining the twisted yarn cords to which the adhesive is applied has a better result in the adhesive strength with the rubber than the dip cord (Comparative Example 1) in which the adhesive is applied to the combined yarns. It can be seen that

From Example 3, an adhesive is applied to a cord obtained by combining a plurality of twisted yarn cords, the cord to which the adhesive is applied is combined and top-twisted, and then the obtained cord is combined and top-twisted. By doing so, it can be seen that an extra-thick dip cord having a cord diameter of 4 mm or more, a total fineness of 80,000 dtex or more, a breaking strength of 10,000 N or more, and a good adhesive force with rubber can be obtained.

The extra-thick dip cord of the present invention is useful for reinforcing rubber products such as tires, belts, and hoses.

1 Extra-thick dip cord 2 Twisted cord with adhesive 3 Single-twisted (bottom twisted) cord

Claims (7)

A twisted cord in which a plurality of under-twisted aramid fibers are combined and top-twisted. The cord diameter is 3.1 mm or more, and an adhesive is applied to the inside of the cord. Are arranged almost evenly,
The twisted yarn cord is obtained in the first step of applying a lower twist to an aramid fiber, the second step of combining a plurality of lower twisted cords and applying an upper twist to obtain a twisted yarn cord, and the raw yarn or the second step. It is manufactured by a method including an adhesive applying step of applying an adhesive to the twisted yarn cord and a third step of combining a plurality of twisted yarn cords to which the adhesive is applied and performing top twisting.
The total fineness is 40,000 dtex or more and 89,100 dtex or less, and
An extra-thick dip cord characterized by a breaking strength of 7,000 N or more and 11,600 N or less. The extra-thick dip cord according to claim 1 , wherein the adhesive is an adhesive containing resorcin, formalin, and latex (RFL) as a main component. The extra-thick dip cord according to claim 1 or 2 , wherein the aramid fiber is a polyparaphenylene terephthalamide fiber. Multiple aramid fibers (raw yarns) that have been unilaterally twisted (lower twisted) are combined and twisted with an adhesive applied to the upper-twisted twisted cord. The extra-thick dip code according to any one of claims 1 to 3. The extra-thick dip cord according to any one of claims 1 to 3, wherein a plurality of extra-thick dip cords according to claim 4 are combined and top-twisted. The first step of applying a single twist (lower twist) to the aramid fiber (raw yarn), and
The second step of combining multiple lower-twisted cords and applying upper-twisting to obtain a twisted yarn cord,
An adhesive applying step of applying an adhesive to the raw yarn or the twisted yarn cord obtained in the second step, and
The method for producing an extra-thick dip cord according to any one of claims 1 to 5, further comprising a third step of combining a plurality of twisted yarn cords to which the adhesive is applied and performing top twisting. The method for manufacturing an extra-thick dip cord according to claim 6 , further comprising a fourth step of combining a plurality of twisted yarn cords obtained in the third step and performing top twisting.

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