JP4425069B2 - Manufacturing method of cord-rubber coating - Google Patents

Description

  The present invention relates to a method of manufacturing a cord-rubber coating material obtained by coating a steel cord with a rubber raw material and useful for manufacturing a steel tire. In particular, the productivity is achieved even when an automated connecting machine is used. The present invention relates to a method for producing a cord-rubber coating material that can be connected well and has excellent handling properties.

A cord-rubber coating that is useful for manufacturing a steel tire is manufactured by drawing a plurality of steel cords from a reel and aligning them, and then coating the cord with rubber using a calendar device or the like. The cord-rubber coating fabric manufactured in this way is cut to a predetermined length and joined to the next process as a tire carcass or belt member.
At this time, if the cut sheet is warped, it is caught on the conveyor belt at the time of transport, and the transportability is hindered. When an automated connecting machine is used, the connection is not successful and the productivity is remarkably deteriorated. Had problems. It has been found that this cord-rubber coating warpage is due to the properties of the steel cord. This warpage is likely to occur when the straightness of the chord is low or when the bends of a plurality of chords are aligned in a certain direction.

As a method of suppressing the occurrence of bending in a certain direction when aligning steel cords, the spool core diameter is increased to φ119 mm or more, the spool upper side unwinding and the lower side unwinding, and There has been proposed a method in which the direction of warping of the cord-rubber coating member is directed downward on the conveyor belt conveyor or a combination thereof is performed (for example, see Patent Document 1).
However, the method of increasing the spool core diameter and the method of directing the warping direction downward on the conveyor belt conveyor require a significant modification of the general-purpose device. In particular, in the latter case, the warping direction is set downward. There is a problem that even if the degree of warping is large, the improvement in connectivity cannot be expected. When placing the spool on the stand, the method of alternating the upper and lower unwinding is greatly Therefore, there is a problem that productivity is reduced because of a large increase in work man-hours.
JP-A-8-13366

  The object of the present invention in consideration of the above problems is to provide a method for producing a cord-rubber coating anti-mold having excellent manufacturability, in which generation of the resulting cord-rubber coating anti-warpage is effectively suppressed in a simple process. It is to provide.

As a result of intensive studies, the present inventors can achieve the above object by dispersing the bending direction of a plurality of steel cords drawn from the stand, suppressing the occurrence of bending in a certain direction, and performing rubber coating. The present invention was completed.
The method of manufacturing a cord-rubber coating composition according to claim 1 includes a step of drawing a plurality of steel cords wound around a plurality of reels to align the cord bending in one direction, and a steel cord in which the bending is aligned in one direction. Part of the cable is bent in the opposite direction to fix the bending direction of the cord once, and the bending direction of the cord is made different from each other, and then the step of fixing all the steel cords in that state and the bending direction of the cord Covering the steel cords fixed in different states with rubber, and pulling out the plurality of steel cords wound around the reels and aligning the bending of the cords in one direction. When placing the steel cord on the table, it is a process of hanging the cord at a length of 50 cm or more from the table. It is set to.

As a more specific aspect of the manufacturing method of the cord-rubber coating composition of the present invention, a step of drawing a plurality of steel cords wound around a plurality of reels to align the cord bending in one direction, and a bending in one direction A step of bending a portion of the steel cord aligned in the opposite direction to temporarily fix the bending direction of the cord, making the bending directions of the cord different from each other, and fixing all the steel cords in that state; And a method of manufacturing a cord-rubber coating material, comprising: a step of coating a steel cord fixed in a state where the bending directions of the cord are different from each other with a rubber.
Here, as a method of aligning the bending of the cord in one direction, when guiding the steel cord pulled out from the stand to the table, unevenness was formed at a constant interval, which is used to keep the cord interval constant. A method of pulling out the length from the support member represented by a comb roll (comb roll) so that the length is 1 m or more, and a method of setting the cord hanging length from the table to 50 cm or more when aligned with the table, If it is a general steel cord under such conditions, the cord bending is aligned downward by its own weight.
The length of the cord hanging from this table is set to 50 cm or more in consideration of the steel cord used for general automobile tires. When this method is applied to other steel cords In consideration of the thickness, rigidity, raw material of the steel cord to be used, and the inclination of the table on which the steel cord is arranged, a length sufficient to form a downward bend due to its own weight may be appropriately selected. .

The method for producing a cord-rubber coating composition according to claim 2 includes: a step of drawing out a plurality of steel cords wound around a plurality of reels in a length in which the cords are not aligned; and a plurality of cord bendings. Including a step of fixing all the steel cords in a state where they are not aligned, and a step of covering the steel cords fixed in a state where the bending direction is not aligned with rubber, and a plurality of windings wound around the plurality of reels. When pulling out the steel cord, the step of pulling out the cord with a length that does not align the bend is the step of placing the steel cord pulled out from the reel on the table so that the hanging length from the table is 10 cm or less. It is characterized by.
Here, in order to fix in a state where a plurality of cord bends are not aligned, the length of the steel cord pulled out from the stand is set to 70 cm or less, or the cord hanging length from the stand is set to 10 cm or less, and in this state The cord may be fixed in a state where it does not bend in one direction due to its own weight, and a rubber coating step may be performed. The drawing length suitable for the conditions at this time and the hanging length from the stand can also be appropriately selected according to the characteristics of the steel cord used as described above.

  According to the production method of the present invention, it is possible to produce a cord-rubber coating fabric excellent in workability, in which the occurrence of warpage is effectively suppressed, with a simple process.

Hereinafter, the present invention will be described in detail.
The manufacturing method of the present invention is characterized in that a part of a plurality of steel cords wound around a plurality of reels are bent differently from other steel cords, aligned in that state, and covered with rubber.
Hereinafter, an embodiment of the method for producing a cord-rubber coating composition of the present invention will be described with reference to the drawings in the order of steps, but the present invention is not limited to this embodiment.
Fig. 1-1 (A) to Fig. 1-2 (G) show that a part of the steel cord is bent differently from the other steel cords by controlling the warping direction of a part of the steel cord drawn from the reel. It is a model figure showing each process of one mode of a manufacturing method.

Here, an example using a general steel cord drawing device will be described. A plurality of steel cords 12A, 12B, 12C and 12D wound around the reel 10 are pulled out from the stand 14, and the adjacent steel cords are alternately passed through the crossbar portions 16A and 16B, and then hung on the comb roll 18 to stand. However, at this time, the length of the drawer from the comb roll 18 (indicated as “← a →” in FIG. 1-1A) is set to 1 m or more, so that a plurality of steel cords 12A, 12B, 12C, and 12D hang down due to their own weight, and the bending direction is aligned downward [FIG. 1-1 (A)]. If this pull-out length is shorter than 1 m, the bending direction tends not to be sufficiently aligned.
The comb roll 18 is a roll for transporting the steel cord with a constant interval between the steel cords by forming the irregularities at regular intervals against the circumference of the cylinder and passing the steel cords through the concave portions. is there.
Moreover, the bending direction can be similarly aligned downward by setting the sag length from the base 20 (indicated by “← b →” in FIG. 1-1A) to 50 cm or more. At this time, if the sag length from the base 20 is shorter than 50 cm, the bending direction tends not to be sufficiently aligned.

Next, the rod 22 is passed through a place where the steel cords 12A, 12B, 12C, and 12D are divided by half by a pair of cross rod portions 16A and 16B, and the rod is moved upward with respect to the steel cord alignment surface. By pushing up, some of the steel cords 12A, 12B, 12C, and 12D (12B and 12D in this case) hung on the adjacent comb roll 18 are shifted upward. [FIG. 1-1 (B)].
Thereafter, a horizontal bar 24 for separating the steel cords is inserted under the steel cords 12B and 12D which are shifted to the upper part of the steel cords hung on the comb roll 18, and parts 12B and 12D of the steel cords are inserted into the horizontal bars 24. It is located on the upper side (FIG. 1-1 (C)).

By moving the horizontal bar as it is, the separated steel cords 12B and 12D are bent upward. Steel cords that are warped upward by being supported by the horizontal bar 24 may be subjected to subsequent processes as they are, but when using a material that is difficult to warp only by bending, such as a highly rigid cord. It is also preferable to carry out a step of fixing for a predetermined time with a magnet 26 [denoted by a wavy line] after bending upward [FIG. 1-1 (D)].
In order to fix the upward bending formed on some of the steel cords 12B and 12D, a pressing plate 28 is installed near the end of the table 20 on the side of the comb roll 18 and the steel cords 12A, 12B, 12C, and 12D. [Fig. 1-2 (E)].
After that, when the steel cords 12B and 12D bent upward are opened, among the steel cords hanging from the base 20, those bent upward 12B and 12D and those hanging downward 12A and 12C have different bending states. [FIG. 1-2 (F)].
Further, all the steel cords 12A, 12B, 12C, and 12D are fixed (temporarily fixed) on the table 20 with the rubber plate 30, and the cords 12A, 12B, 12C, and 12D maintain different bent states [FIG. (G)]. After fixing with the rubber plate 30, the pressing plate 28 is removed. In addition, without using the rubber plate 30 when removing the steel cord, which is partially fixed in a different bent state, in the next step, that is, in the rubber coating step of coating the unvulcanized rubber, Rubber coating can be performed as it is.

Through such a process, the bending direction of the steel cord is alternated up and down, and different bending states are formed. In this embodiment, the bending directions of the steel cords are alternately different directions one by one, but this is not necessarily limited to this, and even if they differ for each predetermined number, they are different from each other in different groups. Although it may have different bending directions, from the viewpoint of the effect, it is preferable that about half of them are different from each other, and that there are alternately different bending states for every few adjacent numbers.
Also, in order to make the bending direction of the steel cord constant, in this aspect, downward bending using its own weight is used, but the process of bending all the steel cords in one direction and bending a part thereof in the opposite direction As long as it has, the bending direction is not particularly limited.

As another aspect in which a part of a plurality of steel cords is bent differently from other steel cords, there is a method in which a random bending direction of a steel cord drawn from a reel is used as it is.
Hereinafter, the second aspect will be described.
In the second aspect, the plurality of steel cords 12A, 12B, 12C, 12D wound around the reel 10 are pulled out from the stand, and the adjacent steel cords are alternately passed through the crossbar portions 16A, 16B, and then the comb roll 18, and the table 20 is aligned with the table 20. At this time, the pull-out length from the comb roll 18 (indicated by “← a →” in FIG. 1-1 (A)) is less than 70 cm, or the table 20 The length of sag from the steel (shown by “← b →” in FIG. 1-1 (A)) is less than 10 cm, thereby suppressing the downward bending due to its own weight, and the steel pulled out from the reel 10 The random bending directions of the codes 12A, 12B, 12C, and 12D themselves are fixed and used as they are.
As a method for fixing the steel cord in the second mode, a method similar to the method using the rubber plate 30 described in FIG. 1-2 (G) of the first mode can be applied.

  In any of the above methods, a part of a plurality of steel cords drawn from a plurality of reels is fixed while being bent differently from the other steel cords, and then covered with a rubber material. The cord-rubber coating fabric obtained in this way can be suitably used for the manufacture of tires and endless belts using an automatic connecting machine and the like, since the occurrence of undesired warpage in one direction is suppressed even when cut.

The rubber coating process for coating the aligned steel cords with unvulcanized rubber can be performed by a conventional method. That is, it is possible to adopt a method in which the steel cords are aligned, the rubber sheet is supplied from above and below, and the steel cord is sandwiched to cover the steel cord.
For example, when manufacturing a cord rubber coating fabric for a tire, it is common to perform a rubber coating process by arranging about 400 to 1000 steel cords.
The type of rubber material used for coating the steel cord, the thickness of the cord-rubber coating, and the like can be arbitrarily selected according to the purpose. The manufacturing process of the cord-rubber coating may include calendering, rubber surface treatment, and the like, if necessary.

There is no restriction | limiting in particular in the steel cord which can apply this invention, If a diameter is about 0.3-5.0 mm, it can apply arbitrarily. In addition, the manufacturing method of the present invention can be applied to any of high rigidity steel cords such as 3 + 9 × φ0.36 and low rigidity steel cords such as 1 × 5 × φ0.225.
In addition, the steel cord is not limited to a monofilament, but it can be wound around a single reel and stored, and if it can be pulled out in the same process, a twisted cord made up of a plurality of steel cords can be used. In such a case, this beat code is applied as a single code.

  According to the method of manufacturing a cord-rubber coating fabric of the present invention, even when a steel cord that has been stored or transported for a long period of time in a state wound on a spool or reel and has reduced straightness is used, the occurrence of warpage is suppressed. The cord-rubber coating is advantageous in that it can be manufactured by a simple process.

EXAMPLES Hereinafter, although an Example is given and this invention is demonstrated in detail, this invention is not restrict | limited to this.
Example 1
A high-rigidity cord (bending stiffness b = 0.140 (b = d ⁴ × n, d: filament diameter (mm), n: number of filaments), diameter: 0.36 mm) was used as the steel cord. Thereafter, according to the steps shown in FIGS. 1-1 (A) to 1-2 (G), 500 high-rigidity cords are pulled out from the reel 10 and passed through the twill bars 16A and 16B. The drawer length was 120 cm, and the hanging length from the table was set to 60 cm. This arrangement produced a downward bend in the cord. Thereafter, half of the cords were shifted upward from the vicinity of the twill rods 16A and 146B through the rods 22 and arranged on the horizontal rods 24. After passing the comb roll 18, only the steel cords on the horizontal rods 24 were bent upward. Since a high-rigidity cord is used here, the upwardly bent cord is attached to the magnet 26 (shown by a wavy line in FIG. 1-1D) for the purpose of surely bending upward. Formed.
After forming an upward bend in half of the steel cords, all the steel cords were fixed with the pressing plate 28, and then the steel cords were fixed with the rubber plate 30 on the table 20, and then the pressing plate 28 was removed.
The steel cord fixed with the rubber plate 30 was coated with a rubber raw material, and the cord-rubber coating fabric of Example 1 was obtained.

(Comparative Example 1)
In Example 1, the pull-out length from the comb roll 18 was 120 cm, and the hanging length from the stand was 60 cm. The cord-rubber coating fabric of Comparative Example 1 was obtained in the same manner as in Example 1 except that the steel cord was fixed on the table 20 with the rubber plate 30 without performing an upward bending process thereafter.

(Example 2)
The same high-rigidity cord as used in Example 1 was pulled out from 500 reels 10, passed through the twill bars 16A and 16B, pulled out from the comb roll 18 by 65 cm, and hung from the base 20 The thickness was set to 5 cm on the table 20. Thereafter, the steel cord was fixed on the table 20 with the rubber plate 30, and rubber coating was performed in the same manner as in Example 1 to obtain the cord-rubber coating fabric of Example 2.

(Example 3)
A low-rigidity cord (bending stiffness b = 0.024, diameter: 0.225 mm) was used as the steel cord. Thereafter, according to the process shown in FIG. 1, 500 low-rigidity cords are pulled out from the reel 10 and passed through the twill bars 16A and 16B. The pull-out length from the comb roll 18 is 120 cm and the hanging length from the table is as follows. The thickness was set to 60 cm on the table 20. Then, half of the cords are shifted upward through the rod 22 from the vicinity of the twill rods 16A and 16B, arranged on the horizontal rod 24 after passing the comb roll 18, and only the steel cord on the horizontal rod 24 is bent upward and held. Formed a bend to.
After forming an upward bend in half of the steel cords, all the steel cords were fixed with the holding plate 28, and then the steel cords were fixed with the rubber plate 30 on the table.
The steel cord fixed with the rubber plate 30 was coated with a rubber raw material in the same manner as in Example 1 to obtain the cord-rubber coating composition of Example 3.

(Comparative Example 2)
In Example 3, the pull-out length from the comb roll 18 was 120 cm, and the hanging length from the stand was 60 cm, which was arranged on the stand. The cord-rubber coating fabric of Comparative Example 2 was obtained in the same manner as in Example 3 except that the steel cord was fixed on the table 20 with the rubber plate 30 without performing the upward bending process thereafter.

[Evaluation of cord-rubber coating anti]
The obtained cord-rubber coating compositions of Examples 1 to 3 and Comparative Examples 1 and 2 were evaluated according to the following criteria.
(Generation of warpage)
The cord-rubber coating was cut into a length of 1000 mm, 10 cut pieces were prepared, and left for 5 minutes. Then, whether or not the corners were warped was visually evaluated.
In each case, no warping was observed, and in each case 1 to 4 were observed, Δ, in which 5 or more warpings were observed, x. The results are shown in Table 1 below.
(Applicability to automatic connection machine)
The work of cutting the cord-rubber coating was cut and connected to both ends of the cut piece by an automatic connecting machine. At that time, it was evaluated whether or not a connection failure due to warping occurred. This continuous operation was continued over the entire length (500 mm) of the steel cord wound on the spool (reel), where no failure occurred during continuous operation, and ○ where one failure occurred. did. The results are shown in Table 1 below.

  From the results shown in Table 1, the cord-rubber coating fabric obtained by the cord-rubber coating fabric manufacturing method of the present invention can be effectively applied to an automatic connecting machine with reduced warpage during cutting. all right. Further, from Examples 1 and 3, it was confirmed that the same effect can be obtained when the manufacturing method of the present invention is applied to either a high-rigidity cord or a low-rigidity cord.

(A) to (D) are each of the first mode in which a part of the steel cord is bent differently from the other steel cords by controlling the warping direction of a part of the steel cord drawn from the reel. It is a model figure which shows the process from the process (A) which forms the downward curve among processes to the process of forming the upward curve to some cords. (E) to (G) are steps subsequent to FIG. 1-1 (D), in which all steel cords having a bend are temporarily fixed with a plate (F). It is a model figure which shows each process to the process (G) fix | immobilized with a rubber plate in the bent state different from the steel cord.

Explanation of symbols

12A, 12B, 12C, 12D Steel cord 18 Comroll 20 Stand 24 Horizontal bar 30 Rubber plate

Claims (2)

Pulling out multiple steel cords wound around multiple reels and aligning the cord bending in one direction,
A part of the steel cord with the bend aligned in one direction is bent in the opposite direction to temporarily fix the bend direction of the cord so that the bend directions of the cord are different from each other, and then all the steel cords are fixed in that state And a process of
The steel cord bending direction is fixed in different states of the code, a step of covering with rubber, only including,
The step of pulling out a plurality of steel cords wound around the plurality of reels and aligning the bending of the cords in one direction is such that when placing the steel cords pulled out from the reels on a table, the steel cords are hung by a length of 50 cm or more from the table. A method for producing a cord-rubber coating composition , which is a step of arranging . When drawing out a plurality of steel cords wound around a plurality of reels, a step of drawing out with a length that does not align the cord bending;
Fixing all the steel cords in a state where a plurality of cord bends are not aligned,
Covering the steel cord fixed in a state in which the bending direction is not aligned with rubber ,
When pulling out a plurality of steel cords wound around the plurality of reels, the step of pulling out the cords with a length that does not align the bending of the steel cords, when placing the steel cords pulled out from the reels on the table, the hanging length from the table Is a step of disposing as 10 cm or less .

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