JP3402395B2 - Steel cord alignment device and method for manufacturing radial tire treat using the same - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flat steel cord aligning apparatus for producing a pneumatic tire and a method for producing a treat for a radial tire using the same.

[0002]

2. Description of the Related Art A steel cord having a single-twisted or multi-twisted structure made of steel filaments having the same diameter and having a cross section orthogonal to the longitudinal direction of the cord is elliptical or oval is called a flat steel cord. A treat is one in which a plurality of steel cords are passed through the rolls of a calender device and coated with rubber from above and below. In addition, a single-layer structure cord made of a plurality of filaments in a single twisting process is a single-strand structure cord, and a multi-layer structure cord made of a plurality of filaments in a plurality of twisting processes is used for each layer. It is called a twisted structure cord. Then, for example, a flat steel cord having a 1 × 3 twist structure composed of three steel filaments and having an elliptical or oval cross-sectional shape orthogonal to the longitudinal direction,
As a method of manufacturing a treat by coating rubber from above and below through a roll of a calender device, a press roll which is the device according to claim 1 is used as a device for aligning steel cords, or the device according to claim 2. I was using a comb roll. When a press roll is used, the cross-sectional shape of the plurality of annular grooves formed at equal intervals in the axial direction on the surface of the press roll was a semicircular groove that is the lower half of a circle, a V-shaped V groove, or the like. . Further, when a comb roll is used, the cross-sectional shape of the plurality of annular grooves formed at equal intervals in the axial direction on the surface of the comb roll is a concave groove having a bottom and both side surfaces formed in a straight line.

[0003]

When a flat steel cord-containing treat having, for example, a 1 × 3 twist structure is manufactured by using the press roll or the comb roll having the annular groove having such a cross-sectional shape, the flattened steel cord is produced. The cross section orthogonal to the longitudinal direction of the steel cord (hereinafter referred to as the steel cord cross section) is oval or oval, so the direction of the cross section of these flat steel cords is constant with respect to the width direction of the treat. However, for example, the direction of the major axis of these elliptical or oval cross sections becomes horizontal,
It may be vertical or slanted. As described above, when the surface is vertical or slanted, there is a portion where the distance from the surface of the steel cord to the outer surface of the rubber in the treat thickness direction becomes small. When the distance is reduced, when the tires are made by stacking the treats, the adhesion performance may be deteriorated and peeling may occur. On the other hand, if the thickness of the treat is increased to prevent this, the rolling resistance of the tire increases due to the increase in the weight of the tire using the treat, and the high-speed durability decreases, and further, the material cost increases. There's a problem. Therefore, in order to eliminate these problems, use a flat steel cord with an oval or elliptical steel cord cross section to reduce the thickness of the treat as much as possible, and make the long diameter wire of the flat steel cord cross section It must be parallel to the width direction of the treat. Therefore, an object of the present invention is to solve these problems, and a steel cord having a single twist structure or a double twist structure composed of n filaments has an elliptical or elliptical cross section, and its long diameter line corresponds to the width direction of the treat. It is an object of the present invention to provide a steel cord aligning device for aligning in parallel and a method for manufacturing a radial tire treat using this device.

[0004]

In order to solve such a problem, the invention according to claim 1 is to provide a plurality of steel cords on the inlet side of a calendar device for coating rubber on a steel cord. A press roll having annular grooves formed at equal intervals in the axial direction is arranged, and a plurality of steel cords are passed through the plurality of annular grooves, so that the intervals of the steel cords are uniformly aligned, in a steel cord aligning device, The steel cord has a single-twisted or multi-twisted structure with filaments of the same diameter, and the cross section of the cord is elliptical or oval, and the cross-sectional shape of the annular groove is substantially the same as that of the steel cord. Alternatively, it can be achieved by forming a shape surrounded by a substantially lower half of the ellipse and a long diameter line substantially parallel to the axis of the press roll. Further, as an invention according to claim 2, a plurality of comb rolls having a plurality of annular grooves formed at equal intervals in the axial direction on the surface of the calender device for coating the steel cord with rubber are arranged on the inlet side of the calender device. In a steel cord aligning device in which steel cords are passed through the plurality of annular grooves so that the intervals of the steel cords are aligned uniformly, the steel cords have a single-twisted or multi-twisted structure with filaments having the same diameter. , The cross section of the cord is elliptical or oval, and the cross-sectional shape of the base of the annular groove is substantially the same as the cross section of the steel cord, approximately the lower half of the ellipse or oval, and substantially parallel to the axis of the comb roll. This can be achieved by forming a shape surrounded by the long diameter line.
As a method for manufacturing a treat for radial tires, a steel cord aligning device according to claim 1 or 2 is used, and a single-twisted or multi-twisted structure with filaments of the same diameter is used, and the cross section of the cord is elliptical. Or, by arranging an oval steel cord so that the major axis line of the cross section of the cord is parallel to the axis of the roll of the calender device, and then coating the steel cord between the rolls of the calender device with rubber. Can be achieved by

[0005]

The operation of the invention described in claim 1 will be described.
Now, with the thin coating rubber being rolled on the surfaces of both the upper and lower rolls of the calender device, the calender device rolls are rotating in opposite directions at the upper and lower parallel positions. At the entrance of the calender device, make its own axis of rotation parallel to the axis of rotation of the calender device roll, and
A press roll having a plurality of annular grooves formed on its surface at equal intervals in the axial direction is arranged.By passing a plurality of steel cords through the plurality of annular grooves, the intervals of the steel cords can be uniformly aligned. After that, when the steel cord passes between the upper and lower rolls of the calendar device,
It is assumed that the thin coating rubber is pressure-bonded to the upper and lower surfaces of the flat steel cord and rubbed therein to form a treat for a radial tire. At this time, the press roll is arranged in such a position as to press the steel cord from above so that the flat steel cord flowing in the horizontal direction is wound around the press roll in an arc shape and flows. Further, the cross-sectional shape of the annular groove formed on the surface of the press roll is surrounded by a substantially lower half of an ellipse or an ellipse substantially equal to the cross section of the steel cord and a long diameter line substantially parallel to the axis of the press roll. It is designed to be Since a tensile force is applied to these steel cords, the steel cords are always directed toward the radial axis of the press roll while the steel cords are wound around the plurality of annular grooves of the press roll while being wound around the arc roll at a certain angle. The steel cord receives a pressing force. Therefore, these flat steel cords are pressed without a gap in the direction of the bottom of the annular groove of the press roll. Then, the direction of the cross-sectional shape of the steel cord rotating together with the press roll while being pressed, without a gap in the bottom direction of the annular groove of the press roll,
The cross-sectional shape of the annular groove of the press roll is adapted. Thus, a steel cord having a single-twisted or multi-twisted structure with filaments of the same diameter, the cross section of the cord being elliptical or oval, and the long diameter line of the cross section of the cord being the axis of the calender roll. Can be aligned so that they are parallel.

Next, the operation of the invention described in claim 2 will be described. Now, with the thin coating rubber being rolled on the surfaces of both the upper and lower rolls of the calender device, the calender device rolls are rotating in opposite directions at the upper and lower parallel positions. At the entrance of the calender device, a comb roll in which a plurality of annular grooves are formed at equal intervals in the axial direction on the surface of the roller in parallel with the roll, and a plurality of flat steel cords are passed through the plurality of annular grooves. Then, after making the intervals of the steel cords uniform, when the flat steel cords pass between the upper and lower rolls of the calender device, the thin coating rubber is pressed and rubbed against the upper and lower surfaces of the flat steel cords. It is assumed that a radial tire treat is made. At this time, the comb roll is arranged at a position where the flat steel cord flowing in the horizontal direction is slightly pushed up from below. Further, the cross-sectional shape of the bottom side of the annular groove formed on the surface of the comb roll is substantially the same as the cross section of the flat steel cord, that is, the lower half of an ellipse or an ellipse, and the long diameter line substantially parallel to the axis of the press roll. The shape is surrounded by and. Since a tensile force is applied to these flat steel cords, the flat steel cords are formed on the bottoms of the plurality of annular grooves of the comb roll while the flat steel cords flow while contacting the bottoms of the plurality of annular grooves of the comb roll. The flat steel cord is moved in the same direction as the cross-sectional shape, and the cross-sectional shape of the flat steel cord is aligned. In this way, a steel cord having a single-twisted or multi-twisted structure with filaments of the same diameter, the cord having an elliptical or oval cross-section, and the long-diameter line of the cross-section of the cord is the roll of the calender device. It can be aligned parallel to the axis.

Next, the operation of the invention described in claim 3 will be described. As described above, when the steel cord aligning device according to claim 1 or 2 is used, it has a single twist structure or a double twist structure with filaments having the same diameter, and the cross section of the cord is elliptical or oval. The flat steel cord having the above shape can be aligned such that the long diameter line of the cross section of the cord is parallel to the axis of the roll of the calender device. Therefore, the steel cord is then passed between the upper and lower rolls of the calender device, and the thin coating rubber is pressed against the upper and lower surfaces of the steel cord and rubbed, whereby the flat steel cord has an elliptical or oval cross section. It is possible to manufacture a treat for a radial tire in which the major axis line of is parallel to the width direction of the treat. With such a manufacturing method, a thin treat can be produced without causing a problem of peeling without deteriorating the adhesive performance. Therefore, it is possible to reduce the weight of the tire and reduce the rolling resistance. Can be done.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. First, an embodiment of the invention according to claim 1 will be described with reference to FIGS. In FIG. 1, reference numeral 1 is a calendering device for coating a plurality of flat steel cords 10 with rubber, and the calendering device 1 is mainly composed of I roll 2, II roll 3, III roll 4 and IV roll 5. ing. All of these rolls are provided with their respective rotation axes (not shown) in parallel, and are adapted to rotate in the direction of the arrow in FIG. As shown in FIG. 1, the flat steel cord 10 has an inlet 6 for the calender device 1.
The upper coating rubber 7 rolled into a thin sheet rubber by the I roll 2 and the II roll 3 when passing between the upper and lower rolls composed of the II roll 3 and the III roll 4, and the III roll. A roll 4 and an IV roll 5 are used to press a lower coating rubber 8 rolled into a thin sheet-like rubber from above and below to be rubbed and rubbed into a radial tire treat 11.

A press roll 9 as an aligning device for aligning a plurality of flat steel cords 10 at equal intervals in the width direction is provided on the front side of the III roll 4 below the inlet 6 of the calender device 1. A plurality of flat steel cords 10 are arranged so as to be pressed against the surface of the III roll 4 from above. This press roll 9 does not have a rotational driving force by itself, but the shaft ends 19 on both sides shown in FIG.
While being supported by a rotary bearing (not shown), 19 is brought into contact with and separated from the surface of the III roll 4 by a known cylinder (not shown) or the like. When it is pressed against the surface of the III roll 4 as described above, it rotates in the opposite direction to the III roll 4. Therefore, the plurality of flat steel cords 10 enter the annular groove 17 of the press roll 9 and are in contact with each other. It is arranged on the lower coating rubber 8 on the surface of the roll 4 and advances as the III roll 4 rotates. Further, as shown in FIG. 2, a plurality of annular grooves 17 are formed at equal intervals on the surface of the body 18 of the press roll 9 shown in FIG. 2 in a direction orthogonal to the axis of the press roll 9. Each of the plurality of flat steel cords 10 enters along each of the plurality of annular grooves 17 and flows while being aligned.

Here, as shown in FIG. 5, the cross section of the flat steel cord 10 is, for example, a single twist structure of 1 × 3.
Explaining the twisted structure as an example, this flat steel cord 1
The filament 13 forming 0 is arranged so as to be inscribed in an ellipse or an ellipse which is the sectional shape 14 of the flat steel cord 10. The reference numeral 21 indicated by a chain double-dashed line indicates a long diameter line. In this way, there is a space between the filaments 13 and the steel cord 10 in which the cross-sectional shape 14 is elliptically or oval and twisted is called an open-twisted flat steel cord.

The sectional shape of the annular groove 17 is a shape surrounded by a substantially lower half of an ellipse or an ellipse substantially equal to the section of the flat steel cord 10 and a long diameter line substantially parallel to the axis of the press roll 9. FIG. 3 which is an enlarged view. Therefore, when a flat steel cord having a different size from the flat steel cord 10 is used to produce a treat, the press roll is replaced with a press roll suitable for the treat. As a specific example, in FIG. 5, the length a of the long axis of the cross section of the steel cord 10 is 0.9.
6 mm and the length b of the minor axis is 0.67 mm, in FIG. 3, the dimensions of the cross-sectional shape of the annular groove of the press roll are groove width c = 1.03 mm and the radius R1 = 0.
75 mm, radius R2 of the circular arc on the side of the groove R2 = 0.
28mm, length of arc chord by R1 d = 0.77m
Let m and e = 0.13. At this time, the sectional shape of the annular groove 17 of the press roll 9 may be an approximate groove as shown in FIG. That is, in FIG. 4, the groove width f = 1.
00 mm, radius of arc of groove lower part R3 = 0.75 mm, R
The length g of the arc chord according to 3 = 0.75 mm, the depth k of the groove
= 0.55 mm.

Next, the operation of the above embodiment will be described. Now, as shown in FIG. 1, a plurality of flat steel cords 10
However, it is assumed that the current flows into the annular groove 17 of the press roll 9 as an aligning device provided in the lower part of the inlet 6 of the calender device 1 while being in contact with the circular groove 17 and wound around 90 ° at an arc angle. Since a certain amount of tensile force is applied to the plurality of flat steel cords 10 in the longitudinal direction of the plurality of flat steel cords 10 so as to maintain linearity and prevent the flat steel cords 10 from moving too much, the plurality of flat steel cords 10 are While flowing around the press roll 9 at an angle of an arc of about 90 °, the tensile force acts toward the radial axis of the press roll 9. Therefore, the cross-sections of the plurality of flat steel cords 10 are pressed against the cross-sectional shape of the annular groove 17 formed in the press roll 9.

The sectional shape of the annular groove 17 formed in the press roll 9 is the flat steel cord 1 described above.
The flat steel cords 10 have a shape surrounded by an ellipse or a substantially lower half of an ellipse substantially equal to the cross section of 0 and a long diameter line substantially parallel to the axis of the press roll 9. 9 arc angle of about 90 °
During the winding and rotation, the direction of the sectional shape of the steel cord 10 moves in an attempt to be stable in conformity with the direction of the sectional shape of the annular groove 17 formed in the press roll 9. As a result, when the plurality of flat steel cords 10 wind around the press roll 9 at an angle of an arc of about 90 ° and flow and then leave the press roll 9, the directions of both cross-sectional shapes match. That is, the cross-sections of the plurality of flat steel cords 10 are elliptical or oval, and their long diameter lines 21 are parallel to the axis of the press roll 9.

Next, an embodiment of the invention according to claim 2 will be described with reference to FIGS. 7, 8 and 9 to 10. In the present embodiment, a comb roll 12 as an aligning device for aligning a plurality of steel cords 10 at equal intervals in the width direction,
A shaft end portion 20 (FIG. 8) is rotatably supported at a position such that the steel cord 10 is slightly pushed up from the lower side of the steel cord 10 near the inlet 6 of the calendar device 1. There is. On the surface of the body portion 15 of the comb roll 12, a plurality of annular grooves 16 are formed at equal intervals in a direction orthogonal to the axis of the comb roll 12 as shown in FIG. Each of the plurality of flat steel cords 10 enters along each of the plurality of annular grooves 16 and flows while being aligned. Therefore,
The comb roll 12 is not driven by itself, but is rotated by the contact resistance with the flowing flat steel cords 10. After passing through the comb roll 12, the plurality of flat steel cords 10 are
The calender device 1 is designed to move between upper and lower rolls composed of II roll 3 and III roll 4.

The cross-sectional shape of the bottom of the annular groove 16 is surrounded by a substantially lower half of an ellipse or an ellipse substantially equal to the cross section of the flat steel cord 10 and a long diameter line substantially parallel to the axis of the comb roll 12. It is shaped. Both side surfaces of the groove are vertical straight lines orthogonal to the axis of the comb roll 12 and are as shown in FIG. 9 which is an enlarged view.
Therefore, when a flat steel cord having a size different from that of the flat steel cord 10 is used to produce a treat, the comb roll is replaced with a suitable comb roll. As one specific example, in FIG. 5, when the length a of the major axis of the cross section of the steel cord 10 is 0.96 mm and the length b of the minor axis is 0.67 mm in FIG. The cross-sectional shape of the bottom of the groove has a groove width y = 1.03 mm,
The radius R4 of the arc of the groove lower part is R5 = 0.75 mm, the radius R5 of the arc on the side of the groove continuing to this is R5 = 0.28 mm, and the chord length of the arc R4 is m = 0.77 mm, n = 0.13. .
At this time, the cross-sectional shape of the bottom side of the annular groove 16 of the comb roll 12 may be an approximate groove as shown in FIG. That is, in FIG. 10, the groove width p = 1.00 mm, the arc radius R6 = 0.75 mm of the groove lower part, the chord length q = 0.75 mm of the arc of R6, and the groove depth r = 0.55 mm. ，
May be

Next, the operation of the above embodiment will be described. Now, as shown in FIG. 7, a plurality of flat steel cords 10
Enters the annular groove 16 of the comb roll 12 as an aligning device provided near the inlet 6 of the calendar device 1 and is slightly pushed upward from the lower side by the comb roll 12 to make a loose chevron contact. It is flowing. Since a certain amount of tensile force is applied to the plurality of flat steel cords 10 in the longitudinal direction of the plurality of flat steel cords 10 so as to maintain linearity and prevent the flat steel cords 10 from moving too much, the plurality of flat steel cords 10 are The tensile force acts toward the radial axis of the comb roll 12 while flowing in the comb roll 12 in a state of being in a loose chevron shape. Therefore, the cross-sections of the plurality of flat steel cords 10 are pressed against the cross-sectional shape of the bottom side of the annular groove 16 formed in the comb roll 12.

Here, the cross-sectional shape of the bottom of the annular groove 16 formed in the comb roll 12 is substantially the same as the cross section of the flat steel cord 10 and the lower half of an ellipse or an ellipse. Since the flat steel cords 10 are surrounded by a long diameter line substantially parallel to the axis, the flat steel cords 10 flow while the plural flat steel cords 10 are flowing in the comb roll 12 in a loose chevron shape.
The direction of the cross-sectional shape of is aligned with the direction of the cross-sectional shape of the bottom of the annular groove 16 formed in the comb roll 12, and moves in an attempt to stabilize. As a result, the plurality of flat steel cords 10
However, when the comb roll 12 is separated from the comb roll 12 after flowing in a state where the comb roll 12 is loosely contacted with the comb roll 12, the directions of both cross-sectional shapes are matched. That is, the cross-sections of the plurality of flat steel cords 10 are elliptical or oval, and their long diameter lines 21 are parallel to the axis of the comb roll 12.

Next, an embodiment of the invention described in claim 3 will be described with reference to the drawings. Here, first, a method for manufacturing the radial tire treat 11 using the press roll 9 as the aligning apparatus according to claim 1 will be described with reference to FIG. As described in the embodiment of the invention according to claim 1, the plurality of flat steel cords 10 are provided on the side of the III roll 4 below the inlet 6 of the calender device 1 from the top to the surface of the III roll 4. A plurality of flat steel cords 1 are pressed by the press rolls 9 arranged in parallel with the rolls of the calendar device 1 so as to be pressed against the flat steel cords 1.
The cross section of 0 has an elliptical or oval shape and has a long diameter line 21.
Are aligned parallel to the axis of the press roll 9. And
A plurality of flat steel cords 10 arranged as described above
When leaving the press roll 9, as shown in FIG.
Since the pressing roll 9 presses the lower coating rubber 8 on the surface of the III roll 4, the flat steel cords 10 are maintained in the aligned state as described above, and the III roll 4 rotates as the III roll 4 rotates. Go, II roll 3
The upper coating rubber 7 rolled into a thin sheet rubber by the I roll 2 and the II roll 3 when passing between the upper and lower rolls constituted by the III roll and the III roll, and the III roll.
A roll 4 and an IV roll 5 are used to press a lower coating rubber 8 rolled into a thin sheet-like rubber from above and below to be rubbed and rubbed into a radial tire treat 11. Therefore, in the radial tire treat 11 manufactured by such a method, as shown in FIG. 6, the long diameter lines 21 of the cross section of the plurality of flat steel cords 10 are arranged in parallel with the width direction of the treat. Become.

Next, the treat 11 for a radial tire is prepared by using the comb roll 12 as the aligning device according to the second aspect.
A method for manufacturing the above will be described with reference to FIG. As described in the embodiment of the invention according to claim 2, the plurality of flat steel cords 10 are provided in the annular groove 16 of the comb roll 12 provided in the vicinity of the inlet 6 of the calender roll in parallel with the calender roll. By entering and being pushed up a little from the lower side to the upper side by the comb roll 12 and flowing in a state of being in contact with a loose chevron, the cross sections of the plurality of flat steel cords 10 are elliptical or oval and their long diameter lines 21 are formed. It is aligned parallel to the axis of the comb roll 12. Then, when the plurality of flat steel cords 10 thus aligned pass between the upper and lower rolls composed of the II roll 3 and the III roll 4, the I roll 2 and the II roll 3
And the upper coating rubber 7 rolled into a thin sheet-like rubber with and the lower coating rubber 8 rolled into a thin sheet-like rubber with the III roll 4 and the IV roll 5 from above and below are rubbed against each other by rubbing. It becomes the treat 11 for radial tires.

Therefore, as shown in FIG. 6, the radial tire treat 11 manufactured by such a method has a long diameter line 21 in the cross section of a plurality of flat steel cords 10.
Are aligned parallel to the width direction of the treat. This makes it possible to manufacture the radial tire treat 11 having a small thickness. Similarly, as an example of double twist,
As shown in FIG. 11, a flat layer having a two-layer structure in which six filaments 31 are twisted in the opposite direction to the first layer as a second layer around a core (first layer) in which two filaments 30 are twisted. Even when a treat for a radial tire is manufactured using the steel cord 32, a long diameter line of a cross section of the plurality of flat steel cords 32 is similarly obtained in which the long diameter lines are aligned parallel to the width direction of the treat. Similarly, as another example of multi-twisting, one filament 35 forming a core as shown in FIG. 12 is used.
In addition, a flat steel cord 37 of a two-layer structure in which six filaments 36 are twisted as a second layer is used around it by adding a habit called a crimp undulating in a two-dimensional sine curve shape. Even if the treat for radial tires is manufactured in the same manner, the long-diameter line of the cross section of the plurality of flat steel cords 37 is similarly obtained in parallel with the width direction of the treat. This makes it possible to manufacture radial tire treats with a small thickness.By making tires using such treats, the tire weight is reduced, rolling resistance is reduced, and fuel consumption is improved. Can be planned.

[0021]

As described above, according to the aligning device of the present invention, a plurality of flat steel cords can be aligned efficiently and reliably near the entrance of the calender device. Further, according to the method for manufacturing a radial tire treat using the apparatus, a complicated apparatus is used for the radial tire treat in which the long diameter lines of the cross sections of the plurality of flat steel cords are parallel to the width direction of the treat. Can be manufactured by a relatively simple method without. Moreover, the tire performance can be significantly improved by using this treat without lowering the work efficiency.

[Brief description of drawings]

FIG. 1 is an overall side view (cross-sectional view) according to the present invention.

FIG. 2 is an overall view of an alignment device according to claim 1 of the present invention.

FIG. 3 is a partially enlarged view of FIG.

4 is a diagram of another embodiment of FIG.

FIG. 5 is a cross-sectional view of a single twist steel cord according to the present invention.

FIG. 6 is a cross-sectional view in the width direction of the treat according to the present invention.

FIG. 7 is an overall side view (cross-sectional view) according to the present invention.

FIG. 8 is an overall view of an alignment apparatus according to claim 2 of the present invention.

9 is a partially enlarged view of FIG.

10 is a diagram of another embodiment of FIG. 9. FIG.

FIG. 11 is a cross-sectional view of a multi-twisted steel cord according to the present invention.

FIG. 12 is a cross-sectional view of another example of the multi-twisted steel cord according to the present invention.

[Explanation of symbols]

1: Calender device 2: I roll 3: II roll 4: III roll 5: IV roll 6: Inlet (of calender device) 7: Upper coating rubber 8: Lower coating rubber 9: Press roll 10 (as aligning device) : Steel cord (of single twist structure) 11: Treat 12: Comb roll (as aligning device) 13: Filament 14: Cross-sectional shape 15: Body part 16: Annular groove 17: Annular groove 18: Body part 19: Shaft end part 20: Shaft end 21: Long diameter wire 30: (First layer) filament 31: (Second layer) filament 32: Steel cord 35 (of double twist structure) 35: (First layer) filament 36: (2) Layer 37 Filament 37: Steel cord (of double twist structure) R1, R2, R3, R4, R5, R6: Radius a: Major axis b: Minor axis c: Groove width
d; string length f: groove width g: string length k: groove depth
m: string length p: groove width q: string length r: groove depth

Front page continued (58) Fields surveyed (Int.Cl. ⁷ , DB name) B29D 30/38 B29C 70/20 D07B 1/06 B60C 9/00

Claims (3)

(57) [Claims] 1. A press roll having a plurality of annular grooves formed on its surface at equal intervals in the axial direction is disposed on the inlet side of a calendering device for coating a steel cord with rubber. In a steel cord aligning device that allows the intervals of the steel cords to be uniformly aligned by passing through a plurality of annular grooves, the steel cord is a single-twisted or multi-twisted structure with filaments of the same diameter, A cross section orthogonal to the longitudinal direction has an elliptical shape or an oval shape, and a cross-sectional shape of the annular groove is substantially the same as a cross section of the steel cord and an approximately lower half of an ellipse or an oval, and substantially parallel to the axis of the press roll. A steel cord aligning device characterized by being surrounded by a long-diameter wire. 2. A comb roll having a plurality of annular grooves formed on its surface at equal intervals in the axial direction is arranged on the inlet side of a calendering device for coating a steel cord with rubber, and the plurality of steel cords are provided as described above. In a steel cord aligning device adapted to uniformly align the intervals of the steel cords by passing through a plurality of annular grooves, the steel cords have a single-twisted structure or a multi-twisted structure of filaments having the same diameter. A cross section orthogonal to the longitudinal direction has an elliptical shape or an oval shape, and the cross-sectional shape of the bottom side of the annular groove is substantially the same as the cross section of the steel cord. A steel cord aligning device characterized by being shaped so as to be surrounded by parallel long diameter lines. 3. A steel cord aligning device according to claim 1 or 2, wherein the steel cord aligning device has a single-twisted or multi-twisted structure with filaments of the same diameter, and the cross section orthogonal to the longitudinal direction of the cord is elliptical. Or, by arranging an oval steel cord so that the major axis line of the cross section of the cord is parallel to the axis of the roll of the calendering device, the steel cord is coated with rubber between the rolls of the calendering device. A method for producing a treat for a radial tire, characterized in that