JP2006007428A - Rubber sheet manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for manufacturing a rubber sheet with good workability while suppressing the fly-out of steel wires from a comb tooth roll. <P>SOLUTION: In the method for manufacturing the rubber sheet 26 by bundling a plurality of steel wires 12 to arrange them to a guide plate 20 and guiding the arranged steel wires to the comb tooth roll 22 to apply calender processing to them, at least a part of a plurality of the steel wires 12 is twisted on the end part side thereof before guided to the comb tooth roll 22. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a method for manufacturing a rubber sheet, and more particularly, to a method for manufacturing a rubber sheet by bundling a plurality of steel wires and aligning them on a guide plate, and then guiding them to a comb tooth roll, followed by calendaring.

In recent years, pneumatic radial tires, especially passenger car tires, are required to have low rolling resistance, good riding comfort, and low cost in order to improve the fuel efficiency of automobiles. As an improvement, a structure in which twisted steel cords are simplified and steel wires are arranged in parallel bundles has been proposed. For example, Patent Documents 1 and 2 disclose that a metal wire is embedded in rubber in units of bundles arranged and aligned in the belt width direction without twisting. It is described that in the tire having the untwisted steel cord thus obtained, rolling resistance and riding comfort are improved.
Also, for rubber sheets with untwisted steel cords, generally, spools are arranged in a number corresponding to the required number of placements on the rubber sheet, and the steel wires wound around the spools are drawn out from a predetermined number of spools and aligned. After bundling, it is introduced into the guide plate. Next, after the steel wire bundle introduced into the guide plate is guided to the comb-teeth roll, it is manufactured by rolling and coalescing with the separately introduced rubber sheet in a calendar. For example, Patent Document 3 discloses a technique in which a plurality of wire rods are wound around a spool and a plurality of wire rods are simultaneously sent from each spool to a guide plate. There are advantages such that the introduction angle of the wire can be reduced, and the wire aligning operation can be facilitated.
JP-A-5-5290 Japanese Patent Laid-Open No. 11-208210 JP-A-5-278146

  However, in such a method for manufacturing a rubber sheet, since a bundle of steel wires is guided to each of the comb-teeth rolls and then sent to the calendar, a plurality of steel wires are set to the comb-teeth roll in units of bundles. At this time, a bundle of steel wires once set or a part of the steel wires in a bundle may jump out of the comb tooth roll. In this case, the steel wire must be reset and workability is impaired. In particular, a cord composed of a plurality of steel wires has appropriate flexibility, whereas a steel wire alone does not have such flexibility and is light, and therefore easily protrudes from a comb-tooth roll. Further, when the steel wire that has jumped out is set again, it is difficult to distinguish from the steel wires constituting the other bundles, which increases the complexity and significantly lowers the work efficiency.

  Accordingly, an object of the present invention is to provide a rubber sheet manufacturing method that suppresses the jumping of the steel wire from the comb tooth roll and manufactures the rubber sheet with good workability.

The method for producing a rubber sheet of the present invention is a method for producing a rubber sheet by bundling a plurality of steel wires and aligning them on a guide plate and then conducting a calendering treatment after guiding them to a comb tooth roll. Before the steel wire is guided to the comb-teeth roll, twisting is performed on at least a part of the ends of the plurality of steel wires.
According to this rubber sheet manufacturing method, since twisting is performed on at least a part of the end side of the steel wire before guiding it to the comb-teeth roll, a bundle of wrinkles is added to increase flexibility, and a light steel wire single wire Unlike the case of handling in, it becomes heavy. For this reason, by setting it as such a steel wire bundle, when setting to a comb-tooth roll, the individual steel wire which comprises a steel wire bundle does not jump out of a steel wire bundle.
Here, it is preferable that the plurality of steel wires that are not twisted and in a wound state are drawn out and twisted, and in this case, two to six steel wires are one wound member. It is particularly preferable that the wire is wound around.
Moreover, it is preferable to twist together with respect to at least one part by the side of the edge part of 2-6 steel wires.
In addition, it is preferable that at least one part by the side of the edge part of the steel wire which twists together is 30-200 cm in length.

  According to the present invention, twisting is performed on at least a part of the ends of the plurality of steel wires before being guided to the comb-teeth roll, so that the individual steel wires constituting the steel wire bundle or bundle are Jumping out from the comb-tooth roll can be easily suppressed. Thereby, a rubber sheet can be manufactured with good workability.

[First Embodiment]
The first embodiment of the present invention will be described in detail below.
FIG. 1 shows a rubber sheet manufacturing apparatus 10. The rubber sheet manufacturing apparatus 10 includes a plurality of spools 16 (corresponding to winding means of the present invention) around which steel wires 12 are wound, and a calendar 18 into which the steel wires 12 drawn from the spool 16 are fed. The steel wire 12 can be moved from the spool 16 to the calendar 18 with a constant tension by a drawing device (not shown) (from left to right in FIG. 1).

A single steel wire 12 is wound around each spool 16. The spool 16 is not limited to this as long as the steel wire 12 can be wound.
The steel wire 12 is not particularly limited as long as it is used for embedding in a rubber sheet. For example, the steel wire 12 is subjected to a heat treatment, and a brass-plated steel wire is passed through a plurality of drawing dies and subjected to wet wire drawing. The steel wire is drawn to have a wire diameter of 0.15 to 0.40 mm.
The steel wire 12 used here may be any steel wire that is usually used for a rubber sheet. However, in order to obtain a certain degree of strength, the carbon content may be 0.6 to 1.2%. preferable. If it is 0.6% or more, an appropriate strength can be secured, and if it is 1.2% or less, an appropriate metal structure can be obtained in the heat treatment process, and there is no disconnection during wire drawing. Does not hinder production. In addition, the measurement of the carbon content of the steel wire 12 may be performed by a measurement method used for this application, and examples thereof include a measurement method using a LECO company CS-400 type carbon-sulfur simultaneous analyzer. .

  The steel wires 12 are bundled as described later to form a steel wire bundle 14. The number of steel wires 12 to be bundled is appropriately determined according to the intended use of the rubber sheet 26, but is preferably 2 to 6 from the viewpoint of tire performance.

Between the spool 16 and the calendar 18, a guide plate 20 and a comb roll 22 are arranged in parallel in this order from the upstream side in the moving direction of the steel wire 12. The guide plate 20 is provided with position fixing portions (not shown) such as a plurality of holes for aligning and bundling a predetermined number (three in FIG. 1) of steel wires 12 into a bundle. ing. The comb-tooth roll 22 is formed with a plurality of teeth 24 for arranging the individual steel wire bundles 14 at predetermined intervals in a direction perpendicular to the moving direction of the steel wires 12.
A rubber material (not shown) can be introduced into the calendar 18, and a rolling means for forming a rubber sheet 26 by rolling a combination of a plurality of steel wire bundles 14 and a rubber material that are aligned in parallel. Is provided.

The upstream side of the guide plate 20 of the rubber sheet manufacturing apparatus 10 can be twisted with respect to a twisted portion of the steel wire bundle 14 (corresponding to at least part of the end side of the steel wire in the present invention). A twisting device 30 is provided.
The twisting device 30 has a fixing portion 32 and a twisting portion 34 for applying twist to the steel wire bundle.
The fixing portion 32 may be any means as long as the steel wire bundle 14 can be fixed by bundling and fixing the steel wire 12 to such an extent that a torque caused by twisting is not applied to the steel wire 12. Good.
The twisted portion 34 grips the other side of the steel wire bundle 14 partially fixed by the fixing portion 32 and rotates to one side and the other by driving a power unit (not shown) to apply a certain twist to the steel wire bundle 14. Any means can be used as long as it is possible.

The twisting device 30 is provided with a moving member (not shown) that can change the relative distance between the fixed portion 32 and the twisted portion 34. The distance L between the fixed portion 32 and the twisted portion 34 is appropriately set according to the length m of the twisted portion of the steel wire bundle 14.
The twisted portion of the steel wire bundle 14 is a portion where twisting is performed by the twisting device 30, and corresponds to a length m portion from the end of the steel wire 12 to the fixing portion 32. This twisted portion has an appropriate length from the viewpoint of preventing the steel wire bundle 14 from falling off when the steel wire bundle 14 is set on the guide plate 20, and has a sufficient effect of suppressing the deviation of the steel wire bundle 14 when set on the comb-tooth roll 22. As a length that is not too short to be able to be secured and is not so long as to prevent the working efficiency from being lowered, it is preferably 30 cm to 200 cm, more preferably 50 cm to 150 cm.

  However, the twisted portion preferably includes the tip of the steel wire 12 from the viewpoint of preventing the steel wire bundle 14 from falling off. However, from the viewpoint of work efficiency, the twisted portion 34 is substantially based on the position. It may also include a tip portion of the steel wire 12 that is not stranded. The length of the untwisted tip portion of the steel wire 12 is preferably within 5 cm from the tip of the steel wire 12 from the viewpoint of ensuring prevention of the steel wire 12 from falling off, and particularly within 2 cm. preferable.

The twisting by the twisting device 30 is performed by twisting the twisted portion 34 in one and the opposite direction by a predetermined amount. The amount of twist differs depending on the strength of the steel wire 12, but is generally the number of times the steel wire 12 is plastically deformed, preferably 2 to 6 times per 100 times the length of the wire diameter. In contrast, the number of times the residual torque generated by twisting in one direction is released, preferably 0.5 to 2 times per 100 times the wire diameter.
The twisting is generally performed by twisting in one direction and then twisting back in the other direction, but in some cases, twisting may be applied again.

Next, the manufacturing method of the rubber sheet concerning this embodiment is demonstrated.
When the rubber sheet 26 is formed using the rubber sheet manufacturing apparatus 10, first, the steel wires 12 are pulled out from the plurality of spools 16, and the number of steel wires 12 corresponding to the number of driving required for the rubber sheet 26 is obtained. Are bundled into a steel wire bundle 14 and introduced into the guide plate 20. Next, the steel wire bundle 14 introduced into the guide plate 20 is guided to the comb-teeth roll 22, passed one by one through the teeth 24 of the comb-teeth roll 22, aligned in parallel, and sent to the calendar 18. In the calendar 18, a rubber material is introduced into the steel wire bundle 14 aligned in parallel and subjected to calendar processing (rolling). Thereby, the rubber sheet 26 in which the steel wire bundle 14 is embedded is obtained.

In the rubber sheet manufacturing method of the present embodiment, the steel wire bundle 14 is pulled out from the spool 16 and then introduced into the guide plate 20 before the end portion side (length m) of the steel wire bundle 14 is introduced. Twisting is performed.
In the twisting, the one end side of the steel wire bundle 14 is grasped and fixed by the twisted portion 34, and the fixing portion 32 is separated from the twisted portion 34 by a length L so that the length m from the fixed end portion can be secured. Place and secure the steel wire bundle 14. In this state, the twisted portion 34 is twisted to one side until the residual torque is saturated, and then twisted so that the residual torque does not remain in the opposite direction.

  When the steel wire bundle 14 that has been twisted in this way is introduced into the guide plate 20, a bundle of wrinkles is imparted to the individual steel wires 12 constituting the steel wire bundle 14 by twisting. Since the flexibility increases, the steel wire 12 does not jump out and fall off when being set on the comb-teeth roll 22 after being introduced into the guide plate 20. Moreover, since the flexibility is given to each steel wire 12, handling becomes easy.

  According to the present embodiment, the steel wire bundle 14 can be efficiently guided to the comb-tooth roll 22, and the number of resets caused by the jumping out of the steel wire 12 can be significantly reduced.

  In the present embodiment, the steel wire 12 is wound around the spool 16, and the twisting is performed after the steel wire 12 is pulled out from the wound state. However, the present invention is not limited to this. The steel wire 12 having a predetermined length that is not wound can be twisted in the same manner, and the effects of the present invention can be obtained in the same manner.

  In the present embodiment, the twisting device 30 is disposed upstream of the guide plate 20 in the wire moving direction, and twisting is performed before being aligned with the guide plate 20, but twisting is performed before being guided to the comb-tooth roll 22. It is not limited to this as long as the combination can be performed. For example, the twisting device 30 may be disposed between the guide plate 20 and the comb roll 22. Alternatively, fixing means may be provided on the guide plate 20 so that the fixing portion 32 of the twisting device 30 is also used. Thereby, the apparatus configuration can be further simplified.

  Further, in this embodiment, a single steel wire 12 wound around the spool 16 is used. However, a plurality of steel wires 12 that are not twisted are wound around one spool 16. May be. The number of steel wires 12 wound around one spool 16 varies depending on the number necessary for the target rubber sheet 26, but is preferably 2 to 6 from the viewpoint of tire performance.

[Second Embodiment]
Next, with reference to FIG. 3, the rubber sheet manufacturing apparatus 40 concerning the 2nd Embodiment of this invention is demonstrated. In addition, the same code | symbol is attached | subjected to the member same as 1st Embodiment, and description is abbreviate | omitted.
In the rubber sheet manufacturing apparatus 40 according to the second embodiment, a plurality of spools 16 around which a plurality of steel wires 12 are wound are arranged. A plurality of (three in FIG. 3) steel wires 12 are wound around each spool 16, and the plurality of steel wires 12 drawn from each spool 16 are bundled together to guide plate 20. Has been led to.
The plurality of steel wires 12 wound around the individual spools 16 according to the present embodiment are previously twisted by the twisting device 30 with respect to the twisted region on the end side. The twisting performed before winding the spool 16 is performed in the first embodiment by using a device having the fixing portion 32 and the twisting portion 34 similar to the twisting device 30 used in the first embodiment. It can be carried out under the same twisting conditions as those performed.
Thereby, without incorporating the twisting device 30 into the rubber sheet 26 manufacturing apparatus 40, the steel wire 12 is twisted together, and the steel wire 12 is effectively prevented from jumping out when being guided to the guide plate 20, thereby Efficiency can be improved.

  In the embodiment of the present invention, the steel wires 12 are bundled and then twisted in the twisting device 30 or a plurality of steel wires 12 that have been twisted are wound around the spool 16 and guided to the guide plate 20. It is not limited to. For example, a single steel wire 12 that has been twisted in advance may be bundled and guided to the guide plate 20, and then twisted again using the twisting device 30.

  Examples of the present invention will be described below, but the present invention is not limited thereto. Further,% in the examples is based on weight (mass) unless otherwise specified.

A high carbon steel wire rod having a diameter of 5.5 mm containing 0.80% carbon was dry-drawn until the diameter became about 1.4 mm, and then subjected to a patenting treatment and a brass plating treatment. This wire is wet-drawn to 0.21 mm, and after final wire drawing dies, straightness is corrected using rolls arranged in a staggered pattern, and then wound on a spool to produce a rubber sheet. 120 wires were prepared. A spool around which one steel wire is wound is referred to as a spool A.
Similarly, three spools are prepared by winding steel wires each having straightness corrected using rolls arranged in a staggered pattern after the final wire drawing dies, and these are simultaneously wound to one spool. 40 pieces were prepared by winding three steel wires around the same spool. A spool around which three steel wires are wound in this manner is referred to as a spool B.

Spool A or B around which one or three steel wires are wound is set in the rubber sheet manufacturing apparatus as shown in Table 1, and the steel wire is unwound from the unwinding of the calendar. The wires were bundled to form one steel wire bundle and twisted together.
The twisting was performed by adjusting the positions of the twisted portions so that the lengths shown in Table 1 were obtained. In each case, the portion where the twisting was not substantially performed was a portion from the tip of the steel wire bundle to 1 cm.
The twisting was performed by twisting 255 times / m clockwise and then twisting back 47 times / m counterclockwise so that there was no residual torsion. This was also applied to the steel wire for each other set spool. Three steel wire bundles twisted to the end portion were passed through a guide plate, and each set was guided to a comb tooth roll. The results are shown in Table 1.
For comparison, three steel wire bundles similar to the above except that twisting was not performed were passed through a guide plate and set to a comb roll. The results are shown in Table 1.
The three steel wire bundles set on the comb-tooth roll were then rolled together with a separately drawn rubber material to produce a rubber sheet.

As shown in Table 1, in Examples 1 to 3, since any of the spools is used, twisting is performed with respect to a part of the end portion side of the steel wire bundle. There is no loss of workability when setting on a roll.
In particular, when the twisted portion exceeded 30 cm (Examples 1 and 2), the steel wire did not come off from the comb roll, and the workability was remarkably good.

  On the other hand, in Comparative Examples 1 and 2 in which twisting is not performed, the steel wire comes off from the comb-tooth roll regardless of which spool is used, so it is necessary to reset the steel wire. The nature was greatly impaired.

  From this, according to the present embodiment, the steel wire is guided to the comb tooth roll after being twisted with respect to the end side portion of the steel wire, so that the steel wire does not come off when being set to the comb tooth roll. A rubber sheet can be produced with good workability.

It is the schematic of the rubber sheet manufacturing apparatus concerning the 1st Embodiment of this invention. It is the schematic of the twist apparatus in the rubber sheet manufacturing apparatus concerning 1st Embodiment. It is the schematic of the rubber sheet manufacturing apparatus concerning the 2nd Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Rubber sheet manufacturing apparatus 12 Steel wire 14 Steel wire bundle 16 Spool 20 Guide plate 22 Comb roll 30 Twisting device 32 Fixing part 34 Twisting part

Claims (6)

A method of manufacturing a rubber sheet by bundling a plurality of steel wires and aligning them with a guide plate, and then conducting a calendering treatment after guiding them to a comb tooth roll,
Before the plurality of steel wires are guided to the comb-teeth roll, twisting is performed on at least a part of the end portions of the plurality of steel wires.   2. The method for producing a rubber sheet according to claim 1, wherein twisting is performed before the plurality of steel wires are aligned with the guide plate.   3. The method for producing a rubber sheet according to claim 1, wherein the plurality of steel wires that are not twisted and wound are drawn out and twisted.   The method for producing a rubber sheet according to claim 3, wherein 2 to 6 steel wires are wound around one winding member.   The method for producing a rubber sheet according to claim 1 or 2, wherein twisting is performed on at least a part of the ends of 2 to 6 steel wires.   The method for producing a rubber sheet according to any one of claims 1 to 5, wherein at least a part of an end portion side of the steel wire to be twisted has a length of 30 to 200 cm.

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