JP2002018973A - Method for manufacturing tire constituent member and tire - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a simple method for manufacturing a tire constituent member, capable of freely adjusting even the thickness of coating rubber by compact equipment. SOLUTION: In the method for manufacturing the tire constituent member, a cylindrical thin film body 2 is provided on the periphery of a drum 13 and ribbon-shaped rubber 1 is spirally wound around the cylindrical thin film body 2 so as to be partially overlapped to manufacture the tire constituent member 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a method for manufacturing a tire component such as an inner liner.

[0002]

2. Description of the Related Art In a conventional general method, a tire component such as an inner liner is manufactured in advance as a continuous band-shaped member having a predetermined width, and is wound around a bogie. Then, it is unwound and cut into fixed lengths at the time of use, and the cut tire components are supplied to a forming drum and adhered to the drum.

[0003]

As described above, the preparation process before using the tire component is increased in size, and a large space for equipment is required. It is also necessary to prepare a truck for each size. Furthermore, the thickness of the covering rubber is single and cannot be adjusted.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a simple method for manufacturing a tire component member in which the thickness of a covering rubber can be freely adjusted with compact equipment. .

[0005]

In order to achieve the above object, according to the first aspect of the present invention, a cylindrical thin film is provided around a drum, and a ribbon-like thin film is provided on the cylindrical thin film. A method for manufacturing a tire component is provided in which a rubber is wound spirally so as to partially overlap rubber to manufacture a tire component.

[0006] Since the ribbon-shaped rubber is a narrow band-shaped rubber member, a manufacturing apparatus such as an extruder, and a feeding and winding apparatus for a cylindrical thin film provided around a drum are compact.
The equipment can be reduced in size, the size can be changed, and the rubber coating can be performed with an arbitrary width without switching the width, so that productivity can be improved.

[0007] The cylindrical thin-film body prevents the ribbon-like rubber wound spirally thereon from breaking at the seam overlapped with each other upon expansion during molding, because the cylindrical thin-film body itself becomes a core material. be able to.

According to a second aspect of the present invention, in the method of manufacturing a tire constituent member according to the first aspect, the drum rotates together with the circumferentially disposed cylindrical thin film body and relatively moves in the axial direction of the drum. The ribbon rubber is supplied onto the rotating cylindrical thin film while rotating.

Since the ribbon-shaped rubber is supplied onto the rotating cylindrical thin film while relatively moving in the axial direction of the drum, the ribbon-shaped rubber can be easily wound spirally on the cylindrical thin-film with a compact facility. Can be attached.

According to a third aspect of the present invention, in the method of manufacturing a tire component according to the first or second aspect, the ribbon-like rubber is molded and extruded by an extruder, and is directly provided around the drum. Characterized by being supplied on a cylindrical thin film body.

The ribbon-like rubber molded and extruded by the extruder is supplied directly onto the tubular thin film without being wound up and stored, so that no storage facility is required, which contributes to downsizing of the facility. .

According to a fourth aspect of the present invention, in the method for manufacturing a tire component according to the first, second or third aspect, the cylindrical thin film is a polymer film.

[0013] The tire component is manufactured by attaching a polymer film further inside, and the vulcanized rubber can be vulcanized without bladder instead of the bladder during vulcanization of a green tire. Note that the polymer film includes a thermoplastic resin film, a polyethylene film, and the like.

According to a fifth aspect of the present invention, the ribbon-shaped rubber is spirally wound on the drum so as to partially overlap the drum, and the winding pitch of the spirally wound ribbon-shaped rubber is changed depending on the winding position. The method for manufacturing a tire constituent member, wherein the thickness of the covering rubber is changed depending on the location.

If the winding pitch of the ribbon-shaped rubber is reduced, the thickness of the coated rubber can be increased. If the winding pitch is increased, the thickness of the coated rubber can be reduced. And can be easily changed.

According to a sixth aspect of the present invention, in the method of manufacturing a tire component according to the fifth aspect, the winding pitch at the location of the covering rubber to be a tire center portion and a shoulder portion having a large elongation is reduced. Characterized in that the covering rubber is formed thicker than the above-mentioned place.

Since the rubber covering the tire center portion and the shoulder portion having a high elongation ratio is formed thick, it is possible to easily extend the same portion to form a tire component member having a substantially uniform thickness.

According to a seventh aspect of the present invention, a plurality of types of rubber ribbons are spirally wound on a drum or a support so as to partially overlap each other, and a plurality of types of rubber layers are formed in the same layer. It is a manufacturing method of the tire constituent member which manufactures the formed tire constituent member.

Partially different types of rubber can be formed in the same layer, and it is easy to apply the most suitable rubber to each part of the tire.

According to an eighth aspect of the present invention, in the method of manufacturing a tire component according to the first, fifth or seventh aspect, the manufactured tire component is an inner liner of a pneumatic tire. And

The inner liner forming the inner layer of the pneumatic tire can be efficiently manufactured with a small facility. The tire having excellent airtightness can be easily manufactured by the inner liner.

According to a ninth aspect of the present invention, there is provided a tire manufactured by using a tire component manufactured by the manufacturing method according to any one of the first to eighth aspects.

A tire component is efficiently manufactured with a small facility, and a tire is manufactured using the tire component.
Good productivity.

[0024]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment according to the present invention will be described below with reference to FIGS. The present embodiment relates to a method for manufacturing an inner liner which is a tire constituent member provided in an inner layer of a tire, and FIG. 1 shows a schematic perspective view of an inner liner manufacturing apparatus 10 thereof.

A drum 13 is rotatably supported on a base 12 movable on a rail 11. Therefore drum 13
Is rotated by a motor provided on the base 12,
It can move in the rotation axis direction together with the base 12.

An extruder 15 is provided with the base facing the drum 13. The extruder 15 extrudes the supplied rubber material into a ribbon shape from a die by rotating a screw, and supplies the ribbon-shaped rubber 1 to the drum 13 from the side.

On the other hand, the cylindrical polymer film 2 is deformed flat and wound on a take-up roll 16.
The cylindrical polymer film 2 unwound from 16 is a cutter
The tire 13 is cut into a length corresponding to one tire, opened in a substantially cylindrical shape, and provided around the outer peripheral surface of the drum 13.

The extruder 15 supplies the ribbon-like rubber 1 onto the cylindrical polymer film 2 provided around the drum 13 as described above. Since the drum 13 moves in the axial direction while rotating, the ribbon-like rubber 1 supplied from the extruder 15 spirally winds on the cylindrical polymer film 2.

By adjusting the moving speed in the axial direction with respect to the rotation speed of the drum 13, the ribbon-shaped rubber is spirally wound so as to partially overlap and the cylindrical inner liner 3 is placed on the cylindrical polymer film 2. Form.

When the cylindrical inner liner 3 in which the cylindrical polymer film 2 is adhered to the inner layer is manufactured in this way, the inner liner 3 is supplied to the forming drum in a cylindrical state and is provided around the belt. The tread rubber is wound around the sidewall and vulcanized.

At the time of vulcanization, since the cylindrical polymer film 2 is adhered inside the inner liner 3, the polymer film 2 which is a thermoplastic resin performs bladderless vulcanization instead of a bladder. be able to.

Since the ribbon-like rubber 1 is a narrow band-like rubber member, the feeding and winding devices for the extruder 15 and the cylindrical polymer film 2 provided around the drum 13 are compact, and the equipment is downsized. it can.

The ribbon-like rubber 1 formed and extruded by the extruder 15 is directly wound on the drum 13 without being wound and stored.
Storage equipment is unnecessary, which contributes to downsizing of the equipment.

Further, since the ribbon-shaped rubber 1 is wound around the drum 13, the size can be easily changed only by changing the diameter of the drum, and inner liners of various sizes can be easily manufactured.

When the ribbon-shaped rubber 1 has a width W and a thickness t, and the winding pitch P of the ribbon-shaped rubber 1 is set to 0.8 W based on the rotation speed of the drum 13 and the moving speed in the axial direction, a spiral shape is obtained. As shown in FIG. 2, the inner liner 3 having a small thickness is manufactured as shown in FIG. When the winding pitch P of the ribbon-shaped rubber 1 is set to 0.2 W, a thick inner liner 3 is manufactured as shown in FIG.

As described above, the winding pitch P of the ribbon-shaped rubber 1 is adjusted by adjusting the moving speed in the axial direction with respect to the rotation speed of the drum 13 so as to make the width W of the ribbon-shaped rubber 1 a percentage. The thickness can be freely formed.

By adjusting only the moving speed in the axial direction while keeping the rotation speed of the drum 13 constant, it is possible to change the winding pitch and freely form the thickness of the inner liner.
Conversely, the winding pitch can be changed even if the rotational speed is adjusted while keeping the axial movement of the drum 13 constant. In the present embodiment, the drum 13 is moved in the axial direction, but the extruder 15 may be moved in the axial direction.

The cylindrical inner liner 3 has a tread portion at the center, a shoulder portion at the left and right sides, and a left and right portion extending from the side portion to the bead portion. This is the part where the elongation rate is high.

In order to spirally wind the ribbon-like rubber 1 on the cylindrical polymer film 2 provided around the drum 13, first, as shown in FIG. Winding at a pitch P (for example, 0.6 to 0.8 W), and a small pitch P '(for example, 0.2 to 0.4 W) in the middle
The inner liner 3 is formed thicker in the central area C extending from the center to the shoulder, and the lateral areas S, S on both left and right sides are formed thinner. Is done.

In other words, the inner liner is formed to be substantially uniform and to have the required thickness when the portion is greatly expanded and stretched during molding because the portion is formed thick from the tread portion having the highest elongation rate to the shoulder portion. Thus, a tire having excellent airtightness while reducing the weight can be manufactured.

Since the inner liner 3 is formed by overlapping ribbon-shaped rubber, there is a possibility that the inner liner 3 will break at the seam when expanded during molding. However, the polymer film 2 provided inside the inner liner 3 is Work as materials,
Cracking of the inner liner 3 can be prevented.

The effect is particularly remarkable by using a polymer film for a tire having an aspect ratio of 80% or more, but the polymer film is not so necessary for a tire having an aspect ratio of 50% or less. Need not be used.

In the case of a tire having a small flatness, the shoulder portion swells particularly greatly at the time of molding, so that the ribbon-shaped rubber 1 is spirally wound on the cylindrical polymer film 2 as shown in FIG. As described above, the portions which become the shoulder portions 20a, 20a somewhat away from the center are wound with a smaller pitch than the other portions to form an inner liner 20 which is thicker. The part that becomes the shoulder part is 2-
Formed about 10% thicker.

When the carcass 21 is wound around the inner liner 20 and is molded into a toroidal shape as shown in FIG. 6 by applying an internal pressure by a molding machine, the shoulder portion 20a is particularly elongated, and the entire inner liner is substantially shaped. Consisting of uniform and required thickness.

In the vulcanization molding, the inner liner
At 20, a bead core 22 is wound around at both ends together with the carcass 21 and folded back. At the center, a tread member 24 is wound on the carcass 21 with a belt member 23 interposed therebetween, and side walls 25 are attached to side portions.

Next, a plurality of extruders may be prepared so that ribbon-shaped rubbers of different rubber types can be supplied to the drum, and a plurality of types of ribbon-shaped rubbers may be partially wound. FIG. 7 shows an example of such a configuration, in which three types of rubber a, b, and c are used.

The inner liner portion L1 wide from the tread portion to the left and right side portions uses a rubber type a having a normal hardness as an inner liner, and a particularly hard rubber type b as a toe rubber portion L2 corresponding to the toe of the bead portion. Using
Further, a hard rubber type c is used as the rubber chafer portion L3 outside the bead portion. Rubber type a has a normal hardness, rubber type c is harder than rubber type a, and rubber type b is the hardest.

The procedure for winding the ribbon-shaped rubber is as follows. First, a ribbon-shaped rubber of normal rubber type a is wound around the polymer film 2 provided around the drum, and the inner liner section L
1 is formed at the center, and then a ribbon rubber of a particularly hard rubber type b is partially overlapped on the inner liner portion L1 and wound to form a toe rubber portion L2 on the left and right, and finally, a ribbon rubber of a hard rubber type c is formed. A rubber chafer L3 is formed on the left and right sides by partially overlapping and winding the toe rubber L2.

The inner liner thus formed
When the side wall 33 is laminated and vulcanized and formed integrally with the carcass 32, as shown in FIG.
The rubber chafer portion L3 is folded back with 31 wound around, and the toe rubber portion L2 forms an edge. Therefore, the toe rubber portion L2 constituting the bead portion of the tire is formed of the hard rubber type b, and the rigidity can be increased.

As described above, it is possible to partially cover different types of rubber, and it is easy to apply the most suitable rubber to each part of the tire. By spirally winding ribbon-shaped rubbers of different rubber types at an appropriate pitch, it is possible to easily manufacture a tire component member having an appropriate form and properties for each part by a small-sized manufacturing apparatus, It also contributes to the improvement of productivity.

In the above embodiment, the ribbon-shaped rubber 1 is spirally wound on the cylindrical polymer film provided around the drum. However, in the case where the cylindrical polymer film is not used. In some cases, a toroidal core is used as a support, and a ribbon-like rubber is wound thereon to form a tire component such as an inner liner.

In the above embodiment, the inner liner is formed on the cylindrical polymer film. However, the present invention is not limited to the inner liner, and the ribbon-shaped rubber is spirally wound on the cylindrical polymer film. To form a ply skim rubber or the like.

In the case where the skim rubber is formed of ribbon-like rubber, and the carcass is a two-ply tire,
The first carcass is used as a support, and a ribbon-like rubber is spirally wound thereon to form skim rubber, and the second carcass wound thereover is adhered to the first carcass via the skim rubber. To

Further, a material having a complicated shape such as a side wall can be formed by winding a ribbon-shaped rubber on a drum or a toroidal core as a support and spirally changing the pitch while changing the pitch.
FIG. 9, FIG. 10, and FIG. 11 are examples showing different sidewall shapes.

The side wall 41 shown in FIG. 9 has a shape in which one low ridge 41a is formed so as to gradually increase in thickness from both sides to the center, and the side wall 42 shown in FIG. The top of the mountain 41 is slightly recessed and two low mountains 42a and 42b are formed on both sides. The side wall 43 shown in FIG. A ridge 43a is formed for cushioning a curb or the like.

By spirally winding the ribbon-shaped rubber while changing the winding pitch in this manner, tire components having various shapes, fine ridges, and the like can be easily formed.

[Brief description of the drawings]

FIG. 1 is a schematic perspective view of an apparatus for manufacturing an inner liner according to an embodiment of the present invention.

FIG. 2 is a partial cross-sectional view of an inner liner having a large winding pitch of a ribbon-shaped rubber.

FIG. 3 is a partial cross-sectional view of an inner liner in which a winding pitch of a ribbon-shaped rubber is small.

FIG. 4 is a sectional view of an inner liner formed by changing a winding pitch of a ribbon-shaped rubber.

FIG. 5 is a sectional view of another inner liner formed by changing the winding pitch of the ribbon-shaped rubber.

FIG. 6 is a cross-sectional view illustrating a shape when molded using the inner liner.

FIG. 7 is a sectional view of an inner liner formed by changing a rubber type of a ribbon-shaped rubber.

FIG. 8 is a sectional view of a bead portion of a tire molded using the inner liner.

FIG. 9 is a cross-sectional view of a sidewall formed by spirally winding a ribbon-shaped rubber and molding it.

FIG. 10 is a cross-sectional view of another sidewall formed by spirally winding and molding a ribbon-shaped rubber.

FIG. 11 is a cross-sectional view of yet another sidewall formed by spirally winding and molding a ribbon-shaped rubber.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Ribbon rubber, 2 ... Cylindrical polymer film, 10 ... Inner liner manufacturing apparatus, 11 ... Rail, 12 ... Base, 13 ... Drum, 15 ... Extruder, 16 ... Winding roll, 17 ... Cutter, 20 …
Inner liner, 21 ... Carcass, 22 ... Bead core 22,23
... belt member, 24 ... tread member, 25 ... side wall, 30 ... inner liner, 31 ... bead core, 32 ... carcass, 33 ... side wall, 41, 42, 43 ... side wall.

Claims (9)

[Claims] 1. A tire component is manufactured by wrapping a cylindrical thin film around a drum and spirally winding a ribbon-like rubber on the cylindrical thin film so as to partially overlap. A method for manufacturing a tire component. 2. The method according to claim 1, wherein the drum is rotated together with the cylindrical thin film provided around the drum, and the ribbon rubber is supplied onto the rotating cylindrical thin film while relatively moving in the axial direction of the drum. The method for producing a tire component according to claim 1, wherein: 3. The ribbon-shaped rubber is formed and extruded by an extruder, and is supplied directly onto a tubular thin film provided around the drum. A method for manufacturing a tire component member. 4. The method according to claim 1, wherein the tubular thin film is a polymer film. 5. The thickness of the coated rubber by spirally winding the ribbon-shaped rubber on the drum so that the ribbon-shaped rubber partially overlaps, and changing the winding pitch of the ribbon-shaped rubber to be spirally wound depending on the winding position. The method for producing a tire component is characterized in that the tire component is changed depending on the location. 6. The coating rubber according to claim 5, wherein the winding pitch at the location of the covering rubber which becomes the tire center portion and the shoulder portion having a high elongation is reduced to make the covering rubber thicker than at other locations. A method for manufacturing a tire component member. 7. A tire constituent member in which a plurality of types of ribbon-shaped rubber are spirally wound on a drum or a support so as to partially overlap each other, and a plurality of types of rubber layers are formed in the same layer. A method for producing a tire constituent member, characterized by producing. 8. The method for producing a tire component according to claim 1, wherein the produced tire component is an inner liner of a pneumatic tire. 9. A tire manufactured using a tire component manufactured by the manufacturing method according to any one of claims 1 to 8.