JP2001334585A - Method for preparing tire constitutional member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for preparing a tire constitutional member in which when terminal parts of a plurality of layers of sheet materials are stuck together, two layers with the same sheet crosssection as other parts can be obtained and which can provide an enough bonding strength and can improve quality of the tire and appearance of the tire. SOLUTION: Two kinds of rubbery elastic bodies extruded from an extruder 1 are molded by larninating two-layer sheet materials W1 and W2 apex positions of whose both end parts in the width direction are shifted by a specified length L by means of an extrusion head 3 and in addition, both end parts in the width direction are molded with a width H provided with tapered parts 6a and 6b with a definite angle of slope and corresponding to the peripheral length of a drum of the molding drum by means of two rolls. As the first enbodiment of practice when two kinds of the sheet materials W1 and W2 are stuck together, they are cut into a specified length in the longer direction of the sheet materials W1 and W2 by means of a cutting device and the cut sheet materials W1 and W2 are fed to the molding drum side through a transferring means and are stuck together.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a tire component such as an inner liner, and more particularly to a method of manufacturing a sheet-like sheet material having a plurality of layers formed of the same kind of material at both ends in the width direction without a step. The present invention relates to a method for manufacturing a tire constituent member which enables lamination between members.

[0002]

2. Description of the Related Art Conventionally, when a sheet material such as an inner liner to be used as a tire constituent material is formed by using two or more calenders, during rolling, the trim material is trimmed to a tire specification width and wound into a long length. Thereafter, the sheet material is cut into a required length (for example, a length corresponding to the drum circumference) in a tire forming machine and used.

[0003]

By the way, a method of obliquely cutting the end portion of the laminated sheet material for the purpose of improving the quality and the appearance has been performed, but the angle of the cut end face is limited. Therefore, when they are bonded together in a state where the terminal portions are abutted or overlapped, the bonding strength is insufficient, and a step is formed, thereby causing problems such as poor appearance.

[0004] In addition, when the terminal portion of the two-layer sheet material is bonded, another layer is sandwiched between each layer of the bonded portion (splice portion), and the bonding is performed for bonding the sheet materials of the same compound. However, in this case as well, there is a problem that the bonding strength is insufficient, and the quality is lowered.

[0005] An object of the present invention is to affix the terminal portions of the sheet materials by abutting or overlapping the terminal portions when the terminal portions of the sheet material of a plurality of layers are bonded.
It is an object of the present invention to provide a method for producing a tire component, which can provide two layers having the same sheet cross section as the other parts and can improve the sufficient bonding strength, the quality of the tire and the appearance of the tire.

[0006]

According to the present invention, in order to achieve the above object, a first method for manufacturing a tire component according to the present invention comprises the steps of: simultaneously forming a plurality of layers of sheet material by rolling means with a profile; A taper portion having a constant inclination angle with the tip position shifted at both ends in the width direction of the sheet material is formed at a width corresponding to the drum circumferential length of the forming drum, and the sheet material is cut into a predetermined length. When the tapered portions at both ends in the width direction are bonded, at least the same kind of material is bonded without any step.

In a second method of manufacturing a tire component according to the present invention, when a plurality of layers of sheet material are simultaneously formed by rolling means with a profile, tapered portions having a constant inclination angle are provided at both ends in the width direction of the sheet material. When forming the sheet material to a width corresponding to the drum peripheral length of the forming drum, when cutting the sheet material to a predetermined length and bonding the tapered portions at both ends in the width direction, at least the same kind of material is used. The gist is that the lamination is performed without any steps.

According to the present invention, when a plurality of layers of sheet material are simultaneously formed by rolling means with a profile, a tapered portion having a constant inclination angle is formed at both ends in the width direction with the tip position shifted. Along with forming a width corresponding to the drum circumferential length of the forming drum, or forming a taper portion of a constant inclination angle at both ends in the width direction,
Formed to a width corresponding to the drum circumference of the forming drum, and when cutting the sheet material to a predetermined length and bonding the tapered portions at both ends in the width direction, at least the same materials are stuck together without any level difference. By combining them, two layers having the same sheet cross section as the other parts are obtained, and sufficient bonding strength, quality of the tire and appearance of the tire can be improved.

[0009]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a front view of a manufacturing apparatus for carrying out the method for manufacturing a tire component according to the present invention, FIG. 2 is a side view taken along the line AA in FIG. 1, and 1 is two kinds of sheet materials. W
1, an extruder for laminating and extruding W2, 2 for the head of the extruder 1, 3 for a profiled rolling means attached to the extrusion head, and the profiled rolling means 3 having a profile shape of the sheet material W1 on the surface. The two upper and lower rolling rolls 5a and 5b provided with the groove 4 in one of the forms corresponding to the above are vertically mounted so as to be able to approach and separate from each other.

As shown in FIG. 3 (a), the two types of rubber-like elastic bodies extruded from the extruder 1 are arranged such that the extruding head 2 adjusts the tip positions of both ends in the width direction by a predetermined length L. The shifted two layers of the sheet materials W1 and W2 are laminated and formed, and furthermore, both ends in the width direction are fixed at a predetermined inclination angle by two rolling rolls 5a and 5b as shown in FIGS. 3 (b) and 3 (c). And has a width H corresponding to the drum circumference of a forming drum (not shown).

The two-layer sheet material W thus formed
As a first embodiment in the case of laminating the sheet material W1 and W2, the sheet material W1 and W2 are cut to a predetermined length by a cutting device (not shown) in the longitudinal direction, and the cut sheet material W is cut.
1 and W2 are supplied to the forming drum side via a conveying means such as a conveying conveyor and a transfer drum,
As shown in (b) and (c), they are bonded by a method as shown in FIG.

That is, in the case where two layers of sheet materials W1 and W2 whose front end positions at both ends in the width direction are shifted by a predetermined length L at the left and right positions are wound around a forming drum and their terminal portions are abutted and pasted. As shown in (b), the sheet materials W1a and W2a at the left end and the sheet materials W1b and W2b at the right end are abutted as shown in (b), and after crimping, they are completely smooth and flat as shown in (c). Materials of the same kind are pressed together.

Further, since both end portions in the width direction are formed in the tapered portions 6a and 6b having a constant inclination angle, FIG.
As shown in FIGS. 6A and 6B or FIGS. 6A and 6B, the same effects as in the first embodiment can be obtained even when the overlap margin X is large.

That is, FIGS. 5A and 5B show a case where two layers + 1 layer are obtained by slightly laminating the overlap margin X, and FIGS. 6A and 6B. In the case of the above, lamination of two layers + two layers is performed.

Next, FIGS. 7 (a), 7 (b) and 7 (c)
In the sheet materials W1 and W2 of the layers, each sheet material W
This is another embodiment in which both end portions in the width direction of W1 and W2 are formed in tapered portions 6a and 6b having a fixed inclination angle without shifting the front end position. The parts are formed at a constant ratio.

In the case of this embodiment as well, FIG.
As shown in the crimping steps (b) and (c), since both ends in the width direction are formed in the tapered portions 6a and 6b having a constant inclination angle, at the time of bonding (b) and after crimping (c). In this case, the same effects as in the first embodiment can be obtained. Since both end portions of the sheet materials W1 and W2 are formed in a tapered shape, the same effect can be obtained even when the overlap margin X is large.

Further, as shown in FIG. 8, only the lower sheet material W2 has tapered portions 6a, 6b at both ends.
In this case, the same effects as in the first embodiment can be obtained, and the same effects can be obtained even when the overlap margin X is large.

As described above, in each of the embodiments of the present invention, when simultaneously forming a plurality of layers (two layers in this embodiment) of the sheet materials W1 and W2 by the rolling means with a profile, the tip positions are set at both ends in the width direction. The tapered portions 6a and 6b having a constant inclination angle are formed so as to be shifted from each other, and the taper portions 6a and 6b having a constant inclination angle are formed at both ends in the width direction. When the sheet material W1, W2 is cut to a predetermined length and the tapered portions 6a, 6b at both ends in the width direction are bonded together,
At least the same kind of material can be stuck together without any step, so that two layers having the same sheet cross section as the other parts can be obtained, and sufficient bonding strength, tire quality and tire appearance can be improved. You can do it.

In the above-described embodiment, the method of forming with two rolling rolls 5a and 5b has been described. However, it is also possible to form with a two-layer single roller die system as shown in FIG.

That is, two layers of sheet materials W1 and W2 extruded from the extruder 1 are laminated by a single roll 5c having grooves on the surface corresponding to the profile shape of the sheet material. As in the case of the first embodiment, both ends in the width direction may be provided with tapered portions 6a and 6b having a fixed inclination angle, and may be formed with a width H corresponding to the drum circumferential length of the forming drum.

[0022]

According to the present invention, since both ends of a sheet material of a plurality of layers are abutted or superposed by the above-mentioned method, two layers having the same sheet cross-section as the other portions are obtained, and a sufficient amount of sheet material is obtained. There is an effect that the joining strength and the quality of the tire can be improved, and the appearance of the tire can also be improved.

[Brief description of the drawings]

FIG. 1 is a front view of a manufacturing apparatus for carrying out a method for manufacturing a tire component according to the present invention.

FIG. 2 is a side view taken along the line AA of FIG. 1;

FIGS. 3 (a), (b), and (c) are explanatory views of a process of forming a tapered portion having a fixed inclination angle by shifting the front ends of both ends in a forming process of a two-layer sheet material.

FIGS. 4 (a), (b), and (c) are process explanatory views of the first embodiment in which two layers of sheet material are laminated.

FIGS. 5A and 5B are process explanatory views of another embodiment of laminating two layers of sheet material.

FIGS. 6A and 6B are process explanatory diagrams of another embodiment in which two layers of sheet material are laminated.

FIGS. 7 (a), (b) and (c) are explanatory views of a bonding step of a two-layer sheet material having a tapered portion according to a second embodiment of the present invention.

FIG. 8 is a process explanatory view of another embodiment of laminating two layers of sheet material.

FIG. 9 is a sectional view of a two-layer single roller die system showing another embodiment of the present invention.

[Explanation of symbols]

 Reference Signs List 1 extruder 2 extrusion head 3 rolling means with profile 4 groove 5a, 5b two rolling rolls 5c single roller 6a, 6b taper portion W1, W2 sheet material W1a, W2a sheet material H sheet material width L shifted length X Layering allowance

Claims (5)

[Claims] When a plurality of layers of sheet material are simultaneously formed by a rolling means with a profile, a tapered portion having a constant inclination angle is formed at both ends in the width direction of the sheet material by shifting the leading end thereof, and the forming drum is formed. A tire that is formed to have a width corresponding to the drum circumferential length, and when the sheet material is cut into a predetermined length and the tapered portions at both ends in the width direction are bonded, at least the same kind of material is bonded without any step. A method for manufacturing a component. 2. The method for manufacturing a tire component according to claim 1, wherein the tapered portions at both ends in the width direction of the sheet material are abutted and bonded. 3. The method for manufacturing a tire component according to claim 1, wherein the tapered portions at both ends in the width direction of the sheet material are overlapped and bonded. 4. When simultaneously forming a plurality of layers of sheet material by means of rolling means with a profile, tapered portions having a constant inclination angle are formed at both ends in the width direction of the sheet material and correspond to the drum peripheral length of the forming drum. Formed to the width
A method for producing a tire component, in which when the sheet material is cut into a predetermined length and tapered portions at both ends in the width direction are bonded, at least the same material is bonded without any step. 5. The method for manufacturing a tire component according to claim 4, wherein tapered portions at both ends in the width direction of the sheet material are abutted and bonded.