JP4415455B2 - Manufacturing method of tire component - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method of manufacturing a tire constituent member such as an inner liner, and more specifically, the same kind of materials can be bonded to each other in a state where there are no steps at both ends in the width direction of a plurality of sheet materials formed into a sheet shape. The present invention relates to a method for manufacturing a tire constituent member.
[0002]
[Prior art]
Conventionally, when forming a sheet material such as an inner liner to be used as a tire constituent material with two or more calendars, the trim material is trimmed at the tire specification width during rolling, and the sheet material is wound up into a long length. In a tire molding machine, it is cut into a required length (for example, a length corresponding to the drum circumference) and used.
[0003]
[Problems to be solved by the invention]
By the way, there is a method of obliquely cutting the bonded terminal portion of the sheet material for the purpose of improving quality, improving the appearance, etc., but there is a limit to the angle of the cut end face, and therefore the terminal portion is abutted. When pasted in a state or in an overlapped state, the bonding strength was insufficient or a step was formed, causing problems such as poor appearance.
[0004]
Moreover, when laminating the terminal portion of the two-layer sheet material, another layer is sandwiched between each layer of the laminating portion (splice portion), and it is not a laminating joint between sheet materials of the same compound. Also in this case, there is a problem such as insufficient bonding strength, which causes a deterioration in quality.
[0005]
The object of the present invention is to obtain two layers having the same sheet cross section as the other parts by abutting or overlapping and laminating the terminal parts of each sheet material when the terminal parts of a plurality of layers of sheet material are laminated. Another object of the present invention is to provide a method for manufacturing a tire constituent member that can improve sufficient bonding strength, tire quality, and tire appearance.
[0006]
[Means for Solving the Problems]
The present invention, order to achieve the above object, when a laminate of two kinds of sheet materials by profiles with rolling means is molded out press simultaneously, the both widthwise ends of the sheet material, shifting the tip position In addition to forming a taper portion having a constant inclination angle, the tape material is formed in a width corresponding to the drum circumferential length of the forming drum, the sheet material is cut into a predetermined length, and the taper portions at both ends in the width direction are bonded together. In this case, the gist is to bond the same kind of materials together without any step.
[0007]
Here, the taper portions at both ends in the width direction of the sheet material may be abutted and bonded, or the taper portions at both ends in the width direction of the sheet material may be overlapped and bonded.
[0008]
Further, the rolling means with profile is composed of two upper and lower rolling rolls that are attached in a vertical direction so as to be close to and away from each other, and one of the rolling rolls is provided with a groove in a form corresponding to the profile shape of the sheet material on the surface. It is also possible to use a rolling roll or to use a single roll provided with grooves in a form corresponding to the profile shape of the sheet material on the surface.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the accompanying drawings.
[0010]
FIG. 1 is a front view of a manufacturing apparatus for carrying out the method for manufacturing a tire constituent member of the present invention, FIG. 2 is a side view taken along arrow AA in FIG. 1, and 1 is two types of sheet materials W1 and W2. 2 is a head of the extruder 1, 3 is a profiled rolling means attached to the extrusion head, and the profiled rolling means 3 corresponds to the profile shape of the sheet material W1 on the surface. Two up-and-down rolling rolls 5a and 5b provided with one of the grooves 4 in the form are attached in a vertical direction so as to be close to and away from each other.
[0011]
The two types of rubber-like elastic bodies extruded from the extruder 1 are obtained by shifting the tip positions at both ends in the width direction by a predetermined length L by the extrusion head 2 as shown in FIG. Layered sheet materials W1 and W2 are laminated and formed, and further, by two rolling rolls 5a and 5b, as shown in FIGS. 3 (b) and 3 (c), both end portions in the width direction are tapered portions with a fixed inclination angle. 6a and 6b, and is molded with a width H corresponding to the drum circumferential length of a molding drum (not shown).
[0012]
In the first embodiment in the case of bonding the two-layer sheet materials W1 and W2 formed in this way, the sheet materials W1 and W2 are cut to a predetermined length by a cutting device (not shown) in the longitudinal direction. The sheet materials W1 and W2 are supplied to the forming drum side via a conveying means such as a conveying conveyor or a transfer drum, and pasted by a method as shown in FIGS. 4 (a), 4 (b), and 4 (c). Combined.
[0013]
That is, when two-layer sheet materials W1 and W2 in which the tip 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 the end portions are butted and pasted ( As shown in b), the sheet materials W1a and W2a at the left end are abutted against the sheet materials W1b and W2b at the right end, and after crimping, the same kind of materials are completely in a smooth surface state as shown in (c). Will be crimped.
[0014]
Further, since both end portions in the width direction are formed as tapered portions 6a and 6b having a constant inclination angle, as shown in FIGS. 5 (a) and (b) or FIGS. 6 (a) and (b), Even if the overlap margin X is large, the same effect as in the first embodiment can be obtained.
[0015]
That is, in the case of FIGS. 5 (a) and 5 (b), it is a case where 2 layers + 1 layers are obtained by laminating a slight overlap allowance X, and in the case of FIGS. 6 (a) and 6 (b). Is a lamination of 2 layers + 2 layers.
[0016]
Further, as shown in FIG. 7 , even when only the lower sheet material W2 is formed in the tapered portions 6a and 6b at both ends thereof, the same effect as in the first embodiment can be obtained. The same effect can be obtained even when the overlap margin X is large.
[0017]
As described above, in each embodiment of the present invention, when simultaneously forming a plurality of layers (two layers in this embodiment) of sheet materials W1 and W2 by the rolling means with profile, the tip positions are shifted at both ends in the width direction. The taper portions 6a and 6b having a constant inclination angle are formed, the width corresponding to the circumferential length of the forming drum is formed, or the taper portions 6a and 6b having a constant inclination angle are formed at both ends in the width direction. At the same time, when the sheet material W1, W2 is cut into a predetermined length and the taper portions 6a, 6b at both ends in the width direction are bonded together, the width is made to correspond to the drum circumferential length of the forming drum. Can be bonded together without any step, so that two layers with the same sheet cross section as the other part can be obtained, and sufficient bonding strength, tire quality and tire appearance can be improved. That.
[0018]
In the above embodiment, the method of forming with the 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.
[0019]
That is, the two layers of sheet materials W1 and W2 extruded from the extruder 1 are laminated by a single roll 5c having a shape corresponding to the profile shape of the sheet material on the surface, and the first embodiment described above. Similarly to the above, both end portions in the width direction are provided with taper portions 6a and 6b having a constant inclination angle, and can be formed with a width H corresponding to the drum circumferential length of the forming drum.
[0020]
【The invention's effect】
Since this invention abuts or overlaps and laminates both end portions of a plurality of sheet materials by the method as described above, two layers having the same sheet cross section as the other portions can be obtained, and sufficient bonding strength and tire 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 of manufacturing a tire constituent member according to the present invention.
FIG. 2 is a side view taken along the line AA in FIG.
FIGS. 3A, 3B, and 3C are explanatory diagrams of a process of forming a taper portion having a constant inclination angle by shifting the tip portions at both ends in the forming process of the two-layer sheet material.
4A, 4B, and 4C are process explanatory views of a first embodiment in which two layers of sheet materials are bonded together.
FIGS. 5A and 5B are process explanatory views of another embodiment in which two layers of sheet materials are bonded together.
6A and 6B are process explanatory views of another embodiment in which two layers of sheet materials are bonded together.
FIG. 7 is a process explanatory diagram of another embodiment in which two layers of sheet material are bonded together.
FIG. 8 is a cross-sectional view of a two-layer single roller die system showing another embodiment of the present invention.
[Explanation of symbols]
1 extruder
2 extrusion head
Rolling means with 3 profiles
4 grooves
Two rolling rolls 5a and 5b
5c single roller
6a, 6b taper part
W1, W2 sheet material
W1a, W2a sheet material
H sheet material width L shifted length
X stacking allowance

Claims (5)

When molded out simultaneously pressing by laminating two kinds of sheet materials by profiled rolling unit, both widthwise ends of the sheet material, with by shifting the tip position to form a tapered portion of a constant inclination angle, molding It is formed in a width corresponding to the drum circumference of the drum, and when the sheet material is cut to a predetermined length and the taper portions at both ends in the width direction are bonded together, the same kind of materials are bonded together without any step. Manufacturing method of tire constituent member.   The manufacturing method of the tire constituent member according to claim 1, wherein the taper portions at both ends in the width direction of the sheet material are abutted and bonded together.   The manufacturing method of the tire structural member according to claim 1, wherein the taper portions at both ends in the width direction of the sheet material are overlapped and bonded together. The rolling means with profile is composed of two upper and lower rolling rolls attached in a vertical direction so as to be capable of approaching and separating, and one rolling roll is provided with a groove having a form corresponding to the profile shape of the sheet material on the surface. The manufacturing method of the tire structural member of Claim 1 which uses a roll. 2. The method for manufacturing a tire constituent member according to claim 1, wherein the rolling means with a profile uses a single roll provided with a groove having a shape corresponding to a profile shape of a sheet material on a surface thereof.