JP2003145642A - Method for sticking tire component member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To properly stick a tire component member by one pressure roller without causing a wrinkle or a foam and without bringing about an air gathering in an overlapping part. SOLUTION: The tire component member G wound round sequentially on a molding drum 2 is stuck by pressing it down by the pressure roller 4. The pressure roller 4 has an inner layer 8 of a rubber-like elastic material 8A and an outer layer 9 of a sponge material 9A. The present method comprises a low-pressure pressing process S1 of pressing with a low pressure without crushing the outer layer 9 completely and a high-pressure pressing process S2 of pressing with such a high pressure as crushes the outer layer 9 completely.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for attaching a tire constituent member, which is capable of performing both a low pressure pressing step and a high pressure pressing step with one pressure roller, which is useful for space saving and cost reduction. Regarding

[0002]

2. Description of the Related Art When manufacturing a green tire, a sheet-shaped tire constituent member G supplied from a servicer a, for example, an inner liner rubber or a carcass ply is attached to a forming drum c, as schematically shown in FIG. The above is sequentially wrapped and laminated in a cylindrical shape.

At this time, in order to properly press the tire constituent member G and to adhere it accurately without causing wrinkles or bubbles, a layer of urethane rubber or the like has conventionally been formed around a metal core member with high elasticity. The high pressure pressing step using the pressure bonding roller r1 and the low pressure pressing step using the low elasticity pressure bonding roller r2 in which a sponge material layer is formed are performed.

In the case of a thin unvulcanized rubber sheet such as an inner liner rubber or a carcass ply, for example, in order to attach the thin unvulcanized rubber sheet to the molding drum c without wrinkles or bubbles, a soft wrapping press is applied. Since it is necessary to attach the sponge material to the sponge material, a pressure-sensitive adhesive roller r2 having a low elasticity is used to press the sponge material layer at a low pressure so that the sponge material layer is not completely crushed.

On the other hand, as shown in FIG. 6 (A), when the inner liner rubber G1 is adhered, a stepped air reservoir e is formed between the inner drum rubber G1 and the molding drum c at the overlapping portions j at both ends in the circumferential direction. , Causing cracks in the finished tire and lowering air pressure retention and durability. Therefore, as shown in FIG. 6 (B), it is required to crush the air reservoir e.
It cannot be crushed sufficiently because it is too soft just by increasing the pressing force. Therefore, in this overlapping part j,
It is necessary to perform strong pressing using the high-elasticity pressure roller r1.

[0006]

However, in the conventional method using the two pressure-bonding rollers r1 and r2, the size of the apparatus is increased and the number of parts is increased, which hinders space saving and cost reduction. Become. In addition, pressure bonding roller r2
Then, there is also a problem that the difference in rigidity between the sponge material and the metal core member becomes excessively large, and the sponge material is liable to be peeled off or broken and the service life is shortened.

Therefore, the present invention uses a pressure roller having an inner layer made of a rubber-like elastic material and an outer layer made of a sponge material having a lower elasticity than the rubber-like elastic material around the core member. Basically, a pressing step at a low pressure that does not crush and a pressing step at a high pressure that completely crushes the outer layer is performed. A tire structure in which the tire constituent members can be properly adhered to each other without causing air pockets, space saving and cost reduction can be achieved, and the durability of the sponge material is increased to improve the service life of the pressure bonding roller. The purpose is to provide a method for attaching members.

[0008]

In order to achieve the above object, the invention of claim 1 of the present application is a tire structure in which sheet-shaped tire constituent members which are successively wound on a molding drum are pressed by a pressure roller to be stuck. A method of attaching members, wherein the pressure-bonding roller comprises an inner layer made of a rubber-like elastic material and an outer layer made of a sponge material having a lower elasticity than the rubber-like elastic material around the core member, and A low pressure pressing step of pressing the tire constituent member at a low pressure without the outer layer being completely crushed, and a high pressure pressing step of pressing the tire constituent member at a high pressure to completely crush the outer layer. I am trying.

According to the second aspect of the invention, the pressure roller presses the tire constituent member by the rod extension of the air cylinder, and high pressure and low pressure working air is conducted to the air cylinder through the switching valve. Is characterized by.

The invention of claim 3 is characterized in that the pressure of the high-pressure working air is 300 to 500 Kpa and the pressure of the low-pressure working air is 100 to 200 Kpa.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below.
This will be described together with the illustrated example. FIG. 1 is a side view conceptually showing a sticking apparatus 1 for carrying out the sticking method of the present invention. In the present example, the sticking apparatus 1 is an air that can move forward and backward toward a forming drum 2. A pressure roller 4 is pivotally attached to the tip of the rod 3A of the cylinder 3 via a roller holder 5 about an axis parallel to the molding drum 2.

Then, a sheet-shaped tire constituent member G, which is wound around the molding drum 2 in the circumferential direction, is attached by pressing the pressing roller 4 by advancing the rod 3A. The tire constituent member G includes the inner liner rubber G1 and the carcass ply as described above.

In this example, the air cylinder 3 is a double-acting cylinder having a guide shaft 6 (shown in FIG. 2) built therein, and moves the rod 3A forward and backward by the inflow of working air which is compressed air. . Further, in this embodiment, the roller holder 5 is, as shown in FIG. 2, a support shaft 11 for rotatably supporting the pressure roller 4, and a U-shaped holder fitting for removably holding both ends of the support shaft 11. 12, and the holder metal fitting 12 is fixed to each tip of the rod 3A and the guide shaft 6.

In the present embodiment, the pressure roller 4 has a rubber-like elastic material 8A around the core member 7 having bearings 10 fitted on the support shaft 11 at both ends of the cylindrical body 7A. It has a two-layer structure in which an inner layer 8 and an outer layer 9 made of a sponge material 9A having a lower elasticity than the rubber-like elastic material 8A are provided.

The rubber-like elastic material 8A is a diene rubber such as natural rubber (NR), SBR, BR, CR, II.
Various elastic materials having rubber elasticity, such as non-diene rubbers such as R, EPDM, U and Q, and thermoplastic elastomers can be used. The rubber-like elastic material 8A is a non-foamed so-called solid state, and the inner layer 8 is Make up. The rubber-like elastic material 8A has a rubber hardness (durometer A hardness) of 30.
The thickness T1 is preferably up to 60 °, and the thickness T1 of the inner layer 8 is preferably in the range of 10 to 30 mm.

The sponge material 9A is a porous rubber obtained by foaming a rubber-like elastic material such as rubber or synthetic resin, and has a continuous-cell porous rubber (so-called sponge rubber) and a closed-cell porous rubber (so-called). Expansive rubber) can be used. The sponge material 9A preferably has a foaming ratio of 15 to 30 times, and the thickness T2 of the outer layer 9 is preferably in the range of 15 to 40 mm. As the material of the sponge material 9A, it is desirable to use one having excellent adhesiveness with the rubber-like elastic material 8A. In this example, urethane rubber is used as the rubber-like elastic material 8A and neoprene is used as the sponge material 9A. The case where a form is used is illustrated.

Further, the sticking device 1 is provided with an operating circuit 20 for operating the air cylinder 3 by turning on and off the operating air. As shown in FIG. 3, one example of the operating circuit 20 is that a high-pressure air source 21 for supplying operating air
A branch air passage 23A that branches into two via the on / off valve 22;
With 23B. The working air H from the high-pressure air source 21 is supplied to the desired high-pressure side working air Ha in one branch air passage 23A.
Pressure regulator 2 to set decompression to (300-500Kpa)
4A intervenes, and the other branch air passage 23B interposes a pressure regulator 24B that decompresses the working air H from the high-pressure air source 21 to a desired low-pressure side working air Hb (100 to 200 Kpa).

The high pressure side and low pressure side working airs Ha and Hb are selectively passed through the respective branch air passages 23A and 23B.
The book operation flow path 25 is electrically connected through a 3-port switching valve 26. In addition, the working flow path 25 is a 5-port switching valve 27.
Via a branch air passage 28F communicating with the port 3f on the side where the rod 3A of the air cylinder 3 is extended and a branch air passage 28R leading to the port 3r on the side where the rod 3A is retracted.

However, when the inner liner rubber G1 supplied from the servicer is wound around the molding drum 2,
The switching valve 27 is switched, and by the rod extension (extension operation) of the air cylinder 3 by the working air Hb on the low pressure side, the pressure bonding roller 4 presses the inner liner rubber G1 and adheres it to the molding drum 2.

At this time, since the working air Hb is on the low pressure side, as shown in FIG.
The outer layer 9 is not completely crushed, and the inner liner rubber G1 is pressed with a low pressure so as to softly wrap it by utilizing the characteristics of the sponge material 9A. That is, the low pressure pressing step S1 with the sponge material 9A is performed, and the inner liner rubber G1 can be attached without wrinkles or bubbles.

The expansion ratio of the sponge material 9A is 15
If it is less than twice, the pushing pressure becomes excessive and wrinkles tend to occur. On the other hand, if the expansion ratio exceeds 30, it becomes difficult to adhere sufficiently. Further, the thickness T2 of the sponge material 9A is 15 mm.
When it is less than 40 m, the outer layer 9 is easily crushed, and it becomes difficult to control such that the setting range of the working air Hb is narrowed.
If it exceeds m, the pressure roller 4 becomes unnecessarily thick and impairs operability.

When the overlapping portion J of the inner liner rubber G1 approaches the pressure roller 4, the switching valve 26 is switched and the high pressure side working air Ha flows into the air cylinder 3. As a result, as shown in FIG. 4B, the outer layer 9 of the pressure-bonding roller 4 is completely crushed, and the rubber elastic material 8A on the inner side presses the overlapping portion J strongly and hard under high pressure. That is, the high pressure pressing step S by the rubber-like elastic material 8A
2 is performed, the overlapping portion J is strongly and firmly pressed, and the air pool e at the overlapping portion J can be crushed and eliminated.

The pressing by the pressure-bonding roller 4 is applied not only to the inner liner rubber G1 but also to other tire constituent members G such as a carcass ply.

If a roller in which a layer of sponge material 9A is directly formed on the core member 7 is used, a difference in rigidity between the core member 7 and the sponge material 9A occurs in a step shape.
When the sponge material 9A is completely crushed and used, it is difficult to ensure durability such that the sponge material 9A is separated from the core member 7 due to stress concentration or the sponge material 9A itself is broken. In order to sufficiently enhance the durability of the sponge material 9A, the rubber hardness of the rubber-like elastic material 8A is 60 °.
The following is preferable, and the rubber hardness is preferably 30 ° or more in order to firmly crush the air pocket.

As described above, in this embodiment, the inner layer made of the rubber-like elastic material and the outer layer made of the sponge material are provided.
Since the pressure roller having the layered structure is used, both the low pressure pressing step S1 utilizing the characteristics of the sponge material and the high pressure pressing step S2 utilizing the characteristics of the rubber-like elastic material can be freely performed. That is, while ensuring durability, the tire component G can be properly adhered by the single pressure-bonding roller 4 without generating wrinkles or bubbles and without creating air pockets in the overlapping portion J, Space saving and cost reduction of the device can be achieved.

Although a particularly preferred embodiment of the present invention has been described above in detail, the present invention is not limited to the illustrated embodiment and can be modified into various modes.

[0027]

[Example] A pressure-bonding roller was prototyped according to the specifications shown in Table 1, and the inner-liner rubber was adhered by using this pressure-bonding roller, and wrinkles, bubbles were generated, and air was trapped at the overlapping portion. The durability was tested, and the results are shown in Table 1. The rubber-like elastic material used for each pressure roller is made of urethane rubber and rubber hardness (50 °).
The same sponge material was used for the material (neoprene foam) and the expansion ratio (25 times).

(1) Occurrence of wrinkles and air bubbles: The presence of wrinkles and air bubbles was checked over the entire circumference of the drum by a visual inspection, and those having no wrinkles and air bubbles were judged as "absent". (2) Air accumulation at the overlapping portion: The presence or absence of air accumulation at the overlapping portion was checked by visual inspection, and the air accumulation that had not been completely collapsed was regarded as "none". (3) Durability: Rolling was performed for 96 hours under a predetermined operating air pressure to confirm whether or not the sponge material was damaged.

[0029]

[Table 1]

[0030]

Since the present invention is constructed as described above,
While ensuring durability, a single pressure roller can be used to properly attach tire constituent members without causing wrinkles or air bubbles and air pockets in the overlapping portion, saving space in the device and The cost can be reduced.

[Brief description of drawings]

FIG. 1 is a side view schematically showing a sticking device for carrying out a sticking method of the present invention.

FIG. 2 is a sectional view showing a pressure roller together with a roller holder.

FIG. 3 is a diagram showing an example of an operating circuit of an air cylinder.

4A and 4B are cross-sectional views illustrating a pressing state in a low pressure pressing step and a high pressure pressing step.

FIG. 5 is a diagram illustrating a conventional technique.

6A and 6B are diagrams for explaining the problem.

[Explanation of symbols]

2 forming drum 3 Air cylinder 4 Crimping roller 7 core member 8 inner layer 8A rubber-like elastic material 9 outer layer 9A sponge material 26 switching valve G Tire component Ha, Hb High and low pressure working fluid S1 low pressure pressing process S2 High pressure pressing process

Claims (3)

[Claims] 1. A method for adhering a tire constituent member, comprising pressing a sheet-shaped tire constituent member, which is successively wound on a molding drum, by a pressure bonding roller, and bonding the tire constituent member, wherein the pressure bonding roller is provided around a core member. A low-pressure press that comprises an inner layer made of a rubber-like elastic material and an outer layer made of a sponge material having a lower elasticity than the rubber-like elastic material, and presses the tire constituent member at a low pressure without completely crushing the outer layer. A method for applying a tire component, comprising: a step; and a high-pressure pressing step of pressing the tire component with a high pressure to completely crush the outer layer. 2. The pressure-bonding roller presses a tire constituent member by the rod extension of an air cylinder, and high-pressure and low-pressure working air is conducted to the air cylinder through a switching valve. The method for sticking the tire constituent member according to 1. 3. The pressure of the high-pressure working air is 300 to 50.
The working air pressure of 0 Kpa and low pressure is 100 to 200.
Kpa is used, The tire constituent member sticking method of Claim 2 characterized by the above-mentioned.