JP2000301627A - Manufacture of regenerated tire - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for manufacturing a regenerated tire which contributes to increasing the rate of regeneration of a used tire. SOLUTION: A tire having the side part 3 and the bead part 4 having a flaw deep upto a casing 1 and the tread part 2 with at least a flaw-free belt layer 5 after the service life of the tire is selected. The belt layer 5 or the flaw-free tread part 2 including the belt layer 5 is separated from this used tire A and is bound to a separately prepared flaw-free base tire 7.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a retreaded tire, and more particularly, to a method for manufacturing a retreaded tire for improving the rehabilitation rate of a used tire.

[0002]

2. Description of the Related Art A retreaded tire separates a part of the outer layer side of a belt layer together with a tread portion or a tread portion from a used tire having worn tread rubber, and separates the belt layer with a new tread portion or a tread portion therefrom. It is a tire that has been rehabilitated by replacing a part of it.

[0003] However, used tires selected for rehabilitation by the conventional tire rehabilitation method are not discarded if they have scratches on the surface for safety during running, and are discarded.
That is, when there is a deep wound reaching the casing at the side portion or the bead portion, or when there is a deep wound reaching the innermost layer of the belt at the tread portion, all are discarded regardless of the conditions. Therefore, the rehabilitation rate was not always high, and it could not be said that it was effectively recycled.

[0004]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a method for manufacturing a retreaded tire capable of improving a used tire retreading rate.

[0005]

According to the method for manufacturing a retreaded tire according to the present invention which solves the above-mentioned problems, a used tire having a flaw reaching a casing in a side portion or a bead portion, but having at least a belt layer intact in a tread portion. And separating the belt layer or an intact tread portion including the belt layer from the used tire, and connecting the intact base tire prepared separately.

According to another method of manufacturing a retreaded tire of the present invention, the tread has a flaw reaching the innermost layer of the belt.
The side part and the bead part sort intact used tires, separate the base tire including the side part and the bead part from the used tire, and separate the intact tread part and belt layer separately prepared for the base tire. It is characterized by combining.

[0007] Still another method of manufacturing a retread tire according to the present invention is to select a used tire in which at least a belt layer is intact at a side portion or a bead portion, but the tread portion has an intact belt layer. An intact tread portion including the belt layer or the belt layer separated from the tread portion has a scratch reaching the innermost layer of the belt,
The side part and the bead part are characterized by selecting an intact used tire and connecting it to a base tire including the side part and the bead part separated from the used tire.

According to the present invention, there are all conventional tires such as a used tire having a wound reaching the casing at the side portion or the bead portion and a used tire having a scratch reaching the innermost layer of the belt at the tread portion as described above. The former should be reused when the belt layer of the tread is intact in the former, and when the side and bead are intact in the latter, to improve the rehabilitation rate of used tires. Can be.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a flowchart showing the present invention and a conventional retread tire manufacturing process. FIG.
FIG. 3 and FIG. 3 respectively illustrate used tires that are raw materials of a retreaded tire. In each of the used tires, a carcass layer 1 is arranged on the innermost layer of the tire so as to extend from the tread portion 2 to the left and right side portions 3, 3 and the bead portions 4, 4 to form a casing. Carcass layer 1
And a plurality of plies of the belt layer 5 are arranged between them. Since both have been used, the surface layer of the tread portion 2 is worn, and the groove 6 is shallow. Some of these used tires are injured. For example, in the case of the used tire A in FIG. 2, the side portion 3 has a deep scratch 8 reaching the carcass layer 1. In the case of the used tire B, the tread portion 2 has a deep scratch 9 reaching the innermost layer 5u of the belt.

[0010] The used tires having various forms are mainly collected from a tire dealer to a rehabilitation factory. First, a large number of these used tires collected,
As shown in the flow chart of FIG. 1, the following A, B,
It is classified into four types, C and D.

A: Used tire having a deep scratch reaching the casing (carcass layer) at the side portion or the bead portion, but having at least the belt layer intact at the tread portion. For example,
The tire illustrated in FIG. 2 corresponds to the tire. In FIG. 2, a tire in which only the tread portion 2 is damaged is included in the category A at least when the belt layer is intact. B: Used tire in which the tread portion has a deep scratch reaching the innermost layer of the belt, but the side portion and the bead portion are intact. For example, the tire illustrated in FIG.

C: Used tire in which the side portion and the bead portion are intact and the tread portion has at least the belt layer intact. Although not illustrated in the figures, the tire does not have deep scratches 8 and 9 like the used tires of FIGS. 2 and 3. A tire in which at least the belt layer is intact is included in the category C if only the tread rubber is damaged. D: Casing (carcass layer) on side part or bead part
A used tire having a deep scratch reaching the belt layer on the tread portion.

In the conventional tire rehabilitation method, classification A, B, D
All of the used tires were discarded because safe running could not be guaranteed even if they were rehabilitated because only treads and / or side parts or bead parts had deep scratches, and only Class C was used for rehabilitation tires .

In the present invention, a retreaded tire is manufactured from the used tires of the classes A and B, which have been conventionally discarded, by a method described below. (1) Method of Reusing Used Tires of Class A In this method, when the intact belt layer 5 or the tread portion 2 has a small wear amount from the used tire A as shown in FIG. The intact tread portion 2 is separated and reused.

First, the amount of wear of the tread portion 2 of the used tire A is determined, and the tire is classified into a tire having a large amount of wear and a tire having a small amount of wear (step A1). In this sorting step, most are the former tires, and the latter tires having a small amount of wear are rare.

A tire with a small amount of wear on the tread portion 2
A separation plane X─X between the innermost layer 5u of the belt and the carcass layer 1
As shown in FIG. 4A, the belt layer 5 and the tread portion 2 are separated from the base tire 7 including the side portion 3, the bead portion 4 and the carcass layer 1 so as to form an integrated annular body. (Step A2).

Next, an annular body of the belt layer 5 and the tread portion 2 is separately prepared and a base tire 7 as shown in FIG.
The retreaded tire 1 as shown in FIG. 7 is fitted and adhered to the outer peripheral surface of the tire using a cushion rubber sheet and an adhesive.
Get 0. The base tire 7 must have a structure in which the belt layer and the tread portion are separated as shown in FIG. 5 and must be intact, and may be separated from the used tire B as described later, or may be used. It may be separated from the tire C.

Further, in the used tire A determined in the above-mentioned sorting step as a tire having a large amount of wear on the tread portion 2, the tread portion 2 is buffed, and the rough surface 5
s is formed (Step A4). Next, with the space between the belt layer 5 and the carcass layer 1 as a separation plane XX, an intact annular body of the belt layer 5 as shown in FIG. 4B is separated from the base tire 7 (step A4).

This annular belt layer 5 (A5) is fitted and adhered to the outer peripheral surface of an intact base tire 7 as shown in FIG. 5 separately prepared in the same manner as described above using a cushion rubber sheet and an adhesive. . Next, a belt-shaped precured tread 11 separately prepared is wound around and adhered to the outer peripheral surface 5S of the belt layer 5 by an amount corresponding to the outer peripheral length, thereby obtaining a retreaded tire 10 as shown in FIG.

The above is the case of the so-called pre-cure rehabilitation method in which a pre-cure tread is attached. In the case of the remold rehabilitation method using an unvulcanized tread, the used tread which has been determined to have a small amount of tread wear in the above-mentioned separation step. After buffing the tread portion 2 of the tire A to separate the belt layer 5 from the base tire 7, both end portions 5e and 5e of the belt layer 5 are removed as shown in FIG. Buffing is performed (Step A6). On the other hand, as shown in FIG. 6, the base tire 7 used in the remolding rehabilitation method has a tread portion and a belt layer removed and both end portions 7e of the side portion 3 removed. The base tire 7 is attached to both end portions 5 as described above.
The ring-shaped body of the belt layer 5 from which e has been removed is fitted and bonded to the cushion rubber sheet by using an adhesive, and FIG.
After the unvulcanized tread 12 is attached so as to wrap the rough surface 5s and both end surfaces of the belt layer 5 as described above, it is inserted into a mold, and pattern forming and vulcanization are performed in the mold to obtain the structure shown in FIG. The retreaded tire 10 as shown in FIG. (2) Method of Reusing Used Tire B In this method, the base tire 7 including the intact side part 3, bead part 4, and carcass layer 1 is separated from the used tire B as shown in FIG. Use.

First, the innermost layer 5 of the belt of the used tire B
The tread portion 2 and the belt layer 5 are separated from the pedestal tire 7 by setting a space between the carcass layer u and the carcass layer 1 as a separation plane XX (step B).
1) When the tread is rehabilitated by the pre-cure rehabilitation method, the base tire 7 as shown in FIG. 5 is obtained (step B2). The base tire 7 from which the part 7e has been cut is obtained (step B3).

The base tire 7 obtained in the step B2 is intact including the belt layer 5 and the precured tread 11 or the belt layer 5 shown in FIGS. 4A and 4B separately prepared from the used tire A. The tread portion 2 is fitted and bonded in the same manner as described above to obtain a retreaded tire 10 as shown in FIG. Further, after the belt layer 5 and the unvulcanized tread 12 shown in FIG. 4 (c) are fitted to the base tire 7 obtained in the step B3 in the same manner as described above, it is inserted into a mold and molded and vulcanized. Thereby, the retreaded tire 10 as shown in FIG. 8 is obtained. (3) Method of Reusing Used Tires A and B In this method, in the above (1) and (2), the intact belt layer 5 separated from the used tire A or the intact belt layer 5 and the tread portion 2 And the base tire 7 separated from the used tire B to regenerate the tire.

That is, FIG. 4 separated in step A2
(A) an integrated annular body of the belt layer 5 and the tread portion 2;
Alternatively, FIGS. 4B and 4C separated in step A4
Combining the annular belt layer 5 with the pre-cured tread 11 or the uncured tread 12, and applying the pre-cure rehabilitation method or the remold rehabilitation method to the base tire 7 of FIG. 5 or 6 separated in the step B1. The retreaded tire 10 shown in FIG. 7 or FIG. 8 is manufactured.

As described above, according to the above methods (1) to (3), a recycled tire is manufactured by reusing the used tire A and / or the used tire B which have been discarded by the conventional rehabilitation method. To improve the rehabilitation rate of used tires,
It can be used for effective use of earth resources and environmental conservation.

In particular, as described in (3) above, the used tire A and the used tire B are combined and
By manufacturing 0, the rehabilitation rate of the used tire can be efficiently improved.

In general, when the quantity of used tires collected for the purpose of manufacturing a retreaded tire is statistically viewed in each of Classes A, B, C and D, Class A is 5 to 15% and Class B is 10 to 10%.
20%, and Class C is about 65 to 75%. Therefore, by making the tires of the classes A and B in such a quantity ratio reusable, the rehabilitation rate can be improved by as much as 25%.

[0027]

As described above in detail, according to the present invention, a used tire having a scratch reaching the casing at the side portion or the bead portion, a used tire having a scratch reaching the innermost layer of the belt at the tread portion, etc. In the former method, all tires were discarded.In the former, when the belt layer of the tread is intact, and in the latter, when the side and the bead are intact, the used tires are rehabilitated. Rate can be improved.

[Brief description of the drawings]

FIG. 1 is a flowchart including a manufacturing process of the present invention and a conventional retreaded tire.

FIG. 2 is a half sectional view in the meridian direction of a used tire A used in the embodiment of the present invention.

FIG. 3 is a half sectional view in the meridian direction of a used tire B used in the embodiment of the present invention.

4 (a) to 4 (c) are each a half sectional view of a belt layer generated in the process of manufacturing a retreaded tire according to the present invention.

FIG. 5 is a half sectional view in the meridian direction showing an example of a base tire used in the manufacturing method of the present invention.

FIG. 6 is a half-sectional view in the meridian direction showing another example of the base tire used in the manufacturing method of the present invention.

FIG. 7 is a half-sectional view in the meridian direction showing an example of a retreaded tire manufactured by the manufacturing method of the present invention.

FIG. 8 is a meridional half-sectional view showing another example of a retread tire manufactured by the manufacturing method of the present invention.

[Explanation of symbols]

 Reference Signs List 1 carcass layer 2 tread part 3 side part 4 bead part 5 belt layer 5u innermost layer of belt 7 tires 8, 9 deep wound 10 retread tires A, B, C, D used tires

Claims (6)

[Claims] 1. A side tire or a bead portion having a flaw reaching a casing, but a tread portion of a used tire in which at least a belt layer is intact, and the intact tire including the belt layer or the belt layer is used from the used tire. A method for manufacturing a retreaded tire in which the tread portion is separated and joined to a separately prepared intact base tire. 2. A tread portion having a flaw reaching the innermost layer of the belt, but a side portion and a bead portion are intact used tires, and a base tire including the side portion and the bead portion is separated from the used tire. And a method of manufacturing a retreaded tire in which an intact tread portion separately prepared on the base tire and a belt layer are joined. 3. The method for producing a retreaded tire according to claim 2, wherein the separately prepared intact tread portion is a precured tread. 4. The method for manufacturing a retreaded tire according to claim 2, wherein the separately prepared intact tread portion is an unvulcanized remolded tread. 5. A side portion or a bead portion has a flaw reaching a casing, but a tread portion selects a used tire having at least a belt layer intact, and removes the belt layer or the belt layer separated from the used tire. The intact tread portion includes a scratch reaching the innermost layer of the belt in the tread portion, but the side portion and the bead portion include an intact used tire and the side portion and the bead portion separated from the used tire. A method of manufacturing a retreaded tire to be combined with a base tire. 6. A retreaded tire manufactured by the method according to claim 1.