JP4903944B2 - Method for forming tire constituent member - Google Patents

Description

【００２７】
表のごとく、本発明の形成方法では、廃材発生量を従来の略３３％にまで抑えることが確認できる。
【００２８】
【発明の効果】
叙上の如く本発明は、１次プライ材料を、長尺かつ巾狭の複数のプライ片を巾方向に連結することにより形成し、かつ連結に際して各プライ片の長手方向の前端縁を、裁断の角度に合わせて長手方向に順次位置ズレさせているため、生産性やタイヤ品質などを損ねることなく、廃材の発生を最小限に抑えることができる。
【図面の簡単な説明】
【図１】本発明の形成方法の一実施例を示す概念図である。
【図２】１次プライ材料の前端部を示す平面図である。
【図３】（Ａ）はその一部を示す断面図であり、（Ｂ）は、連結前のプライ片を示す断面図である。
【図４】プライ片の前端縁における位置ずれを説明する線図である。
【図５】従来技術を説明する線図である。
【図６】その問題点を説明する線図である。
【符号の説明】
１ タイヤ構成部材
２ １次プライ材料
３ 裁断片
３ｅ 非裁断縁
４ ２次プライ材料
５ プライ片
５ｅ 側縁
５ｆ 前端縁
６ ゴム耳部
１０ タイヤコード
１１ トッピングゴム
Ｓ１ 裁断工程
Ｓ２ 継ぎ工程[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for forming a tire constituent member capable of minimizing the generation of waste material when forming a tire constituent member in which tire cords are inclined with respect to the longitudinal direction.
[0002]
[Prior art]
In a pneumatic tire, various tire constituent members reinforced with tire cords are used for forming cord plies such as a carcass ply, a belt ply, and a bead reinforcing ply.
[0003]
Conventionally, such a tire constituent member is a long and wide primary ply material in which a cord array formed by aligning tire cords a in the longitudinal direction is embedded in a topping rubber b as shown in FIG. Formed with c as the original fabric.
[0004]
For more information,
(1) The primary ply material c is obliquely cut at a desired angle α with respect to the length direction, for example, in the case of a belt ply, usually 10 to 35 degrees, and at an interval La corresponding to the width w of the belt ply. Obtaining a parallelogram-shaped cut piece d;
{Circle around (2)} Each of the cut pieces d obtained in the above step is joined sequentially between the non-cut edges d1 and d1 so that the tire cord a is inclined and arranged at the angle α with respect to the joining direction. Obtaining a secondary ply material e,
For example, a belt ply is formed by winding the tire constituent member, which is the secondary ply material e, in the circumferential direction on a tire forming drum, for example.
[0005]
[Problems to be solved by the invention]
Accordingly, as shown in an enlarged view in FIG. 6, when the first cut piece d is cut out from the primary ply material c, a triangular waste material f is inevitably generated at the front end portion thereof. This waste material f is time-consuming and costly, for example, a cord removal process is required to recycle the rubber. Therefore, the generation of the waste material f is suppressed as low as possible from the viewpoint of cost and resource saving. desired.
[0006]
However, in the primary ply material c, in order to increase the productivity of the tire component by reducing the number of times of joining of the cut pieces d as much as possible, the width W0 tends to be widened to about 1.4 m. is there. In a belt ply or the like, the angle α is set to a very low value of 10 to 35 degrees. Therefore, the generation amount of the waste material f is very large.
[0007]
Therefore, the present invention is to form the primary ply material by connecting a plurality of long and narrow ply pieces in the width direction, and at the time of connection, the longitudinal end edge of each ply piece is set to the angle α. The object of the present invention is to provide a method for forming a tire constituent member capable of minimizing the generation of waste material without impairing productivity, tire quality, or the like, based on the sequential displacement in the longitudinal direction.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, the invention of claim 1 of the present application provides a long and wide primary ply material in which a cord array in which tire cords are aligned in the longitudinal direction is embedded in a topping rubber, Including a step of obtaining a cut piece by obliquely cutting the cut piece at an angle α with respect to the longitudinal direction, and the tire cord is inclined at the angle α with respect to the connecting direction by successively connecting the cut pieces with the uncut edges 2 A method of forming a tire component that is a next ply material,
The primary ply material connects a plurality of long and narrow ply pieces formed by embedding a cord array in which tire cords are aligned in a longitudinal direction in a topping rubber, between side edges thereof. And the front end edge in the longitudinal direction of each ply piece at the time of connection is sequentially displaced in the longitudinal direction according to the angle α,
The ply piece is characterized in that rubber ears for connecting adjacent ply pieces are provided on at least one side edge.
[0009]
In the invention of claim 2, the width W1 of the ply piece is 1/7 to 1/3 of the width W0 of the primary ply material.
[0010]
According to a third aspect of the present invention, the rubber lug has a width WA of 2.0 to 5.0 mm and a thickness TA of 1.0 to 2.0 mm.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a conceptual diagram showing a case where a tire constituent member for a belt ply is formed by the forming method of the present invention.
[0012]
In the figure, the method of forming the tire component 1 is as follows:
(1) A parallelogram-shaped cut piece 3 obtained by obliquely cutting the long and wide primary ply material 2 at an angle α with respect to the longitudinal direction and having an interval La corresponding to the width w of the belt ply. A cutting step S1 for obtaining
{Circle around (2)} The long cord in which the tire cord 10 is inclinedly arranged at the angle α with respect to the joining direction F by sequentially joining the respective cut pieces 3 obtained in the above process between the uncut edges 3e and 3e. And a splicing step S2 for obtaining the secondary ply material 4.
[0013]
In the present embodiment, prior to the cutting step S1, the primary ply material 2 includes a plurality of long and narrow ply pieces 5 between the side edges 5e as shown in FIG. In this connection, the front edge 5f in the longitudinal direction of each ply piece 5 is sequentially shifted in the longitudinal direction in accordance with the angle α. .
[0014]
As a result, it is possible to greatly reduce the amount of waste material f generated on the front end side that is generated when the first cut piece 3 is cut out from the primary ply material 2.
[0015]
Here, the ply piece 5 is a long and narrow belt-like body in which a cord array body in which tire cords 10 are aligned in the longitudinal direction is embedded in a topping rubber 11, and the width W1 is The primary ply material 2 is preferably set in the range of 1/7 to 1/3 of the width W0. In other words, it is preferable that one primary ply material 2 is formed from 3 to 7 ply pieces 5. If the number is less than 3, the effect of reducing the waste material f is inferior. The work efficiency and the connection accuracy when connecting the two are unnecessarily lowered. The width W0 of the primary ply material 2 is conventionally 1400 to 1600 mm. Therefore, the width W1 of the ply piece 5 is preferably in the range of 200 to 500 mm.
[0016]
Moreover, in the said ply piece 5, as shown to FIG. 3 (A), (B), the rubber ear | edge part 6 for connecting the adjacent ply piece 5 to the at least one side edge 5e protrudes, The rubber ears 6 are connected to each other by overlapping with adjacent ply pieces 5. In this example, the case where the rubber ear part 6 is formed only on one side is illustrated.
[0017]
The rubber ear 6 has a width WA of 2.0 to 5.0 mm, which is a protruding length from the outermost tire cord 10A, and is at least larger than the inter-cord distance D between the tire cords 10 and 10. In this example, (WA> D) is set to 2 × D or more. Therefore, as it appears on the other side edge side, it can be clearly distinguished from a simple rubber coating for the outermost tire cord 10A.
[0018]
Moreover, in the rubber ear part 6, in order to strengthen the said connection, it is preferable that the overlap width WB with the adjacent ply piece 5 shall be 0.5 mm or more, Furthermore, 1.0 mm or more. At this time, in order to maintain the homogeneity as the primary ply material 2, the inter-cord distance DD in the connecting portion is set to 1.0 to 2.0 times the inter-cord distance D in the ply piece 5. Is preferred. The rubber thickness TA of the rubber ear 6 is equal to or less than the ply thickness T of the ply piece 5, and in this example, the rubber thickness TA is in the range of 1.0 to 2.0 mm. If the thickness is less than 1.0 mm, the connecting strength tends to be insufficient. Conversely, if the thickness exceeds 2.0 mm, the connecting portion becomes too thick and the homogeneity tends to decrease, which is not preferable.
[0019]
Further, when the primary ply material 2 is formed by connecting the ply pieces 5, it is necessary to sequentially shift the front edge 5 f of each ply piece 5 in the longitudinal direction in accordance with the angle α. However, at this time, it is not necessary to make the positional deviation exactly coincide with the angle α, and as shown schematically in FIG. 4, two inclined lines y1 and y2 having the angle α When the corners P on the protruding corner side are sandwiched, the interval WD between the inclined lines y1 and y2 may be at least 50% or less of the width W0 of the primary ply material 2. However, in order to suppress the generation of the waste material f as much as possible, the interval WD is preferably as small as possible within a range of 30% or less, and further 20% or less.
[0020]
In such a forming method of the present invention, the ply piece 5 can be formed by using a small calender device, so that the equipment of a conventional large calender device becomes unnecessary. The ply piece 5 to be formed is once wound on a reel and stored and accommodated as a roll body 30 (shown in FIG. 1). The roll body 30 has a width of about 1/7 to 1/3 of the conventional one. Since it is small and lightweight, it is easy to handle, and it is easy to secure the storage location, to carry the roll body 30 into and out of the storage location, and to attach the unloaded roll body 30 to the reel stand. Can be done efficiently. In particular, these advantages are very large in recent years when the tendency for high-mix low-volume production is strong.
[0021]
In forming the primary ply material 2, as shown in FIG. 1, the ply pieces 5 are rewound all at once from the plurality of roll bodies 30, and the side edges 5 e of the adjacent ply pieces 5 are, for example, crimped. They are connected using a pressure bonding means 31 such as a roller. At this time, since the front edge 5f of each ply piece 5 is sequentially displaced in the longitudinal direction in accordance with the angle α, the generation of the waste material f generated in the first cutting can be greatly suppressed.
[0022]
The primary ply material 2 can be once wound up on a reel and stored and accommodated as a wide roll as in the prior art. However, in order to exhibit the advantages of the roll body 30 described above, it is preferable to sequentially perform the cutting step S1 and the joining step S2 sequentially after the primary ply material 2 is formed.
[0023]
In the formation method of the present invention, since the wide primary ply material 2 is formed prior to the cutting step S1, the number of joints of the cut pieces 3 in the joint step S2 can be reduced as in the prior art. The productivity and quality of tire components can be maintained at the same level as before.
[0024]
As mentioned above, although especially preferable embodiment of this invention was explained in full detail, this invention is not limited to embodiment of illustration, It can deform | transform and implement in a various aspect.
[0025]
【Example】
Using the forming method of the present invention, a tire constituent member for forming a belt ply was prepared based on the specifications shown in Table 1, and the weight of the waste material generated at that time was compared with that of the conventional forming method.
[0026]
[Table 1]

[0027]
As shown in the table, it can be confirmed that in the forming method of the present invention, the amount of waste material generated is suppressed to about 33% of the conventional amount.
[0028]
【Effect of the invention】
As described above, in the present invention, the primary ply material is formed by connecting a plurality of long and narrow ply pieces in the width direction, and the longitudinal front end edge of each ply piece is cut during connection. Since the position is sequentially shifted in the longitudinal direction according to the angle, the generation of waste materials can be minimized without impairing productivity and tire quality.
[Brief description of the drawings]
FIG. 1 is a conceptual diagram showing one embodiment of a forming method of the present invention.
FIG. 2 is a plan view showing a front end portion of a primary ply material.
3A is a cross-sectional view showing a part thereof, and FIG. 3B is a cross-sectional view showing a ply piece before connection.
FIG. 4 is a diagram for explaining a positional shift at a front end edge of a ply piece.
FIG. 5 is a diagram for explaining the prior art.
FIG. 6 is a diagram illustrating the problem.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Tire component 2 Primary ply material 3 Cutting piece 3e Uncut edge 4 Secondary ply material 5 Ply piece 5e Side edge 5f Front end edge 6 Rubber ear 10 Tire cord 11 Topping rubber S1 Cutting process S2 Joint process

Claims (3)

A process in which a long and wide primary ply material in which a cord array in which tire cords are aligned in the longitudinal direction is embedded in a topping rubber is cut obliquely at an angle α with respect to the longitudinal direction to obtain a cut piece A tire constituent member that is a secondary ply material in which the tire cord is inclined at the angle α with respect to the joining direction by sequentially joining the respective cut pieces at the uncut edge.
The primary ply material connects a plurality of long and narrow ply pieces formed by embedding a cord array in which tire cords are aligned in a longitudinal direction in a topping rubber, between side edges thereof. And the front end edge in the longitudinal direction of each ply piece at the time of connection is sequentially displaced in the longitudinal direction according to the angle α,
The tire ply piece is provided with a rubber lug for connecting adjacent ply pieces on at least one side edge thereof. 2. The method for forming a tire constituent member according to claim 1, wherein a width W1 of the ply piece is 1/7 to 1/3 of a width W0 of the primary ply material. 3. The formation of a tire component according to claim 1, wherein the rubber ear has a width WA of 2.0 to 5.0 mm and a thickness TA of 1.0 to 2.0 mm. Method.

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