JP2002113719A - Mold for molding tire and tire molding method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a mold for molding a tire and a tire manufacturing method, capable of simply and accurately controlling the length of spew or rubber burr generated at the time of production of a tire and capable of enhancing production efficiency. SOLUTION: In the mold 2 for molding the tire having a vent hole 1, the vent hole 1 has a hole diameter calculated by general formula 1; Y1=5.662Y2+0.872X1-4.967X2-0.01 [wherein, Y1 is an estimate value of the length of spew, Y2 is the hole diameter of the selected vent hole, X1 is the known length of spew obtained by a vent hole set to a standard and X2 is the hole diameter of the standard vent hole. The material and vulcanizing molding condition of a green tire are made almost constant].

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a tire manufacturing method. More specifically, the present invention relates to a tire molding die and a tire manufacturing method capable of easily and accurately controlling the length of a spew or rubber burr generated during tire manufacturing and improving manufacturing efficiency.

[0002]

2. Description of the Related Art Generally, a tire for automobiles has a groove extending in a tire circumferential direction (hereinafter, sometimes referred to as a “rib groove”) and a groove extending in a tire width direction (hereinafter, a “lug groove”).
There is that. "Bone" having a convex shape corresponding to ())
And a member called a "blade" having thin protrusions corresponding to the fine grooves, using such a tire forming die, an unpolymerized rubber It is manufactured by so-called "compression molding" of pressing a so-called "green tire" made of a material and having no tread pattern formed thereon and vulcanizing and molding.

In this compression molding, a closed space is formed between the bone or blade of the tire molding die and the green tire. When the air in this space loses its place to go, the tire molded product becomes a “bear”. This produces the so-called bubble loss.

As a method for preventing the bear, a method for manufacturing by pressing a tire molding die having a small hole called a “vent hole” for communicating the outside with the above-mentioned closed space to a green tire ( Vent hole type)
And, the tire mold is divided into small pieces, and the tire mold is pressed against the green tire while removing the air in the closed space described above through the gap between the pieces when combining the small pieces. There is a manufacturing method (slit vent type), but at present, a vent hole type which is excellent in terms of manufacturing cost and the like is widely used.

In this vent hole type, when a molding die is pressed against a green tire, rubber penetrates into the vent hole to generate rubber whiskers called “Spyu”. This spew deteriorates the appearance characteristics and initial performance of the tire, and is preferably cut after vulcanization. However, in order to perform this cutting mechanically, the length of the spew must be within a certain range (about 10 ２０20 mm).

However, the spew length depends on the vulcanization temperature, the vulcanization time, the pressing pressure of the mold, the position where the spew is formed (for example, the pressing pressure applied to the tire is different between the center of the tire and the end of the tire). It is known that it is determined by various factors such as vulcanization molding conditions, rubber material of green tires, hole diameter of vent holes, etc.Conventionally, in order to control the spew length, each time the manufacturing conditions change, these It was thought that each condition needed to be specifically investigated.

[0007] However, such investigations and examinations are very time-consuming and significantly reduce the production efficiency. Therefore, in practice, workers on the site actually produce tires several times, At present, the length of the spew is controlled by appropriately fine-tuning the diameter of the vent hole, and there are still problems in terms of efficient production and accurate control of the spew length.

On the other hand, the inventor of the present application presses a tire molding die in which a micro vent piece having an opening having a slit shape or a circle is buried in a vent hole against a green tire, and a tire molding die and a green tire are formed. A method of forming a tread pattern while removing air in a closed space formed between the micro vent pieces through an opening of the micro vent piece (Japanese Patent Application No. 11-359905) (hereinafter referred to as “micro vent piece”). Type ").

[0009] The micro vent piece type is an excellent method in which the spew or rubber burr can be extremely shortened, the die manufacturing cost is low, and the die is easily cleaned after pressing.

However, even this micro vent piece type is similar to the conventional vent hole type in that it is difficult to control the length of the spew or rubber burr.

[0011]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described problems, and can easily and accurately control the length of a spew or a rubber burr generated during tire manufacturing, thereby improving manufacturing efficiency. It is an object of the present invention to provide a tire mold and a tire manufacturing method that can be improved.

[0012]

Means for Solving the Problems The present inventors have conducted intensive studies to solve the above-mentioned problems, and as a result, if the conditions of the molding vulcanization and the rubber material of the green tire are substantially constant, the reference vent hole When the diameter and the spew length obtained when the vent hole is applied, the diameter of the selected vent hole or the predetermined size of the opening of the selected micro vent piece, and when the vent hole or the micro vent piece is applied It has been found that the length of the obtained spew or rubber burr has a certain relationship, and the present invention has been completed.

That is, according to the present invention, there is provided a tire molding die having a vent hole, wherein the vent hole has a hole diameter determined by the following general formula (1). (Hereinafter sometimes referred to as “vent hole type”).

[0014]

Y ¹ = 5.662Y ² + 0.872X ¹ -4.967X ² -0.01 (1)

In the formula (1), Y ¹ is the predicted value of the spew length, Y ² is the hole diameter of the selected vent hole, and X ¹ is
Known spew length obtained by reference to the vent holes, X ² represents a pore size of reference the vent hole.
However, the rubber material and vulcanization molding conditions of the green tire are substantially constant. "

Further, according to the present invention, there is provided a tire molding die having a micro vent piece embedded in a vent hole, wherein the micro vent piece has an opening having a shape and a size determined by the following general formula (2). (Hereinafter, may be referred to as a “micro vent piece type”).

[0017]

Y ³ = (0.872X ³ −4.967Y ⁴ +9.049) × (0.038Y ⁵ + 2.792Y ⁶ + 0.020Y ⁷ −0.036Y ⁸ ) −0.216 (2)

In the formula (2), Y ³ is a predicted value of a rubber burr length, X ³ is a known spew length obtained from a reference vent hole, and Y ⁴ is a reference vent hole length. pore size, Y ^5, the opening length of the opening of the selected micro ventlid, Y ^6, the opening width of the opening of the selected micro ventlid, Y ^7, the opening area of the opening of the selected micro ventlid , Y ⁸ indicate the opening side area of the opening of the selected micro vent piece, provided that the rubber material of the green tire and the vulcanization molding conditions are substantially constant. ”

In the tire molding die of the present invention, the opening of the micro vent piece has a slit shape,
The shape may be any one of a circular shape and a groove shape.

On the other hand, according to the present invention, a tire molding die having a vent hole is pressed against a green tire, and air in a closed space formed between the tire molding die and the green tire is released from the vent hole. Tire vulcanization while removing through the process, wherein the vent hole has a suitable hole diameter based on the length of the spew formed in the vent hole predicted by the following general formula (1) (Hereinafter, may be referred to as “first manufacturing method”).

[0021]

Y ¹ = 5.662Y ² + 0.872X ¹ -4.967X ² -0.01 (1)

“In the formula (1), Y ¹ is a predicted value of the spew length, Y ² is the hole diameter of the selected vent hole, and X ¹ is
Known spew length obtained by reference to the vent holes, X ² represents a pore size of reference the vent hole.
However, the rubber material and vulcanization molding conditions of the green tire are substantially constant. "

Further, according to the present invention, a tire molding die in which a micro vent piece is embedded in a vent hole is pressed against a green tire, and a blockage formed between the tire molding die and the green tire. A tire manufacturing method for performing vulcanization molding while removing air in a space through an opening of a micro vent piece, the length of a burr formed in a vent hole predicted by the following general formula (2) Based on the above, a tire manufacturing method (hereinafter, sometimes referred to as a “second manufacturing method”) is provided in which the micro vent piece has a suitable opening (shape and size).

[0024]

Y ³ = (0.872X ³ −4.967Y ⁴ +9.049) × (0.038Y ⁵ + 2.792Y ⁶ + 0.020Y ⁷ −0.036Y ⁸ ) −0.216 (2)

In the formula (2), Y ³ is a predicted value of a rubber burr length, X ³ is a known spew length obtained by a reference vent hole, and Y ⁴ is a reference vent hole length. pore size, Y ^5, the opening length of the opening of the selected micro ventlid, Y ^6, the opening width of the opening of the selected micro ventlid, Y ^7, the opening area of the opening of the selected micro ventlid , Y ⁸ indicate the opening side area of the opening of the selected micro vent piece, provided that the rubber material of the green tire and the vulcanization molding conditions are substantially constant. ”

In the tire manufacturing method of the present invention, the opening of the micro vent piece is formed in a slit shape,
The shape may be any one of a circular shape and a groove shape.

[0027]

Hereinafter, embodiments of the present invention will be described.
This will be specifically described with reference to the drawings.

1. Vent Hole Type As shown in FIG. 1, the vent hole type tire molding die 2 of the present invention is a tire molding die 2 having a vent hole 1 as described above. It has a specific pore size. Hereinafter, a specific description will be given.

The vent hole 1 in the present invention means a small hole formed in a tire molding die and communicating between a closed space formed between the tire molding die and the green tire and the outside, It has a pore diameter determined by the following general formula (1).

[0030]

Y ¹ = 5.662Y ² + 0.872X ¹ -4.967X ² -0.01 (1)

“In the formula (1), Y ¹ is a predicted value of the spew length, Y ² is the hole diameter of the selected vent hole, and X ¹ is
Known spew length obtained by reference to the vent holes, X ² represents a pore size of reference the vent hole.
However, the rubber material and vulcanization molding conditions of the green tire are substantially constant. "

This makes it possible to easily and accurately control the length of the spew without specifically examining vulcanization molding conditions, rubber materials, and other conditions.

For example, using a tire molding die 2 having a vent hole 1 having a diameter of 1.6 mm, the tire is pressed against a green tire to perform vulcanization molding, and 14 mm at the center of the tire circumferential surface and 14 mm at the end. When a 25 mm spew 5a is formed, the vent hole 1 having a hole diameter suitable for setting the length of the spew to 10 mm irrespective of the position of the tire circumferential surface is determined by the above general formula (1) ) And can be designed as follows.

(A) Central part of circumferential surface

10 = 5.662Y ² + 0.872 × 14-4.967 × 1.6-0.01 (1-1) “In the formula (1-1), Y ² is a selected vent hole. Indicate the diameter. "

[0035]

[Expression 11] Y ² = 1.02 mm (1-2) “In the formula (1-2), Y ² represents the diameter of the selected vent hole.”

(B) End of circumferential surface

10 = 5.662Y ² + 0.872 × 25-4.967 × 1.6-0.01 (1-3) “In the formula (1-3), Y ² is a selected vent hole. Indicate the diameter. "

[0037]

Y ² = 0.09 (mm) (1-4) “In the formula (1-4), Y ² represents the diameter of the selected vent hole.”

The method for forming the vent hole 1 is not particularly limited. For example, as shown in FIG. 6, a method of forming a hole using a rotary tool 8 such as a drill; When the mold 2 is manufactured by casting, the mold 1
A cylindrical pin 9 having the same diameter as the inner diameter of the vent hole 1 is buried in a position corresponding to the vent hole 1 of the molding die 2 of the mold 0, and the pin 9 is cast into the molding die 2 which is a casting. After wrapping, a method of extracting the pin 9 and the like can be mentioned.

The hole diameter of the vent hole 1 can be determined by the above-mentioned general formula (1). However, from the viewpoint that drilling of the vent hole is possible and spew cutting after tire molding is easy, 0 is used. It is preferable to set the range of 0.6 to 2.0 mm.

The method of forming the tire molding die 2 itself is not particularly limited.
It can be produced by the methods described in the Patent Application No. 359905, the Japanese Patent Application No. 11-337280, the Japanese Patent Application No. 11-165023, and the Japanese Patent Application No. 10-273711.

As shown in FIG. 2, the tire molding die 2 of the present invention usually has a rib 14 having a convex shape corresponding to a rib groove extending in the tire circumferential direction and a lug groove extending in the tire width direction. And a blade 15 having a thin projection corresponding to the fine groove.

[0042] 2. Micro Vent Piece Type As shown in FIG. 3, the micro vent piece type tire molding die 2 of the present invention is a tire molding die in which a micro vent piece is embedded in a vent hole, as described above, This micro vent piece has an opening of a specific shape and size. Less than,
This will be specifically described.

The vent hole 1 is the same as the vent hole type described above, and can be formed in the same manner as the method described for the vent hole type.

The micro vent piece 7 is a member embedded in the vent hole 1, and is a tire molding die 2.
And a green tire (not shown) and an opening 7a that communicates between a closed space and an external space.

In the present invention, the opening 7a of the micro vent piece 7 is formed in a suitable shape and size based on the length of the burr formed in the vent hole 1 predicted by the following general formula (2). I do.

[0046]

Y ³ = (0.872X ³ −4.967Y ⁴ +9.049) × (0.038Y ⁵ + 2.792Y ⁶ + 0.020Y ⁷ −0.036Y ⁸ ) −0.216 (2)

“In the formula (2), Y ³ is a predicted value of a rubber burr length, X ³ is a known spew length obtained from a reference vent hole, and Y ⁴ is a reference vent hole length. pore size, Y ^5, the opening length of the opening of the selected micro ventlid, Y ^6, the opening width of the opening of the selected micro ventlid, Y ^7, the opening area of the opening of the selected micro ventlid , Y ⁸ indicate the opening side area of the opening of the selected micro vent piece, provided that the rubber material of the green tire and the vulcanization molding conditions are substantially constant. ”

Thus, the rubber material of the green rubber,
A length (1 mm) that does not require a cutting step (trimming) of rubber burrs without specifically investigating and examining the conditions of molding vulcanization
Below), the micro vent piece 7
The tire can be manufactured efficiently with almost no time required for adjusting the opening 7a.

For example, using a tire molding die 2 having a vent hole 1 having a diameter of 1.6 mm, vulcanization molding is performed by pressing against a green tire, and 14 mm at the center of the tire circumferential surface and 14 mm at the end. When a 25 mm spew is formed, the burr length is set to 1 at any spew formation position.
The micro vent piece 7 having a shape and a size suitable to be set to mm can be designed as follows.

(A) Center of Circumferential Surface First, the following formula (2-1) is obtained by substituting each numerical value into the above-described general formula (2).

[0051]

1 = (0.872 × 14−4.967 × 1.6 + 9.049) × (0.038Y ^Five + 2.792Y⁶+ 0.020Y⁷-0.036Y⁸) −0.216 (2-1)

“In the formula (2-1), Y ⁵ is the opening length of the opening of the selected micro vent piece, Y ⁶ is the opening width of the opening of the selected micro vent piece, and Y ⁷ is
Open area of the opening of the selected micro vent piece, Y
⁸ shows the area on the opening side of the opening of the selected micro vent piece. However, the rubber material of the green tire and the vulcanization molding conditions are substantially constant. "

Next, based on the equation (2-1), the opening width (Y ⁶ ) of the opening of the selected micro vent piece,
The opening area (Y ⁷ ) and the opening side area (Y ⁸ ) are shown in, for example, Table 1.
As shown in (1), the shape and the size of the opening are determined in sequence and are suitable.

[0054]

[Table 1]

(B) End of Circumferential Surface Like the central portion of the circumferential surface, first, each numerical value is substituted into the above-described general expression (2) to obtain the following expression (2-2).

[0056]

1 = (0.872 × 25−4.967 × 1.6 + 9.049) × (0.038Y ^Five + 2.792Y⁶+ 0.020Y⁷-0.036Y⁸) −0.216 (2-2)

“In the formula (2-2), Y ⁵ is the opening length of the opening of the selected micro vent piece, Y ⁶ is the opening width of the opening of the selected micro vent piece, and Y ⁷ is
Open area of the opening of the selected micro vent piece, Y
⁸ shows the area on the opening side of the opening of the selected micro vent piece. However, the rubber material and vulcanization molding conditions of the green tire are substantially constant. "

Next, based on the equation (2-2), the opening width (Y ⁶ ) of the opening of the selected micro vent piece,
The opening area (Y ⁷ ) and the opening side area (Y ⁸ ) are shown in, for example, Table 2.
As shown in (1), the shape and the size of the opening are determined in sequence and are suitable.

[0059]

[Table 2]

Here, as shown in FIGS. 8 to 7, the opening width 11 (Y ⁶ ) means the length of the opening in the short direction.
The opening length 12 (Y ⁵ ) means the length in the longitudinal direction of the opening, and the piece plate thickness 13 means the length in the thickness direction of the micro vent piece. The opening area (Y ⁷ ) is literally the area of the opening, that is, for example, if the opening has a slit shape, the opening width is 11 × the opening length 12, and if the opening is circular, the opening area is (the opening width). 11 or opening length 12 /
2) ² × means pi (π), and the opening area (Y ⁸ ) means the area of the side surface of the entire opening. For example, if the opening has a slit shape, ｛(2 × Opening length 12) +
(2 × opening width 11)｝ × piece thickness 13, if the opening is circular, opening width 11 or opening length 12 × circumference (π)
× means piece thickness 13

As the shape of the opening of the micro vent piece, a suitable shape can be appropriately selected according to the design of the mold for tire molding. For example, as shown in FIGS. , A groove shape or the like (hereinafter, also referred to as “slit type”, “circular type”, and “groove type”, respectively).
A slit type is preferred. As shown in FIG. 9, in the case of a circular type, the above-described general formula (2) may be applied by replacing the diameter with the opening width 11 and the opening length 12, and as shown in FIG. In the case of the type, the intersecting slits are considered as different slits, and the opening width 11 and the opening length 12 are obtained for each of them, and the above-described general formula (2) may be applied.

The opening width 11 can be obtained from a suitable numerical value by the general formula (2) described above.
It is preferable to select from the range of 0.01 mm to 0.05 mm, and it is more preferable to select from the range of 0.02 mm to 0.03 mm. Also, the opening length 12 can be obtained from a suitable numerical value by the above-mentioned general formula (2), but is preferably selected in the range of 0.2 mm to 0.7 mm, and is preferably 0.4 mm to 0 mm. More preferably, it is selected in the range of 0.6 mm. Also, the piece plate thickness 13 is not particularly limited, except that the opening side area (Y ⁷ ) in the general formula (2) has a suitable value. For example, the vent hole is closed with a thin plate. Any of those buried as described above and those formed into a hollow cylindrical shape with a thick plate and buried to the deep part of the vent hole may be used.
It is preferable to select within a range of 4 mm.

The method for manufacturing the micro vent piece 7 and the method for embedding the micro vent piece 7 are not particularly limited. For example, the method can be performed by the method described in Japanese Patent Application No. 11-359905.

1. First Manufacturing Method As shown in FIG. 4, a first manufacturing method of the present invention presses a tire molding die 2 having a vent hole 1 having a specific diameter against a green tire 3 to form a tire molding die. The vulcanization molding is performed while removing the air in the closed space 4 formed between the mold 2 and the green tire 3 through the vent hole 1. Hereinafter, a specific description will be given.

The vent hole 1 in the first manufacturing method
And the method of forming the same is the same as that described for the tire molding die. The vent hole 1 has a suitable hole diameter based on a predicted value of the length of the spew 5a formed in the vent hole 1 by the following general formula (1).

[0066]

Y ¹ = 5.662Y ² + 0.872X ¹ -4.967X ² -0.01 (1)

“In the formula (1), Y ¹ is a predicted value of the spew length, Y ² is the hole diameter of the selected vent hole, and X ¹ is
Known spew length obtained by reference to the vent holes, X ² represents a pore size of reference the vent hole.
However, the rubber material and vulcanization molding conditions of the green tire are substantially constant. "

Thus, the length of the spew 5 a can be controlled to a desired length without adjusting the rubber material of the green rubber 3 and the conditions of the molding vulcanization, and the diameter of the vent hole 1 can be adjusted. The spew 5a can be cut efficiently with almost no time required.

In the present invention, the green tire 3 is a tire made of an unpolymerized rubber material and having no tread pattern formed. The “material” of the green tire 3 is generally specified by the compounding agents shown in Table 3. Is what is done. However, the compounding ratios of the compounding agents shown in Table 3 are different for each tire (for example, the compounding ratio of synthetic rubber is large for general passenger cars, and small for rubber trucks and buses). The material of the green tire 3 is
There will be numerous types.

[0070]

[Table 3]

The difference in the material of the green tire 3 is as follows.
In general, it is necessary to specify the material when determining the length of the spew 5a, since the material affects the flow characteristics, viscoelasticity, and other characteristics of the rubber material. In the present invention, however, the material is specified. The length of the spew 5a can be controlled without any need.

The “vulcanization molding conditions” in the present invention include:
These are literally conditions for vulcanizing the green tire 3, and specifically include the pressing pressure of the tire molding die 2, vulcanization temperature, vulcanization time, vent hole diameter, and spew forming position.

In the present invention, the pressing pressure of the tire molding die 2 is not particularly limited.
It can be performed under conditions such as kgf / cm ² . still,
The pressure actually applied to the tire differs at the spew formation position (for example, at the center of the tire circumferential surface, at the end of the tire circumferential surface).

In the present invention, the vulcanization temperature and the vulcanization time are not particularly limited.
It can be carried out at 0 to 180 ° C. and vulcanization time of 10 to 60 (may be 24 hours) minutes.

The vulcanization molding conditions are as follows:
As in the case of the material, the length of the spew 5a usually needs to be specified when controlling the length of the spew 5a. In the present invention, the length of the spew 5a is controlled without specifying the condition. be able to.

2. Second Manufacturing Method A second manufacturing method of the present invention is to press a tire molding die 2 in which a micro vent piece 7 having a specific opening is embedded in a vent hole 1 against a green tire 3 to form a tire. The vulcanization molding is performed while removing the air in the closed space 4 formed between the mold 2 and the green tire 3 through the opening 7 a of the micro vent piece 7. Hereinafter, a specific description will be given.

Vent hole 1 in the second manufacturing method
And the method of forming the same is the same as that described for the tire molding die.

Further, the shape of the micro vent piece 7,
The size is the same as that described in the tire molding die, and the opening 7a of the micro vent piece 7 is
Based on the length of the burr 5b formed in the vent hole 1 predicted by the following general formula (2), a suitable shape and size are set.

[0079]

Y ³ = (0.872X ³ −4.967Y ⁴ +9.049) × (0.038Y ⁵ + 2.792Y ⁶ + 0.020Y ⁷ −0.036Y ⁸ ) −0.216 (2)

“In the formula (2), Y ³ is a predicted value of a rubber burr length, X ³ is a known spew length obtained from a reference vent hole, and Y ⁴ is a reference vent hole length. pore size, Y ^5, the opening length of the opening of the selected micro ventlid, Y ^6, the opening width of the opening of the selected micro ventlid, Y ^7, the opening area of the opening of the selected micro ventlid , Y ⁸ indicate the opening side area of the opening of the selected micro vent piece, provided that the rubber material of the green tire and the vulcanization molding conditions are substantially constant. ”

Thus, the desired burr length can be controlled without specifically examining and examining the rubber material of the green rubber 3 and molding vulcanization conditions. The tire can be manufactured efficiently with almost no time for adjustment.

The other items related to the shape and size of the micro vent piece 7, the method of manufacturing and embedding the same are the same as those described for the tire molding die. The green tire 3 and its material are the same as those in the first manufacturing method described above, and vulcanization molding conditions are the same as those in the first manufacturing method described above.

[0083]

EXAMPLES Hereinafter, the present invention will be described specifically with reference to Examples, but the present invention is not limited to these Examples.

1. Vent hole type (1) Predicted value of spew length The predicted value of spew length was determined by the following equation (1).

[0085]

Y ¹ = 5.662Y ² + 0.872X ¹ -4.967X ² -0.01 (1)

“In the equation (1), Y ¹ is a predicted value of the spew length, Y ² is the hole diameter of the selected vent hole, and X ¹ is
Known spew length obtained by reference to the vent holes, X ² represents a pore size of reference the vent hole.
However, the rubber material and vulcanization molding conditions of the green tire are substantially constant. "

(2) Examples Example 1 Using a tire molding die (material: S50C) having a vent hole having a diameter of 1.2 mm, a vulcanization temperature: 180 ° C.
Vulcanization time: 5 minutes, mold pressing pressure (the pressure applied to the mold, the actual pressure applied to the tire varies depending on the tire part): 50 kgf / cm ² , mold pressing time: 3 seconds, The green tire (material: PC rubber) was pressed and vulcanized, and the length of the spew at a specific position was determined. Next, the green tire was pressed and vulcanized under the same conditions using a tire molding die (material: S50C) having a vent hole having a diameter of 1.2 mm, and the length was determined as described above. The predicted value of the length of the spew formed at the same position as that of the spew was obtained. Finally, using this tire molding die, the green tire is actually pressed and vulcanized under the same conditions, and formed at the same position as the position of the spew whose length was determined as described above. The actual length of the spew was measured. The results are summarized in Table 4 and FIG.

Examples 2 to 4 In Example 1, the spews formed at different positions (the pressing pressure applied to the tire itself is different)
Except for obtaining the predicted value of the spew length and the actual measured value of the spew length in each mold, the predicted value and the measured value of the spew length were obtained in the same manner as in Example 1. The results are summarized in Table 4 and FIG.

Examples 5 to 150 In Example 1, the tire molding dies having the vent holes having the diameters shown in Tables 4 and 6 were used, and the spews formed at different positions were used. Pressure was different), the predicted value of the spew length, and the actual measured value of the spew length in each mold were determined in the same manner as in Example 1 except that the spew length when using each mold was used. The predicted value and the actually measured value were determined. The results are summarized in Tables 4 to 6 and FIG.

[0090]

[Table 4]

[0091]

[Table 5]

[0092]

[Table 6]

Example 151 Using a tire molding die (material: S50C) having a vent hole having a diameter of 1.2 mm, a vulcanization temperature: 150 ° C.
Vulcanization time: 10 minutes, mold pressing pressure (the pressure applied to the mold, the actual pressure applied to the tire varies depending on the part of the tire): 50 kgf / cm ² , mold pressing time: 3
In seconds, the green tire (material: PC rubber) was pressed and vulcanized, and the length of the spew at a specific position was determined. Then
A green tire was pressed and vulcanized under the same conditions using a tire molding die (material: S50C) having a vent hole having a diameter of 1.2 mm, and the length of the Spy was determined as described above. The predicted value of the length of the spew formed at the same position as the position was obtained. Finally, using this tire molding die, the green tire is actually pressed and vulcanized under the same conditions, and formed at the same position as the position of the spew whose length was determined as described above. The actual length of the spew was measured. The results are summarized in Table 7 and FIG.

Examples 152 to 154 In Example 151, for the spews formed at different positions (the pressing pressures applied to the tires themselves are different), the predicted values of the spew lengths and the spew lengths in the respective dies are described. Except that the measured value was determined, the predicted value and the measured value of the spew length were determined in the same manner as in Example 151. The results are summarized in Table 7 and FIG.

Examples 155 to 318 In Example 151, a tire molding die having vent holes having the diameters shown in Tables 7 to 8 was used, and spews formed at different positions (provided on the tire itself) Pressure) are different), the estimated value of the spew length,
A predicted value and a measured value of the spew length when each mold was used were obtained in the same manner as in Example 151, except that the measured value of the spew length in each mold was obtained. The results are summarized in Tables 7 to 9 and FIG.

[0096]

[Table 7]

[0097]

[Table 8]

[0098]

[Table 9]

Example 319 Using a tire molding die (material: S50C) having a vent hole having a diameter of 1.2 mm, a vulcanization temperature: 180 ° C.
Vulcanization time: 5 minutes, mold pressing pressure (the pressure applied to the mold, the actual pressure applied to the tire varies depending on the tire part): 50 kgf / cm ² , mold pressing time: 3 seconds, The green tire (material: TB rubber) was pressed and vulcanized, and the length of the spew at a specific position was determined. Next, the green tire was pressed and vulcanized under the same conditions using a tire molding die (material: S50C) having a vent hole having a diameter of 1.2 mm, and the length was determined as described above. The predicted value of the length of the spew formed at the same position as that of the spew was obtained. Finally, using this tire molding die, the green tire is actually pressed and vulcanized under the same conditions, and formed at the same position as the position of the spew whose length was determined as described above. The actual length of the spew was measured. The results are summarized in Table 10 and FIG.

Embodiments 320 and 321 In the embodiment 319, for the spews formed at different positions (the pressing pressure applied to the tire itself is different), the predicted value of the spew length, and the spew length of each mold Except that the measured value was obtained, the predicted value and the measured value of the spew length were obtained in the same manner as in Example 319. The results are summarized in Table 10 and FIG.

Examples 322 to 484 In Example 319, a tire molding die having vent holes having the diameters shown in Tables 10 to 11 was used, and spews formed at different positions were used. Pressure is different), the predicted value of the spew length, and the actual measured value of the spew length in each mold were determined in the same manner as in Example 319, except that the spew length when using each mold was determined. The predicted value and the actually measured value were determined. The results are summarized in Tables 10 to 12 and FIG.

[0102]

[Table 10]

[0103]

[Table 11]

[0104]

[Table 12]

Example 485 Using a tire molding die (material: S50C) having a vent hole having a diameter of 1.2 mm, a vulcanization temperature: 150 ° C.
Vulcanization time: 10 minutes, mold pressing pressure (the pressure applied to the mold, the actual pressure applied to the tire varies depending on the part of the tire): 50 kgf / cm ² , mold pressing time: 3
In seconds, the green tire (material: TB rubber) was pressed and vulcanized, and the length of the spew at a specific position was determined. Then
A green tire was pressed and vulcanized under the same conditions using a tire molding die (material: S50C) having a vent hole having a diameter of 1.2 mm, and the length of the Spy was determined as described above. The predicted value of the length of the spew formed at the same position as the position was obtained. Finally, using this tire molding die, the green tire is actually pressed and vulcanized under the same conditions, and formed at the same position as the position of the spew whose length was determined as described above. The actual length of the spew was measured. The results are summarized in Table 13 and FIG.

Examples 486 to 488 In Example 485, for the spews formed at different positions (different pressing pressures are applied to the tires themselves), the predicted values of the spew lengths and the spew lengths in the respective dies are described. Except that the measured value was determined, the predicted value and the measured value of the spew length were determined in the same manner as in Example 485. The results are summarized in Table 13 and FIG.

Examples 489 to 640 In Example 485, a tire molding die having vent holes having the diameters shown in Tables 13 to 14 was used, and spews formed at different positions (provided on the tire itself) Pressure was different), the predicted value of the spew length, and the actual measured value of the spew length in each mold were determined in the same manner as in Example 485, except that the spew length when using each mold was used. The predicted value and the actually measured value were determined. The results are summarized in Tables 13 to 15 and FIG.

[0108]

[Table 13]

[0109]

[Table 14]

[0110]

[Table 15]

Example 641 A predicted value of a tire molding die (material: S50C) having a vent hole having a diameter of 1.2 mm was obtained. Vulcanization temperature: 150 ° C., vulcanization time: 10 minutes, mold pressing pressure (the pressure applied to the mold, the actual pressure applied to the tire varies depending on the tire part): 50 kgf / cm ² ,
Mold pressing time: 3 seconds, green tire (Material C: PC
Rubber) was pressed and vulcanized, and the length of the spew at a specific position was determined. Next, a green tire was pressed and vulcanized under the same conditions using a tire molding die (material: S50C) having a vent hole having a diameter of 1.2 mm, and the length was determined as described above. The predicted value of the length of the spew formed at the same position as the spew position was determined. Finally, using this tire mold, under the same conditions,
The green tire was pressed and vulcanized, and the measured length of the spew formed at the same position as the spew whose length was determined as described above was determined. The results are shown in Table 16 and FIG.
Are shown together.

Examples 642 to 644 In Example 641, for the spews formed at different positions (different pressing pressures are applied to the tires themselves), the predicted values of the spew lengths and the spew lengths in the respective dies are described. Except that the measured value was obtained, the predicted value and the measured value of the spew length were obtained in the same manner as in Example 641. The results are summarized in Table 16 and FIG.

Examples 645 to 808 In Example 641, the tire molding die having the vent holes having the diameters shown in Tables 16 to 18 was used, and the spews formed at different positions were used. Pressure was different), the predicted value of the spew length, and the actual measured value of the spew length in each mold were determined in the same manner as in Example 641 except that the spew length when using each mold was used. The predicted value and the actually measured value were determined. The results are summarized in Tables 16 to 18 and FIG.

[0114]

[Table 16]

[0115]

[Table 17]

[0116]

[Table 18]

Example 809 Using a tire molding die (material: S50C) provided with a vent hole having a diameter of 1.2 mm, a vulcanization temperature: 135 ° C.
Vulcanization time: 20 minutes, mold pressing pressure (the pressure applied to the mold, the actual pressure applied to the tire varies depending on the part of the tire): 60 kgf / cm ² , mold pressing time: 3
In seconds, the green tire (material C: PC rubber) was pressed and vulcanized, and the length of the spew at a specific position was determined. Next, the green tire was pressed and vulcanized under the same conditions using a tire molding die (material: S50C) having a vent hole having a diameter of 1.2 mm, and the length was determined as described above. The predicted value of the length of the spew formed at the same position as that of the spew was obtained. Finally, using this tire molding die, the green tire is actually pressed and vulcanized under the same conditions, and formed at the same position as the position of the spew whose length was determined as described above. The actual length of the spew was measured. The results are summarized in Table 19 and FIG.

Examples 810 to 812 In Example 809, for spews formed at different positions (different pressing pressures are applied to the tires themselves), the predicted value of the spew length, and the spew length of each mold Except that the measured value was obtained, the predicted value and the measured value of the spew length were obtained in the same manner as in Example 809. The results are summarized in Table 19 and FIG.

Examples 813 to 1037 In Example 809, a tire molding die having a vent hole having a diameter shown in Tables 19 to 21 was used, and a spew formed at a different position was used. Pressure was different), the predicted value of the spew length, and the actual measured value of the spew length in each mold were determined in the same manner as in Example 809, except that the spew length when using each mold was used. The predicted value and the actually measured value were determined. The results are summarized in Tables 19 to 22 and FIG.

[0120]

[Table 19]

[0121]

[Table 20]

[0122]

[Table 21]

[0123]

[Table 22]

Example 1038 Using a tire molding die (material: S50C) provided with a vent hole having a diameter of 1.2 mm, a vulcanization temperature: 150 ° C.
Vulcanization time: 10 minutes, mold pressing pressure (the pressure applied to the mold, the actual pressure applied to the tire varies depending on the part of the tire): 60 kgf / cm ² , mold pressing time: 3
In seconds, the green tire (material D: TB rubber) was pressed and vulcanized to determine the length of the spew at a specific position. Next, a green tire was pressed and vulcanized under the same conditions using a tire molding die (material: S50C) having a vent hole having a diameter of 1.2 mm, and the length was determined as described above. The predicted value of the length of the spew formed at the same position as that of the spew was obtained. Finally, using this tire molding die, the green tire is actually pressed and vulcanized under the same conditions, and formed at the same position as the position of the spew whose length was determined as described above. The actual length of the spew was measured. The results are summarized in Table 23 and FIG.

Examples 1039 to 1041 In Example 1038, for spews formed at different positions (different pressing pressures are applied to the tires themselves), the predicted values of the spew length, and the Example 1038 except that the measured value was obtained.
In the same manner as in the above, the predicted value and the actually measured value of the spew length were obtained. The results are summarized in Table 23 and FIG.

Examples 1042 to 1109 In Example 1038, a tire molding die having a vent hole having a diameter shown in Table 23 was used, and a spew formed at a different position (press applied to the tire itself) Pressure is different), predicted spew length,
The predicted value and the measured value of the spew length when using each mold were obtained in the same manner as in Example 1038 except that the measured value of the spew length in each mold was obtained. The results are summarized in FIG. 23 and FIG.

[0127]

[Table 23]

(3) Evaluation As shown in FIG. 11, the predicted value based on the equation (1) in the present invention has an extremely high correlation (correlation coefficient (σ) =
0.9455), indicating that the predicted value based on equation (1) has extremely high accuracy.

[0129] 2. Micro vent piece type (1) Calculation of predicted value of burr length The predicted value of burr length was determined by the following equation (2).

[0130]

Y ³ = (0.872X ³ −4.967Y ⁴ +9.049) × (0.038Y ⁵ + 2.792Y ⁶ + 0.020Y ⁷ −0.036Y ⁸ ) −0.216 (2)

“In the formula (2), Y ³ is a predicted value of a rubber burr length, X ³ is a known spew length obtained by a reference vent hole, and Y ⁴ is a value of a reference vent hole. pore size, Y ^5, the opening length of the opening of the selected micro ventlid, Y ^6, the opening width of the opening of the selected micro ventlid, Y ^7, the opening area of the opening of the selected micro ventlid , Y ⁸ indicate the opening side area of the opening of the selected micro vent piece, provided that the rubber material of the green tire and the vulcanization molding conditions are substantially constant. ”

(2) Example A. Circular type Example 1110 Using a tire molding die (material: S50C) provided with a vent hole having a diameter of 1.6 mm, a vulcanization temperature: 180 ° C.
Vulcanization time: 5 minutes, mold pressing pressure (the pressure applied to the mold, the actual pressure applied to the tire varies depending on the tire part): 50 kgf / cm ² , mold pressing time: 3 seconds, The green tire (material: PC rubber) was pressed and vulcanized and molded, and the length of the arbitrarily selected spew was determined. Then, using a tire molding die in which a micro vent piece having a circular opening of 0.062 mm in diameter (opening length, opening width) with a piece thickness of 0.104 mm was embedded in a vent hole, under the same conditions. Then, the green tire was pressed and vulcanized, and a predicted value of the burr length formed at the same position as the position of the spew whose length was obtained as described above was obtained. Finally, using this tire molding die, the green tire is actually pressed and vulcanized under the same conditions, and formed at the same position as the position of the spew whose length was determined as described above. The actual measured value of the burr length was determined. The results are shown in Table 24 and FIG.
2 collectively.

Examples 1111 and 1112 In Example 1110, a tire molding die in which a micro vent piece having a piece plate thickness and an opening diameter (opening length and opening width) shown in Table 24 was embedded in a vent hole was used. Except that, the green tire was pressed and molded by each mold in the same manner as in Example 1110, and the spew length, the predicted value of the burr length and the actual measurement of the burr length when each mold was used. The value was determined. The results are summarized in Table 24 and FIG.

Examples 1113 to 1152 In Example 1110, a tire molding die in which a micro vent piece having a piece plate thickness and an opening diameter (opening length and opening width) shown in Table 24 was embedded in a vent hole was used. About the spews or burrs formed at different positions (Examples 4 to 11, Examples 12 to 15, Examples 16 to 19, Examples 20 to 23, Examples 35 to 37,
(Examples 38 to 40 and Examples 41 to 43 are the same, respectively), except that the length of the spew, the predicted value of the burr length, and the actually measured value of the burr length were obtained. The predicted and actual measured values of the spew length and burr length when using each mold were obtained. The results are shown in Table 24 and FIG.
2 collectively.

[0135]

[Table 24]

Example 1153 Using a tire molding die (material: S50C) provided with a vent hole having a diameter of 1.6 mm, a vulcanization temperature: 150 ° C.
Vulcanization time: 10 minutes, mold pressing pressure (the pressure applied to the mold, the actual pressure applied to the tire varies depending on the part of the tire): 50 kgf / cm ² , mold pressing time: 3
In seconds, the green tire (material: PC rubber) was pressed and the spew length was determined. Next, the piece thickness 0.1
03mm, diameter (opening length, opening width) 0.064mm
Under the same conditions, a green tire is pressed and vulcanized under the same conditions using a tire mold in which a micro vent piece having a circular opening is embedded in the vent hole, and the length is calculated as described above. The predicted value of the length of the burr formed at the same position as the above position was obtained. Finally, using this tire molding die, the green tire is actually pressed and vulcanized under the same conditions, and formed at the same position as the position of the spew whose length was determined as described above. The actual measured value of the burr length was determined. The results are summarized in Table 25 and FIG.

Examples 1154 to 1162 Examples 1153 were the same as Example 1153 except that a tire molding die in which a micro vent piece having a piece thickness and an opening diameter shown in Table 25 was embedded in a vent hole was used. The green tire was press-molded under the same conditions as described above, and the spew length and predicted value when each mold was used were determined. The results are summarized in Table 25 and FIG.

Examples 1163 to 1207 In Example 1153, a tire molding die in which a micro vent piece having a piece plate thickness and an opening diameter (opening length, opening width) shown in Table 25 was embedded in a vent hole was used. And the length of the spew (Examples 1163 to 1177, Examples 1178 to 1181, Examples 1182 to 1185,
Examples 1186 to 1190, Examples 1202 to 120
4, each of the molds was the same as in Example 1153 except that the estimated values of the burr length and the actual measured values of the burr length were obtained. The predicted value and the actually measured value of the spew length and burr length were determined. The results are summarized in Table 25 and FIG.

[0139]

[Table 25]

Example 1208 Using a tire molding die (material: S50C) provided with a vent hole having a diameter of 1.6 mm, a vulcanization temperature: 180 ° C.
Vulcanization time: 5 minutes, mold pressing pressure (the pressure applied to the mold, the actual pressure applied to the tire varies depending on the tire part): 50 kgf / cm ² , mold pressing time: 3 seconds, Press molded to green tire (material: TB rubber)
Spy length was determined. Next, a piece thickness of 0.104
pressing a green tire under the same conditions using a tire molding die in which a micro vent piece having a circular opening of 0.056 mm in diameter (opening length, opening width) is embedded in a vent hole, After vulcanization molding, the predicted value of the burr length formed at the same position as the position of the spew whose length was determined as described above was determined. Finally, using this tire molding die, the green tire is actually pressed and vulcanized under the same conditions, and formed at the same position as the position of the spew whose length was determined as described above. The actual measured value of the burr length was determined. The results are summarized in Table 26 and FIG.

Examples 1209 to 1214 Example 98 was the same as Example 1208 except that a tire forming die in which a micro vent piece having a piece thickness and an opening diameter shown in Table 26 was embedded in a vent hole was used. The green tire was press-molded under the same conditions as described above, and the measured and predicted values of the length of the spew and the length of the burr were obtained.
The results are summarized in Table 26 and FIG.

Examples 1215 to 1252 In Example 1208, a tire molding die in which a micro vent piece having a piece plate thickness and an opening diameter (opening length and opening width) shown in Table 26 was embedded in a vent hole was used. About spews or burrs formed at different positions (Examples 106 to 113, Examples 114 to 1)
17, Examples 118 to 121, Examples 122 to 126,
(Examples 138 to 140 and Examples 141 to 143 are the same.) The length of the spew was calculated in the same manner as in Example 1208 except that the predicted value and the measured value of the spew length and the burr length were obtained. The predicted value and the measured value of the burr length were obtained. The results are summarized in Table 26 and FIG.

[0143]

[Table 26]

Example 1253 Using a tire molding die (material: S50C) provided with a vent hole having a diameter of 1.6 mm, a vulcanization temperature: 150 ° C.
Vulcanization time: 10 minutes, mold pressing pressure (the pressure applied to the mold, the actual pressure applied to the tire varies depending on the part of the tire): 50 kgf / cm ² , mold pressing time: 3
In seconds, the green tire (material: TB rubber) was pressed and the spew length was determined. Next, the piece thickness 0.1
03mm, diameter (opening length, opening width) 0.057mm
Under the same conditions, a green tire is pressed and vulcanized under the same conditions using a tire mold in which a micro vent piece having a circular opening is embedded in the vent hole, and the length is calculated as described above. The predicted value of the length of the burr formed at the same position as the above position was obtained. Finally, using this tire molding die, the green tire is actually pressed and vulcanized under the same conditions, and formed at the same position as the position of the spew whose length was determined as described above. The actual measured value of the burr length was determined. The results are summarized in Table 27 and FIG.

Examples 1254 to 1264 Example 1253 was the same as Example 1253 except that a tire forming die in which a micro vent piece having a piece plate thickness and an opening diameter shown in Table 27 was embedded in a vent hole was used. The green tire was press-molded under the same conditions as described above, and the measured and predicted values of the length of the spew and the length of the burr were obtained. The results are summarized in Table 27 and FIG.

Examples 1265 to 1307 In Example 1253, a tire molding die in which a micro vent piece having a piece plate thickness and an opening diameter (opening length and opening width) shown in Table 27 was embedded in a vent hole was used. About spews or burrs formed at different positions (Examples 1265 to 1272, Example 127
3 to 1275, Examples 1276 to 1279, Example 12
80 to 1283, Examples 1284 to 1287, Example 1
299 to 1301, Examples 1302 to 1304, and Examples 1305 to 1307 are the same), and the same as Example 1253 except that the predicted value and the measured value of the spew length, the burr length were obtained. The predicted and actual measured values of the spew length and burr length when using each mold were obtained. The results are summarized in Table 27 and FIG.

[0147]

[Table 27]

Example 1308 Using a tire molding die (material: S50C) provided with a vent hole having a diameter of 1.6 mm, a vulcanization temperature: 150 ° C.
Vulcanization time: 10 minutes, mold pressing pressure (the pressure applied to the mold, the actual pressure applied to the tire varies depending on the part of the tire): 60 kgf / cm ² , mold pressing time: 1
After 80 seconds, the green tire (material: PC rubber) was pressed and molded, and the spew length was determined. Next, a piece thickness of 0.
100mm, diameter (opening length, opening width) 0.100m
Using a tire molding die in which a micro vent piece having a circular opening of m was embedded in the vent hole, the green tire was pressed and vulcanized under the same conditions, and the length was determined as described above. The predicted value of the burr length formed at the same position as the spew position was obtained. Finally, using this tire molding die, the green tire is actually pressed and vulcanized under the same conditions, and formed at the same position as the position of the spew whose length was determined as described above. The actual measured value of the burr length was determined. The results are summarized in Table 28 and FIG.

Examples 1309 to 1313 Example 1308 was the same as Example 1308, except that a tire forming die in which a micro vent piece having a piece thickness and an opening diameter shown in Table 28 was embedded in a vent hole was used. The green tire was press-molded under the same conditions as described above, and the measured and predicted values of the length of the spew and the length of the burr were obtained. The results are summarized in Table 28 and FIG.

Examples 1314 to 1371 In Example 1308, a tire molding die in which a micro vent piece having a piece thickness and an opening diameter (opening length and opening width) shown in Table 28 was embedded in a vent hole was used. The spews or burrs formed in different positions (Examples 1314-1322, Example 132
3-1328, Examples 1329-1330, Example 13
31 to 1334, Examples 1339 to 1342, Example 1
343 to 1346, Examples 1347 to 1350, Examples 1363 to 1365, Examples 1366 to 1368, and Examples 1369 to 1371 are the same), the predicted values and the measured values of the spew length and the burr length are obtained. Except for this, in the same manner as in Example 1308, predicted values and measured values of the spew length and the burr length when using each mold were obtained. The results are summarized in Table 28 and FIG.

[0151]

[Table 28]

Example 1372 Using a tire molding die (material: S50C) having a vent hole with a diameter of 1.6 mm, the vulcanization temperature was 135 ° C.
Vulcanization time: 20 minutes, mold pressing pressure (the pressure applied to the mold, the actual pressure applied to the tire varies depending on the tire portion): 60 kgf / cm ² , mold pressing time: 1
After 80 seconds, the green tire (material: PC rubber) was pressed and molded, and the spew length was determined. Then, piece thickness 2
0.00mm, diameter (opening length, opening width) 1.200
Using a tire molding die in which a micro vent piece having a circular opening of mm was embedded in the vent hole, under the same conditions, the green tire was pressed and vulcanized, and the length was determined as described above. The predicted value of the burr length formed at the same position as the spew position was obtained. Finally, using this tire molding die, the green tire is actually pressed and vulcanized under the same conditions, and formed at the same position as the position of the spew whose length was determined as described above. The actual measured value of the burr length was determined. The results are summarized in Table 29 and FIG.

Examples 1373 to 1375 Example 1372 was the same as Example 1372 except that a tire molding die in which a micro vent piece having a piece thickness and an opening diameter shown in Table 29 was embedded in a vent hole was used. The green tire was press-molded under the same conditions as described above, and the measured and predicted values of the length of the spew and the length of the burr were obtained. The results are summarized in Table 29 and FIG.

Examples 1376 to 1387 In Example 1372, a tire molding die in which a micro vent piece having a piece plate thickness and an opening diameter (opening length and opening width) shown in Table 29 was embedded in a vent hole was used. And examples of spews or burrs formed at different positions (Examples 1376 to 1379, Example 138)
0 to 1383 are the same), except that the predicted and actual measured values of the spew length and the burr length were obtained.
In the same manner as in Example 1372, predicted values and measured values of the spew length and the burr length when using each mold were obtained. The results are summarized in Table 29 and FIG.

[0155]

[Table 29]

Example 1388 Using a tire molding die (material: S50C) provided with a vent hole having a diameter of 1.6 mm, a vulcanization temperature: 150 ° C.
Vulcanization time: 10 minutes, mold pressing pressure (the pressure applied to the mold, the actual pressure applied to the tire varies depending on the part of the tire): 60 kgf / cm ² , mold pressing time: 1
After 80 seconds, the green tire (material C: PC rubber) was pressed and molded, and the spew length was determined. Next, with a piece plate thickness of 0.200 mm and a diameter (opening length, opening width) of 0.06
Under the same conditions, a green tire was pressed and vulcanized under the same conditions using a tire molding die in which a micro vent piece having a circular opening of 0 mm was embedded in the vent hole, and the length was determined as described above. The predicted value of the burr length formed at the same position as the spew position was obtained. Finally, using this tire molding die, the green tire is actually pressed and vulcanized under the same conditions, and formed at the same position as the position of the spew whose length was determined as described above. The actual measured value of the burr length was determined. The results are summarized in Table 30 and FIG.

Examples 1389 and 1390 Examples 1388 and 1390 were the same as Example 1388, except that a tire molding die in which a micro vent piece having a piece thickness and an opening diameter shown in Table 30 was embedded in a vent hole was used. The green tire was press-molded under the same conditions as described above, and the measured and predicted values of the length of the spew and the length of the burr were obtained. The results are summarized in Table 30 and FIG.

Examples 1391, 1392 In Example 1388, a tire molding die in which a micro vent piece having a piece plate thickness and an opening diameter (opening length, opening width) shown in Table 30 was embedded in a vent hole was used. For the spews or burrs formed at different positions (the same between Example 1391 and 1392, respectively), the lengths of the spews and the predicted values and the measured values of the burr lengths were obtained. In the same manner as in Example 1388, the predicted value and the measured value of the spew length and the burr length when using each mold were obtained. The results are summarized in Table 30 and FIG.

[0159]

[Table 30]

B. Slit type Example 1393 Using a tire molding die (material: S50C) provided with a vent hole having a diameter of 1.6 mm, a vulcanization temperature: 180 ° C.
Vulcanization time: 5 minutes, mold pressing pressure (the pressure applied to the mold, the actual pressure applied to the tire varies depending on the tire part): 50 kgf / cm ² , mold pressing time: 3 seconds, The green tire (material: PC rubber) was pressed and vulcanized and molded, and the length of the arbitrarily selected spew was determined. Next, a piece plate thickness of 0.105 mm and an opening length of 1.890
mm, pressing a green tire, vulcanizing and molding under the same conditions using a tire molding die in which a micro vent piece having a slit-shaped opening with an opening width of 0.020 mm is embedded in a vent hole. Thus, the predicted value of the burr length formed at the same position as the position of the spew whose length was obtained was obtained. Finally, using this tire mold,
Actually, under the same conditions, the green tire was pressed and vulcanized, and the measured value of the burr length formed at the same position as the position of the spew whose length was obtained as described above was obtained. The results are summarized in Table 31 and FIG.

Examples 1394 to 1397 In Example 1393, a mold for tire molding was used in which a micro vent piece having a piece plate thickness and an opening (opening length, opening width) shown in Table 31 was embedded in a vent hole. Except for this, the green tire was pressed under the same conditions as in Example 1393, and the measured and predicted values of the spew length and the burr length were obtained. The results are summarized in Table 31 and FIG.

Examples 1398 to 1459 In Example 1393, a tire molding die in which a micro vent piece having a piece thickness and an opening (opening length and opening width) shown in Table 31 was embedded in a vent hole was used. And about spews or burrs formed at different positions (Examples 1398 to 1404, Examples 1405 to 1404)
1412, Examples 1413 to 1419, Example 1420
-1425, Examples 1426-1432, Example 143
3-1438, Examples 1439-1441, Example 14
42 to 1444, Examples 1445 to 1447, Example 1
448 to 1450, Examples 1451 to 1453, Examples 1454 to 1456, and Examples 1457 to 1459 are the same), except that the predicted value and the measured value of the length of the spew and the length of the burr were obtained. In the same manner as in Example 1393, predicted values and measured values of the spew length and the burr length were obtained. The results are summarized in Table 31 and FIG.

[0163]

[Table 31]

Example 1460 Using a tire molding die (material: S50C) provided with a vent hole having a diameter of 1.6 mm, a vulcanization temperature: 150 ° C.
Vulcanization time: 10 minutes, mold pressing pressure (the pressure applied to the mold, the actual pressure applied to the tire varies depending on the part of the tire): 50 kgf / cm ² , mold pressing time: 3
In seconds, the green tire (material: PC rubber) was pressed and the spew length was determined. Next, the piece thickness 0.1
05mm, opening length 2.035mm, opening width 0.02
Under the same conditions, a green tire is pressed and vulcanized under the same conditions using a tire molding die in which a micro vent piece having a slit-shaped opening of 8 mm is embedded in the vent hole, and the length is determined as described above. The predicted value of the burr length formed at the same position as that of the spew was calculated. Finally,
Using this tire molding die, under the same conditions, the green tire is pressed and vulcanized under the same conditions, and the burr length is formed at the same position as the position of the spew whose length is determined as described above. The actual measured value was obtained. The results are summarized in Table 32 and FIG.

Examples 1461 to 1464 In Example 1460, a tire molding die in which a micro vent piece having a piece thickness and an opening (opening length and opening width) shown in Table 32 was embedded in a vent hole was used. Except for this, the green tire was pressed under the same conditions as in Example 1460, and the measured and predicted values of the length of the spew and the length of the burr were obtained. The results are summarized in Table 32 and FIG.

Examples 1465 to 1540 In Example 1460, a tire molding die in which a micro vent piece having a piece thickness and an opening (opening length and opening width) shown in Table 32 was embedded in a vent hole was used. And about spews or burrs formed at different positions (Examples 1465 to 1472, Example 1473,
1474, Examples 1475 to 1480, Example 1481
-1490, Examples 1492-1497, Example 149
8 to 1506, Examples 1507 to 1513, Example 15
14 to 1516, Examples 1517 to 1519, Example 1
520 to 1522, Examples 1523 to 1525, Examples 1526 to 1528, Examples 1529 to 1531, Examples 1532 to 1534, Examples 1535 to 1537, and Examples 1538 to 1540).
Except that the predicted value and the measured value of the spew length and the burr length were obtained, the predicted value and the measured value of the spew length and the burr length were obtained in the same manner as in Example 1460. Table 3 shows the results
2 and FIG.

[0167]

[Table 32]

Example 1541 Using a tire molding die (material: S50C) provided with a vent hole having a diameter of 1.6 mm, a vulcanization temperature: 180 ° C.
Vulcanization time: 5 minutes, mold pressing pressure (the pressure applied to the mold, the actual pressure applied to the tire varies depending on the tire part): 50 kgf / cm ² , mold pressing time: 3 seconds, Press molded to green tire (material: TB rubber)
Spy length was determined. Next, a piece thickness of 0.107
mm, opening length 1.965 mm, opening width 0.039 m
Under the same conditions, a green tire was pressed and vulcanized under the same conditions using a tire molding die in which a micro vent piece having a slit-shaped opening was embedded in the vent hole, and the length was determined as described above. The predicted value of the burr length formed at the same position as that of the spew was calculated. Finally,
Using this tire molding die, under the same conditions, the green tire is pressed and vulcanized under the same conditions, and the burr length is formed at the same position as the position of the spew whose length is determined as described above. The actual measured value was obtained. The results are summarized in Table 33 and FIG.

Example 1542 Except that in Example 1541, a tire molding die in which a micro vent piece having a piece plate thickness, an opening opening length, and an opening width shown in Table 33) was embedded in a vent hole was used. The green tire was pressed under the same conditions as in Example 1541, and the measured and predicted values of the length of the spew and the length of the burr were obtained. The results are summarized in Table 33 and FIG.

Examples 1543 to 1605 In Example 1541, a tire molding die in which a micro vent piece having a piece plate thickness and an opening diameter (opening length, opening width) shown in Table 33 was embedded in a vent hole was used. And about spews or burrs formed at different positions (Examples 1545 to 1550, Example 155)
1, 1552, Examples 1553-1562, Example 15
63-1566, Examples 1567-1569, Example 1
570 to 1576, Examples 1577 to 1581, Examples 1582 to 1584, Examples 1585 to 1587, Examples 1588 and 1589, Examples 1590 to 1593, Examples 1594 to 1596, Examples 1597 to 1599,
Examples 1600 to 1602, Examples 1603 to 1605
Example 15 except that the length of the spew, the predicted value of the burr length, and the measured value were obtained.
In the same manner as in No. 41, the predicted value and the measured value of the spew length and the burr length were obtained. The results are summarized in Table 33 and FIG.

[0171]

[Table 33]

Example 1606 Using a tire molding die (material: S50C) provided with a vent hole having a diameter of 1.6 mm, a vulcanization temperature: 150 ° C.
Vulcanization time: 10 minutes, mold pressing pressure (the pressure applied to the mold, the actual pressure applied to the tire varies depending on the part of the tire): 50 kgf / cm ² , mold pressing time: 3
In seconds, the green tire (material: TB rubber) was pressed and the spew length was determined. Next, the piece thickness 0.1
03mm, opening length 1.985mm, opening width 0.02
Under the same conditions, a green tire is pressed and vulcanized under the same conditions using a mold for molding a tire in which a micro vent piece having a 2 mm slit-shaped opening is embedded in the vent hole, and the length is determined as described above. The predicted value of the burr length formed at the same position as that of the spew was calculated. Finally,
Using this tire molding die, under the same conditions, the green tire is pressed and vulcanized under the same conditions, and the burr length is formed at the same position as the position of the spew whose length is determined as described above. The actual measured value was obtained. The results are summarized in Table 34 and FIG.

Examples 1607 to 1611 In Example 1606, a tire molding die in which a micro vent piece having a piece thickness and an opening (opening length and opening width) shown in Table 34 was embedded in a vent hole was used. Except for this, the green tire was pressed under the same conditions as in Example 1606, and the actual measured value and the predicted value of the spew length and the burr length were obtained. The results are summarized in Table 34 and FIG.

Examples 1612 to 1672 In Example 1606, a mold for tire molding was used in which a micro vent piece having a piece thickness and an opening (opening length, opening width) shown in Table 34 was embedded in a vent hole. And spews or burrs formed at different positions (Examples 1612 to 1619, Examples 1621 to 1621)
1626, Examples 1627 to 1632, Example 1633
-1635, Examples 1636, 1637, Example 163
8 to 1646, Examples 1647 to 1651, Example 16
52 to 1654, Examples 1655 to 1657, Example 1
658 to 1660, the examples 1661 to 1663, the examples 1664 to 1666, the examples 1667 to 1669, and the examples 1670 to 1672 are the same). Except for this, the predicted values and the measured values of the spew length and the burr length were obtained in the same manner as in Example 1606. Table 3 shows the results
4 and FIG.

[0175]

[Table 34]

Example 1673 Using a tire forming mold (material: S50C) provided with a vent hole having a diameter of 1.6 mm, a vulcanization temperature: 135 ° C.
Vulcanization time: 20 minutes, mold pressing pressure (the pressure applied to the mold, the actual pressure applied to the tire varies depending on the tire portion): 60 kgf / cm ² , mold pressing time: 1
After 80 seconds, the green tire (material: PC rubber) was pressed and molded, and the spew length was determined. Next, a piece thickness of 0.
100 mm, opening length 2.000 mm, opening width 0.0
Using a tire molding die in which a micro vent piece having a 40 mm slit-shaped opening is embedded in the vent hole, under the same conditions, the green tire is pressed and vulcanized, and the length is determined as described above. The predicted value of the burr length formed at the same position as that of the spew was calculated. Finally, using this tire molding die, the green tire is actually pressed and vulcanized under the same conditions, and formed at the same position as the position of the spew whose length was determined as described above. The actual measured value of the burr length was determined. The results are shown in Table 35 and FIG.
Are shown together.

Examples 1674 to 1707 In Example 1673, a tire molding die in which a micro vent piece having a piece thickness and an opening (opening length and opening width) shown in Table 35 was embedded in a vent hole was used. And spews or burrs formed at different positions (Examples 1674 to 1676, Example 1677,
1678, Examples 1680 to 1682, Example 1683
~ 1689, Examples 1690 ~ 1692, Example 169
3 to 1695, Examples 1696 to 1698, Example 16
99-1701, Examples 1702-1704, Example 1
705 to 1707), and the predicted values of the spew length and the burr length were obtained in the same manner as in Example 1673 except that the predicted value and the measured value of the spew length and the burr length were obtained. And measured values. The results are summarized in Table 35 and FIG.

[0178]

[Table 35]

Example 1708 Using a tire molding die (material: S50C) provided with a vent hole having a diameter of 1.6 mm, a vulcanization temperature: 135 ° C.
Vulcanization time: 20 minutes, mold pressing pressure (the pressure applied to the mold, the actual pressure applied to the tire varies depending on the tire portion): 60 kgf / cm ² , mold pressing time: 1
At 80 seconds, the green tire (material: TB rubber) was pressed and molded, and the spew length was determined. Next, a piece thickness of 0.
100 mm, opening length 2.000 mm, opening width 0.0
Under the same conditions, a green tire is pressed and vulcanized under the same conditions using a tire molding die in which a micro vent piece having a 20 mm slit-shaped opening is embedded in the vent hole, and the length is determined as described above. The predicted value of the burr length formed at the same position as that of the spew was calculated. Finally, using this tire molding die, the green tire is actually pressed and vulcanized under the same conditions, and formed at the same position as the position of the spew whose length was determined as described above. The actual measured value of the burr length was determined. The results are shown in Table 36 and FIG.
Are shown together.

Examples 1709 to 1738 In Example 1708, a tire molding die was used in which a micro vent piece having a piece thickness and an opening (opening length, opening width) shown in Table 36 was embedded in a vent hole. And spews or burrs formed at different positions (Examples 1709 to 1711, 1712 to 1712)
1714, Examples 1716 to 1720, Example 1721
To 1723, Examples 1724 to 1726, Example 172
7-1729, Examples 1730-1732, Example 17
Example 17 is the same as Example 17 except that the spew length, the predicted value of the burr length, and the measured value of the burr length were obtained.
08, the spew length when using each mold,
The predicted value and the measured value of the burr length were obtained. The results are summarized in Table 36 and FIG.

[0181]

[Table 36]

(3) Evaluation As shown in FIG. 12, the predicted value based on the equation (2) in the present invention has an extremely high correlation (correlation coefficient (σ) =
0.988), which indicates that the predicted value based on the equation (2) has extremely high accuracy.

[0183]

As described above, according to the tire manufacturing method of the present invention, the length of the spew or rubber burr generated during tire manufacturing can be easily and accurately controlled, and the manufacturing efficiency can be improved. It is possible to provide a tire molding die and a tire manufacturing method.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view schematically showing one embodiment of a venthole type tire molding die according to the present invention.

FIG. 2 is a plan view schematically showing one embodiment of a venthole type tire molding die according to the present invention.

FIG. 3 is a cross-sectional view and a partially enlarged view schematically showing one embodiment of a micro-vent piece type tire molding die of the present invention.

FIG. 4 is a cross-sectional view schematically showing one embodiment of a first manufacturing method.

FIG. 5 is a cross-sectional view and a partially enlarged view schematically showing one embodiment of a second manufacturing method.

FIG. 6 is an explanatory view schematically showing an example of a method of forming a vent hole in a first manufacturing method.

FIG. 7 is an explanatory view schematically showing another example of a method of forming a vent hole in the first manufacturing method.

FIG. 8 is an explanatory view schematically showing one example of a micro vent piece used in the second manufacturing method, wherein (a) is
(B) is a side view.

FIG. 9 is an explanatory view schematically showing another example of the micro vent piece used in the second manufacturing method, and FIG.
Is a front view, and (b) is a side view.

FIG. 10 is an explanatory view schematically showing another example of the micro vent piece used in the second manufacturing method, and FIG.
Is a front view, and (b) is a side view.

FIG. 11 is a correlation diagram showing a relationship between an actual measured spew length value and a predicted spew length value in the first manufacturing method.

FIG. 12 is a correlation diagram showing a relationship between a measured burr length value and a predicted burr length value in a second manufacturing method (circular type, slit shape type).

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... vent hole, 2 ... tire molding die, 3 ... green tire, 4 ... closed space, 5a ... spew, 5b ... burr, 6 ... bone (blade), 7 ... micro vent piece,
7a: opening, 8: rotating tool, 9: pin, 10: mold,
11 ... opening width, 12 ... opening length, 13 ... piece thickness, 1
4 ... bone, 15 ... blade, 20 ... air.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) B29L 30:00 B29L 30:00

Claims (6)

[Claims] 1. A tire molding die having a vent hole, wherein the vent hole has a hole diameter determined by the following general formula (1). Y ¹ = 5.662Y ² + 0.872X ¹ -4.967X ² -0.01 (1) “In the equation (1), Y ¹ is a predicted value of the spew length, and Y ² is
The selected vent hole diameter, X ^1, is the known spew length obtained by the reference vent hole, and X ² is
The hole diameter of the vent hole as a reference is shown. However, the rubber material and vulcanization molding conditions of the green tire are substantially constant. " 2. A tire molding die having a micro vent piece embedded in a vent hole, wherein the micro vent piece has an opening having a shape and a size determined by the following general formula (2). Tire mold. Y ³ = (0.872X ³ −4.967Y ⁴ +9.049) × (0.038Y ⁵ + 2.792Y ⁶ + 0.020Y ⁷ −0.036Y ⁸ ) −0.216 (2) In the equation (2), Y ³ is a predicted value of a rubber burr length, and X ³ is
The known spew length obtained by the reference vent hole, Y ⁴ is the hole diameter of the reference vent hole, and Y ⁵ is
Opening length of selected microvent piece opening, Y
⁶ indicates the opening width of the opening of the selected micro vent piece, Y ⁷ indicates the opening area of the opening of the selected micro vent piece, and Y ⁸ indicates the opening side area of the opening of the selected micro vent piece. However, the rubber material and vulcanization molding conditions of the green tire are substantially constant. " 3. An opening of the micro vent piece,
The tire molding die according to claim 2, which has any one of a slit shape, a circular shape, and a groove shape. 4. A tire molding die having a vent hole is pressed against a green tire, and air in a closed space formed between the tire molding die and the green tire is removed through the vent hole. A tire manufacturing method for performing vulcanization molding while performing vulcanization molding, wherein the vent hole has a suitable hole diameter based on a length of a spew formed in the vent hole, which is predicted by the following general formula (1). Characteristic tire manufacturing method. Y ¹ = 5.662Y ² + 0.872X ¹ -4.967X ² -0.01 (1) “In the equation (1), Y ¹ is a predicted value of the spew length, and Y ² is
The selected vent hole diameter, X ^1, is the known spew length obtained by the reference vent hole, and X ² is
The hole diameter of the vent hole as a reference is shown. However, the rubber material of the green tire and the vulcanization molding conditions are substantially constant. " 5. A tire molding die in which a micro vent piece is embedded in a vent hole is pressed against a green tire, and air in a closed space formed between the tire molding die and the green tire is released. A vulcanization molding while removing through an opening of the micro vent piece, based on a length of a burr formed in the vent hole, which is predicted by the following general formula (2). A method for manufacturing a tire, wherein the micro vent piece has a suitable opening (shape and size). Y ³ = (0.872X ³ −4.967Y ⁴ +9.049) × (0.038Y ⁵ + 2.792Y ⁶ + 0.020Y ⁷ −0.036Y ⁸ ) −0.216 (2) In the equation (2), Y ³ is a predicted value of a rubber burr length, and X ³ is
The known spew length obtained by the reference vent hole, Y ⁴ is the hole diameter of the reference vent hole, and Y ⁵ is
Opening length of selected microvent piece opening, Y
⁶ indicates the opening width of the opening of the selected micro vent piece, Y ⁷ indicates the opening area of the opening of the selected micro vent piece, and Y ⁸ indicates the opening side area of the opening of the selected micro vent piece. However, the rubber material of the green tire and the vulcanization molding conditions are substantially constant. " 6. An opening of the micro vent piece,
The tire manufacturing method according to claim 5, wherein the tire has a slit shape, a circular shape, or a groove shape.