JP3354601B2 - Extrusion die insert in extruder and method of extruding band material containing reinforcing cord using extrusion die insert - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an extrusion die insert in an extruder and a method for extruding a belt-shaped material containing a reinforcement cord using the extrusion die insert. The present invention relates to an extrusion die insert in an extruder capable of coating and a method of extruding a band material containing a reinforcing cord using the extrusion die insert.

[0002]

2. Description of the Related Art In recent years, the arrangement density of reinforcing cords has been increased in order to increase the strength of tires and maintain the same strength while forming a thin strip of reinforcing cord-containing material. By the way, conventionally, in an extruder for a belt-shaped material containing a reinforcing cord, as an extrusion die insert for coating (covering) a rubber material while extruding a reinforcing cord, for example, as shown in FIG. 7, an upper die 1a and a lower die 1b are used. At the opposing positions of the mating surfaces 2, semi-circular arc-shaped code slots 4 through which the reinforcing cords 3 are inserted at predetermined intervals H are formed.

[0003]

However, in the case of the conventional extrusion die insert as described above, the distance between the cord slots 4 is reduced in view of the difficulty in manufacturing the upper die 1a and the lower die 1b and the wear life. However, there is a problem that it is difficult to coat the rubber material by arranging the reinforcing cords 3 at a high density in the width direction of the belt-shaped material by using an extruder.

The present invention has been devised in view of such a conventional problem, and it is possible to arrange a reinforcing cord at a high density in a width direction of a strip-shaped material by using an extruder and cover it with a rubber material. Extrusion die inserts and reinforcement using extrusion die inserts in extruders that can increase the strength of the tire, form the belt-shaped material as a tire constituent material in a thin shape, and make it cheaper and easier to manufacture It is an object of the present invention to provide a method of extruding a cord-shaped band-shaped material.

[0005]

According to the present invention, in order to achieve the above object, a plurality of code slots provided in an upper die and a lower die are formed alternately at predetermined intervals in the upper die and the lower die. It is the gist. Further, the reinforcing cords are respectively inserted into a plurality of code slots formed alternately at predetermined intervals in the upper mold and the lower mold, and the front and back surfaces of the reinforcing cords arranged in the upper mold and the lower mold and the reinforcing cords. In the meantime, it is intended to cover the rubber material extruded from the extrusion head.

Further, reinforcing cords are respectively inserted into a plurality of cord slots formed alternately at predetermined intervals in the upper mold and the lower mold, and the front and back surfaces of the reinforcing cords arranged in the upper mold and the lower mold are respectively provided. A rubber material extruded from the extrusion head is coated between the reinforcement cords, and the formed band material containing the reinforcement cords is sandwiched by a molding roll provided at the tip of the extrusion head to align the reinforcement cords in series. The gist is that.

[0007]

According to the present invention, a reinforcing cord made of nylon, steel or the like is inserted into a plurality of cord slots formed alternately at predetermined intervals in an upper die and a lower die of an extrusion die insert. A long strip with a high-density reinforcement cord embedded by extruding and covering a rubber material of a certain thickness between the front and back surfaces of the reinforcement cords arranged in the upper and lower dies and between the reinforcement cords Materials can be manufactured.

[0008]

Embodiments of the present invention will be described below with reference to the accompanying drawings. The same components as those of the conventional example are denoted by the same reference numerals, and description thereof will be omitted. FIG. 1 is a cross-sectional view of an extrusion die insert comprising an upper die 1a and a lower die 1b embodying the present invention. At the interval of 3
Are formed in a semicircular arc-shaped cord slot 5.

FIG. 2 is a sectional view showing an extrusion die insert comprising the upper die 1a and the lower die 1b mounted on an extrusion head 6 of an extruder, and FIG. FIG. 3 is a partial cross-sectional view in the width direction of a band-shaped material W coated with a material 7. In the embodiment of the present invention, since the reinforcing cords 3 are arranged at high density in the width direction of the belt-shaped material W,
A semi-arc-shaped cord slot 5 is formed alternately on the mating surface 2 of the lower mold 1a and the lower mold 1b.

In the case of manufacturing the strip-shaped material W containing the reinforcing cord 3 by using the extrusion die insert mounted on the extrusion head 6 of the extruder, the upper die 1a and the lower die 1b are arranged at a predetermined interval. The reinforcing cords 3 made of nylon, steel or the like are respectively inserted through the plurality of cord slots 5 formed alternately, and the reinforcing cords 3 are aligned vertically in the width direction of the band-shaped material W. While pulling, push head 6 between front and back of reinforcing cord 3 and reinforcing cord 3.
The belt-like material W in which the reinforcing cords 3 are densely arranged in the width direction of the belt-like material W by covering the rubber material 7 extruded from
Can be manufactured.

FIGS. 4 and 5 show a second embodiment of the present invention. In this embodiment, an extrusion die insert comprising an upper die 1a and a lower die 1b is different from that of the first embodiment. Exactly the same thing is used, and a molding roll 8 is disposed vertically at the tip of an extrusion head 6 of an extruder. In the case of this embodiment, reinforcing cords 3 such as nylon and steel are respectively inserted into a plurality of cord slots 5 alternately formed at predetermined intervals in the upper mold 1a and the lower mold 1b.
With the reinforcing cords 3 aligned vertically in the width direction of the band-shaped material W, the rubber material 7 extruded from the extrusion head 6 is coated between the front and back surfaces of the reinforcing cords 3 and between the reinforcing cords 3 while pulling the tip of the reinforcing cords 3. Further, the band-shaped material W formed from the extrusion head 6 is clamped by upper and lower molding rolls 8.
As shown in FIG. 5, the reinforcing cords 3 are uniformly arranged in series in the width direction of the belt-shaped material W so as to be densely arranged, and the belt-shaped material W having a small thickness is formed.
Is formed.

FIG. 6 is a cross-sectional view showing a third embodiment of the extrusion die insert. In this embodiment, a semicircular arc-shaped cord groove is alternately formed on a mating surface 2 of an upper die 1a and a lower die 1b. When the hole 9 is formed, a deep code slot 9a and a shallow code slot 9b are formed in the upper mold 1a and the lower mold 1b.
As in the second embodiment, the reinforcing cords 3 are densely arranged in a staggered manner without using the upper and lower molding rolls 8 to form a thin band-shaped material W.

As described above, the reinforcing cords 3 made of nylon, steel or the like are inserted into the plurality of cord slots 5 alternately formed at predetermined intervals in the upper die 1a and the lower die 1b of the extrusion die insert.
Respectively, and a rubber material 7 having a constant thickness is extruded and covered between the front and back surfaces of the reinforcing cords 3 arranged in the upper die 1a and the lower die 1b and between the reinforcing cords 3 to thereby provide a high-density reinforcing cord. 3 can be manufactured, and a thin band material W having a small thickness while maintaining the same strength can be manufactured.
Thus, the tire can be molded, and the strength of the tire can be easily increased.

[0014]

As described above, according to the present invention, a plurality of cord slots provided in the upper die and the lower die of the extrusion die insert are alternately formed at predetermined intervals in the upper die and the lower die. It is possible to arrange the reinforcing cords at a high density by using a machine to cover and mold the rubber material, and to easily produce the upper and lower dies of the extrusion die insert, have a long wear life, and have an effect of being able to produce at low cost.

A reinforcing cord such as nylon, steel or the like is inserted into a plurality of cord slots formed alternately at predetermined intervals in an upper die and a lower die of the extrusion die insert, respectively.
Manufactures a long strip of material with a high-density reinforcement cord embedded by extruding and covering a rubber material of a certain thickness between the front and back surfaces of the reinforcement cords arranged in the upper and lower molds and between the reinforcement cords Therefore, the tire can be formed from a thin band-shaped material having the same strength and the thickness can be easily increased, and the strength of the tire can be easily increased.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of an extrusion die insert including an upper die and a lower die embodying the present invention.

FIG. 2 shows an extrusion die insert composed of an upper die and a lower die,
It is sectional drawing attached to the extrusion head of the extruder.

FIG. 3 is a partial cross-sectional view taken along the line AA of FIG. 2 in a width direction of a strip-shaped material in which a rubber material is coated on arranged reinforcing cords.

FIG. 4 is a sectional view showing a second embodiment of the present invention, in which an extrusion die insert including an upper die and a lower die is mounted on an extrusion head of an extruder.

FIG. 5 is a partial cross-sectional view taken along the line BB of FIG. 2 in the width direction of the band-shaped material in which the rubber material is coated on the arranged reinforcing cords.

FIG. 6 is a sectional view showing a third embodiment of an extrusion die insert including an upper die and a lower die.

FIG. 7 is a cross-sectional view of a conventional extrusion die insert including an upper die and a lower die.

[Explanation of symbols]

 1a Upper die 1b Lower die 2 Fitting surface 3 Reinforcement cord 5 Cord slot 6 Extrusion head 7 Rubber material 8 Molding roll W Strip material

Continuation of the front page (51) Int.Cl. ⁷ Identification code FI B29L 30:00 B29L 30:00 (56) References JP-A-4-43304 (JP, A) Jikai 58-64428 (JP, U) (58) Field surveyed (Int. Cl. ⁷ , DB name) B29C 47/00-47/96

Claims (3)

(57) [Claims] 1. A reinforcing material is inserted into a plurality of cord slots provided at predetermined intervals on a mating surface of an upper mold and a lower mold, and a rubber material is provided between the front and back surfaces of the arranged reinforcing cords and the reinforcing cords. In the extruder die insert in the extruder, the plurality of cord slots provided in the upper mold and the lower mold, the upper mold and the lower mold are formed alternately at predetermined intervals, characterized in that in the extruder Extrusion die insert. 2. A reinforcing cord is inserted into a plurality of cord slots formed alternately at predetermined intervals in an upper mold and a lower mold, respectively, and the front and back surfaces of the reinforcing cords arranged in the upper mold and the lower mold are respectively arranged. And a method of extruding a belt-like material containing a reinforcing cord using an extrusion die insert, wherein a rubber material extruded from an extrusion head is coated between the reinforcing cords. 3. A reinforcing cord is inserted through a plurality of cord slots formed alternately at predetermined intervals in an upper mold and a lower mold, respectively, and the front and back surfaces of the reinforcing cords arranged in the upper mold and the lower mold are provided. A rubber material extruded from the extrusion head is coated between the reinforcement cords, and the formed band material containing the reinforcement cords is sandwiched by a molding roll provided at the tip of the extrusion head to align the reinforcement cords in series. A method of extruding a reinforcing cord-containing band-shaped material using an extrusion die insert.