JP2000061999A - Manufacture of extrusion member having marking line and its apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To form a thin line with good accuracy even by applying colored rubber cement by using a particular shape of mouthpiece and a transfer roll. SOLUTION: Marking lines are transferred by a transfer roll 5 on the top surface of a projection 4 formed on the outer surface of an extrusion member 3 for tread rubber. The gap between the transfer roll 5 and the extrusion member 3 is appropriately selected within about 0. 75 to 2.5 mm in accordance with the height of the projection 4. The width of the marking lines are determined by the top width of the projection 4, since the transfer of the marking lines are conducted by contacting the transfer roll 5 to the top surface of the projection 4. As a result, the thinning processing of the marking lines are achieved without causing the conventional problem of clogging of a nozzle.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing an extruded member having marking lines (marking lines) and an apparatus therefor.

[0002]

2. Description of the Related Art Placing marking lines on an extruded member extruded from an extruder may be required when the final product is manufactured using the extruded member. For example, when a tread rubber is provided in a green case in a tire manufacturing process, a tread rubber provided with a marking line is used, and the two are aligned with the marking line as a reference. Therefore, such marking lines need to be accurately, thinly, and clearly inserted.

Conventionally, when putting a marking wire in a tread rubber, a marking wire has been put in a die of an extruder and a colored cement has been applied in accordance with the marking wire. As this application method, various methods such as a spray method, a spatula method, and a ring method are adopted. For example, as shown in FIG. 5, a color cement supply container 12 is provided on an extruded tread rubber 11, Container 1
The marker wire 14 was put in the tread rubber 11 through the nozzle 13 attached to the bottom of the No. 2.

[0004]

In any case, the conventionally used coating method of the marker line has the following problems, and it is not possible to accurately and finely insert the identification line.

That is, in the conventional method for manufacturing an extruded member having a marking line, the position of the extruded member fluctuates due to meandering of the extruded member. Therefore, in order to perform accurate positioning, the identification line is inserted immediately after the extruding. , There were restrictions on location. Even if a spatula type or nozzle type coating method is used, the width of the identification line is limited, and the minimum is 1.5 mm, which cannot be made thinner. This was due to the fact that the use of colored rubber cement caused the rubber component to harden due to drying and clogged the nozzle.
Further, there is a problem that maintenance is not easy when such clogging occurs.

Therefore, an object of the present invention is to provide a method and an apparatus for manufacturing an extruded member provided with a marking wire, which can insert a fine wire with high accuracy even if a colored rubber cement is applied.

[0007]

As a result of intensive studies to solve the above-mentioned problems, the present inventor has found that the above object can be achieved by using a die having a specific shape and a transfer roll. Came to complete the invention

That is, in the method for manufacturing an extruded member provided with a marking wire of the present invention, the notch formed in the die of the extruder forms a ridge extending in the longitudinal direction on the outer surface of the extruded member, Next, the marking line is transferred to the top surface of the ridge by a transfer roll.

In the present invention, the height of the ridge is preferably 0.75 to 2.5 mm, and the width of the bottom of the ridge is preferably 0.3 to 1.5 mm. Further, the gap between the transfer roll and the pushing member is preferably 0.75 to 2.5 mm.

The present invention also relates to an apparatus for manufacturing an extruded member provided with a marking wire, and the invention of this manufacturing apparatus includes an extruder having a notch formed in a die and an extruded member extruded from the extruder. A transfer roll for transferring the marking line is provided on the top surface of the ridge formed on the outer surface and extending in the longitudinal direction.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be specifically described below with reference to the drawings. FIG. 1 shows a plan view of a mouthpiece 1 of an extruder for tread rubber. The base 1 is provided with a notch 2 at a position corresponding to the position where the marker line is inserted in the tread. On the outer surface of the extruded member for tread rubber extruded through the die 1, a ridge extending in the longitudinal direction corresponding to the notch 2 is formed. As the shape of the cutout portion 2, for example, the shapes shown in FIGS. 2A to 2C can be used. Since the protrusion is formed in the notch portion 2 of the mouthpiece 1 in this way, it is possible to always insert the identification line at the prescribed position of the extrusion member, and there is no position variation. Such a ridge has a height of 0.75 to 2.5 m in view of the accuracy of the marking line and the thinning, as well as the workability of extrusion and the appearance of the product.
Preferably, the width of the bottom is 0.3 to 1.5 mm.

Then, as shown in FIG. 3, the marking line is transferred by the transfer roll 5 to the top surface of the protrusion 4 formed on the outer surface of the tread rubber extruding member 3. It is preferable that the gap between the transfer roll 5 and the pushing member 3 is appropriately selected within the range of 0.75 to 2.5 mm in accordance with the height of the protrusion 4.

Since the marking line is transferred by bringing the transfer roll 5 into contact with the top surface of the ridge 4, the width of the marking line is determined by the top width of the ridge 4. As a result, the marker line can be thinned without causing the problem of nozzle clogging as in the conventional case. Since the top width of the ridge 4 can be adjusted by the shape of the notch 2 of the mouthpiece 1, the thickness of the marker line can be freely changed by the mouthpiece, and a line of about 0.5 mm can be thinned.

Further, since the transfer roll 5 is a flat roll, even if the position of the extruding member 3 to be pushed out varies due to meandering, it can be absorbed within the width of the transfer roll 5. As a result, the marker line is always inserted in the protruding portion 4 of the pushing member 3, and the marker line can be inserted with extremely good accuracy.

The apparatus for manufacturing an extruded member of the present invention comprises an extruder having a notch formed in a die as shown in FIG. 1 and a transfer roll. Of these, the transfer roll is, for example, as shown in FIG. It can be installed on the extruding member 3 as shown in FIG. In FIG. 3, a colored rubber cement bath 6 is provided on the extruding member, and the colored rubber cement 7 is supplied to the transfer roll 5 through a plurality of sponge rolls 8, 9, and 10 in the bath 6. The colored rubber cement 7 supplied to the transfer roll 5 is transferred to the top of the protrusion 4 of the extruding member 3.

In the present invention, other conditions such as the type of colored rubber cement can be determined conventionally.

[0017]

EXAMPLES The present invention will be described below based on examples. Example A tire tread rubber was extruded using a die of the type shown in FIG. On the outer surface of the tread rubber extruding member extruded through the die, a ridge extending in the longitudinal direction corresponding to the notch 2 was formed. This ridge has a height of 0.8 mm, a top width of 0.5 mm, and a bottom width of 1.0 mm.
Met.

Then, as shown in FIG. 3, the marking line was transferred by the transfer roll 5 to the top surface of the protrusion 4 formed on the outer surface of the tread rubber extruding member 3. The gap between the transfer roll 5 and the pushing member 3 was set to 0.6 mm corresponding to the height of the protrusion 4.

Comparative Example As a comparative example, a marker wire was put in the same extruded member for tread rubber as in the example by the conventional coating method using a spatula. The width of the marking line and the variation in the position of the marking line in the examples and the comparative examples are the results shown in Table 1 below.

[0020]

[Table 1] As is clear from the results shown in Table 1, in the present invention, as compared with the comparative example of the conventional method, an extremely thin marker line could be inserted in the extruded member without causing positional deviation.

[0021]

As described above, in the method and apparatus for manufacturing an extruded member provided with a marking wire of the present invention, even if colored rubber cement is applied, it is extremely accurate as compared with the conventional method, and You can put in a thinner marker line than ever before.

[Brief description of drawings]

FIG. 1 is a plan view of a mouthpiece according to the present invention.

FIG. 2 is an enlarged view showing the shapes of various cutout portions of the die.

FIG. 3 is a cross-sectional view showing marking line insertion by a transfer roll.

FIG. 4 is a side view of a transfer roll according to the present invention.

FIG. 5 is a perspective view showing marking line insertion into a tread rubber by a conventional nozzle.

[Explanation of symbols]

1 mouthpiece 2 notches 3 Extruded member 4 ridges 5 Transfer roller 6-color rubber cement bath 7 color rubber cement 8,9,10 Sponge roll 11 tread rubber 12 color cement supply container 13 nozzles 14 marker line

Claims (5)

[Claims] 1. A notch formed in a die of an extruder forms a protrusion extending in a longitudinal direction on an outer surface of an extruding member, and then transfers a marking line to a top surface of the protrusion by a transfer roll. A method of manufacturing an extruded member having a marker wire, comprising: 2. The height of the protrusion is 0.75 to 2.5 mm
The manufacturing method according to claim 1, wherein 3. The width of the bottom of the ridge is 0.3 to 1.5 m
The manufacturing method according to claim 1 or 2, wherein m is m. 4. The gap between the transfer roll and the pushing member is 0.75 to 2.5 mm.
The manufacturing method described. 5. An apparatus for manufacturing an extruded member provided with a marking wire, the extruder having a notch formed in a die, and the longitudinal direction formed on the outer surface of the extruded member extruded from the extruder. An apparatus for manufacturing an extruding member having a marking wire, comprising: a transfer roll that transfers the marking wire to the top surface of the ridge.