JPH10249910A - Multilayered coated extrusion head - Google Patents

Abstract

PROBLEM TO BE SOLVED: To continuously apply a second layer coat to a first layer coat without deforming or damaging it. SOLUTION: A multilayered coating extrusion head 10 is constituted so that the outer periphery of a core material A is coated with rubber by a first coating head 12a while the core material A is allowed to run through first and second coating heads 12a, 14a to form the coating of the first layer and the outer periphery of the coating of the first layer is coated with rubber by a second coating head 14a to form the coating of a second layer. A first cylindrical body 16 is extended to the outlet 12e of the core material A of the first coating head 12a. A second cylindrical body 18 is extended to the inlet 14d of the core material A of the second coating head 14a. A first suction hole 22 sucking the air in the second cylindrical body 18 is provided on the side of the second coating head 14a of the second cylindrical body 18. The first and second cylindrical bodies 16, 18 are provided so that the leading end side of the first cylindrical body 16 is inserted into the second cylindrical body 18 so as to generate a gap 20.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multi-layer coating extrusion head for continuously coating rubber or resin in a multi-layer manner on the outer periphery of a columnar long core material.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 4, in order to manufacture a multi-layer rubber or resin layer formed on the outer periphery of a long cylindrical flexible core material A, a structure shown in FIG. Is used. The configuration is such that a first layer extruder 52 for coating the core material A with the first layer coating B, and a second layer extruder 52 arranged adjacent to the extruder 52 and the second layer
A second layer extruder 54 for coating the layer coating C.

[0003] The manufacturing method is such that the core material A is passed through the coating head 52a of the first layer extruder 52 and the coating head 54a of the second layer extruder 54 in order, and runs from the coating head 52a. The rubber or resin forming the one-layer coating B is extruded to the outer periphery of the core material A via the press-fitting path 52b, and then the rubber or resin forming the second-layer coating C is supplied from the coating head 54a via the press-fitting path 54b. It extrudes to the outer periphery of the first layer coating B. The means for running the core material A can be realized by disposing a take-up machine (not shown) for the core material A at a position after the second layer extruder 54. The interior space 52c, 54c of each coating head 52a, 54a is covered between the core material A and the first layer coating B, and between the first layer coating B and the second layer coating C, that is, coated. The vacuum or reduced pressure is set so that air does not enter as much as possible between the outer periphery of the member and the coating to be coated. Therefore, a vacuum pump (not shown) is connected to the air vent hole 56 provided in each of the coating heads 52a and 54a and communicating with each of the internal spaces 52c and 54c to bleed the internal air, and the core of each of the coating heads 52a and 54a. Material A entrance 52d, 54d
The outside air blocking seal 58 provided at the rim of the cover prevents entry of air into the inside.

As described above, a method of continuously forming a coating on a core material by arranging two or more coating heads is disclosed in Japanese Patent Application Laid-Open No. 61-290011. Sulfurization method ". This method is shown in FIG.
As shown in the figure, a rubber extruder 60, a braider 62, a rubber extruder as the first layer extruder 52, a resin extruder as the second layer extruder 54, a cooling tank 64, a vulcanizing tank 66, a resin coating Creasing machine 68, cooler 70, resin stripping machine 72
Are arranged in this order, and as shown in FIG. 7, a rubber layer A2 also constituting the core material A is formed on the outer periphery of the basic core material A1 constituting the core material A by the rubber extruder 60, and furthermore, the Reinforcing fiber A3 constituting core material A
Is wound around the outer circumference of the rubber layer A2, and the outer circumference of the outer rubber layer B as a first layer coating is further wound around the outer circumference by a rubber extruder 52.
A resin coating C as a second layer coating for suppressing the generation of air bubbles during vulcanization is formed on the outer periphery of the resin extruder 54.
Formed by And finally, the basic core material A
1 is removed, and the resin coating C is peeled off to obtain a high-pressure rubber hose. Here, the rubber extruder 52
Coating head 52a and coating head 54 of resin extruder 54
a constitutes a multilayer coating extrusion head.

[0005]

However, a conventional multi-layer coating extruding head, in which two conventional coating heads described above are arranged continuously and rubber or resin is continuously coated on the surface of a core material or the like in a vacuum or reduced pressure state, is used. There are the following issues. Core material A
The first coating B enters the second coating head 54a in a still soft state because the first coating B and the second coating C are continuously coated.
There has been a problem that the first-layer coating B is deformed or damaged by the outside air blocking seal 58 provided at the inlet 54b of FIG. For this reason, in the case of products having particularly strict outer diameter dimensions, the core material A is coated with the first-layer coating B, and then cooled once (for example, passed through a cooling bath to be cooled) to make the surface hard. After that, the operation of coating the second layer coating C was performed. In this case, 2
Although a cooling section is provided between the two coating heads 52a and 54a, there is a problem that the production line becomes long and complicated.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to solve the above-mentioned problem, and an object of the present invention is to provide a multilayer coating capable of continuously coating a second layer coating without deforming or damaging the first layer coating. It is to provide an extrusion head.

[0007]

In order to achieve the above object, the invention according to claim 1 of the present invention is characterized in that a core material is caused to travel inside a first coating head and inside a second coating head, The outer periphery of the core material is coated with rubber or resin in the first coating head to form a first layer coating.
In a multi-layer coating extruding head in which the outer periphery of a layer coating is coated with rubber or resin in the second coating head to form a second layer coating, in the direction of the second coating head from the outlet of the core of the first coating head. A first cylindrical body that extends and can pass through the inside of the core material on which the first layer coating is formed in a non-contact state; and the first coating from the entrance of the core material of the second coating head. A second cylindrical body extending in the head direction and through which the core material on which the first layer coating is formed can pass in a non-contact state, and a second cylindrical body on the side of the second coated head. A first suction hole for sucking air inside the second cylindrical body, wherein the first cylindrical body and the second cylindrical body are arranged such that a tip end side of one cylindrical body is inside the other cylindrical body. In a state where a gap is formed between the outer periphery of the one cylinder at the tip end side and the inner periphery of the other cylinder, Characterized in that it is entering.

[0008] According to this, by reducing the gap between the first cylinder and the second cylinder to some extent, viscous resistance is generated in the air flowing through the gap. For this reason, when air is sucked from the first suction hole, the inside of the second cylindrical body can be brought into a state in which the pressure is lower than that of the outside air. Therefore, the amount of air inside the second cylindrical body can be reduced, and the air can be covered by the second coating head without disposing a conventional outside air blocking seal at the entrance of the core material of the second coating head. Second
It is possible to reduce and suppress air from entering between the layer coating and the first layer coating. Since the outside air blocking seal is not required, the first layer coating is not deformed or damaged by the outside air blocking seal. Further, when outside air is sucked from the first suction hole through the gap between the first cylinder and the second cylinder, the first layer coating that passes through the first cylinder and the second cylinder. Take heat away from the surface. Therefore, when the first layer coating comes into contact with the inner wall surface of the second coating head in the second coating head because the surface of the first layer coating hardens to some extent, or when the second layer coating is performed by the second coating head. First in coating
Deformation of the layer coating can be suppressed.

Further, a second suction hole for sucking air in the gap is provided at a distal end side of the other cylindrical body overlapping with the one cylindrical body, so that the inside of the second cylindrical body is further improved. The pressure can be reduced, and the entry of air between the first layer coating and the second layer coating can be further reduced.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of a multilayer coating extrusion head according to the present invention will be described below in detail with reference to the accompanying drawings. (First Embodiment) First, a multilayer coating extrusion head 1
0 will be described with reference to FIG. The same components as those in the conventional example are denoted by the same reference numerals, and detailed description will be omitted. The multilayer coating extrusion head 10 is provided with a first coating head 12a provided in a first layer extruder 12 for extruding rubber or resin onto a core material A and coating the first layer coating B in substantially the same manner as the conventional example. And a second coating head provided on a second layer extruder 14 disposed adjacent to the extruder 12 and extruding rubber or resin onto the first layer coating B to coat the second layer coating C. 14a. Further, in each of the coating heads 12a and 14a, press-fitting paths 12b and 14b of rubber or resin and an internal space 12 through which the core material A is inserted.
c, 14c are formed, and the entrance 12d of the coating head 12a is formed.
Is provided with an outside air blocking seal 58.

The feature of the configuration of the present invention, that is, the difference from the conventional example, is that firstly, around the outlet 12e of the core material A of the first coating head 12a, the direction of the second coating head 14a (core (The same as the traveling direction of the material A) and a first cylindrical body 16 through which the core material A having the first layer coating B formed can pass in a non-contact state. . Second
A state in which the core material A extending in the direction of the first coating head 12a around the entrance 14d of the core material A of the second coating head 14a and having the first layer coating B formed therein is in a non-contact state. A second cylindrical body 18 that can pass through the second cylindrical body 18 is provided, and the distal end side of the first cylindrical body 16
This is a point that a gap 20 is inserted between the cylindrical body 18 and the inner periphery thereof.

Third, the second coating head 1 of the second cylindrical body 18
A point that a first suction hole 22 for sucking air inside the second cylindrical body 18 is provided on the 4a side. The vacuum pump 24 is connected to the first suction hole 22 in the same manner as the air vent hole 56, and sucks air in the cylindrical space 26 formed between the first cylindrical body 16 and the second cylindrical body 18. Then, the inside of the cylindrical space 26 is reduced in pressure. Fourth, in the conventional example, the outside air blocking seal 58 provided at the edge of the entrance 14d of the core material A of the second coating head 14a is not provided. Fifth
In the conventional example, the internal space 14 is provided in the second coating head 14a.
The air vent hole 56 communicating with the internal space 14c is not provided at the inlet 14d.
And the cylindrical space 26 communicates with each other. When the cylindrical space 26 is in a depressurized state, the internal space 14c is also in a depressurized state, so that the air vent hole 56 is not provided.

Next, the operation of the multilayer coating extrusion head 10 having the above configuration will be described. The basic operation is the same as that of the conventional example.
4a, the rubber or resin is pressed into the press-fitting passages 12b, 14b.
b and is extruded to the outer periphery of the core material A or the first layer coating B traveling. As a result, the outer periphery of the core material A that enters the internal space 12c from the inlet 12d of the coating head 12a and exits from the outlet 12e is coated with the first-layer coating B at the outlet 12e, and the inlet 14d of the coating head 14a is also formed. The outer periphery of the first layer coating B of the core material A that enters the internal space 14c from the outlet 14e and exits from the outlet 14e,
Layer coating C is applied.

Here, as described above, when the air in the cylindrical space 26 formed between the first cylindrical body 16 and the second cylindrical body 18 is sucked, the first cylindrical body 16 and the second cylindrical body 26 are sucked. By reducing the distance of the gap 20 to the cylinder 18 to some extent, the viscous resistance of the air passing through the gap 20 increases. The vacuum pump 24 sucks more air than the amount of air entering the cylindrical space 26 from the gap 20 through the first suction hole 22, so that the inside of the cylindrical space 26 is reduced in pressure from outside air. can do. In addition, the cylindrical space 26
Similarly, the internal space 14c of the second coating head 14a that communicates with the pressure can be reduced. For this reason, when forming the second layer coating C on the outer periphery of the first layer coating B in the second coating head 14a, it is possible to suppress air from entering between the second layer coating C and the first layer coating B. In addition, the outside air blocking seal 58 can be made unnecessary, and the first layer coating B covered by the first coating head 12a is not deformed or damaged by the outside air blocking seal 58 unlike the conventional example. .

Further, a cylindrical space 26 is formed through the first suction hole 22.
When the air inside is sucked, the outside air enters the cylindrical space 26 through the gap 20 from the tip of the second cylindrical body 18 on the first coating head 12a side, and is discharged from the first suction hole 22. An air flow is generated. This flow of air also contacts the surface of the first layer coating B of the core material A passing through the inside of the first cylindrical body 16 and the second cylindrical body 18 to take heat from the first layer coating B and cool it. Then, the surface of the first layer coating B output in a soft state from the first coating head 12a is cured. As a result, the core material A is removed from the inner space 14c of the second coating head 14a.
Even if the first layer coating B slightly contacts the inner wall surface of the internal space 14c for some reason while passing through the inside, the first layer coating B can be prevented from being deformed or damaged. Also, the second coating head 14a
The first layer coating B can be prevented from being deformed even when the pressure of the rubber or resin forming the second layer coating C that is extruded from and adheres to the outer periphery of the first layer coating B is large.

As shown in FIG. 2, the second cylinder 18
A second suction hole 28 for sucking the air in the gap 20 may be provided on the distal end side overlapping the first cylindrical body 16. Thereby, the inside of the second cylindrical body 18, that is, the inside of the cylindrical space 26 can be further reduced in pressure, and the intrusion of air between the first layer coating B and the second layer coating C can be further reduced. Therefore, it is possible to form a high quality coating with less air mixing.

(Second Embodiment) First, the configuration of the multilayer coating extrusion head 30 will be described with reference to FIG. In addition,
The same components as those in the first embodiment are denoted by the same reference numerals, and detailed description is omitted. The basic structure of the multilayer coating extrusion head 30 is substantially the same as the extrusion head 10 of the first embodiment, and only the characteristic portions will be described. The characteristic point is that, contrary to the case of the extrusion head 10, the tip end side of the second coating head 14a and the second cylindrical body 18 is provided inside the first cylindrical body 16 provided in the first coating head 12a. 16 between the inner circumference of the second cylindrical body 18 and the outer circumference of the second cylindrical body 18.
This is the point where 0 is inserted in a state where it occurs.

The second coating head 14 of the second cylindrical body 18
A first suction hole 22 is provided on the a side, and a vacuum pump 24 is connected thereto to suck air in a cylindrical space 26 formed between the first cylindrical body 16 and the second cylindrical body 18. The point that the internal space 14c of the second coating head 14a and the cylindrical space 26 are set in a reduced pressure state is the same as in the first embodiment. Thus, similarly, the outside air blocking seal 58 is not required at the rim of the entrance 14d of the second coating head 14a. Therefore, similarly to the first embodiment, the first layer coating B coated by the first coating head 12a is different from the conventional example in the outside air blocking seal 5 as in the conventional example.
It is not deformed or damaged by 8. Further, the surface of the first layer coating B of the core material A passing through the inside of the first cylindrical body 16 and the second cylindrical body 18 is cooled by the flow of air generated in the cylindrical space 26, and the surface is hardened. The same applies to points.

As shown by the dotted line in FIG. 3, similarly to the other embodiments of the first embodiment, the gap 20 is formed at the distal end side of the first cylinder 16 overlapping the second cylinder 18. A second suction hole 28 for sucking the air may be provided.
Thereby, the inside of the second cylindrical body 18, that is, the cylindrical space 2
6 can be further reduced in pressure, and the intrusion of air between the first layer coating B and the second layer coating C can be further reduced.
Therefore, it is possible to form a high quality coating with less air mixing. In recent years, the outer diameter of the first layer coating B is monitored while measuring the outer diameter, and the result is fed back to the pressure of rubber or resin extruded from the first coating head 12a, so that the outer diameter of the first layer coating B is determined in advance. Although a method of controlling to the set dimensions is adopted, the multilayer coating extrusion head 10 of the present invention,
In the case of 30, the space between the first coating head 12a and the second coating head 14a is covered by the cylindrical bodies 16 and 18. For this reason, as shown in FIG. 3, a monitoring window 32 made of glass or the like is provided on a part of the first cylindrical body 16 and the second cylindrical body 18, and an outside diameter measuring device (not shown) is installed in accordance with the monitoring window 32. To do. The same applies to the cases of FIG. 1 and FIG. When the outer diameter measuring device is not used, the monitoring window 32 is unnecessary.

Each of the cylindrical bodies 16 and 18 may be cylindrical or polygonal cylindrical. However, as long as a gap 20 is formed between the cylindrical bodies 16 and 18, the overlapping portions are formed in a funnel shape. Various changes are possible, for example, it may be performed. Further, the multilayer-coated extrusion heads 10 and 30 described in the above embodiments may be used for manufacturing the high-pressure rubber hose described in the conventional example, and can also be applied to the coating of electric wires and the like. Further, the material of the coating may be rubber or synthetic resin, a configuration in which the outer circumference of the rubber coating is further coated with a rubber coating, or a configuration in which the outer circumference of the resin coating is further coated with a resin coating may be used. A configuration in which a rubber coating is coated on the outer periphery of the resin coating may be used. Further, as an example, two coating heads are provided, and two coating heads are provided between each coating head.
Multilayer coating extrusion head 10 having a configuration in which two cylinders are arranged,
Although 30 has been described, a configuration in which a large number of coating heads are arranged adjacent to each other, and two cylinders are similarly arranged between the coating heads to reduce the pressure may be adopted. By employing this configuration, it is possible to form not only a two-layer coating but also a three-layer, four-layer, or other multi-layer coating on the core material.

As described above, various preferred embodiments of the present invention have been described. However, the present invention is not limited to the above-described embodiments, and many modifications can be made without departing from the spirit of the invention. Of course.

[0022]

When the multilayer coating extrusion head according to the present invention is used, the gap between the first cylinder and the second cylinder is narrowed to some extent, so that the viscous resistance is generated in the air flowing through the gap. For this reason, when air is sucked from the first suction hole, the inside of the second cylindrical body can be brought into a state in which the pressure is lower than that of the outside air. Therefore, the amount of air inside the second cylindrical body can be reduced, and the air can be covered by the second coating head without disposing a conventional outside air blocking seal at the entrance of the core material of the second coating head. It is possible to reduce and suppress air from entering between the second layer coating and the first layer coating. Since the outside air blocking seal is not required, the first layer coating is not deformed or damaged by the outside air blocking seal. Further, outside air is supplied to the first cylinder and the second cylinder.
When sucked from the first suction hole through the gap between the first cylindrical body and the first cylindrical body, heat is taken from the surface of the first layer coating passing through the first cylindrical body and the second cylindrical body. Therefore, when the first layer coating contacts the inner wall surface of the second coating head in the second coating head because the surface of the first layer coating hardens to some extent, or when the second layer coating is performed by the second coating head. An effect is obtained that the first layer coating can be prevented from being deformed during coating.

[Brief description of the drawings]

FIG. 1 is a front sectional view showing the structure of a first embodiment of a multilayer coating extrusion head according to the present invention.

FIG. 2 is a front sectional view showing a structure of another embodiment of FIG. 1;

FIG. 3 is a front sectional view showing a structure of a second embodiment of a multilayer coating extrusion head according to the present invention.

FIG. 4 is an explanatory view showing a state in which a core material is covered with a first layer coating and a second layer coating.

FIG. 5 is a front sectional view showing a conventional example of a multilayer coating extrusion head in which a core material of FIG. 4 is coated with a first layer coating and a second layer coating.

FIG. 6 is an explanatory view showing a method of manufacturing a high-pressure rubber hose using the multilayer-coated extrusion head of FIG.

FIG. 7 is an explanatory diagram showing a configuration of a multilayer-coated core material manufactured by the manufacturing method of FIG. 6;

[Explanation of symbols]

 Reference Signs List 10 multilayer coating extrusion head 12a first coating head 12e outlet of first coating head 14a second coating head 14d inlet of second coating head 16 first cylinder 18 second cylinder 20 gap 22 first suction hole A core B First layer coating C Second layer coating

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification code FI // B29K 21:00 B29L 9:00 23:00

Claims (2)

[Claims] 1. A method according to claim 1, wherein the core material is moved inside the first coating head and inside the second coating head, and the first material is placed on the outer periphery of the core material.
A multi-layer coating extrusion in which a first layer coating is formed by coating rubber or resin in the coating head, and then a second layer coating is formed by coating the outer periphery of the first layer coating with rubber or resin in the second coating head. In the head, while extending in the direction of the second coating head from the outlet of the core of the first coating head, the core on which the first layer coating is formed can pass through in a non-contact state. A first cylindrical body, extending from the entrance of the core material of the second coating head toward the first coating head, and the inside of the core material having the first layer coating formed therein is in a non-contact state; A second cylindrical body that can pass therethrough; and a first suction hole provided on the second cylindrical body side of the second coating head for sucking air inside the second cylindrical body. Body and the second cylindrical body, the tip side of one cylindrical body is the other cylindrical body A multi-layer coating extrusion head, wherein a gap is formed between the outer circumference of the one cylindrical body at the tip end side and the inner circumference of the other cylindrical body. 2. A second suction hole for sucking air in the gap is provided on a tip side of the other cylinder body overlapping with the one cylinder body. Item 2. A multilayer coating extrusion head according to Item 1.