JPH0673892B2 - Extrusion-coated wire rod color changing device and color changing method - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a color changing device and a color changing method for extruded coated wire.

<Prior Art> When a wire material such as an electric wire is extruded and coated with a plastic material such as rubber, the color of the coating often needs to be changed, which is called color change.

In order to perform the color change easily and quickly, by supplying materials of different colors to each extruder, and by operating a switching valve provided in the material passage from each extruder to the common coating extrusion head,
The running wire is covered with a material of any color.

At that time, if the extruder that supplies the material other than the material that actually coats the wire is stopped, the material will solidify and become unusable. Therefore, the recently developed special publication Sho 63-500580 "Plastic material is supplied to the extrusion head." The "device for" does not, in principle, stop the extruder of any material.

The disclosed invention provides three extruders, one with a central, colorless main material and the other two with different colored coating materials. When changing the coating material, the material that has been sent to the surface layer until then is press-fitted into the main material, and the material previously press-fitted into the main material is directed to the surface layer.

Since the required amount of the coating material until the color change is supplied to the extruder, the unnecessary coating material is pressed into the main material as described above only during the transient period of the color change.

<Problems to be Solved by the Invention> The above disclosed invention has the trouble of measuring the supply amount of the coating material to the extruder, the inside of the switching valve of the passage for sending the coating material to the common coating extrusion head, and the extrusion head. However, there is a problem that the material to be coated between the dies and nipples is stagnant, clogged, or the product is defective in smoothness due to lack of smooth extrusion.

An object of the present invention is to develop a color changing device without such a problem and a color changing method using the same.

<Means for Solving the Problem> Part 1 of the wire color changing device for extrusion coating of the present invention
Is a color changing device that switches the color of the material extruded and coated on the running wire rod to another color at any time. An extrusion head to be covered and a passage switching valve provided in the material passage from each of the extruders to the extrusion head are provided. The switching valve is a cylindrical rotation in which the valve body in the valve box is coaxial and watertight sliding. One of the two internal passages, each of which is composed of a fixed part and a fixed part, and whose inlet is located at a symmetrical position on the peripheral surface of the rotating part, passes through the axial centers of the rotating part and the fixed part to one outlet on the peripheral surface of the fixed part. The other end of the passage is branched midway in the rotating part, passes through the peripheral symmetrical position of the boundary surface between the rotating part and the fixed part, and then is unified in the fixed part to the other outlet of the peripheral surface of the fixed part. Has reached, and by rotating the rotating part halfway, the material is introduced into each material inlet of the valve box. Wherein the rotating unit inlet is so replaced.

Similarly, in No. 2 of the apparatus of No. 1, in the rotary unit, the discharge material inlets provided at two points equidistant from the two inlets on the same circumference as the two inlets, and the respective inlets. A material discharge path extending axially along the peripheral surface of the rotating portion by a constant distance to reach the respective discharge openings of the peripheral surface, and the discharged material receiving openings communicate with the respective material introducing openings of the valve box. When it comes to the position, the discharge port communicates with the material discharge passage of the valve box.

Similarly, in No. 3, in the apparatus of No. 1, the extrusion head, which overlaps and coats the material on the traveling wire rod, entirely coats one material on the outer circumference of the traveling wire rod and linearly coats the other material on the entire surface. It is characterized by being.

Part 1 of the method of changing the color of the extrusion-coated wire rod according to the present invention is a color-changing device that changes the color of the material to be extrusion-coated on the running wire rod to another color at any time, which is produced first from one of the two extruders. The coating material of the color of the wire and the coating material of the color of the wire to be produced next are extruded from the other, respectively. The material of the upper and lower layers is switched by switching the passage switching valve of the color changing device according to claim (1), which is provided to cover the traveling wire rod and then provided in the material passage from each of the extruders to the extrusion head. The feature is to reverse.

Similarly, the method 2 is the same as the color changing method 1 described above.
The running wire is an electric wire coated beforehand with insulating rubber,
The upper layer and the lower layer, which are overlaid thereon, are characterized in that they are thin films with different colors for identification.

<Working> Part 1 of the extruded coated wire rod color changing device of the present invention includes two extruders for extruding materials of different colors, an extrusion head for overlappingly coating traveling wire rods, and an extruder head for extruding heads. The main equipment is the switching valve for the material passage. The switching valve replaces the upper and lower coating layers that are overlaid by the extrusion head.

In the switching valve of the present invention, which plays a main role as a color changing device, the cylindrical rotating portion and the fixed portion are coaxially overlapped with each other, and when the rotating portion is rotated, the boundary surface between the two slides in a watertight manner.

It is only the rotating part that rotates as a valve, and even if the fixed part has a shape similar to the rotating part, it acts like a part of the valve box. The similar shape means that in both the cylindrical rotating part and the fixed part, a central passage that axially passes through the central part of the boundary surface of the rotating part and the fixed part, and a symmetrical position when passing through the boundary surface, This is a point that has a branch passage that gathers together when leaving the boundary surface.

The central passage and the branch passage of the switching valve rotating portion communicate from two inlets located at symmetrical positions on the outer surface of the rotating portion to the two material inlets of the valve box, and the central passage and the branch passage of the fixed portion are fixed portions. It communicates with the outer surface and reaches the material pressure inlets for the upper layer and the lower layer of the extrusion head for lap coating through the passage in the valve box.

When the rotary part is rotated halfway around the axis, the positions of the two inlets are switched, so that the materials received by the central passage and the branch passage are also switched. Even if the two passages make a half turn, they connect to the two passages on the fixed side without any problem at the boundary surface.Therefore, the replaced material passes through the fixed portion and the valve box, and then the two material inlets of the extrusion head for lap coating. Then, the upper and lower layers of the overlapping coating, that is, the colors are switched.

The color changing device (2) of the present invention has a function of directing the unnecessary material to the discharge path by the switching valve without advancing the unnecessary material to the extrusion head, in addition to the material switching function of the above (1). This is because switching is performed at the time of overlapping coating by providing discharge passages with discharge material receiving ports at two points equidistant from both inlets on the same circumference as the two inlets at symmetrical positions of the switching valve rotating part. When the valve rotating part was rotated a quarter turn, that is, 90 °, the material was made to flow from the material inlet of the valve box through the discharge material receiving port and discharge path to the material discharge passage of the valve box.

The color changing device 3 of the present invention covers the entire surface of the wire material with one material and linearly covers the other material thereon to form the identification line, which is a modification of the overcoating. The color of and the color of the identification line can be exchanged.

The color changing method No. 1 of the present invention is the color changing apparatus No. 1 described above.
The first and second coating materials are simultaneously extruded by two extruders, and the second material is concealed in the lower layer until the wire coated with the first material reaches the required amount. After that, since the upper and lower layer materials are switched and the second material is discharged to the upper layer, the color changing operation can be performed easily and smoothly.

The color changing method No. 2 of the present invention is that the thickness required for the covering rubber of the electric wire is covered with a colorless insulating rubber, and two kinds of colored rubbers for color changing are overlaid and covered thereon as a thin film. By doing so, the colored material can be saved.

<Embodiment> FIG. 1 shows an embodiment of the color changing device 1 according to the present invention.
The inventions of the second and third aspects can also be explained with reference to FIG. 1 is an extruder, 2 is an extrusion head, 3 is a switching valve,
The running wire W passes through the core of the extrusion head 2. In this embodiment, the valve box 4 of the switching valve 3 is specially made so as to be directly connected to the extrusion port of each extruder 1, and the extrusion head 2 is also fitted and fixed.

The material extruded from the extruder 1 is supplied to the material inlet 5 of the valve box 4,
From 5 ', enter the symmetrical position on both sides of the valve (valve body) 3. 2nd
Explaining with reference to FIG. 4, the valve body 3 includes a cylindrical rotating portion 3a and a stationary portion 3b.
Are vertically overlapped with each other, are fitted into the protruding shaft 6 on the side of the fixed portion 3b and rotate relative to each other, and slide in a watertight manner on the upper and lower boundary surfaces 7.

The material inlets 8 and 8'at symmetrical positions on the circumferential surface of the rotating portion 3 and the material inlets 5 and 5'of the valve box 4 face each other, and the relationship is that even if the rotating portion 3 is rotated half a turn, It does not change, only the entrance 8 is replaced.

Now, the different colored materials that have entered the inlets 8 and 8'on both sides pass through the boundary surface 7 through different passages in the rotating portion 3a, and also through different passages in the fixed portion 3b, and the lower layer material of the valve box 4 is obtained. Passage 9
Or through the upper layer material passage 10 to enter the lower layer and upper layer material pressure inlets 11 and 12 of the extrusion head 2. The material that has entered the lower layer material pressure inlet 11 gradually spreads to the left and right and is extruded through the gap between the nipple 13 and the die 14 to cover the wire W. The material entering the upper layer material pressure inlet 12 first fills the circular groove on the outer periphery of the die 14, and then covers the outer layer of the lower layer material, and the nipple 13 and the die 14 together.
It is extruded in between and the wire W is overlapped and covered. In the case of the color changing device 3 of the present invention, the material that has entered the pressurizing port 12 is guided in a linear shape, and is placed on the outer surface of the lower layer material to coat the wire material W,
It becomes the identification line G4 in FIG.

Next, the switching valve 3 will be described in detail. Second as mentioned above
The drawings are shown in FIGS. 4 to 4. Since the internal structure is a little difficult to understand, the valve box 4 is shown in FIG. 5 and the valve 3 is shown in FIG.
The operation explanatory drawing was drawn in FIGS.

As described above, the valve body of the switching valve 3 includes the rotating portion 3a and the fixed portion 3b, but only the former rotates as a valve. However, both of them are provided with central passages 15 and 16 passing through the central portion of the boundary surface 7 and branch passages 17 and 18 passing through symmetrical positions in the peripheral portion of the boundary surface 7 as internal passages. In the rotating portion 3a, the central passage 15 and the branch passages are provided. In the fixed part 3b, the central passage 16 and the branch passage 18 are respectively connected to the outer outlets 8 and 8 '.
It leads to 9 '.

The outlets 19 and 19 'are connected to the lower and upper material passages 9 and 10 in the valve box 4 shown in FIG.
Send to 1,12.

Referring to FIG. 7 for explaining the operation, the material entering from the inlet 8 of the rotating portion 3a reaches the outlet 19 through the central passages 15 and 16, and the material entering from the inlet 8'passes through the branch passages 17 and 18. Exit 19 ′
Go to. When the rotating portion 3a is rotated half a turn from this state, the state changes to that shown in FIG. This time, the material entered from the inlet 8 is the outlet 1
9 ', the material entering from the inlet 8'exit from the outlet 19,
The material exiting the exits 19, 19 'is the opposite of what it was. In other words, the materials sent to the two pressure inlets 11 and 12 of the extrusion head 2 are exchanged, so that the upper and lower layer materials of the overcoat are exchanged.

Next, the color changing device 2 of the present invention will be described. This is a device with an unnecessary material discharge mechanism added to the above-mentioned device. It is shown in all figures except FIGS. 1 and 2, the material discharge paths 20 on both sides of the rotating part and the material discharge path on the valve box 4 side. 21.

The material discharge passage 20 of the rotating portion 3a has a receiving end 20a at its upper end, which is provided at two points equidistant from both inlets 8 and 8'on the same circumference as the inlets 8 and 8 '. Therefore, when the rotating portion 3a makes a quarter turn from the position during the overlapping coating operation, the discharge material receiving port 20a stops facing the material introducing ports 5 and 5'of the valve box, and the respective discharge materials 20a and 20b are discharged. Accept to. Each discharge path 20 extends along the peripheral surface of the rotating portion 3a by a constant distance in the axial direction, and the discharge port 20b on the peripheral surface
In this embodiment, since the entire discharge passage 20 is a circumferential groove, the lower end of the groove is the discharge port 20b. The discharge port 20b is connected to the material discharge passage 21 of the valve box 4 when the receiving port 20a reaches the position for receiving the material.

FIG. 10 is a sectional view of an electric wire produced by the color changing method 1 of the present invention, in which W is a wire material, that is, copper wire, and G1 and G2 are coating rubbers having different colors. In the case of FIG. 10, G1 and G2 are combined to have a required coating thickness, so that the rubber in the lower layer functions as a coating material even if no color appears on the surface.

FIG. 11 shows a color change method No. 2 of the present invention. First, the copper wire W is first made to have a colorless insulating rubber G3 so that it has a thickness close to the required coating thickness, and G1 and G2 are formed as a thin film on it. It can be overlaid and the upper and lower layers of G1 and G2 can be replaced at any time.

FIG. 12 is a cross section of a coated wire made by the color changing device 3 of the present invention, which is a linear coating in which G4 is an identification line.

Although the respective inventions have been described above with reference to the embodiments, it is needless to say that the respective inventions can be variously changed and applied depending on the implementation conditions and according to the known technology of the engineer in charge.

<Effects of the Invention> The color changing device No. 1 of the present invention, when the coating material having different colors is continuously fed from the respective extruders (without cooling and solidifying) to the traveling wire rods to perform the color change by the switching valve, Since the unnecessary material is not pressed into the main material of the core as in the invention disclosed in, the unnecessary material is used in the lower layer side of the overcoat, so there is no waste, and the amount of material supplied to the extruder is accurately determined. There is no need for difficulty in setting the required amount until switching.

In the material passage switching valve of the present invention, first, the passages of the two kinds of materials in the valve are both oriented in the valve axis direction, one is a central passage and the other is a unique branch passage. As a result, the rotating part that divides the valve body into two parts is a watertight boundary surface of the fixed part, one passes through the symmetrical position in the center and the other in the peripheral part. If you replace the entrance,
We opened a new model in which the material that goes out to each exit of the fixed part is also replaced.

By adopting this new type switching valve, the color changing device 2 of the present invention in which all the materials coming from the extruder can be discharged by the switching valve becomes possible. That is, by simply making short material discharge passages on both sides of the rotary portion of the valve and providing a material discharge passage in the valve box, it is possible to discharge all the material by rotating the rotary portion a quarter turn. Is particularly effective when exchanging the die and nipple of the extrusion head.

The color changing device No. 3 of the present invention adds a new method of changing the coating material and the identification wire material on the coating material at any time to the concept of color changing, which was decided to change the color of the coating of the wire material.

The color changing method No. 1 of the present invention uses the above-mentioned color changing device to simultaneously extrude two kinds of covering materials, which are covering wires having different colors to be sequentially produced, with two extruders, and to produce the first wire. The method of switching to the next color coating was opened immediately after the completion.

The color changing method No. 2 of the present invention is to use an amount of a colored material by coating a wire coated with a colorless rubber for insulation having a required thickness with a material of different colors as a thin film and switching the upper and lower layers at any time. Is minimized, and the color can be changed at any time.

[Brief description of drawings]

FIG. 1 is a plan cross-sectional view of an embodiment of the color changing device of the present invention, FIGS. 2 and 3 are elevation views, side views, and FIG. 4 of a switching valve common to the color changing device of the present invention. 2 is a sectional view taken along the line XX, FIG. 5 is an explanatory view mainly showing the material passage of the valve box, FIG. 6 is an explanatory view of the valve body, FIGS. Figure 12 is a cross-sectional view of the three types of coated wire rods made, in which 1 is an extruder,
2 is an extrusion head, 3 is a switching valve, 20 is a material discharge passage, and G4 is a linear coating.

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Claims (5)

[Claims] 1. A color changing device for changing the color of a material extruded and coated on a running wire rod to another color at any time, and two extruders for extruding materials of different colors and a running wire rod are surrounded by the extruder. An extrusion head for overlapping and coating the material and a passage switching valve provided in the material passage from each of the extruders to the extrusion head are provided, and the switching valve has a valve body in a valve box that is coaxial and watertight slides. One of the two internal passages, which is composed of a cylindrical rotating portion and a fixed portion, and whose inlet is a symmetrical position on the peripheral surface of the rotating portion,
It reaches the outlet on one side of the peripheral surface of the fixed part through the axis of the rotary part and the fixed part, and the other side of the passage branches in the middle of the rotary part to form a symmetrical position at the peripheral part of the boundary surface between the rotary part and the fixed part. After passing through the valve, it is unified in the fixed part and reaches the other outlet of the peripheral surface of the fixed part.By rotating the rotary part half a turn, the two parts of the rotary part communicated with each material inlet of the valve box. A color changing device for extruded coated wire, characterized in that the three inlets are switched. 2. The apparatus according to claim 1, wherein the rotating portion has an exhaust material receiving port provided at two points equidistant from the two inlets on the same circumference as the two inlets. , A material discharge passage extending from each of the inlets along the circumferential surface of the rotating portion in the axial direction by a constant distance to reach each of the discharge outlets of the peripheral surface, and each of the discharged material inlets corresponds to each of the valve boxes. A color changing device for an extruded coated wire, wherein the discharge port communicates with a material discharge passage of the valve box when it reaches a position leading to the material introduction port. 3. The apparatus according to claim 1, wherein the extrusion head for coating the traveling wire rod with the material overlaps the outer periphery of the traveling wire rod with one material and the other material with the entire surface. An extruded coated wire color changing device characterized by being coated linearly on top. 4. A color changing method in which the color of a material extruded and coated on a running wire is switched to another color at any time. In one of the two extruders, a coating material having the color of the wire to be produced first and the other from The coating materials of the color of the wire to be produced next are extruded respectively, the former material is sent to the upper layer material inlet of the extrusion head for lap coating and the latter material is also sent to the lower layer material inlet to coat the running wire, and then A method for changing the color of an extruded coated wire rod, comprising switching a passage switching valve provided in a material passage from each of the extruders to the extrusion head to reverse the materials of the upper and lower layers. 5. The color changing method according to claim 4, wherein the running wire is an electric wire coated with an insulating rubber in advance, and the upper layer and the lower layer, which are overlaid on each other, have different colors for identification. A method for changing the color of an extruded coated wire, which is a thin film provided with.