JPH04175137A - Color changing device and color changing method of extruded coated wire - Google Patents

Abstract

PURPOSE:To enable the title method to change to a coating of the next color upon completion of production of the first wire, by a method wherein a passage changeover valve of a color changeover device provided in a material passage to an extruding head from extruding machines each is changed over and materials in an upper and lower layers are reversed. CONSTITUTION:The first and second coated materials are extruded at the same time by two extruding machines 1 and the second material is concealed away in a lower layer until the coated wire W of an upper layer of the first material attains to a necessary quantity. The upper and lower layer materials are clanged over by a passage changeover valve 3 and the second material is put out in the upper layer after that. With this construction, color changing operation can be performed simply and smoothly.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a color changing device and a color changing method for extruded coated wire.

<Prior Art> When a wire such as an electric wire is extruded and coated with a plastic material such as rubber, the color of the coating must be changed frequently, and this is called color changing.

In order to easily and quickly change the color, materials of different colors are supplied to each extruder, and by operating a switching valve installed in the material path from each extruder to a common coating extrusion head,
The running wire is coated with a material of any color.

At that time, if the extruder that feeds the material other than the material that actually coats the wire is stopped, the material will solidify and become unusable. As a general rule, the extruder for any material does not stop.

In the disclosed invention, one of the extruders in the king's office supplies the colorless main material at the center, and the other two extruders supply the covering material Ne-4 in different colors. When changing the coating material, the material that had been sent to the surface layer is press-fitted into the interior of the main material, and the material that had been previously press-fitted into the main material is directed toward the surface layer.

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

<Problems to be Solved by the Invention> The above-mentioned disclosed invention not only takes the trouble of measuring the amount of coating material supplied to the extruder, but also prevents the inside of the switching valve of the passage that sends the coating material to a common coating extrusion head, or the extrusion head. There were problems such as the material being coated between the die and nipples stagnation or clogging, and the extrusion was not smooth, resulting in defective parts in the product.

The object of the present invention is to develop a color changing device free from such problems and a color changing method using the same.

<Means for Solving the Problems> Part 1 of the color changing device of the extrusion coated wire of the present invention is a color changing device that changes the color of the material extruded and coated on the running wire to another color at any time. Equipped with two extruders that press the material, an extrusion head that surrounds the running wire and overlays and coats the material, and a passage switching valve provided in the material passage from each of the extruders to the extrusion head. In the switching valve, the valve body in the valve box is composed of a cylindrical rotating part and a fixed part in which the valve body slides coaxially and watertight, and one of the two passages whose population is symmetrically located on the outer surface of the rotating part is, The passage passes through the center of the interface between the rotating part and the fixed part to reach the outer surface of the fixed part, and the other passage branches off midway and passes through a symmetrical position on the periphery of the boundary surface, and then becomes a single passage that passes through the outer surface of the fixed part. The present invention is characterized in that by rotating the rotating part by half a rotation, the numbers of the rotating parts communicating with each material inlet of the valve box are replaced.

Similarly, part 2 is that the apparatus of part 1 has discharged material receiving ports at two points equidistant from the inlets on the same circumference as the two inlets of the rotating section, and from each of the receiving ports, the above-mentioned A material discharge path is provided that extends in the axial direction along the circumferential surface of the rotating part by a certain distance and reaches a discharge port on the circumferential surface, and the discharged material receiving port is located at a position where each of the discharged material receiving ports communicates with each material inlet of the valve box. The discharge port is characterized in that the discharge port communicates with a material discharge passage of the valve box.

Same (part 3 is that in the apparatus of part 1, the above extrusion head that overlaps and coats the running wire with material 9f4 coats the entire outer periphery of the running wire with the - side material, and then applies the other material on the entire surface of the running wire.) It is characterized by being coated in a shape.

The first method of changing the color of extruded coated wire of the present invention is to change the color of the extrusion coated material on the running wire to another color at any time. Extrude the coating material of the color of the wire rod and the coating material of the color of the next wire rod to be produced from the other side, overlap the former material, and send the latter material to the upper layer material injection port of the coating extrusion head, and the latter material to the lower layer material injection port. Then, the passage switching valve of the color changing device according to claim 1, which is provided in the material passage from each of the extruders to the extrusion head, is switched to change the material of the upper and lower layers. It is characterized by being reversed.

Similarly, method 2 is the above color change method 1,
The running wire is an electric wire coated with insulating rubber in advance,
The upper and lower layers coated thereon are both characterized by being thin films with different colors for identification.

<Function> Part 1 of the extrusion coated wire color changing device of the present invention includes a royal extruder that extrudes materials of different colors, an extrusion head that overlays and coats the running wire, and an extrusion head from each extruder to the extrusion head. The main equipment is the switching valve for the material passage. The switching valve switches the upper and lower coating layers that are overlapped by the extrusion head.

The switching valve of the present invention, which plays the main role as a color changing device, has a cylindrical rotating part and a fixed part that overlap coaxially, and when the rotating part is rotated, the interface between the two slides in a watertight manner.

Only the rotating part rotates as a valve, and although the fixed part has a similar shape to the rotating part, it acts like a part of the valve body. Similar shapes mean that both the cylindrical rotating part and the fixed part have a central passage that passes through the center of the interface between the rotating part and the fixed part in the axial direction, and when passing through the above interface, it is divided into symmetrical positions. It has a branch passageway that becomes one line when it leaves the boundary surface.

The central passage and branch passages of the rotating part of the switching valve lead to the two material inlets of the valve body from two inlets located at symmetrical positions on the outer surface of the rotating part, and the central passage and branch passages of the fixed part are connected to the fixed part. It leads to the outer surface and, via a passage in the valve body, to the material injection inlets for the upper and lower layers of the overlapping extrusion head.

When the rotating part is rotated half a turn around the axis, the positions of the two inlets are swapped, and the materials that the central passage and the branch passages receive are also swapped.

Even if the two passages are rotated half a turn, they connect without any problem with the two passages on the fixed part side at the interface, so the exchanged material passes through the fixed part and the valve box, and then enters the two material injection ports of the extrusion head for overlapping coating. Then, the upper and lower layers of the overlapping coating, that is, the colors, will be swapped.

Color changing device No. 2 of the present invention, in addition to the material switching action of No. 1 above, has the action of directing the unnecessary material to the discharge path using the switching valve instead of forwarding it to the extrusion head. This is achieved by providing a discharge path with a discharge material receiving port at two points equidistant from the inlet on the same circumference as the two symmetrically located inlets of the switching valve rotating part, which enables switching during overlapping coating. When the valve rotating part is rotated by a quarter turn, that is, by 90 degrees, the material flows from the material inlet of the valve box through the discharged material receiving port and the discharge path to the material discharge passage of the valve box.

Color changing device No. 3 of the present invention is a modification of overlapping coating, in which the entire wire is covered with one material, and the other material is coated on top of that in a linear manner to form an identification line, and the entire surface is covered. The color of the identification line can be swapped with the color of the identification line.

Color changing method No. 1 of the present invention is the above-mentioned color changing device No. 1.
The first and second coating materials are simultaneously extruded using an extruder, and the second material is hidden in the lower layer until the required amount of wire rod is coated with the upper layer of the first material. After that, the materials of the upper and lower layers are switched and the second material is brought out to the upper layer, so the color change operation is easily and smoothly performed.

Color change method No. 2 of the present invention is to coat the electric wire with colorless insulating rubber to the required thickness, and then coat it with two types of colored rubber as thin films for color change, and change the color as needed. By doing this, colored materials can be saved.

<Example> FIG. 1 shows a first embodiment of the color changing device of the present invention.

Incidentally, the second and third inventions can also be explained using this FIG. 1 is an extruder, 2 is an extrusion head, 3 is a switching valve, and 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 manufactured and is directly connected to the extrusion port of each extruder 1, and the extrusion head 2 is also fitted and fixed therein.

The material extruded from the extruder 1 is passed through the material inlet 5 of the valve box 4,
5', enter the symmetrical position on both sides of the valve (valve body) 3. Second
To explain with Figure 4, in the valve body 3, the cylindrical rotating part 3a and the fixed part 3b overlap vertically, are fitted into the protruding shaft 6 on the fixed part 3b side and rotate relative to each other, and the upper and lower boundary surfaces 7 are sliding It is supposed to be done.

The material inlet 8°8 at a symmetrical position on the outer surface of the rotating part 3 and the material inlet ports 5, 5 of the aforementioned valve body 4 face each other. It doesn't change just by replacing it.

Now, the materials of different colors entering the inlets 8 on both sides are transferred to the rotating part 3.
a through the interface 7 through different passages in the fixing part 3
It passes through different passages within b, and enters the lower layer and upper layer material injection ports 1) 12 of the extrusion head 2 via the lower layer material passage 89 or the upper layer material passage 10 of the valve box 4. The material entering the lower layer material injection port 1) gradually spreads from side to side until it reaches the nipple 13 and the die 1.
4 to cover the wire W. The material entering the upper layer material injection port 12 first fills the circular groove on the outer periphery of the die 14, and then covers the outside of the lower layer material and is extruded together between the nipple 13 and the die 14, thereby overlapping and covering the wire W. In the case of color changing device No. 3 of the present invention, the material entering the injection port 12 is guided in a linear manner, resting on the outer surface of the lower layer material and covering the wire W, forming the identification line G4 in FIG. 12.

Next, the switching valve 3 will be explained in detail. As mentioned above, the second
The drawings are shown in Figures 4 and 5, but since the internal structure is a little difficult to understand, Figure 5 is an explanatory diagram of the valve box 4, Figure 6 is an explanatory diagram of the valve 3,
Action explanatory diagrams are drawn in Figs. 7 to 9.

As mentioned above, the valve body of the switching valve 3 has a rotating part 3a and a fixed part 3b.
However, only the former rotates as a valve.

However, as internal passages, both have central passages 15 and 16 passing through the center of the boundary surface 7, and branch passages 17 and 18 passing at symmetrical positions on the periphery of the boundary surface 7, and in the rotating part 3a, the central passage 15 and the branch passages 17 are external entrances 8, 8', respectively.
, and in the fixed part 3b, the central passage 16 and the branch passage 1
8 each lead to an outlet 19, 19' on the outer surface.

Its outlets 19, 19' are connected to the lower and upper material passages 9, 10 in the valve body 4 of FIG. Send to 12.

Looking at this in the action explanatory diagram FIG. 7, the population of the rotating part 3a is 8.
The material entering through the central channel 15, 16 reaches the outlet 19, and the material entering through the inlet 8' exits via the branch channel 17, 18 at the outlet 19'. When the rotating part 3a is rotated half a turn from this state, the state changes to the state shown in FIG. 8. Now the material entering through inlet 8 exits through outlet 19'', the material entering through inlet 8' exits through outlet 19, and the material exiting through outlet 19.19'' is reversed from before, i.e. the extrusion head. Since the materials sent to the two injection ports 1) and 12 of 2 are exchanged, the materials of the upper and lower layers of the overlapping coating are exchanged.

Next, the second color changing device of the present invention will be described. This is the above-mentioned device plus an unnecessary material discharge mechanism, which consists of the material discharge passages 20 on both sides of the rotating part that appear in all figures except Figures 1 and 2, and the material discharge passage on the side of the valve box 4. 2I.

The upper end of the material discharge path 20 of the rotating part 3a is an intake port 20a,
It is provided at two points on the same circumference as the inlet 8,8' and equidistant from both ports 8,8'. Therefore, when the rotating part 3a rotates a quarter turn from the position where the overlapping operation is being performed, the discharged material receiving port 2
0a faces the material inlet 5.5' of the valve body and receives the respective material into the respective discharge channel 20. Each discharge passage 20 extends a fixed distance in the axial direction along the circumferential surface of the rotating part 3a and exits to the discharge port 20b on the circumferential surface, but in this embodiment, the entire discharge passage 20 is a circumferential groove. The lower end of is a 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 a position for receiving material.

FIG. 10 is a cross-sectional view of an electric wire made by the color changing method No. 1 of the present invention, in which W is a wire material, that is, a copper wire, G1,
G2 is a coating rubber with different colors. In the case of Figure 10,
Since G1 and G2 are combined to the required coating thickness, the lower layer rubber functions as a coating material even if the color does not appear on the surface.

Figure 1) was made using the color changing method 2 of this invention, in which the copper wire W was first held with colorless insulating rubber G3,
The beam is made to have a coating thickness close to the required thickness, and 61 and G2 are layered on top of it as thin films, 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 produced by the third color changing device of the present invention, in which G4 is a linear coating with an identification line.

Although each invention has been described above with reference to one embodiment, it goes without saying that each invention can be varied and applied in various ways depending on the implementation conditions and the well-known techniques of the engineer in charge.

<Effects of the Invention> The color changing device No. 1 of the present invention continuously feeds coating materials of different colors to the running wire from each extruder and changes the color using the switching valve (without cooling and solidifying). Unlike the disclosed invention, unnecessary material is not press-fitted into the main core material, but unnecessary material is used on the lower layer side of the overlapping coating, so there is no need to worry or waste, and the amount of material fed to the extruder can be accurately controlled. There is no need for the difficulty of determining the required amount until switching.

In the material passage switching valve of the present invention, for the first time, the passages for the two types of materials in the valve are both oriented in the valve axis direction, with one being a central passage and the other being a unique branch passage. As a result, the valve body is divided into two parts, and the watertight sliding interface between the rotating part and the fixed part passes through symmetrical positions, one in the center and the other in the periphery. If you replace the entrance,
A new type of system was developed in which the materials coming out of each exit of the fixed part are also replaced.

By using this new type of switching valve, the second color changing device of this invention has become possible, in which all the material coming from the extruder can be discharged by the switching valve. In other words, by simply creating a short material discharge path on both sides of the rotating part of the valve and providing a material discharge passage in the valve box, all the material can be discharged by rotating the rotating part by a quarter of a turn. This is especially effective when extrusion head dies and nipples are replaced.

Color changing device No. 3 of the present invention adds a new method to the concept of color changing, which was determined to change the color of the wire coating, to replace the coating material and the identification line material thereon at any time.

Color changing method No. 1 of the present invention is to use the above-mentioned color changing device to simultaneously extrude two types of coating materials for coated wire rods of different colors to be sequentially produced using a royal extruder, so that the production of the first wire rod can be completed. Once finished, we immediately switched to the next color coating.

Color changing method 2 of this invention is to use colored materials by overlaying thin films of materials of different colors on electric wires coated with colorless insulating rubber of the required thickness, and switching the upper and lower layers as needed. We minimized the amount and also made it possible to change the color at any time.

[Brief explanation of the drawing]

FIG. 1 is a plan sectional view of the first embodiment of the color changing device of this invention, FIGS. 2 and 3 are elevational views and side views of a switching valve common to the color changing device of this invention, and FIG. XX sectional view of Figure 2,
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. 7, 8, and 9 are explanatory views of the operation, and Fig. 10.
1)゜Figure 12 is a cross-sectional view of three types of coated wire rods made. In the figure, 1 is an extruder, 2 is an extrusion head, 3 is a switching valve, 20 is a material discharge path, and G4 is a linear coating. Applicant Mitsuha Seisakusho Co., Ltd. Figure 2 Figure 3 Figure 5

Claims (5)

[Claims] (1) A color changing device that changes the color of the material to be extruded and coated on the running wire to another color at any time, has two extruders that extrude materials of different colors, and a system that surrounds the running wire and applies the material to it. It includes an extrusion head for overlapping coating, and a passage switching valve provided in the material passage from each of the extruders to the extrusion head, and the switching valve has a cylindrical valve body in which a valve body in a valve box coaxially slides in a watertight manner. It consists of a rotating part and a fixed part, and one of the two passages having an entrance at a symmetrical position on the outer surface of the rotating part passes through the center of the interface between the rotating part and the fixed part and reaches the outer surface of the fixed part, The other path branches off in the middle and passes through a symmetrical position around the boundary surface, and then becomes unified and reaches the outer surface of the fixed part,
An apparatus for changing the color of extruded coated wire, characterized in that by rotating the rotating part by half a turn, the inlets of the rotating part communicating with each material inlet of the valve box are replaced. (2) The device according to claim (1), having discharged material receiving ports at two points on the same circumference as the two inlets of the rotating part and equidistant from both the inlets, and each of the receiving ports and a material discharge path extending in the axial direction along the circumferential surface of the rotating part by a certain distance and reaching the discharge port on the circumferential surface, and the discharged material receiving port communicates with each material inlet of the valve box. 1. A color changing device for extruded coated wire, characterized in that when the extrusion coated wire reaches the position, the discharge port communicates with a material discharge passage of the valve box. (3) In the apparatus according to claim (1), the extrusion head for overlapping and coating the running wire with materials is configured to cover the entire outer periphery of the running wire with one material, and then apply the other material on the entire surface of the running wire. 1. A color changing device for extruded coated wire, characterized in that the wire is coated in a shape. (4) In a color changing method in which the color of the material to be extruded and coated on the running wire is switched to another color at any time, one of the two extruders supplies the coating material of the color of the wire to be produced first, and the other extruder supplies the coating material of the color of the wire to be produced next. Coating materials of each color of the wire rod to be produced are extruded, the former material is layered and the latter material is sent to the upper layer material injection port of the extrusion head for coating, and the latter material is also sent to the lower layer material injection port to cover the running wire rod, and then each of the above materials is extruded. An extruded coated wire material characterized in that the passage switching valve of the color changing device according to claim (1), which is provided in the material passage from the extruder to the extrusion head, is switched to reverse the materials of the upper and lower layers. How to change colors. (5) In the color changing method according to claim (4), the running wire is an electric wire coated with insulating rubber in advance, and the upper layer and lower layer coated thereon are both colored in different colors for identification. A method for changing the color of an extruded coated wire material characterized by being a thin film.