JPS5811552Y2 - Multicolor molding nozzle - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a multicolor molding nozzle for molding multicolor plastic molded products.

Conventionally, when molding multi-colored synthetic resin molded products, synthetic resins of different colors were injected or extruded simultaneously or intermittently through predetermined channels in a molding machine, thereby molding multi-colored molded products. This type of molding method sometimes causes problems such as the flow of different colored synthetic resins shifting from one another, and there are problems such as insufficient reproducibility in pattern formation of multicolored molded products.

This invention was made to improve the above situation, and its purpose is to easily and reliably perform multi-color molding.
To provide a multicolor molding nozzle which can mold beautiful multicolor molded products with good reproducibility by using the multicolor molding nozzle of the present invention, has a simple structure, is easy to manufacture, and is inexpensive.

Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

In this embodiment, a four-color molding nozzle will be described as an example of the present invention.

In the figure, reference numeral 1 denotes a mold body for injection molding, and a housing part 3 for a four-color molding nozzle body 2 is formed at a predetermined location of the mold body.
The nozzle body 2 is housed in the nozzle body 2, and is fixed to the mold body 1 via bolts 4.

The nozzle body 2 has a small-diameter cylindrical portion 6 integrally protruding from the center of one end surface of a large-diameter cylindrical base 5, and a truncated conical portion 7 integrally protruding from the tip surface of the cylindrical portion 6. The truncated conical part 7 side is located inside the mold body 1, and the side and one end surface of the base 5, the outer peripheral surface of the cylindrical part 6, and the mother face of the truncated conical part 7 are The nozzle bodies 2 are accommodated in the housing portions 3 in close contact with the mold bodies 1, respectively.

Four guide grooves 8a, 8b, 8C, and 8d are cut out along the axial direction on the outer circumferential surface of the cylindrical portion 6 and are offset by approximately 90 degrees from each other, and the truncated cone Guide grooves 9a, 9b, 9:c, and 9d that are continuous with the respective guide grooves 8a, 8b, 8C, and 8d are cut out along the generatrix direction on the generatrix surface of the portion 6, and these guide grooves 9
Guide channels 1 in a, 9b, 9c, and 9d, respectively.
0 a , 10 b , 10 C, and 10 d are formed.

Moreover, each guide groove 8a, 8b, 8C of the said cylindrical part 6. 8d
The mold body 7 is cut out into a substantially rectangular prism shape corresponding to each of the guide channels 10a, 10b, IOC, 1.
Molding material chambers 11a, 11 communicating with 0d, respectively
b, 11C, lld are respectively formed, and each of these chambers 11a, 11b, 11C, 11d
are respectively injection units (
Port 12 of the mold body 1 communicating with a nozzle (not shown)
(Only one is shown in FIG. 1.

) are in communication with the respective molding material channels 13a, 13b, 13C, and 13d formed in the mold body 1, respectively.

In each of the chambers 11a, 11b, 11C, and 11d, there are spherical check balls 14a, 14b,
14C and 14d are interposed.

Further, in the mold body 1, the guide channels 10 a , 10 b , 10 C are formed from the distal end surface of the truncated conical portion 7 .
, 10d is formed, which leads to a mold gate (not shown) and communicates with a cavity (not shown).

In the figure, reference numeral 16 denotes a cartridge heater, and the other end surface of the nozzle body 2 is inserted into an insertion hole 17 formed along the axial direction from the center of the nozzle body 2, and is inserted into the respective molding material chambers 11a, 1.
1b, 11C, lld to each guide channel 10a, 1
The molten resin flowing through 0 b , 10 C, and 10 d is heated to maintain the temperature of these resins within a predetermined range.

In addition, 18 is a bolt insertion hole that connects the nozzle body 2 to the mold body 1.
The above-mentioned bolt 3 fixed to is inserted.

Next, a case will be described in which a four-color synthetic resin molded product is manufactured using the four-pack molding nozzle configured as described above.

First, resins of different colors (colors A, B, C, and D) are injected into the corresponding ports 12 from the nozzles of four injection units (all not shown).

Then, each resin flows from each port 12 into molding material flow paths 13 a and 13 that communicate with these ports 12, respectively.
After flowing through the respective molding material chambers 11a, 11b, 11C, 11d, the molding material flows into the respective chambers 11a, 11b, 11C,
11d inner wall and check balls 14a, 14b
, 14C, and 14d,
It flows into each guide channel 10a, 10b, 10C, and 10d, respectively.

And, each of these guide channels 10 a , 10 b , 1
0C, 10d The inflowing resin is guided by these and directed toward the final flow path 15, and each guide flow path 10a
, 10 b , 10 C, and 10 d and merge with each other when flowing into the final flow path 15, and the resins of different colors that had previously flowed independently through the predetermined flow path, As shown in FIG. 3, the resin flows into one resin flow consisting of the four colors A, B, C, and D, flows in the final flow path 15 as it is, flows into the mold cavity through the gate, and flows into the mold cavity with the four colors A, B, C, and D. Depending on A, B, C, D, gate position, cavity shape, etc., a beautiful multicolored molded product having a mixture of these four colors A, B, C, and D is molded.

Although the present embodiment has been described above limited to four-color molding, the number of guide grooves 8 and guide channels 10 provided in the cylindrical portion 6 and truncated conical portion 7 is not limited to four, but three or more can be provided in the present invention. Multicolor molding with three or more colors is also possible.

Furthermore, the shapes of the cylindrical portion 6 and the conical portion 7 are not limited to circles, and the same effects as described above can be obtained even if they are made into prismatic or pyramidal shapes.

Furthermore, in the case of the above embodiment, if resins of different colors are simultaneously flowed from each injection unit through the molding material flow paths 13b, 13c, and 13d, the final resin flow path 15 These resins merge, and a four-color molten resin material is formed in which the different-colored resins A, B, C, and D are bundled without mixing with each other, but the resin from either injection unit For example, each molding material flow path 13a, 13b, 13C, 13
If the resin is made to flow only from the two channels 13a and 13C among the channels d, the colors A and C will appear in the final resin channel 15.
A two-color molding material is obtained.

In this case, the molding material channels 13b and 13d, the molding material chambers 11b and 11d, and the guide channel 10b.

Resin does not flow into chamber 10 d, but each chamber 11 a, 11
There are check balls 14 in b, 11C, and lld, respectively.
a, 14b, 14C, and 14d, the resin is reliably prevented from flowing backward from the final flow path 15 through the guide flow paths 10b and 10d.

Therefore, the injection of resin from each injection unit is interrupted as appropriate, for example, the resin is first injected from each injection unit, the four colors of materials are merged in the final resin flow path 15, and this is caused to flow into the cavity. After that, if you interrupt the injection of resin from the two injection units consecutively to merge the two colors of material and allow it to flow into the cavity, you can create a beautiful pattern with a wide variety of colors. A multicolored molded article is formed.

Therefore, when injecting resins of different colors, the timing of the injection amount and the time pattern of injection and pause can be controlled independently, making it possible to form various multicolored molded products with good reproducibility. Multicolor molded products with various patterns can be easily molded with good reproducibility.

Furthermore, since the above-mentioned multicolor molding nozzle is incorporated into the mold body 1, there is no need to merge different color molding materials together in the injection unit as in the past. Since the resins are combined in the final flow path 15 and then immediately flow into the cavity, there is no inconvenience such as the component resins in the multicolor molding material being mixed and dispersed during the flow.
It is possible to reliably obtain a molded amount with a constant pattern.

Furthermore, the nozzle body 2 is maintained at an appropriate temperature by the cartridge heater 16, so that the temperature of the resin flowing in contact with the nozzle body 2 can be maintained at a good temperature.

Although the above embodiments have been described for obtaining injection molded products, they can also be used for extrusion molding, blow molding, etc. In this case, a four-color molding nozzle can be attached to the tip of the molding machine. .

In addition, in the above embodiment, the synthetic resin 4 merged in the final flow path
Although the explanation has been given on the case of molding a synthetic resin molded article using a colored molding material, the present invention can be similarly applied to other suitable molding materials, and the structure can be modified in various ways without departing from the gist of the present invention. As explained above, in the present invention, the tip side of the nozzle body for multicolor molding is formed into a cone shape or a frustum shape, and a plurality of holes are formed on the generatrix surface of this key part or frustum part along the generatrix direction. A guide groove is formed, and a guide passage is formed in each of these guide grooves, and the proximal ends of these guide passages are communicated with molding material passages through which molding materials of different colors flow, and each of the above-mentioned guides is formed. Since the tip side of the flow path is configured to communicate with the final flow path, molding materials of different colors flow sequentially through each of the molding material flow paths and each guide flow path, and join together at the final flow path. As a result, a multicolored molding material in which these different colored molding materials are bundled can be reliably and easily formed, and therefore, beautiful multicolored molded products can be molded with good reproducibility using this multicolored molding material. Such a nozzle has advantages such as being simple in structure, easy to manufacture, and inexpensive.

[Brief explanation of drawings]

The drawings show a preferred embodiment of the present invention; FIG. 1 is a sectional view taken along the line I-I in FIG. FIG. 3 is a sectional view showing an example of a multicolored molding material formed by the same example. 2...Nozzle body for multicolor molding, 7...
Fractional conical part, 9a, 9b, 9C, 9d----
Guide grooves, 10a, 10b, 10C. 10 d...-Guiding channel, 13 a, 13 b
, 13 C, 13d...-molding material flow path, 15.
...Guiding channel.

Claims (1)

[Scope of utility model registration request] The tip side of the nozzle body is formed into a conical or truncated conical shape,
A plurality of guide grooves are respectively formed along the generatrix direction on the generatrix surface of this conical part or frustum part, and a guide passage is formed in each of these guide grooves, and the proximal end side of each of these guide passages is formed. Each of the molding materials of a different color communicates with the molding material flow path through which the molding material flows, and the tip side of each guide flow path communicates with the final flow path, so that the molding material of a different color flows through each of the molding material flow paths and the final flow path. A multicolor molding nozzle characterized in that the flow passes through each guide channel sequentially or simultaneously and then merges with each other at the final channel.