JPS5826110Y2 - Multicolor molding nozzle - Google Patents

Description

[Detailed description of the invention] This invention is for four-color molding equipment that injects each resin of a different color into a cavity in a mold using four injection units to form a molded product in which resins of each color are mixed. It concerns the nozzle.

When molding various designs, letters, etc. using different colored resins, multiple injection units are used to inject different colored resins into cavities within the mold to achieve multicolored molding.
Recently, there has been a demand for multi-colored molding in which resins of three or more colors are mixed together in order to make designs more complex or to increase the decorative effect.

In the case of multi-color molding, an injection unit is required for each color.For example, four injection units are required for four-color molding, but the injection unit itself has the function of melting and injecting the resin. Since the mold is quite large and the molten resin must be injected directly into the cavity, the injection unit must be located within a predetermined distance from the fixed mold.

However, conventional injection molding equipment mainly focuses on the back side of the fixed mold (
The injection unit was placed on the opposite side of the movable mold, but
This space is limited, and the injection unit must be located within a predetermined distance from the fixed mold, and as mentioned above, the injection unit is quite large, so a large number of injection units are arranged in the above space. It is difficult to do so.

In addition, there is a conventional two-color molding machine that has two injection units arranged side by side and placed behind a fixed mold, but this molding machine can perform two-color molding at the same time, but it can also perform multi-color molding such as three or four colors. Molding cannot be done at the same time.

Furthermore, in the conventional multicolor molding method, it is difficult to form a multicolor pattern in which four or more colors are mixed irregularly.

The present invention was developed to improve the above-mentioned situation, and its purpose is to be able to form a four-color molding in which four colors are mixed in a complex manner in one step, and at the same time to reduce the size of the entire molding device. The present invention aims to provide a four-color molding nozzle that enables the formation of four colors.

Hereinafter, the present invention will be described with reference to embodiments shown in the drawings.

First, an example of a device for carrying out the present invention is shown in Figs. 1a and b.
This will be briefly explained using .

Note that figure a is a top view of the device, and figure b is a side view.

1 in the figure is a machine base, a cylinder 2 is fixed to the side of this machine base 1, a movable platen 4 is fixed to the tip of a ram 3 connected to the piston of this cylinder 2, and this movable platen 4 is used as a guide. Bar 5
It is designed to move back and forth while being guided by.

A fixed platen 6 provided opposite to the movable platen 4 is fixed on the machine base 1, and a movable mold γ and a fixed mold 8 are mounted on opposite sides of the two plates 4 and 6, respectively. The movable mold 7 is fixed and reciprocated by the cylinder 2, and the movable mold I is separated from the fixed mold 8 or brought together, and when both molds 7 and 8 are brought together, the inside of these molds A cavity 9 is formed therein.

As shown in FIGS. 2 and 3, the stationary platen 6 has a recess 61 formed therein that matches the shape of the mixing nozzle mechanism 140 so as to accommodate a resin mixing nozzle mechanism 140, which will be described later.

In addition, in FIG. 2, the mixing nozzle mechanism 14 is installed in the recess 61 of the fixed plate 6.
0 is attached to the four-color molding nozzle of the present invention, a is a front perspective view, b is a sectional view in the AA' direction of a,
C is a sectional view of a in the BB' direction, d is a sectional view of a in the c-c' direction, and FIG. 3 is a sectional view of the stationary plate 6, and b is a rear perspective view thereof.

This fixed platen 6 has a resin mixing nozzle mechanism 14004 which will be described later.
four through-holes 6a each connected to the resin inlet;
6b, 6c, 6d and four cylindrical or prismatic notches 62a, 62b, 62 communicating with the through holes.
c, 62d are formed.

On the other hand, the general shape of the resin mixing nozzle machine groove 140 is as shown in FIG.
A trapezoidal part 143 in the shape of a truncated cone protruding from the tip end surface of 42 is coaxially and integrally formed.

In addition, from the following description, this resin mixing nozzle mechanism 14
The dense part 141 is called the large-diameter disc part 141. The column part 142 is a small diameter column part 1.
42 and the trapezoidal portion 143 will be respectively referred to as a truncated cone portion 143.

In addition, as shown in FIG. 2, the resin mixing nozzle mechanism 1400
The truncated conical part 143 side is located inside the fixed platen 6, and the outer peripheral surface of the small diameter cylindrical part 142 and the mother face of the truncated conical part 143 are in close contact with the concave part 61 of the fixed platen 6, as shown in FIG. A nozzle mechanism 140 is housed in the fixed platen 6.

By accommodating the mixing nozzle mechanism 140 in the recess of the fixed platen 6, four cylindrical or prismatic notches 62a are formed on the mother face of the small diameter cylindrical part 142 of the mixing nozzle mechanism 140 and on the fixed platen 6.

Four cylindrical or prismatic chambers are formed by 62b, 62c, and 62d.

These four chambers will be explained in detail later, but each chamber accommodates a change ball, and serves as a backflow prevention valve that prevents the backflow of resin.

The structure of the multicolor molding nozzle of the present invention and the resin mixing nozzle mechanism 140 of the nozzle will be described in detail below with reference to FIGS. 6 and 7.

As described above, the nozzle mechanism 140 of the multicolor molding nozzle of the present invention consists of a large diameter disc part, a small diameter cylindrical part, and a truncated conical part, which are integrally formed.
Of the colored resins, the first colored resin is injected into the first resin flow path provided along the central axis of the nozzle mechanism, and the second and third colored resins are injected into the truncated conical part of the nozzle mechanism. Two second holes are formed on the base surface. The resin of the fourth color is injected into the fourth resin flow path dug between the central axis of the nozzle mechanism and the mother face of the truncated conical part.
The third and fourth resin flow paths are merged into the first resin flow path, and the resins of four colors are merged into one resin flow path, and then the resin is injected and filled into the cavity.

In order to clarify the structure of the four-color molding nozzle of the present invention, Fig. 6 shows the nozzle mechanism disassembled to show the shape of each member.■ is the center member 144, ■ is the intermediate member 145, and III is ■ The state where ■ is fitted in, ■ is the outer shell member 146, and V is ■
Figure 7 shows the state in which ■ is inserted into the fixed plate 6.
In addition, A is a side external view of each member, B is a cross-sectional view of A in the x-x' direction, and C is a Y-Y' of B.
D is a sectional view of A in the zz' direction, and nE is a sectional view of the intermediate member H in the FW' direction.

First, the central member 144 has a single through passage 144-1 opened along the central axis of the truncated cone as shown in (2), and this through passage serves as the aforementioned first resin flow passage.

Furthermore, two grooves 144-2, 14-2 are provided on the mother surface of this central member.
4-2' is provided, and the shape of this groove is arbitrary, but in FIG. 6 it is U-shaped.

Furthermore, a resin inlet 144-3 is formed in this central member 144 and communicates with the through passage 144-1.

Next, ``■'' is an intermediate member 145, which has a truncated cone shape with a cylindrical bottom and is hollow inside.

The center member 144 is inserted into this intermediate member 145, and the mother surface of the center member 144 is in close contact with the inner wall surface of the intermediate member 145.
Be embodied.

A cutout groove 145-1, which is slightly longer than a semi-circumference, is formed along the circumference of the cylindrical portion of the intermediate member 1450.

Further, this intermediate member 145 has two grooves 144-2, 144-2' of the central member 144 and the notch groove 145-.
Two through passages 145-2, 145-2 communicating with 1.
' is provided.

Furthermore, a resin inlet 145-3 is formed in this intermediate member 145 and communicates with the resin inlet 144-3 of the central member.

■I change I to H, that is, the center member 144 is replaced by the intermediate member 145.
FIG. 3 is a sectional view showing a state where the parts are fitted and integrated.

Next, ``■'' is an outer shell member 146, which has a truncated cone shape with a cylindrical bottom and is hollow inside.

The intermediate member 145 is inserted into the outer member 146, and the base surface of the intermediate member 145 is closely integrated with the inner wall surface of the outer member 146.

Two grooves 146-1 and 146 are provided on the mother surface of the outer shell member 146.
-1' is notched.

Furthermore, this outer member 146 has a resin inlet 146-3 that communicates with the resin inlet 145-3 of the intermediate member, and a resin inlet 14 that communicates with the notch groove 145-1 of the intermediate member.
6-2 is formed.

■ is a cross-sectional view showing a state in which ■ is fitted into ■ and integrated, and as understood from V-B, V-C, and V-D, it communicates with the resin inlet 146-2 provided in the outer shell member. The notched groove 145-1 of the intermediate member has two through passages 145-2, 145-2' dug into the intermediate member and two grooves 144- cut out in the mother surface of the central member. 2,14
4-2' to a through hole 144-1 provided along the central axis of the central member.

This 146-2゜145-1, 145-2 and 145-2
The resin flow path composed of ', 144-2, and 144-2' becomes the fourth resin flow path described above.

The four-color molding nozzle of the present invention is completed by accommodating each member integrated as described above in the recess of the stationary platen 6 as shown in FIG.

FIG. 7 is a cross-sectional view of the nozzle mechanism 140 housed in the fixed platen 6, and B corresponds to FIG. 6 V-B and C corresponds to FIG. 6-C.

As understood from FIG. 7B, by inserting the outer shell member 146 into the fixed platen and closely integrating the outer shell member 146, the outer shell member 146 is
Two grooves 146-1, 1 cut out in the mother surface of 46
The gap formed between 46-1' and the inner wall surface of the fixed platen 6 is the second gap described above. It becomes the third two resin flow paths, and the central member 1
It communicates with a first resin flow path provided along the central axis of 44.

Furthermore, in the figure, reference numeral 141 denotes a disk constituting a large-diameter disk portion of the resin mixing nozzle mechanism 140, and four cylindrical or prismatic notches 62a are formed in the stationary plate 6 by closely integrating it with the stationary plate 6. , 62b, 62c, and 62d are four independent chambers, and check balls 10a, 10b, 10c, and 10d for preventing backflow are housed in these chambers.

As described above, the cylindrical chamber 62a1 of the through hole 6as and the first resin flow path 144-1 communicate with each other, and similarly the through hole 6b,
The cylindrical chamber 62b1, the second resin flow path 146-1, and the first resin flow path 144-1 communicate with each other, and similarly, the through hole 6
d, the cylindrical chamber 62d1, the third resin flow path 146-1' and the first resin flow path 144-1 are in communication, and the through hole 6cs, the cylindrical chamber 62c1, the fourth resin flow path and The first resin flow path 144-1 is in communication.

The operating conditions of the four-color molding machine using the four-color molding nozzle of the present invention described above will be explained below.

There are four injection units 11a around the fixed platen 6.

11b, 11c, and 11d, and each of the injection unit lifts 11 extrudes the resin of each color A, B, C, and D housed in the ompper with a screw while melting it within the injection unit main body. Molten resin is injected from the nozzle.

Four injection units 11a, 1 lb, 11c. 11d
Resin containing colorants of different colors A, B, C, and D is injected from the injector.

Note that the resin materials injected from the four injection units must be the same or compatible.

The A-colored resin from the injection unit 11a whose nozzle is inserted into the through-hole 6a of the fixed platen 60 flows into a cylindrical or prismatic chamber 62a communicating with the through-hole 6a.
2a along the central axis of the nozzle mechanism 140.
The resin flows into the resin flow path 144-1.

Next, the B and D color resins from the injection unit 1 lb and lid pass through the fixed platen 60 through holes 6b and 6d, the cylindrical chambers 62b and 62d, and pass through the second nozzle mechanism 140, which is cut out on the mother surface of the nozzle mechanism 140.゜Third resin flow path 146-1
and 146-1' respectively, and the first resin flow path 14
It flows into 4-1.

Furthermore, the C-colored resin from the injection unit 11c is passed through the through hole 6c.
The resin passes through the s-cylindrical chamber 62C, passes through the third resin flow path dug between the mother surface and the central axis of the nozzle mechanism 140, and flows into the first resin flow path 144-1.

In this way, the resins of color A, color B, color 0, and color D are combined and filled into the cavity 9 formed by the fixed mold and the movable mold.

As described above, a four-color molded product is formed in which the four-color resins A, B, C, and D are mixed irregularly within the cavity.

In the multicolor molding method described above, the color tone of the molded product can be changed by controlling the injection amount of resin for each injection unit.

In addition, the four-color molding nozzle of this invention merges the four-color resin into the same flow path and then injects it into the cavity from the nozzle, so the molded product has a beautiful pattern in which the color tones are mixed irregularly in a spiral shape. is obtained.

In this embodiment, the case where one molded product is molded at a time has been described above, but this is not limited to one molded product, and it goes without saying that a plurality of molded products can be molded at one time.

Furthermore, although the description has been given of an injection unit that uses a screw as a resin transfer means, various injection units using plunger-type or other transfer means have been devised, and it goes without saying that the present invention can utilize these.

Furthermore, although an embodiment has been shown in which four injection units are arranged on the plane of the machine stand 1 and in a direction perpendicular to this plane, the arrangement positions of the injection units are not limited to this embodiment (the machine stand 1 Even if it is arranged in a direction that has a certain angle to the plane of the plane, the purpose of the present application will not be impaired.

In this embodiment, a case has been described in which the resin mixing nozzle is composed of a large-diameter disk portion, a small-diameter cylindrical portion, and a truncated conical portion, but the nozzle mechanism portion of the present invention is not limited to a circular shape.

That is, even if the disk portion is formed as a square disk, the cylindrical portion is formed as a square column, and the truncated cone portion is formed as a truncated pyramid, exactly the same effect as that of the present invention can be obtained.

Furthermore, when resin is simultaneously injected from four injection units, there is no risk of resin backflow, so there is no need to provide a backflow prevention valve.

In summary, the present invention includes a first resin flow channel provided along the central axis of a resin mixing nozzle, second and third resin flow channels cut out along the base surface of the mixing nozzle, and a resin flow channel provided along the center axis of the resin mixing nozzle. a fourth resin flow path dug between the surface and the central axis;
2nd and 3rd in the resin flow path. The fourth resin flow path is communicated, and the resins of four colors are once merged into the same resin flow path from four injection units, and then injected into the cavity to mold a four-color molded product with synthetic resin. It is characterized by the following.

Therefore, four injection units can be placed at predetermined positions on the fixed platen, and each injection unit can inject each color of resin into the cavity for molding, making it possible to mold four colors in one process. Therefore, the molding process can be shortened.

Furthermore, in the four-color molding nozzle of this invention, the resins of each color are combined into the same flow path and then injected into the cavity from one nozzle, so the resins of each color do not mix randomly, but the pattern is a spiral. It is possible to obtain molded products with beautiful, delicate, and subtly changing patterns that are large and have irregularly mixed color tones.

Further, since each injection unit can be arranged compactly around the fixed mold, the entire apparatus can be made relatively compact, which is an excellent effect.

Note that the nozzle of the present invention includes a nozzle structure for multicolor molding of four or more colors depending on the performance and type of the molding machine.

[Brief explanation of the drawing]

Figure 1 is a schematic diagram of a molding device using the four-color molding nozzle of the present invention, Figure 2 is the four-color molding nozzle of the present invention, and Figure 3 is a fixing that constitutes the four-color molding nozzle of the present invention. Figure 4 is a schematic diagram of the resin mixing nozzle mechanism that constitutes the four-color molding nozzle of the present invention, and Figure 5 shows the resin mixing nozzle mechanism shown in Figure 4 inserted into the fixed plate shown in Figure 3 and integrated. FIG. 6 is an exploded view of the resin mixing nozzle of FIG. 4, and FIG. 7 is a sectional view of the four-color molding nozzle of the present invention. 6...Fixed plate, 6a, 6b, 6c,
6d...Penetration opening.

Claims (1)

[Scope of utility model registration request] Large-diameter disc-shaped or rectangular disc-shaped dense part 141, this dense part 1
A small-diameter cylindrical or prismatic column part 142 protruding from one side of the column 141, and a truncated cone-shaped or truncated pyramid-shaped trapezoid part 143 protruding from the tip surface of the column part 142 are formed coaxially and integrally. a mixing nozzle mechanism 140;
Recess 61 that tightly fixes this resin mixing nozzle mechanism 140
The resin mixing nozzle mechanism includes a first resin flow section provided along the central axis of the trapezoidal section and the columnar section, and a fixed platen 6 having a first resin flow section cut along the main surface of the trapezoidal section. The first resin flow path has two or more resin flow channels formed with notches, and a resin flow channel dug between the center axis and the main surface of the trapezoidal part, and the first resin flow path has another resin flow path. A multicolor molding nozzle characterized by all channels communicating.