JPS603976B2 - How to create multicolored patterns - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention uses a multi-tube injection molding machine to simultaneously inject moldable synthetic resins of different colors, so that parts of adjacent resins of different colors are stacked on each other. The present invention relates to a method for producing a multicolor pattern that makes it possible to produce a multicolor pattern corresponding to twice the number of colors.

The conventional method of producing two-color patterns is to use a two-tube injection molding machine and alternately inject synthetic resins of different colors into the injection mold from each heated injection tube. Therefore, in the case of a side gate, as shown in molded product 1 shown in Fig. 1, resins 3 and 4 of different colors are clearly separated in an arc shape around gate 2 located on the side of molded product 1. In the case of pin gates, resins 3 and 4 of different colors are arranged in rings, respectively, with the gate 2 located in the center of the molded product 5 as the molded product 5 shown in FIG. It had drawbacks such as the fact that the shapes were clearly separated from each other, and the color pattern was extremely monotonous.

The method according to the present invention relates to a completely new technique that fundamentally improves the drawbacks of the prior art.

To specifically explain one embodiment of the present invention with reference to the drawings, the third embodiment
In Figures 6 to 6, 6 is a female mold of the injection mold, 7 is a male mold corresponding to the female mold 6, and inside these are a nozzle connecting part 8, a wound channel 9, and a flow branch. Dividing wall 10, branch passage 11
, a sprue 12 and a cavity space 13 are formed, respectively. Reference numeral 14 denotes a nozzle body for supplying the respective molten resins injected from three heating cylinders (not shown) to the runner 9 of the mold, and inside the nozzle body, the molten resin injected from the three heating cylinders (not shown) is fed to the runner 9 of the mold. A split torpedo 15 is built in, which can integrally apply the molten resin to the wound canal 9 in a mutually independent state without mixing them alternately, and around the nozzle body 14 there is a split torpedo 15. A band heater 16 is wound around it.

Further, as is particularly clear in FIG. 4, the torpedo 15 is provided with three pairs of separation passages a, b, and c, respectively, in its interior, and a central portion thereof is provided with a separate passageway b for forming the separation passageway b. It is constructed by inserting a torpedo insert d. Next, the steps for carrying out the method of the present invention will be explained in order.
Synthetic resins of different colors are injected from the heating cylinders into the three pairs of separation passages a, b, and c of the dividing torpedo 15 of the nozzle body 14 at the same speed, respectively, as shown in the cross-sectional shape of the dividing torpedo 15. While maintaining the state of not merging, the fluid flows, merges for the first time in the space e at the tip of the nozzle, is pushed out into the flaw 9 of the mold, and is further divided into two parts on the left and right by the dividing wall 10.
It is divided and dispersed through the fan-shaped distribution passage 11 and filled into the cavity space 13 from the sprue 12,
When the three-colored synthetic resins a', b', and c' are formed in their respective colors, or when the synthetic resins a' and c' have translucence, the color changes while flowing. By laminating the ends of adjacent resins of different colors, it is possible to obtain a cotton pattern-like five-color molded product 17 displayed in mixed colors.

The reason why adjacent different colored resins are partially laminated as described above is that in the past, different colored resins were filled in the order of the pattern, but in the present invention, the divided torpedo 15 having several separation passages is used. The injected different colored resins merge together at the nozzle connecting part 8 and are pushed out into the wound canal 9.
Next, the flow dividing wall 10' is pressed against it to divide it into left and right sides, and the direction of the flow is changed.
During pressure flowing through the medium and narrow sprue 12, the ends of the resin are partially laminated with each other due to changes in the flow of the resin and the pressure flow.

The molded product 17 molded as described above has a', a'+b', b
Five hues of ', c'+b', and c' appear, and for example, in the color part of a'+b', the part close to a' has a color close to a', and the part close to b' has a color close to a'. It is possible to make a changed color appear which has a color gradually closer to b' as it gets closer.

In the above embodiment, the flow-in molten synthetic resin was divided into two by the flow dividing wall 10, but it is possible to obtain four, six, etc. by dividing it into four, six, etc.

Furthermore, as shown in FIG. 7, when the split torpedo 15 is made into a screw shape, a six-color molded product 18 is obtained in which six colors appear in a striped pattern as shown in FIGS. 8 and 9. I can do it.

Moreover, when the sprue 12 is brought to the corner of the side surface of the cavity space 13 instead of being brought to the entire side edge of the cavity space 13 as in the above embodiment, the pattern turns as shown in FIG. A swirl pattern multicolored molded product 19 can be obtained, and the sprue 1
Bring 2 to the center of the ceiling surface of cavity space 13 and
In the case of individual molding, it is possible to mold a radial multicolored molded product 20 as shown in FIG. In the method according to the present invention, a nozzle body with a built-in split torpedo is provided between the wound path of the mold and a plurality of heated injection tubes, so that the molten resin of several colors injected from the injection tubes into the nozzle body can be It flows while maintaining the same shape as the divisions of the divided torpedo, and is supplied to the wound tract while merging at the space at the tip of the nozzle. It is then dispersed through the runner, divided flow wall, and divided passage, and fills the cavity space from the sprue. It is possible to automatically and inexpensively mass-produce molded products with multicolored patterns in which adjacent parts are laminated mutually and have a moat color.
There is no need to alternately and intermittently inject and stop the injection of molten resin in individual heating cylinders, making it possible to continuously inject synthetic resin from multiple heating cylinders simultaneously at the same speed for molding. Moreover, depending on the shape of the dividing wall, it is possible to form any number of molds, and depending on the installation position of the sprue, it is possible to freely mold molded products with various color patterns such as cotton patterns, swirl patterns, and radial patterns. It is possible, and furthermore, the molded product is not clearly divided into colors as if the parts of different colors were pasted together, as in the past, but the boundary parts of adjacent colors are a mixture of both colors. It has the advantage of being able to gradually change its color, and is characterized by the ability to obtain high-quality products with extremely multicolored patterns.

[Brief explanation of the drawing]

FIGS. 1 and 2 are explanatory diagrams of a conventional product, FIGS. 3 to 6 are explanatory diagrams showing an embodiment of the present method, and FIGS. 7 to 11 are explanatory diagrams showing other embodiments. be. 1, 5: conventional molded product, 6: female type, 7: male type, 9: runner, 10: dividing wall, 12: sprue, 13: cavity space,
14: Nozzle body, 15: Torpedo, 17...
・20: Molded product, a, b, c: Separation passage, a', b',
c': Synthetic resin. Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Figure 7 Figure 8 Figure 9 Figure 10 Figure 11

Claims (1)

[Claims] 1. A nozzle body with a built-in dividing torpedo is interposed between the injection mold and the plurality of heating injection tubes, which constitute the runner, the dividing wall, the distribution passage, and the sprue cavity space. The different molten resins are simultaneously made to flow while maintaining the same shape as the partition of the separation passage inside the split torpedo, and then they are merged in the space of the nozzle body and injected into the runner of the mold. The resin is divided into left and right parts by a dividing wall installed at the center facing the exit of the road, and the resin is dispersed through the dividing passage while being injected into the cavity space through a narrow sprue, thereby dissolving adjacent different colored resins. A method for producing a multicolor pattern characterized by molding a multicolor pattern molded product in which parts of the product are laminated to form a striped pattern.