JP3054879B2 - Molding method for composite color eyeglass frame parts - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an eyeglass frame part formed by injection, and more particularly to a color frame obtained by mixing materials of two or more colors.
Also, the present invention relates to a frame forming method for obtaining an appropriate pattern by mixing different colors.

[0002]

2. Description of the Related Art There are countless parts and finished products to be injection-molded. Among these molded products, there are many known molded products which form patterns by injecting two or more kinds of resins having different colors. I have. FIG. 4 shows a conventional injection molding method, in which a mold is inverted and a secondary molded article is injected from a nozzle B to a primary molded article injected from a nozzle A and molded. Here, if the colors of the resin injected from both nozzles A and B are different, a two-color molded product is obtained. FIG. 5 also shows a conventional injection method, called a core back method, in which primary molding is performed from a nozzle A in a state where the core is pushed up, and then a second molding is performed from the nozzle B in a state where the core is retracted. Next molding is performed. Also in this case, if the colors of the resin injected from the nozzles A and B are different, the secondary molded product is molded as a two-color pattern. However, in such a molding method, the color is different only at a certain area,
It is hard to say a pattern. In order to obtain a finer two-color pattern, nozzles A and B that inject resins having different colors
6 and a method of ejecting from a single joining nozzle. FIG. 6 shows a conventional example. In such a method, the nozzles A and B can be simultaneously and continuously injected, and the resin can be intermittently injected from the nozzle A or the nozzle B. In contrast to the method shown in FIG. 5, a pattern showing a series of flows is obtained.

[0003] However, even with this injection method, the mixture is mixed at the nozzle orifice, and the pattern formed due to the distance to the cabin is coarse or conversely completely kneaded. Because the pattern cannot be formed, the pattern cannot be applied to small parts such as eyeglass frames. Of course, a resin frame having a pattern is known, but it is not a molded frame, but is cut out from a pattern plate material of a predetermined thickness and is made through a polishing process, so that the number of processing steps is high and the cost is inevitably high. Becomes Further, in the frame processed in this manner, the pattern is monotonous, and it is impossible to obtain a pattern suitable for the design of the glasses frame.

[0004]

As described above, the conventional injection molding has the above-mentioned problems. The problem to be solved by the present invention is these problems, and a molded eyeglass frame having a fine pattern and a molding method thereof are provided.

[0005]

The molded spectacle frame and its parts according to the present invention form a predetermined pattern by being molded by mixing resins having two or more colors. That is, it is a molded spectacle frame having a pattern, and the type of color forming the pattern is arbitrary. By the way, in order to form a fine pattern with such a composite color resin, a plurality of injection ports (gates) are formed in a cabin in a mold, and resins having different colors are simultaneously injected from these gates. . In this case, the gate position and the direction thereof are determined so that the resins injected into the cabin are mixed with each other, that is, the predetermined area is not filled in one side.

[0006]

As described above, resins of different colors are respectively injected from the gates provided at a plurality of places and filled in the cabin. At this time, the resins flowing from the respective gates are mixed with each other in the cabin. Will be. Therefore, the pattern formed on the molded eyeglass frame is fine and appears with a random shape, the position of the gate,
Various patterns can be obtained by changing the number, the injection speed, and the like. Hereinafter, embodiments according to the present invention will be described in detail with reference to the drawings.

[0007]

FIG. 1 shows a part of a mold according to the present invention. FIG. 1 is a schematic diagram for explanation, wherein 1 is a spool, 2 is a runner, 3 is a gate, and 4 is a gate. Show cabin. A nozzle port into which the nozzle tip is fitted is provided at one location of the spool 1, and the runner 2,
.. Extend vertically, and gates 3, 3,... Provided in places of the runner 2 communicate with the cabin 4. Here, the cabin 4 is represented by a rectangular frame for convenience, but is actually formed into a shape capable of forming a front frame or a crane of an eyeglass frame. Therefore, the color resin injected from the tip of the nozzle flows into the spool 1, enters the runners 2, 2, 2 from the spool 1, and is injected into the cabin 4 through the plurality of gates 3, 3,. By the way, as is clear from the figure, the gates 3, 3,... Communicating with the cabin 4 are arranged on both sides thereof, and the color of the resin injected from the gates 3a, 3a,. The two spools 1a, 1b are cabins 4, 4,
Are provided on both sides with a spool 1a, 1b
2a, 2b, 2b, ... extending from the cabins 4, 4, ..., respectively, and the gates 3a, 3a ... are run from the runner 2a to the gates 3b, 3b.
... extend from the runners 2b, and the cabins 4, 4
In communication with Therefore, cabin 4 has gate 3
a, 3a,..., 3b, 3b are mixed with each other and filled. Here, the spools 1a and 1b, the runners 2a, 2a and 2b, 2b, and the gates 3a, 3a and 3b, 3b ... may be formed on the fixed mold side. They can be formed separately from each other in the mold.

FIG. 2 shows another embodiment of the present invention, in which two runners 2a, 2b are connected to gates 3aa, 3a.
Through b, 3ba and 3bb, it communicates with a cabin 4 shaped to form a modern to be inserted into the tip of the crane of the metal frame. Runner 2a is the upper mold, runner 2
b is provided in the lower mold, and a resin of a different color is injected and filled through the gate 3 into the cabin 4 formed in each of the upper and lower molds.
b, cabin 4 so that 3ba and 3bb cross each other.
In the inlet area 5 of the cabin 4, the injected resin mixes with each other to fill the other area. Since the gates 3a, 3a... And the gates 3b, 3b... Are arranged at equal intervals in FIG. 1 of the above-described embodiment, each resin injected from these gates 3a, 3a. At the same time, they are mixed with each other after entering the cabin 4. However, in this case, unevenness occurs in the mixing state, and the mixing cannot be performed almost uniformly in the entire area of the cabin 4. On the other hand, in the case of the mold structure shown in FIG. 2, the mixture is mixed at the same time as the injection and fills the entire area of the cabin 4 in the mixed state. Of course, if they are completely evenly mixed, it is not possible to create a pattern, so some non-uniformity is required, but such a mixed state depends on the design required for each eyeglass frame Which case is preferable must be selected each time, and the mixing state greatly changes depending on the injection speed.

FIGS. 3A and 3B are partially enlarged views of the eyeglass frame formed by the present invention and parts thereof. If injection molding is performed using two kinds of resins having different colors, the pattern shown in FIG. Is formed. a is the case of the mold structure shown in FIG. 1, and the formed pattern is drawn clearly and the boundary area is relatively clear. b is the case of the mold structure shown in FIG. 2, in which the two resins are almost completely mixed and molded in a uniform state, so that the formed pattern is a group of thin curved lines, and a relatively blurred pattern is formed. Present. Here, the term “resin” is broadly understood, includes all materials that are suitable as the material of the eyeglass frame and can be molded, and is generally a plastic material. As described above, the present invention is a method of providing a plurality of gates communicating with the cabin of a molding die, and simultaneously injecting two or more types of resins having different colors from each gate, and molding the same. The following effects can be obtained for frames obtained by the method.

[0010]

The present invention relates to a technique capable of forming a pattern on a molded eyeglass frame or frame parts by injection molding. In comparison, its productivity is very high and its cost is very low. If the position and direction of the gate communicating with the cabin and its injection speed are sometimes determined appropriately, the mixing state of the injected resin is adjusted in any way, and the resulting pattern changes in various ways, and the eyeglass frame The most suitable pattern can be made. In this respect, the conventional method of cutting and processing a plate material like the conventional method can only obtain the same pattern,
This is a great advantage of the present invention.

[Brief description of the drawings]

FIG. 1 shows an embodiment of a mold for molding an eyeglass frame according to the present invention.

FIG. 2 is an embodiment of a mold for molding an eyeglass frame according to the present invention.

FIG. 3 is a specific example of a pattern formed on the glasses frame of the present invention.

FIG. 4 shows a conventional core rotation type injection method.

FIG. 5 shows a conventional core-back injection method.

FIG. 6 shows a conventional nozzle structure.

[Description of symbols] 1 spool 2 runner 3 gate 4 cabin 5 entrance area

Claims (1)

(57) [Claims] In injection molding for molding parts of an eyeglass frame, a cabin formed in a molding die is provided with gates at two or more places, and resins and the like having different colors are simultaneously injected from the gates. The gates communicating with the cabin are crossed in the vicinity of the cabin entrance, and the resin and the like injected in the cabin entrance area are mixed almost evenly to form a pattern, thereby forming a composite color eyeglass frame part. Method.