JPS6234740Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a molding nozzle that can print a pattern on a synthetic resin molded product.

In the molding of synthetic resins, two types of resin materials with different colors are not kneaded in an injection cylinder, but are merged at a nozzle and then injected into a mold to form a molded product pattern. .

However, the pattern embossed on a molded product is determined by the positional relationship of two types of resin materials with different colors in the nozzle, and the position and proportion determined before injection from the nozzle opening are not directly applied to the molded product. It appears as a pattern on the item.

Therefore, a special structure is required to associate the two types of material resins that have been pumped without kneading from the hopper to the tip of the nozzle so as to form a desired pattern.

In the conventional technology, a member is provided at the confluence point of two colors of material resins to associate both of them, and various patterns are formed on the molded product depending on the shape of the member.
In the dual nozzle device as described in Japanese Patent Application Laid-Open No. 52-133362 and Japanese Patent Publication No. 55-2331, two
Since the confluence point of the seed resin is located away from the nozzle opening, and there is no means to separate the two types of resin close to the nozzle opening, the pattern formed there is a combination of the two types of resin. As a result of kneading, the boundaries become only blurred patterns with unclear boundaries, and it is considered extremely difficult to mold a molded product having a pattern with clear boundaries.

This idea was devised to eliminate the above-mentioned drawbacks of the conventional structure and to form a new pattern that cannot be obtained from the conventional structure. The present invention aims to provide a molding nozzle with a new structure that can create a linear pattern by mixing colors and that pattern is obtained by a core within the nozzle body.

This invention will be explained in detail below using illustrated examples.

In the figure, reference numeral 1 denotes a nozzle body, and a resin passage 3 is formed between it and a core 2 provided inside the nozzle body and having a conical tip. This resin passage 3 is divided into a required number of passages 3a, 3a by a plurality of axial ribs 5, 5 protruding around the tip of the core 2. Reference numeral 4 denotes a channel for the material resin for pattern formation, and a communication channel 4a is opened in a part of the channels 3a, 3a, and the channel is made into a channel through which two types of material resins A and B having different colors flow. There is.

In the embodiment shown in FIGS. 1 to 4, the core 2
In the case where a resin path 4 of material resin B is provided inside the
Four passages 4a, 4 with the resin passage 4 at the tip
A is connected to a part of the divided passages 3a, 3a, and the material resin A flowing through each passage 3a, 3a is mixed with the material resin B, which has a different color in the resin passage 4, and both flow through the nozzle port 6. It is designed to flow in the direction of.

In the embodiment shown in FIG. 5, the ribs 5, 5 are provided to the rear of the core 2 to form long passages 3a, 3a, and a resin passage is provided on the side of the nozzle body 1 at the rear of the passages 3a, 3a. 3 is connected, and a resin passage 4 provided on the side of the nozzle body ahead of the resin passage 3 is connected to a part of the passages 3a, 3a via a passage 4a.

Note that the number of divisions of the passage 3a can be arbitrarily selected depending on the shape of the molded product, and the number of patterns can be determined according to the shape of the molded product.
It is determined by the number of connections between a and the resin path 4.

Therefore, in the above structure, when the red material resin A for forming the molded product is pumped into the resin path 3 and the blue material resin B for pattern forming is pumped into the resin path 4, the material resin A is transferred to the path 3a, It is divided into several parts by 3a. Further, the material resin B is extruded from the passage 4a to the passage 3a, and slips into between the material resin A and the core 2. As a result, the flow of the resin material A is partially mixed with the resin material B, and moreover, the resin material B is shaped into a linear shape by the dividing passage. When the injection is performed from the nozzle opening 6, a linear pattern 8 appears on the molded product 7 made of the resin material A, as shown in FIG. The pattern 8 is radial on the surface perpendicular to the nozzle of the molded product 7, and vertical stripes on the parallel surface, and the color is a mixture of the colors of the two resin materials A and B. The color tone of this pattern 8 varies depending on the length of the distance from the position where the material resins A and B meet to the nozzle opening 6; the longer the distance, the more the mixing progresses, and the shorter the distance, the stronger the color of the material resin B becomes.
Furthermore, the clarity of the pattern 8 is different from that of the other passages 3a, 3a.
Each passage 3 depends on the merging position with the material resin A.
When a and 3a are formed up to the tip of the core and merge near the nozzle port 6, the line will appear in a sharp pattern, but the merging point will be at the nozzle port 6.
The further away the line becomes, the more indistinct it becomes.
It blends into the color of the material resin A that forms the molded product 7, forming a blurred pattern.

Note that when the passages 3a, 3a are formed diagonally, the pattern is twisted around the gate.

As mentioned above, this invention uses the resin path 3 formed between the nozzle body 1 and the core 2 within the nozzle body.
A required number of passages 3a, 3 at least at the tip of the core
A, and a part of the divided passages 3a, 3a and another resin path 4 are connected, and another material resin B is added to the material resin A forming the molded product 7, and the molded product is Since the required number of linear patterns 8 are formed in the nozzle, there is no need to provide a special member inside the nozzle body as in the past, and only the core is processed, which makes the nozzle structure particularly complicated. There is no such thing. In addition, the linear pattern and color tone can be varied by selecting the length of the dividing passage and the confluence point of the material resin, and the feature is that molded products with the same pattern can be obtained as long as there are no changes in the molding conditions. .

[Brief explanation of the drawing]

The drawings show an embodiment of the pattern forming nozzle according to this invention, and FIG. 1 is a vertical sectional side view of the first embodiment, FIG. 2 is a sectional view taken along the line of FIG. 1, and FIG. - Line sectional view, Figure 4 is a side view of the tip of the core, Figure 5 is a vertical side view of the second embodiment, Figure 6 is Figure 5 - line sectional view, and Figure 7 is a perspective view of the molded product. It is. 1... Nozzle body, 2... Core, 3, 4... Resin path, 3a... Passage, 5... Rib, 6... Nozzle opening, 7... Molded product, 8... Pattern.

Claims (1)

[Scope of utility model registration request] The resin passage formed between the nozzle body and the core within the nozzle body is divided into a required number of passages at least at the tip of the core, and a part of the divided passage is communicated with another resin passage. Nozzle for forming patterns.