JP2022073659A - Model parts and manufacturing method of model parts - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a model part having a stable quality base layer visible from the outside and a method for manufacturing the same.
SOLUTION: A first layer formed of a first material of a first color and a second layer formed so as to cover at least a part of the first layer, the second layer. A model part having a second layer made of a second material of color, wherein the melting point of the first material is higher than the melting point of the second material, and the first layer is the first layer. It is visible from the outside through the two layers.
[Selection diagram] Fig. 1

Description

The present invention relates to a model part and a method for manufacturing the model part.

When coloring the face of an assembled model (also called a part), which is a so-called plastic model (registered trademark), for example, when coloring the face of a toy, it is painted in one place, by hand, or in the colored part. A mask provided with an opening is used for painting with a spray (see Patent Document 1). Further, there has been proposed a method in which painting is automated by using a coloring device provided with a plurality of printing machines and a conveyor (see Patent Document 2).

Jitsufuku No. 3-34226 Gazette Japanese Unexamined Patent Publication No. 8-47585

However, skill is required to apply a gradation that gradually darkens the color, and it is difficult to stabilize the quality. In addition, when a coloring device for painting is used, there are problems that additional capital investment and equipment increase in size. In addition, it has been difficult to manufacture model parts in which the base layer of stable quality can be visually recognized from the outside.

Therefore, an object of the present invention is to provide a model part having a stable quality base layer visible from the outside and a method for manufacturing the same.

The invention of model parts
With the first layer formed of the first material of the first color,
It has a second layer formed so as to cover at least a part of the first layer, and has a second layer made of a second material of a second color.
The melting point of the first material is higher than the melting point of the second material.
The first layer is visible from the outside through the second layer.

The invention of the manufacturing method of model parts
The first step of forming the first layer using the first material of the first color, and
A second step of forming the second layer using the second material of the second color so as to cover at least a part of the first layer.
Including
In the second step, the second layer is molded before the first layer is cooled to room temperature.
The melting point of the first material is higher than the melting point of the second material.
The first layer is visible from the outside through the second layer.

According to the present invention, it is possible to provide a model part having a stable quality base layer visible from the outside and a method for manufacturing the same.

It is a flowchart which shows an example of the manufacturing method of the model part corresponding to the embodiment of an invention. It is a figure for demonstrating the molded article manufactured according to the manufacturing method of the model part corresponding to the embodiment of an invention. It is a figure for demonstrating the structure of the model part corresponding to the embodiment of an invention. It is a figure for demonstrating the cross-sectional structure of the model part corresponding to the embodiment of an invention.

Hereinafter, exemplary embodiments of the invention will be described with reference to the drawings. In each figure, the same reference numerals indicate the same elements. Further, in each drawing, the vertical / horizontal direction on the paper surface is used as the vertical / horizontal direction of the part (or part) in the present embodiment in the description in the text. In the embodiment described below, the present invention uses ABS (Acrylonitrile / Butadiene / Styrene) resin and SBC (styrene / butadiene) copolymer as molding materials. (Copolymer), styrene-based special transparent resin), etc. are exemplified, but not limited to this, and the use of other materials (thermoplastic resin such as polyethylene, thermosetting resin, soft resin, metal, etc.) is excluded. not.

First, a method of manufacturing a model part corresponding to an embodiment of the invention will be described with reference to the flowchart of FIG. In S101, the primary molding for forming the primary molding layer constituting the skeleton portion of the model part is performed. ABS can be used as the molding material (material) of the primary molding layer. Next, in S102, the secondary molding for forming the secondary molding layer is performed on the surface of the primary molding layer before the primary molding layer is cooled to room temperature. SBC can be used as the molding material for the secondary molding layer. The secondary molding layer forms the outer surface (outer skin portion) of the model part, but the degree to which the color of the primary molding layer formed on the lower side is transparent differs depending on the thickness of the secondary molding layer. Is formed in.

In the above step, the molding material constituting the primary molding layer is an opaque color (for example, skin color, white, red, other colors such as solid color, metallic color, pearl color, etc.) or translucent (transparent). Has a color (eg, skin color, white, red, or other color). Further, the molding material of the secondary molding layer has a transparent or translucent color. For example, when a model part constitutes a part of a doll's body, the secondary molding layer constituting the surface is clear orange (transparent orange), whereas the primary molding layer is white or flesh-colored. And so on. In this case, by making the secondary molding layer transparent or translucent, it is possible to express the state of wearing clothes that are transparent or have a sense of sheerness on the skin. The color of the secondary molding layer and the color of the primary molding layer may be the same color or similar colors as long as the transparency of the secondary molding layer is formed higher, and the colors are similar or opposite to each other. May be. In the present embodiment, the primary molding layer and the secondary molding layer are formed of different color molding materials in this way, and the secondary molding layer is formed by using a clear material or a translucent material. By doing so, the primary molding layer of different colors underneath can be seen through, thereby enabling gradation expression.

As for the material of the molding material of each molding layer, a material of a common material can be used in order to bond and integrate the primary molding layer and the secondary molding layer with each other. For example, PS, KPS, GPPS, etc. are materials that have the same material as polystyrene, although they have different properties. However, when the melting points of the materials are close to each other, the primary molded layer is eroded by the heat of the secondary molded layer when the secondary molded layer is formed on the primary molded layer and the frictional heat during injection molding. The surface of the molded layer may be roughened. At this time, if the secondary molding layer is opaque, the roughness of the primary molding layer, which is the base layer, cannot be confirmed from the outside, so that there is no particular problem. However, if the secondary molding layer is transparent or translucent, it is passed through the secondary molding layer. Roughness becomes a problem because the surface of the primary molded layer can be seen. On the other hand, when materials of different materials (materials having different materials) are used for the primary molding layer and the secondary molding layer, the bonding force between the layers is weakened, so that the primary molding layer is secondary to the secondary molding layer after molding. There is a problem that the molded layer is easily peeled off.

In this embodiment, the primary molded layer is formed of ABS and the secondary molded layer is formed of SBC of a different material. The melting point of ABS is 100 to 110 degrees, while the melting point of SBC is 80 to 100 degrees. Therefore, even when the primary cambium is formed with ABS in the primary molding step and then the secondary cambium is formed with SBC in the secondary molding step, the primary forming is performed in the secondary molding step due to the difference in melting point. The layer is not eroded. Therefore, the roughness of the primary molded layer is not visually recognized through the secondary molded layer. Further, in the present embodiment, the bonding force between the layers can be maintained by forming the primary molded layer with ABS and then forming the secondary molded layer without cooling to room temperature. The temperature of the primary molding layer at the start of the secondary molding step is a predetermined temperature (for example, 40 to 50 degrees, 30 to 60 degrees, or within the range) higher than the room temperature that can be touched by hand. It may be any range).

The method for manufacturing a model part including the above-mentioned two-step molding step can be carried out by using, for example, a multicolor molding apparatus. In each molding process, a molding die corresponding to the process is used. Specifically, the molded product is taken out from the molding mold after the molding material is poured into the runner groove of the molding mold or the molding space (cavity) for molding each component to form the molded product. The primary molded product produced by the primary molding is attached to the molding die in the molding step of the secondary molding, and the secondary molding is executed. At that time, after the primary molding, the primary molded product is attached to the molding die for the secondary molding step without being cooled to room temperature. Since the molding method itself using the multicolor molding apparatus is known, a more detailed description will be omitted.

Further, in the above, the case where the primary forming layer is formed by performing one forming step has been described, but the primary forming layer is formed according to the thickness of the primary forming layer to be molded and the color of the material. It may be divided and the primary molding may be carried out twice. In this case, the molding process to be carried out is in three stages. By molding the primary molding layer in two steps, it is possible to reduce dents and distortions in molding and to produce a molded product having a uniform appearance.

Next, with reference to FIG. 2, a molding procedure from the primary molding layer to the secondary molding layer will be described according to the molding method of FIG. 1 corresponding to the present embodiment. FIG. 2 is a cross-sectional view of a molding die and a molded product in the molding process. 2 (A) and 2 (B) correspond to the primary molding in S101. As shown in FIG. 2A, the molding die (male mold 201 and female mold 202, male and female mold assignments may be reversed) corresponds to the primary molding layer to be molded. It has a cavity 203, and ABS of a molding material is made to flow into the cavity 203 via a main runner and a sub runner (not shown) in order to form a component.

Then, as shown in FIG. 2B, the molded product 204 is produced in the primary molding using the male mold 201 and the female mold 202. The molded product 204 is composed of a main runner, a sub runner, and a primary molded layer. The molded product 204 is made of ABS. The main runner is formed so as to surround the periphery of the part, and the part is fixed to the main runner by being connected to the main runner via the sub runner. Further, the main runner and the sub-runner correspond to grooves for flowing the molding material into the cavity 203 in the molding dies 201 and 202. In the primary molding of S101, the molding material is flowed from the main runner groove of the molding dies 201 and 202 into the cavity 203 via the sub-runner groove, and the molding material is filled in all of the cavity, the main runner groove and the sub-runner groove. Then, by cooling to a temperature that can be touched by hand (the above-mentioned predetermined temperature), the molded product 204 containing the primary molded layer can be produced.

Next, in the secondary molding of S102, the secondary molding layer is formed so as to cover the upper side of the primary molding layer at a predetermined temperature. 2 (C) and 2 (D) correspond to the secondary molding in S102. As shown in FIG. 2C, a cavity 212 corresponding to the secondary molding layer to be formed in the secondary molding is formed between the molding die 211 and the molded product 204, and the cavity 212 is not formed. The SBC of the molding material is flowed through the main runner and the sub runner shown in the figure. As a result, as shown in FIG. 2 (D), a molded product 213 including the secondary molded layer is formed, and the primary molded layer is at least partially covered with SBC. The molded product 213 is composed of a main runner, a sub runner, and a secondary molded layer. In the present embodiment, the secondary molded layer is formed by forming SBC on the upper surface of the primary molded layer made of ABS from the main runner via the secondary runner. At this time, since the lower side of the primary molded layer is supported by the molding die 202, the molded product 213 is formed so that the thickness of the secondary molded layer becomes a desired thickness without changing the position of the molded product 204. It is possible to form accurately.

In the secondary molding of S102, after the molded product 204 is fixed to the inside of the molding dies 211 and 202, the molding material (SBC) is flowed from the main runner groove to the cavity 213 via the sub-runner groove, and the cavity 213 and the main are main. After filling all of the runner groove and the sub-runner groove with the molding material and then cooling, the molded product 213 can be formed on the upper surface of the molded product 204.

Next, with reference to FIG. 3, an example of the structure of the model parts manufactured according to the manufacturing methods of FIGS. 1 and 2 will be described. FIG. 3A is a diagram showing an example of a model part 300 as a part of a body of a doll toy produced by a molding process corresponding to the present embodiment. The outer surface 302 of the model component 300 is composed of a secondary molding layer, and a part of the primary molding layer 301 covered with the secondary molding layer is exposed to the outside as a connecting portion. The connecting portion functions as a connecting member for connecting to other parts.

FIG. 3B is a separation diagram in which the model component 300 is separated into a plurality of molded layers. FIG. 3B shows a case where the primary molding is performed in two steps. That is, the primary molding layer 301 is composed of the first molding layer 311 and the second molding layer 312, and the secondary molding layer 302 is composed of the third molding layer 313. Although the first molded layer 311 and the second molded layer 312 have different colors from each other, they integrally form a skeleton portion of a model part. Further, the third molded layer 313 forms the outer skin portion of the model part. Hereinafter, for the sake of simplicity, the first molded layer 311 and the second molded layer 312 are collectively referred to as a “skeleton portion”, and the third molded layer 313 is collectively referred to as a “skin portion”.

In the present embodiment, the outer skin portion is formed of a transparent material so as to cover the skeleton portion, and the surface thereof is formed with irregularities. The outer skin portion is a molding layer forming the surface of the model component 200, and has a surface corresponding to a desired outer shape of the model. Since the model part 200 is a part of the body of the doll toy, the unevenness of the body is expressed by the surface shape of the outer skin portion.

Comparing the shapes of the outer surfaces of the skeleton portion and the outer skin portion, it is configured to include a portion that is similar to each other and a portion that is not similar to each other. In the similar figure portion, the thickness of the outer skin portion is maintained at a predetermined value. On the other hand, the non-similar part is formed to have a thickness different from that of the similar part, and the color of the skeleton part that can be visually recognized from the outside through the outer skin part is changed according to the change in thickness. Change. For example, if the outer skin is made of a translucent (for example, clear orange) material and the skeleton is made of a white or flesh-colored material, the white or flesh color of the skeleton may be visible through the clear orange outer skin. On the contrary, the orange will come out strongly.

At this time, since the thickness of the outer skin portion is kept constant in the portion having a similar outer shape, the color tone of the skeleton portion visible through the translucent outer skin portion is constant. However, as the thickness of the outer skin increases, the degree of orange becomes stronger. Further, when the thickness of the outer skin portion becomes thin, the degree of skin color and whiteness becomes deeper. By adjusting the thickness of the exodermis portion in this way, the degree of skin color can be increased, and conversely, the degree of orange can be increased. For example, the convex part of the skeleton should be made thinner to increase the degree of skin color, and the concave part should be made thicker to increase the degree of orange to express the unevenness of the body. Can be done.

Next, the cross-sectional structure of the model component 300 corresponding to the present embodiment will be described. FIG. 4A is a diagram showing an example of how the thickness of the outer skin portion of the model component 300 of FIG. 3A changes. As shown in the cross-sectional view of FIG. 4A, the outer skin portion constituting the outer surface of the model component 300 has thicknesses D1, D2, and D3, and the thickness is increased in the order of D1> D2> D3. In the member of D1, the orange color of the outer skin part becomes darker, but as the outer skin part becomes thinner like D2 and D3, the degree of orange color becomes weaker, and instead the degree of skin color of the skeleton part becomes darker. It's getting stronger. The thicker the portion, the greater the degree of color mixing of the outer skin portion with respect to the color of the skeleton portion, and the greater the change in hue when the model component 300 is viewed from the outside.

By partially or wholly changing the thickness of the outer skin portion in this way, it is possible to make the color tone of the model part 300 different when viewed from the outside. At this time, in the portion where the thickness of the outer skin portion is continuously thickened, the degree of color mixing of the outer skin portion with respect to the color of the skeleton portion gradually increases, so that the darkest color of the skeleton portion can be seen through. Since the color gradually fades and changes to the color of the outer skin itself, the observer can observe the gradation on the surface of the model component 300.

The appearance of the gradation can be different depending on how the thickness of the outer skin is changed. For example, different gradation expressions can be realized because the method of changing from a dark color to a light color differs depending on whether the degree of change in thickness is steep or gradual. Further, the thickness may be changed in the direction of reducing the thickness. This also makes it possible to change from a light color to a dark color.

In FIG. 4A, an example of realizing a gradation expression by changing the thickness of the outer skin portion has been described, but the present invention is not limited to the above embodiment, and for example, the thickness of the outer skin portion is constant. You may. FIG. 4B is a diagram showing an example of the case where the thickness of the outer skin portion is uniform among the model parts 300 of FIG. 3A. As shown in the cross-sectional view of FIG. 4B, the thickness of the outer skin portion constituting the outer surface of the model component 300 is uniform.

In the above, the case where the primary molded layer is formed of ABS and the secondary molded layer is formed of SBC has been described, but the combination of materials is not limited to this, for example, the primary molded layer. The ABS and the secondary molding layer may be formed of TPE (Thermoplastic elastomer: thermoplastic elastomer, particularly styrene-based thermoplastic elastomer). Further, the primary molded layer may be formed of KPS (reinforced polystyrene) and the secondary molded layer may be formed of TPE. In addition, the primary molding layer can be formed by using a first material having a higher melting point, and the secondary molding layer can be formed by using a second material having a lower melting point.

As described above, according to the present embodiment, it is possible to provide a model part having a stable quality base layer visible from the outside and a method for manufacturing the same.

The invention of model parts
With the first layer formed of the first material of the first color,
It has a second layer formed so as to cover at least a part of the first layer, and has a second layer made of a second material of a second color.
The melting point of the first material is higher than the melting point of the second material.
The first layer is visible from the outside through the second layer.
In addition, the invention of model parts
With the first layer formed of the first material of the first color,
It has a second layer formed so as to cover at least a part of the first layer, and has a second layer made of a second material of a second color.
The melting point of the first material is higher than the melting point of the second material.
The first layer is visible from the outside through the second layer.
The first material is an acrylonitrile butadiene styrene (ABS) resin, the second material is a styrene butadiene copolymer (SBC) resin, or the first material is an acrylonitrile butadiene styrene (Acrylonitrile butadiene styrene (SBC) resin). ABS) resin, the second material being a thermoplastic elastomer (TPE) resin, or the first material being a reinforced polystyrene (KPS) resin, the second material being a thermoplastic elastomer (TPE) resin. TPE) Resin.

The invention of the manufacturing method of model parts
The first step of forming the first layer using the first material of the first color, and
A second step of forming the second layer using the second material of the second color so as to cover at least a part of the first layer.
Including
In the second step, the second layer is molded before the first layer is cooled to room temperature.
The melting point of the first material is higher than the melting point of the second material.
The first layer is visible from the outside through the second layer.
In addition, the invention of the manufacturing method of model parts
The first step of forming the first layer using the first material of the first color, and
A second step of molding the second layer with a second material of the second color so as to cover at least a portion of the first layer.
In the second step, the second layer is molded before the first layer is cooled to room temperature.
The melting point of the first material is higher than the melting point of the second material.
The first layer is visible from the outside through the second layer.
The first material is an acrylonitrile butadiene styrene (ABS) resin, the second material is a styrene butadiene copolymer (SBC) resin, or the first material is an acrylonitrile butadiene styrene (Acrylonitrile butadiene styrene (SBC) resin). ABS) resin, the second material being a thermoplastic elastomer (TPE) resin, or the first material being a reinforced polystyrene (KPS) resin, the second material being a thermoplastic elastomer (TPE) resin. TPE) Resin.

Claims (9)

With the first layer formed of the first material of the first color,
It has a second layer formed so as to cover at least a part of the first layer, and has a second layer made of a second material of a second color.
The melting point of the first material is higher than the melting point of the second material.
The first layer is a model part that is visible from the outside through the second layer. The model component according to claim 1, wherein the second layer includes portions having different thicknesses. The model component according to claim 1 or 2, wherein the transparency of the first color is lower than the transparency of the second color. The model component according to claim 3, wherein the second color is translucent. The model component according to claim 3, wherein the first color is opaque and the second color is translucent. The model component according to claim 3, wherein the first color is translucent and the second color is translucent. The first material is an acrylonitrile butadiene styrene (ABS) resin, and the second material is a styrene butadiene copolymer (SBC) resin, according to any one of claims 1 to 6. Model parts. It is a manufacturing method of model parts.
The first step of forming the first layer using the first material of the first color, and
A second step of forming the second layer using the second material of the second color so as to cover at least a part of the first layer.
Including
In the second step, the second layer is molded before the first layer is cooled to room temperature.
The melting point of the first material is higher than the melting point of the second material.
The first layer is visible from the outside through the second layer.
How to manufacture model parts. The method for manufacturing a model part according to claim 8, wherein the first material is an acrylonitrile butadiene styrene (ABS) resin, and the second material is a styrene butadiene copolymer (SBC) resin.

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