JPH07304062A - Emboss forming of method of two-color molded product - Google Patents

Abstract

PURPOSE:To enable surface treatment imparting taste wherein non-glossy parts and glossy parts are mixed to the surface of a molded product and to provide roundness to the corners of embossed parts to make a contaminant easy to remove by pressing a primary molded product to the embossing unevenness of a secondary mold. CONSTITUTION:In a method for forming embossed patterns to a two-color molded product molded by laminating thermosetting resin layers having different colors, at first, a primary molded product 2 is molded in a primary mold 1 in a reduced curing degree. Next, the primary molded product 2 is fitted in a secondary mold 3 having embossing unevenness 3b formed on the molding surface thereof so as to come into contact with the embossing unevenness 3b to be subjected to secondary molding. The embossing unevenness 3b is pressed to the surface of the primary molded product 2 to form embossed patterns. Since the embossed patterns are formed by pressing the secondary mold 3 to the primary molded product 2, the molded product is easily demolded and, since the embossed patterns are formed by pressing the protruding parts of the embossing unevenness 3b, roundness can be applied to the corners of the embossed patterns.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a grain forming method for a two-color molded product obtained by laminating two layers of thermosetting resins having different colors.

[0002]

2. Description of the Related Art Conventionally, in order to form a grain on a two-color molded product obtained by laminating two layers of thermosetting resins having different colors, a grain-forming irregularity is formed on the mold surface on the side where the grain is to be inserted. Using the primary molding die, the wrinkles were formed during the primary molding. And, the unevenness for grain forming was not formed on the die surface of the secondary forming die to be formed later. In addition, since the unevenness for embossing of the primary molding die is formed by etching the mold surface, it is not possible to leave an unetched portion on the unevenness for embossing. Therefore, the surface of the textured part of the molded product was dull.

[0003]

As described above, since the surface of the textured portion of the product molded by the conventional textured molding method has a matte surface, there is a problem that the surface treatment cannot be performed tastefully. there were.

Further, if the grain is formed on the rising surface which is almost parallel to the die moving direction, the grain cannot prevent the product from coming off from the die. Therefore, there is a problem that it is difficult to freely insert a grain.

Further, when a grain is formed on a product, stains enter into the grain portion, and it is difficult to remove the stain even if it is washed, so that it is apt to become unclean and is not suitable for tableware.

It is an object of the present invention to provide a grain forming method for a two-color molded product that solves the above problems.

[0007]

Therefore, in the texture forming method of the present invention, the primary molded product 2 is molded in the primary molding die 1 with a low degree of curing, and then the grain surface is textured. The secondary molding die 3 having the projections and depressions 3b formed therein is loaded with the primary molded product 2 so as to abut against the embossed projections and depressions 3b for secondary molding, and the surface on the side of the primary molded article 2 has the textured projections and depressions. 3b was pressed to form wrinkles.

[0008]

The texture is formed by pressing the primary molded product 2 against the texture-forming irregularities 3b during the secondary molding. At this time, only the convex portions of the unevenness-forming irregularities 3b bite into the surface of the primary molded product 2, so that the portions not hit by the convex portions remain in the state of the primary molding. Therefore, on the surface of the molded product, the portion where the convex portion hits is matte, but the portion where the convex portion does not hit remains glossy. Therefore, the surface of the molded product is a surface treatment in which a matte portion and a glossy portion are mixed.

Furthermore, since the texture is formed by pressing in the secondary molding die 3 in the pressing direction (clamping direction), the molded product is easily released from the mold.

Furthermore, since the wrinkles are formed by pressing the protrusions of the wrinkle forming unevenness 3b by pressing, the corners of the wrinkles can be rounded.

[0011]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is an explanatory view showing a manufacturing process of a two-color molded product using a thermosetting resin. A thermosetting resin such as a phenol resin or a melamine resin is used as the resin used for molding.

Reference numeral 1 denotes a primary molding die. A thermosetting resin P is put into the primary molding die 1 for primary molding, and an outer shell 2 is molded. At this time, the degree of curing of the outer shell 2 is reduced.

Reference numeral 3 is a secondary molding die. The surface 3a of the cavity 3a of the secondary molding die 3 is provided with the unevenness 3b for embossing. The texture-forming irregularities 3b are formed by etching similarly to the conventional mold.

An outer shell 2 molded by primary molding is loaded so as to hit the cavity side 3a of the secondary molding die 3. Then, thermosetting resins P having different colors are put between the outer shell 2 and the core 3c to carry out secondary molding. When secondary molding is performed, the outer shell 2 is pressed against the unevenness 3b for the embossing by the movement of the cavity 3a of the secondary molding die 3, and the convex portion of the unevenness 3b for the embossing molding bites the outer shell 2 on the surface of the outer shell 2. Is formed.
In addition, 4 is a secondary molding part molded by secondary molding.

FIG. 2 is an explanatory view showing, in an enlarged manner, how the grain is formed on the bottom surface of the outer shell 2. As shown in the figure, when the outer shell 2 is pressed against the embossing 3b for embossing, the protrusions 3d of the embossing 3b for embossing cut into the surface of the outer shell 2,
The portion of the recess 3e does not contact the outer shell 2. Therefore, on the surface of the molded product, the portion corresponding to the convex portion 3d becomes matte and the portion corresponding to the concave portion 3e not hit by the convex portion 3d remains glossy. Therefore, the surface of the molded product is a surface treatment in which a matte portion and a glossy portion are mixed.

FIG. 3 is an explanatory view showing, in an enlarged manner, how the wrinkles are formed on the rising surface of the outer shell 2. As shown in the figure, when the outer shell 2 is pressed against the embossed unevenness 3b,
The convex portion 3d of the unevenness 3b for grain forming bites into the surface of the outer shell 2, but since it is the biting in the pressing direction (mold clamping direction),
The molded product is easily released from the mold as shown in FIG.

When the product molded as described above is taken out, a two-color molded product having a tasteful surface treatment in which a matte portion and a glossy portion are mixed is completed. Since this embossing is formed by pressing with pressure, the corners of the embossing are rounded and the edge 2a becomes a dent.

The embodiment has been described above, and the example in which the outer surface of the outer core is provided with the embossment has been described. However, the following method can form the embossment on the inner surface of the inner core.

The primary molding die is used to mold the inner core while reducing the degree of curing. Uneven molding unevenness is formed on the core-side mold surface of the secondary molding mold.

The inner surface of the inner core is loaded into the secondary molding die so as to come into contact with the textured irregularities, and a thermosetting resin having a different color is put between the inner core and the cavity for secondary molding.

When the product molded as described above is taken out, a two-color molded product in which a grain is formed on the inner surface of the inner core is completed.

As described above, the texture can be formed on the inner surface and the outer surface of the two-color molded product by the method of the present invention.

[0024]

Since the grain forming method of the present invention is as described above, it has the following effects.

According to the present invention, the primary molded product is pressed against the unevenness for forming the texture of the secondary molding die to form the texture, and the surface of the molded product is the portion where the convex portion hits. Becomes matte, and the part where the convex part does not hit remains glossy. Therefore, the surface of the molded product is a surface treatment in which a matte portion and a glossy portion are mixed.

Furthermore, the texture is formed by pressing the texture-forming irregularities in the pressing direction (mold clamping direction) of the secondary molding die, and the texture can be formed on any surface. The product does not get stuck in the mold. for that reason,
It is possible to form a wrinkle on the rising surface, which has been impossible in the past.

Further, since the wrinkles are formed by pressing the unevenness for forming the wrinkles, and the corners of the wrinkles are rounded, dirt can be easily removed and the wrinkles can be cleaned. Therefore, the formed product is suitable as tableware.

[Brief description of drawings]

FIG. 1 is an explanatory view showing a manufacturing process of a two-color molded product by a grain forming method of the present invention.

FIG. 2 is an explanatory view showing a state in which a grain is formed on a bottom surface portion of an outer shell.

FIG. 3 is an explanatory view showing a state in which a grain is formed on a rising surface portion of an outer shell.

FIG. 4 is an explanatory view showing a state in which a rising surface portion of an outer member is released.

[Explanation of symbols]

 1 die for primary molding 2 outer shell 3 die for secondary molding 3b unevenness for embossing

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Claims (1)

[Claims] 1. A method for forming a grain in a two-color molded product obtained by laminating two layers of thermosetting resins of different colors, which comprises first molding a primary molded product (2) with a primary molding die (1). The primary molding product (2) is molded into a mold (3b) having the unevenness (3b) for embossing formed on the mold surface with a reduced degree of hardening, and then the unevenness (3b) for embossing ), The secondary molding is performed, and the unevenness (3b) for the embossing is pressed against the surface of the primary molded product (2) side to form the embossed product. Texture formation method.