JPH0457172B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a coloring device for a molded product that colors at least a portion of the surface of a molded product made of resin, rubber, or the like.

(Prior art) Conventionally, for example, in molded products such as the Matsudo Guard described in Japanese Utility Model Application Publication No. 57-77088, which has letters, etc. colored with paint or resin of different colors drawn on the surface. However, when coloring the character portion, there was no apparatus that could mold and color the molded product almost simultaneously.

Therefore, coloring of molded products is done in a separate process after the molded product is molded.In particular, when coloring a part of the molded product, the parts other than the colored surfaces are masked and then painted manually. It was colored with etc.

(Problems to be Solved by the Invention) In the prior art as described above, the molded product is colored in a separate process after it is molded, so there are problems in that the manufacturing time and effort are increased, and there is also a problem in that productivity is poor. In particular, when masking is required, it takes more time and effort.

(Means for Solving the Problems) The present invention has been made for the purpose of solving the above-mentioned problems, and in order to achieve this purpose, the molded product coloring device of the present invention includes the following steps: The core mold and the cavity mold are clamped by moving toward and away from each other.
The core mold and the cavity mold are arranged so that they can be opened, and a core side molding surface and a cavity side molding surface are respectively formed on opposing surfaces of the core mold and the cavity mold, and when the mold is clamped, the core side molding surface and the cavity side A product molding section is formed between the molding surface, and a base material gate into which a fluidized resin or rubber base material is injected is opened in the product molding section, and the core side molding surface and the cavity side A colored part is formed on one or both of the molding surfaces and forms a colored surface of the molded product, and the surface of the colored part is formed so that it can elastically invade into the mold. The method is characterized in that the coloring material gate connected to the coloring material injection device is opened. Note that the above-mentioned coloring material refers not only to paint but also to general materials for coloring, such as a resin whose color is different from that of the base material.

(Function) In the molded product coloring apparatus of the present invention, molding and coloring are performed in the following steps.

First, the core mold and the cavity mold are clamped, and a base material such as resin is injected through the base material gate.
Thereby, the base member is filled in close contact with the molding surfaces of both molds including the colored portions.

Next, while the base material is curing, a coloring material such as paint or resin is injected between the colored surface of the molded product and the colored portion of the mold through the coloring material gate. Note that the injection pressure at this time is higher than the pressure when injecting the base material. Then, since the surface of the colored part is formed so that it can elastically invaginate against the mold, the surface of the colored part invaginates due to the injection pressure of the coloring material, and the surface of the colored part and the to-be-colored part are separated. A gap is created between the surface and the coloring material is injected into this gap.

After the base member and coloring material have hardened, the mold is opened and the molded product is taken out, completing the molding and coloring.

In addition, the above-mentioned elastic invagination of the surface of the colored part means that the colored part itself is formed of an elastic body, or the surface part of the colored part is supported by an elastic body, and the deformation of these elastic bodies causes This means that the surface of the colored part invaginates into the inside of the mold.

Therefore, in the present invention, it is possible to color the molded product almost simultaneously with molding in the molding process without having to do it manually, so it is possible to shorten the working time and reduce the labor involved in the work.

In addition, the injection pressure of the coloring material causes the surface of the colored part to cave in, creating a gap for the coloring material, which eliminates the need for masking, which also saves time and effort. Compared to the case of mechanically invaginating, the structure can be extremely simplified, and as a result, it is easy to incorporate and attach to the core and cavity mold, and is highly versatile.

(Example) Hereinafter, an example of the present invention will be described in detail with reference to the drawings.
In describing this embodiment, an apparatus for molding and coloring an automobile floor mat M will be taken as an example. This floor mat is made of black thermoplastic resin P.
As shown in FIG. 3, a character portion 1 is provided on the surface thereof in a protruding manner, and a colored surface 2 to be colored white is provided on the surface of this character portion 1.

First, the configuration of the first embodiment will be explained.

As shown in FIG. 1, the surface coloring device A for molded products of the first embodiment includes a core mold 10, a cavity mold 20,
Resin injection device 30, paint injection device 4
0 is the main configuration.

As shown in the figure, the core mold 10 and the cavity mold 20 are provided with a core side molding surface 11 and a cavity side molding surface 21 that form a product molding part 101 when both molds (hereinafter referred to as mold 100) are in a clamped state. .

Further, a resin injection device 30 is connected to the cavity mold 20 so that the thermoplastic resin P, which is the material of the floor mat M, can be injected into the product molding section 101 from the base material gate 22. A character recess 23 for molding the character part 1 of the floor mat M is provided on the cabinet side molding surface 21, and a colored surface 51 facing this character recess 23 is provided.
An insert mold 50 as a colored portion is provided.

The insert mold 50 is made of fluororesin and is elastically deformable, and a coloring material gate 52 is opened in the center of the colored surface 51.

This coloring material gate 52, as shown in the figure,
Paint flow path 41, metering pump 42, drive cylinder 43, switching valve 44, high pressure pump 45,
It is connected to a paint injection device 40 consisting of a paint tank 46 and a one-way valve 47 so as to be able to supply paint F, and
As shown in FIG. 2, it is opened and closed by a gate valve 53 slidably provided within the insert mold 50.

Note that the paint injection pressure of the paint injection device 40 is set higher than the resin injection pressure of the resin injection device 30. Furthermore, the paint F used has a much shorter curing time than the thermoplastic resin P.

Next, the operation of the embodiment will be explained.

First, the mold 100 is clamped, and the product molding section 101 is
A thermoplastic resin P in a plastic (fluid) state is injected and filled into the inside. The thermoplastic resin P filled in this state is closely packed into both molding surfaces 11 and 21.

Next, while the filled thermoplastic resin P is curing, the gate valve 53 is opened and the coloring material gate 5 is opened.
From step 2, inject paint F.

Then, as shown in FIG. 2, due to the injection pressure of this paint F, the colored surface 5 is in close contact.
1 and the thermoplastic resin P corresponding to the colored surface 2 of the floor mat M during curing is elastically deformed, and the colored surface 5
A minute gap is created between the surface 1 and the surface to be colored 2, and the paint F flows into this gap and fills it.

After the thermoplastic resin P and paint F have hardened, the mold 100 is opened and the molded floor mat M is released.

In addition, since the insert mold 50 is made of fluororesin, the mold releasability of the thermoplastic resin P is very good and no external mold release material or the like is required.

In this way, in the surface coloring device A of this embodiment,
The hardening described below is obtained.

Since the coloring of the character part 1 is completed at the same time as the molding of the floor mat M is completed, it is possible to shorten the working time and reduce the labor involved in coloring including masking.

Further, when injecting the paint F, separating the colored surface 2 of the floor mat M and the colored surface 51 of the insert mold 50 is performed by elastic deformation of the insert mold 50 due to paint injection pressure, rather than by mechanical operation. As a result, the structure is extremely simple, and it is also extremely easy to incorporate and attach to existing molds.

Furthermore, since the insert mold 50 is made of fluororesin, the thermoplastic resin P has good mold releasability and does not require an external mold release material.

Next, a second embodiment, the main part of which is shown in FIG. 4, will be described.

In this embodiment, the colored surface 251 of the colored portion 250
is formed of a hard member 200 such as iron, and this member 200 is elastically supported by a coil sprig 201.

Further, the coloring material gate 252 is not provided with a gate valve. That is, the coloring material gate 25
If the diameter of 2 is small to some extent (for example, 30μ or less)
If so, a gate valve is not necessary because backflow can be prevented by the surface tension of the thermoplastic resin P as the base material.

Therefore, with the injection pressure of paint F, the coil sprick 20
1 shrinks and becomes colored, a gap is created between the surface 251 and the thermoplastic resin P, and the paint F is injected between the two.

Note that the other configurations, functions, and effects are the same as those in the first embodiment, so explanations thereof will be omitted.

Although the embodiments of the present invention have been described above in detail with reference to the drawings, the specific configuration is not limited to these embodiments. For example, in the embodiments, an example was shown in which paint was used as the coloring material, but Other coloring materials such as resin or rubber that are different in color from the material forming the base of the molded article may also be used.

Further, in the embodiment, a floor mat is shown as a molded product, but the present invention is not limited to this, and as the material, thermosetting resin, rubber, etc. can be used in addition to thermoplastic resin.

Further, in the embodiment, an example was shown in which the molded product was molded by injection molding, but it may be molded by other means such as compression molding.

Further, in the embodiment, an example in which a part of the molded product is colored is shown, but it can also be applied to a case where the entire surface of the molded product is colored, and the same effects can be obtained in that case as well.

(Effects of the Invention) As explained above, in the surface coloring device for molded products of the present invention, the surface of the colored portion is formed so as to be elastically invaginated with respect to the mold, and the surface of the colored portion is formed so as to be elastically invaginated with respect to the mold. Since the gate is open, it is possible to shorten the working time and reduce the labor involved.In addition, the surface of the colored part is mechanically indented by an actuator, etc. The structure can be extremely simplified compared to the case where
As a result, it is easy to incorporate and attach to the core and cavity molds, and it is highly versatile.

[Brief explanation of the drawing]

Fig. 1 is an overall view showing a surface coloring device for molded products according to the first embodiment of the present invention, Fig. 2 is a sectional view showing the main parts of the device of the first embodiment, and Fig. 3 is a molded product using the device of the embodiment. FIG. 4 is a sectional view showing essential parts of the device of the second embodiment. M...floor mat (moulded product), P...thermoplastic resin (base material), F...paint (coloring material), 2
... Surface to be colored, 10 ... Core mold, 11 ... Core side molding surface, 20 ... Cavity mold, 21 ... Cavity side molding surface, 22 ... Gate for base material, 40 ... Paint (coloring material) Injection device, 50... Insert mold (colored part), 52... Colored surface, 101... Product molding part, 250... Colored part, 251... Colored surface, 2
52...Gate for coloring material.

Claims (1)

[Scope of Claims] 1. A core mold and a cavity mold are arranged so that they can be clamped and opened by moving toward and away from each other, and the opposing surfaces of the core mold and the cavity mold have a core side molding surface and a cavity molding surface, respectively. A side molding surface is formed, and a product molding part is formed between the core side molding surface and the shell side molding surface at the time of mold clamping, and the product molding part is filled with fluidized resin or rubber. A base material gate for injecting the base material is opened, and a colored part for forming a colored surface of the molded product is formed on at least one of the core-side molding surface and the shell-side molding surface, and the surface of the colored part 1. A device for coloring a surface of a molded product, characterized in that a colorant gate is formed so as to be elastically invaginable into a mold, and a colorant gate communicating with a colorant injection device is opened.