JPH07276429A - Manufacture of resin molded piece - Google Patents

Abstract

PURPOSE:To make an ink applying work easy and eliminate a printing process by a manufacturing method wherein a predetermined part of a movable formwork or a fixed formwork is coated with an ink of a pattern design, the movable formwork closed, a melted resin material is put with pressure in a cavity, and the applied pattern design ink is transferred to a resin molded piece and cured. CONSTITUTION:A male formwork 14 at the movable side is opened for a female formwork 12 at the fixed side of a formwork device 10, a part 14b of the male formwork 14 corresponding to a pattern forming part (a) to be formed on a resin molded piece A is coated with a pattern design 16 by an oil ink having affinity with a resin material. In this case, an ink applying mechanism 18 is arranged movably in between the male formwork 14 and the female formwork 12 so as to apply the oil ink to the part 14b of the male formwork 14. Next, mold clamping is performed and the melted resin material is injected into a cavity 20 so as to mold the resin molded piece A. At this time, the green pattern design 16 applied to the part 14b is directly attached and connected (transferred) to the pattern forming part (a), cooled, and cured.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a resin molded product, and more particularly to a method for manufacturing a resin molded product having a surface provided with a pattern including letters and the like.

[0002]

2. Description of the Related Art Conventionally, when manufacturing a resin molded product having a design including letters or the like on its surface, for example, plastic molding is used between molds of a molding apparatus and it is required in advance. A method of sandwiching a film printed with a design etc. and transferring only the design etc. of the film at the same time as molding, or integrally welding the film, or a method of printing the design at a predetermined position of the resin molded product after molding It is widely adopted and is provided for the convenience of consumers.

By the way, in the case of transferring only a design or the like to the above-mentioned molded product, in the case of transferring a plurality of designs due to heat shrinkage of the film, not only the alignment is complicated but also a dimensional error easily occurs, and the film When the molded product is transparent as it is, it is pointed out that the edge part of the film is conspicuous due to the condition of the light rays and the quality of the product is impaired, and the resin molded product after molding has a pattern. In the method of printing, it is necessary to add a printing process, and there is a problem in terms of durability of printed patterns.

[0004]

Therefore, in the present invention, when manufacturing a resin molded product, first, a movable mold is opened with respect to a fixed-side mold, and a pattern portion to be applied to the resin molded product molded by these mold devices and A pattern ink is applied to a predetermined position of the corresponding movable mold or fixed mold, and then the movable mold is closed to press the molten resin material into the cavity formed in the mold device and move the mold. By transferring the pattern ink applied to the frame or fixed side mold to the surface of the resin molded product and curing it, it is easy to form a durable pattern and even if the resin molded product is transparent, it gives a high-class feeling. It is intended to provide a manufacturing method that can be held.

In this case, if a male mold is used as a mold for applying the ink of the design pattern, the ink applying work can be carried out easily, and therefore the resin molded product can be efficiently formed. You can

[0006]

In the method of manufacturing a resin molded product according to the present invention, when the molten resin raw material pressed into the cavity formed in the mold device is molded as a resin molded product, the movable mold or the movable mold is formed on the surface of the resin molded product. The ink of the design pattern applied to a predetermined portion of the fixed-side mold is transferred.

[0007]

The preferred embodiments of the method for producing a resin molded product according to the present invention will be described in detail below with reference to the accompanying drawings.

Referring to FIG. 1, in the method for manufacturing a resin molded product according to the present invention, first, the male mold 14 on the moving side is opened with respect to the female mold 12 which is the fixed side of the mold frame device 10, and as will be described later. A resin molded product A molded by this mold device 10
The pattern 16 is applied to the portion 14b of the male mold frame 14 corresponding to the pattern forming portion a to be applied to the above, using an oil-based ink having an affinity with the resin material.

In this case, as means for applying the oil-based ink to the portion 14b of the male mold 14, the opened male mold 1 is used.
4 and the female mold 12, which is the fixed side, between the ink applying mechanism 1
8 may be movably arranged, and the oil-based ink may be applied to the location 14b of the male mold 14 at a predetermined timing.

As for the constitution of the ink applying mechanism 18 itself, for example, a soft absorbent material is impregnated with an oil-based ink, and the oil-based ink is exuded during the applying operation to the portion 14b. It is preferably used because it has a simple structure and handling, but it goes without saying that an appropriate coating mechanism other than this type can also be used.

Location 1 of male mold 14 using oil-based ink
When the application of the design pattern to 4b is completed, the male mold frame 14 is moved again and the mold is closed.
For example, an injection pressure of 300kg / cm ² ~400kg / cm ² about the cavity 20 formed by the molten resin material to about 190 degrees to 210 degrees Celsius and the female mold 12 and the male mold 14 (injection) Then, the resin molded product A is molded.
At this time, the oil-based ink (design pattern 16) in a dry state applied to the portion 14b of the male mold 14 is the design of the molded product A (high temperature state of about 150 to 180 degrees Celsius) during the molding process. It is directly adhesively bonded (transferred) to the formation location a.

When the injection of the molten resin material into the cavity 20 is completed, it is cured using forced cooling, natural cooling or a known cooling method that uses these in combination, and then the male frame 14 is opened and the resin molded product is opened. You can take it out as A. The pattern 16 is clearly transferred (formed) to the portion a of the obtained resin molded product A, and since this pattern does not use a film or the like, this pattern portion is temporarily made of a transparent material. Can be taken out as an extremely high-quality resin molded product A without impairing the feeling of luxury.

[0013]

As described above, according to the method of manufacturing a resin molded product according to the present invention, when the molten resin material is press-fitted into the cavity of the mold device to mold the resin molded product, the resin molded product is molded. Since the ink of the design pattern applied to the predetermined position of the movable mold or the fixed side mold is transferred to the surface of the product, it is easy to display the design pattern and has high durability, and even if the material of the molded product is transparent. Since no film is used, no shadows such as edges appear and the product can retain a high-class feeling.

Further, since the male mold is used as the mold for applying the ink of the design pattern, the ink applying work can be carried out easily and easily, so that the resin molded product can be efficiently formed. . Further, since the molding of the product and the transfer of the design and the like can be performed at the same time, there are various advantages such that the printing process can be omitted and the efficiency of the molding operation can be improved.

Although the preferred embodiment of the method for producing a resin molded product according to the present invention has been described above, the present invention is not limited to this embodiment, and for example, heat resistance can be applied to a predetermined portion of the male mold. It is possible to make various changes within the scope not departing from the spirit of the present invention, such as providing an ink-applying portion of an ink pad type having a structure such that the oil-based ink seeps out from the ink-applying portion at a predetermined timing. Of course.

[Brief description of drawings]

FIG. 1 is a procedure explanatory view of a preferred embodiment of the method for producing a resin molded product according to the present invention.

FIG. 2 is a partially omitted perspective view of an embodiment of a mold frame device used in the method for manufacturing the resin molded product shown in FIG.

[Explanation of symbols]

10 Formwork device, 12 Female formwork, 1
4 male form, 16 pattern, 18 ink application mechanism, 20 cavities, A resin molded product,

Claims (2)

[Claims] 1. When manufacturing a resin molded product, first, a movable mold is opened with respect to a fixed-side mold, and a movable mold corresponding to a pattern portion applied to the resin molded product molded by these mold devices or Ink of a pattern is applied to a predetermined portion of the fixed-side mold, and then the movable mold is closed to press the molten resin material into a cavity formed in the mold device, and the movable mold or the fixed-side mold. A method for producing a resin molded product, which comprises transferring the pattern pattern ink applied to the surface of the resin molded product and curing the ink. 2. The method for producing a resin molded product according to claim 1, wherein the mold to which the pattern pattern ink is applied is a male mold.