JPH1086185A - Mold for molding plastic - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a decorative film over both sides of a parting line of a mold at an injection molding by improving the mold for injection molding continued to vacuum molding of the film. SOLUTION: The mold 10 comprises relatively movable first mold plate 11 and second mold plate 12, and a moving plate 13 provided between the plates 11 and 12 in such a manner that they can be positioned at a vacuum molding position for integrating the plate 11 with the plate 13 to separate it from the plate 12, an injection molding position for clamping the plates 11, 12 via the plates 13, and a mold opening position for separating the plate 11 from the plate 13 and slightly separating the plate 13 from the plate 12. Cavities are formed at the plates 11 and 13, and mating surfaces of the plates 11 and 13 are set as parting lines at the time of opening the molds after injection molding.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mold for producing a plastic molded product having a decorative film on its surface, and more particularly, to a vacuum film forming process for a decorative film and an injection molding process for a plastic material in a continuous manner. The present invention relates to a mold for plastic molding that can be performed.

[0002]

2. Description of the Related Art Conventionally, woodgrain panels are sometimes attached to interior parts of automobiles for the purpose of decoration. In FIG. 5, a wood grain panel 50 is generally a plastic molded product, and a decorative film 51 having a wood grain pattern is provided on a surface of a panel main body 52. This wood grain panel 50
For example, there is a method of vacuum-molding a wood-grained decorative film 51, trimming unnecessary portions, and insert-molding the trimmed film so as to conform to the surface shape of the woodgrain panel 50, or a wood-grained decorative film. After vacuum-molding (FIG. 6) the first mold plate 60 and the second mold plate 61 using a first mold plate 60 of a mold, injection molding (FIG. 7) is performed by molding, and after molding, the film 51 is formed. Is formed by, for example, a method of trimming unnecessary portions. The latter method is more efficient than the former method because the steps of vacuum molding and injection molding can be performed continuously.

However, if this method is used, the decorative sheet 51 can be provided only up to the parting line of the mold in the molded product 50. Therefore, in the case of a wood grain panel as shown in FIG. After mounting on a board or the like, when viewed from the side, a portion without a wood grain sheet was sometimes seen.

[0004]

SUMMARY OF THE INVENTION Accordingly, the technical problem to be solved by the present invention is to improve a plastic molding die capable of performing injection molding following vacuum molding of a decorative film and to inject the decorative film. An object of the present invention is to allow the molded product to be provided on both sides of a parting line of a mold.

[0005]

Means for Solving the Problems A plastic molding die according to the present invention has the following features in order to solve the above-mentioned technical problems. In other words, the mold has a relatively movable first mold plate and a second mold plate.
A vacuum forming position comprising a template and a movable plate provided between the two templates, wherein the first and second templates and the movable plate are integrated with the first template and the movable plate and separated from the second template; And an injection molding position for clamping the first template and the second template with the movable plate therebetween, and a mold opening for separating the movable plate from the first template and slightly separating the movable plate and the second template. The position and the position can be set.

In this mold, a cavity is formed in a first mold plate and a movable plate, and a mating surface between the first mold plate and the movable plate is set as a parting line when the mold is opened after injection molding. Further, the moving plate has a film holder on the mating surface with the second template to hold an edge of the decorative film around the cavity when the moving plate is in the vacuum forming position. The first template has a film suction port communicating with the cavity, and the second template has a molded product extruding mechanism for separating the molded product from the cavity. In addition, any film other than a wood grain film can be used as a decorative film.

[0007]

In the above configuration, first, the first mold plate and the moving plate are set at the vacuum forming position, the decorative film is held by the film holder, and the film heating means generally used at the time of vacuum forming is used. The film is deformed into a shape along the cavity by sucking air from the suction port while heating the film. Next, the film retainer is removed while the decorative film remains in the cavity, and the first and second template plates are clamped with a movable plate therebetween to perform injection molding. When the injection molding is completed and the plastic material is solidified, the first mold plate and the moving plate are separated from each other, and the moving plate is slightly separated from the second template to leave the edge of the decorative film free. The molded product is taken out of the cavity by the molded product extrusion mechanism. At this time, the peripheral portion of the decorative film extends outside the cavity, but since the film material is flexible, the decorative film is pulled out through the cavity while being attached to the molded product. Thereafter, unnecessary parts of the decorative film are trimmed to complete the molded product.

As described above, in the above configuration, the parting line between the first template and the movable plate is used as a parting line when the mold is opened, and the first template and the movable plate are integrated during vacuum forming of the decorative film. Since the decorative film extends along the entire cavity, the molded article is almost entirely covered with the decorative film. Therefore, even when a wood grain panel formed using a wood grain film as a decorative film is mounted on a dashboard or the like, it is possible to prevent a portion without a wood grain sheet from being seen even when viewed from the side.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a plastic molding die according to the present invention will be described below in detail with reference to FIGS. 1 to 3 are sectional views showing a schematic structure and an operation state of the mold 10, FIG. 1 shows a vacuum molding state, FIG. 2 shows an injection molding state, and FIG. 3 shows a mold open state after the injection molding. I have.

In FIG. 1, reference numerals 11 and 12 denote a first template and a second template which are relatively movable, and reference numeral 13 denotes a movable plate provided between the two templates 11 and 12. First
The template 11 is fixed in position, and the second template 12 and the movable plate 13 move with respect to the first template 11. Two guide rods 14 are fixed to the first template 11, and the guide rod 1 is fixed to the second template 12 and the movable plate 13.
4 and guide holes 12a, 1 that can slide.
3a are formed. The second template 12 and the movable plate 1
3 can be driven using an actuator such as a hydraulic cylinder (not shown), for example.

At the vacuum molding position shown in FIG. 1, the first mold plate 11 and the movable plate 13 are integrated and separated from the second mold plate 12, and at the injection molding position shown in FIG. The second plate 12 is fastened with the movable plate 13 interposed therebetween. In the mold opening position shown in FIG.
And the moving plate 13 and the second template 12 are slightly separated.

In this mold 10, the cavity 15
Is formed over the first mold plate 11 and the movable plate 13, and the mating surface of the first mold plate 11 and the movable plate 13 is set as a parting line when the mold is opened after injection molding. Further, a film suction port 16 communicating with the cavity 15 is formed in the first template 11, and the film is sucked from the film suction port 16 during vacuum forming.

The moving plate 13 is provided with a film holder 17 on the mating surface with the second mold plate 12. When each of the mold plates 11, 12 and the moving plate 13 are in the vacuum forming position, the film retainer 17 decorates the decorative film 1 (the actual product is very thin, but the thickness is emphasized in FIG. 1) as shown in FIG. (Shown in FIG. 3) is held around the cavity 15. FIG. 1 shows a state in which the peripheral portion of the decorative film 1 is held by a film holder 17,
While heating the film with a film heating means (not shown).
The film 1 by suction from the cavity 1
5 shows a state where it has been formed into a shape along 5.

[0014] The second mold plate 12 is used to transfer the molded product to the cavity 15.
And a molded product extruding mechanism 18 for separating the molded product.
The molded product pushing mechanism 18 is composed of a pushing pin 19, a pushing plate 20, and a driving means (not shown), and a position where the tip of the pushing pin 19 is aligned with the surface of the second template 12 on the moving plate 13 side. It is possible to move between the position protruding to the left side of the drawing and the left side.

In the above structure, first, as shown in FIG. 1, the first and second template plates 11 and 12 and the moving plate 13 are placed in a vacuum forming position, and the edge of the decorative film 1 is held by the film holder 1.
Then, the film 1 is deformed into a shape along the cavity 15 by sucking air from the suction port 16 while heating the film with the heating means. Next, while the decorative film 1 is left in the cavity 15, the first mold plate 11 and the second mold plate 12 are clamped with a moving plate as shown in FIG. 2 to perform injection molding (in FIG. Is indicated by a thick solid line).

When the injection molding is completed and the plastic material 2 is solidified, the first mold plate 11 is separated from the moving plate 13 as shown in FIG.
2 (approximately 10 mm) away from the peripheral edge of the film by the moving plate 13 and the second template 12 is released. Then, the molded product 3 is extruded from the cavity 15 by the molded product pushing mechanism 18. At this time, the decorative film 1
Has a peripheral edge that extends outside the cavity 15,
Since it is flexible, the cavity 15
It is pulled out from outside.

As described above, in the above configuration, the cavity 15 is formed in the first mold plate 11 and the movable plate 13 so that the boundary surface is used as a parting line when the mold is opened.
When the decorative film 1 is vacuum formed, the first mold plate 11 and the moving plate 13 are integrated so that the decorative film 1 extends along the entire cavity 15, so that the molded product 3 is almost entirely formed as shown in FIG. Is covered with the decorative film 1.
Therefore, when a wood grain panel using a film with a wood grain pattern as the decorative film 1 is mounted on a dashboard or the like of an automobile, a part without a wood grain sheet is seen when viewed from the side unlike a conventional case. Can be prevented.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing one embodiment of a plastic molding die according to the present invention, and shows a vacuum molding state.

FIG. 2 is a sectional view showing an injection molding state of the mold of FIG.

FIG. 3 is a cross-sectional view showing a mold opening state of the mold of FIG. 1;

FIG. 4 is a cross-sectional view of a molded product manufactured using the mold of FIG.

FIG. 5 is a cross-sectional view of a molded product manufactured by a conventional molding method.

FIG. 6 is a cross-sectional view showing a vacuum forming step of a conventional forming method.

FIG. 7 is a cross-sectional view showing an injection molding step of a conventional molding method.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Decorative film 2 Plastic material 3 Molded product 10 Die 11 1st mold plate 12 2nd mold plate 12a Guide hole 13 Moving plate 13a Guide hole 14 Guide rod 15 Cavity 16 Suction port 17 Film press 18 Mold extrusion mechanism 19 Extrusion pin 20 Extrusion plate

Claims (1)

[Claims] 1. A movable plate provided between a first template (11) and a second template (12), which are relatively movable, and both templates (11, 12).
(13), wherein the first and second template plates (11, 12) and the movable plate (13) are the first and second mold plates.
A vacuum forming position where the template (11) and the moving plate (13) are integrated and separated from the second template (12); a first template (11) and a second template (12)
And the injection molding position where the moving plate (13) is clamped, the moving plate (13) is separated from the first template (11), and the moving plate (13) and the second template (12) are slightly A cavity (15) is formed in the first mold plate (11) and the movable plate (13), and the first mold plate (11) and the movable plate (13) are formed. ) Is set as a parting line when the mold is opened after injection molding. The moving plate (13) is joined to the mating surface with the second mold plate (12), and the moving plate (13) is vacuum formed. Decorative film when in position (1)
While the edge of the moving plate is held around the cavity (15).
(13) is provided with a film retainer (17) which retreats from the mating surface when it is at the injection molding position and the mold opening position, and the first mold plate (11) has a film suction port ( A mold for plastic molding, comprising: the second mold (12) plate; and a molded product extrusion mechanism (18) for separating the molded product (3) from the cavity (15).