JPH0423892B2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field]

The present invention relates to a mold for a simultaneous injection molding and decorating apparatus. More specifically, a molded product is obtained by injection molding, and at the same time, a film printed with a design such as a design or a functional material such as an electromagnetic shielding material is fused and integrated onto the surface of the molded product. This invention relates to a mold used in a molding and decorating device. The mold for simultaneous injection molding and decorating according to the present invention is capable of stably cutting a film within the mold. The mold for simultaneous injection molding and decoration molding according to the present invention is applicable to molding various decorative molded products, such as lunch boxes, trays, parts for electrical appliances, cosmetic containers, etc.

[Conventional technology]

The following structure is known as a typical mold for an injection molding and simultaneous painting device that punches out a film in a mold. A fixed side plate and a movable side plate that are opened and closed via a guide bar, a clamp plate that is located between the fixed side plate and the movable side plate and on the fixed side plate side and slides the guide bar, and a fixed plate. It consists of a space plate located between the side plate and the movable side plate and on the side of the movable side plate on which the guide bar slides. In this conventional technology, when closing the mold, the film sandwiched between the clamp plate and the space plate is removed by using the clearance between the outer periphery of the convex portion of the movable plate and the inner periphery of the clamp plate. This is what the cutting takes place.

[Problem to be solved by the invention]

However, in the conventional technique, the film could not be stably cut because the clearance between the outer peripheral edge of the convex portion of the movable plate and the inner peripheral edge of the clamp plate was not constant. Since the stationary side plate and the movable side plate are directly attached to the injection molding device, no positional deviation occurs between them. However, since the positioning between the space plate, the clamp plate, and the movable side plate is not performed accurately, punching errors are likely to occur. The reason is as follows. The space plate and the clamp plate are provided with through holes for passing the guide bar through. If the diameter of this through hole is small, the mold cannot be opened and closed smoothly when the guide bar thermally expands during operation of the injection molding apparatus, and a large load is placed on the mold. Therefore, in reality, the diameter of the through hole has to be increased. As a result, it becomes difficult to position the center of the guide bar at the center of the through hole of the space plate and the clamp plate. Therefore, when punching the film, the clearance between the outer circumferential edge of the convex portion of the movable plate and the inner circumferential edge of the clamp plate is not constant. If the clearance is too large or there is no clearance, the film will not be able to be cut. This is particularly noticeable in the case of thin films.

[Means to solve the problem]

As a result of various studies in view of these problems, the inventor of the present invention has found that the intended purpose can be achieved by making sure that the center of the guide bar is always located at the center of the through hole of the clamp plate when cutting the film. They got the idea that it could be done, and based on this idea, they completed the present invention. That is, the mold for the simultaneous injection molding and decorating apparatus according to claim 1 of the present invention includes a fixed plate 2 and a movable plate 3 that are opened and closed via the guide bar 1, and the fixed plate 2 and the movable plate. 3 and located on the fixed side plate 2 side to slide the guide bar 1; and a clamp plate 4 located between the fixed side plate 2 and the movable side plate 3 and on the movable side plate 3 side. In a mold for an injection molding simultaneous painting device comprising a space plate 5 that is positioned and slides a guide bar 1: a first protrusion 6 is formed on one side of the opposing surfaces of the clamp plate 4 and the space plate 5, and a second protrusion 6 is formed on the other side. A first recess 7 is provided which fits into one projection 6, and a second projection 8 is fitted into one of the opposing surfaces of the movable side plate 3 and space plate 5, and into which the second projection 8 is fitted into the other surface. It is characterized in that a matching second recessed portion 9 is provided. Furthermore, the mold for the simultaneous injection molding and decorating apparatus according to claim 2 of the present invention includes a fixed plate 2 and a movable plate 3 that are opened and closed via the guide bar 1, and the fixed plate 2 and the movable plate. 3 and located on the fixed side plate 2 side to slide the guide bar 1; and a clamp plate 4 located between the fixed side plate 2 and the movable side plate 3 and on the movable side plate 3 side. In a mold for an injection molding simultaneous painting device consisting of a space plate 5 that is positioned and slides a guide bar 1: the surface of the clamp plate 4 facing the space plate 5 and the surface of the movable side plate 3 facing the space plate 5. A first protrusion 6 that penetrates the space plate 5 is provided on one of the two, and a first protrusion 6 that penetrates the space plate 5 is provided on the other.
It is characterized by being provided with a first recessed portion 7 that fits into the first recessed portion 7. Next, the detailed structure of the mold for the simultaneous injection molding and decorating apparatus according to claim 1 of the present invention will be explained based on FIGS. 1 to 5. 1 indicates a guide bar. In the drawing, one end of the guide bar 1 is fixed to the blind hole 10 of the fixed side plate 2, and the other end is fixed to the blind hole 10 of the movable side plate 3.
1 is slidably fitted. On the contrary, one end of the guide bar 1 may be fixed to the blind hole 11 of the movable plate 3, and the other end may be slidably fitted into the blind hole 10 of the fixed plate 2. The clamp plate 4 is provided with a through hole 12, and the space plate 5 is provided with a through hole 13. The clamp plate 4 is located on the fixed side plate 2 side, and the space plate 5 is located on the movable side plate 3 side, and the guide bar 1 is inserted through the through holes 12 and 13, respectively. In the drawing, a first protrusion 6 is provided on the front surface of the space plate 5, and a first recess 7 into which the first protrusion 6 fits is provided on the rear surface of the clamp plate 4. Further, a second protrusion 8 is provided on the rear surface of the space plate 5, and a second recess 9 into which the second protrusion 8 fits is provided on the front surface of the movable plate 3. On the contrary, the first protrusion 6 may be provided on the rear surface of the clamp plate 4, and the first recess 7 into which the first protrusion 6 fits may be provided on the front surface of the space plate 5. Further, a second protrusion 8 may be provided on the front surface of the movable plate 3, and a second recess 9 into which the second protrusion 8 fits may be provided on the rear surface of the space plate 5. In the figure, 14 is the spool, 15 is the cavity,
16 is a film, 17 is a roll, 18 is an outer peripheral edge of a convex portion of the movable plate 3, and 19 is an inner peripheral edge of a clamp plate 4. Next, a method for obtaining a decorated molded product using the mold for the simultaneous injection molding and decorating apparatus according to claim 1 of the present invention will be described. The film 16 unwound from the roll 17,
It is positioned and set at a predetermined location between the fixed side plate 2 and the movable side plate 3 (see Fig. 1). This positioning can be performed using a film positioning means (not shown). The clamp plate 4, which is linked to an ejector (not shown), slides on the guide bar 1 and moves toward the space plate 5, and the film 16 is moved between the clamp plate 4 and the space plate 5.
to clamp. The clamp plate 4 and the space plate 5 are provided with a first protrusion 6 and a first recess 7 that fits into the first protrusion 6 on opposing surfaces. It is fitted into the section 7 and integrated (see Fig. 2). Therefore, the positional relationship between the clamp plate 4 and the space plate 5 is always constant. Next, the movable plate 3 is attached to the fixed plate 2.
Move to the side. At this time, the integrated space plate 5 and clamp plate 4 also move toward the fixed plate 2 side. The movable plate 3 and the space plate 5 are provided with a second protrusion 8 and a second recess 9 that fits into the second protrusion 8 on opposing surfaces, but at this point, the second protrusion 8 and the second recess 9 are provided. is in a state of disagreement with the center of In the drawing, the center of the second protrusion 8 is located below the center of the second recess 9 due to the weight of the space plate 5 and clamp plate 4 (see FIG. 3). Therefore, the movable side plate 3 is replaced with the fixed side plate 2.
Move it further to the side. Then, the second protrusion 8
The space plate 5 is guided into the second recess 9 and gradually adjusts its position.
Then, the movable plate 3 approaches the clamp plate 4 side. At this time, the cavity forming surface at the tip of the convex portion of the movable plate 3 has reached the film 16 (see FIG. 4). The movable plate 3, space plate 5, and clamp plate 4 move toward the fixed plate 2 while keeping the positional relationship as it is. At the same time that the second protrusion 8 of the space plate 5 fits into the second recess 9 of the movable plate 3, the film 16 closes the clearance between the outer circumferential edge 18 of the convex part of the movable plate 3 and the inner circumferential edge 19 of the clamp plate 4. (See Figure 5). Note that the punched film 16 is in an unclamped state. As a means for holding the film 16 on the cavity forming surface of the movable plate 3, for example, a vacuum means may be provided on the movable plate 3 side, or a compressed air means may be provided on the fixed plate 2 side. However, when the film 16 has a certain thickness, it is possible to proceed to the injection process as it is without taking such measures. When the mold closure is completed, molten resin is injected from the spool 14. After that, the mold is opened and the molded product is taken out. Next, regarding the mold for the simultaneous injection molding and decorating apparatus according to claim 2 of the present invention, only the differences from the mold for the simultaneous injection molding and decorating apparatus according to claim 1 described above will be explained. In FIG. 6, a first protrusion 6 is provided on the surface of the clamp plate 4 facing the space plate 5, and a first recess 7 is provided on the movable side plate 3 facing the space plate 5.
It is located on the surface of the In this case, film 16
is clamped between the clamp plate 4 and the space plate 5, but at this time, the long first protrusion 6 passes through the through hole 20 of the space plate 5,
Clamp plate 4 and space plate 5 are integrated. Note that the first protrusion 6 is located on the movable side plate 3.
The first recessed portion 7 may be provided on the surface of the clamp plate 4 . In this case, after the film 16 is clamped between the clamp plate 4 and the space plate 5, the first protrusion 6 passes through the through hole 20 of the space plate 5. Experimental Example A mold for an injection molding simultaneous decoration apparatus according to claim 1 of the present invention and a mold for an injection molding simultaneous decoration apparatus described in the section of the prior art were prepared and molded under the same conditions.
The films used were polyethylene terephthalate with thicknesses of 188 μm and 125 μm. In the mold for the injection molding simultaneous painting device according to claim 1 of the present invention, both films with thicknesses of 188 μm and 125 μm were molded 200 times in a row, but the film was punched out with a sharp cut and the molded product was molded. It was attached to. On the other hand, in the mold for the simultaneous injection molding and decorating apparatus described in the prior art section, it became impossible to punch out a film with a thickness of 188 μm after 50 punches. Also the thickness
It was not possible to punch out a 125 μm film at all.

【Effect of the invention】

With the above configuration, the present invention can obtain the following effects. That is, in the mold for an injection molding simultaneous decorating device according to claim 1, the first protrusion fits into the first recess, and the second protrusion fits into the second recess, and the mold according to claim 2 In the mold for the simultaneous injection molding and painting device according to the above, since the first protrusion fits into the first recess, the fixed side plate, movable side plate, clamp plate, and space plate are all always in a constant positional relationship. becomes. Therefore,
Since the clearance between the outer peripheral edge of the convex portion of the movable plate and the inner peripheral edge of the clamp plate is constant, the film can be stably cut.

[Brief explanation of drawings]

1 to 5 are schematic cross-sectional views showing the operating process of one embodiment of a mold for an injection molding simultaneous decorating device according to the present invention, and FIG. 6 is an operating state of another embodiment of the present invention. It is a schematic explanatory sectional view showing. In the figure, 1... Guide bar, 2... Fixed side plate, 3... Movable side plate, 4... Clamp plate, 5... Space plate, 6... First protrusion, 7... First recessed part, 8...Second protrusion, 9...
Second depression.

Claims (1)

[Claims] 1. A fixed plate 2 and a movable plate 3 that are opened and closed via a guide bar 1, and a plate that is located between the fixed plate 2 and the movable plate 3 and on the fixed plate 2 side. A clamp plate 4 that is positioned and slides the guide bar 1, and a fixed side plate 2
and a space plate 5 which is located between the movable plate 3 and on the movable plate 3 side and slides the guide bar 1. In the mold for the injection molding simultaneous painting device: the clamp plate 4 and the space plate. A first protrusion 6 is provided on one of the surfaces facing the movable side plate 3 and the space plate 5, and a first recessed portion 7 that fits into the first projection 6 is provided on the other side. A mold for an injection molding and simultaneous decorating device, characterized in that a second protrusion 8 is provided on one side, and a second recess 9 that fits into the second protrusion 8 is provided on the other side. 2 A fixed plate 2 and a movable plate 3 that are opened and closed via the guide bar 1, and a guide bar 1 that is located between the fixed plate 2 and the movable plate 3 and on the fixed plate 2 side. Clamp plate 4 that slides and fixed side plate 2
In a mold for an injection molding and simultaneous painting device, the space plate 5 is located between the movable plate 3 and the movable plate 3 and slides the guide bar 1: facing the space plate 5. A first protrusion 6 that penetrates the space plate 5 is provided on either the surface of the clamp plate 4 or the surface of the movable plate 3 facing the space plate 5, and a first depression that fits into the first protrusion 6 is provided on the other side. A mold for an injection molding and simultaneous decorating device, characterized in that a portion 7 is provided.