JPH0745148B2 - Molding device for simultaneous injection painting - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to an improvement of a pattern transfer device for transferring a pattern drawn on a transfer film to a product (molded product with injection) by injection molding or the like, and particularly to transfer. The present invention relates to an optimum injection simultaneous painting molding device which is optimally used when a transfer paper which is thin and easily deformed is used as a film.

[Conventional technology]

Conventionally, as a molding apparatus for simultaneous injection painting, a molding apparatus as shown in FIG. 6 has been generally known.

That is, in this apparatus, a female mold 1 having a cavity 1a for vacuum forming, pressure forming or vacuum pressure forming, and a film 2 to be formed are conveyed through a position facing the cavity 1a of the female mold 1. The film feed mechanism 6 including the unwinding roll 3, the winding roll 4, and the guide rollers 5 and 5 arranged above and below, and the position where the film feeding mechanism 6 descends from the standby position above the female mold 1 and faces the cavity 1a. The bird
A heating plate 7 that advances toward the cavity 1a to adsorb the film 2, heats the film 2 and blows it onto the cavity wall surface, and a positioning sensor 8 for positioning the film 2 are provided. Then, the transfer film 2 is conveyed, and the transfer film 2 is positioned and fixed to the cavity 1a through the positioning sensor 8 and then vacuum pressure air molding or the like is performed. Thereafter, the mold clamping is performed and the injection molding is performed. . After that, the product (painting molded product) was taken out, the film 2 was again conveyed downward, the above molding was repeated, and the film 2 after transfer was wound up by the winding roll 4 as it was.

[Problems to be Solved by the Invention]

However, in the case of the above-mentioned conventional example, since the heating plate 7 blows compressed air from the blowing hole 7a and blows the film that has been heated and softened on the wall surface, the convex portion at the time of injection molding is applied to the transferred film 2. 2a is generated, and when it is wound up by the winding roll 4 as it is, as shown in FIG. 4 and FIG. 5, the film 2 corrugates upward and wrinkles 2b occur. When the film 2 is adsorbed on the film 7, wrinkles 2c remain on the surface of the film 2 as shown in FIG. 7, and when injection molding is further performed, the wrinkles are formed on the surface of the decorative molded product. was there.

In order to prevent the occurrence of wrinkles, it is conceivable to cut and remove the convex portion 2a of the film 2 that has been molded and transferred in the previous step, and then continue the film 2 and wind it by the winding roll 4. In this case, the film 2 has to be cut and spliced for each shot, resulting in a marked decrease in productivity.

In view of the above, the present invention does not reduce productivity, and by adding a relatively simple device, wrinkles occur in the film due to wrinkles in the film in vacuum pressure air forming etc. It is an object of the present invention to provide a molding apparatus for simultaneous injection painting which can surely prevent the occurrence of such a situation.

[Means for Solving the Problems]

In order to achieve the above object, the present invention provides a female die 1 having a cavity 1a for molding, and a film feed mechanism for feeding a film 2 to be molded so as to pass through a position facing the cavity 1a of the female die 1. 6 and the cavity 1a from the standby position
A heating plate 7 which moves to a position facing the cavity 1a and contacts the film 2 at a position facing the cavity 1a to heat it, and a spraying provided on the heating plate 7 for spraying the heated film 2 on the cavity wall surface. A pair of wrinkle-prevention guide bars 11 in a simultaneous injection-molding molding apparatus having a hole 7a and a male die 20 that is combined with the female die 1 after the heating plate 7 is separated from the position facing the cavity 1a. Are arranged at a downstream side of the female mold 1 in the transport direction of the film 2 at an interval that allows the convex portions 2a generated during the molding of the film 2 to pass therethrough, and have a rotation center in the width direction of the film 2. The member 10 has a structure in which both ends of the pair of wrinkle preventing guide bars 11 are supported.

[Action]

According to the present invention configured as described above, before the heating plate comes into contact with the film facing the cavity surface, tension is applied to the film by rotating the pair of wrinkle prevention guide bars while sandwiching the film. By this tension, the wrinkles that extend upward from the wrinkle prevention guide bar are stretched, and the wrinkle-free state is obtained. Therefore,
It is possible to surely prevent wrinkles from being generated in the molded product with a picture because the wrinkle-free state is obtained at the time of vacuum pressure molding.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS.

The female mold 1 is provided with a cavity 1a for vacuum forming, pressure forming or vacuum pressure forming, and the film 2 to be formed is conveyed through a position facing the cavity 1a of the female mold 1. There is provided a film feeding mechanism including an unwinding roll 3, a winding roll 4, and guide rollers 5 and 5 arranged above and below.

As the film 2, for example, PVC of about 40μ and 20μ
There is a laminate of approximately nylon and a printing ink applied on the surface of this nylon, a coating of printing ink on the surface of PET of about 50μ, etc., which can be selected as appropriate depending on the injection resin and the curvature and unevenness of the mold. To do.

While reciprocating between the position facing the cavity 1a and the standby position by the action of a cylinder or the like, the cavity 1a
The heating plate 7 is arranged so that it can move back and forth in the direction of (1) and comes into contact with the film 2 at a position facing the cavity 1a (the film 2 may be adsorbed to the heating surface by the blowing hole 7a which also serves as a blowing hole). A positioning sensor 8 for positioning is provided above this.

Also, a male die 20 that faces the female die 1 and can be contacted with and separated from the female die 1.
Is provided, and an injection port 21 is bored in this male die 20.

A wrinkle prevention mechanism 9 for preventing wrinkles of the film shown in FIG. 3 is provided in the lower part of the female mold 1. The wrinkle prevention mechanism 9 is provided on the rotary member 10 and the rotary member 10. It is provided with a pair of wrinkle-preventing guide bars 11 which are installed apart from each other in the diametrical direction, extend long in the width direction of the film 2, and rotate with the rotation of the rotating member 10.

Next, the operation of the above embodiment will be described.

First, the transfer film 2 is conveyed, and after the first molding is completed, a winding roll 4 for feeding a new pattern portion of 1 pitch to a position facing the cavity 1a of the female mold 1.
Is rotated by the positioning sensor 8, and the film 2 is stopped when a new pattern comes to a position facing the cavity 1a. Next, as shown in FIGS. 2 and 3, the rotating member 10 is rotated by a predetermined angle in the direction of the arrow, and a pair of wrinkle preventing guide bars 11 sandwich the film 2 and apply tension to the film 2, As a result, wrinkles extending from the lower side to the upper side are stretched in the film 2. That is, a convex portion 2a is formed on the transferred film 2 at the time of injection molding, and when the convex portion 2a is wound up by the winding roll 4 as it is, the convex portion 2a shown in FIGS.
As shown in the figure, since the film 2 corrugates upward and wrinkles 2b are generated, tension is applied to the film 2 through the wrinkle prevention guide bar to stretch the wrinkles, and Wrinkles 2b extending upward from the wrinkle prevention guide bar 11 are eliminated. Further, when the convex portion 2a of the film is taken out of the female mold, the rotating member 10 is rotated as shown in FIG. As a result, it is possible to prevent the convex portion 2a from strongly contacting the guide bar 11 so that the wrinkles on the film do not spread to the female mold as much as possible. Further, the product corresponding to the convex portion 2a can be protected from being applied with a large force. Then, the heating plate 7 is placed in the cavity 1a.
Of the cavity 1a, the heating plate 7 is brought into contact with the film 2 on the surface of the cavity 1a, and the male die 1 and the heating plate 7 are joined at the peripheral edge of the cavity 1a. After fixing, the film 2 is heated by the heating plate 7, and compressed air is blown out from the blowing hole 7a to heat the softened film to the wall surface of the cavity. After that, the heating plate 7 returns to the original standby position, the female die 1 and the male die 20 are coupled, and the resin is injected into the cavity 1a. Then, the mold is clamped and injection molding is performed.

After that, after taking out the product (molded product with a picture), the film 2 is conveyed again while removing the wrinkles, and the above molding is repeated.

〔The invention's effect〕

Since the present invention is configured as described above, when the new pattern of the film comes to the position facing the cavity, the rotating member is rotated by a predetermined angle to apply tension to the film with the pair of wrinkle preventing guide bars. It is possible to eliminate wrinkles from above, and when the projections formed by injection molding on the film pass through the pair of wrinkle prevention guide bars, rotate the rotating member in the opposite direction by a predetermined angle and the projections form a pair of wrinkles. It is possible to prevent the wrinkles from increasing by smoothly passing between the prevention guide bars so that the film does not undulate toward the female mold. Therefore, it is possible to eliminate wrinkles at the molding portion on the film at the time of molding and obtain a molded product with a good quality. Further, it is possible to prevent the deformation and stain of the product corresponding to the convex portion.

[Brief description of drawings]

1 and 2 show an embodiment of the present invention. FIG. 1 is a partially cut front view showing a main part, and FIG. 2 is a state in which tension is applied to a film by a wrinkle preventing guide bar. FIG. 4 is a plan view showing the relationship between the heating plate and the film, FIG. 5 is a side view showing the wrinkles generated in the film, and FIG. Indicates the conventional example
FIG. 7 is a view corresponding to FIG. 4 showing the state of wrinkles after heating. 1 ... Female mold, 1a ... Cavity, 2 ... Film, 6 ...
… Film feed mechanism, 7… Heating plate, 11… Wrinkle prevention guide bar, 20… Male type.

Claims (1)

[Claims] 1. A female die having a cavity for molding, a film feeding mechanism for feeding a film to be molded so as to pass through a position facing the cavity of the female die, and a position facing the cavity from a standby position. A heating plate that moves to and contacts a film at a position facing the cavity to heat the film, a blowing hole provided in the heating plate for spraying the heated film onto the cavity wall surface, and the heating plate is the cavity. In a molding apparatus for simultaneous injection painting with a male mold combined with the female mold after being separated from a position facing each other, a pair of wrinkle prevention guide bars are provided on the downstream side of the female mold in the transport direction of the film. The pair of wrinkle-preventing members are provided on a rotating member having a rotation center in the width direction of the film, which is arranged at an interval that allows the protrusions generated during the molding of the film to pass through. Injection foil-decorating molding apparatus opposite ends of Idoba is characterized in that it is supported.