JPH06328501A - Injection molding simultaneous foil decorating method - Google Patents

Abstract

PURPOSE:To provide an injection molding simultaneous foil decorating method by which foil decorating is properly performed even on the outer face of a molded form wherein depth is comparatively deep without being accompanied with a large warp and a shift in position. CONSTITUTION:A decorative film 10 is temporarily stuck on the outside face 15a of a film supporting fixture 15. The film supporting fixture 15 is inserted into the cavity of a female mold and the outer face side of the decorative film 10 is vacuumized and sucked in the cavity. Together therewith, in accordance with necessity, compressed air is supplied to the inner face side of the decorative film 10 through the film supporting fixture 15. Thereby the decorative film 10 is separated from the film supported fixture 15 and transferred so as to laid along the inside face of the cavity. Thereafter the film supporting fixture 15 is taken out from the inside of the cavity and normal injection molding is performed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an injection molding simultaneous painting method for painting an outer surface of a molded body at the same time as injection molding. It relates to a suitable method for making the attachment.

[0002]

2. Description of the Related Art Conventionally, a molding apparatus 60 as shown, for example, in FIG. 19 has been used to carry out a method for painting an outer surface of a molded body simultaneously with injection molding (Japanese Patent Publication No. See also Japanese Patent No. 42172). This device 60 includes a female die 70 and the female die 70.
And a male mold 80 that is disposed to face the side of. The female mold 70 is provided with a cavity 72 corresponding to the outer shape of the molded body to be obtained, and an intake hole 74 opening to the cavity 72 is provided therein, and the male metal is moved by the advancing / retreating device 75 including a cylinder or the like. The mold 80 can be moved back and forth in a direction of approaching and separating from the mold 80. Further, the male die 80 has a core portion 82 inserted into the cavity 72, and a molten resin pouring hole (gate) 84 is provided therein. A hot platen 90 is arranged between the female die 70 and the male die 80 so as to be able to move back and forth. The heating plate 90 has a front surface (female mold 70 side) as a heating surface.

In order to perform painting simultaneously with injection molding using such a device 60, first, a decorative film 100 for painting is arranged on the side of the female die 70 so as to face it, and the decorative film 100 is placed on the hot plate. It is heated and softened by 90 (FIG. 19), then, the opening surface of the cavity 72 is closed by sandwiching the decorative film 100 between the female mold 70 and the heating plate 90, and through the air intake hole 74 provided in the female mold 70. In addition to evacuation, compressed air is supplied through ventilation holes (not shown) provided in the heating plate 90 as needed.

As a result, the decorative film 100 is shown in FIG.
As shown in FIG. 3, the cavity 72 is stretched along the inner peripheral surface of the cavity 72 to be in close contact therewith. Note that this step is generally called preforming. Subsequently, with the hot platen 90 retracted, as shown in FIG. 21, by advancing the female mold 70, the female mold 70 is united with the male mold 80 to perform mold clamping, and then the female mold 70 is removed. The molten resin is injected and filled into the cavity space formed between the male mold 80 and the male mold 80 through a pouring hole 84 provided in the male mold 80, and injection molding is performed.

As a result, the decorative film 100 in the female die 80 is integrally attached to the injected resin (molded product P),
When the mold is opened after the completion of injection molding, the molded product having the decorative film 100 attached to the outer surface is taken out from the inside of the mold. Here, when the decorative film 100 is a laminated laminated film (laminate film), it means that painting is performed as it is, and all the layers of the decorative film 100 are adhered and integrated on the outer surface of the molded body S. Become a layer. On the other hand, when the decorative film 100 is a transfer film, only the base film of the decorative film 100 integrated on the outer surface of the molded body S is peeled off in a later step,
Painting is completed by leaving a transfer layer such as a pattern layer on the molded body S side to form a decorative layer.

[0006]

In the conventional simultaneous injection-molding painting method, a decorative film is arranged on the cavity opening surface side of a female mold, and it is evacuated as in the conventional example described above, or the core member is used. Since it is pushed into the cavity so as to be drawn along the inner peripheral surface of the cavity so as to follow the cavity, the decorative film for painting has to be stretched in the mold cavity. In this case, the amount of stretching of each part of the decorative film is not constant and varies depending on various conditions.
Therefore, when the decorative film is stretched greatly,
As a matter of course, the pattern layer and the like formed on it are stretched, causing considerable distortion and displacement that cannot be ignored, and the desired surface cannot be painted. In extreme cases, wrinkles and tears may occur.

By heating and softening the decorative film in advance by using a heating plate as in the conventional example, the disadvantages associated with the stretching of the decorative film as described above can be avoided to some extent. It was difficult to paint as expected when molding a product having a large depth (for example, a cabinet of a television receiver), that is, a film having a relatively large amount of stretching and drawing of a decorative film. In particular, it was virtually impossible to properly paint the outer surface portion of a deep molded body.

In view of the above point, the present invention provides an injection molding simultaneous painting method capable of appropriately painting an outer surface of a molded body having a relatively deep depth without causing large distortion or displacement. The purpose is to do.

[0009]

In order to achieve the above-mentioned object, the injection molding simultaneous painting method (corresponding to claim 1) according to the first invention of the present application has a decorative film for painting having a three-dimensional shape. The film support is temporarily fixed to the outer side of the film support and inserted into the cavity of the female mold, and the outer surface side of the decorative film is vacuum-sucked in the cavity, and the decorative film is optionally used. By supplying compressed air to the inner surface side of the film support tool, the decorative film is detached from the film support tool and transferred so as to be along the cavity inner side surface, and then the film support tool is It is taken out from the cavity and subjected to normal injection molding.

In the injection molding simultaneous painting method according to the second invention of the present application (corresponding to claim 2), the decorative film is cut into the shape of the development view corresponding to the shape of the molded body, and the cut film is cut. After the decorative film is bent and temporarily fixed along the outer peripheral surface of the film support having a three-dimensional shape corresponding to the molded body, the decorative film is released from the film support in the same manner as above, It is moved so as to follow the inner peripheral surface of the cavity, and then the film support is taken out of the cavity and subjected to normal injection molding.

In the injection molding simultaneous painting method according to the third invention of the present application (corresponding to claim 3), a front die for forming a front surface of a molded body to be obtained and an outer side surface of the molded body are formed. For preparing a female mold having a cylindrical mold that is separable from the front mold, perform the following steps in an appropriate order, and then perform normal injection molding. To be done. That is, the step of arranging the decorative film for front surface painting on the front mold oppositely, the step of temporarily fixing the decorative film for side surface painting to the outer surface of the film support having a three-dimensional shape, the decorative film is A step of inserting the temporarily fixed film support into the tubular mold, in the same manner as above, so that the decorative film is detached from the film support so as to follow the inner surface of the cylindrical mold. A step of transferring the film, a step of taking out the film support from the tubular mold after the transfer of the decorative film, and a step of assembling the female mold by combining the cylindrical mold and the front mold. In this case, as a preferable order, in addition to the above circled code order, the order of ----- is mentioned.

In the injection molding simultaneous painting method (corresponding to claim 6) according to the fourth invention of the present application, a decorative film for painting is arranged so as to be along the inner peripheral surface of the cavity of the female mold by an appropriate method. Then, under the condition that the decorative film is heated and softened in the cavity of the female mold as needed, the outer surface side is vacuum-sucked, and the inner surface side of the decorative film is supplied with compressed air as necessary. Then, the decorative film is brought into close contact with the inner peripheral surface of the cavity of the female mold, and then ordinary injection molding is performed.

In the injection molding simultaneous painting method of each of the above inventions, both a laminated laminated sheet and a transfer sheet can be used as a decorative film, and it is conventionally known that they can be applied to the injection molding simultaneous painting method. It is possible to select and use any one of various decorative films. In the injection molding of the present invention, in addition to the method of injecting a thermoplastic resin that is melted by heat, an uncured liquid of a curable resin that is cured by a chemical reaction is injected.
It also includes IM molding method. In this case, a resin "solution" which is not heat-melted is used. Therefore, in the present specification, the term "molten resin" means that in addition to the resin in the molten state by heating,
It includes the above-mentioned resin solution.

The above-mentioned film support is not limited in shape as long as it can be inserted into the cavity of the female mold, and has various solid shapes such as a rectangular parallelepiped shape, a frame shape, a cylindrical shape, and a cylindrical shape. The outer peripheral surface shape of the film support tool and the inner peripheral surface shape of the cavity of the female die (the outer peripheral surface shape of the molded body to be obtained can be used. ) And are preferably similar to each other.

Further, as the film support, a preferred embodiment is to heat and soften the decorative film by using a heating plate having a function capable of heating the temporarily fixed decorative film. It is also a preferable embodiment that a ventilation hole is provided in the side surface of the air vent so that the compressed air is supplied through the ventilation hole. A male die used for injection molding may be used as the film support.

Furthermore, when a hot platen is used as the film support, in addition to a system (contact heating system) in which a decorative film is brought into direct contact with the outer peripheral surface to heat it by heat conduction, for example, the outer peripheral surface of the hot plate ( Provide a pair of flange-shaped convex walls on both sides of the heating surface), and temporarily fix both ends (both ears) of the decorative film to the convex walls so that the pattern portion of the decorative film does not contact the heating surface. A method of heating the decorative film by infrared radiation from the heating plate (heating surface) and / or heat conduction through air between the heating surface (non-contact heating method) can also be adopted (see Examples below). ). In this non-contact heating method, even if a heating plate having ventilation holes (described above) for supplying compressed air on the heating surface is used, the unevenness of the heating surface is not formed on the decorative film. It is particularly effective for such a thin decorative film.

When temporarily fixing the decorative film to the film support, the decorative film may be moved or the film support may be rotated so as to correspond to the decorative surface of the molded product for which the decorative film is to be obtained. The film support may be attached so as to cover the entire circumference thereof, or may be attached so as to partially cover the film support. At that time, if necessary, for example, a positioning mark is provided on the decorative film side, and the mark is detected by a detection means such as a visual sensor using a photoelectric tube or CCD, and the like. A preferable mode is to perform the alignment between the pattern) and the film support (similar to the shape of the molded product to be obtained) (see Examples below).

For temporary fixing of the decorative film, for example, static charge is applied to the film side or the support side, a transparent temporary fixing adhesive is used, vacuum suction is performed through a ventilation hole provided in the film support, or a film retainer. Techniques such as using mechanical fixing means such as rollers and clamp fittings can be adopted. On the other hand, the female mold and the male mold used in the simultaneous injection-molding method of the first invention and the second invention may basically have the same structure as the conventional one. There is no problem even if irregularities or the like are provided on the molding surface (therefore, irregularities are formed on the molded product).

The decorative film may be supplied in a required amount from a continuous strip film wound into a coil, or may be a sheet film cut into a predetermined size in advance.

[0020]

[Operation] In the simultaneous injection-molding painting method (claim 1) according to the above-mentioned first invention, the decorative film is temporarily fixed to the outer surface of the film support, and the film support is attached to the cavity of the female mold. It is inserted into the inside of the cavity, and the decorative film is transferred in the cavity so as to be along the inside surface of the cavity of the female die by vacuum suction or the like. It can be made significantly smaller than the case.

Therefore, it is possible to appropriately paint a molded product having a relatively deep depth, for example, the outer surface of a television receiver cabinet, a plastic can, or the like, without causing large distortion, misalignment, wrinkles, or tears. Is possible. In the injection molding simultaneous painting method (claim 2) according to the above-mentioned second invention, the decorative film is cut into the shape of the developed view, and the cut decorative film is made to follow the outer peripheral surface of the film support. Since the decorative film is bent and fixed temporarily, the decorative film can be temporarily fixed to the outer periphery of the film support without being stretched so much. Since the molds are transferred so as to be along the inner peripheral surface of the cavity, the amount of stretching of the decorative film along the inner peripheral surface of the cavity can be significantly reduced as compared with the conventional method.

Therefore, in the same manner as the first aspect of the present invention, in addition to the fact that the outer surface of the molded body having a relatively deep depth can be appropriately painted without causing a large distortion or positional deviation, the molding can be performed. The front of the body can also be painted appropriately and accurately. In the injection molding simultaneous painting method according to the third aspect (claim 3), the female die is divided into a front die and a tubular die, and the front die is used for front painting. While the decorative film of is opposed, the decorative film for side surface painting is transferred to the inner surface of the cylindrical mold using the film support in the same manner as above, and the cylindrical mold and the front mold are separated. Assemble the female dies by assembling them, and then perform normal injection molding.
The amount of stretch of the decorative film along the inner peripheral surface of the cavity can be significantly reduced as compared with the case of the conventional method. Therefore, as in the second aspect, the outer surface of the molded body having a relatively deep depth can be formed. In addition to being able to properly paint without causing large distortion or displacement, it is also possible to paint appropriately and accurately on the front surface of the molded body at the same time as the side surface. Different types of decorative films can be used for the front and side surfaces of the molded body, and
It is also possible to give different patterns.

In the injection molding simultaneous painting method according to the fourth aspect of the present invention (claim 6), the decorative film for painting is used in an appropriate manner without using a film support and the inner circumference of the cavity of the female die is appropriately selected. After placing it along the surface,
Since the decorative film is brought into close contact with the inner peripheral surface of the cavity by vacuum suction or the like, and then normal injection molding is performed,
Similarly to the above, the amount of stretching of the decorative film along the inner peripheral surface of the cavity can be made significantly smaller than in the case of using the conventional method, and therefore, as in the case of the above-mentioned third invention, molding with a relatively deep depth. In addition to being able to properly paint on the outer surface of the body without causing large distortion or displacement, it is also possible to paint properly and accurately on the front surface of the molded body at the same time as the side surface. Moreover, different kinds of decorative films can be used for the front surface and the side surface of the molded body, and different patterns can be provided.

[0024]

Embodiments of the injection molding simultaneous painting method according to the present invention will be described in detail below with reference to the accompanying drawings. [Embodiment 1]: FIG. 1 to FIG. 9 In this embodiment, a box-shaped cabinet for a television receiver having a length of 70 cm, a width of 80 cm, a depth of about 15 cm and an opening of 60 cm in length and 70 cm in width on the front side ( (See FIG. 7) was produced by injection molding, and at the same time, its outer surface (of which, the upper surface and the three surfaces of the left and right sides) were painted.

In practice, as shown schematically in FIG. 1, a decorative film 10 wound into a coil and having a width of about 15 cm, and a heating plate 15 as a film support are used. The decorative film 10 has a thickness of 2 here.
A release layer made of acrylic resin on a biaxially stretched PET film having a release treatment of 6μ, a pattern layer made of acrylic resin and vinyl chloride resin / vinyl acetate copolymer resin (grain pattern), and acrylic resin An adhesive layer and a gravure printing method are sequentially printed, and the obtained laminated film is pressed against a 0.5 mm thick ABS sheet with a rubber roller at about 200 ° C., and then the PET film is peeled off. An ABS sheet (laminating sheet) with the obtained pattern is used.

The hot platen 15 is a rectangular parallelepiped having a size (depth) of about 15 cm, which is smaller than the cavity 22 of the female mold 20 described later and has a thickness (depth) of about 15 cm. The outer surface 15a is a heating surface. Although not shown, the hot platen 15 is formed with a large number of vent holes so as to open to the outer side surface 15a, and vacuuming and compressed air supply can be performed through the vent holes ( The structure of the heating plate will be described in more detail later).

On the other hand, the injection molding apparatus used in this embodiment is provided with a female mold 20 and a male mold 30 as shown in FIGS. 3 to 6, which are basically the above-mentioned. Figure 1
It has the same structure as the conventional female mold and male mold shown in FIG. That is, the female die 20 is provided with a cavity 22 that forms a prismatic space corresponding to the outer shape of the molded product (cabinet) to be obtained, and although not shown, the air intake opening to the cavity 22 is provided therein. A hole is provided. Further, the male die 30 has a core portion 32 to be inserted into the cavity 22, and a molten resin pouring hole 34 is provided therein. One of the female die 20 and the male die 30 is moved in the direction toward and away from the other by an advancing and retracting device including a cylinder or the like (not shown).

In order to perform simultaneous injection molding painting using the decorative film 10, hot platen 15, female mold 20, and male mold 30, the decorative film 1 is first prepared as shown in FIG.
0 is temporarily fixed by covering the upper surface and the left and right side surfaces of the outer surface 15a of the hot platen 15 serving as a film support and folding the both ends of the lower surface. This temporary fixing is performed by an appropriate method such as charging the film 10 side or the heating plate 15 side with static electricity, using a transparent adhesive for temporary fixing, and vacuum suction through a ventilation hole provided in the heating plate 15. It The decorative film 10 is not drawn around the lower surface of the outer surface 15a of the hot platen 15 because the lower surface of the molded product (cabinet) to be obtained is a portion that is not visible to the human eye, and thus painting is unnecessary. For that reason.

The step of temporarily fixing the decorative film 10 to the heating plate 15 will be described in detail later with reference to FIG. Next, as described above, the decorative film 10
The hot platen 15 temporarily fixed to is inserted into the cavity 22 of the female die 20 as shown in FIGS. 3 and 4. During this time, the decorative film 10 is heated by a heater built in the heating plate 15 at about 150 ° C. for about 10 seconds to be softened.

Subsequently, as shown in FIG. 4, the female mold 2
In the cavity 22 of 0, the outer surface side of the decorative film 10 is vacuum-sucked through an air intake hole (not shown) provided inside the female mold 20, and compressed air is supplied to the inner surface side of the decorative film 10 through the ventilation hole of the heating plate 15. By doing so, the decorative film 10 is detached from the hot platen 15 and transferred so as to be along the inner surface of the cavity 22.

When the transfer is completed, the hot platen 15 is taken out from the cavity 22 and, as shown in FIG. 6, the female die 20 and the male die 30 are united and the die is clamped.
Injection molding is performed by injecting and filling hot-melt ABS resin into the cavity space formed between the female die 20 and the male die 30. As a result, the decorative film 10 in the female mold 20 is integrated with the injected resin (molded product P) and adhered, and when the mold is opened after completion of injection molding, the decorative film 10 is adhered from the inside of the mold to the outer surface. Further, a molded product (cabinet) Q as shown in FIG. 7 is taken out.

Here, since the decorative film 100 is a laminated laminated sheet (laminate film),
Since the painting is performed as it is, all the layers of the decorative film 10 are adhesively integrated with the outer surface of the molded body S to form a decorative layer. When a transfer sheet is used as the decorative film 10, only the base film of the decorative film integrated on the outer surface of the molded body S is peeled off in a later step,
Painting is completed by leaving a transfer layer such as a pattern layer on the molded body S side to form a decorative layer.

Next, a specific configuration example of the above-mentioned heating plate 15 and a temporary fixing step of the decorative film when using the heating plate 15 will be described in detail. That is, as shown in FIG. 9, the hot platen 15 is provided with a pair of flange-shaped convex walls 17A and 17B on both sides of the outer peripheral surface (heating surface 15a).
A large number of vent holes 18 for supplying compressed air are formed in 5a, and a large number of suction holes 19 for vacuum suction are formed in the peripheral surfaces of the convex walls 17A and 17B, so that the entire heating plate 15 is formed. A shaft 15c fixed to the central portion of the shaft 15c can be rotated about a shaft.

In temporarily fixing the decorative film 10 to the hot platen 15, pressing rollers 41 and 42 arranged below and laterally of the hot platen 15 are used to press or fix the decorative film 10.
With the detachable clamp metal fittings 45 (actually, the metal fittings 45 are provided at the respective corners (eight places) of the support member 15, but only a part thereof is shown in FIG. 9) and the like.
0 is fixed on the convex walls 17A and 17B, and infrared rays are radiated from the heating plate 15 (heating surface 15a) in a state where the heating surface 15a and the decorative film 10 are separated by a certain distance, and / or
It is heated by heat conduction via air between the heating surface.
In this non-contact heating method, even if the heating surface 15a is provided with the ventilation hole 18 for supplying compressed air, the unevenness of the heating surface 15a is not formed on the decorative film 10, so that a thin film makeup such as a transfer film is applied. Particularly effective for films.

Here, in the decorative film 10, the pictures for one molding shot are arranged at a predetermined interval, and as shown in FIG. 9, the vertical positioning marks 52 and the horizontal positioning marks 53 are printed in advance. Therefore, at the time of temporary fixing, the decorative film 10 is sent out while rotating the heating plate 15. At that time, the film support 15
Since the photoelectric tube type sensor 55 for vertical direction detection and the sensor 56 for vertical direction detection are fixed via the support plate 57 and the arm 51, the positioning marks 52, 53 of the sent cosmetic film 10 are fixed. At the time (position) when each sensor 55, 56 reads, the film feed and the rotation of the heating plate 15 are stopped. At that time, makeup film 1
The decorative film 10 can be precisely positioned on the heating plate 15 by setting the pattern of 0 and the heating plate 15 so as to match the desired positional relationship.

If the positioning marks 52, 53 are not captured by the sensors 56, 57, the hot platen 1
When the positioning marks 52 and 53 are captured by rotating and moving in the left-right direction, the rotation / movement is stopped. When the pattern and the heating plate 15 have the above-mentioned positional relationship, the heating plate 15 and the cavity 22 of the female die 20 have a predetermined positional relationship so that the initial position when the heating plate 15 enters the cavity 22 and By setting the facing position of the heating plate 15 with respect to the cavity 22, the pattern of the decorative film 10 and the cavity 22 of the female mold 20 can be aligned in a desired relationship. Of course, when the design of the decorative film 10 is a full-color single-color design that does not require positioning, the above-mentioned operations and steps can be omitted. The positioned decorative film 10 is
After that, it is separated from the winding portion and the temporary fixing is completed.

As described above, in this embodiment,
The decorative film 10 is temporarily fixed to the outer surface of the hot platen 15, and the hot platen 15 is inserted into the cavity 22 of the female die 20, and the decorative film 10 is vacuum sucked or the like in the female die 20 in the cavity 22. Since the transfer is performed so as to follow the inner surface of the cavity 22, the amount of stretching of the decorative film 10 along the inner surface of the cavity 22 can be significantly reduced as compared with the conventional method.

Therefore, it is possible to appropriately paint the outer surface of the molded body S having a relatively deep depth without causing large distortion or displacement. In fact, the obtained molded product Q had little pattern elongation, distortion, and misalignment, and was appropriately and accurately painted as expected. In order to compare and verify the effects of the present embodiment, simultaneous injection molding painting was performed by the conventional method as follows.

[Comparative Example] A decorative film made of the same material as that used in the above-mentioned example and larger than the opening surface of the cavity 22 of the female die 20 is arranged in parallel to the opening side of the cavity 22 of the female die 20, and the decorative film is formed. After preheating at about 150 ° C for about 10 seconds on the heating plate, the decorative film is sandwiched between the heating plate and the parting surface of the female mold and sealed, and compressed air is supplied through the heating plate and vacuum suction is performed through the female mold 30. Then, the decorative film is placed along the inner peripheral surface of the cavity 22, and the female mold 20 and the male mold 30 are united with each other while the hot platen is removed, and the mold is clamped. After that, the normal injection molding is performed. A molded product (cabinet) having a pattern on its outer surface was obtained.

However, in this comparative example, since the decorative film is greatly stretched, the pattern is fully stretched,
There was a large amount of distortion and misalignment. In addition, in this comparative example, the decorative film is also covered on the front opening portion (the portion where the cathode ray tube is fitted) of the molded body, so it is necessary to remove the decorative film in such a portion, which causes a large film loss and is uneconomical. In addition, there is a problem that the finishing process is troublesome.

In the above embodiment, the picture-formed molded product Q having no unevenness on the outer surface is obtained. For example, the female mold 20 has a concave portion on the inner surface of the cavity 22, and the male mold. By providing a slide core or the like to be inserted into the above-mentioned concave portion in 30, it is possible to obtain a picture-formed molded product Q ′ having a convex portion (or concave portion) 16 on the outer surface as shown in FIG.

Further, in the above embodiment, the width of the decorative film 10 is set to be substantially the same as the width (depth) of the outer side surface 15a of the hot platen 15 serving as a film support, but the relationship between the widths is not limited. It is optional. Further, as shown in FIGS. 10 and 11, the corner portion 22a where the front surface and the side surface of the cavity 22 of the female die 20 intersect is rounded (corner having a predetermined radius of curvature) so that the cross section is rounded. The decorative plate 10 is L-shaped and has the same vertical and horizontal dimensions as the front opening of the molded product for which the vertical and horizontal dimensions of the hot platen 15 should be obtained. 9 is inserted into the cavity 22 of the female die 20 as shown in FIG. 9, and thereafter, vacuum suction and compressed air supply are carried out in the same manner as in the above-mentioned embodiment, and as shown in FIG. In other words, in the corner portion 22a of 22,
It can be stretched along the side surface and the front surface, so that proper painting can be performed at the same time as injection molding without causing significant distortion or displacement on both the front surface and the outer surface of the molded body. You can

[Embodiment 2] FIGS. 12 to 14 In this embodiment, the same molded body (cabinet) as in Embodiment 1 described above is to be painted simultaneously on both the outer surface and the front surface by injection molding. The procedure is as follows. That is, first, as shown in FIG. 12, the decorative film is cut into the shape of the developed view corresponding to the shape of the molded body (decorative surface to be painted) to obtain.

Next, the cut decorative film 11
As shown in FIGS. 13 and 14, it is bent along the outer peripheral surface 15a of the heating plate 15 having a three-dimensional shape corresponding to the above-mentioned molded body and temporarily fixed in the same manner as in the first embodiment. Then, while heating and softening the decorative film 11 with the hot platen 15, the hot plate 15 to which the decorative film 11 is temporarily fixed is inserted into the cavity 22 of the female die 20, and thereafter, as in the first embodiment, By vacuum suctioning the outer surface side of the decorative film 11 in the cavity 22 through the intake holes of the female mold 20, and supplying compressed air to the inner surface side of the decorative film 11 through the vent holes of the heating plate 15,
The decorative film 11 is detached from the hot platen 15 and transferred so as to be along the inner surface of the cavity 22.

When the transfer is completed, the hot platen 15 is taken out from the cavity 22, the female mold 20 and the male mold 30 are united and the mold is clamped, and then the female mold 20 and the male mold 30.
Injection molding is performed by injecting and filling molten resin into the cavity space formed between and. As described above, in this embodiment, the decorative film is cut into the shape of the developed view, and the cut decorative film 11 is used as the hot platen 15 serving as a film support.
Since it is bent along the outer peripheral surface 15a and temporarily fixed, the decorative film 11 can be temporarily fixed to the outer periphery of the heating plate 15 without being stretched so much. Since the decorative film 11 is moved along the inner circumferential surface of the cavity 22 of the female die 20 by vacuum suction or the like, the amount of stretching of the decorative film along the inner side surface of the cavity 22 is smaller than that in the conventional method. Can be made significantly smaller. Therefore, the above-mentioned Example 1
In the same manner as described above, in addition to the fact that the outer surface of the molded body P having a relatively deep depth can be appropriately painted without causing a large distortion or displacement, the front surface of the molded body P can also be appropriately painted. You can paint accurately.

[Embodiment 3] FIGS. 15 and 16 In this embodiment, the same molded body (cabinet) as in Embodiment 1 is to be painted simultaneously with injection molding on both the outer surface and the front surface. 15, a front surface mold 23 for forming the front surface of the molded body to be obtained, and the front surface mold 2 for forming the outer side surface of the molded body as shown in FIG.
Female mold 2 provided with a cylindrical mold 24 separable with respect to 3
5 is used and the procedure is as follows.

That is, as shown in FIG. 16, the decorative film 12 for front painting, which has a design pattern consisting of a maker's name and a product name, is placed opposite to the front mold 23, and the cylindrical shape is used. Using the hot platen 15 on the inner surface of the mold 24, the decorative film 10 for side surface painting having a wood pattern is transferred in the same manner as in the first embodiment. afterwards,
The hot platen 15 is taken out from the cylindrical mold 24, and the cylindrical mold 2
4 and the front die 23 are assembled as shown in FIG. 15 to assemble a female die 25, and thereafter, the first and second embodiments are performed.
Similarly, the female die 25 and the male die 30 are united and the die is clamped, and thereafter, normal injection molding is performed.

As described above, in this embodiment, the female die 25 is divided into the front die 23 and the tubular die 24, and the decorative film 12 for front painting is placed opposite to the front die 23. At the same time, the decorative film 13 for side surface painting is transferred to the inner surface of the cylindrical mold 24 using the heating plate 15 in the same manner as in the first embodiment, and the cylindrical mold 24 and the front mold 23 are transferred. Are assembled to assemble the female die 25, and
Since the injection molding is carried out in the same manner as described above, the stretching amount of the decorative film along the inner peripheral surface of the cavity can be significantly reduced as compared with the case of the conventional method, as in Example 2. Therefore, as in the second embodiment, it is possible to appropriately paint the outer surface of the molded body P having a relatively deep depth without causing a large distortion or displacement. Appropriate and appropriate painting can be performed on the front surface of the body P, and different types of decorative films can be used for the front surface and the side surface of the molded body, and different patterns can be imparted. it can.

[Embodiment 4]: FIG. 17, FIG. 18 In this embodiment, as shown in FIG. 17, the decorative film 10 for painting is used as a female mold 20 by an appropriate method without using a film support. It is arranged along the inner peripheral surface of the cavity 22 of, and in the cavity 22 of this female mold 20,
As shown in FIG. 18, the core portion 15A of the hot platen 15 'provided with the collar-shaped portion 15b is inserted, and the decorative film 10 is heated and softened in the cavity 22 of the female die 20, and then the outer surface thereof is formed. The side of the decorative film 10 is vacuum-sucked and, if necessary, compressed air is supplied to the inner surface side of the decorative film 10 through a vent hole (not shown) of the heating plate 15 ′, so that the decorative film 10 is transferred to the female mold 20. The inner peripheral surface of the cavity 22 is brought into close contact with the cavity 22, and then ordinary injection molding is performed.

Even in this case, as in each of the above-described embodiments, the amount of stretch of the decorative film along the inner peripheral surface of the cavity 22 can be made significantly smaller than that in the conventional method. As in each of the above-described embodiments, it is possible to appropriately paint the outer surface of the molded body having a relatively deep depth without causing a large amount of distortion or displacement.

[0051]

As can be understood from the above description, according to the simultaneous injection molding painting method of the present invention, the outer surface of the molded body having a relatively deep depth is not accompanied by a large distortion or displacement. The excellent effect of being able to paint properly can be obtained.

[Brief description of drawings]

FIG. 1 is a diagram showing a decorative film and a heating plate used in Example 1.

FIG. 2 is a diagram which is used for describing a decorative film temporary fixing step in Example 1.

FIG. 3 is a view showing a hot plate on which a female mold and a decorative film used in Example 1 are temporarily fixed.

FIG. 4 is a diagram which is used for describing a decorative film transferring step in Example 1.

FIG. 5 is a view showing a female die and a male die used in Example 1 in a separated manner.

FIG. 6 is a diagram which is used for describing an injection molding process in Example 1.

7 is a view showing a molded article with a picture obtained by the method of Example 1. FIG.

FIG. 8 is a diagram showing another example of a molded article with a picture obtained by the method in Example 1.

FIG. 9 is a diagram provided for explaining a specific example of the heating plate and a temporary fixing process of the first embodiment.

FIG. 10 is a diagram which is used for describing a modified example related to the method of the first embodiment.

FIG. 11 is a diagram which is used for describing a modified example related to the method of the first embodiment.

FIG. 12 is a diagram showing a developed state of a decorative film used in Example 2.

FIG. 13 is a diagram which is used for describing a decorative film temporary fixing step in Example 2.

FIG. 14 is a diagram showing a hot platen to which a decorative film in Example 2 is temporarily fixed.

FIG. 15 is a diagram which is used for describing each member used in Example 3;

FIG. 16 is a diagram showing an injection molding process in Example 3;

FIG. 17 is a diagram showing a female mold and a heating plate of Example 4;

FIG. 18 is a diagram which is used for describing a heating step of Example 4.

FIG. 19 is a diagram which is used for describing a conventional injection molding device.

FIG. 20 is a diagram which is used for describing a preforming step in a conventional simultaneous injection molding painting method.

FIG. 21 is a diagram which is used for describing an injection molding process in a conventional simultaneous injection molding painting method.

[Explanation of symbols]

 10, 11, 12, 13-Cosmetic film 15-Hot plate (film support tool) 20-Female mold 22-Cavity 23-Front mold 24-Cylindrical mold 25-Female mold 30-Male mold 34 -Pouring hole P-Molded body Q-Molded product with picture

Claims (6)

[Claims] 1. A step of temporarily fixing a decorative film for painting on an outer surface of a film support having a three-dimensional shape, and inserting the film support on which the decorative film is temporarily fixed into a cavity of a female mold. And the step of performing vacuum suction on the outer surface side of the decorative film in the cavity, and by performing compressed air supply to the inner surface side of the decorative film through the film support, if necessary, the decorative film A step of detaching the film support from the film support and transferring it along the inner surface of the cavity, and taking out the film support from the cavity,
After combining the female mold and the male mold and performing mold clamping,
A method for simultaneously painting with injection molding, comprising a step of injecting a molten resin into a cavity space formed between a female mold and a male mold to fill the cavity with the resin for injection molding. 2. A step of cutting into a shape of a development drawing corresponding to the shape of a molded body to obtain a decorative film for painting, and a film having a three-dimensional shape corresponding to the molded body, the cut decorative film. A step of temporarily fixing by bending along the outer peripheral surface of the support tool, a step of inserting the film support tool to which the decorative film is temporarily fixed into a cavity of a female mold, and a step of inserting the cosmetic film in the cavity. While vacuum-sucking the outer surface side, if necessary, by supplying compressed air to the inner surface side of the decorative film through the film support tool, the cosmetic film is detached from the film support tool and the cavity inner peripheral surface is removed. And the step of transferring the film support from the inside of the cavity,
After combining the female mold and the male mold and performing mold clamping,
A method for simultaneously painting with injection molding, comprising the steps of injecting and filling a molten resin into a cavity space formed between the female mold and the male mold to perform injection molding. 3. A front mold for forming a front surface of a molded body to be obtained, and an outer surface of the molded body,
A step of preparing a female die provided with a tubular die that is separable from the front die, a step of arranging a decorative film for front painting facing the front die, A step of temporarily fixing the decorative film for painting on the outer surface of the film support having a three-dimensional shape; a step of inserting the film support on which the decorative film is temporarily fixed into the tubular mold; While vacuum-sucking the outer surface side of the decorative film in a tubular mold, by supplying compressed air to the inner surface side of the decorative film through the film support tool as needed, the decorative film is supported by the film. Detaching from the tool and transferring it along the inner surface of the cylindrical mold; removing the film support tool from the cylindrical mold after transferring the decorative film; Type and A step of assembling a female mold by combining the front mold and a female mold and a male mold in which the decorative film for front painting and the decorative film for side painting are left. And mold clamping, and then injection-filling the molten resin into the cavity space formed between the female mold and the male mold to perform injection molding. Painting method. 4. The injection molding simultaneous painting method according to claim 1, wherein a hot plate having a function of heating the temporarily fixed decorative film is used as the film support. 5. A step of temporarily fixing a decorative film for painting on an outer surface of a core part of a male mold, and a male mold and a female mold to which the decorative film is temporarily fixed are united to clamp the mold. The step of performing, while vacuum suctioning the outer surface side of the decorative film in the cavity of the female mold, and by supplying compressed air to the inner surface side of the decorative film through the male mold, if necessary, A step of separating the decorative film from the male mold and transferring it along the inner surface of the cavity of the female mold; and injecting and filling the cavity space between the female mold and the male mold with a molten resin. Injection molding simultaneous painting method including a step of performing injection molding with 6. A step of arranging a decorative film for painting along the inner peripheral surface of the cavity of the female mold, and heating and softening the decorative film in the cavity of the female mold as necessary. With vacuum suction on the outer surface side thereof, and by supplying air under pressure to the inner surface side of the decorative film as necessary, a step of bringing the decorative film into close contact with the inner peripheral surface of the cavity of the female mold, A method for simultaneously painting with injection molding, comprising a step of injecting and filling a molten resin into a cavity space between a mold and a male mold to perform injection molding.