JPH06315950A - Simultaneous injection molding and in-mold decorating method and device thereof - Google Patents

Abstract

PURPOSE:To realize the feeding of decorative film to the position opposite to the surface of a female mold under the state having neither wrinkle nor sagging and the exact positioning of the pattern of the decorating film and the exact fixation of the decorative film to the female mold. CONSTITUTION:After decorative film X is fed under normal temperature to the position opposite to a cavity 2a, the film X is positioned by a film holding- down frame 32. Next, by moving the heating surface of a hot platen to the position opposite to the decorative film X, the decorated film is pressed against a female mold 2 so as to be heated and softened. Thus, the decorative film is brought into close contact with the inner surface of the cavity 2a. Next, after the hot platen is retracted outwards, the female mold 2 is moved toward a male mold so as to close the molds, After that, by injecting molten resin in the cavity, the decorated film X is adhered to the surface of the molded matter.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for painting at the same time as injection molding in which no indentation of a hot plate is left on the surface of a molded product and an apparatus for carrying out this method.

[0002]

2. Description of the Related Art Conventionally, a laminating method and a transfer method have been known as a method for decorating a three-dimensional molded article. In the laminating method, a film on which a pattern is printed is deformed or attached at the same time as the deformation, or a resin is applied to the film in the molding cavity between the male and female molds during or after the film is deformed. Fill. On the other hand, in the transfer printing method, only the pattern ink of the film on which the pattern is printed in advance is transferred to the molded product.

A transfer printing method is disclosed in JP-A-62-196.
The method described in Japanese Patent Publication No. 113 is known. In this method, as will be described later, the heating plate on which the painting film is adsorbed is moved into the space between the male mold and the female mold which are separated from each other by a predetermined distance. Next, the painted film is heated by a hot platen and vacuum-adsorbed on the inner surface of the female mold. Thereafter, the hot platen is retracted outward from the space between the male and female dies. Next, the male mold and the female mold are fastened to each other. Then, a molten resin is injected into the cavity defined by these mold halves to form a molded product, and the painting film is brought into close contact with the surface of the molded resin molded product.

However, in this method, when the decorative film is adsorbed on the hot platen, air is trapped between the hot platen and the decorative film, and the air remains as bubbles. Therefore, the painted film is not heated uniformly. Furthermore, the unevenness or indentation of the vacuum holes of the hot plate remains on the surface of the final molded product to which the picture-painted film is adhered, so that the appearance of the molded product becomes poor.

To solve this problem, Japanese Patent Laid-Open No. 5-3
The method described in Japanese Patent Application No. 01250 (Japanese Patent Application No. 1082771) is proposed. In this method, a rectangular holding frame that contacts the surface of the painting film is provided in a protruding manner on the peripheral edge of the surface of the heating plate, and a recess is formed inside this holding frame. When the hot platen holds the decorative film for heating the decorative film, the presence of the recess prevents the main part of the decorative film from coming into contact with the surface of the hot plate. Indentation remains on the film,
It is possible to prevent the appearance of the molded product from being deteriorated.

[0006]

However, the injection molding simultaneous painting method, however, has the following problems.

That is, when the decorative film is conveyed to the female mold for alignment while holding the decorative film on a hot platen to heat and soften it, wrinkles and slack are generated in the softened decorative film. It is easy, and the alignment with the female mold cannot always be performed accurately due to the softening of the film.

The present invention has been made to solve the above problems, and an object thereof is to feed a painting film to a position opposed to a female mold surface without wrinkles or sagging.
Moreover, it is an object of the present invention to obtain an injection molding simultaneous painting method capable of accurately aligning the design of the painting film with the female mold and fixing the painting film.

Another object of the present invention is to provide a simultaneous injection-molding painting method capable of quickly releasing the fixing of the painting film to the female mold without affecting the taking out of the molded product after the mold is opened. It is in.

Still another object of the present invention is to obtain an injection molding simultaneous painting apparatus which can securely hold and fix the painting film on the female mold.

Another object of the present invention is to provide an injection molding simultaneous painting apparatus capable of reliably pressing the hot platen against the female mold without making the mechanism large.

Still another object of the present invention is to obtain an injection-molding simultaneous painting device which can prevent the heating of the painting film by the hot platen evenly.

Another object of the present invention is to provide an injection molding simultaneous painting apparatus capable of preventing the painting film or the like from being melted and deformed by the hot platen at the standby position.

Still another object of the present invention is to obtain an injection molding simultaneous painting apparatus having an inexpensive means for easily cutting a painting film.

[0015]

According to the present invention, a painting film which is softened by sending the painting film to a position between the opposing male and female dies of the injection molding simultaneous painting device and heating it by a hot platen is provided. Face the cavity of the female mold, then bring the painted film into close contact with the inner surface of the cavity, retract the heating plate from the position between the male mold and the female mold, fasten the male mold and the female mold, and close the cavity. In the simultaneous injection molding painting method, in which molten resin is injected into the molded product to form a molded product, and the painted film is closely adhered to the surface of the molded product, the painted film is spread from the supply section in a strip shape to a position facing the cavity of the female mold. The contact between the male mold and the female mold by holding the painting film in contact with the parting surface of the female mold and holding it at a position different from the space between the male mold and the female mold. Move to a position facing the painting film that is firmly held on the parting surface, and heat the painting film by sandwiching the painting film between the heating plate and the female parting surface via the peripheral holding frame on the surface of the heating plate. There is provided a method characterized by heating and softening with a hot platen while floating from the plate surface.

A simultaneous injection molding painting method according to claim 2 is:
It is characterized in that, after the decorative film is brought into contact with and fixed to the female parting surface, the decorative film is cut in a direction perpendicular to the film feeding direction at a position closer to the decorative film supply portion than the female parting surface.

The injection molding simultaneous painting method according to claim 3 is:
It is characterized in that a film holding frame is fitted into a fitting groove provided on the peripheral portion of the female parting surface via a painting film to firmly hold the painting film in contact with the female parting surface.

The injection molding simultaneous painting method according to claim 4 is:
After injecting the molten resin into the cavity to form a molded product, place the film holding frame fitted in the fitting groove of the female mold parting surface on the paring surface of the male mold so as to face the fitting groove. Move it into the fitting groove provided in the
It is characterized in that the fixing of the painting film to the female mold is released, the male mold and the female mold are opened, and the molded product is taken out.

A simultaneous injection molding painting method according to claim 5 is:
After spreading the painting film from the supply section to a position facing the cavity of the female mold, the painting film is held by a film holding frame provided on the downstream side of the female painting film feeding direction, and then the painting film The painting film is tensioned by applying tension from the side of the supply unit, and then the painting film is firmly held on the female parting surface.

Further, according to the present invention, a male type, a female type,
A conveying means for sending a paint film between the male and female molds and positioning it on the parting surface of the female mold so as to cover the cavity, and a female mold parting so as to heat and soften the paint film on the inner surface of the female mold cavity. In an injection molding simultaneous painting apparatus provided with a hot platen which can be displaced to a position along a surface and means for injecting a molten resin into the clamped male and female cavities, in the peripheral edge of the parting surface of the female mold. A fitting groove is formed, and a film pressing frame is provided so that it can be fitted into the fitting groove in order to fix and hold the painted film sent to a position along the female parting surface,
This film pressing frame is supported by a sliding rod which is opened in the female parting surface and slidable in a hole penetrating the female mold in a direction connecting the male and female molds, and the sliding rod can be driven. There is provided a device characterized by the above.

According to a seventh aspect of the present invention, there is provided a male die, a female die, and a conveying means for sending a painting film between the male die and the male die to position the parting surface of the female die so as to cover the cavity.
A heating plate that can be displaced to a position along the female parting surface so as to heat and soften the painted film on the inner surface of the female mold cavity, and a means for injecting molten resin into the clamped male and female mold cavities In the injection molding simultaneous painting apparatus comprising: a hot plate gripping tool driven in a direction connecting the male and female molds by a driving device is provided on both sides of the female mold. The shape of the hot platen is such that it can be engaged with both sides of the hot platen displaced to a position facing the ring surface, and the hot platen can be pressed against the female die by driving the hot platen gripping tool by the drive device. Is characterized by.

The apparatus according to claim 8 comprises a male die, a female die, and a conveying means for sending a paint film between the male die and the male die so as to cover the cavity on the parting surface of the female die.
A heating plate that can be displaced to a position along the female parting surface so as to heat and soften the painted film on the inner surface of the female mold cavity, and a means for injecting molten resin into the clamped male and female mold cavities In the simultaneous injection-molding painting apparatus including the above, the hot platen is divided into a plurality of blocks, and each block can independently control the amount of heat generation.

According to a ninth aspect of the present invention, there is provided a male die, a female die, and a conveying means for sending a painting film between the male die and the male die to locate the parting surface of the female die so as to cover the cavity.
A heating plate that can be displaced to a position along the female parting surface so as to heat and soften the painted film on the inner surface of the female mold cavity, and a means for injecting molten resin into the clamped male and female mold cavities In the simultaneous injection-molding painting apparatus including the above, the hot platen has a standby position retracted from the region between the male mold and the female mold, and a heat shield plate that covers the heating surface of the hot platen is provided at the standby position. It is characterized by

According to a tenth aspect of the present invention, there is provided a male die, a female die, and a conveying means for sending a painting film between the male die and the male die to position the casting die on the parting surface of the female die so as to cover the cavity, and the painting film. A hot platen that can be displaced to a position along the female parting surface so as to heat and soften the inner surface of the female mold cavity when it comes into close contact, and means for injecting the molten resin into the clamped male and female mold cavities. In the injection molding simultaneous painting apparatus provided with, when the hot platen is at a position where it is pressed against the female parting surface, the female painting film is supplied from the female parting surface to the painting film supply section. It is characterized in that it has a heating filament for cutting at the side position.

[0025]

According to the method of claim 1, since the painting film is stretched on the parting surface of the female mold at room temperature while being hard and not easily deformed, it is possible to obtain a state in which wrinkles, slack and deformation are unlikely to occur during feeding. .

In the method of the second aspect, the decorative film that is properly aligned with the female mold is cut on the side close to the film supply section, and the effect of the decorative film heated and molded on the female mold parting surface is affected. It does not reach the painted film in contact with the female mold.

In the method of the third aspect, the decorative film is fixedly positioned and held by the film pressing frame in the fitting groove of the female parting surface.

According to the method of claim 4, after molding the molded article,
The film holding frame in the fitting groove of the female parting surface is immediately moved into the facing male fitting groove to release the fixation of the film with the picture, and the mold is opened without being disturbed by the film holding frame. Be done.

According to the method of claim 5, after sending the film with paint to the female mold, the film is restrained at the lower end of the female mold, and then the film is tensioned by the tension from the film supply section side to remove wrinkles, slacks and the like. It

In the apparatus of claim 6, the film pressing frame is pressed against the female mold in such a manner that it is embraced from the female mold side through the sliding rod provided in the female mold itself, and the mechanism is easy to press. Done

In the apparatus according to the seventh aspect, the hot platen is pressed against the female parting surface from the female mold side by the hot platen gripping tool, and the pressing action becomes reliable.

In the apparatus of claim 8, the heat of the heating plate is uniform over the entire heating surface.

In the apparatus according to the ninth aspect, the heat shield plate blocks the radiant heat from the heat plate at the standby position to prevent fusing of the painting film.

In the apparatus according to the tenth aspect, when the heating platen is pressed against the female parting surface, the painting film is automatically melted by the heating filament on the side of the film supply device.

[0035]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows the overall schematic construction of an embodiment of an apparatus for simultaneously painting injection molded articles. In the figure, reference numeral 1 is a male mold of a molding apparatus, and this male mold 1 is fixed to a stationary platen 3. The male die 1 is arranged to face the female die 2. The male die 1 is arranged to face the female die 2. An injection nozzle 5 is provided in the male mold 1 so as to communicate with the injection gate 4.
The female die 2 is fixed to a ram 7 via a movable plate 6. Due to the forward / backward movement of the ram 7, the female die 2 is moved forward and backward with respect to the male die 1. Further, the female mold 2 is provided with an exhaust hole 8 through which the air in the female mold 2 is discharged to the outside by a vacuum pump (not shown). A rectangular fitting groove 1a is formed on the parting surface of the male die 1, and a rectangular fitting groove 2 is formed on the parting surface of the female die 2 so as to face the fitting groove 1a.
b is formed.

A hot platen 9 is arranged at a position separated from the outer surfaces of the male mold 1 and the female mold 2 (a space area between the molds) by a predetermined distance. The position where the hot platen 9 is arranged is hereinafter referred to as a standby position. On the other hand, the position where the male die 1 and the female die 2 are arranged so as to face each other and the hot platen 9 is moved therebetween is hereinafter referred to as the forward position. Hot platen 9
Can be moved between the standby position and the forward position by a driving means (not shown).

X is a paint film, and this paint film X is pulled out from the roll R in the direction of the arrow by the chuck devices 34 and 34 'and is fed to a position facing the female mold 2 as described later. There is.

2 and 3 show the details of the heating platen 9.

The heating plate 9 includes a heating plate 10, a liner plate 11,
It has a laminated structure in which the heater panel 12 and the insulating plate 13 are arranged in this order. The heating plate 10 heats the painting film X as described later. A rectangular holding frame 14 is fixed to the peripheral portion of the front surface of the heating plate 10. This holding frame 14 is one of the important components of the present invention. The hot platen 9 is attached to the support member 15 so as to be moved by the solenoid 16. Solenoid 16
The hot platen 9 is moved in a direction perpendicular to the surface of the film X with the painting. The solenoid 16 advances and retracts the hot platen 9 to the female mold 2 as described later.

The heating plate 10 of the heating plate 9 is made of metal having excellent heat conductivity. The heating plate 10 is the peripheral wall 14a of the holding frame 14.
A large number of small air blowing holes 17 are arranged at a predetermined pitch in a region surrounded by. These air blowing holes 17 penetrate from the front side surface to the rear side surface of the heating plate 10. As shown in FIG. 5, the heating plate 10 and the peripheral wall 14 a of the holding frame 14 form a recess 14 b. When the ceramic layer is formed on the front side surface of the heating plate 10, the radiation heat efficiency is improved. The liner plate 11 disposed behind the heating plate 10 is made of a metal plate having high heat transfer characteristics. The liner plate 11 has a surface that contacts the rear surface of the heating plate 10. A groove 18 is provided on this surface, and compressed air is sent to the air blowing hole 17 through this groove. A vent hole 19 is provided at the center of the liner plate 11. The vent hole 19 penetrates the liner plate 11. The vent hole 19 passes through the centers of the heater panel 12 and the insulating plate 13. The vent hole 19 is opened to the rear side surface of the insulating plate 13, and the opening of the vent hole 19 is connected to the air hose 20. The air hose 20 can be connected to a low pressure compressor 22 or a high pressure compressor 23 through a three-way switching valve 21.

The heater panel 12 includes a plurality of heating wires 24. These heating wires are connected to a power supply line (not shown). The insulating plate 13 has a function of effectively transmitting the heat generated by the heating wire 24 toward the heating plate 10.

As shown in FIGS. 3 and 4 (enlarged view of the portion indicated by reference numeral 4 in FIG. 2), the sealing ring fitting groove 25 is formed along the peripheral wall 14a of the holding frame 14. When the sealing ring 26 is fitted in the groove 25, air leakage is prevented. Further, during the vacuum forming operation, the deviation of the painting film from a predetermined position is prevented.

As shown in FIG. 1, film holding means 31 is provided at the standby position of the heating platen 9. The film pressing means 31 has a rectangular film pressing frame 32 (shown in FIG. 6). Holding frame 32
Operates so as to hold the painting film X completely in a non-contact state as described later. The film pressing means 31 has the chuck device 34 and the cutter device 35. The cutter device 35 cuts the painted film X pulled to a predetermined position. The cutter device 35 is driven by an air cylinder 36.

The picture-bearing film X is initially in the form of a band on which a specific pattern Y (see FIG. 3) is printed at predetermined intervals. This picture-bearing film X is wound in a roll R shape and held by the supply holding device S (FIG. 1). In one embodiment of the “laminate film” for the painted film X, a product obtained by printing a pattern on a thermoplastic resin such as an acrylic resin, acrylonitrile-butadiene-styrene copolymer (ABS) or polyvinyl chloride can be used. .

As an example of the transfer printing film,
It is possible to use a laminate in which a transfer printing layer comprising a transfer protection layer, a pattern layer and an adhesive layer is formed on a peelable substrate such as a biaxially stretched polyethylene terephthalate resin or propylene.

From the viewpoint of the three-dimensional contour following characteristics (molding characteristics) required in the injection molding simultaneous painting method, and from the viewpoint of the durability of the pattern surface (abrasion resistance, etc.), "dilution" is applied to the painting film base material or the transfer layer. It is possible to use a "resin which becomes a non-adhesive thermoplastic solid even in a non-crosslinked state after drying the medium". Such resins are described in JP-A-61-69487 and JP-A-60-161121. Examples of the base material of the laminate film or the transparent protective layer of the transfer film include a glass transition temperature of 0 ° C to 250 ° C.
It is a material formed by adding a polymerizable cross-linking radical such as an acrylic group and a methacrylic group to a non-adhesive thermoplastic copolymer such as an acrylic resin at ℃.

The material before polymerization or before the crosslinking reaction is transferred or laminated onto the surface of the injection resin molded product. The resulting laminate is then cured by a crosslinking reaction using UV or electron beam.

Next, the operation of the simultaneous injection-molding painting device will be described with reference to FIGS. First, from the state of FIG. 1, the chuck device 34 grasps the end of the painting film X and pulls it between the male mold 1 and the female mold 2 as shown in FIG. Cover the whole. Also, the film pressing frame 32
1 is moved from the standby position of FIG. 1 outside the area of the male mold 1 and the female mold 2 to the position of FIG. Then, the position of the pressing frame 32 is adjusted so as to coincide with the fitting groove 2b on the facing surface of the female die 2. The fitting groove 2b is arranged so as to surround the surface of the cavity 2a.

Next, as shown in FIG. 8, the film pressing frame 32 is pushed into the fitting groove 2b with the picture film X interposed therebetween. In this way, the painted film X is brought into contact with the parting surface of the female die 2.
At this point, it is preferable that the outer surface of the film pressing frame 32 is at the same level as the outer surface of the female mold 2 after the fitting. However, as shown in the figure, when a fitting groove 1a is formed in the outer peripheral portion of the male die 1 and the fitting groove faces the fitting groove 2b of the female die 2, the outer surface of the film pressing frame 32 is made into a female die. It does not have to be at the same level as the outer surface of 2.
Rather, it is preferable that the film pressing frame 32 projects so that the peripheral wall 14a of the holding frame 14 is easily pressed, as will be described later. FIG. 9 shows the front surface of the female mold 2 as seen from the left side of FIG. As shown in the figure, the film pressing frame 32 has a connecting portion 32 which is connected to the driving source on the side thereof.
a.

Next, as shown in FIG. 10, the hot platen 9 at the standby position is moved to the front surface of the female die 2. Next, the picture-attached film X is inserted by the peripheral wall 14 a of the holding frame 14 on the heating plate 9 via the film pressing frame 32.
It is pushed into b. At this stage, the painted film X is brought into contact with the peripheral wall 14 a on the heating plate 9. In this way, a closed heating space is formed, and the painted film X is heated in a non-contact state. After the painting film X is sufficiently softened, it is subjected to vacuum suction through the exhaust hole 8 as shown in FIG. At this time, if necessary, the air outlet 17
Blow-off air may be used together. As a result, the painted film X is matched with the shape of the cavity surface 2a.

Thereafter, as shown in FIG. 12, the heating platen 9 is retracted to the standby position. Next, the female mold 2 and the male mold 1 are fastened to each other. Then, the molten resin is injected from the injection gate 4 and the cavity is filled with this resin.

After the molten resin is cooled and solidified as shown in FIG. 13, the male die 1 and the female die 2 are opened, and then the film pressing frame 32 is pulled out from the fitting groove 2b of the female die 2. In this way, the resin molded product fixed to the painted film X is taken out. When the painting film X is a transfer printing film, only the base film is peeled off and the pattern is left on the molded product.

In another method of opening the mold, after the molten resin is cooled and solidified as shown in FIG. 14, the film pressing frame 32 is changed from the fitting groove 2b of the female mold 2 to the fitting groove of the male mold 1. Moved into 1a. After the picture film X is released, the mold opening operation shown in FIG. 13 is performed. According to this method, it is easy to release the molded product from the male mold 1 and the female mold 2.

The effect of the above-mentioned embodiment is that the picture film X is heated and softened in a state where it is directly fixed on the opposing surface of the female mold, so that the picture film X is hardly deformed or moved. . Especially when the pattern is positionally matched with the mold, a high degree of positional accuracy is easily obtained. When positioning the pattern and the mold irregularities with high accuracy, a positioning mark such as a cross shape is printed on the painted film X, and this is detected by a position sensor such as a photoelectric tube fixed to the molding machine,
The feeding of the painted film X is stopped.

Although the transfer printing method has been described in the above embodiment, the present invention can be applied to the laminating method.

In the above-mentioned embodiment, a panel heater which radiates near infrared rays can be used. In addition to this heater, an electric heater (a nichrome coil is used, and Joule radiant heat such as surface resistance is directly painted). Heater for radiating film X), ceramic panel for radiating far infrared rays,
Alternatively, dielectric heating can be used. Further, as an example of the thermal transfer method for the painted film X, infrared radiation, electromagnetic waves, etc. can be used directly. Furthermore, it is also possible to heat the air in the closed space to perform thermal transfer to the painting film X. Of course, both can be used together.

15 to 19 show a second embodiment of the present invention. In this embodiment, the film pressing frame 3
The driving method of No. 2 is improved. Sliding rods 36 are integrally fixed to the film pressing frame 32 as shown in FIGS. 15 and 16, and these sliding rods 36 are female type. 2 and the movable plate 6 are passed through in the operating direction of the ram 7, and are connected to a reciprocating operation mechanism (not shown) behind the ram 7. Further, as shown in FIG. 15, a film fixing pressing frame 38 is provided at the lower part of the female mold 2 adjacent to the parting surface thereof so as to be movable back and forth. This holding frame 38
Is a plate material that is parallel to the lower side of the rectangular holding frame 32, and behind the both ends thereof, an operating rod 39 having a gap wider than the lateral width of the film X is fixed.
Reference numeral 9 constitutes an output shaft of the reciprocating drive source 40. On the other hand, on the downstream side of the roll R of the film supported by the supply holding device S, a pair of forward and reverse feed rolls 42 is provided.
At the time of the normal rotation, the picture film X is fed in the direction of the female die 2,
At the time of reverse rotation, the picture film X can be fed backward toward the roll R.

In this embodiment, the cavity 2a of the female mold 2 is
The exhaust port is composed of small holes distributed over the entire inner surface as shown by 8a, and the intake air from these small holes 8a is sucked to the outside through the exhaust passage 8. Further, as shown in FIG. 15, a heat shield plate 43 made of a heat insulating material is provided on the front surface of the heat plate 9 so as to be movable by a drive device 44.

In this embodiment, in order to obtain a state corresponding to the state of FIG. 7 of the previous embodiment, the feed roll 4 in the state of FIG.
2 is rotated in the normal direction and the chuck device 34 is operated to lower the painted film X to a position where it covers the parting surface of the female die 2 as shown in FIG. by this,
The lower end of the painted film X comes to a position inside the film fixing press frame 38. However, in this state, the painting film X is slightly fed by inertia, so that
As shown in 7, slack and wrinkles remain. In this state,
As shown in FIG. 18, the drive source 40 is actuated to retract the film pressing frame 38, press and fix the leading end of the picture-bearing film X, and at the same time, the feed roll 42 is reversed. As a result, tension acts on the film X, and the slack and wrinkles of the film X are removed. Subsequently, the sliding rod 36 is retracted as shown in FIG. 19, whereby the film pressing frame 32 is pushed into the fitting groove 2b of the female die 2. Therefore, the paint film X also enters the fitting groove 2b and is fixed at a predetermined position. This state corresponds to the state shown in FIG.

Subsequent steps are the same as those in FIGS. 10 to 14, and the injection-molded molded product is taken out of the mold. In this embodiment, the radiant heat from the hot platen 9 is not formed by arranging the heat shield plate 43 so as to face the heating side of the front surface of the hot platen 9 at the standby position shown in FIG. It is possible to prevent unnecessary heating of the painting film, the molding apparatus and the like, which may cause melting and deformation of the painting film, and the inconvenience such as fire.

Next, a third embodiment of the present invention will be described with reference to FIGS. 20 and 21.
FIG. 3 is a cross-sectional view of the device of the present invention as seen from above.
In this embodiment, as shown in FIGS. 20 and 22, hot platen grippers 50 are provided so as to be movable back and forth along both side surfaces of the female die 2 and the movable platen 6. In the illustrated example, the hot platen holding tool 50
Are provided in two pairs on the left and right, and each heating plate gripping tool 50 is U-shaped. The U-shaped hot plate gripper 50 is a film with a picture X
Is opened to the side through which the drive rod 53 is passed, and is displaceable in the longitudinal direction of the drive rod 53 via the drive rod 53 by a drive device 52 such as an air cylinder.

As shown in FIG. 20, the painting film X is fed so as to cover the parting surface of the female die 2, and then the film holding frame 32 is pushed into the fitting groove 2b of the female die 2 to provide the painting film. After X is fixed in the same state as in FIG. 8, the hot platen 9 is moved to the forward position facing the female mold 2. At this time, the hot platen holding tool 50 is
In the position shown in FIG. 20, the hot platen 9 slides into the hot plate gripping tool 50 from above via the position of FIG. 22 as shown in FIG. For this purpose, the hot platen gripping tools 50 facing left and right are set apart from each other by a distance that can hold both side edges of the hot platen 9, and each U-shaped hot platen gripping tool 50 is slidable on the hot platen 9. It is configured to have a receiving inner width.

In the state shown in FIG. 20, the hot platen holder 50 is in the position displaced leftward (in the male die direction) in the drawing by the driving device 52, so that the hot platen 9 is separated from the female die 2. In this state, the drive device 52 moves the drive rod 53 to the right as shown by the arrow in FIG. by this,
The hot platen 9 supported by the hot platen gripping tool 50 is displaced to the right, and the holding frame 14 on the front surface thereof abuts on the film pressing frame 32. Then, when gas is exhausted from the exhaust hole 8, the picture film X stretched over the opening of the cavity 2a is adsorbed on the inner surface of the cavity 2a, and the state shown in FIG. 21 is obtained. Since the subsequent steps are the same as those described above, the description thereof will be omitted.

In this embodiment, the pressing of the heating plate against the female mold is
Since the hot platen is held by the female platen holding tool, the hot platen, the painted film and the female plate are firmly adhered to each other, and compressed air is blown from the hot platen 9 during vacuum forming. However, the hot platen does not come off or come off from the female mold due to air pressure. Further, the driving mechanism does not need to be large-scale as compared with the case where the hot platen is pressed against the female mold by the external driving mechanism separated from the mold.

23 and 24 show a fourth embodiment of the present invention. In this embodiment, a pair of L-shaped support tools 60, 60 are provided on both sides of the upper surface of the heating plate 9 so as to project in a direction toward the female mold 2, and heating wire strips are provided between the tips of these support tools. 6
2. A heating wire such as a nichrome wire is stretched. As a result, as shown in FIG.
When the decorative film X fixed to the parting surface is pressed close to the decorative film X, the heating filament 62 contacts the decorative film X and separates one shot of the decorative film and the subsequent decorative film portion by fusing. This fusing method is simpler and cheaper than cutting the painted film with a mechanically driven blade.

In the modified embodiment of the present invention shown in FIGS. 25 and 26, the heating plate 9 is divided into heating plate blocks 9A, 9B and 9C from the upper side to the lower side. In this embodiment, it is divided into three blocks, but the number of divisions is arbitrary. Then, heating wires 24A, 24B, 24C that can be individually controlled are embedded in the blocks 9A, 9B, 9C,
Moreover, temperature sensors 70A, 70B, and 70C are inserted in each block.

When the heater wire is embedded so that the surface temperature of the heating plate becomes uniform, the temperature of the heating plate in the vertical direction tends to increase as it goes up, and the temperature of the heated painting film X also tends to increase as it goes up. . However, when the hot platen is divided into a plurality of blocks in the vertical direction as in this embodiment and the temperature is controlled by the sensor for each block, the temperature distribution of the painting film can be prevented from being nonuniform. The temperature control follows a known technique. In the case of heating wire, the amount of heat generation is controlled by thyristor,
It is performed by a known method such as bimetal.

[0068]

According to the first aspect of the present invention, since the main part of the painting film is heated without coming into contact with the surface of the heating plate,
The indentation on the surface of the hot platen does not remain on the painting film, and the quality of the molded product is improved.Because the painting film spreads on the female cavity surface at room temperature, it is hard to deform before heating, so the painting film Wrinkles, sagging, and deformation are less likely to occur, and the accuracy of alignment between the female die and the picture sheet design is improved.

According to the second aspect of the present invention, since the painting film is separated from the film supply side while the painting film is firmly held in the female mold, the influence of the molding operation, such as deformation of the painting film, stress generation, etc., is not formed on the downstream side. It does not extend to the painted sheet.

According to the third aspect of the present invention, the decorative film is securely fixed and held on the female mold, and deformation and displacement of the decorative film are unlikely to occur during molding or cutting of the decorative film.

According to the fourth aspect of the present invention, the fixing and holding of the decorative film on the female mold is ensured, and the fixing of the decorative film and the molded product can be easily and quickly released when the mold is opened, and the decorative film is integrated with the decorative film. It is possible to release the molded product that has been turned into a mold.

According to the invention of claim 5, the tension is applied to the painting film after the painting film is sent to the female mold, so that the slack, wrinkles and deformation caused by the feeding inertia of the painting film are removed, and It is ideal to hold it in the female mold.

According to the sixth aspect of the invention, the function of pressing and holding the decorative film sent to the female mold to the female mold is surely performed, and the positioning of the decorative film with respect to the female mold can be accurately performed. Since the film holding frame is held by the film holding frame which is moved by the guide of the sliding rod penetrating the female die, the film holding frame is moved between the male and female die and the standby position outside thereof. Space is no longer needed and space can be used effectively.

According to the seventh aspect of the invention, by using the hot plate gripping tool for holding the hot plate so as to embrace the hot plate from the female side, the close contact between the hot plate, the painting film and the female mold becomes strong, and the hot plate is held. Even if compressed air is blown from the hot platen, the hot platen does not come off from the female mold and the mechanism can be made smaller and less expensive than the case where a pressing force is applied to the hot platen by an external mechanism.

According to the eighth aspect of the present invention, by controlling the heat generation amount of each of the plurality of blocks of the hot platen, it is possible to eliminate the tendency that the hot platen becomes hotter toward the upper side, and to obtain a uniform temperature distribution.

According to the ninth aspect of the present invention, it is possible to prevent the radiant heat from the hot platen at the standby position from reaching the unformed film, the molding apparatus, etc. by the heat shield plate, and the melting and deformation of the film is prevented. It is possible to prevent and prevent fire.

According to the tenth aspect of the present invention, the effect that the hot platen is pressed by the female die can be used to automatically separate the painting film from the downstream side thereof, and the structure is simple and inexpensive. can get.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing a part of an embodiment of an injection molding simultaneous painting apparatus of the present invention in cross section.

FIG. 2 is a partial cross-sectional view of the hot platen of the above embodiment.

FIG. 3 is a front view of a hot platen.

FIG. 4 is an enlarged cross-sectional view showing a heating plate and a holding frame.

FIG. 5 is a view showing a hot platen and a film pressing unit.

FIG. 6 is a perspective view of a film pressing frame used in the present invention.

FIG. 7 is a diagram showing one stage of the operation of the embodiment of FIG.

FIG. 8 is an explanatory diagram of the next operating state of FIG. 7.

9 is a left side view of the female die shown in FIG.

FIG. 10 is an explanatory view of the next operating state of FIG.

FIG. 11 is an explanatory diagram of the next operating state of FIG.

FIG. 12 is an explanatory diagram of the next operational state of FIG. 11.

FIG. 13 is an explanatory diagram of the next operating state of FIG. 12.

FIG. 14 is an explanatory diagram of the next operational state of FIG. 13.

FIG. 15 is a configuration diagram of a second embodiment of the present invention.

16 is a perspective view of the female die shown in FIG.

FIG. 17 is an explanatory view showing one operation stage of the second embodiment.

FIG. 18 is an explanatory view showing the next operation stage of the second embodiment.

FIG. 19 is an explanatory view showing the next operation stage of the second embodiment.

FIG. 20 is a cross-sectional view showing the configuration of the main parts of the third embodiment of the present invention.

FIG. 21 is a view showing a different operating state of the embodiment of FIG. 20.

22 is a perspective view of the embodiment of FIG. 20.

FIG. 23 is a perspective view of a main part showing a fourth embodiment of the present invention.

FIG. 24 is a side view showing a fused state of a picture-added film according to a fourth embodiment.

FIG. 25 is a side view showing a modification of the heating plate.

FIG. 26 is a cross-sectional view of the heating platen of FIG. 25.

[Explanation of symbols]

 1 Male 1a Fitting Groove 2 Female 2a Cavity Inner Side 2b Fitting Groove 7 Ram 8 Exhaust Hole 9 Hot Plate 9A, 9B, 9C Hot Plate Block 10 Heating Plate 14 Holding Frame 14a Holding Frame 14a Recess 16b Recess 16 Solenoid 17 Air Blow-out hole 18 Groove 19 Air passage 21, 29 Three-way switching valve 22 Low-pressure air source 23 High-pressure air source 24 Heater wire 32 Film holding frame 34 Chuck 35 Cutter 36 Sliding rod 38 Film holding frame 42 Feed roll 43 Heat shield 50 Heat Board gripping tool 52 Drive device 53 Drive rod 60 Support tool 62 Heating wire X Painted film

Front page continuation (72) Inventor Takashi Tarutani To 1-1 Ichigaya Kagacho, Shinjuku-ku, Tokyo Within Dai Nippon Printing Co., Ltd. No. 1-1 Dai Nippon Printing Co., Ltd. (72) Inventor Kazuhisa Kobayashi 1-1-1 Ichigaya-Kagacho, Shinjuku-ku, Tokyo Dai Nippon Printing Co., Ltd. (72) Inventor Hiroyuki Atake Shinjuku, Tokyo 1-1-1 Ichigaya, Ichiya-ku, Dai-ni Printing Co., Ltd.

Claims (10)

[Claims] 1. A painting film is sent to a position between opposing male and female dies of an injection molding simultaneous painting device, and a painting film softened by heating by a heating plate is made to face a cavity of the female die, and then painting is performed. The film is brought into close contact with the inner surface of the cavity, and the heating plate is retracted from the position between the male mold and the female mold,
In the injection simultaneous painting method in which the male mold and the female mold are fastened, the cavity is closed, the molten resin is injected into the cavity to mold the molded product and the painted film is adhered to the surface of the molded product. To a position facing the cavity of the female mold, and the pictured film is firmly held in contact with the parting surface of the female mold, and kept waiting at a position different from the space area between the male mold and the female mold. The hot platen was moved to a position between the male mold and the female mold, facing the painting film fixed on the parting surface of the female mold, and the hot platen and the female mold party were placed via the peripheral holding frame on the surface of the hot platen. A method in which a painting film is sandwiched between the heating surface and the heating surface, and the painting film is heated and softened by the heating platen while floating from the surface of the heating platen. 2. The injection molding simultaneous painting method according to claim 1, wherein the painting film is brought into contact with and fixed to the female parting surface, and then the painting film is placed at a position closer to the painting film supply portion than the female parting surface. A method characterized by cutting in a direction perpendicular to the film feeding direction. 3. The simultaneous injection-molding painting method according to claim 1, wherein a film holding frame is fitted through a painting film into a fitting groove provided at a peripheral portion of the female parting surface to paint the painting. A method comprising contacting and holding a film on a female parting surface. 4. The injection molding simultaneous painting method according to claim 3, wherein after the molten resin is injected into the cavity to form a molded product, the film is fitted into the fitting groove of the female parting surface. The holding frame is moved into the fitting groove provided on the paring surface of the male mold so as to face the above-mentioned fitting groove, and the fixing of the film with the female mold is released, and the male mold and the female mold are opened and molded. A method characterized by taking out goods. 5. The simultaneous injection-molding painting method according to claim 1, wherein the painting film is spread from the supply portion to a position facing the cavity of the female mold, and then provided on the downstream side in the feeding direction of the female painting film. Gripping the painting film with the film holding frame, and then tensioning the painting film by applying tension to the painting film from the side of the supply unit,
After that, the method is characterized by holding the painted film on the female parting surface. 6. A male die, a female die, and a conveying means for sending a painting film between the male die and the male die to locate the parting surface of the female die so as to cover the cavity, and the painting film on the inner surface of the female die cavity. Injection molding simultaneous painting with a hot platen that can be displaced to a position along the female parting surface so that it will heat and soften when adhered to, and means for injecting molten resin into the clamped male and female cavities In the device, a fitting groove is formed on the periphery of the parting surface of the female die,
A film holding frame is provided so that it can be fitted into the fitting groove in order to fix and hold the painted film sent to the position along the female parting surface. The film holding frame is opened on the female parting surface. An apparatus characterized in that the female die is supported by a sliding rod slidable in a hole penetrating in a direction connecting the male and female dies, and the sliding rod can be driven. 7. A male die, a female die, and a conveying means for sending a paint film between the male die and the male die so as to cover the cavity on the parting surface of the female die, and the painting film on the inner surface of the female die cavity. Injection molding simultaneous painting with a hot platen that can be displaced to a position along the female parting surface so that it will heat and soften when adhered to, and means for injecting molten resin into the clamped male and female cavities In the apparatus, a hot platen gripping tool driven by a drive device in a direction connecting the male and female molds is provided on both sides of the female mold, and the hot platen gripping tool is located at a position facing the female parting surface. An apparatus having a shape capable of engaging with both sides of the displaced heating platen, wherein the heating platen can be pressed against the female mold by driving the heating platen holding tool by the driving device. 8. A male die, a female die, and a conveying means for sending a painting film between the male die and the male die to locate the parting surface of the female die so as to cover the cavity, and the painting film on the inner surface of the female die cavity. Injection molding simultaneous painting with a hot platen that can be displaced to a position along the female parting surface so that it will heat and soften when adhered to, and means for injecting molten resin into the clamped male and female cavities In the apparatus, the hot platen is divided into a plurality of blocks, and each block can independently control the amount of heat generation. 9. A male die, a female die, and a conveying means for sending a painting film between the male die and the male die to locate the parting surface of the female die so as to cover the cavity, and the painting film on the inner surface of the female die cavity. Injection molding simultaneous painting with a hot platen that can be displaced to a position along the female parting surface so that it will heat and soften when adhered to, and means for injecting molten resin into the clamped male and female cavities In the apparatus, the heating plate has a standby position retracted from a region between a male mold and a female mold, and a heat shield plate for covering a heating surface of the heating plate is provided at the standby position. apparatus. 10. A male die, a female die, and a conveying means for sending a painting film between the male die and the male die to locate the parting surface of the female die so as to cover the cavity, and the painting film on the inner surface of the female die cavity. A heating plate that can be displaced to a position along the female parting surface so that it heats and softens when adhered to
In an injection molding simultaneous painting apparatus comprising means for injecting a molten resin into the fastened male and female cavities, when the hot platen is at a position where it is pressed against the female parting surface, the female An apparatus comprising a heating filament for cutting a decorative film continuing from the mold parting surface to the decorative film supply unit at a position on the side of the female decorative film supply unit.