JP3043682B2 - Injection molding simultaneous painting equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for painting on the surface of a molded article simultaneously with injection molding.

[0002]

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

A transfer printing apparatus is disclosed in Japanese Patent Application Laid-Open No. 62-19 / 1987.
The device described in US Pat. In this apparatus, as described later, a hot plate on which a picture film is adsorbed is moved into a space between a male mold and a female mold which are separated from each other at a predetermined interval. Next, the painting film is heated by a hot plate and is vacuum-sucked to the inner surface of the female mold. Thereafter, the hotplate is retracted outward from the space between the male and female molds. Next, the male mold and the female mold are fastened to each other. Then, the molten resin is injected into the cavity defined by these halves to form a molded product, and the painted film is adhered to the surface of the molded resin molded product.

However, in this apparatus, when the painted film is adsorbed on the hot platen, air is trapped between the hot platen and the painted film, and this air remains as air bubbles. Therefore, the painted film is not heated uniformly. In addition, the unevenness or indentation of the vacuum hole of the hot plate remains on the surface of the final molded product to which the painting film is adhered, so that the appearance of the molded product becomes poor.

In order to solve this problem, Japanese Patent Laid-Open No. 5-3 is disclosed.
An apparatus described in Japanese Patent Application No. 01250 (Japanese Patent Application No. 4-108271) has been proposed. In this apparatus, a rectangular holding frame that comes into contact with the surface of the painting film is protruded from a peripheral portion of the surface of the hot plate, and a concave portion is formed inside the holding frame. Then, when the hot platen holds the painting film for heating the painting film, the presence of the concave portion prevents the main part of the painting film from coming into contact with the surface of the heating plate. Indentations remain on the film,
Deterioration of the appearance of the molded article is avoided.

[0006]

However, the above-described simultaneous injection molding painting apparatus has the following problems. That is, it is difficult to accurately and reliably perform the operation of transporting the picture film to the female mold, performing positioning, and holding the picture film on the parting surface of the female mold.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a simultaneous injection-molding and painting apparatus capable of accurately aligning a picture of a painting film with a female mold and fixing the painting film. Is to get

[0008]

According to the present invention, there is provided a conveying method in which a picture film is fed between a male mold, a female mold, and both male and female molds and positioned on a parting surface of the female mold so as to cover the cavity. Means, a hot plate that can be displaced to a position along the female parting surface so as to be heated and softened when the painted film is brought into close contact with the inner surface of the female cavity, and a molten resin in the male and female cavities that are fastened. Injection molding simultaneous painting apparatus comprising means for injecting, wherein a fitting groove is formed on the periphery of the female parting surface, and in order to fix and hold the painting film sent to a position along the female parting surface. A film holding frame is provided so as to be fitted into the fitting groove, and the film holding frame is slidable in a hole that opens in the female parting surface and penetrates the female mold in the direction connecting the male and female molds. It is supported by the dynamic rod, and wherein the sliding rod can be driven in the longitudinal direction is provided.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows an overall schematic configuration of an embodiment of an apparatus for simultaneously painting a molded article to be injection-molded. In the figure, reference numeral 1 denotes a male mold of a molding apparatus, and the male mold 1 is fixed to a fixed platen 3. The male mold 1 is arranged to face the female mold 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. The female mold 2 is moved forward and backward with respect to the male mold 1 by the reciprocating operation of the ram 7. Further, the female mold 2 has an exhaust hole 8 through which air in the female mold 2 is exhausted by a vacuum pump (not shown). The parting surface of the male mold 1 has a rectangular fitting groove 1a.
However, a rectangular fitting groove 2b is formed on the parting surface of the female mold 2 so as to face the fitting groove 1a.

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

X is a painting film. The painting film X is pulled out from the roll R in the direction of the arrow by the chuck device 34 and sent to a position facing the female die 2 as described later.

The hot platen 9 has a laminated structure in which a heating plate (not shown), a liner plate, a heater panel, and an insulating plate are arranged in this order. The heating plate heats the painted film X as described later. A rectangular holding frame 14 is fixed to the periphery of the front side surface of the heating plate. This holding frame 1
4 is one of the important components of the present invention. The hot platen 9
The support member 15 is moved by the solenoid 16.
Attached to. By the operation of the solenoid 16,
The hot platen 9 is moved in a direction perpendicular to the surface of the film X. The solenoid 16 moves the hot platen 9 forward and backward to the female mold 2 as described later.

The heating plate of the hot platen 9 is made of a metal having excellent heat conductivity. In a region where the heating plate is surrounded by the holding frame 14, a number of small air blowing holes (not shown) are arranged at a predetermined pitch. These air blowing holes extend from the front side to the rear side of the heating plate. A recess is formed inside the holding frame by the heating plate and the holding frame 14. When a ceramic layer is formed on the front side surface of the heating plate, radiant heat efficiency is improved. The liner plate located behind the heating plate consists of a metal plate having high heat transfer properties. The liner plate has a surface that contacts the rear side of the hot plate. The surface is provided with a groove through which compressed air is sent to the air outlet. A vent is provided at the center of the liner plate. This ventilation hole passes through the liner plate. The ventilation hole passes through the center of the heater panel and the insulating plate. The ventilation hole is opened to the rear side surface of the insulating plate, and the opening of the ventilation hole is connected to the air hose. The air hose can be connected to a low pressure compressor or a high pressure compressor through a three-way switching valve.

On the surface of the holding frame 14, a sealing ring fitting groove (not shown) can be formed. When the sealing ring is fitted into the groove, air leakage is prevented. Further, during the vacuum forming operation, deviation of the painted film from a predetermined position is prevented.

As shown in FIG. 1, a rectangular film holding frame 32 is provided on the side of the female die 2 facing the male die 1. The holding frame 32 operates to hold the painting film X in a completely non-contact state, as described later.

At first, the picture film X is in the form of a strip in which specific symbols are printed at predetermined intervals. The painting film X is wound in a roll R shape and held by the supply holding device S. "Laminated film" for painted film X
In one embodiment, a product obtained by printing a pattern on a thermoplastic resin such as an acrylic resin, an acrylonitrile-butadiene-styrene copolymer (ABS), or polyvinyl chloride can be used.

As an example of the transfer printing film,
A laminate in which a transfer printing layer composed of a transfer protection layer, a design layer and an adhesive layer is formed on a release substrate such as biaxially stretched polyethylene terephthalate resin or propylene can be used.

From the viewpoint of the three-dimensional contour following characteristics (molding characteristics) required in the simultaneous injection painting method, and from the viewpoint of the durability of the design surface (such as abrasion resistance), the diluted film substrate or the transfer layer is diluted. A resin which becomes a non-tacky thermoplastic solid even in a non-crosslinked state after drying of the medium "can be used. 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.
A material obtained by adding a polymerizable cross-linking radical such as an acryl group and a methacryl group to a non-adhesive thermoplastic copolymer such as an acrylic resin at ℃.

The material before the polymerization or before the crosslinking reaction is transferred or laminated on the surface of the injection molded resin article. Thereafter, the resulting laminate is cured by a crosslinking reaction using ultraviolet light or an electron beam.

A sliding rod 36 is integrally fixed to the film holding frame 32.
Penetrates the female die 2 and the movable platen 6 in the operating direction of the ram 7, and is connected to a reciprocating operation mechanism (not shown) located behind. At the lower part of the female mold 2, a holding frame 38 for fixing the film is provided adjacent to the parting surface so as to be able to advance and retreat. The holding frame 38 is a rectangular holding frame 32.
Is a plate material parallel to the lower side, and an operating rod 39 with a gap wider than the width of the film X behind the both ends.
Is fixed, and the operating rod 39 forms an output shaft of the reciprocating drive source 40. On the other hand, on the downstream side of the film roll R supported by the supply holding device S, a pair of feed rolls 42 capable of normal and reverse rotation is provided, and at the time of normal rotation, the painting film X is sent in the direction of the female mold 2, At the time of reverse rotation, the picture film X can be reversely fed toward the roll R.

In this embodiment, the cavity 2 of the female mold 2 is
The exhaust port provided at a has 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. Also,
On the front surface of the hot platen 9, a heat shield plate 43 made of a heat insulating material is provided so as to be movable by a driving device 44.

Next, the operation of the above-described simultaneous injection molding painting apparatus will be described. First, in the state shown in FIG. 1, the feed roll 42 is rotated forward and the chuck device 34 is operated to lower the painting film X to a position covering the parting surface of the female mold 2 as shown in FIG. By this, the painting film X
Comes to a position inside the film fixing holding frame 38. However, in this state, the picture-attached film X is slightly fed by inertia, so that slack and wrinkles remain as shown in FIG. In this state, as shown in FIG. 4, the drive source 40 is actuated to retract the film holding frame 38, and to hold down and fix the leading end of the film X, and at the same time, reverse the feed roll 42. 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. 5, whereby the film holding frame 32 is pushed into the fitting groove 2b of the female die 2. Therefore, the painting film X also enters the fitting groove 2b and is fixed at a predetermined position.

Next, the hot platen 9 at the standby position is moved to the front of the female mold 2. Next, the holding frame 1 on the hot platen 9
4 is brought into contact with the frame 32. In this way, a closed heating space is formed, and the painted film X is heated in a non-contact state with the hot platen 9. After being sufficiently softened, the painted film X is subjected to vacuum suction through the exhaust holes 8. At this time, blowing air from the air blowing holes of the hot platen 9 may be used together, if necessary. By this, the painting film X
Is matched to the shape of the cavity surface 2a.

Thereafter, the hot platen 9 is retracted to the standby position shown in FIG. 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 the resin.

After the molten resin is cooled and solidified, the male mold 1
And the female mold 2 are opened, and then the film holding frame 32 is opened.
Is released from the fitting groove 2b of the female die 2 by sliding the sliding rod 36 toward the male die 1. In this way, the resin molded product fixed to the painting film X is taken out. When the painting film X is a transfer printing film, only the base film is peeled off, and the design is left on the molded product.

In another method for opening the mold, the film holding frame 32 is cooled after the molten resin is cooled and solidified.
Is moved from the fitting groove 2b of the female mold 2 into the fitting groove 1a of the male mold 1. After the painting film X is released, the mold opening operation is performed. According to this method, molding of the molded product from the male mold 1 and the female mold 2 becomes easy.

The effect of the above-described embodiment is as follows.
Is heated and softened in a state where it is directly fixed on the facing surface of the female mold, so that deformation and movement of the painting film X hardly occur. Especially when the pattern is aligned with the mold, a high degree of positional accuracy is easily obtained. When positioning the pattern and the mold irregularities with high precision, a positioning mark such as a cross is printed on the painting film X, and this is detected by a position sensor such as a photoelectric tube fixed to a molding machine, and the painting film is detected. Stop feeding X.

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

In the present invention, a panel heater that radiates near infrared rays can be used. In addition to this heater, an electric heater (using a Nichrome coil and directly transferring Joule radiant heat such as surface resistance) to the painted film X can be used. Heaters that radiate far infrared radiation), ceramic panels that emit far infrared radiation, or dielectric heating. In addition, painting film X
As an example of the thermal transfer method, infrared radiation, electromagnetic waves and the like can be directly used. Furthermore, the air can be heated in the closed space to perform the thermal transfer to the picture film X. Of course, both can be used together.

In this embodiment, the heat shield plate 43 faces the heating side of the front surface of the heat plate 9 at the standby position shown in FIG.
, The radiant heat from the hot platen 9 unnecessarily heats the unformed painting film and the forming device,
It is possible to prevent the painting film from being melted or deformed, and from causing inconvenience such as fire.

[0031]

According to the present invention, the operation of pressing and holding the painted film sent to the female mold to the female mold is reliably performed, and the positioning of the painted film with respect to the female mold is accurately performed. Further, since the holding of the painting film is performed by the film holding frame which is moved by the guide of the sliding rod penetrating the female mold, the film holding frame is moved between the male and female molds and a standby position outside thereof. Space is not required, and space can be used effectively.

[Brief description of the drawings]

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

FIG. 2 is a perspective view of the female mold shown in FIG.

FIG. 3 is an explanatory view showing one operation stage of the apparatus of FIG. 1;

FIG. 4 is an explanatory view showing a next operation stage of FIG. 3;

FIG. 5 is an explanatory view showing a next operation stage of FIG. 4;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Male type 1a Fitting groove 2 Female type 2a Cavity inner surface 2b Fitting groove 7 Ram 8 Exhaust hole 9 Heating plate 14 Holding frame 16 Solenoid 32 Film holding frame 36 Sliding rod 42 Feed roll 43 Heat shield plate X Painting film

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Takashi Tarutani 1-1-1, Ichigaya-Kagacho, Shinjuku-ku, Tokyo Inside Dai Nippon Printing Co., Ltd. (72) Inventor Takeshi Matano Takeshi Ichigaya, Shinjuku-ku, Tokyo 1-1-1, Machi Dai Nippon Printing Co., Ltd. (72) Inventor Kazuhisa Kobayashi 1-1-1, Ichigaya Kagamachi, Shinjuku-ku, Tokyo Dainippon Printing Co., Ltd. (72) Inventor Hiroyuki Atake 1-1-1, Ichigaya-Kagacho, Shinjuku-ku, Tokyo Dai Nippon Printing Co., Ltd. (56) References JP-A-61-137716 (JP, A) JP-A-5-301250 (JP, A) Patent 2749515 (JP) , B2) (58) Fields investigated (Int. Cl. ⁷ , DB name) B29C 45/00-45/84 B29C 33/00-33/76

Claims (1)

(57) [Claims] 1. A conveying means for feeding a painting film between a male mold, a female mold and both sexes and positioning the painting film on a parting surface of the female mold so as to cover the cavity, and transferring the painting film to an inner surface of the female mold cavity. A hot plate displaceable to a position along the female parting surface so as to be heated and softened when in close contact with the mold, and a means for injecting molten resin into the fastened male and female cavities with simultaneous injection molding In the apparatus, a fitting groove is formed on a peripheral edge of the female parting surface,
In order to fix and hold the picture film sent to a position along the female parting surface, a film holding frame is provided so as to be fitted into the fitting groove, and the film holding frame is opened at the female parting surface. An apparatus characterized in that the female mold is supported by a sliding rod slidable in a hole penetrating in a direction connecting the male and female molds, and the sliding rod is drivable in its longitudinal direction.