JPH07241873A - Method and apparatus for injection molding with foil decorating - Google Patents

Abstract

PURPOSE:To prevent hole marks of a hot plate from leaving on a molded item by forming a peripheral wall having a uniform top surface on the hot plate, forming a recession on the inside of the peripheral wall, making holes on the peripheral wall toward the top surface, putting the outer peripheral part of a painting film into contact with the top surface of the peripheral wall by vacuum drawing through the holes, to then be heated while conducting vacuum drawing. CONSTITUTION:The outer peripheral part of a decorating film X supplied from a supply roller is sucked to be held from a vent hole provided on the outer peripheral wall 14a of a hot plate 9 having a recession 14b partitioned by a peripheral wall 14a and, at the same time, the patterns are held in the form of being non-contact with the hot plate 9 by blowing out air from blow holes 17, and thereafter the decorating film X is cut every pattern. As the cut decorating films X are heated by a hot plate, they are transported to the opening of a female mold disposed at the direction practically normal to the supply direction from the supply roller, and the decorating film are transferred to be in close contact with the cavity of the female mold, and then the hot plate is retreated therefrom, so that decorating is done by injecting molten resin into the cavity defined by inserting a male mold into the female mold.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a simultaneous painting method and apparatus for injection molding, and in particular, a printed film cut into individual patterns is used so that traces of a heating plate etc. do not remain on the surface of a molded product. Injection molding simultaneous painting method and apparatus therefor.

[0002]

2. Description of the Related Art Conventionally, a laminating method and a transfer method are known as a method for decorating a three-dimensional molded article. The laminating method is a method in which a film on which a pattern is printed is deformed, or after the film is deformed, the film is attached to a substrate, or after the film is deformed, a resin is filled therein and solidified. The transfer method is a method in which only the picture ink of a film on which a picture is printed in advance is transferred to a molded product.

The applicant of the present invention discloses an injection molding simultaneous painting method and apparatus for applying such a decoration method.
No. 196113 is proposed. This proposal is that the strip-shaped picture film supplied from the supply roll is adsorbed on the heating plate and then cut into one pattern, and the cut picture film is heated and conveyed to the female mold opening. A molten resin is injected into a cavity formed by the male mold and a male mold to form a molded product having a pattern transferred. In this way, by separating the painting films one by one and performing simultaneous injection molding painting such as transfer, it becomes possible to create a large-sized molded product.

However, in the case of molding a molded product by the transfer method disclosed in the above-mentioned JP-A-62-196113, if air bubbles remain when the decorative film adheres to the hot platen, the decorative film becomes uniform. There was a case where the molded product was not heated and traces of vacuum holes for suction of the heating plate were traced on the surface of the molded product, resulting in poor appearance of the molded product.

Therefore, the applicant of the present application has filed Japanese Patent Application Laid-Open No. 3-9632.
In Japanese Patent No. 0, a means for solving the above-mentioned inconvenience has been proposed in which unevenness is formed on the surface of the heating surface of the hot platen and the vacuum holes are made to communicate with each other by the uneven path.

[0006]

However, according to the surface unevenness forming means disclosed in the above-mentioned Japanese Patent Laid-Open No. 3-96320, the unevenness of the rough surface remains on the surface of the molded product depending on the thickness of the painting film, The molded product may have a poor appearance.

Therefore, the present invention has been made to solve the above problems, and an object of the present invention is to provide an injection molding simultaneous painting method and an apparatus therefor in which no traces remain on the surface of a molded product.

[0008]

In order to achieve the above object, the present invention provides an outer peripheral portion of a paint film supplied from a supply roll on the peripheral wall of a heating plate having a recess defined by the peripheral wall. After sucking air from the pores, air is blown out from the air holes to hold the design part in non-contact with the hot plate, and then the design film is cut for each design, and the cut design film is cut. While being heated by the hot platen, conveyed to an opening of a female mold arranged in the same direction as the supply direction from the supply roll or in a direction substantially at a right angle, and the cut decorative film into a female mold cavity. After the transfer and contact, the hot platen was retracted, and molten resin was injected into the cavity formed by inserting the male mold into the female mold so that the molded product was painted.

Further, the hot platen is provided with a concave portion defined by a peripheral wall on the side of the decorative film holding surface, and the decorative film is adhered to the side of the peripheral wall of the decorative film holding surface to form a sealed heating space. Cut each pattern, heat while holding the cut decorative film in a non-contact manner, bring the heated decorative film into close contact with the female mold cavity, and in the cavity formed between the male mold An injection molding simultaneous painting apparatus for injecting a molten resin and painting a molded product, wherein the hot platen has blowout holes for blowing air to separate the painted film from the hot platen, and the peripheral wall is , And a ventilation hole for sucking the above-mentioned painting film.

[0010]

Function: The painted film is heated while drawing a vacuum through the through holes (vent holes) while being in close contact with the top surface of the peripheral wall of the heating plate. At the time of this heating, the portion of the painted film that is brought into close contact with the female cavity is heated by the closed space through the recess and is brought into a non-contact state with the heating plate. When making this non-contact state, the non-contact state is secured by blowing air from the blow-out holes to separate the painting film from the heating plate for a certain distance. Therefore, the hot platen does not come into contact with the pattern part, and the trace of the hole of the hot plate is not attached to the pattern part. In this state, it is cut into one pattern, and the cut decorative film is conveyed together with the heating plate to the opening of the female mold to bring the decorative film into close contact with the female mold and form a cavity between the male mold and the female mold. A molten resin is injected into and a molded product with a pattern is created.

[0011]

The present invention will be described below with reference to the illustrated embodiments. FIG. 1 shows an overall schematic configuration of an injection molding simultaneous painting apparatus applied to the present invention.

As shown in FIG. 1, a belt-shaped picture film X is wound around a supply roll (not shown) from the upper side to the lower side (arrow YA direction) with respect to a heating surface of a heating plate 9 described later. Are transported by a transport device (not shown). The conveyed picture film X is attracted to the hot platen 9 and the like,
It is cut one by one by a cutter means 35 described later.
The hot platen 9 that has adsorbed the cut decorative film X is moved in the direction of the arrow XA and stopped at a predetermined position between the male mold 1 and the female mold 2 that are arranged opposite to each other. In this stopped state, simultaneous painting with injection molding is performed.

As shown in FIG. 2, the male die 1 is fixed to a stationary platen 3 so as to face the female die 2, and the male die 1 is provided with an injection nozzle 5 in communication with an injection gate 4. The female die 2 is fixed to a ram 7 via a movable plate 6 and is driven in a direction in which the ram 7 is moved in and out of contact with the male die 1 by advancing and retracting the ram 7. Further, the female die 2 is provided with an exhaust hole 8 for exhausting air in the female die 2 to the outside by using a vacuum pump (not shown) at the time of vacuum pressure forming of a painting film which will be described later. A hot platen 9 is arranged at a side position (see FIG. 1) between the male mold 1 and the female mold 2, and the hot platen 9 is carried in between the molds 1 and 2 by a driving means (not shown). It is carried in (indicated by the chain double-dashed line). The heating plate 9 adsorbs the decorative film X at a side position, that is, a standby position, and moves to the carry-in position to supply the decorative film X between the molds 1 and 2. Then, the heating plate 9 heats the adsorbed decorative film X to moderately soften it while moving from the standby position to the carry-in position. Further, the painted film X is adsorbed from the hot platen 9 to the cavity forming surface 2a of the female die 2 by vacuum pressure forming from the loaded state. Therefore, the hot platen 9 is a surface facing the female die 2 (a surface holding the painted film).
Adsorb the painting film X on the side.

FIG. 3 shows a schematic structure of the heating plate 9 and the like, and FIG. 4 shows a detailed structure of the heating plate 9 and the like. As shown in FIGS. 3 and 4, the hot platen 9 has an integrated structure in which a heating plate 10, a liner plate 11, a heater plate 12, and an insulating plate 13 are combined and laminated in this order from the side where the painting film X is adsorbed. A frame-shaped suction plate 14 is attached to the surface of the heating plate 10. The hot platen 9 includes a support member 15 and solenoids 16, 16,
The hot platen 9 is movable in a direction perpendicular to the carrying-in direction by the operation of the solenoids 16 and 16. In that case, the solenoids 16 and 16 move toward and away from the female mold 2.

In the heating plate 9, the heating plate 10 is made of a metal plate having excellent heat conductivity, and the peripheral wall 14a of the adsorption plate 14 is used.
A large number of small-diameter air blowing holes 17 to 17 penetrating the front and back are arranged at a predetermined pitch in a portion surrounded by. The peripheral wall 14a of the heating plate 10 and the suction plate 14
Thus, the concave portion 14b is formed. The liner plate 11 located on the back surface side of the heating plate 10 is also made of a metal plate having excellent thermal conductivity, and a groove for supplying compressed air to the air blowing holes 17 to 17 on the surface portion in contact with the back surface of the heating plate 10. 18 is formed, and an air passage 19 is provided at the center of the liner plate 11 so as to communicate with the groove 18. The air passage 19 also penetrates through the central portions of the heater plate 12 and the insulating plate 13 and is opened on the back surface of the insulating plate 13, and an air hose 20 is connected to the opening. The air hose 20 is switched and connected to a low pressure compressor 22 and a high pressure compressor 23 by a three-way switching valve 21.

A large number of heaters 24 to 24 are arranged inside the heater plate 12, and these heaters 2 to 24 are provided.
Wiring (not shown) is provided to supply power to 4 to 24. The insulating plate 13 has a function of effectively transmitting the heat generated by the heaters 24 to 24 to the heating plate 10.

On the other hand, the peripheral wall 14a of the suction plate 14 has an O-ring fitting groove 25 on the surface thereof as shown in FIGS. 4 and 6 (enlarged view of a portion A in FIG. 4).
Is formed in an annular shape along the peripheral wall 14a of the
The ring 26 is fitted. The O-ring 26 can prevent air leakage to the outside and deviation of the painting film during vacuum forming. An annular air passage 27 is formed on the back surface in contact with the heating plate 10, and a large number of small air holes 28 to 28 communicating with the air passage 27 are formed at predetermined intervals at both inner and outer positions sandwiching the O-ring 26. There is. The air passage 27 has a three-way switching valve 2 as shown in FIG.
Via the vacuum pump 30 and the high-pressure compressor 23
Connected to.

With respect to the hot platen 9 having such a structure, a film pressing means 31 is provided at a standby position of the hot platen 9 so as to face it (see FIGS. 3 and 4). This film pressing means 3
1 is a film pressing plate 32 and the film pressing plate 3
2 has an air cylinder 33 for moving the hot plate 2 in a direction adjacent to the hot platen 9. The film pressing means 31 is arranged so that the film pressing plate 32 is separated from the heating platen 9 when it is separated from the heating platen 9.
There is a chuck means 34 for drawing the picture film X between the film holding plate 32 and the film holding plate 32, and a cutter means 35 driven by an air cylinder 36 for cutting the drawn picture film X into a predetermined size.

That is, the picture film X is an arbitrary picture Y.
(See FIG. 5) is formed in a band shape drawn at regular intervals, and is wound and set in a roll shape on a film setting unit (not shown). Then, the chuck means 34 grabs the end of the picture-bearing film X and removes the hot plate 9 from the film setting section.
Is configured to be pulled out by a predetermined length on the front surface of the. In this case, the amount of drawing out is long enough to supply the pattern portion required for one-time resin molding to the front surface of the hot platen 9, and the painted film portion having this pattern Y is the film pressing plate 3
It is pressed against the hot platen 9 by 2. At the time of pressing the film, the peripheral wall 14a of the suction plate 14 of the hot platen 9 is pressed by the film pressing plate 32 at the peripheral portion surrounding the pattern Y, and in this state, the cutter means 35 cuts the decorative film X. , Cut off the painted film that is being pressed.

Next, the injection molding simultaneous painting method of this embodiment will be described with reference to the time chart shown in FIG. First, with the hot platen 9 in the standby position (see FIG. 1) and the film pressing plate 32 separated from the hot platen 9,
As described above, the chuck means 34 draws the decorative film X to the front position of the heating plate 9 (step S1), and the drawn drawing film X is pressed against the front surface of the heating plate 9 by the film pressing plate 32 (step S2). . In conjunction with this, the air passage 27 is communicated with the vacuum pump 30 by the three-way switching valve 29, and air is sucked through the ventilation holes 28 to 28 provided in the suction plate 14, so that the pattern Y of the painting film X is transferred. The surrounding peripheral portion is adsorbed to the peripheral wall 14a of the frame-shaped adsorption plate 14 (step S3). Further, the air passage 19 and the groove 18 are communicated with the low-pressure compressor 22 by the three-way switching valve 21.
A small amount of low-pressure air is blown out from the air blowing holes 17 to 17 provided in the heating plate 10, the film is cut by the cutter means 35 thereafter, and the film pressing plate 32 moves backward from the heating plate 9. (Step S4). The amount of air blown out from the air vents 17 to 17 is balanced with the amount of suction from the air vents 28 to 28,
The paint film X keeps non-contact with the hot platen, and the suction plate 14
Adjust it so that it does not slip out or cause tarmi.

After the movement, the hot platen 9 is moved between the molds 1 and 2, and the picture film X is carried in the front surface of the female mold 2. After this loading, each three-way switching valve 21, 29
By keeping the vacuum pump 30 and the low-pressure compressor 22 in communication with each other, the picture film X is adsorbed to the peripheral wall 14a of the adsorption plate 14 at the periphery of the picture, and air is blown between the picture film X and the heating plate 10. Be done. Therefore,
The painting film X is carried in in a flat state (non-contact state) in which it does not contact the surface of the heating plate 10. Since the heating plate 10 of the heating plate 9 is heated by the heaters 24 to 24, the paint film X is transferred from the heating plate 10 through the radiant heat and / or air from the adsorption to the completion of the loading. It is heated by the transfer heat of and softened moderately. In addition, since it is necessary to heat and soften the paint film X,
It is made of a thermoplastic resin film, but the degree of softening is not less than the softening temperature of the thermoplastic resin (defined by the Vicat softening temperature etc.) and lower than the melting temperature.

After the carry-in, the solenoids 16 and 16 are excited to move the heating plate 9 forward toward the female mold 2 (step S5), and as shown in FIG. 8, it is brought into close contact (step S6). At the same time, air is sucked and discharged from the sealed internal space (sealed space) of the female mold 2 through the exhaust hole 8 in the female mold 2, and the inside of the female mold 2 is evacuated (step S
7). Then, in the hot platen 9, three-way switching valves 21, 2
By the switching operation of 9, the respective air passages 19, 27
The high-pressure compressor 23 is connected to, and high-pressure compressed air is blown out from the air blowing holes 17 to 17 (step S8). By this blowing, the painting film X is brought into close contact with the cavity forming surface 2 a of the female die 2 by the air pressure and the vacuum force inside the female die 2. That is, vacuum pressure forming on the die of the film. At the same time, high-pressure air is blown out from the ventilation holes 28 to 28, and the suction force of the decorative film X is released. Subsequently, as the heating plate 9 is separated from the female mold 2 and returned to the standby position (step S9), the female mold 2 and the male mold 1 are joined by the operation of the ram 7, and the two molds are clamped in the clamped state. Molten resin is discharged into the cavities in the molds 1 and 2, and resin molding is performed (step S10), and at the same time, the pattern Y of the decorative film X is transferred to the resin molded product for painting.

As described above, in the process of adsorbing the decorative film X by the hot platen 9 and carrying it in between the molds 1 and 2 while heating, the decorative film X is attached to the peripheral wall 14a of the adsorption plate 14 only in the peripheral portion of the pattern. And the pattern portion is floated from the concave portion 14b formed by the suction plate 14, and a small amount of low pressure air is blown between the painting film X and the heating plate 10 to force the floating state. Therefore, the shape of the air blowing holes 17 to 17 opened in the heating plate 10 does not become uneven in the pattern Y portion of the painting film X. Therefore, the surface of the resin product is not uneven, and unnecessary change in gloss does not occur.

[0024]

As described above, according to the present invention, 1
Since the non-contact heating is performed when preheating the decorative film cut into pieces, the heating plate and the decorative portion of the decorative film do not come into contact with each other. Therefore, no trace of the through hole of the heating plate remains on the painted film, and no trace remains on the molded product. Further, since the sheet is cut and separated for one shot (one pitch) of the pattern from the winding supply roll, and heating, conveyance and molding are performed, wrinkles are formed on the sheet around the hot platen holding section in these steps other than heating. Even if there are
It does not affect the sheets for these shots and is easier to position than the connecting sheet.

[0025]

[Brief description of drawings]

[0026]

FIG. 1 is an overall schematic configuration diagram of an injection molding simultaneous painting apparatus to which the present invention is applied.

[0027]

FIG. 2 is a top view of a male mold and a female mold in the injection molding simultaneous painting apparatus.

[0028]

FIG. 3 is a side view of a heating plate in the injection molding simultaneous painting apparatus.

[0029]

FIG. 4 is an enlarged side view including a partial cross section of the heating plate.

[0030]

FIG. 5 is a side view of the hot platen.

[0031]

FIG. 6 is an enlarged cross-sectional view of a main part of the hot platen.

[0032]

FIG. 7 is a view showing a state in which a painting film is sandwiched by a hot platen and a pressing means in the injection molding simultaneous painting device.

[0033]

FIG. 8 is a cross-sectional view showing a state in which a painting film is adsorbed by a female mold in the injection molding simultaneous painting device.

[0034]

FIG. 9 is a time chart showing an operation of the injection molding simultaneous painting apparatus.

[0035]

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Male type 2 ... Female type 2a ... Cavity constituting surface 9 ... Hot plate 10 ... Hot plate 14 ... Adsorption plate 14a ... Adsorption plate peripheral wall 14b ... Recessed portion 17 ... Air blowing hole 25 ... O ring fitting groove 26 ... O ring 28 ... Ventilation hole 32 ... Film pressing plate 35 ... Cutter means X ... Painting film

─────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] February 16, 1993

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] 0025

[Correction method] Delete

[Procedure Amendment 2]

[Document name to be amended] Statement

[Name of item to be corrected] Brief description of the drawing

[Correction method] Change

[Correction content]

[Brief description of drawings]

FIG. 1 is an overall schematic configuration diagram of an injection molding simultaneous painting apparatus to which the present invention is applied.

FIG. 2 is a top view of a male mold and a female mold in the injection molding simultaneous painting apparatus.

FIG. 3 is a side view of a heating plate in the injection molding simultaneous painting apparatus.

FIG. 4 is an enlarged side view including a partial cross section of the heating plate.

FIG. 5 is a side view of the hot platen.

FIG. 6 is an enlarged cross-sectional view of a main part of the hot platen.

FIG. 7 is a view showing a state in which a painting film is sandwiched by a hot platen and a pressing means in the injection molding simultaneous painting device.

FIG. 8 is a cross-sectional view showing a state in which a painting film is adsorbed by a female mold in the injection molding simultaneous painting device.

FIG. 9 is a time chart showing an operation of the injection molding simultaneous painting apparatus.

[Explanation of Codes] 1 ... Male type 2 ... Female type 2a ... Cavity constituting surface 9 ... Hot platen 10 ... Hot platen 14 ... Adsorption plate 14a ... Adsorption plate peripheral wall 14b ... Recesses 17 ... Air blowout hole 25 ... O ring fitting Groove 26 ... O-ring 28 ... Ventilation hole 32 ... Film pressing plate 35 ... Cutter means X ... Painting film ──────────────────────────── ─────────────────────────

[Procedure amendment]

[Submission date] November 8, 1993

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] 0024

[Correction method] Change

[Correction content]

[0024]

As described above, according to the present invention, 1
Since the non-contact heating is performed when preheating the decorative film cut into pieces, the heating plate and the decorative portion of the decorative film do not come into contact with each other. Therefore, no trace of the through hole of the heating plate remains on the painted film, and no trace remains on the molded product. Further, since the sheet is cut and separated for one shot (one pitch) of the pattern from the winding supply roll, and heating, conveyance and molding are performed, wrinkles are formed on the sheet around the hot platen holding section in these steps other than heating. Even if there are
It does not affect the sheets for these shots and is easier to position than the connecting sheet.

[Procedure Amendment 2]

[Document name to be amended] Statement

[Name of item to be corrected] Brief description of the drawing

[Correction method] Change

[Correction content]

[Brief description of drawings]

FIG. 1 is an overall schematic configuration diagram of an injection molding simultaneous painting apparatus to which the present invention is applied.

FIG. 2 is a top view of a male mold and a female mold in the injection molding simultaneous painting apparatus.

FIG. 3 is a side view of a heating plate in the injection molding simultaneous painting apparatus.

FIG. 4 is an enlarged side view including a partial cross section of the heating plate.

FIG. 5 is a side view of the hot platen.

FIG. 6 is an enlarged cross-sectional view of a main part of the hot platen.

FIG. 7 is a view showing a state in which a painting film is sandwiched by a hot platen and a pressing means in the injection molding simultaneous painting device.

FIG. 8 is a cross-sectional view showing a state in which a painting film is adsorbed by a female mold in the injection molding simultaneous painting device.

FIG. 9 is a time chart showing an operation of the injection molding simultaneous painting apparatus.

[Explanation of Codes] 1 ... Male type 2 ... Female type 2a ... Cavity constituting surface 9 ... Hot platen 10 ... Hot platen 14 ... Adsorption plate 14a ... Adsorption plate peripheral wall 14b ... Recesses 17 ... Air blowout hole 25 ... O ring fitting Groove 26 ... O-ring 28 ... Ventilation hole 32 ... Film pressing plate 35 ... Cutter means X ... Painted film

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Inventor Kazuhisa Kobayashi 1-1-1, Ichigayaka-cho, Shinjuku-ku, Tokyo Dai Nippon Printing Co., Ltd. No. 15 Inside Navitas Co., Ltd. (72) Inventor Hiroaki Noguchi 1 Kyosen Chemical Industry Co., Ltd.

Claims (2)

[Claims] 1. The air is blown from the blow-out hole while holding the outer peripheral portion of the painting film supplied from the supply roll by sucking it from a ventilation hole provided in the peripheral wall of the heating plate having a concave portion defined by the peripheral wall. The non-contact part of the pattern is held on the hot platen, then the decorative film is cut into individual patterns, and the cut film is heated by the hot platen while feeding in the feeding direction from the supply roll. It is conveyed to an opening of a female mold arranged in a direction substantially perpendicular to, and after the cut pictured film is transferred to and closely adhered to the cavity of the female mold, the hot platen is withdrawn, and the male mold is attached to the female mold. An injection molding simultaneous painting method, characterized in that a molten resin is injected into a cavity formed by inserting a die to paint a molded article. 2. A hot platen is provided with a concave portion defined by a peripheral wall on the side of the decorative film holding surface, and the decorative film is adhered to the side of the peripheral wall of the decorative film holding surface to form a sealed heating space, and then the decorative film is formed. Cut each pattern,
While heating the cut decorative film in a non-contact manner, the heated decorative film is brought into close contact with the female mold cavity, and a molten resin is injected into the cavity formed between the male mold and the molded product, An injection molding simultaneous painting apparatus for painting, wherein the hot platen has an outlet hole for blowing air to separate the painted film from the hot platen, and the peripheral wall is
An injection-molding simultaneous painting device comprising a vent for sucking the painting film.