JPH09150432A - Method and apparatus for injection molding with simultaneous in-mold decorating - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make an installation and a space for sheet trimming unnecessary out of a mold and to bringing a decoration sheet into close contact with a cavity face by performing trimming process of the decoration sheet by a cutting means provided on a part except mold forming parts of a male mold and a female mold after drawing process and before taking-out process. SOLUTION: A decoration sheet is sucked by vacuum and is drawn so as to be along the cavity face 13 of a female mold and mold clamping is performed. Then, a molten resin P is fed and filled into a cavity 13 from an injection molding machine through a path 42 for a melt to perform injection molding. Just before this injection molding is completed, four fluid pressure cylinders 47 arranged on a male mold 40 are actuated and cutting blades 30 are pushed on the parting face 12a side to perform a trimming process for cutting and separating a part to be sticked on an injection molding in the decoration sheet from other parts. Just after this cutting, the four fluid pressure cylinders 47 are made to OFF condition and the cutting blades 30 are returned to its original state and a molded article on which the decoration sheet is integrated by adhesion is taken out from the cavity 13.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a simultaneous injection-molding method and apparatus for simultaneously injection-molding a molded sheet to a molded product to obtain a molded product having a design, characters and the like. .

[0002]

2. Description of the Related Art Several modes have been proposed in the past as a simultaneous injection molding painting method for integrally adhering a painting sheet to the surface of a molded article at the same time as injection molding, but most of them are as follows. All or some of the steps a) to (i) are carried out in the order described or the order thereof is interchanged, and a plurality of steps are sequentially performed simultaneously or in parallel.

(A) A sheet supplying step of supplying (a next shot portion of) a strip-shaped sheet or a sheet with a picture formed of a single sheet between a female mold and a male mold which are opposed to each other. (B) a clamping step of fixing and holding the painted sheet on the female parting surface; (C) A softening step of heating and softening the painted sheet with a hot plate or the like. (D) A drawing step (preforming step) of drawing the painted sheet along the cavity surface of the female mold by vacuum suction and / or pressured air supply.

(E) A mold clamping process in which one of the female mold and the male mold is moved to the other side to perform mold clamping. (F) Resin that is in a fluid state from the male die side into the female die (molten resin)
Injection molding process of performing injection molding by injecting filling. (G) A mold opening step of separating the female mold and the male mold. (H) A trimming step (sheet cutting step) of separating a portion of the painted sheet to be adhered and attached to the injection-molded article from other portions.

(I) A step of taking out the injection-molded article to which the decorative sheet is adhered from the female mold. In addition, performing a plurality of steps simultaneously at the same time means that a plurality of steps are included in one step. For example, the above (e)
In the mold clamping step, if the painting sheet is sandwiched between the female mold and the male mold and fixedly held, it means that the clamping process of (b) is performed simultaneously with the mold clamping process. Further, if the drawing sheet is stretched by the heat and pressure of the injected molten resin in the injection molding step (f), the stretching step (d) is performed simultaneously with the injection molding step. When it comes to being told.

As the painting sheet, either a laminated laminated sheet (laminate sheet) or a transfer sheet is used depending on the product type. In the case of a laminate sheet, the painting can be performed as it is by injection molding. As a result, all layers of the sheet are bonded and integrated to the outer surface of the injection-molded product to form a decorative layer. On the other hand, when the decorative sheet is a transfer sheet, the support sheet of the decorative sheet integrated on the outer surface of the molded product is peeled off, and the transfer layer such as a decorative layer is left on the molded product side to remove the decorative layer. The painting is completed by

By the way, in the simultaneous injection molding painting method, as described in (h) above, not only when the painting sheet to be used is a long strip-shaped sheet fed from an unwinding roll, but also when it is a single sheet. Usually, there is a step of cutting and removing the surplus portion (mainly the outer peripheral portion), in other words, a trimming step (sheet cutting step) of separating the portion of the painted sheet that should be attached to the injection-molded product from other portions. Although essential, this trimming process has been conventionally performed in the following modes (1) to (4).

(1) Outside the mold, that is, before the sheet feeding step of (a) above, the decorative sheet is cut into a size and shape corresponding to the decorative region of the molded product to be bonded, and the female mold is cut. Set in the cavity. (2) A sheet with a sheet or a sheet with a sheet is attached and set so as to cover the opening of the cavity of the female mold, and the sheet with the sheet is fitted into the peripheral edge of the cavity of the female mold and the cavity. The male fitting convex part to be punched by a pair of shearing blades provided on the outer peripheral edge part of the male fitting convex part (JP-A-60-212314,
See JP-A-57-116623 and JP-B-5-72246). In this aspect, the trimming process is performed simultaneously with the mold clamping process for the male mold and the female mold of (e) at the same time.

(3) An undercut portion is formed at the end of the cavity by devising the shape of the molding die (for example, by dividing the female die), and the painted sheet is stretched by the heat and pressure of the injected molten resin. At the same time, the portion to be cut is pressed against the edge of the tip of the undercut portion and the shear stress is concentrated on the edge (see Japanese Patent Publication No. 7-533).
No. 97). Therefore, in this aspect, the trimming step is performed simultaneously with the injection molding step (f).

(4) Clamping is performed so that the next shot part of the picture-formed sheet consisting of a long strip-shaped sheet unwound from the unwinding roll is directly sandwiched between the male mold and the female mold, and after the injection molding process. Trimming is performed in another process after the extraction process. Here, when the decorative sheet is a laminated sheet, the molded product in which the decorative sheet is adhesively integrated is moved together with the long strip-shaped decorative sheet to the downstream of both male and female molds, and the molded product is extruded. Cut so as to leave a part and punch out the part that is adhered to the molded product (the part that should be attached to the injection molded product) and separate it from the other part, and wind the remaining part (belt-shaped sheet with holes) It is wound up on a roll (see Japanese Patent Application Laid-Open No. 2-59315). On the other hand, when the painting sheet is a transfer sheet, generally, there is no trimming step like a laminating sheet and a sheet sheet is often used as the painting sheet, but when a belt-shaped transfer sheet is used. The transfer sheet is formed by moving the molded product with the transfer sheet bonded and integrated together with the transfer sheet to the downstream side of the male and female molds, and from the support sheet that is molded into the external shape (concave shape) of the transfer sheet. The molded product on which the transfer layer has been transferred is taken out by pulling out, and the remaining transfer sheet (support sheet) having recesses is wound on a winding roll if it is not bulky, and if it is bulky (if it cannot be rolled up), it is appropriately Cut and dispose of.

[0011]

However, in the above aspect (1), trimming equipment and space are separately required outside the mold, and it takes a lot of time to set the painting sheet in the female mold cavity. The productivity is poor, and the picture sheet set in the female cavity has a free open outer peripheral edge, so it is difficult to bring it into close contact with the cavity surface by vacuum suction, etc., and wrinkles and misalignment easily occur. There's a problem.

In the above-mentioned aspect (2), the dimensions are incorrect due to the difference in the amount of thermal expansion between the male die and the female die, and the engagement is likely to be poor, the shearing is poor, and the mold is not properly clamped. If it wears, not only will shear failure occur, but the sealing performance between the male and female molds will be impaired, resulting in poor mold clamping.
Since the shearing blades are integrally provided on both male and female molds, which causes molding defects, that is, cutting means is provided on the mold forming portion such as the female mold cavity or the male fitting convex portion. Therefore, if the cutting means deteriorates due to wear or the like, even if there are no problems in other parts, the entire expensive male and female dies must be rebuilt, and the life of the entire die is the life of the cutting means. Is disadvantageous in terms of cost,
There is a problem that the trimming shape of the painted sheet is limited to the shape of the female cavity opening surface.

In the above aspect (3), the outer shape of the molded product is limited to those having an undercut, the female mold is divided and the edges (blades) are provided, and the structure of the mold is complicated and expensive. However, the method of pressing while drawing the sheet with the drawing on the edge and stretching while cutting has a problem in reliability, reliability, and lack of reproducibility of the cutting position as compared with the cutting using a normal blade or the like. is there.

In the aspect (4), when the mold is opened or when the molded product integrated with the decorative sheet is taken out from the female mold, stress is concentrated near the outer peripheral edge portion, and the decorative sheet is likely to be broken or wrinkled. In particular, when the painting sheet is a transfer sheet, the painting sheet (support sheet) with the recesses remaining cannot be wound up. Therefore, a continuous strip-shaped sheet is fed from the unwinding roll with high productivity toward the winding roll. There are problems that the roll / roll method cannot be adopted, and equipment and space for trimming are required outside the mold.

The present invention has been made to solve the above-mentioned problems, and its purpose is not to separately require equipment or space for sheet trimming outside the mold, and to perform the trimming process. For this reason, the painted sheet can be brought into close contact with the cavity surface by vacuum suction, etc. without taking special time, and wrinkles, breaks, misalignment, etc. can be made less likely to occur, and the mold forming part of both male and female molds can be made. It is possible to reliably trim the painted sheet without providing special shearing blades or edges, and to reduce the device cost as much as possible, resulting in poor cutting, poor mold clamping, poor molding, etc. An object of the present invention is to provide a simultaneous injection-molding painting method and apparatus which can be made difficult and which can effectively enhance productivity.

[0016]

In order to achieve the above object, the injection molding simultaneous painting method according to the present invention is basically a sheet feeding step of feeding a painting sheet between a female mold and a male mold. A clamping step of fixing and holding the decorated sheet on the parting surface of the female mold, a stretching step of stretching the decorated sheet along the cavity surface of the female mold, and a stretching step of the female mold and the male mold. A mold clamping step of moving one to the other side to perform mold clamping, an injection molding step of injecting and filling a resin in a fluid state into the female mold from the male mold side for injection molding, and the female mold and the male mold. A mold opening step of separating the mold from each other,
And a step of taking out the injection-molded article to which the painted sheet is adhered from the female mold, and the steps are described in the order described or the order thereof is replaced, sequentially, or a plurality of steps are simultaneously overlapped or in parallel. To be done.

Then, a trimming step for separating a portion of the picture-added sheet to be attached to the molded product from other portions is performed by a cutting means provided in a portion other than the female and male die forming portions. It is characterized in that it is performed after the stretching step and before the extracting step. Further, the injection-molding simultaneous painting apparatus according to the present invention is suitable for carrying out the injection-molding simultaneous painting method, and within the period after the stretching step and before the extracting step, among the painting sheets. A cutting means capable of separating a part to be attached to the molded article from other parts is attached.

In a preferred embodiment of the injection molding simultaneous painting apparatus of the present invention, the cutting means comprises a tool such as an annular Thomson blade capable of enclosing the outer peripheral edge of the cavity surface of the female mold. Which is movable in the vertical direction with respect to the picture-added sheet fixedly held on the parting surface, and a clamping means for fixing and holding the picture-added sheet between the female parting surface and the parting surface. In addition to being provided, the clamping means is provided with the cutting means.

In the injection molding simultaneous painting method of the present invention,
In the trimming step, the stretching step of stretching the painted sheet along the female mold cavity is performed by vacuum forming and / or compressed air supply, and is performed after the stretching step and before the extracting step. In the case where the stretching step is performed by hot pressing the injected molten resin, after the injection molding step, more preferably after the injection filling of the resin is completed and the resin is substantially cured and before the unloading step. To be done.

That is, in the trimming step in the injection molding simultaneous painting method of the present invention, the painting sheet is brought into close contact with the female mold cavity surface so that undesired behavior such as displacement and deformation does not occur. It suffices that it is after the time when there is no concern about defective molding due to air leakage during vacuum suction, and before the extraction process begins. In the present invention, the cutting means can be provided in a portion other than the mold forming portion such as the female cavity or the male fitting convex portion, that is, the life of the cutting means does not affect the life of the mold. Anything can be used as long as it is a normal plate-shaped or disk-shaped cutter, a die cutting product such as a Thomson blade, a laser beam or an ultrasonic wave, or a heating wire can be used. .

The cutting means can be driven by using a molding driving force such as a mold clamping operation or by using the power of an ejector pin driving mechanism. Separately, driving means such as a fluid pressure actuator can be used for both male and female. This is done by providing it in a portion other than the die forming portion of the die. As for the operation timing of the cutting means, in the case of a drive source, for example, a cutter such as a Thomson blade, a fluid pressure cylinder, an electric motor, etc. are turned on.
It may be turned off, and in the case of using laser light, ultrasonic waves, or heating wire, the power supply path may be opened and closed.

The male and female dies may be made of metal such as iron or ceramics, and may have a divided structure (providing an intermediate die or the like) depending on the shape of the molded product. In addition, when using a preforming die for a painted sheet, a heating plate for heating and softening is attached, or a small hole (vacuum suction hole) is used for vacuum suction or compressed air supply (preforming) for the female and male dies. Etc.) The painting sheet is
The sheet may be supplied in a required amount (one shot at a time) from the state of a long continuous strip-shaped sheet wound in a roll, or may be supplied in the form of a sheet that is cut into a predetermined size in advance. Good. In addition, in order to supply the sheet with (the next shot portion of) the strip-shaped sheet or the sheet with a sheet between the female and male dies opposed to each other, a roll / roll using a winder and a winder is used. A method (a method in which a continuous strip-shaped sheet is supplied from the unwinding roll to the winding roll) may be used, or a method in which a robot (manipulator) equipped with a suction plate or the like holding the above-mentioned sheet is used for conveyance In terms of productivity, the roll / roll method is recommended.

Clamping means may be provided to fix and hold the picture-added sheet on the female parting surface. As the clamping means, a frame-shaped pressing plate or the like can be used, and the driving thereof can use a molding driving force such as a mold clamping operation, or can use the power of an ejector pin driving mechanism. By providing a driving means such as a fluid pressure actuator. When the cutting means is provided in the clamping means, in order to trim the sheet, the clamping means is re-driven before the taking-out step, or the cutting means is moved from the fixed side (male side) to a hydraulic cylinder or the like. It may be pushed by means.

When it is necessary to position the decorative pattern such as the picture pattern of the painting sheet and the female cavity surface (molded product) with high accuracy, the painting sheet is provided with, for example, a "+" shape, a "-" shape, A positioning mark such as an "I" shape may be provided, and this may be detected by a photoelectric tube, an image sensor, or the like provided on the mold side or the movable mold itself to control the operation of the sheet feeding mechanism such as the servo motor. Further, when high accuracy is not required for the positioning, the positioning mark is not used, and the sheet may be simply fed by a certain amount by a step motor or the like.

The decorative sheet comprises a base sheet and a decorative layer laminated on the base sheet, and is used as a final laminated product (laminate sheet) which is used as a final product while the base sheet is closely adhered to the molded product. A transfer sheet can be used in which the decorative sheet (transfer layer) is left on the molded product side and the base material sheet (support sheet) is peeled off after the decorative sheet and the molded product are integrated. The present invention is particularly effective for a laminate sheet in which an injection-molded product cannot be peeled from a decorative sheet.

As the base sheet, a thermoplastic resin such as polyvinyl chloride, acrylic, polystyrene, ABS resin, polycarbonate, polyester, and polypropylene can be used. The thickness of the base sheet is usually 2
It is about 0 to 500 μm. The decorative layer may be a layer having a visual design such as a printed pattern, a colored or transparent coating, a metal thin film, or the like, or a layer having functionality such as a hard coating film, an antifogging coating film, or a conductive layer.

A resin in a fluid state for injection molding is A
Heat-melted thermoplastic resin such as BS (acrylonitrile-butadiene-styrene copolymer), polystyrene and polycarbonate, or two-component curing type and catalyst curing type resin, for example, uncured liquid such as polyurethane and polyester. Conventionally known materials can be used for simultaneous injection molding and painting.

In the injection molding simultaneous painting method and apparatus according to the present invention configured as described above, the trimming step of separating the portion of the painting sheet to be attached to the molded product from other portions is performed. In the case where the stretching step for stretching along the female mold cavity is performed by vacuum forming and / or air pressure supply, the stretching step is performed after the stretching step and before the extracting step, and the stretching step is injected. In the case of performing the heat-pressing of the molten resin, it is performed after the injection molding step, and more preferably after the injection filling of the resin is completed and the resin is substantially cured and before the take-out step.

Therefore, in the trimming process, the painted sheet is closely attached along the female mold cavity surface,
Unwanted behavior such as misalignment or deformation does not occur anymore, and there is no concern about molding failure due to air leakage during vacuum suction or injection resin wrapping between the painting sheet and the mold. As a result, it is performed before the take-out process starts, and as a result, there is no need for extra equipment or space for sheet trimming outside the mold, and no special time is taken for the trimming process. , The painted sheet can be brought into close contact with the cavity surface by vacuum suction or the like, and wrinkles, breaks, misalignment, injection resin wrapping, etc. can be made less likely to occur, and special shearing blades or The painted sheet can be surely trimmed without providing an edge or the like, and the device cost can be suppressed as much as possible, and cutting defects, mold clamping defects, molding defects, etc. are less likely to occur. It is possible to effectively enhance the productivity come.

[0030]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a schematic view showing an embodiment of an injection molding simultaneous painting apparatus according to the present invention. The apparatus 10 of the illustrated example includes a male mold 40 and a female mold 12 having an uneven shape corresponding to a molded product to be obtained, and the male mold 40 is a fixed platen provided with a mounting portion 43 to which a nozzle of an injection molding machine is mounted. Four
4, the female die 12 has a working chamber 16 provided on the bottom side thereof fixed to the movable platen 11, and is moved toward and away from the male die 40 by the ram 15 of the fluid pressure cylinder (horizontal direction). Direction or vertical direction).

Working chamber 1 provided at the bottom of the female die 12
6, an ejector pin (not shown) for ejecting the obtained injection-molded article out of the mold is usually arranged.
In the present embodiment, as can be seen with reference to FIG. 2 as well, a rectangular or square frame-shaped clamper 25 for sandwiching and holding the picture-added sheet S between the female mold 12 and the parting surface 12a. A drive mechanism 21 such as a fluid pressure cylinder for driving the motor and a drive support plate 22 are provided.

The clamper 25 is composed of four connecting rods 24, 2 made of pipes slidably fitted in through holes 29, 29, 29, 29 provided near the four corners of the female die 12.
4 and 24, which are connected to the drive support plate 22 by the drive mechanism 21.
It can move forward and backward in the vertical direction. The clamper 25 is provided with a cutting mechanism 20 having a cutting blade 30 having a contour shape (rectangular ring in this case) of the peripheral portion of the molded product that constitutes cutting means for trimming the picture-added sheet S. There is. 3 and 4, the cutting blade 30 has a substantially square-shaped base portion 31 and a blade portion 32 provided perpendicularly to the inner peripheral edge thereof.
The slide rods 26, 26, 26, 26 are vertically fixed to the lower sides of the four corners of the base 31. The large diameter portion of the lower end of the sliding rod 26 is slidably fitted and inserted into the tubular connecting rod 24 connected to the clamper 25 (see FIG. 4), and the sliding rods arranged at the four corners. Coil springs 27, 27, 27, 27 are interposed between the clamper 25 and the base portion 31 of the cutting blade 30 so as to surround 26, respectively. Female mold 12
Is floatingly supported so as to be movable back and forth in the vertical direction with respect to the parting surface 12a.

As shown in FIGS. 1 to 4, the female mold 11 is provided with a concave cavity (cavity surface) 13 corresponding to the shape of the molded product to be obtained.
A large number (simple in the drawing) of vacuum suction holes 17 are formed so as to open in the cavity 13, and further, so as to circulate around the outer peripheral edge of the cavity surface 13.
An annular insertion groove 34 into which the cutting blade 32 of the cutting blade 30 is inserted at the time of trimming is formed.

On the other hand, a runner 42 is formed in the center of the male die 40, and the cutting blades 30 are formed near the four corners of the male die 40 against the urging force of the coil spring 27. A fluid pressure cylinder 47 for pushing to the parting surface 12a side (inside the insertion groove 34) is arranged, and further, on the front side of this fluid pressure cylinder 47, the cutting mechanism 20 and the clamper 25 at the time of mold clamping. An annular recess 45 for accommodating the portion is provided. A buffer pad made of rubber or the like is attached to the tip of the piston rod 47a that presses the cutting blade 30 in the fluid pressure cylinder 47.

Further, above the molds 12 and 40 (see FIG. 1) and below (see FIG. 10), there are provided an unwinding machine RS and a winding machine US for conveying the picture-added sheet by a roll / roll method. Further, feed rollers 51, 53, guide rollers 52, 54, etc. for feeding the picture-added sheet S between the female die 12 and the clamper 25 to convey it to the winder US are arranged. A heating plate 60 for heating and softening the picture-added sheet S is on standby above 40 (see FIG. 1).

The heating plate 60 is attached to the tip of the piston rod 64a of the second fluid pressure cylinder 64 which is vertically attached to the tip of the piston rod 62 of the first fluid pressure cylinder 62 so that it can move in two orthogonal directions. Has been In the injection molding simultaneous painting apparatus 10 of the present embodiment having such a configuration, the injection molding using the painting sheet S which is a laminated sheet is performed as follows according to the flowchart as shown in FIG. Simultaneous molding and painting are performed.

First, the picture-added sheet S made of a strip-shaped sheet
The sheet feeding process is performed in which the next shot portion is pulled out by the feed rollers 51 and 53 and is fed to a position facing the cavity surface 13 of the female die 12. In addition,
The detection of the supply position of the painting sheet S is performed by detecting a mark (not shown) such as “+” provided on the painting sheet S by an image sensor (not shown) arranged on the upper surface of the female die 12. .

Next, a clamping step is carried out in which the clamper 25 is pulled toward the female die 12 by the drive mechanism 21 and sandwiches and holds the picture-added sheet S between it and the female die parting surface 12a (FIG. 6). continue,
As shown in FIG. 6, the heating plate 60 has a female cavity surface 1
3 is brought close to the decorated sheet S, and a softening step of heating and softening the decorated sheet S is performed.

Next, a drawing step (preforming step) is carried out in which the heated and softened sheet S is vacuum-sucked through the vacuum suction holes 17 and the suction pipe 19 and stretched along the cavity surface 13 of the female die 12. (See Figure 7). Then, as shown in FIG.
2 is moved to the male mold 40 side to perform mold clamping.

Next, the molten resin P is injected and filled into the cavity 13 of the female die 12 from the nozzle 43 of the injection molding machine through the runner 42 of the female die 40 to perform injection molding. Immediately before completion of this injection molding, as shown in FIGS. 8 and 9, the fluid pressure cylinder 47 disposed in the male die 40,
47, 47, 47 are actuated at the same time, and the piston rods 47a cause the four corners of the cutting blade 30 to resist the biasing force of the coil spring 27 and the parting surface 12a side of the female die 12 (the insertion groove). 34) to perform a trimming step (sheet cutting step) of separating the portion of the painted sheet S to be adhered and attached to the injection-molded product from other portions. Immediately after the cutting blade 30 is inserted into the insertion groove 34 and cuts the picture-added sheet S, the four fluid pressure cylinders 47 are turned off, whereby the cutting blade 30 moves toward the coil spring 27. It is returned to its original state by the urging force.

Thereafter, as shown in FIG. 10, a mold opening step for separating the female die 12 and the male die 40 is performed, and a molded product in which the picture-added sheet S is adhesively integrated is taken out from the female die cavity 13. The hole J trimmed by the cutting blade 30 is taken out (see FIG. 2).
The remaining portion of the picture-added sheet S having is conveyed to the winder US side and wound up when the next shot is supplied.

In the injection molding simultaneous painting method and apparatus of the present embodiment configured as described above, the painting sheet S
The trimming step of separating the part to be attached to the molded product from the other part of the molded article is performed immediately before the completion of the injection molding step after the stretching step of stretching the painted sheet S along the female mold cavity 13. Since it has been
In the trimming process, the painted sheet S is the female cavity surface 1
Since they are closely attached along 3 so that undesired behavior such as displacement and deformation does not occur anymore, and there is no concern about defective molding due to air leakage during vacuum suction or wraparound of injection resin. It will be done later, but before the extraction process begins.

As a result, there is no need for additional equipment or space for sheet trimming outside the molds 12 and 40, and
The drawing sheet can be brought into close contact with the cavity surface by vacuum suction or the like without taking special time for the trimming process, and wrinkles, breakage, misalignment, etc. can be less likely to occur. In addition, since the cutting blade 30 provided on the clamper 25 is used as the cutting means, the male and female gold bars 12, 4 are
It is possible to surely trim the painted sheet S without providing a special shearing blade, an edge, or the like on the 0-shaped die forming portion, and to reduce the cost of the device as much as possible. A tightening failure, a molding failure, etc. can be made less likely to occur and productivity can be effectively enhanced.

[0044]

According to the simultaneous injection-molding painting method and apparatus according to the present invention, no additional equipment or space for sheet trimming is required outside the mold, and a special time is taken for the trimming process. Without wrinkles, the painted sheet can be brought into close contact with the cavity surface by vacuum suction, etc.
Breakage, misalignment, wraparound between the injection resin painting sheet and the mold are less likely to occur, and painting is assured without the need for special shearing blades or edges on the mold forming parts of both male and female molds. An excellent effect that the sheet can be trimmed, the device cost can be suppressed as much as possible, and cutting defects, mold clamping defects, molding defects, etc. can be less likely to occur and productivity can be effectively improved. Play.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram showing an embodiment of an injection molding simultaneous painting apparatus according to the present invention.

FIG. 2 is an enlarged perspective view showing the periphery of a female mold cavity of the injection molding simultaneous painting apparatus of FIG.

FIG. 3 is an enlarged perspective view showing the configuration of a cutting blade of the injection molding simultaneous painting apparatus of FIG.

FIG. 4 is an enlarged cross-sectional view showing the vicinity of a connecting portion between a cutting blade and a clamper of the injection molding simultaneous painting apparatus of FIG.

FIG. 5 is a flowchart showing the sequence of steps of the injection molding simultaneous painting method according to the present invention.

FIG. 6 is a diagram which is used for explaining a clamping process, a sheet softening process and a sheet stretching process of the injection molding simultaneous painting method according to the present invention.

FIG. 7 is a diagram provided for explaining a sheet stretching step, a mold clamping step, and an injection molding step of the injection molding simultaneous painting method according to the present invention.

FIG. 8 is a diagram which is used for explaining an injection molding process and a trimming process of the simultaneous injection molding painting method according to the present invention.

FIG. 9 is an enlarged detailed view for explaining a trimming step of the injection molding simultaneous painting method according to the present invention.

FIG. 10 is a diagram which is used for explaining a mold opening step and a take-out step of the simultaneous injection molding painting method according to the present invention.

[Explanation of symbols]

 S ... Painting sheet 10 ... Injection molding simultaneous painting device 12 ... Female mold 13 ... Cavity (cavity surface) 17 ... Vacuum suction hole 20 ... Cutting mechanism 25 ... Clamper 27 ... Coil spring 30 ... Cutting blade 34 ... Insertion groove 40 ... Male mold 47 ... Fluid pressure cylinder 60 ... Hot platen

Claims (5)

[Claims] 1. A sheet supplying step of supplying a decorative sheet between a female mold and a male mold, a clamping step of fixing and holding the decorative sheet on a parting surface of the female mold, and a step of fixing the decorative sheet to the female mold. A drawing step of drawing along the cavity surface of the mold, a mold clamping step of moving one of the female mold and the male mold to the other side to perform mold clamping, and a flow from the male mold side into the female mold. An injection molding step of injecting and filling a resin in a state of injection and an injection molding step, a mold opening step of separating the female mold and the male mold, and a taking-out step of taking out an injection molded article to which a painting sheet is adhered from the female mold. In the injection molding simultaneous painting method, wherein each of the steps is performed in the order described or the order thereof is interchanged, sequentially, or a plurality of steps are performed simultaneously in an overlapping or parallel manner. Attached to the molded product The trimming step of separating the power portion from the other portion is performed after the stretching step and before the extracting step by a cutting means provided in a portion other than the female and male mold forming portions. Injection molding simultaneous painting method. 2. The injection molding simultaneous painting method according to claim 1, wherein the trimming step is performed after the injection molding step. 3. A portion of the painted sheet to be attached to a molded article within a period after the stretching step and before the extracting step, in order to carry out the injection molding simultaneous painting method according to claim 1. Injection molding simultaneous painting device provided with a cutting means capable of separating the resin from other parts. 4. The cutting means comprises an annular blade capable of enclosing the outer peripheral edge of the cavity surface of the female die, and is perpendicular to the painting sheet fixedly held on the parting surface of the female die. The simultaneous injection-molding painting device according to claim 3, wherein the device is adapted to be moved to the inside. 5. A clamp means for fixing and holding the picture-added sheet between the female parting surface and the female parting surface is provided, and the clamp means is provided with the cutting means. Item 3. An injection molding simultaneous painting device according to Item 3.