JP2001062867A - Method and apparatus for simultaneously injection molding and decorating - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate releasing or breaking of an excessive part of a decorated sheet particularly from the vicinity of an edge of an injection resin molding when opened at a mold by shortening the excessive part accompanied with the molding. SOLUTION: A decorated sheet S is adhesively integrated with an outer surface of an injection resin molding Pa. Since an excessive part Sb of the sheet for press fixing is cut by a disconnecting blade 42 at a part near a cavity 13, an attendant part Sb' accompanied with a molding P adhered and retained at a core 26 is released from a female mold 12 and retained at a male mold 25 side. In this case, since the part Sb' of the molding Pa is considerably shortened as compared with top to bottom and right to left lengths of the original part Sb for press fixing, the excessive part (the part Sb') of the sheet S does not interfere a clamper at all when opened at the mold. As a result, a problem such as releasing, breaking or the like of the sheet S particularly from the edge E of the molding P can be eliminated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a decorative laminated product (product) in which a painted sheet on which a pattern, a character or the like is applied in a mold at the same time as injection molding is integrally adhered and laminated on the surface of an injection resin molded product.
The present invention relates to an injection molding simultaneous painting apparatus which obtains the following.

[0002]

2. Description of the Related Art There have been proposed several methods for simultaneous injection molding and painting in which a painting sheet is integrally laminated and adhered to the surface of an injection resin molding at the same time as injection molding. Is to replace all or some of the following steps (a) to (i) in the order described or by changing the order,
Sequentially, or a plurality of steps are performed simultaneously or in parallel or in parallel (Japanese Patent Publication No. 50-19132,
See Japanese Utility Model Publication No. 3-56344 and Japanese Patent Publication No. 7-41637. (A) A sheet supplying step of supplying a picture sheet onto a female parting surface used for injection molding.

(B) A clamping step of fixing and holding the picture sheet on the female parting surface. (C) A heating softening step of heating and softening the painted sheet with a hot platen or the like. (D) A stretching step (preliminary molding step) of stretching the painted sheet along the female cavity by vacuum suction and / or air supply. (E) A mold clamping step of moving one of the female mold and the male mold (usually a female mold) to the other (usually a male mold) to clamp the mold.

(F) An injection molding step of injecting and filling a resin (molten resin) in a flowing state from the male mold into a cavity formed between the female mold and the male mold to perform injection molding. (G) A mold opening step of separating the female mold and the male mold. (H) A sheet trimming step of separating a portion of the painted sheet to be attached to the injection resin molded body from another portion (excess portion).

[0005] (i) A molded article removing step of taking out a laminated molded article on which a picture sheet is adhered and laminated from a female mold or a male mold and transporting the molded article outside. Simultaneously overlapping a plurality of steps means that a plurality of steps are included in one step. For example, in the mold clamping step (e), a painted sheet is placed between a female mold and a male mold. If it is not fixed and held, it means that the clamping step (b) is performed simultaneously with the mold clamping step, and the painted sheet is injected in the injection molding step (f). If the stretching is performed by the heat and pressure of the molten resin, this means that the stretching step (d) is performed simultaneously with the injection molding step.

[0006] As the painting sheet, either a laminated sheet (laminated sheet) or a transfer sheet is used depending on the product type. In the case of a laminated sheet, painting is performed as it is by injection molding. That is, all the layers of the sheet are bonded and integrated with the surface of the injection resin molded body to form a decorative layer. On the other hand, when the painting sheet is a transfer sheet, the support sheet of the painting sheet integrated with the surface of the injection resin molded body is peeled off, and only the transfer layer such as the decoration layer remains on the injection resin molding body side. Then, the painting is completed by forming a decorative layer.

[0007]

By the way, in the conventional simultaneous molding apparatus for injection molding, during the period from the completion of mold clamping to the start of mold opening, the clamper is normally movable (female) and fixed (male). During this period, the painted sheet is often kept pressed and fixed to the female parting surface by the clamper during the period. In this case, when the mold opening is started, the molded product in which the painting sheet is integrally bonded and laminated on the injection resin molded body solidified in the cavity usually remains in the male mold, and The portion pressed and fixed by the clamper (the outer peripheral portion that is not bonded and integrated with the solidified injection resin molded body) separates from the male mold as the female mold retreats. For this reason, as the female mold moves away from the male mold, the painted sheet comes into close contact with the clamper and is pulled together with the clamper in a direction in which it is peeled off from the molded product (injection resin molded product). In particular, problems such as peeling or breakage from the vicinity of the edge may occur. Such a defect is a fatal problem, especially when the painting sheet is a laminate sheet, since it directly leads to a product defect.

As shown in FIGS. 7 and 8, a male mold 25 having a cavity 13 and a parting surface 12a is selectively moved toward and away from the male mold 25 as shown in FIGS. The clamper 39 can be housed in a portion opposed to the rectangular frame-shaped clamper 39, and the clamper 39 can be accommodated in the clamped state.
Can perform a separating operation (a movement away from the painted sheet S as shown by a virtual line in the figure from the pressed and fixed state shown by the solid line in FIG. 8) to release the pressed and fixed state with respect to the painted sheet S. It has been proposed to provide a groove-shaped concave portion 29 having a sufficient height (Japanese Patent Laid-Open No. 6-315950).
Reference).

As described above, by providing the groove-shaped recess 29 in the male mold 25, the separating operation is performed by the clamper 39 in the groove-shaped recess 29 during the period from the time when the mold clamping is completed to the time when the mold opening is started. In this case, if the pressed and fixed state of the painting sheet S is released, the painting sheet S is free even if the mold is opened thereafter, so that the female mold 12 separates from the male mold 25. Then, the painted sheet S is separated from the female mold 12 and remains on the male mold 25 side, and the above-mentioned problem should be solved.

However, the male mold 25 is provided with the groove-shaped recess 29 as described above, and the clamper 39 is provided with the groove-shaped recess 2 during the period from the time when the mold clamping is completed to the time when the mold opening is started.
Even when the separating operation for releasing the press-fixed state with respect to the painting sheet S is performed in 9, when the female mold 12 separates from the male mold 25 after the mold opening is started, as shown in FIG. Pressing which is located between the rectangular frame-shaped clamper 39 and the parting surface 12a of the female die 12 on the outer peripheral side of the portion Sa of the painted sheet S which is adhesively integrated with the injection resin molded body Pa. The excess portion Sb for fixing is caught by the clamper 39 and does not rub through the lower side of the clamper 39 (the female mold 12 side) smoothly, but moves in a direction away from the male mold 25 with the female mold 12.
As a result, the adhesive integrated portion Sa (particularly, the portion located near the edge E of the molded product P) of the painted sheet S is strongly pulled toward the movable mold 12, and as a result, the painted sheet S
However, there has been a problem that the molded product P peels or breaks particularly from the vicinity of the edge portion E of the molded product P.

The above-described problem does not occur if the picture-fixed sheet is pressed and fixed by, for example, only vacuum suction without using the clamper as described above.
If a clamper is not used, there is a problem that poor vacuum suction (wrinkles, etc.) occurs during the above-described stretching step, and the misalignment of the picture sheet (decorative pattern) of the picture sheet and each part of the molded article tends to occur. Occurs.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and an object of the present invention is to make a surplus portion of a painted sheet catch on a clamper when the mold is opened, thereby causing the painted sheet to become a molded product. In particular, it is an object of the present invention to provide a method and apparatus for simultaneous painting by injection molding in which problems such as peeling or breakage from the vicinity of an edge portion do not occur.

[0013]

In order to achieve the above-mentioned object, a method for simultaneous painting by injection molding according to the present invention comprises a sheet supplying step of supplying a painted sheet on a female parting surface; A clamping step of pressing and fixing with a clamper on the female parting surface, a stretching step of stretching the painted sheet so as to adhere along the female parting surface, and One side is moved to the other side to perform mold clamping, a mold clamping step of forming a cavity between both molding dies, and a flowable resin is injected and filled in the cavity, and the obtained injection resin molded body and the painted sheet are obtained. An injection molding process of laminating and integrating
A mold opening step of separating the female mold and the male mold,
In the mold clamping step, a surplus portion of the painted sheet, which is cut off at a part on the outer peripheral side from the cavity and on the inner peripheral side from the clamper, at the time of the mold opening step, is attached to the injection resin molded body. Is characterized by being shortened.

[0014] Further, an injection molding simultaneous painting apparatus according to the present invention is for carrying out the above method, and comprises a female mold and a male mold which are arranged to face each other so that one can be moved to the other side. Sheet supply means for supplying a painted sheet onto the female parting surface; and a sheet supply means capable of moving the painted sheet in a direction orthogonal to the female parting surface. A clamper that presses and fixes the sheet, a vacuum suction unit that extends the painted sheet pressed and fixed by the clamper along the cavity of the female mold, and a cavity formed between the female mold and the male mold. Resin injection means for injecting and filling a resin in a fluid state from the male mold side.

[0015] The male and female molds are provided with cutting means for cutting a portion of the painting sheet on the outer peripheral side from the cavity and on the inner peripheral side from the clamper. I have. The cutting means includes a cutting blade formed of, for example, a projection having a sharp edge shape protruding from one of the male and female molds, and the other parting surface for accommodating the cutting blade. In addition to those formed with a concave groove formed in the hole, those formed of an electrothermal heating wire such as a push-cutting blade (shearing blade) or a dichrome wire can also be used.

[0016] In a preferred aspect of the apparatus of the present invention, the male and female molds are provided with a portion of the painting sheet, which is on the outer peripheral side of the cavity and on the inner peripheral side of a portion cut by the cutting means, on the female side. Sealing means is provided for pressing against the mold parting surfaces to seal between them. Examples of the sealing means include those having an O-ring mounted on the male or female parting surface.

Here, the cut portion of the painted sheet does not necessarily have to be the entire periphery of the cavity. That is, it is located on the outer peripheral side of the cavity and on the inner peripheral side of the clamper, and is attached to a molded product (injection resin molded product) that remains on the core portion of the male mold (fixed mold) when the mold is opened later. Of the painted sheet that is not bonded and integrated with the injection resin molded body, but the extra length for pressing and fixing connected to the bonded and integrated portion is long, and only the direction that is easy to catch on the clamper may be used. At least one of the right and left), and cut in a direction orthogonal to that direction.

As can be clearly understood from FIG. 6 (a plan view of the female mold 12), the picture sheet S immediately before the mold clamping is pressed and fixed on the parting surface 14 of the female mold 12 by the clamper 20, and The sheet is cut into single sheets, the downstream end of which is fixedly held by the fixed chuck 65 and the female mold 12 is cut.
Is stretched along the cavity 13 of
Usually, the length Lb downstream of the cavity 13 is the longest, and then the length La upstream of the cavity 13 is long, and the length Ls of the left and right sides of the cavity 13 is larger than them.
Since Ls is set to be even shorter, the priority order of the portion where the cutting means of the painted sheet S is provided is, first, the downstream side of the cavity 13 (reference numerals 32B and 42B in FIG. 6),
Next, the upstream side of the cavity 13 (32A in FIG.
42A) Finally, the left and right sides of the cavity 13 (not shown)
Becomes Further, the cutting means is provided with reference numerals 32 and 42 in FIG.
As a matter of course, it is of course possible to provide the entire surface of the cavity 13 so as to cut out the sheet S with a ring.

In the method and apparatus for simultaneous painting by injection molding according to the present invention having the above-described configuration, in the mold clamping step, the paint sheet is provided on the outer peripheral side of the cavity and on the inner peripheral side of the clamper. Cut the site,
At the time of the mold opening step, since the excess portion attached to the injection resin molded body is shortened, the excess portion of the painted sheet does not interfere with the clamper at the time of mold opening, or interferes with the clamper. However, since the amount of interference (amount of rubbing) is extremely small, it is possible to prevent problems such as peeling or breakage of the painted sheet particularly from near the edge of the molded product.

Further, the male and female molds are pressed against the female parting surface by pressing the part of the picture sheet, which is on the outer peripheral side from the cavity and on the inner peripheral side from the part cut by the cutting means, into the male part and the female part. By providing a sealing means such as an O-ring for sealing between them, even if the painted sheet is cut at a position on the outer peripheral side from the cavity and on the inner peripheral side from the clamper, vacuum leakage occurs during injection molding. (Air invades between the cavity and the painted sheet), etc. does not occur, and vacuum suction failure (wrinkles, etc.) occurs, or the misalignment of the picture (decorative pattern) of the painted sheet and each part of the molded article with the painted sheet. Can be prevented.

In the present invention, the male and female molds are made of metal such as iron or ceramics, and are provided with small holes (vacuum suction holes or the like) for vacuum suction or compressed air supply as required. Further, the female mold is constituted by an aggregate of a plurality of divided parts (in a so-called nested structure), a slit-shaped gap is formed between adjacent divided parts, and this gap is used as a vacuum suction hole (and a compressed air supply hole). Alternatively, vacuum suction (and air blow) may be performed.

The male mold is provided with a runner for injecting the resin in a flowing state and a required gate. The number, position, shape and the like of the gates can be freely set in consideration of the shape and the like of the product to be obtained. Further, it is preferable that the male mold is provided with an ejector pin for separating the laminated molded product adhered thereto, or a laminated product separating means such as a pressurized air jetting means.

In addition, a clamping means is provided for fixing and holding the painting sheet on the female parting surface. As the clamping means, those having a frame shape or a cross beam shape in plan view can be used (see FIG. 5 or FIG. 6). In order to move the clamp means forward and backward with respect to the female parting surface, a molding drive force such as a mold clamping operation can be used, and a separate drive means such as a fluid pressure actuator is provided.

In the apparatus of the present invention, preferably, the painting sheet is formed by unwinding a roll obtained by winding a long strip-shaped sheet from an unwinding machine and supplying the unrolled sheet to both the male and female dies. The painted sheet unwound from the machine is cut into single-shot sheets one shot upstream of the clamping means. Therefore, a sheet cutting means for cutting the painted sheet in the width direction is provided near the upstream end of the female die as viewed in the sheet supply direction. As the sheet cutting means, various types such as a cutting blade (cutter), an electrothermal heating wire such as a nichrome wire, an ultrasonic cutter, and a shearing machine can be used. In the case of small-lot production, a method may be employed in which a single sheet of a pre-painted sheet is supplied between the male and female molds one by one.

Further, the apparatus of the present invention is preferably provided with a hot plate for performing preforming. As the hot plate, any of a contact heating system using conduction heat and a non-contact heating system using radiant heat or dielectric heating may be adopted. Further, the hot plate may be provided with sheet cutting means for cutting the painted sheet in the width direction. As the sheet cutting means, a heating wire made of a heating wire such as a cutting blade or a nichrome wire can be used.

The painting sheet is composed of a base sheet and a decorative layer laminated thereon, and is a laminated sheet (laminated sheet) used as a final product while keeping the base sheet in close contact with the molded product, or Once the painted sheet and the molded article are integrated, any transfer sheet that peels off the substrate sheet (support sheet) while leaving only the decorative layer (transfer layer) on the molded article side can be used. The present invention provides a greater advantage, especially when a laminate sheet is used.

In the case of the laminated sheet, a thermoplastic resin such as polyolefin resin such as polyethylene and polypropylene, polyvinyl chloride, acrylic resin, polystyrene, ABS resin, polycarbonate resin and polyester resin is used as the base sheet. Can be. The thickness of the base sheet is usually about 20 to 500 μm. As the decorative layer, a printed pattern, colored or transparent coating, a metal thin film, or a functional layer such as a hard coating film, an antifogging paint, or a conductive layer can be used.

In the case of the transfer sheet, it is for transferring a transfer layer composed of a pattern layer or the like once formed on a releasable support sheet to another transfer target, and is not necessary on the support sheet. A release layer may be provided according to the conditions, and the transfer layer includes a release layer, a decorative layer, an adhesive layer, and the like, and layers other than the decorative layer are selected as necessary. The decorative layer is selected from a pattern layer, a metal thin film layer (part or entire surface) or a functional layer such as a hard coating film, an anti-fog coating film, or a conductive layer. The support sheet is preferably a flexible thermoplastic resin film such as a polyamide resin such as nylon 6 or nylon 66, a polyolefin resin such as polyethylene or polypropylene, or polyvinyl chloride, or a laminate thereof.

As the resin for injection molding, ABS (acrylonitrile-butadiene-styrene copolymer) resin,
Thermoplastic resins such as polystyrene, polyvinyl chloride, acrylic resin, and polycarbonate resin that have been heated and melted to be in a liquid or fluid state, or two-pack curable and catalyst-curable resins such as urethane resins and polyester resins For example, an uncured liquid, such as uncured liquid, can be made of a material that is conventionally known for simultaneous painting with injection molding, and is selected according to the required physical properties of the product, cost, and the like.

[0030]

Embodiments of the present invention will be described below in detail with reference to the drawings. 1 to 4 and 5 are an overall schematic longitudinal sectional view and a female mold plan view showing a typical embodiment of the simultaneous injection molding and painting apparatus according to the present invention.

The laminated product to be obtained by the simultaneous injection molding painting apparatus 10 of this embodiment is a panel having a rectangular shape and a U-shaped cross section in plan view, and a painting sheet S is adhered and laminated on the surface of the injection resin molded body. Things. Here, as the above-mentioned painted sheet S, a base sheet made of acrylic resin (having a thickness of 125 μm) and a decorative layer (one of acrylic resin and vinyl chloride-vinyl acetate copolymer) laminated thereon by a gravure printing method are used. : 1 weight ratio mixture of binder and red stencil, picture layer of ink composed of pigment mainly composed of carbon black) and adhesive layer (vinyl chloride-vinyl acetate copolymer system)
And a laminated sheet (laminated sheet) used as a final product while the base sheet is tightly integrated with the injection resin molded article.

Injection molding simultaneous painting apparatus 10 of this embodiment
Is provided with a female mold 12 and a male mold 25 each having an uneven shape corresponding to the above-mentioned laminated product to be obtained. The female mold 12 has a bottom portion fixed to a movable plate (not shown), The ram or the like of the cylinder moves forward and backward in a horizontal direction (X direction in FIG. 1), in other words, in a direction approaching and separating from the male mold 25.

In the present embodiment, the female mold 12 is movable and moves in the horizontal direction as described above. However, the present invention is not limited to this. It is also possible to adopt a mode in which the female molds are vertically opposed and one of them is moved in the vertical direction. Here, the female die 12 has a nested structure composed of a plurality of split dies, and a slit-shaped gap 1 is provided between the split dies.
The space 5 is formed so as to perform vacuum suction using the gap 15 as a vacuum suction hole as described later.

A cavity 13 corresponding to the laminated product 1 is formed in the female mold 12, and an inner peripheral parting surface 14a is formed on the outer peripheral side of the cavity 13.
A parting surface 14 composed of an intermediate inclined parting surface 14b and an outer parting surface 14c is formed, and is located near the cavity 13 of the inner parting surface 14a of the parting surface 14 so as to surround the cavity 13. An annular sheet suction groove 16 for vacuum suction of the painting sheet S is formed, and a predetermined number of vacuum suction holes 17 are opened in the sheet suction groove 16 at a predetermined pitch.

The vacuum suction hole 17 is connected to an external vacuum pump through a vacuum suction passage 18 and a conduit formed in the female die 12. In the present embodiment, the vacuum suction hole 17 is formed between the split dies. The slit-shaped gap 15, the sheet suction groove 16, and the sheet suction groove 16 which communicate the upper portion of the corner of the cavity 13 with the vacuum suction passage 18.
A vacuum suction means is constituted by the vacuum suction hole 17, the vacuum suction passage 18, the conduit, an external vacuum pump, and the like, which are opened at the bottom.

Further, the parting surface 1 of the female mold 12
4 is provided on the outer parting surface 14c.
An O-ring mounting groove 23 is formed so as to surround 3, and an O-ring 22 is mounted in the mounting groove 23.
The O-ring 22 hermetically shuts off the cavity 12 from the outside when a later-described frame-shaped frame-shaped clamper 20 is pressed against the parting surface 14 of the female mold 12 with the painting sheet S interposed therebetween. Play a role.

The female mold 12 is provided with a rectangular frame-shaped or cross-girder-shaped clamper 20 for pressing and fixing the supplied one-shot painting sheet S on the parting surface 14. ing. This clamper 20
Through four sliding rods 24 (FIG. 1) connected to the four corners, driving means can move forward and backward in the direction perpendicular to the parting surface 14 (X direction in the figure).

Here, the painted sheet S is supplied to the parting surface 14 of the female die 12 by sheet supply means such as a transport chuck (not shown), and the downstream end thereof is fixedly held by the fixed chuck 65 (FIG. 5). Subsequently, the sheet is pressed and fixed to the parting surface 14 by the clamper 20 and further provided on the upper end of the hot platen 70 (near the upstream end of the female die 12 as viewed in the supply direction of the painting sheet S) described later. The sheet is cut in the width direction by the cutter 80, and cut into single shot sheets. Further, a hot platen 70 is provided to heat and soften the picture sheet S pressed and fixed to the parting surface 14 by the clamper 20.

The hot platen 70 is moved by a hot platen transfer means (not shown) from a standby position outside the male and female molds to an opposed heating position therebetween (on the parting surface 14 of the female mold 12) (FIG. 2). ), And at this opposed heating position, the painted sheet S is heated and softened by radiant heat in a non-contact state. In the example of FIG. 2, the hot platen 70 is a non-contact heating method using infrared radiation, but may be a contact heating method using heat conduction by bringing the hot plate 70 into contact with a painted sheet.

On the other hand, although not shown, the male mold 25 is fixed to a fixed plate on which a nozzle of an injection molding machine is mounted, and as shown in FIG.
A convex core portion 26 corresponding to the molded product P and a parting surface 41 corresponding to the female parting surface 14 are provided, and a runner 27 for injecting a molten resin, and a columnar shape connected thereto are provided therein. Gate 28 is provided.

The parting surface 41 of the male mold 25 is provided with cutting means for cutting a portion of the painted sheet S on the outer peripheral side from the cavity 13 and on the inner peripheral side from the clamper 20 in a ring shape. An annular cutting blade 42 having a sharp edge protruding shape is provided, and an annular concave groove 32 having a rectangular cross section is formed in the parting surface 14 of the female die 12 to accommodate the cutting blade 42. .

Further, on the parting surface 41 of the male mold 25, on the inner peripheral side of the cutting blade 42, the female mold 1 is located.
In the outer side of the second vacuum suction groove 16, a portion of the above-mentioned painted sheet S, which is on the inner side of the portion cut by the cutting means on the outer side of the cavity 13, is set to the female parting surface 14. There is provided a mounting groove 45 in which an O-ring 44 as a sealing means for pressing and sealing between them is mounted.

In the apparatus 10 of this embodiment having such a configuration, when performing simultaneous injection-molding painting, first, a portion between the parting surface 14 of the female mold 12 and the clamper 20 is provided by the sheet feeding means. Is supplied with one shot of the painting sheet S. More specifically, for example, the upstream end of the elongated belt-shaped picture sheet S unwound from the unwinder via the feed roll when viewed in the conveyance direction of the picture sheet S in the female die 12 by the conveyance chuck. (The upper end) is gripped and pulled to the vicinity of the downstream end of the female die 12, and is conveyed. The front end of the picture sheet S conveyed by the conveyance chuck is received and fixed by the receiving and fixing chuck 65. . At this time, a predetermined tension is applied to the painting sheet S, and the painting sheet S is arranged on the parting surface 14 in a state of being stretched (see FIG. 1).

Subsequently, the clamper 20 is advanced to the parting surface 14 side, and the supplied painting sheet S is pressed and fixed on the parting surface 14 by the sheet pressing surface portion 20a of the clamper 20, and 70,
Pictured sheet S pressed and fixed by clamper 20
It is moved upward to soften the painted sheet S, and the painted sheet is cut in the width direction near the upper end of the female die 12 by a sheet cutter 80 provided on the hot platen 70, so that one shot worth A leaf sheet, followed by the above-described vacuum suction groove 16, vacuum suction hole 17, and vacuum suction gap 15
Perform vacuum suction by vacuum suction means composed of
The painted sheet S is stretched so as to be in close contact with the female mold cavity 13 (the state of FIG. 2).

Thereafter, as shown in FIG.
2 is moved to the male mold 25 side, and the male mold 25 and the female mold 12 are clamped. At the time of this mold clamping, the cutting blade 42 provided on the male mold 25 is inserted into the concave groove 32 provided on the female mold 12.
When entering, the portion of the painted sheet S on the outer peripheral side from the cavity 13 and on the inner peripheral side from the clamper 20 is cut along the entire circumference, and the male mold 25 is cut.
The O-ring 44 provided on the outer peripheral side of the cavity 13 of the painting sheet S makes the cutting blade 4
The part on the inner peripheral side of the part to be cut by 2 is pressed against the female parting surface 14 and the space between them is sealed.

In this state, the molten resin Pa ′ from the injection molding machine is supplied from the runner 27 through the main gate 28.
The molding cavity 9 (product molding section) formed by the female mold cavity 13 and the core portion 26 is injection-filled. The molten resin Pa ′ thus injected and filled into the molding cavity 9 in this manner.
After solidification, the female mold 12 and the male mold 25 are opened. At the time of opening the mold, as shown in FIG. 4, the painted sheet S is bonded and integrated (the bonded integrated portion Sa) to the outer surface of the solidified injection resin molded body Pa. Among them, the surplus portion Sb for pressing and fixing, which is not bonded and integrated with the injection resin molded body Pa, on the outer peripheral side from the cavity 13, is cut into a ring shape by the cutting blade 42 at a portion close to the cavity 13. ing.

Therefore, when the mold is opened to separate the female mold 12 from the male mold 25, the excess (injected resin molded body Pa) P adheres to the core part 26 of the male mold 25 and the excess The bonding integrated portion Sa of the portion Sb
Are separated from the female mold 12 and separated from the male mold 2
Remain on the 5th side.

In this case, the accompanying portion Sb 'attached to the injection resin molded body Pa is the top and bottom left and right lengths (La, Lb, L) of the original press-fixing surplus portion Sb.
s, Ls), the surplus portion (the accompanying portion Sb ′) of the painted sheet s does not interfere with the clamper 20 at the time of opening the mold. It is possible to prevent a problem such as peeling or breakage from the vicinity of E from occurring.

The male mold 25 and the female mold 12 are provided with a portion of the painted sheet S on the outer peripheral side of the cavity 13 and on the inner peripheral side of the portion cut by the cutting blade 42. By providing a sealing means including an O-ring 44 that presses against the parting surface 14 to seal between them, the painted sheet S is located on the outer peripheral side of the cavity 13 and on the inner peripheral side of the clamper 20. Even when cutting is performed, there is no occurrence of vacuum leakage (air enters between the cavity and the painted sheet) at the time of injection molding, etc., resulting in poor vacuum suction (wrinkles, etc.), and the picture of the painted sheet (decorative pattern)
Displacement of the painted sheet between the sheet and each part of the molded article can be prevented.

[0050]

As will be understood from the above description, according to the simultaneous painting method and apparatus for injection molding according to the present invention, in the mold clamping step, the clamper is provided on the outer peripheral side of the cavity in the painted sheet. By cutting the portion on the inner peripheral side more, the excess portion attached to the injection resin molded body is shortened at the time of the mold opening step, so that the excess portion of the painted sheet is completely attached to the clamper at the time of opening the mold. It does not interfere, or even if it interferes with the clamper, the amount of interference (the amount of rubbing) is extremely small, so that the painted sheet may peel off or break from the molded product, especially near the edge. Can be prevented from occurring.

Further, the male and female molds are pressed against the female parting surface by pressing the part of the picture sheet, which is on the outer peripheral side from the cavity and on the inner peripheral side from the part cut by the cutting means, into the male part and the female part. By providing a sealing means such as an O-ring for sealing between them, even if the painted sheet is cut at a position on the outer peripheral side from the cavity and on the inner peripheral side from the clamper, vacuum leakage occurs during injection molding. (Air invades between the cavity and the painted sheet), etc. does not occur, and vacuum suction failure (wrinkles, etc.) occurs, or the misalignment of the picture (decorative pattern) of the painted sheet and each part of the molded article with the painted sheet. Can be prevented.

[Brief description of the drawings]

FIG. 1 is a partial schematic longitudinal sectional view showing a female die of one embodiment of an injection molding simultaneous painting apparatus according to the present invention.

FIG. 2 is a partial schematic longitudinal sectional view for explaining a stretching step and a heat softening step of the apparatus shown in FIG.

FIG. 3 is a partial schematic longitudinal sectional view used for explaining a mold clamping step and an injection molding step of the apparatus shown in FIG. 1;

FIG. 4 is a partial schematic longitudinal sectional view for explaining a mold opening step of the apparatus shown in FIG. 1;

FIG. 5 is a schematic plan view of a female mold of the device shown in FIG. 1;

FIG. 6 is a schematic longitudinal sectional view for explaining a mold opening step of the apparatus shown in FIG. 1;

FIG. 7 is a partial cross-sectional view showing an example of a conventional simultaneous injection molding painting apparatus.

FIG. 8 is an enlarged partial sectional view showing an example of a conventional simultaneous injection molding painting apparatus.

[Explanation of symbols]

 S Painting sheet (laminated sheet) 10 Injection molding simultaneous painting apparatus 12 Female mold 13 Cavity 14 Parting surface 15 Vacuum suction hole 16 Vacuum suction groove 20 Clamper 25 Male mold 42 Cutting blade 32 Concave groove 44 O-ring

Claims (5)

[Claims] 1. A sheet supply step of supplying a painted sheet on a female parting surface, a clamping step of pressing and fixing the painted sheet on the female parting surface with a clamper, A stretching step of stretching so as to adhere along the parting surface of the female mold, and moving the one of the female mold and the male mold to the other side to perform mold clamping, thereby forming a cavity between the two molds. Fastening process,
Injecting and filling a resin in a fluid state into the cavity, an injection molding step of laminating and integrating the obtained injection resin molded body and the painted sheet, and a mold opening step of separating the female mold and the male mold, In the mold clamping step, a portion of the painted sheet, on the outer peripheral side from the cavity and on the inner peripheral side from the clamper, is cut and attached to the injection resin molded body during the mold opening step. A simultaneous injection molding painting method, characterized by shortening a surplus part to be squeezed. 2. A simultaneous injection molding apparatus for carrying out the method according to claim 1, comprising a female mold and a male mold arranged opposite to each other so that one can be moved to the other side. Sheet supply means for supplying a painted sheet onto the female parting surface; and a sheet supply means capable of moving the painted sheet in a direction orthogonal to the female parting surface. A clamper that presses and fixes the sheet, a vacuum suction unit that extends the painted sheet pressed and fixed by the clamper along the cavity of the female mold, and a cavity formed between the female mold and the male mold. Resin injection means for injecting and filling a resin in a flow state from the male mold side, wherein the male mold and the female mold have an outer periphery than the cavity and an inner periphery of the clamper in the painted sheet. Foil-decorating injection molding apparatus is cutting means for cutting the portions, characterized in that it is provided. 3. The cutting means is provided with a cutting blade protruding from one of the male and female molds on a parting surface, and a cutting blade formed on the other parting surface to accommodate the cutting blade. 3. The simultaneous injection molding and painting apparatus according to claim 2, wherein the apparatus comprises a concave groove. 4. A male part and a female part are pressed against the female parting surface by pressing a part of the painted sheet, which is on the outer peripheral side from the cavity and on the inner peripheral side with respect to the part cut by the cutting means. The simultaneous injection molding and painting apparatus according to claim 2 or 3, further comprising a sealing means for sealing between them. 5. The simultaneous injection-molding and painting apparatus according to claim 4, wherein the sealing means has an O-ring mounted on the male or female parting surface.