JPH11240039A - Method and device for in-mold decoration injection molding - Google Patents

Abstract

PROBLEM TO BE SOLVED: To avoid effectively the contact and interference between a hot platen and a female mold, a clamper or the like when the hot platen is moved forward and backward between a standby position and an opposite heating position, carry out the heat softening process properly, and reduce the heat development energy and the heat softening process as much as possible. SOLUTION: A parting face of a female mold 12 is formed into almost a protruded curved face, and a hot platen 70 is provided with a first plate-shaped heating section 71 and a second plate-shaped heating section 72 connected together rotatably so as to form the angle of aperture required by both of them and an angle adjusting means 80 for setting the angle of aperture between the first plate-shaped heating section 70 and the second plate-shaped heating section 72 at 180 deg. when the hot platen 70 is moved forward and backward between the standby position and the opposite heating position, while the angle of aperture is reduced so that the first plate-shaped heating section 71 and the second plate-shaped heating section 72 are positioned along a parting face 14 of the female mold 12 in the case when the hot platen 70 is on the opposite heating position.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an injection molding method in which a painted sheet is integrally adhered to the surface of an injection molded resin article in a mold at the same time as injection molding to obtain a molded article on which patterns, characters, etc. are applied. BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a simultaneous painting apparatus and method, and more particularly, to an improved hot plate used to heat and soften a painted sheet before stretching (preforming) the painted sheet effectively.

[0002]

2. Description of the Related Art Several methods have been proposed for simultaneous injection molding and painting methods in which a painting sheet is integrally adhered to the surface of an injection resin molded article simultaneously with injection molding.
Most of them are arranged so that all or some of the following steps (a) to (i) are performed in the stated order or permuted, and the steps are sequentially performed or a plurality of steps are simultaneously performed in parallel or in parallel. (Japanese Patent Publication No. 50-19132, Jitsuhei 3
-56344, JP-B-7-41637, etc.).

(A) A sheet supply step of supplying a picture sheet onto a female parting surface used for injection molding. (B) a clamping step of fixing and holding the painted 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 (a molten resin or the like) in a fluid state from the male mold side into a cavity formed between the female mold and the male mold, solidifying the resin, and performing 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). (I) A take-out step of taking out the laminated product on which the painted sheet is adhesively laminated from both the male and female molds.

[0004] The simultaneous execution of a plurality of steps means that a plurality of steps are included in one step. For example, in the mold clamping step (e), the painted sheet is divided into a female type and a male type. If it is not fixed and held between them, the clamping step (b) is performed simultaneously with the mold clamping step, and the painted sheet is used in the injection molding step (f). If the stretching is performed by the heat and pressure of the injected molten resin, this means that the stretching step (d) is performed simultaneously with the injection molding step.

[0005] As the painting sheet, either a laminated sheet (laminated sheet) or a transfer sheet is used in accordance with 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.

[0006]

Incidentally, the simultaneous injection molding painting apparatus is usually provided with a hot platen for performing the heating and softening step (c) described above. When the female parting surface is flat, a flat plate type is used. For example, the hot plate is disclosed in Japanese Patent Application No. 9-336000 related to the earlier application of the present applicant. As described above, in an injection molding simultaneous painting apparatus provided with a female die having a parting surface which is a substantially convex curved surface, as shown in the above-mentioned publication, the respective parts of the painting sheet are evenly distributed. Since heating and softening are required, the heating of the painting sheet and the hot platen should be performed along the parting surface (the painting sheet pressed and fixed by a clamper) on the curved surface having a substantially convex shape. It is desirable to use a hot plate (heating portion) having a substantially "L" shape in a side view so that the separation distance from the surface is uniform.

[0007] However, the side view schematic "ku" as described above.
When a letter-shaped hot plate is used, the following problem may occur. In other words, the hot plate in a side view schematically `` C '' shape is retracted to the standby position outside the female mold by the hot plate advance / retreat means such as an air cylinder when the sheet with the picture is not heated,
When heating the painted sheet, the sheet is advanced from the standby position to the opposed heating position on the female mold cavity.
The 盤 -shaped hot plate in a side view has a very large occupied space compared to a normal flat hot plate, so that the hot plate can be moved back and forth between the standby position and the opposed heating position. At this time, contact and interference easily occur with the female mold, the clamper, or the protrusions, devices, wiring, piping, etc. existing around the female mold. Conversely speaking, the passage space (passage cross-sectional area) required for the movement of the approximately "L" -shaped hot plate in a side view between the standby position and the opposed heating position becomes extremely large, so Large restrictions will be imposed on the layout of the equipment, wiring, piping, etc. to be installed,
The degree of freedom of design, space efficiency, and work efficiency decrease.

In this case, if the opposed heating position of the hot platen is set at a position further away from the female mold, contact and contact of the hot platen can be achieved.
Although interference accidents can be prevented, doing so will increase the distance between the painted sheet and the heating surface of the hot platen, making it necessary to increase the heat generation energy (power consumption) of the hot platen and the heating softening time. It is not a good solution in terms of molding cost and molding cycle.

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-described problems. It is an object of the present invention to provide a hot platen which can be moved back and forth between a standby position and a facing heating position. Injection that can effectively avoid contact and interference with the mold, female mold, clamper, etc., perform the heating softening process properly, and reduce the heat energy of the hot platen and the heating softening time as much as possible. An object of the present invention is to provide a simultaneous painting apparatus.

[0010]

SUMMARY OF THE INVENTION In order to achieve the above-mentioned objects, the simultaneous injection-molding apparatuses according to the present invention are basically arranged so as to face each other so that one can be moved to the other side. Female and male molds, clamp means for being movable in a direction perpendicular to the female parting surface, and pressing and fixing the picture sheet on the female parting face; and A heating plate for heating and softening, when the painting sheet is not heated, the heating plate is retracted to a standby position outside the female die, and when the painting sheet is heated, the heating plate is moved from the standby position to an opposed heating position on the cavity of the female die. A hot plate advancing / retracting drive means for moving forward; and a resin injection means for injecting and filling a resin in a flowing state from the male mold side into the female mold cavity.

The female parting surface is a generally convex curved surface, and the hot plates are rotatably connected to each other so as to have a required opening angle. When the hot platen is moved back and forth between the standby position and the opposed heating position, the first plate-like heating unit and the second plate-like heating unit When the hot platen is at the opposed heating position, the first plate-shaped heating portion and the second plate-shaped heating portion are along the female parting surface when the opening angle with the portion is 180 degrees. Opening angle adjusting means for reducing the opening angle as described above.

The hot platen according to the present invention may employ either a contact heating method using conduction heat or a non-contact heating method using radiant heat or dielectric heating. In this case, heating is performed by a non-contact heating method according to the method described above. The hot plate advance / retreat driving means may employ various forms such as a fluid pressure cylinder such as an air cylinder, a linear transfer mechanism using a rack and pinion, and a bogie mechanism running on a guide rail.

[0013] In the simultaneous injection molding and painting apparatus according to the present invention having the above-described structure, the opening angle between the first plate-shaped heating section and the second plate-shaped heating section is adjusted by the opening angle adjusting means. When the hot platen is moved back and forth between the standby position and the opposing heating position, the angle is set to 180 degrees. When the hot platen is at the opposing heating position, the first plate-shaped heating unit and the second plate-shaped heating unit are connected to the female plate. The opening angle is set to 180 so as to be along the parting surface of the mold, that is, so as to have a substantially “C” shape in side view.
It is reduced from the degree.

More specifically, the first plate-shaped heating unit and the second plate-shaped heating unit in the hot platen are set to 1 when the hot platen advances and retreats.
As a single-plate shape opened at 80 degrees, the occupied space in the thickness direction of the entire hot plate is reduced, and the cross section is adjusted to the "C" shape along the convexly curved parting surface on the female mold cavity. With this configuration, when the hot platen advances and retreats, a large space is formed between the female plate, the clamper, and the like, and particularly the outer peripheral portion side of the first and second plate-shaped heating portions formed as a single plate. Since a space is formed, an accident in which the hot platen (the first plate-shaped heating portion, the second plate-shaped heating portion, and the like) contacts and interferes with the female mold, the clamper, and the like hardly occurs.

A passage space (passage cross-sectional area) required for the hot platen to move between the standby position and the opposed heating position.
Can be reduced to the minimum necessary size, so that interference between the hot plate and various devices, wiring, piping, etc. disposed around the female die can be effectively avoided, and such devices and The degree of freedom in layout and design of wiring, piping, etc. is increased, and space efficiency and work efficiency are improved. Furthermore, since it is not necessary to increase the separation distance between the plate-shaped heating part of the hot platen and the female mold, etc., it is possible to reduce the heat energy of the hot platen and the heat softening time, and to suppress the increase in the molding cost and the molding cycle. it can. In the present invention, the male and female molds are made of metal such as iron or ceramics or the like, and small holes (e.g., vacuum suction holes) for vacuum suction or supply of compressed air as necessary.
Is provided.

Further, the female mold is composed of an aggregate of a plurality of divided parts (in a so-called nested structure), and a slit-like gap is formed between adjacent divided parts, and this gap is used as a vacuum suction hole for vacuum suction. 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, in order to fix and hold the painting sheet on the female parting surface, a clamping means having a pressing surface shape corresponding to the female parting surface is provided. As the clamping means, a frame-shaped holding plate or the like can be used, and the driving thereof can use a molding driving force such as a mold clamping operation or the power of an ejector pin driving mechanism. This is achieved by separately providing a driving means such as a fluid pressure actuator.

The painting sheet is composed of a base sheet and a decorative layer laminated thereon, and is used as a final laminated product (laminate sheet) which is used as a final product while the base sheet is in close contact with a molded product. 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.

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 made of nylon 6, nylon 6
A flexible thermoplastic resin film such as a polyamide resin such as No. 6 or the like, a polyolefin resin such as polyethylene or polypropylene, polyvinyl chloride or the like, or a laminate thereof is preferable. The resin for injection molding is a liquid or fluid state obtained by heating and melting a thermoplastic resin such as ABS (acrylonitrile-butadiene-styrene copolymer) resin, polystyrene, polyvinyl chloride, acrylic resin, polycarbonate resin, etc. Or, a two-part curing type, a catalyst-curing type resin, for example, a material conventionally known for painting simultaneously with injection molding such as an uncured liquid such as a urethane resin or a polyester resin can be used, and the required physical properties and It is selected according to cost etc.

[0022]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is an overall configuration diagram showing an embodiment of an injection molding simultaneous painting apparatus according to the present invention, and FIG.
FIG. 3 is a perspective view showing a female mold peripheral part, FIG. 3 is a plan view showing the female mold peripheral part, and FIG. 4 is a schematic enlarged view of a portion viewed from an arrow A in FIG. The injection molding simultaneous painting apparatus 10 of the present embodiment includes a female mold 12 and a male mold 25 as can be clearly understood by referring to FIGS. 12 and 13 showing a clamped state in addition to FIGS. The female mold 12 has its bottom fixed to a movable platen (platen) 11 and is horizontally moved by a ram 9 of a fluid pressure cylinder, in other words, in a direction approaching and separating from the male mold 25 (Y
Direction).

In the present embodiment, the female die 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.

The female mold 12 has a nested structure composed of a plurality of split molds.
2 is formed with a relatively shallow side view generally “C” shaped cavity 13 corresponding to the laminate to be obtained,
A parting surface 14 is formed on the outer peripheral side of the cavity 13. This parting surface 14 is shown in FIGS.
In addition to FIGS. 10 and 11, in addition, as can be understood, a stepped parting surface including an outer parting surface 14a and an inner parting surface 14b stepped down from the parting surface is provided. Outer parting surface 14
a and the inner peripheral side parting surface 14b are both male molds 25.
It has a substantially convex (mountain-like) curved surface projecting toward the side (Y direction).

Then, around the cavity 13 on the parting surface 14 (the inner peripheral parting surface 14b), an annular continuous rectangular cross-section sheet for vacuum suction of the painting sheet S so as to surround the cavity 13 A fixing suction groove 16 is formed, and a predetermined number of vacuum suction holes 17 are opened in the sheet fixing suction groove 16 at a predetermined pitch (see FIG. 3).

A slit-like gap 15 serving as a vacuum suction hole is formed between the split dies of the female die 12. The slit-shaped gap 15 is opened at a boundary between a rounded corner (R) forming a corner of the cavity 13 and a plane part following the corner, and
It is connected to the vacuum suction hole 17. The reason why the slit-shaped gap 15 is opened at the boundary part is that the boundary part is the gap 1 used as a vacuum suction hole.
This is because traces of the filaments left on the laminate due to the presence of No. 5 are the least noticeable.

A vacuum suction hole 17 opened in the sheet fixing suction groove 16 and the slit-shaped gap 15 are connected to the outside through a vacuum suction passage 18 and a conduit 19 formed in the female die 12. In this embodiment, the vacuum suction holes 17, the sheet fixing suction grooves 16, the slit-shaped gaps 15, the vacuum suction passages 18, the conduits 19, and an external vacuum pump are connected. (Not shown) and the like constitute a vacuum suction means.

Further, an annular mounting groove 23 in which an O-ring 22 is mounted is provided in an inner peripheral portion of the outer peripheral parting surface 14a of the female die 12. The O-ring 22
When the frame-shaped clamper 20 which is curved in a substantially “C” shape described below is pressed against the outer peripheral parting surface 14a of the female mold 12 with the painting sheet S interposed therebetween, the cavity 12 and the outside are It serves to airtightly shut off the air.

On the other hand, the male mold 25 is provided with an injection molding machine 32.
The male die 25 is fixed to a fixed platen 31 on which the nozzle of FIG. 1 is mounted, and has a core portion 33 corresponding to the shape of the laminated product to be obtained and a parting recessed in a "C" shape in side view. A surface 34 is provided, and a forked runner 27 for injecting and filling the molten resin P (FIG. 13) into the cavity 13 and two gates 28 connected to the runner 27 are provided therein.

The female mold 12 has a rectangular frame-like front view, similar to the parting surface 14a, for pressing and fixing the painting sheet S to the outer peripheral parting surface 14a of the female mold 12. A clamper 20 having a substantially "L" shape is attached. The clamper 20 is vertically moved with respect to the female mold 12 by a driving mechanism (not shown) by four connecting rods 24 slidably fitted in through holes provided near four corners of the female mold 12. It can move. The male mold 25 is provided with a notch recess 29 having a depth capable of performing a separating operation for releasing the pressing and fixing state of the clamper 20 against the painting sheet S in a clamped state as shown in FIG. Have been.

The laminated product to be obtained by the simultaneous painting apparatus for injection molding 10 of the present embodiment is a panel having a rectangular shape in a plan view and a cross section having a substantially “く” shape. Here, an acrylic resin base sheet (having a thickness of 125 μm), a decoration layer (a 1: 1 weight ratio mixture of acrylic resin and vinyl chloride-vinyl acetate copolymer) laminated thereon by a gravure printing method, A laminated sheet (laminate sheet), which is used as a final product while having an adhesive layer (vinyl chloride-vinyl acetate copolymer system) closely adhered to the base material sheet and the injection molded resin Pa, is used. The decorative layer (pattern layer) has a wood grain pattern formed by combining three colors of a pattern plate, and the adhesive layer has a gravure solid printing plate (screen depth of 60 μm) having a screen ruling of 40 lines / cm. Using (Gravure printing 2
This is a layer having a thickness of 2 μm formed by color printing.

In addition to the female mold 12 and male mold 25 described above,
The simultaneous injection molding painting apparatus 10 of the present embodiment includes a sheet supply apparatus 5 that supplies a painting sheet S onto the parting surface 14 of the female mold 12. The sheet feeding device 5 is mounted on the support frame 1 installed on the left side of the female mold 12 in a side view (FIG.
Base frame 6 arranged to be able to advance and retreat along
The base frame 6 is connected and fixed to the movable platen 11 by a connecting member 7. As shown in FIG. 2, a pair of left and right sprocket wheels 42, 42, 43, 43, which are arranged below the female die 12 and constitute a part of the sheet feeding device 5, are described below. Are also connected to the female die 12. Therefore, the sheet feeding device 5 advances and retreats in the direction (Y direction) approaching and separating from the male mold 25 integrally with the female mold 12.

On the base frame 6, there is provided an unwinding machine RS loaded with a long strip-shaped picture sheet S wound up in a roll shape. The unwinding machine RS and a plurality of guide rollers 48, 48,.., So that one shot of the sheet S with the picture sent out as described later is supplied onto the parting surface 14 of the female die 12, the right end of the base frame 6 (the female die 12 side). ) And a pair of left and right sprocket wheels 41, 41, 44, 44, 45 near the left end.
45 are also provided (see also FIG. 4). The sprocket wheels 41, 41 located at the right end are driven to rotate by a stepping geared motor 52.
44, 45 (left row) and 41, 44, 45 (right row) and the left and right sprocket wheels 4 below the female die 12.
The endless annular chains 50, 50 of the same size and shape as the sheet conveying members are respectively wound around the reference numerals 2, 43 (left column) and 42, 43 (right column) so as to form an L-shape as a whole. Have been.

Here, as shown in FIGS. 6 and 7, the endless annular chains 50, 50 are provided with support members 61, for example, at every two pitches.
A large-diameter roller 62 and a small-diameter roller 63 are attached to a lower portion and an intermediate portion of the roller, and a predetermined pitch (for example, 5 pitches)
Each time, a sheet gripping chuck 60 for gripping both ends in the width direction of the one-shot painting sheet S is provided above the support member 61. The required number of the sheet gripping chucks 60 are provided only in a specific range of the endless annular chains 50, 50 so that the sheet S with a length of one shot can be gripped.
The part of the endless annular chains 50, 50 where the sheet gripping chuck 60 is provided (the part that grips the one-shot painting sheet S) is placed in the base frame 6 on the female die 12. A reciprocating motion is made between a standby position located and a supply position located on the female parting surface 14.

More specifically, at the standby position, the sheet S with the picture from the unwinder RS is moved from a sheet holding mechanism 55 provided on the base frame 6 to a pair of rails as shown in FIG. The sheet pulling mechanism 57 sliding on 59, 59 is pulled out by one shot in the Y direction, and both ends in the width direction of the drawn sheet S for one shot are provided on the endless annular chains 50, 50. The required number of left and right sheet gripping chucks 60, 6
.., And the one-shot picture sheet S in this gripped state is separated from the unwinder RS by the sheet cutter 56. Next, the gripped picture sheet S
Is transported to a supply position directly above the female parting surface 14 which is curved in a substantially convex shape. After the transportation, the painting sheet S is fixed and held on the female parting surface 14 by the clamper 20 as described later. After that, the sheet grip chucks 60 are returned to the standby position.

In order to adopt such a sheet supply mode, the left and right endless annular portions are provided on the parting surface 14 side of the female mold 12 as shown in FIGS. 2, 3 and 5 and the like. Chain 50, large diameter roller 62, small diameter roller 6
3 and a pair of left and right supply-side guide grooves 36, 36 extending in the vertical direction (Z direction) while being curved along the outer peripheral parting surface 14a for guiding the passage of the sheet gripping chucks 60, 60,. A pair of left and right bottom-side guide grooves 38, 38 extending in the vertical direction (Z direction) through which the left and right endless annular chains 50 and the large-diameter rollers 62 pass are provided on the bottom side of the female mold 12. Is provided.

Here, the supply side guide groove 36 is provided with the endless annular chain 50 and the sheet holding chucks 60 and 6.
.. Have a cross-sectional shape capable of regulating the position in two directions orthogonal to the sheet conveying direction, and have an intermediate wall 36A protruding in the groove width direction as shown in FIGS. The upper side of the intermediate wall 36A is an opening groove 36a that opens in the parting surface 14 where the lower portion (fixed receiving piece 65) of the sheet gripping chuck 60 is located. The large-diameter rollers 62 and the small-diameter rollers 63 provided on the endless annular chains 50, 50 are inserted and guided so as to sandwich them, and the intermediate wall 3
6A and the bottom wall are provided with position regulating concave portions 36d and 36c into which the large-diameter roller 62 is loosely fitted. Due to the presence of the position restricting recesses 36d, 36c and the intermediate wall 36A, the endless annular chains 50, 50 and the sheet gripping chucks 60, 60,... Two directions perpendicular to the direction along the surface 14 (vertical direction and horizontal direction in FIG. 7)
The position is regulated with respect to.

The sheet gripping chuck 60 is provided on the support member 61 in a lateral direction so as to protrude in a lateral direction and receives a back side (lower side) of the painting sheet S from the fixed receiving portion 65 and the parting surface 14. A movable holding piece 66 pivotally supported by a support plate 64 so as to be positioned on the upper side; and a movable holding piece 66, which is always fixed by a compression coil spring 67. 65, the sheet S is urged in a direction for holding the painting sheet S. Therefore, the painted sheet S gripped by the sheet gripping chucks 60 is moved substantially along the convexly curved parting surface 14 of the female die 12. In order to more firmly and securely hold the picture sheet S by the movable holding piece 66 and the fixed receiving piece 65, the contact holding portion (the picture sheet S) is appropriately used.
May be formed at the one end portion sandwiching the first and second teeth so as to be meshed with each other, or a countermeasure such as engraving fine embossed irregularities on them may be taken.

On the side of the endless annular chain 50 of the movable pressing piece 66, the clamper 20 is provided with a picture sheet S.
When the roller 6 is pressed and fixed to the female parting surface 14, the roller 6 pressed against the interference avoiding concave portion 21 provided on the
When the roller 68 is pressed by the concave portion 21 of the clamper 20, the movable pressing piece 66 separates from the fixed receiving piece 65 against the urging force of the compression coil spring 67. The sheet holding chuck 60 releases the holding state of the sheet S with the image (see FIG. 8).

On the other hand, in order to apply a required tension to the endless annular chains 50, 50, in the present embodiment, as shown in FIG. A pair of tension-applying sprocket wheels 46 are provided which are pressed against each other.
Position of the tension imparting sprocket wheel 46 with respect to the endless annular chain 50 (Y direction in FIG. 1).
Is adjusted, the tension of the endless annular chain 50 is adjusted, and the endless annular chain 50 and the sheet holding chuck 6 with respect to the supply side guide groove 36 of the female die 12 are adjusted.
The position of 0 is uniquely determined. Note that a sprocket wheel 47 (shown by a virtual line) for applying tension may be similarly provided above (upstream side) the female die 12.

In addition to the above configuration, in the simultaneous injection molding painting apparatus 10 of the present embodiment, since the parting surface 14 of the female mold 12 is a substantially convex curved surface,
Since a hot plate for heating and softening the painted sheet S pressed and fixed on the parting surface 14 by the clamper 20 cannot be properly performed with a conventional flat plate-shaped structure,
The hot platen 70 has a configuration as shown in FIGS.

That is, the hot platen 70 of the present embodiment, when the painting sheet is not heated, is at a standby position in the horizontal direction (X direction) from above the cavity 13 of the female die 12 (see FIG. 2).
The air cylinder 85 as a hot platen advance / retreat drive means is moved backward from the standby position to the opposed heating position on the cavity 13 of the female mold 12 (see FIGS. 9, 14 and 15) when the painted sheet is heated. A rectangular thin box-shaped holding case 75 fixed to the tip of the piston rod 86, and a hinge member 79 provided on a bracket 78 protruding near the center of a side wall 76 in the left-right direction (X direction) of the holding case 75 are provided. First plate-shaped heating unit 7 connected to be openable and closable via
The first and second plate-shaped heating sections 72 are provided.

On the other hand, the first plate-shaped heating section 71 and the second
Each of the plate-like heating portions 72 has one end of link members 73 and 74 rotatably connected near the center of the side end surface thereof,
The other ends of the link members 73 and 74 are connected to the holding case 7.
The piston rods 80a, 80 of the air cylinder 80 having two piston rods, which are fixed and housed in the piston 5, and whose piston rods 80a, 80b protrude from both ends.
b are rotatably connected to both ends through connecting members 81 and 82, respectively. Connecting members 81 and 82 for connecting the link members 73 and 74 and both end portions of the piston rod 80a are elongated holes 77 formed in the side wall 76 of the holding case 75 and extending in the vertical direction (Z direction). , 7
7 is slidably loosely inserted.

Here, the piston rods 80a and 80b of the air cylinder 80 are constantly urged in the projecting and extending direction by urging means such as a coil spring.
0 is at the standby position outside the female mold 12 (X direction) (see FIG. 2), the piston rods 80a, 80b
Are most protruded and extended, and at this time, the first plate-shaped heating unit 71 and the second plate-shaped heating unit 7
2, as shown by a virtual line in FIG. 14, is opened by 180 degrees like a single plate-like hot plate.
On the other hand, the opposite heating position on the painting sheet S in which the hot platen 70 is fixed and held on the parting surface 14 of the female mold 12 which is a curved surface having a substantially convex shape (see FIGS. 9 and 15).
To the columnar members 90 and 9 as described later.
After being fixed by the guide fixing holes 92, 92, the piston rods 80a, 80b are brought into the most retracted state. At this time, the first plate-shaped heating portion 71 and the second plate-shaped heating The free ends of the portions 72 are relatively rotated in opposite directions relative to each other with the hinge member 79 as a fulcrum, and as shown in FIG. They are adjusted in a generally "C" shape, and they take the proximity heating position. Therefore, in the present embodiment, the air cylinder 80 and the like are used as opening angle adjusting means.

As described above, the first plate-shaped heating portion 7 of the hot platen 70
The opening angle of the first and second plate-shaped heating sections 72 is adjusted to be substantially “C” shaped in side view so as to be along the picture sheet S, so that compared to a conventional flat plate-shaped hot plate, The separation distance between the heating surfaces 71a and 72a and (the outer peripheral portion of) the painting sheet S is greatly reduced (from La to Lb in FIG. 14).
At the same time), the heating temperature distribution of the painting sheet S can be made uniform (the distribution range is small) as compared with a conventional flat plate type heating plate. That is, when the hot platen is of a flat plate type, among the painted sheets, the vicinity of the top of the painted sheet S forming a convex curved surface is close to the heating surface of the hot platen, but the convex curved surface (Bottom side) is far away from the heating surface of the hot platen.
On the other hand, in the hot platen 70 of the present embodiment, the painting sheet S
The difference between the maximum separation distance and the minimum separation distance between the first heating plate 71 and the heating surfaces 71a, 72a of the second heating plate 72 becomes extremely small, and the stretching amount in each part of the sheet S with the drawing becomes small. It does not vary, and distortion of the pattern and displacement between the pattern and the molded body are less likely to occur.

Further, in the present embodiment, when the hot platen 70 is advanced from the standby position to the opposed heating position, the hot platen 70 is guided and fixed at a fixed position with respect to the female die 12. The following configuration is added.

That is, at the both ends (upper and lower ends) of the side wall 76 which is the front end side (the female mold 12 side) of the holding case 75 of the hot platen 70 as viewed in the hot plate advancing direction, the tapered guide portions 95a ( Guide rod 9 with FIGS. 2 and 15)
5 and 95 are vertically projected, while the guide rod 9
5, 95 at the upper and lower positions on the surface opposite to the standby position of the hot platen 70 across the female die 12 on the female die fixing surface side of the movable platen 11 so as to be located on the horizontal extension line of the movable platen 11. ,
The columnar members 90, 90 for fixing and guiding the hot plate are vertically provided in parallel with each other.

As shown in FIGS. 16A and 16B, when the hot platen 70 is advanced from the standby position to the opposed heating position near the upper ends of the columnar members 90, 90, as shown in FIGS. The conical guide surface portion 9 into which the tapered guide portions 95a of the guide rods 95 are slidably fitted and inserted.
A guide fixing hole 92 having 1 is formed in the horizontal direction. The inner diameter of the guide fixing hole 92 is
Is approximately the same as or slightly larger than the outer diameter of

In the simultaneous injection molding apparatus 10 of the present embodiment having the above-described configuration, the painting sheet S is a continuous long strip-shaped sheet wound up in a roll.
At the upper left of the female die 12 (upstream in the sheet conveyance direction)
, One shot is unwound from the unwinding machine RS, and a required number of sheet gripping chucks provided at the pair of endless annular chains 50, 50 and arranged at regular intervals along the sheet conveying direction. .., Both ends in the width direction of one shot are gripped by 60,..., And one shot is cut off from the unwinder RS side by the sheet cutter 56.

Here, the pair of endless annular chains 5
The left and right sprocket wheels 41 to 45, which are endless annular bodies, respectively, constitute guide driving means.
The endless annular chain 5 is disposed so as to pass through the supply-side guide groove 36 and the bottom-side guide groove 38 provided in the female mold 12 at all times.
Sheet grip chucks 60 provided at 0 and 50,
The parts 60,... Are placed in a standby position outside the female mold (FIG. 1).

Therefore, the sheet gripping chuck 6
When the stepping geared motor 52 is rotated by a predetermined number of revolutions in one direction (forward direction) in a state where both ends in the width direction of the painting sheet S are gripped by 0, 60,. 41-45
Are rotated in one direction (clockwise in FIG. 1), and the endless annular chains 50, 50 rotate accordingly, and the sheet gripping portions (fixed receiving portion 65) of the sheet gripping chucks 60, 60,. The movable pressing piece 66) is used to insert the large-diameter roller 62 and the small-diameter roller 63 into the supply-side guide groove 36 provided along the parting surface 14 (14a) of the female die 12. As shown in FIGS. 2 and 9, the sheet holding chuck 6 of the endless annular chains 50, 50 moves on the parting surface 14 in conjunction with it.
0, 60,..., The painted sheet (1
The shot S) is conveyed and positioned just above the convexly curved parting surface 14 of the female die 12 (the sheet gripping chucks 60, 60,... Are moved from the standby position to the supply position). Move).

Subsequently, the sheet S with the picture is attached to the clamper 20.
When the picture sheet S is fixed and held on the outer parting surface 14a of the female mold 12 by the clamper 20, the sheet S is fixed and held on the outer parting surface 14a of the female mold 12 by the The sheet holding chucks 60, 60,
.. Perform a release operation for releasing the gripping state of the painting sheet S. That is, as can be clearly understood with reference to FIGS. 7 and 8, the roller 68 provided on the movable pressing piece 66 of the sheet gripping chucks 60, 60,. The movable holding piece 66 separates from the fixed receiving piece 65 against the urging force of the compression coil spring 67, and the sheet holding chuck 60 releases the holding state of the sheet S with the image.

Further, the sheet holding chuck 60,
After the release operation is performed at 60,..., The painting sheet S is moved by the clamper 20 to the parting surface 14a.
In a state where the stepping geared motor 52 is fixedly held on the upper side, the stepping geared motor 52 is rotated in the reverse direction, and the left and right sprocket wheels 41 to 45 are rotated in the opposite direction (counterclockwise in FIG. As a result, the endless annular chains 50, 50 rotate in the opposite direction, and the sheet gripping portions ((fixed receiving piece 65, movable pressing piece, etc.) of the sheet gripping chucks 60, 60,. The portion 66) is pulled out from the supply side guide groove 36 provided along the parting surface 14 (14a) of the female die 12 to the upstream side of the female die 12 in such a manner that the large-diameter roller 62 and the small-diameter roller 63 are drawn. In response to this, it is returned to the original standby position, and preparations (sheet pull-out, gripping, etc.) for supplying the next shot-added sheet S are performed.

Next, the sheet gripping chucks 60, 6
The hot platen 70 is moved from the standby position (FIG. 2) while the outer peripheral portion of the painted sheet S released from 0,... Is fixedly held on the parting surface 14a of the female die 12 by the clamper 20. It is advanced to the directly above opposing heating position.

Here, the first plate-shaped heating section 71 and the second plate-shaped heating section 72 of the hot platen 70 are still one sheet as shown by the phantom lines in FIGS. When the hot plate 70 is advanced from the standby position to the opposed heating position, the guide rods 95 provided on the hot plate 70 are opened by 180 degrees like the flat plate of FIG. , 95 (the tapered guide portion 95a) are shown in FIG.
As shown in (A) and (B), the conical guide surface 91 pierced in the columnar members 90, 90 installed on the opposite side of the hot platen 70 from the standby position with the female die 12 interposed therebetween. It is inserted while being slidably contacted with the guide fixing hole 92 and stopped there.

The guide rod 9 with respect to the guide fixing hole 92
The hot plate 70 with the guide rods 95, 95 can move in the insertion / removal direction of the guide rods 95, 95, that is, can move in the forward / backward directions by the fitting of the guide rods 5, 95,
The behavior in other directions is substantially restricted,
The whole 0 is in a stationary (fixed) state at the opposed heating position.

After the hot platen 70 is fixedly held on the columnar members 90, 90 via the guide rods 95, 95 in this way, the air cylinder 80 of the hot platen 70 is actuated, as shown in FIG. As shown in FIGS. 14 and 15, the opening angle of the first plate-shaped heating unit 71 and the second plate-shaped heating unit 72 is set so as to be along the convexly curved parting surface 14a (that is, the Section such that the painted sheet S fixed to the printing surface 14a and the heating surface of the hot platen 70 are closer to parallel, and the distribution of the distance between the painted sheet and the hot platen is minimized over the entire painted sheet). They are automatically adjusted in a "-" shape so that they take an approaching heating position, and the painting sheet S is heated and softened by the heating surfaces 71a and 72a (heating softening step). As shown in 11 To be brought into close contact with them is caused to stretch along the inner circumferential side parting surface 14b and the cavity 13 of the female mold 12 by vacuum suction through the vacuum suction holes 17 and slit-shaped gap 15 (the stretching step).

After the completion of the heating and softening step, the first plate-shaped heating section 71 and the second plate-shaped heating section 72 are opened by 180 degrees from the state where the "C" -shaped approaching heating position is taken. In addition to being returned to the original state, the piston rod 86 of the air cylinder 85 constituting the hot platen advance / retreat means is retracted, and the guide rods 95 and 95 are inserted into the guide fixing holes 9.
2, and the entire hot platen 70 is returned from the opposed heating position to the standby position.

As described above, the hot platen 70 is guided and fixed to the columnar members 90, 90 at the opposed heating positions via the guide rods 95, 95, so that the hot platen 70 is orthogonal to the advancing / retreating direction. Undesirable vibration in two directions (up and down or front and back) is less likely to occur. Therefore, the painting sheet S, the first plate-shaped heating unit 71 and the second plate-shaped heating unit 7
2, the distance between the heating surfaces 71a and 72a becomes constant,
An accident in which the heating plate 70 (the first plate-shaped heating portion 71 or the second plate-shaped heating portion 72, etc.) comes into contact with the female mold 12, the clamper 20, or the like is less likely to occur.

Further, the first plate-shaped heating portion 71 and the second plate-shaped heating portion 72 of the heating plate 70 are moved forward onto the female mold cavity 13, in other words, from the standby position to the opposed heating position. Until the guide plate is fixed by, as shown by a phantom line in FIGS. 2 and 14, it is formed in a single plate shape opened by 180 degrees in the thickness direction (Y direction) of the entire heating plate 70.
Occupied space is reduced, and on the female mold cavity 13, the close heating position is adjusted by adjusting the cross-section into a “く” shape along the convexly curved parting surface 14 a. When the hot platen 70 advances and retreats, the first plate-shaped heating unit 71 formed as a single plate with the female mold 12 and the clamper 20 is used.
Since a large space is formed between the heating plate 70 and the second plate-shaped heating portion 72, in particular, on the outer peripheral side, the first plate-shaped heating portion 71 and the second plate-shaped heating portion 72 etc.) is less likely to contact or interfere with the female mold 12 or the clamper 20.

Further, the passage space (passage cross-sectional area) required for the movement of the hot platen 70 between the standby position and the opposed heating position can be reduced to a minimum necessary size. Interference with various devices, wiring, piping, etc. arranged around the female mold 12 is effectively avoided, and the degree of freedom in layout of such devices, wiring, piping, etc. is increased, and space is increased. Efficiency and work efficiency are improved.

After the heating softening step and the stretching step, a mold clamping step of moving the female mold 12 to the male mold 25 side to perform mold clamping (see FIG. 12) is performed as in the conventional case. At this time, the entire sheet feeding device 5 is
And moves to the male mold 25 side integrally. Subsequently, the male mold 2 is placed in the cavity 13 formed between the female mold 12 and the male mold 25.
5, an injection molding step (see FIG. 13) for injecting and filling a resin (molten resin or the like) in a flowing state through a runner 27 and gates 28 and 28 to solidify the resin; A mold opening step of separating, a sheet trimming step of separating a portion of the painted sheet S to be bonded and attached to the injection resin molded body from other portions (excess portion), and Through the removal step of taking out from the molding die, a laminated product (product) in which the painted sheet is laminated on the injection resin molded body is obtained.

[0063]

As will be understood from the above description, in the simultaneous injection-molding and painting apparatus according to the present invention, the first plate-shaped heating section and the second plate-shaped heating section in the hot platen are advanced and retracted. Occasionally, as a single-plate shape opened 180 degrees, the occupied space in the thickness direction of the entire hot platen is reduced, and the cross section along the convexly curved parting surface is formed on the female mold cavity. When the hot plate moves forward and backward, the female plate, the clamper, etc., and the single plate-shaped first plate-shaped heating unit and the second plate-shaped heating unit, particularly, on the outer periphery side Therefore, an accident such that the hot platen (the first plate-shaped heating portion, the second plate-shaped heating portion, and the like) contacts and interferes with the female mold, the clamper, and the like is less likely to occur. In addition, the passage space (passage cross-sectional area) required for the hot platen to move between the standby position and the opposed heating position can be reduced to the minimum necessary size. Interference with various equipment, wiring, piping, etc.
The degree of freedom in layout and design of such devices, wiring, piping, etc. is increased, and space efficiency and work efficiency are improved. Furthermore, since it is not necessary to increase the separation distance between the plate-shaped heating part of the hot platen and the female mold, etc., it is possible to reduce the heat energy of the hot platen and the heat softening time, and to suppress the increase in the molding cost and the molding cycle. it can.

[Brief description of the drawings]

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

FIG. 2 is a perspective view showing a female peripheral portion of the device shown in FIG. 1;

FIG. 3 is a front view of a peripheral portion of a female mold of the device shown in FIG. 1;

FIG. 4 is an enlarged view of FIG.

FIG. 5 is a horizontal sectional view of the female mold shown in FIG. 1;

FIG. 6 is a partially enlarged side view showing an endless annular chain and a sheet gripping chuck used in the apparatus shown in FIG. 1;

FIG. 7 is a partially enlarged cross-sectional view for describing an endless annular chain, a sheet gripping chuck, and a guide groove provided in a female die used in the apparatus shown in FIG. 1;

FIG. 8 is a partially enlarged cross-sectional view used for describing the operation of the endless annular chain and the sheet gripping chuck used in the apparatus shown in FIG.

FIG. 9 is a perspective view of a peripheral portion of a female die used for explaining a sheet feeding step of the apparatus shown in FIG. 1;

FIG. 10 is a diagram which is used for describing a sheet supply step of the apparatus shown in FIG.

FIG. 11 is a diagram which is used for describing a stretching step and a heat softening step of the apparatus shown in FIG. 1.

FIG. 12 is a diagram which is used for describing a mold clamping step of the apparatus shown in FIG.

FIG. 13 is a diagram which is used for describing an injection molding process of the apparatus shown in FIG.

FIG. 14 is a diagram provided for describing a hot plate used in the apparatus shown in FIG. 1;

FIG. 15 is a perspective view for explaining a hot plate and a hot plate guide fixing means used in the apparatus shown in FIG. 1;

FIG. 16 is a perspective view for explaining the operation of a hot plate and a hot plate guide fixing means used in the apparatus shown in FIG. 1;

[Explanation of symbols]

 S Painting sheet 5 Sheet feeding device 10 Injection molding simultaneous painting device 12 Female mold 13 Cavity 14 Parting surface 15 Slit-shaped gap 17 Vacuum suction hole 20 Clamper 25 Male mold 50 Endless annular chain 60 Sheet gripping chuck 70 Hot plate 71 1 plate-shaped heating section 72 second plate-shaped heating section 80 air cylinder for opening angle adjustment 85 air cylinder for hot plate advance / retreat 90 columnar member 92 guide fixing hole 95 guide rod

Claims (1)

[Claims] A female mold and a male mold which are arranged to face each other so that one of them can be moved to the other side; and wherein the female mold and the male mold are movable in a direction orthogonal to a parting surface of the female mold. Clamping means for pressing and fixing the painted sheet on the female parting surface, a hot plate for heating and softening the painted sheet, and when the heated plate is not heated,
A hot platen reciprocating drive means for retracting to the standby position outside the female mold and for advancing from the standby position to the opposing heating position on the female mold cavity when the painted sheet is heated; and the male mold in the female mold cavity. A resin injection means for injecting and filling a resin in a fluid state from the side, and an injection molding simultaneous painting apparatus, comprising: the female parting surface is a substantially convex curved surface;
A first plate-shaped heating unit, a second plate-shaped heating unit, and a first plate-shaped heating unit that are rotatably connected to each other so that the heating plate can have a required opening angle; When the hot platen is moved forward and backward between the standby position and the opposed heating position, the opening angle between the platen and the second plate-shaped heating unit is set to 180 degrees, and when the hot platen is at the opposed heating position, Opening angle adjusting means for reducing the opening angle so that the first plate-shaped heating unit and the second plate-shaped heating unit are along the female parting surface. Injection molding simultaneous painting equipment.