JP2002103387A - Apparatus for in-mold decorating synchronized with injection molding and laminated product - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an apparatus for in-mold decorating synchronized with injection molding which is so designed as to prevent wrinkles or the like of an in-mold decorating sheet at a corner part or on a weldline of a laminated product to be obtained. SOLUTION: The apparatus is equipped with a female mold 12 and a male mold 30, a clamper 20 pressing and fixing the in-mold decorating sheet S on a parting face 14 of the female mold 12, a vacuum suction means for stretching the pressed and fixed sheet S along a cavity 13 of the female mold 12 and a resin injection means for injecting and filling resin Pr into the cavity through a runner 34 and gates 35-37 provided in the male mold 30. On the occasion of obtaining the laminated product by laminating integrally the injected and filled resin Pr and the sheet S, the number of the runner 34 and the gates 35-37 and positions, shapes and effective cross-sectional areas of passages thereof and the temperature, flow velocity, etc., of the resin in a flowing state are set so that the weldline to be formed by joining of the flowing resin be formed at a portion off the corner part of the laminated product.

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 (laminated product) in which a pictorial sheet on which patterns and characters are applied in a mold at the same time as injection molding is integrally laminated on the surface of an injection resin molded product. ) Relates to a simultaneous painting apparatus for injection molding.

[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 pressing and fixing the painted sheet to 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). (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.

[0005] Simultaneously performing a plurality of steps simultaneously 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.

[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, a simultaneous painting apparatus for injection molding, for example, as shown in FIG.
(B) shows an injection having two rectangular window holes 1A and 1B with rounded corners separated by a partition-shaped reinforcing partition wall 1G as shown in the cross section taken along the line BB in (A). When obtaining a frame-shaped laminated product 1 in a trapezoidal shape in plan view formed by bonding and laminating a painting sheet S on the surface of a resin molded body P, it is usually necessary to provide a plurality of gates (multipoint gates) in a male mold. (In FIG. 3, FIG. 7, etc.
36 and 37 indicate gates). When a plurality of gates are provided in this manner, a plurality of flows corresponding to the number of the gates are generated in the resin (molten resin) in a flowing state injected into the cavity through the gates, and the plurality of gates are generated. The weld line is located at the part where the flows merge (Fig. 8 (A)
(Shown by the symbol WL).

[0008] In the laminated product 1 obtained by the simultaneous painting apparatus for injection molding, the weld line WL formed on the injection molded resin article P is not so noticeable, but is adhered and laminated on the weld line WL of the painted sheet. Wrinkles and the like are likely to be generated in the part where the laminated product 1 is formed.
e, 1f, 1g, and 1h (weld lines formed at the corners 1c and 1d in FIG. 8A are denoted by reference characters WL '), the corners 1c, There was a high possibility that wrinkles and the like would occur in the portion to be bonded and laminated on 1d. This is because the painted sheet S is pulled by the viscous resistance of the molten resin and collides with each other in the weld line portion in the opposite directions.

In addition, in the simultaneous painting by injection molding, usually, the corners 1a, 1b, 1
Since the portion to be bonded and laminated to c and 1d has a larger drawing amount (stretching amount) in the stretching step, the portion is heated to a higher temperature than the other portions in the heating and softening step to be softened more. In this way, it is heated and softened at a higher temperature than the other parts, and the stretch amount is large, the thickness is relatively thin compared to the other parts, and the residual stress and the residual strain are increased in the painted sheet. It is considered that wrinkles and the like easily occur when the molten resin joins at the corners. However, as long as the molten resin is injected into a finite volume cavity, it is impossible to eliminate the weld line itself.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to prevent a wrinkle or the like from occurring in a painted sheet at a corner or a weld line of a laminated product to be obtained. The object of the present invention is to provide a simultaneous painting apparatus for injection molding.

[0011]

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, sheet supply means for supplying a painted sheet onto the female parting surface, and a movable member in a direction orthogonal to the female parting surface, A clamper pressed and fixed to the female parting surface, a vacuum suction means for extending the painted sheet pressed and fixed by the clamper along the cavity of the female mold, and between the female mold and the male mold. Resin injection means for injecting and filling a resin in a flowing state through a runner and a gate provided in the male mold into the formed cavity, wherein the resin injected into the cavity and the picture The sheet is integrally laminated is to obtain a laminated product.

Then, the runner and the gate of the runner and the gate are formed so that a weld line formed by joining two or more flows of the resin in the flowing state is formed at a position deviated from a corner of the laminated product. It is characterized in that the number, position, shape, effective passage cross-sectional area, temperature of the resin in the flowing state, flow velocity and the like are set.

As described above, the number and position of runners and gates provided in the male mold, the position, the effective passage cross-sectional area, the temperature of the resin in the flowing state, the flow velocity, and the like are appropriately set and adjusted, and the weld line is formed at the corner of the laminated product By forming it at a portion outside the part, wrinkles and the like hardly occur at the corners of the obtained laminated product. The site where the weld line is formed can be predicted fairly accurately by experiments, computer simulations, and the like.

In a preferred embodiment of the simultaneous painting apparatus for injection molding according to the present invention, a heating plate for heating and softening the painting sheet pressed and fixed by the clamper is provided, and the heating temperature of the painting sheet by the heating plate is: The portion to be bonded and laminated at the portion where the weld line is formed is made lower than the portion to be bonded and laminated at the corner portion. In this case, in a more specific preferred embodiment, a shielding plate is provided on a portion of the heating surface of the hot plate facing a portion of the painting sheet that is bonded and laminated to a portion where the weld line is formed. Is done.

[0015] As described above, of the painted sheets,
The heating temperature of the portion that is adhesively laminated on the portion where the weld line is formed is made lower than the portion that is adhesively laminated on the corner portion, so that the painted sheet becomes relatively harder than other portions, It becomes difficult to be attracted by the molten resin, and it becomes difficult to generate wrinkles on the weld line.

The heating plate is preferably composed of a plurality of surface heating elements, and the surface heating element heats a ceramic plate or a metal plate with a heating wire such as a nichrome wire provided therein. , Induction heating or dielectric heating by an electromagnetic field, heating by flowing a heat medium such as high-temperature steam into an embedded tube, heating by an embedded heat pump, and the like. The painted sheet is heated and softened by the radiation of heat rays. Alternatively, the surface heating element may be formed of a sheet-like resistor, and may be energized and heated to radiate heat rays.

Further, a surface heating element having a uniform distribution of the heating temperature (radiation amount of heat rays) on the entire heat radiation surface is used, and by installing the shielding plate, the effective heating temperature for the painted sheet is controlled. You may do so. The shape of the hot plate is a flat plate,
No. 94917, Japanese Unexamined Patent Publication No. 11-275730, etc., a female mold or a dedicated mold having the same shape as the female mold (cavity) for performing the heating softening and stretching steps of the painted sheet. For example, it may be a three-dimensional type corresponding to the parting surface, cavity shape, or the like, for example, in a “C” shape in side view.

As the shielding plate, a metal plate having good heat ray reflectivity and heat resistance is used. The material is preferably a metal such as aluminum, silver, copper, and gold. Alternatively, iron-based metals such as carbon steel and stainless steel, and titanium alloys can also be used. Since gold, silver, and the like are expensive, a thin film of gold, silver, or the like may be formed on the surface of an iron-based metal or the like by plating, vacuum evaporation, or the like. The thickness of this shielding plate is preferably about 0.3 to 2.0 mm.

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 and the like) for vacuum suction and supply of compressed air as required. Further, the female mold is constituted by an aggregate of a plurality of divided portions (in a so-called nested structure), a slit-like gap is formed between adjacent divided portions, and vacuum suction is performed using this gap as a vacuum suction hole. It may be.

The male mold is provided with a runner for injecting a resin in a flowing state and a required book gate. The number of gates, the position, the shape, the effective passage cross-sectional area, the temperature of the resin in a fluidized state, the flow velocity, etc. are taken into consideration in consideration of the shape of the product to be obtained. It is set appropriately so as to be formed at a position outside the part.

In addition, a clamp means is provided for fixing and holding the painting sheet on the female parting surface. As the clamping means, a frame-shaped or cross-girder-shaped one can be used. To move the clamp means forward and backward with respect to the female parting surface, use a molding driving force such as a mold clamping operation,
In addition to using the power of the ejector pin driving mechanism, the driving is performed by separately providing a driving means such as a fluid pressure actuator.

As a method of supplying a sheet with a picture, an unwinding winding method (roll / roll method) or a female continuous sheet is provided by gripping a leading end of a long continuous belt-like sheet wound in a roll shape with a transport chuck or the like. In addition, any of a supply method such as a method in which a sheet is cut by every shot to form a single sheet and a method in which a single sheet is supplied by a robot or the like can be adopted.

The apparatus of the present invention preferably includes 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. Also,
A cutting means for cutting the painted sheet in the width direction may be provided on the hot platen. As the cutting means, a heating wire made of a heating wire such as a cutting blade or a nichrome wire can be used.

The painted sheet is composed of a base sheet and a decorative layer laminated thereon, and is used as a final laminated sheet (laminated sheet) which is used as a final product while the base sheet is in close contact with and integrated with the injection molded resin article. And, it is possible to use both the transfer sheet that peels off and removes the support sheet of the painted sheet integrated with the surface of the injection resin molded body and leaves only the transfer layer such as the decorative layer on the injection resin molded body side. it can.

In the case of the laminated sheet, the base sheet is made of a polyolefin resin such as polyethylene or polypropylene, or a thermoplastic resin such as polyvinyl chloride, acrylic resin, polystyrene, ABS resin, polycarbonate resin or polyester resin. The sheet is a single layer,
Alternatively, two or more different types of sheets can be laminated and used. 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, such as a picture layer, once formed on a releasable support sheet, to another transfer target. 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
For example, a flexible thermoplastic resin film having a thickness of about 20 to 100 μm, such as a polyamide resin such as No. 6, a polyolefin resin such as polyethylene or polypropylene, a polyester resin, or polyvinyl chloride, or a laminate thereof is preferable.

As a resin for injection molding, a thermoplastic resin such as ABS (acrylonitrile-butadiene-styrene copolymer) resin, polystyrene, polyvinyl chloride, acrylic resin, polycarbonate resin, etc. is heated and melted to be in a liquid or fluid state. Or two-part curing type, catalyst curing type resin, for example, uncured liquid such as urethane resin, polyester resin, etc. It is selected according to physical properties and cost.

[0029]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is an overall schematic longitudinal sectional view showing an embodiment of an injection molding simultaneous painting apparatus according to the present invention.

As shown in FIG. 8, the laminated product 1 to be obtained by the simultaneous painting apparatus 10 for injection molding of this embodiment is a rectangular window hole 1A with rounded corners separated by a partition-shaped reinforcing partition wall 1G. 1B is a frame-shaped laminated product having a trapezoidal shape in plan view formed by bonding and laminating a painting sheet S on the surface of an injection resin molded body P having 1B. Here, a transparent substrate sheet (having a thickness of 125 μm) made of a polymethyl methacrylate-based acrylic resin and a decorative layer (acrylic resin and vinyl chloride-vinyl acetate copolymer) laminated thereon by a gravure printing method are used as the painted sheet S. A 1: 1 weight ratio mixture of the coalesced is used as a binder resin, and a pigment composed of titanium white, red iron oxide, graphite, phthalocyanine blue, and carbon black is added thereto.
And an adhesive layer (a transparent material made of a vinyl chloride-vinyl acetate copolymer system). The laminated sheet (laminate) is used as a final product while the base sheet is tightly integrated with the injection molded resin P. Sheet). The decorative layer (pattern layer) has a grain pattern obtained by combining three colors of a pattern plate, and the adhesive layer has a gravure solid printing plate (screen depth 60) having a screen ruling of 40 lines / cm.
μm) twice (by two-color gravure printing) to form a layer having a thickness of 2 μm.

As shown in FIG. 2, vertical positioning marks Ma, Ma,... Are formed at predetermined intervals in the sheet supply direction (Z direction) on the picture-added sheet S. A horizontal positioning mark Mb formed of a straight line is formed. The vertical positioning marks Ma, Ma,... Are read by a photoelectric tube sensor 56 disposed on the upstream side of the female die 12 described later, and the horizontal positioning marks Mb are disposed on the upstream and downstream sides of the female die 12. It is configured to be read by the photoelectric tube sensors 57, 58, and to adjust and position the feeding amount of the picture-sheet S based on the detection signals from the sensors 56, 57, 58.

Injection molding simultaneous painting apparatus 10 of this embodiment
Is provided with a female mold 12 and a male mold 30 having an uneven shape corresponding to the above-mentioned laminated product to be obtained. Although not shown, the female mold 12 has a bottom fixed to a movable platen, 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 / separating from the male mold 30.

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.

Above the female die 12 (upstream in the sheet supply direction), an upstream feeding device 101 is disposed to supply a painting sheet (laminated sheet) S on the parting surface 14 of the female die 12. A downstream sheet fixing device 102 is disposed near the lower portion of the female die 12 (downstream in the sheet supply direction).

The upstream feeding device 101 includes an unwinding machine 103 loaded with a long strip-shaped picture sheet (sheet roll), a sheet feeding roll 104 including a pair of nip rolls, and a guide roll 105. In addition to the above, in addition to the above, an open / close sandwiching type transport chuck 50 that grips a portion of the pictorial sheet S unwound from the unwinder 103 slightly upstream from the downstream end Se and transports it to the downstream sheet fixing device 102. have. The transport chuck 50 is attached to the tip of a piston rod 52 of an air cylinder (not shown), and moves from an initial position (the position of the transport chuck 50) shown in FIG. 1 in the Z direction (vertical direction = sheet feeding direction). Forward and backward straight along. Further, the unwinding machine 103, the sheet feeding roll 1
04, the guide roll 105, and the transport chuck 50 synchronize with each other in a state in which the painted sheet S is sandwiched, and the Y perpendicular to the width direction of the painted sheet S, that is, the X direction and the Z direction.
It can be moved laterally in the direction (FIG. 2). Also,
Although not shown, the unwinding machine 103 includes a paper tube support for supporting a paper tube of a wound picture sheet, a power source of an electric motor that rotationally drives the paper tube support, a braking device for the power source, and There are ancillary devices such as jigs for attaching these to a female mold.

The downstream sheet fixing device 102 receives the downstream end Se of the picture sheet S conveyed by the conveyance chuck 50 and holds and fixes the downstream end Se. And a support drive mechanism 65 for moving the chuck 60 in the width direction and the sheet supply direction of the painting sheet S, so that the (downstream end Se) of the painting sheet S can be moved in the width direction and the sheet supply direction. It has become.

In the female mold 12, a cavity 13 having protrusions 13A and 13B corresponding to the shape of the laminated product 1 to be obtained is formed. In the cavity 13, the painted sheet S is made to follow the cavity 13. Vacuum suction holes 15, 15, for vacuum suction to stretch
Are opened, and the vacuum suction holes 15, 15,.
Is connected to a vacuum source (not shown) including an external vacuum pump and the like via a vacuum suction passage 18 and a conduit 19.

Further, the parting surface 1 of the female mold 12
On the outer peripheral side of 4, an annular mounting groove 23 in which an O-ring 22 is mounted is provided. The O-ring 22 hermetically seals the cavity 12 and the outside when a rectangular frame-shaped or cross-girder-shaped clamper 20, which will be described later, is pressed against the parting surface 14 of the female die 12 with the painting sheet S interposed therebetween. Acts as a barrier to

On the other hand, although not shown, the male mold 30 is fixed to a fixed platen to which a nozzle of an injection molding machine is mounted, and the male mold 30 corresponds to the shape of the laminated product 1. Two large and small convex core portions 31 and 32 are provided vertically, and a concave portion 33 corresponding to the reinforcing partition wall portion 1g of the laminated product 1 is formed between the convex core portions 31 and 32. Is formed with a forked runner (hot runner) 34 for injecting a resin (molten resin) in a fluid state, and connected to the forked runner (hot runner) 34, the upper convex core portion 31 having two openings at upper and lower side surfaces thereof. (Submarine gates) 35 and 36, and one gate (submarine gate) 37 that opens to the lower surface of the lower convex core portion 32.

Here, in the present embodiment, as shown in FIG. 7, three flows of the resin in a flowing state which are injected into the cavity 13 from the three gates 35, 36, 37 are merged. Are formed at the eight corner portions 1a to 1g of the laminated product 1.
So that the runner 3
The position, shape, effective passage cross-sectional area, temperature of the resin in the flowing state, flow velocity, and the like are set.

In order to press and fix the supplied one-shot sheet S on the parting surface 14, the female mold 12 has a rectangular shape as shown by a two-dot chain line in FIG. A frame-shaped or double-girder-shaped clamper 20 is provided. The clamper 20 can be moved back and forth in a direction perpendicular to the parting surface 14 (X direction in the figure) by driving means (not shown) via four sliding rods 24 connected to four corners thereof. Has become.

Further, in order to perform preforming, FIGS.
Is provided with a hot platen 80 as shown in FIG. The hot platen 80 is moved by a hot platen transfer means 85 such as an air cylinder from a standby position outside the male and female molds to a painted sheet heating position on the parting surface 14 of the female mold 12, and the painted sheet S is moved.
Is heated and softened. The hot platen 80 includes four surface heating elements 81, 82, 83, and 84,
As the surface heating element, a non-contact heating type using infrared radiation for heating a ceramic plate or a metal plate with a heating wire such as a nichrome wire provided therein is used.

Here, the heating temperature of the upper and lower surface heating elements 81 and 84 for heating the portions of the painted sheet S which are bonded and laminated to the upper and lower corners 1a, 1b, 1c and 1d of the laminated product is intermediate. Are set higher than the heating temperatures of the surface heating elements 82 and 83. Also, as shown in FIGS. 5 and 6, the heating surface (front surface) of the surface heating element 84 faces a portion of the painting sheet S that is bonded and laminated to a portion where the weld line WL is formed. In order to lower the heating temperature, a shielding plate 90 made of a gold-plated copper plate, which has heat ray reflection and heat resistance, is provided at a predetermined position from the surface heating element (heating surface) 84 by a pin or the like. Are arranged at intervals.

A sheet cutter 8 for cutting the sheet S with a width in the width direction is provided above the clamper 20.
5 are provided. In the vicinity of the upper end of the female mold 12, receiving grooves 8 for receiving the sheet cutter 85 are provided.
6 are drilled. In the simultaneous injection molding painting apparatus 10 of the present embodiment having the above-described configuration, simultaneous injection molding painting is performed as follows.

First, the transport chuck 50 gripping the leading end Se of the painted sheet S is lowered, and
Apply the shot to female parting surface 14 and clamper 2
0, a sheet supply step of supplying the sheet S with the sheet S is performed on the parting surface 14 of the female mold 12 by the clamper 20, as shown in FIG. A fixing step for fixing is performed, and then the sheet S with the image is cut by the sheet cutter 85 near the upstream end of the female die 12 by radiant heat.

Subsequently, as shown in FIG.
Is moved onto the painted sheet S pressed and fixed by the clamper 20, and the female parting surface 14 is moved.
To soften the painted sheet S at the sheet heating position (the illustrated position), and
Vacuum suction is performed by a vacuum suction means including a vacuum suction hole 15 and the like, and the picture sheet S is stretched so as to be in close contact with the female mold cavity.

At this time, the surface heating elements 81 to 81 of the hot platen 80
The portion of the painted sheet S bonded and laminated to the upper and lower corners 1a, 1b, 1c, and 1d of the laminated product by 84 is heated and softened at a higher temperature than the other portions to increase the stretching amount, The portion where the shielding leaf spring 90 is provided, that is, the portion that is adhesively laminated on the portion of the painting sheet S where the weld line WL is formed is heated and softened at a lower temperature than other portions. The amount of stretching is reduced.

Thereafter, the hot platen 80 is retracted upward without interfering with the female mold 12 and the male mold 30, and the female mold 12 is moved toward the male mold 30 as shown in FIG. Type 12
As shown in FIG. 7, the resin Pr in a fluidized state from the injection molding machine is passed through the runner 34 of the male mold 30 and the three gates 35, 36, 37 to form a female mold. The cavity 13 formed between the mold 12 and the male mold 30 is injected and filled. In this case, the resin Pr in the flowing state injected from each of the gates 35, 36 and 37 forms three flows as shown by arrows in FIG. Weld line WL
In the present embodiment, as described above, the position, shape, effective passage cross-sectional area, temperature, flow rate, and the like of the runner 34 and the gates 35, 36, and 37 are set as described above. Therefore, it is formed at a position outside the corners 1a to 1g.

After the resin has solidified, the male and female molds 12, 30 are opened. Thereby, the laminated product 1 in which the painting sheet S is adhesively laminated on the surface of the injection resin molded body P is thereafter moved from the female mold 12 in the mold opening direction with the male mold 30 or by a take-out robot or an ejector pin. Taken out. After being taken out, a finishing process such as trimming unnecessary portions such as portions covering the window holes 1A and 1B of the painted sheet S is performed.

As described above, in the simultaneous injection molding painting apparatus 10 of the present embodiment, the number, position, effective passage cross-sectional area, run-off resin temperature, flow velocity, etc. of the runners and gates provided on the male mold 30 are as follows. Since the weld line WL is set so as to be formed at a position deviating from the corners 1a to 1g of the laminated product 1, wrinkles and the like hardly occur at the corners of the obtained laminated product 1.

Further, a shielding plate 90 is provided on the hot platen 80,
By lowering the heating temperature of the portion of the painted sheet S that is bonded and laminated to the portion where the weld line W is formed, than the portion that is bonded and laminated to the corners 1a, 1b, 1c, and 1d, Wrinkles and the like hardly occur on the weld line.

[0052]

As will be understood from the above description, according to the present invention, simultaneous molding by injection molding is performed so that wrinkles and the like are not generated in the painted sheet at the corners and weld lines of the laminated product to be obtained. Equipment can be provided.

[Brief description of the drawings]

FIG. 1 is a diagram for explaining an overall configuration of an embodiment of an injection molding simultaneous painting apparatus according to the present invention and a sheet supply step.

FIG. 2 is a plan view of a peripheral portion of a female die used for explaining a sheet feeding step of the apparatus shown in FIG. 1;

FIG. 3 is a schematic longitudinal sectional view used for explaining a clamping step, a heating softening step, and a stretching step of the apparatus shown in FIG.

FIG. 4 is a schematic longitudinal sectional view for explaining an injection molding process of the apparatus shown in FIG. 1;

FIG. 5 is a front view of a hot plate provided in the apparatus shown in FIG. 1;

FIG. 6 is a diagram which is used for describing a mounting position of a shielding plate provided on a hot platen.

FIG. 7 is a diagram for explaining a flow of a resin in a flowing state ejected from each male gate and a weld line.

FIGS. 8A and 8B show a laminated product obtained from the apparatus shown in FIG. 1, wherein FIG. 8A is a view as viewed from the back side, and FIG.
B arrow sectional drawing.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Laminated product P Injection resin molded object S Painting sheet 10 Injection molding simultaneous painting apparatus 12 Female mold 13 Cavity 14 Parting surface 15 Vacuum suction hole 20 Clamper 30 Male mold 31, 32 Convex core part 34 Runner 35, 36, 37 Gate WL weld line

 ────────────────────────────────────────────────── ─── Continued on the front page F term (reference) 4F202 AB11 AB12 AD05 AD09 AG03 AM36 AR06 CA11 CB01 CB19 CK06 CK86 CN01 CN21 CQ06 4F206 AB11 AB12 AD05 AD09 AG03 AM36 AR067 JA07 JB19 JF05 JF35 JL02 JM02 JM04 JN14 JN81 J32

Claims (4)

[Claims] A female die and a male die which are arranged to face each other so that one of them can be moved to the other side; sheet feeding means for feeding a painting sheet onto the female die parting surface; A clamper that is movable in a direction perpendicular to the female parting surface and presses and fixes the picture sheet to the female parting face, and a picture sheet pressed and fixed by the clamper to the female mold. A vacuum suction means for extending along the cavity, and a resin for injecting and filling a resin in a flowing state through a runner and a gate provided in the male mold into a cavity formed between the female mold and the male mold An injection means, and wherein the resin injected into the cavity and the painted sheet are laminated and integrated to obtain a laminated product, The number, position, shape, and number of the runners and gates such that a weld line formed by joining two or more flows of the resin in a flowing state is formed at a position off the corner of the laminated product. Effective passage area,
The injection molding simultaneous painting apparatus, wherein the temperature, flow rate, and the like of the resin in the fluidized state are set. 2. A heating plate for heating and softening the painting sheet pressed and fixed by the clamper is provided, and a heating temperature of the painting sheet by the heating plate is bonded and laminated to a portion where the weld line is formed. 2. The simultaneous injection molding and painting apparatus according to claim 1, wherein the height is set to be lower than a portion bonded and laminated on the corner portion. 3. A shielding plate is provided on a portion of the heating surface of the hot plate facing a portion of the painting sheet that is bonded and laminated to a portion where the weld line is formed. The simultaneous injection molding painting apparatus according to claim 2, wherein 4. A laminated product obtained by an injection molding and simultaneous painting apparatus, wherein a weld line is formed at a position off a corner.