JP2002046142A - Method and device for in-mold decorating injection molding - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method and a device for in-mold decorating injection molding, in which light-transmissive parts such as scale nameplates for measuring instruments can be fitted and fixed at the same time of in-mold decorating injection molding, and a strain, a slope and a positional shift or the like are not caused. SOLUTION: Such a male mold 30 is prepared that a projecting part 31c for forming a window is provided to form a window opening 1B in the rear side of light- transmissive parts in the molded body 1P of an injected resin. Also, the light- transmissive parts are arranged in the cavity 13 of a female mold 12 and a foil decorating sheet 2 is supplied on the parting face 14 of the female mold and fixed and held by a clamping means. Thereafter, the foil decorating sheet 2 is stretched so as to be stuck along the cavity 13 of the female mold 12 and mold clamping is performed. A resin is injected and filled in the inside of the molding cavity and the molded body 1P of the injected resin is integrated with the foil decorating sheet 2. A laminated product is taken out and the part blocking the window opening 1B out of the foil decorating sheet 2 covering the surface of the molded body 1P of the injected resin is removed and the light-penetrating part of the light-transmissive parts is exposed.

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 side 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.

[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]

By the way, laminated products to be obtained by simultaneous painting with injection molding include,
It has a transparent light transmitting portion that transmits light (illumination) from the back side in a scale / pattern form to improve visibility and the like.
It may be required to provide a light-transmitting component (light-transmitting portion) such as a scale dial for instruments. As described above, the following two methods have conventionally been adopted to provide a light-transmitting component (light-transmitting portion) such as a scale dial at a specific portion of a laminated product.

A first method is to obtain a laminated product 4 having a light-transmitting component 6 as shown in FIGS. 11 (A) and 11 (B).
As shown in FIG. 9, the painted sheet 5 having a wood grain pattern on the surface of the injection resin molded product 4P is bonded and laminated by the simultaneous painting method for injection molding as described in (a) to (i) above. A rectangular window opening 4A for retrofitting instrument panels and a step portion 4b for attaching a circular translucent component (scale dial) 6 having a scale character portion as a light transmitting portion.
An attached mounting hole 4B is provided. In this case, since the painted sheet 5 is bonded and laminated so as to cover the entire surface of the injection resin molded body 4P, after taking out the laminated product 4 ′ (unfinished product) from the male and female molds after the injection molding step, the painted sheet 5 is painted. In the sheet 5, the outer peripheral surplus portion 5C not adhered and laminated on the injection resin molded body 4P and the closed portions 5A and 5B closing the window opening 4A and the mounting hole 4B (the step portion 4b thereof) are cut off. Then, an adhesive or the like is applied to the outer periphery of the rear surface side of the translucent component (scale character plate) 6, and is pressed into the mounting hole 4B (the step portion 4b) to be fixedly attached (see FIGS. 10 and 11). In the first method, since the translucent component 6 needs to be attached and fixed to the laminated product 4 'after completion of the simultaneous painting with the injection molding, there is a problem that the number of steps is increased, labor is required, and the manufacturing cost is increased. .

[0008] The second method, as shown in FIG.
As the painted sheet 8, a light-transmitting portion (scale character portion) 9 is formed in advance in a specific portion of the decorative layer 8B in place of the grain pattern, and the painted sheet 8 is used as described above (a). The simultaneous painting method for injection molding as in (i)
As shown in FIG. 13, the painting sheet 8 is adhesively laminated on the surface of the injection molded resin body 7P, and a rectangular window opening 7A for retrofitting instrument panels is provided. In this case, a transparent resin (injection resin molded body 7P) to be injected and filled into the molding cavity in the injection molding step is used. Thus, the painted sheet 8 is bonded and laminated so that the entire surface of the transparent injection molded resin body 7P is covered, and the translucent portion (scale character portion) 9 is located at a specific portion. Thereafter, if the outer peripheral surplus portion 8C not adhered and laminated to the injection resin molded body 7P and the closed portion 8A closing the window opening 7A are cut off from the painted sheet 8, as shown in FIG. The laminated product 7 with the light part 9 is obtained. In this method, the vertical positioning marks Ma, Ma,... And the horizontal positioning marks Mb are previously formed on the painting sheet 8 (see FIG. 12), and these marks Ma, Mb are provided in the painting sheet supplying step. Is read by the sensor, and the positioning of the painting sheet 8 with respect to the female cavity 13 is performed. In the second method, a light-transmitting part (scale character part) 9 can be provided at the same time as simultaneous injection-molding painting without requiring a separate light-transmitting part. The production cost can be kept low.

However, in this method, the painted sheet 8
Is stretched in the stretching step, the light-transmitting portion 9 formed on the painting sheet 8 has an actual light-transmitting position with respect to an appropriate position and shape indicated by a virtual line F in FIG. There has been a problem that the portion 9 has problems such as distortion, inclination, and displacement. That is, the stretching direction and the stretching amount of the painted sheet 8 are not uniquely determined by the environmental conditions such as the temperature during injection molding and the preliminary molding prior thereto or the shape of the product, and it is extremely difficult to precisely control them. For example, when the vertical and horizontal dimensions of the laminated product 7 are 20 to 30 cm, distortion, inclination, misalignment, and the like of about 1 to 2 mm do not occur in the light-transmitting portion (scale character portion) 9 having a diameter of 30 to 50 mm. It is unavoidable, but it is 1-2m in translucent part (scale character part) 9
When a distortion, inclination, or misalignment of about m occurs, the misalignment between the back surface and the illumination light source degrades aesthetics and visibility, resulting in a defective product, and a low yield.

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 provide a specific portion on the surface of a laminated product in order to improve the visibility, etc. A light-transmitting part such as a scale dial plate for instruments, which has a transparent light-transmitting portion on a character or scale that transmits light, and has a light-shielding portion around the light-transmitting portion, is provided with a simultaneous drawing with simultaneous injection molding. It can be attached and fixed, and it does not cause distortion, inclination, misalignment, etc. in the translucent part such as the scale character part, without lowering the appearance and visibility, and can improve the yield,
An object of the present invention is to provide a method and apparatus for simultaneous painting by injection molding which can minimize the production cost.

[0011]

In order to achieve the above-mentioned object, a method for simultaneous painting by injection molding according to the present invention comprises the steps of: adhering and laminating a painting sheet on the surface of an injection molded resin article; Window formation for forming a window opening on the back side of the light-transmitting component in the injection-molded resin article, for bonding and laminating a light-transmitting component formed to have a light-transmitting portion made of characters and the like. A male mold provided with a convex part for use is prepared, and the translucent component can be attached and detached along a direction of taking out the laminated product at a specific portion of the female cavity opposite to the male part for forming a window. It is arranged in a state, a painting sheet is supplied on a female parting surface, and after the painting sheet is fixed and held on the female parting surface by clamping means, the painting sheet is placed in the female cavity. Along The female mold and the male mold are moved to the other side to perform mold clamping, and flow from the male mold side into a molding cavity formed between the female mold and the male mold. While injecting and filling the resin in the state, an injection resin molded body made of the resin and the painting sheet are laminated and integrated, and thereafter, the mold opening for separating the female mold and the male mold is performed, and the painting is performed. The laminated product in which the sheet and the light transmitting component are bonded and laminated is taken out from the female mold.

In the method of the present invention, it is preferable to use a resin having a light-shielding property as the resin in the flowing state (injection resin). In a further preferred aspect, the light-transmitting component is provided with an integrating means such as an adhesive, a pressure-sensitive adhesive, or a double-sided tape on an outer peripheral edge portion on a back surface side thereof for integration with the painted sheet. In the step of lamination and integration, the translucent component and the painted sheet are bonded and integrated only at the outer peripheral edge on the back side, and then,
A portion of the painted sheet covering the surface of the injection resin molded body, which closes the window opening, is cut off to expose a light transmitting portion of the light transmitting component.

[0013] Further, an injection molding simultaneous painting apparatus according to the present invention is for performing the above method, and is used for forming a window opening on the back side of the translucent part in the injection molded resin article. The translucent component is removably positioned and fixed along a male mold provided with a convex portion and a specific portion of the female mold cavity opposite to the male window forming convex portion along the laminate product removal direction. And a female mold provided with component positioning means for performing the positioning.

The component positioning means is preferably a fitting projection or a fitting hole into which a fitting hole or a fitting projection provided in the translucent component is removably fitted along the direction of taking out the laminated product. Is provided. In addition, as the component positioning means, a vacuum suction method, a magnetic suction method, or the like can be used in addition to the method using the fitting method.

In a preferred embodiment of the method and apparatus for simultaneous painting by injection molding according to the present invention having the above-described configuration, for example, a fitting hole provided in the translucent component is provided at a specific portion of the female cavity. There is provided a fitting protrusion which is removably fitted along the laminating product take-out direction, and the fitting protrusion has, for example, a light-shielding ink having a light transmitting portion such as a scale character on the back surface side. A translucent component made of a transparent resin molded product, glass, or the like, which is a display unit, is removably fitted along the direction in which the laminated product is taken out, and is positioned and fixed. After the decorative component is positioned and fixed in the fitting recess in this manner, a painted sheet is supplied onto the female parting surface (sheet supplying step), and the supplied painted sheet is clamped by the clamping means. After being fixed and held on the surface (clamping step), the painted sheet is stretched by vacuum suction means or the like so as to be closely adhered along the female mold cavity (stretching step or preforming step).

For this reason, even if a slight distortion, inclination, misalignment, or the like occurs in the proper position, that is, the translucent component due to the drawing sheet being stretched in the stretching step, the graduation is not required. There is no adverse effect on the light transmitting portion made of characters or the like. Therefore, without strictly controlling the positioning of the painted sheet, the stretching direction, the stretching amount, etc., it is possible to improve the yield without impairing the aesthetic appearance and visibility, and to reduce the manufacturing cost as much as possible. Can be. That is, as shown in FIG. 15 (A), the radius of the translucent component 3 is R0 + ΔR, the circumscribed radius of the scale character portion is R0, and as shown in FIG.
At the portion facing the light-transmitting component 3 at radius R0 + Δ
A light transmitting portion (transparent region) 2z having no R / 2 pattern is formed in advance. The positioning target is set such that the contour of the light transmitting portion (transparent region) 2z of the painted sheet 2 is located on a line having a radius R0 + ΔR / 2 from the center of the light transmitting component 3. As can be seen from FIG. 15A, the permissible errors are ΔY = ± ΔR / 2 and ΔZ = ± ΔR / 2 in the Y direction and the Z direction, respectively. As a result, the yield can be improved without impairing the appearance and visibility without strictly controlling the positioning, the stretching direction, the stretching amount, etc. of the painted sheet, and the production cost can be reduced as much as possible. be able to.

As described above, the laminated product in which the three components of the translucent component, the painted sheet, and the injection molded resin are integrated, is then attached to the male mold or by a take-out robot or an ejector pin or the like. It is taken out from the female mold in the mold opening direction. In this case, since the translucent component is removably fitted into the cavity of the female mold along the direction in which the laminated product is taken out (usually the mold opening direction), it is integrated with the painted sheet (surface of the laminated product) without leaving it. Is taken out.

In this case, the outer peripheral portion on the back side of the translucent component (in other words, the portion which is brought into contact with the peripheral portion of the window opening formed in the injection resin molded product via the painting sheet).
If an integrating means such as an adhesive is applied to the sheet, the translucent component is bonded and integrated to a specific portion of the surface of the painted sheet in the stretching step, and the painted sheet and the injection sheet are injected in a subsequent injection molding step. A laminated product is obtained in which the resin molded body is integrated, the translucent component is positioned and fixed at a specific portion thereof, and a window opening is formed on the back surface side of the translucent component in the injection resin molded body. In this case, after the injection molding step and the mold opening step, a portion of the painted sheet covering the surface of the injection molded resin body, which closes the window opening (light transmitting component), is cut off from the back side. Thus, the light transmitting portion of the light transmitting component is exposed. In the method apparatus according to this aspect, the light-transmitting component having the scale character portion and the like is positioned and fixed in advance in the female mold cavity, does not undergo deformation in the preforming process, and has heat and stress in the injection molding process. Because it eases, there is no undesired distortion, inclination, misalignment, etc. in the translucent parts. Use, even when the positioning of the painted sheet with respect to the female mold cavity is not performed, since the portion of the painted sheet that closes the window opening is cut off, the light transmitting portion of the light transmitting component is ultimately It is exposed.

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 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 a resin in a flowing state and a required book 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. In addition, a clamp is provided to fix and hold the picture sheet on the female parting surface. As the clamping means, a frame-shaped or cross-girder-shaped one can be used.

Further, in order to move the clamp means forward and backward with respect to the female parting surface, it is possible to use a molding driving force such as a mold clamping operation or to use the power of an ejector pin driving mechanism. This is accomplished 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.

Further, the apparatus of the present invention is preferably provided with a hot plate for performing preforming (stretching step). 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, 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. 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 can be used as the base sheet. 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.

As the resin for injection molding, ABS (acrylonitrile-butadiene-styrene copolymer) resin,
Polyolefin resin, polystyrene, polyvinyl chloride,
A thermoplastic resin such as an acrylic resin or a polycarbonate resin that is heated and melted to be in a liquid or fluid state, or a two-pack curing type or a catalyst-curing type resin, such as an uncured liquid such as a urethane resin or a polyester resin. Conventionally known materials can be used for simultaneous painting with injection molding.
It is selected according to the required physical properties and cost of the product.

In the method apparatus of the present invention, it is preferable to add a pigment (black: carbon black, iron black, brown: petal, white: titanium white, etc.) to the resin so that the resin has a light-shielding property. In addition, light leakage countermeasures (such as attaching a masking tape) can be eliminated.

[0027]

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 a simultaneous painting apparatus for injection molding according to the present invention. The laminated product 1 to be obtained by the simultaneous painting apparatus for injection molding 10 of the present embodiment is a panel having a rectangular shape and a U-shaped cross section in plan view, like the above-described conventional example (FIGS. 9 to 11). ,
A rectangular window opening 1A (FIG. 7) for retrofitting instrument panels and the like is formed at the upper center on the front surface side, and a painting sheet 2 is adhesively laminated on the surface of the injection resin molded product 1P (FIGS. 7 and 8). A circular light-transmitting component (a scale dial plate for instruments) having a scale character portion as a light transmitting portion is attached and laminated at the same time as the injection molding simultaneous drawing at the center lower part on the front side.

As shown in FIG. 2 and FIG. 8, the transparent component 3 is made of a transparent disk 3A made of polycarbonate having a thickness of 0.5 to 3 mm. The transparent (colorless transparent or colored transparent or translucent white, red, blue, yellow, etc.) scale mark character as the light transmitting portion 3e and the black light shielding portion 3 by silk printing or the like.
The display layer 3B made of f is formed, and a heat-sensitive adhesive layer 3g for integration with the picture sheet 2 is formed on the outer peripheral edge of the back surface. The light-shielding portion 3f is obtained by forming a light-shielding layer such as a black or white light-shielding ink or a metal thin film such as aluminum or chromium except for the light transmitting portion 3e.

In the center of the light-transmitting component 3, a fitting projection 90 as a positioning and fixing (preventing falling-off) means projecting from the bottom surface of the female mold cavity 13 described later is detachably fitted to the outside. A fitting hole 3c is formed, and a female cavity 13 is formed in a lower center part (outer peripheral part) on the surface side.
A positioning projection 3d to be fitted into the positioning recess 91 formed in the projection is formed to protrude.

Here, as the painting sheet 2, a base sheet made of an acrylic resin (having a thickness of 125 μm) and a decorative layer (one of an acrylic resin and a vinyl chloride-vinyl acetate copolymer) laminated thereon by a gravure printing method are used. : 1 weight ratio mixture as a binder resin, to which a pigment consisting of titanium white, red iron oxide, graphite, phthalocyanine blue, and carbon black is added) and an adhesive layer (vinyl chloride-vinyl acetate copolymer) In other words, a laminated sheet (laminate sheet) used as a final product while the base sheet is closely adhered to the injection resin molded product 1P is used (decorative layer / adhesive layer 2s). The decorative layer (pattern layer)
It is a wood grain pattern that combines three colors of the pattern version,
The adhesive layer is a layer having a thickness of 2 μm formed by using a gravure solid printing plate having a screen ruling of 40 lines / cm (plate depth 60 μm) twice (by gravure printing in two colors).

As shown in FIG. 3, vertical positioning marks Ma, Ma,... Are formed at predetermined intervals in the sheet supply direction (Z direction) on the painted sheet 2 as shown in FIG. A horizontal positioning mark Mb formed of a straight line is formed. The vertical positioning marks Ma, Ma,... Are read by a sensor 56 disposed on the upstream side of the female die 12 described later, and the horizontal positioning marks Mb are read by sensors disposed on the upstream and downstream sides of the female die 12. 57, 58, and based on the detection signals from those sensors 56, 57, 58,
Adjustment and positioning of the feeding amount of the sheet 2 with a picture are performed.

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 horizontally 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 the painting sheet (laminated sheet) 2 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 composed of a pair of nip rolls, and a guide roll 105. In addition to the above, in addition to the above, the open / close sandwiching type transport chuck 50 which grips a portion of the painted sheet 2 unwound from the unwinding machine 103 slightly upstream from the downstream end 2e 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 forward and straight from the initial position shown in FIG. 1 along the Z direction (vertical direction = sheet feeding direction). Be retreated. The unwinder 1
03, the sheet feeding roll 104, the guide roll 105, and the transport chuck 50 synchronize with each other in a state in which the painted sheet 2 is sandwiched, and the Y direction orthogonal to the width direction of the painted sheet 2, that is, the X direction and the Z direction (FIG. 4) You can move horizontally.

The downstream sheet fixing device 102 includes an opening / closing-type receiving / fixing chuck 60 that receives and holds and fixes the downstream end 2 e of the picture sheet 2 conveyed by the conveying chuck 50. And a support driving mechanism 65 for moving the chuck 60 in the width direction and the sheet supply direction of the painting sheet 2 so that the (downstream end 2e) of the painting sheet 2 can be moved in the width direction and the sheet supply direction. It has become.

A cavity 13 corresponding to the laminated product to be obtained is formed in the female mold 12, and the cavity 13 is used for vacuum suction so as to stretch the painting sheet 2 along the cavity 13. Are opened. The vacuum suction holes 15, 15,... Are formed through a vacuum suction passage 18 and a conduit 19, and a vacuum source (not shown) including an external vacuum pump or the like is provided. )
It is connected to the.

On the bottom surface of the cavity 13, there is formed a rectangular projection 8 for forming a window opening 1 A of the laminated product 1 to be obtained.
9 and a fitting projection 90 serving as a positioning and fixing (preventing falling-off) means is provided so that a fitting hole 3c formed in the center of the translucent component 3 is detachably fitted to the outside. Further, a positioning recess 91 into which the positioning protrusion 3d provided on the light transmitting component 3 is fitted is formed.

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. When the O-ring 22 is pressed against the parting surface 14 of the female die 12 with a rectangular frame-shaped or cross-girder-shaped clamper 20 having a shape viewed from the X direction, which will be described later, sandwiching the painting sheet 2 therebetween. 1
It serves to hermetically block 2 from the outside.

On the other hand, although not shown, the male mold 30 is fixed to a fixed platen on which a nozzle of an injection molding machine is mounted, and the male mold 30 has a convex shape corresponding to the laminated product shape. A core portion 31 is provided, and a runner 32 for injecting the molten resin and a gate 33 connected to the runner 32 are provided inside the core portion 31.

As can be clearly understood from FIG. 7, the convex core portion 31 is formed with concave portions 31a and 31b so as to face the rectangular convex portion 89 and the light transmitting component 3, and is formed by injection resin molding. A window forming projection 31c for forming a window opening 1B is provided on the back side of the light transmitting component 3 in the body 1P.

In order to press and fix the supplied one-shot sheet 2 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, a hot platen 80 as shown in FIG. 5 is provided for preforming. The hot platen 80 is moved by a hot platen transfer means 81 such as an air cylinder from a standby position outside the male and female molds to a heated position for the painted sheet on the parting surface 14 of the female mold 12 to transfer the painted sheet 2. It is designed to be softened by heating. In the example of FIG. 5, the hot platen 80 is a non-contact heating method using infrared radiation, but may be a contact heating method using heat conduction by bringing it into contact with a painted sheet. Further, a cutting blade 85 is provided at the upper end of the hot platen 80 for cutting the painted sheet 2 in the width direction when moved to the painted sheet heating position. A receiving groove 86 for receiving the cutting blade 85 is formed near the upper end of the female die 12.

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, as shown in FIG. 2, the fitting hole 3c and the positioning protrusion 3d of the light transmitting component 3 are fitted into the fitting convex portion 90 and the positioning concave portion 91 formed on the bottom surface of the female cavity 13 to perform positioning. Fix it.

After the translucent component 3 is positioned and fixed in this manner, the transport chuck 50 is lowered to supply one shot of the painted sheet 2 between the female parting surface 14 and the clamper 20. A supply step is performed (FIGS. 3 and 4), and then, as shown in FIG. 5, a clamp step of holding the picture sheet 2 on the parting surface 14 of the female mold 12 by the clamper 20 is performed.

Subsequently, the hot platen 80 is moved onto the painted sheet 2 pressed and fixed by the clamper 20, and is brought close to the female parting surface 14, and is moved by the cutting blade 85 provided thereon. 2 for female mold 12
Cut near the upstream end and heat-soften the painted sheet 2 at the sheet heating position (illustrated position)
Vacuum suction is performed by vacuum suction means including a vacuum suction hole 15 opened in the female mold cavity 13 and the like, and the painted sheet 2 is stretched so as to be in close contact with the female mold cavity.

After the elongating step by the vacuum suction, the light transmitting part 3 is also sucked through the vacuum suction hole 15, so that the light transmitting part 3 is firmly fixed and the light transmitting part 3 is fixed. The painted sheet 2 is brought into close contact with the sheet. Then, as shown in FIG. 6, the female mold 12 is moved to the male mold 30 side, the mold is clamped between the male mold 30 and the female mold 12, and the transparent resin 1P flowing from the injection molding machine is removed. The molding cavity formed between the female mold 12 and the male mold 30 is injected and filled, and after the transparent resin is solidified, the male and female molds 12 and 30 are opened. Thereby, the painted sheet 2 is bonded and laminated on the surface of the injection resin molded body 1P, and the translucent component 3 is adhered and fixed to the surface of the painted sheet 2 so that the translucent component 3, the painted sheet 2, and the injection resin molded body 1P are formed. Thereafter, the laminated product 1 integrated with the three members is removed from the female mold 12 in the mold opening direction along with the male mold 30 or by a removal robot or an ejector pin. In this case, the translucent component 3 is detachably fitted into the cavity 13 of the female mold 12 along the direction of taking out the laminated product (usually the mold opening direction). It is taken out with it without being integrated (see FIG. 7).

Thereafter, as shown in FIG.
A portion 2B covering the window opening 1B of the painted sheet 2 covering the surface of the injection resin molded body 1P is cut off from the back side, and a light transmitting portion made of scale characters of the light transmitting component 9 is cut. (Central part) 3e is exposed. Pictured sheet 2
The portion 2B of the above that closes the window opening 1B can be easily removed because it is not bonded to any of the injection molded resin body 1P and the light transmitting component 3.

In this embodiment, since the translucent component 3 having the scale character portion and the like is positioned and fixed in the female cavity 13 in advance, it is possible that undesired distortion, inclination, misalignment, etc. may occur. In addition, a sheet having a normal grain pattern or the like, that is, a sheet that does not transmit light is used as the painted sheet 2, but a portion 2B of the painted sheet 2 that closes the window opening 1B is cut off. Therefore, the light transmitting portion 3e composed of the scale characters of the light transmitting component 3 is finally exposed.

For this reason, even if a slight distortion, inclination, misalignment, etc. occur in the proper position, that is, the translucent component 3 due to the drawing sheet 2 being stretched in the stretching step, The light transmitting portion 3e made of the scale characters or the like has no adverse effect. Therefore, without strictly controlling the positioning, the stretching direction, the stretching amount, and the like, of the painted sheet 2, it is possible to improve the yield without impairing the aesthetic appearance and visibility, and to suppress the manufacturing cost as much as possible. be able to.

[0052]

As will be understood from the above description, according to the method and apparatus for simultaneous painting by injection molding according to the present invention, a specific portion of the surface of the laminated product is applied from the back side to improve the visibility and the like. Light-transmitting parts such as scale dials for instruments, which have transparent light-transmitting parts that allow light (illumination) to pass through, can be attached and fixed at the same time as painting with simultaneous injection molding. , Tilt, misalignment, etc.
The yield can be improved without lowering the visibility, and the manufacturing cost can be suppressed as much as possible.

[Brief description of 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.

FIGS. 2A and 2B show a translucent component, wherein FIG. 2A is a plan view and FIG. 2B is a cross-sectional view before being mounted on a female mold cavity.

FIG. 3 is a schematic longitudinal sectional view for explaining a sheet supply step of the apparatus shown in FIG. 1;

FIG. 4 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. 5 is a schematic longitudinal sectional view for explaining a clamping step, a heating softening step, and a stretching step of the apparatus shown in FIG. 1;

FIG. 6 is a schematic longitudinal sectional view for explaining an injection molding process of the apparatus shown in FIG. 1;

FIG. 7 is a schematic enlarged longitudinal sectional view showing a completed state of the injection molding process of the apparatus shown in FIG. 1;

8 is an enlarged view of a main part of the laminated product obtained from the apparatus shown in FIG. 1, (A) a plan view of the main part, and (B) a longitudinal sectional view of the main part.

FIG. 9 is a diagram provided for explanation of a first conventional method in which a light-transmitting component (light-transmitting portion) such as a scale dial is provided at a specific portion of a laminated product.

FIG. 10 is a diagram which is used for describing a translucent component mounting stage of the first conventional method.

FIG. 11 is a view showing a laminated product with a light-transmitting component obtained by the first conventional method.

FIG. 12 is a diagram showing a painted sheet used in a second conventional method when a light-transmitting component (light-transmitting portion) such as a scale dial is provided at a specific portion of a laminated product.

FIG. 13 is a schematic longitudinal sectional view showing a laminated product obtained by a second conventional method.

FIG. 14 is an enlarged view showing a main part of a laminated product with a light-transmitting portion obtained by a second conventional method.

FIG. 15 is a diagram for explaining the positioning accuracy of the light transmitting component and the (painting sheet) light transmitting part by the method and apparatus of the present invention shown in FIGS. 1 to 8;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Laminated product 1P Injection resin molded body 2 Painting sheet 1B Window opening 3 Translucent part 3e Light transmission part 10 Injection molding simultaneous painting apparatus 12 Female mold 13 Cavity 14 Parting surface 15 Vacuum suction hole 20 Clamper 30 Male mold 31c Window opening formation Convex part

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 4F202 CA11 CB01 CB19 CK06 CK18 CK25 CK35 CK52 CK84 CL09 CN21 CP06 CQ01 CQ05 CQ07 4F206 AD03 AD05 AD09 AD20 AG03 AG21 AH42 JA07 JB19 JF05 JF06 JF23 JL02 JN25

Claims (5)

[Claims] 1. A method for bonding and laminating a painting sheet on the surface of an injection resin molded article and laminating a light-transmitting component having a light-shielding layer formed to have a light-transmitting portion made of transparent scale characters or the like. Injection molding simultaneous painting method, wherein a male mold provided with a window forming convex portion for forming a window opening on the back side of the light-transmitting component in the injection resin molded body is prepared, and a female mold is provided. The translucent component is detachably arranged along a direction in which the laminated product is taken out at a specific portion of the cavity opposite to the male window forming projection, and a painted sheet is supplied on the female parting surface. Then, after the painting sheet is fixed and held on the female parting surface by clamping means, the painting sheet is stretched so as to be in close contact with the cavity of the female mold, and the female mold and the male mold are stretched. One for the other The mold is moved to the mold, and the resin in the fluid state is injected and filled from the male mold side into the molding cavity formed between the female mold and the male mold, and an injection resin molded body made of the resin is formed. The painted sheet is laminated and integrated, and then the mold is opened to separate the female mold and the male mold, and the laminated product in which the painted sheet and the light-transmitting component are adhesively laminated is taken out of the female mold. A simultaneous painting method for injection molding. 2. The simultaneous painting method for injection molding according to claim 1, wherein the resin in a flowing state has a light shielding property. 3. The light-transmitting component having a back side outer peripheral edge provided with an integrating means such as an adhesive, a pressure-sensitive adhesive, or a double-sided tape for integrating with the painting sheet. In the step of lamination and integration, the light-transmitting component and the painted sheet are bonded and integrated only at the outer peripheral edge of the back side, and thereafter, the surface of the injection resin molded body is covered. 3. The simultaneous injection molding painting method according to claim 1, wherein a portion of the painting sheet that closes the window opening is cut off to expose a light transmitting portion of the light transmitting component. 4. 4. An injection molding simultaneous painting apparatus for carrying out the method according to claim 1, wherein a window opening is formed on the back side of the light transmitting part in the injection molded resin body. The light-transmitting component is attached and detached along a direction of taking out the laminated product at a specific portion of the female mold cavity opposite to the male mold provided with the window-forming protrusion. A simultaneous injection molding and painting apparatus, comprising: a female die provided with component positioning means for positioning and fixing as much as possible. 5. The component positioning means includes a fitting protrusion or a fitting hole into which a fitting hole or a fitting protrusion provided in the light-transmitting component is removably fitted along the direction of taking out the laminated product. 5. The simultaneous injection molding and painting apparatus according to claim 4, wherein the apparatus is provided.