JPH11170293A - Injection molding simultaneous in-mold decoration device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To feed a sheet stably and efficiently and feed an in-mold decorative sheet properly and quickly even in the case a parting face of a female mold is formed into a protruded face or a bending face as a whole. SOLUTION: A device is provided with two units of endless annular clamping belts 1, 1 forming a pair, front and rear, in the width direction and composed of an elastic body such as rubber and provided with elasticity and flexibility for clamping both ends in width direction of one shot portion of an in-mold decorative sheet S as a sheet feed means, and a rotating and circulating means such as sprocket wheels 60, 76, 55, 56 and the like moving two units of endless annular clamping belts 1, 1 along a parting face of a female mold and rotating and circulating them.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

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

[0002]

2. Description of the Related Art 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]

When performing simultaneous injection molding painting, as described above in (a), first, a painting sheet is supplied onto a female parting surface used for injection molding. The sheet supply step is indispensable, and automation of this sheet supply step has been conventionally promoted. As a sheet supply mode, a sheet with a picture is wound into a roll by using an unwinding machine and a winding machine. A mode in which a required amount (each shot) is supplied in a roll / roll system from the state of the continuous continuous strip-shaped sheet taken (see Japanese Patent Application Laid-Open No. 5-318523), and a sheet cut in advance to a predetermined size. (Refer to Japanese Patent Application Laid-Open No. 7-241873, etc.) is known.

However, in the above-mentioned sheet supply mode, when the female parting surface is a flat surface (flat surface), it is desired to supply the sheet more stably and efficiently, but it is not so large. Although no problem occurs, in the injection molding simultaneous painting apparatus, depending on the shape of the laminated product (product) to be obtained, there is a case where the parting surface has to be entirely convexly curved, In this case, the following problem occurs.

That is, for example, when a product having a large curvature (such as a deep drawing shape) is to be obtained, a painted sheet fixed and held on a flat parting surface is stretched along the deep drawing cavity. The amount of displacement and distortion of the painted sheet during stretching becomes large, and the painted sheet is likely to be distorted or broken.If the molding conditions such as heat and pressure are relaxed to avoid it, distortion and tear will occur. Instead, there arises a problem that it is difficult to bring the painted sheet completely in contact with the cavity.

However, as described above, when the female parting surface is a curved surface having a convex shape as a whole, in the above-described conventional sheet supply mode, the painted sheet is properly applied to the female parting surface. , And a large gap is formed between the painted sheet and the outer peripheral portion of the parting surface, so that the subsequent clamping step, stretching step, and the like cannot be performed.

Therefore, in order to solve the above problems,
As disclosed in Japanese Patent Application Laid-Open No. 9-39025, the female parting surface is made to have a large curvature (deep drawing) corresponding to the shape of the product to be obtained and as a whole a convex or concave curved surface. It is conceived that even when obtaining a product (such as a shape), it is not necessary to make the depth of the cavity bottom from the parting surface so deep (see FIGS. 1 to 1 showing an embodiment of the present invention described later). See FIG. In FIG.
Reference numeral 2 denotes a female part, and reference numeral 14 (14a, 14b) denotes a parting surface curved to a convex surface. ]. However, in the case of the present invention, there is a problem that a groove is cut into a parting surface of a narrow space, and a complicated mechanism for conveying a sheet with a picture is required.

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 relatively simple mechanism which does not require machining of grooves or the like on a female parting surface. The sheet can be supplied more stably and efficiently at a proper speed, and in particular, even when the female parting surface is entirely a curved convex surface, the painted sheet can be properly and promptly supplied. An object of the present invention is to provide a simultaneous painting apparatus for injection molding which can be supplied and can prevent an excessive change and distortion of a painted sheet accompanying a stretching step.

[0012]

SUMMARY OF THE INVENTION In order to achieve the above-mentioned object, an injection molding simultaneous painting apparatus according to the present invention basically comprises a female mold, a male mold and a parting surface of the female mold. A sheet supply unit for supplying a painting sheet; and a clamp unit for fixing and holding the painting sheet on the female parting surface, wherein the sheet supply unit is arranged in a width direction for one shot of the painting sheet. A pair of front and back endless annular holding belts in the width direction, and two sets of endless annular holding belts in the width direction, each of which is made of an elastic body having elasticity and flexibility capable of holding both ends. And a rotation circulating means such as a sprocket wheel that rotates and circulates over the parting surface. The present invention can be applied to a case where the female parting surface is a flat surface, but is particularly suitable when the whole of the female parting surface is a curved surface having a substantially convex surface.

In a preferred embodiment of the simultaneous painting apparatus for injection molding according to the present invention, the endless annular holding belt is moved substantially along the parting surface of the female mold. In another preferred embodiment, a guide for increasing the width of the two sets of endless annular holding belts in the width direction in the width direction is provided on the upstream side in the sheet feeding direction of the female die so as to impart a tension in the width direction to the painted sheet. Means are attached.

Further, in a preferred mode, the painted sheet is conveyed onto the female parting surface while being sandwiched by the two sets of endless annular sandwiching belts in the width direction of the front and back sides, and the clamping means is provided. After being fixed and held on the parting surface of the female mold, the female mold is provided with release means for vertically opening the endless annular clamping belt in order to release the painting sheet from the endless annular clamping belt. .

In a preferred embodiment of the simultaneous injection molding apparatus of the present invention having the above-described structure, the painting sheet (1
The sheet for the shot) is clamped at both ends thereof by a pair of front and back endless annular holding belts at the upstream side in the sheet feeding direction of the female die. It is transported onto the parting surface of the mold.

In this case, in a preferred embodiment, the width of the two sets of endless annular holding belts in the width direction is increased in the width direction by guide means attached to the upstream side of the female mold, and accordingly, the painted sheet is The tension in the width direction is applied to the sheet, the loosening of the painted sheet is performed, and then, even if the entire parting surface of the female mold is a curved surface having a substantially convex shape, the endless annular holding belt is, for example, a guide roller, etc. And is moved substantially along the female parting surface. Along with that, the painting sheet is also transported along the female parting surface and stopped just above the parting surface.

Subsequently, the painting sheet is fixed and held on the female parting surface by clamping means. Immediately thereafter, in a preferred embodiment, two sets of endless annular sandwiching belts are opened in a front-to-back direction in a pair of front-to-back width directions by a release means attached to the female mold, and the painted sheet is released. Next, the endless annular holding belt is circulated and moved on the female parting surface in a state where it is opened in a front-to-back direction (a state in which the painting sheet is released). Both end portions in the width direction of the next shot of the sheet are held by the endless annular holding belt and are kept on standby.

Subsequently, the picture sheet released from the endless annular holding belt is heated and softened by a hot plate or the like while the outer peripheral portion thereof is fixed and held on the female parting surface by a clamp means (heating). Softening step), followed by
The film is stretched along the cavity of the female mold by vacuum suction and / or air supply (stretching step).

Thereafter, as in the prior art, 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, and the female mold and the male mold. An injection molding process in which a resin (melt resin, etc.) in a flowing state is injected and filled from the male mold side into a cavity formed between the mold and solidified to perform injection molding, a mold opening for separating the female mold and the male mold. Process, a sheet trimming process of separating a portion of the painted sheet to be attached to the injection resin molded body from another portion (excess portion), and a removing process of taking out a laminated product having the painted sheet bonded and laminated from the male and female molds Then, a laminated product (product) in which the painted sheet is laminated on the injection resin molded body is obtained.

According to the apparatus of the present invention, since the sheet with the picture is conveyed and supplied by the endless annular holding belt, the sheet can be supplied more stably and efficiently. Even if the parting surface is a curved surface having a convex surface as a whole, the painting sheet can be supplied properly and promptly. Therefore,
Even if the product to be obtained has a large curvature (such as a deep drawing shape), it is not necessary to make the female mold cavity so deep from the parting surface, so that the painted sheet can be hardly distorted or broken. Without relaxing the molding conditions such as heat and pressure, the painted sheet can be brought into close contact with the cavity, and a good quality product can be reliably obtained.

In the present invention, the male and female molds are made of metal such as iron or ceramics, and are provided with small holes (vacuum suction holes or the like) for vacuum suction or compressed air supply as required. Further, the female mold is constituted by an aggregate of a plurality of divided 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 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, a clamp means is provided for fixing and holding the painting sheet on the female parting surface. 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. Also, the release means for vertically opening the endless annular holding belt attached to the apparatus of the present invention can use the driving force of an ejector pin drive mechanism as its clamping force, similarly to the clamp means. In addition, it is performed by separately providing a driving means such as a fluid pressure actuator.

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

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. 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 thermoplastic or 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.

[0027]

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.
Is a side view showing a female mold peripheral part, FIG. 3 is a plan view showing a female mold peripheral part, FIG. 4 is a perspective view showing a female mold peripheral part, and FIG. 5 is a plan view showing an upstream part of the female mold. . The simultaneous injection molding painting apparatus 10 of the present embodiment includes a female mold 12 and a male mold 25 as shown in FIG. The mold 12 and the male mold 25 are provided with cavities 13 and 26, each of which has a relatively shallow side view and has a generally "U" shape, corresponding to the shape of the laminate to be obtained.

The female die 12 has its bottom fixed to the movable platen 11 and moves forward and backward by the ram 16 of the fluid pressure cylinder 15 in a horizontal direction, in other words, in a direction approaching / separating from the male die 25. It has been. In the present embodiment, the female die 12 is a movable die as described above and is configured to move in the horizontal direction. However, the present invention is not limited to this. It is also possible to adopt a form in which one of them is vertically opposed and one of them is moved in the vertical direction.

As can be clearly understood from FIG. 4, the parting surface 14 of the female mold 12 has upper and lower end surfaces 1 which are flat.
4a and a mountain-like portion 14b, which is located on both sides of the cavity and has a substantially "L" shape in side view, and has a generally convex curved surface as a whole. The female mold 12 has
As can be clearly understood from FIG.
Are provided at a predetermined pitch, and the female vacuum suction holes 17, 1,.
7, ... are connected to a vacuum tank and a vacuum pump as a vacuum source provided outside through a vacuum suction passage, a conduit, though not shown.

Further, the female mold 12 has a picture sheet S
To press and fix the parting surface 14 of the female mold 12 to the parting surface 14 of the female mold 12 (14a, 14a).
A clamper 20 similar to b) and having a rectangular frame shape when viewed from the front and a substantially "C" shape when viewed from the side is provided. The clamper 20 is driven by a drive mechanism (not shown) with four connecting rods 24 slidably fitted in through holes provided near four corners of the female mold 12 to a parting surface 14 of the female mold 12. To move back and forth in the vertical direction.

The female mold 12 has the cavity 13
Is provided with an annular groove 23 in which the O-ring 22 is mounted. The O-ring 22 is formed by the frame-shaped clamper 20 having a female mold 1 with a painting sheet S interposed therebetween.
When pressed against the second parting surface 14, it serves to hermetically shut off the cavity 12 from the outside.

On the other hand, the male mold 25 is fixed to a fixed platen (not shown) on which a nozzle of the injection molding machine is mounted. The male mold 25 is provided with a molten resin from the nozzle of the injection molding machine. Cavity space 3 via runner not shown
(FIG. 7), two gates 28 for injection are provided, and a parting surface is provided on the parting surface 14 of the female die 12 so as to be in contact with the painting sheet S therebetween. On both sides of the surface, cutout recesses 29 are provided so as to be able to accommodate the clamper 20 and a pair of left and right endless annular holding belts 1 and 1 described later in a mold clamping state shown in FIG.

The laminate to be obtained by the simultaneous painting apparatus for injection molding 10 of the present embodiment is a panel having a rectangular shape in plan view and a cross-section in the shape of a square. Then, an acrylic resin base sheet (125 μm thick), a decorative layer (a 1: 1 weight ratio mixture of acrylic resin and vinyl chloride-vinyl acetate copolymer) laminated thereon by a gravure printing method, and an adhesive An adhesive layer (a vinyl chloride-vinyl acetate copolymer system) is used, and a laminated sheet (laminated sheet) used as a final product while the base sheet is closely adhered to the injection resin molded body Pa is used. The decorative layer (pattern layer) has a pattern
The adhesive layer was formed twice (by gravure printing in two colors) using a gravure solid printing plate (plate depth: 60 μm) having a screen ruling of 40 lines / cm. This is a layer having a thickness of 2 μm.

In addition to the female mold 12 and the male mold 25 described above,
In the simultaneous injection molding painting apparatus 10 of the present embodiment, an unwinding machine RS loaded with a long strip-shaped painting sheet S wound in a roll shape diagonally to the upper right of the female mold 12 and a pair of upper and lower feed rollers 31 , 31 are provided, and the unwinder RS and a pair of rotationally driven feed rollers 3 are provided.
As a sheet supply means for supplying one shot of the painted sheet S sent from the first and 31 onto the parting surface 14 of the female mold 12, the pictorial sheet S is received, pinched and transported on the upstream side of the female mold 12. As shown in FIG. 8, the front and back directions of the painted sheet S as shown in FIG. 8 are made of an elastic body such as rubber having elasticity and flexibility capable of sandwiching one end of the painted sheet S in the width direction for one shot. In the (normal direction N), two sets of endless annular holding belts 1 each including a pair of endless annular belts 1a and 1b are provided at both ends in the width direction T of the painting sheet S. A pair of left and right sprocket wheels 60 around which the annular clamping belts 1 and 1 are wound to move the annular clamping belts 1 and 1 substantially along the parting surface 14 of the female mold 12 to rotate and circulate (here, counterclockwise). , 70, 7 And rotating the circulation means such as guide rollers 55,56,65 is provided.

The width of the belt 1a on the front side (opposite side of the female type) of the endless annular holding belt 1 is set so that it can be easily opened by release means described later, as shown in FIG. The width of the belt 1b on the side (female side) is made larger than the width of the belt 1b, and the rear surface of the lower belt 1b and the sprocket wheels 60, 70, 75 are made to be less likely to slip between them. Appropriate uneven teeth (mesh teeth) or minute embossed unevenness are formed.

A pair of left and right sprocket wheels 60 located downstream of the female die 12 in the sheet feeding direction are
It is for turning by 180 ° and is driven to rotate by a rotary driving means such as a motor, and can be moved up and down (Z direction in the figure) to adjust the tension of the endless annular holding belts 1 and 1. ing. The endless annular holding belts 1, 1, which have been turned 180 ° by the pair of sprocket wheels 60 in the width direction, are connected to the female mold 1.
The guide roller 65 is guided to a guide roller 65 above the female die 12 through a vertical hole 62 penetrating the lower part of the second mold 2.

A pair of right and left sprocket wheels 76 located right above the female die 12 are for turning 90 degrees, and as can be clearly understood from FIG. A drum 75 for loosening the sheet S in the length direction is interposed.

The sprocket wheel 70 on the right side (downstream side) in FIG. 1 of the sprocket wheel 76 for turning 90 degrees is for turning 180 degrees. The endless annular holding belts 1, 1 are sandwiched between the holding belts 1, 1,
A separating member 77 for separating the upper belt 1a from the lower belt 1b slightly upward is provided.
Further, the sprocket wheel 7 for turning 90 degrees is used.
6 and the aforementioned sprocket wheel 7 for turning by 180 °
0 between the upper belt 1a and the upper belt 1a.
And a pair of pressing rollers 7 that press the upper and lower belts 1b and 1b again so as to contact each other with the picture sheet S interposed therebetween.
4, 74 are arranged.

In addition, before and after the sprocket wheel 70 provided with the separating member 77, a picture sheet S sent from the unwinder RS and the feed rollers 31, 31 is provided.
, The front movable chuck 36 that moves the endless annular holding belts 1, 1 to the vicinity of the pressing rollers 74, 74 at the same speed as the endless annular holding belts 1, 1, the rear end of one shot of the picture sheet S , The rear movable chuck 35 that moves to a predetermined position at the same speed as the endless annular holding belts 1, 1, a cutter 34 that cuts a rear end portion of one shot of the picture sheet S, and the picture sheet. A fixing chuck 32 for holding and fixing the feed rollers 31, 31 from a portion where S is cut off by the cutter 34 is provided.

Further, as can be understood from FIG. 5, between the pressing rollers 74, 74 and the sprocket wheels 70, 70, as described later, the upstream side of the female die 12 in the sheet feeding direction. The endless annular holding belt 1 in a state where the width in the width direction is widened by the pair of right and left guide members 51, 51, 52, 52 in order to impart the width in the width direction to the painted sheet S. 1, two sets of guide members 72, 72, 73, 73 are disposed on the left and right sides so as to reset the left and right intervals to the extent that both ends in the width direction of the picture sheet S can be clamped.

Accordingly, when the painted sheet S is conveyed to the vicinity of the pressing rollers 74 with its leading end portion being held by the front movable chuck 36, the front side belt 1a and the back side belt 1b are separated from each other. Both ends in the width direction are inserted between the belts 1a-1b of the endless annular holding belt 1 separated by the tools 77, 77, and a total of two sets of endless members in the width direction are provided before the pressing rollers 74, 74. In a state where the entire lengths of both end portions are held by the annular holding belts 1, 1, the endless annular holding belts 1, 1 are moved.

On the other hand, near the upper and lower ends of the female mold 12 in the sheet feeding direction, the endless annular clamping belts 1 are attached to the female mold 12 as shown in FIGS. Guide rollers 55 and 56 are provided for pressing the upper surface of the endless annular holding belts 1 and 1 (belt 1 a) so as to move substantially along the surface 14. On the front side of the guide roller 55, a pair of front and back sides as guide means for increasing the width of the two sets of endless annular holding belts 1 and 1 in the width direction in the width direction so as to apply the tension in the width direction to the painted sheet S. In the width direction, two sets of guide members 51, 51, 52, 52 are provided.

On the female mold 12, the painted sheet S is held on the parting surface 14 of the female mold 12 in a state where it is sandwiched between the pair of endless annular sandwiching belts 1, 1 in the width direction of the front and back sides. 9A, and is fixed and held on the parting surface 14 of the female mold 12 by the clamper 20. Then, in order to release the painting sheet S from the endless annular holding belts 1, 1, FIG. (B), the left and right release plates 45, 45 for opening the endless annular holding belts 1, 1 in the front-to-back direction, that is, lifting the front-side belt 1a and separating from the back-side belt 1b, and connecting them. Two operation rods 44, 44 which are moved up and down at a predetermined timing are provided. The release plates 45, 45 use the driving force of an ejector pin drive mechanism via the operation rods 44, 44, for example, similarly to the clamper 20.

In the simultaneous injection molding apparatus 10 of the present embodiment having the above-described configuration, the painting sheet S (one sheet sheet for one shot) is placed upstream of the female mold 12 as described above. The two ends are held between a pair of endless annular holding belts 1, 1, and in this state, the endless annular holding belts 1, 1 are conveyed to the parting surface 14 of the female mold 12 by the rotating and circulating motion.

In this case, guide members 51 and 52 provided on the upstream side of the female die 12 can increase the width of the two sets of endless annular holding belts 1 and 1 in the width direction in the width direction.
Accordingly, tension in the width direction is applied to the painted sheet S, the slack of the painted sheet S is removed, and subsequently, even if the entire parting surface 14 of the female mold 12 is a curved surface having a substantially convex surface. The endless annular holding belts 1, 1 are guided by guide rollers 55, 56 and the like, and are moved substantially along the parting surface 14 of the female mold 12. Along with that, the painting sheet is also transported along the female parting surface and stopped just above the parting surface. In this case, the endless annular holding belts 1, 1 and the female mold 12
In order to reduce the frictional force between the parting surface 14 and
The endless annular holding belts 1 and 1 are in contact with only the vicinity of the top of the parting surface 14 and are slightly separated from the upper and lower ends thereof.

Subsequently, the sheet S with the picture is attached to the clamper 20.
As a result, it is fixed and held on the parting surface 14 of the female mold 12. Immediately thereafter, as shown in FIG.
Is lifted, and the two sets of endless annular sandwiching belts 1 and 1 are opened in the front and back direction in a pair of width directions on the front and back sides, and the picture sheet S is released. Next, the endless annular clamping belts 1, 1
4, as shown in FIG. 9B, is circulated and moved in a state of being opened in the front and back directions (a state in which the painting sheet S is released), and at the same time, the painting is performed on the upstream side of the female mold 12. Both ends in the width direction of the next shot of the sheet S are held by the endless annular holding belts 1 and 1 and are put on standby.

Subsequently, the picture sheet S released from the endless annular sandwiching belts 1, 1 is fixed to and held on the parting surface 14 of the female mold 12 by the clamper 20 at the outer periphery thereof, as shown in FIGS. As shown in FIG. 6, the heating plate 40 is heated and softened by the hot platen 40 moved onto the female parting surface 14 by the fluid pressure cylinder 42 (heating softening step). The heating surface of this hot plate has the same shape as the curved shape of the fixed and held painting sheet, and heats the painting sheet by infrared radiation from a position away from the painting sheet. Subsequently, the female mold 12 is stretched along the cavity 13 by vacuum suction through the vacuum suction hole 17 (stretching step).

Thereafter, as in the conventional case, the female mold 12 is moved to the male mold 25 side to perform mold clamping.
Male mold 2 in cavity 3 formed between
5, an injection molding step of injecting and filling a resin (molten resin) P in a flowing state through cooling and solidifying to perform injection molding (FIG. 7), and a mold opening step of separating the female mold 12 and the male mold 25. 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 another portion (excess portion), and taking out a laminated product on which the painted sheet S is adhesively laminated from both the male and female molds Through the steps, a laminated product (product) in which the painted sheet is laminated on the injection resin molded body is obtained.

According to the apparatus of this embodiment, the painting sheet S is conveyed and fed by the endless annular holding belts 1 and 1, so that the painting sheet S is supplied more stably and efficiently. In particular, even when the parting surface 14 of the female mold 12 is a curved surface having a convex shape as a whole, the painting sheet can be supplied properly and promptly.

Therefore, even if the product to be obtained has a large curvature (such as a deep drawing shape), the female mold cavity does not have to be so deep from the parting surface.
It is possible to make the painted sheet less likely to be distorted and torn, etc., and it is possible to adhere the painted sheet along the cavity without relaxing the molding conditions such as heat and pressure, and it is possible to reliably obtain good quality products. it can. Also, it is not necessary to form grooves in the narrow female parting surface.

The present invention is particularly effective when the female parting surface is convexly curved as shown in FIG. 4 as in the above embodiment. Needless to say, it can be applied to the case.

[0052]

As will be understood from the above description, according to the simultaneous painting apparatus for injection molding according to the present invention, since the painted sheet is conveyed and supplied by the endless annular holding belt, the supply of the sheet is performed. It can be performed more stably and efficiently, and in particular, even when the female parting surface is a curved surface of a convex surface as a whole, the painting sheet can be appropriately and properly formed along the parting surface. It can be supplied quickly, so that even if the product to be obtained has a large curvature (such as a deep drawing shape), the female cavity does not have to be so deep from the parting surface.
It is possible to make the painted sheet less likely to be distorted and torn, etc., and it is possible to adhere the painted sheet along the cavity without relaxing the molding conditions such as heat and pressure, and it is possible to reliably obtain good quality products. it can. Further, there is no need to form grooves on the left and right parting surfaces of the narrow female mold, and the sheet conveying mechanism with pictures is relatively simple.

[Brief description of the drawings]

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

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

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

FIG. 4 is a perspective view showing a female peripheral portion shown in FIG. 1;

FIG. 5 is a plan view showing an upstream portion of the female mold shown in FIG. 1;

FIG. 6 is a diagram for explaining a stretching step and a heating softening step of the apparatus shown in FIG. 1;

FIG. 7 is a diagram for explaining a mold clamping step and an injection molding step of the apparatus shown in FIG. 1;

FIG. 8 is a diagram which is used for describing a state of holding a painted sheet by an endless annular holding belt of the apparatus shown in FIG. 1;

FIG. 9 is a diagram which is used for describing a release unit that opens the endless annular holding belt of the device shown in FIG. 1 up and down.

[Explanation of symbols]

 S Painted sheet P Laminated product 1 Endless annular clamping belt 10 Injection molding simultaneous painting device 12 Female mold 13 Cavity 14 Parting surface 17 Vacuum suction hole 20 Clamper 25 Male mold 35, 36 Chuck 45 Release plate 60, 70, 76 Sprocket wheel 55 , 56, 65 Guide roller 51, 52, 72, 73 Guide member

Claims (5)

[Claims] 1. A female supply unit, a male supply unit, a sheet supply unit for supplying a painting sheet on the female parting surface, and a clamp unit for fixing and holding the painting sheet on the female parting surface. The sheet supply means comprises an elastic body having elasticity and flexibility capable of holding both ends in the width direction of one shot of the painted sheet. An endless annular holding belt, and a rotation circulating means such as a sprocket wheel for rotating and circulating two sets of endless annular holding belts in the width direction so as to pass over the female parting surface. Injection molding simultaneous painting equipment characterized by the following. 2. The simultaneous injection molding and painting apparatus according to claim 1, wherein the entire parting surface of the female mold is a curved surface having a substantially convex shape. 3. The simultaneous injection molding and painting apparatus according to claim 1, wherein the endless annular clamping belt is moved substantially along the female parting surface. 4. A guide means for increasing the width of the two sets of endless annular holding belts in the width direction in the width direction is provided on the upstream side in the sheet feeding direction of the female die so as to apply tension in the width direction to the painted sheet. The simultaneous injection molding and painting apparatus according to any one of claims 1 to 3, wherein the apparatus is attached. 5. The image-bearing sheet is conveyed onto the parting surface of the female mold while being sandwiched by two sets of endless annular holding belts in the width direction of the front and back sides, and the female mold is held by the clamping means. After being fixedly held on the parting surface, the female mold is provided with release means for opening the endless annular holding belt in a front-to-back direction so as to release the picture sheet from the endless annular holding belt. The simultaneous injection molding and painting apparatus according to any one of claims 1 to 4.