JP3483351B2 - Decorative sheet and method for molding decorative molded article using the decorative sheet - Google Patents

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a decorative sheet which is effectively used to simultaneously decorate a molded article with decorations such as patterns and characters, and a decorative sheet which is used to decorate both sides of the molded article simultaneously with molding. The present invention relates to a method for producing a double-sided decorative molded product, which is adapted to obtain a molded product subjected to the treatment.

[0002]

2. Description of the Related Art A decorative molded article is well known in which the surface of the molded article is decorated at the same time as the injection molding so as to obtain a molded article having a design or letters on its surface. Recently, some manufacturing methods have been considered in which not only the front surface (one surface) but also both surfaces (two front and back surfaces) are simultaneously decorated.

One of them is that only one surface is decorated at the time of injection molding of a molded product, and the other surface is decorated in another step after molding, or both surfaces are simultaneously decorated or both surfaces are decorated simultaneously or individually. It is a thing. However, this method requires a decoration step in addition to injection molding, and the number of steps is large, so that it cannot be said that the productivity is good.

Therefore, for example, Japanese Patent Publication No. 5-23172 proposes a method for producing a double-sided decorative molded article in which decoration is performed on both sides simultaneously with injection molding. As shown in FIG. 12, this method is performed by a pair of molds 1 s and 21 s having a convex shape and capable of being separated from each other.
Two decorative sheets As and Bs are located facing each other between 2s, and the decorative sheet is sandwiched by frame-shaped sandwiching plates 4s and 24s slidably provided on the outer peripheral wall 3s of the convex portion of the mold. At the same time, the two decorative sheets As in the cavity 7s formed by the molds 1s and 21s and the sandwiching plates 4s and 24s by clamping the mold,
Injection of synthetic resin between Bs, decoration at the same time as molding,
After that, the mold is opened to obtain a double-sided decorative synthetic resin molded product.

Conventionally, in a method for producing a double-sided decorative molded article in which decoration is performed on both sides simultaneously with such injection molding, the front side decorative sheet and the back side decorative sheet are supplied from separate winding rolls. Even with the above, the two decorative sheets As and Bs are the mold 1s,
The pulling rolls (cylindrical tubes) 9s and 29s attached to the machine frames 8s and 28s of 21s are individually arranged and wound on the winding rolls 10s and 30s, respectively.

[0006]

In the method for producing a double-sided decorative molded article as described above, various combinations can be used as the decorative sheet for the front surface and the back surface, and a molded article having a high designability or functionality can be obtained. Although it can be easily obtained, when the number of types of decorative sheets increases, a combination of the decorative sheets for the front surface and the back surface for the back surface is taken carelessly by the operator when installing the decorative sheets on the injection molding machine. It may happen that you make a mistake. In addition, it is necessary to arrange a total of four rolls, two drawing rolls and two take-up rolls, in the injection molding machine, and the space around the molding machine is exclusively used for the rolls, so that the work space is Will be difficult to secure.

In view of such a point, the present invention is a decoration sheet in which the combination of the decoration sheets used on both sides is not inadvertently mistaken when decoration is performed on both sides of the molded product simultaneously with the injection molding, and the same. It is an object to provide a method for producing a double-sided molded product using a decorative sheet.

[0008]

In order to achieve the above-mentioned object, the present invention discloses a decorative sheet characterized in that strip-shaped sheets of the same kind or different kinds are wound on the same tube in a superposed manner. . In the present invention, the decorative sheet is a decorative sheet comprising a base sheet and a decorative layer laminated on the base sheet, which is a so-called laminated sheet (film which is used as a final product by directly adhering and integrally forming with a molded product. ), Or a so-called transfer sheet (film) for peeling the base material sheet leaving only the decorative layer (transfer layer) on the molded product side after integrating the decorative sheet and the molded product, Further, the decoration may be a pattern layer containing a pattern such as wood grain or stone pattern, an entire colored coating film, a metal deposition layer on the whole surface or a partial area, and further, an antiglare coating layer, an antistatic layer. , Scratch-resistant cured coating, light diffusion layer,
It may be a functional coating layer such as a magnetic layer or a fluorescent layer. Further, it may be a so-called shaping sheet capable of shaping an uneven pattern.

The positions (front and back) of the decorative layers on both decorative sheets may be appropriately selected according to the desired application and required performance. When the decorative sheet is a transfer sheet, both decorative layers have a positional relationship facing each other, but when the decorative sheet is a laminated sheet, the decorative layers of the decorative sheets can be provided on either the front or back of the base sheet. As the base sheet, a thermoplastic resin such as polyvinyl chloride, acrylic, polystyrene, ABS resin, polycarbonate, polyester, polypropylene can be used.
It is practical that the thickness of the substrate sheet is usually about 20 to 500 μm.

The strip-shaped decorative sheets to be wound around the tubular tube at the same time may be the same or different. In addition, in order to improve the peeling of the decorative sheets after being pulled out, further, when the decorative layers are overlapped and wound, the decorative layers may adhere (block), or one or both of them may have an uneven pattern. In the case of the shaped sheet to be held, a release sheet (film) may be simultaneously wound as an intermediate layer in order to prevent the concavo-convex shape of the other side from being imprinted on the other side.

The present invention also provides a method for molding a decorative molded product using the above decorative sheet, in which the same or different first and second strip-shaped decorative sheets are overlapped and wound on the same cylindrical tube. The first and second decorative sheets are pulled out from the decorative sheet, and the first and second decorative sheets are arranged facing each other with a distance from each other in the cavity space between the first and second molds of the injection molding machine. The mold is clamped, and thereafter, a resin in a fluid state is injected and filled between the decorative sheets in the cavity space between the molds to solidify the resin, and then the first and second molds. Is opened, and a resin molded product whose front and back surfaces are decorated with the first and second decorative sheets is taken out from between the two molds.

In a preferred embodiment of the above method, an intermediate mold is arranged between the first mold and the second mold, the intermediate mold being separable from the first mold and having a double-sided opening cavity corresponding to the shape of the molded product to be obtained. At the same time, the first and second decorative sheets are arranged between the intermediate mold and the first and second molds, respectively, and the first decorative sheet is used as the first mold and the intermediate mold. The mold is clamped so that the second decorative sheet is sandwiched between the second mold and the intermediate mold, and then the resin in a fluid state is injected and filled into the cavity. After solidifying, the first and second molds are opened, and a resin molded product whose front and back surfaces are decorated with the first and second decorative sheets is taken out from the intermediate mold. To be

In the above-mentioned molding method of the present invention, the pair of molding dies can be moved to the intermediate mold side when one is a fixed mold and the other is a movable mold, and when an intermediate mold is used. Including the case of being movable. In addition, the intermediate type,
When the pair of molds is composed of a fixed mold and a movable mold, it may be movable to the fixed mold side, and when both of the pair of molds are movable, they may be fixed.

The molding surface of each mold and the intermediate mold used as needed (the outer shape of the molded product to be obtained) may be a flat surface, a convex surface or a concave surface. , Metals such as copper, or porous ceramics,
A material made of a known material such as a porous metal can be used.
When the mold is made of a porous material, the hole can be used as an intake passage for vacuum-sucking the decorative sheet.

The runner (runner) for injecting and filling the molten resin into the cavity (molding cavity) may be provided in one of the molds (usually the fixed mold) or the intermediate mold. When the intermediate mold is used, Need only be such that the runners provided on the mold and the intermediate mold communicate with each other when the mold is clamped. Further, the intermediate type gate (gate) may be opened on the side surface of the cavity, so that the injection molding can be performed without being disturbed by the decorative sheet that covers both side openings of the cavity. In addition, the nozzle of the injection molding machine is not connected to the fixed mold and the movable mold, the runner and the gate are not provided at all, the runner and the gate are provided only in the intermediate mold, and the nozzle of the injection molding machine is directly connected to the intermediate mold. May be connected to.

Vacuum suction of the decorative sheet to the mold side in the molding method of the present invention is a preferred embodiment, whereby the decorative sheet is slackened, wrinkled, curled, and
It can be arranged without causing lifting or the like. This is particularly effective, for example, when the molding surface of the mold is concave or convex. As a preferred embodiment of the intermediate mold used in the preferred embodiment of the molding method of the present invention,
The runner / gate forming portion has a slide core structure so that the outer portion and the inner portion of the runner / gate forming portion can be divided as necessary after injection molding.
Also, the thickness of the cavity is changed only in one of the vertical direction and the horizontal direction, and the thickness is gradually reduced from the outer peripheral side to the cavity, and the thickness of the cavity is made thinner than both side portions thereof. Can be mentioned.

In the injection molding of the present invention,
A method of injecting and filling a resin in a fluid state and solidifying the resin includes a mode of cooling and solidifying a heat-melted thermoplastic resin and a mode of crosslinking and polymerizing a liquid resin at room temperature by a chemical reaction or heating to solidify. Both of them are included, and conventionally well-known injection molding apparatuses suitable for each of them can be appropriately used.

As the resin for injection molding, a thermoplastic resin such as AS (acrylonitrile-styrene copolymer), ABS (acrylonitrile-butadiene-styrene copolymer), polystyrene, polycarbonate, acrylic resin, or a chemical reaction or A conventionally known material for simultaneous injection molding decoration, which comprises an uncured liquid resin composition such as a two-component curable polyurethane, an unsaturated polyester, or an epoxy, which can be crosslinked or polymerized by heating, can be used.

In the molding method of the present invention, the two (first and second) decorative sheets wound on the same cylindrical tube while being overlapped with each other are, at the time of molding, the first and second decorative sheets of the injection molding machine. Are arranged to face each other in the cavity between the dies at a predetermined distance (the decorative sheet and the cavity may be arranged vertically or horizontally).
Therefore, in particular, when the intermediate die is arranged between a pair of dies for molding, the first and second decorations are provided from the position where the intermediate die is pulled out to the predetermined position in the cavity of the intermediate die. The distance traveled by the seat will usually be different. As a result, when the decorative patterns of the first decorative sheet and the second decorative sheet that are properly overlapped while being rolled up in the tube are unacceptable when they reach a predetermined molding position in the cavity. There is a high probability of being accompanied by.

In order to solve the above-mentioned inconvenience, for example,
For example, "+" shape, "-" in the margins of both ears of both decorative sheets
A positioning mark such as a letter shape or "I" shape is provided, and this is detected by a photoelectric sensor, an image sensor, etc. provided on the molding machine side, and based on this detection signal, a direction orthogonal to the feeding direction of the decorative sheet By appropriately controlling the traveling distance correcting means arranged in the above, the traveling distance in the sheet feeding direction between the first decorative sheet and the second decorative sheet is increased or decreased, and the sensor marks of both decorative sheets are simultaneously detected by the sensor. Is a preferred solution.

As the double-sided decorative molded article manufactured by the method for manufacturing a double-sided decorative molded article of the present invention, a plastic card (decorating patterns such as patterns, numbers, characters, magnetic stripes on both sides), LCD ( An edge light type surface light source (a rectangular parallelepiped or wedge-shaped transparent resin molded product) used as a back light source of a liquid crystal display device is used as a light guide plate. , Decorating a triangular prism linear array pattern made of a light transmissive diffusion layer or a transparent resin),
An example is an instrument panel (a transparent resin panel molded article is provided with instrument panel patterns such as scales, numbers, and letters on the front and back surfaces thereof).

[0022]

[Operation] As described above, in the decorative sheet according to the present invention, the first strip-shaped decorative sheet having the surface pattern of the decorative molded product and the second strip-shaped decorative sheet having the back surface pattern are preferably separated from each other as conventionally known. The mold sheets are sandwiched and the decorative patterns are aligned with each other, and are wound on the same tubular tube while being overlapped with each other. This decorative sheet is mounted on one delivery reel mounted on one mold (preferably fixed mold) side of the molding machine.

At the time of molding, the overlapping decorative sheets are pulled out from the delivery reel and passed through a guide such as a pair of guide rollers to be separated into the first and second decorative sheets, and the separated first and second decorative sheets. Of the decorative sheet is placed in the cavity space between the first and second molds of the injection molding machine so as to be opposed to each other with a distance therebetween, and is further passed through a guide such as a guide roller to again provide the first and second molds. After stacking the above decorative sheets, the roller is wound around the decorative sheet winding roller. When using a decorative sheet sandwiching a release sheet in the middle, the release sheet is placed in the mold cavity space by an appropriate means such as disposing a take-up roll for the release sheet at a position upstream of the mold. Do not enter. Further, in the case of a method of sandwiching and molding the intermediate mold between the first and second molds, the first decorative sheet is sandwiched between the first mold and the intermediate mold and the second mold is used.
The decorative sheet is assembled so that it is sandwiched between the second mold and the intermediate mold.

The mold is clamped in that state, and thereafter, a resin in a fluid state is injected and filled between the two decorative sheets in the cavity space between the two molds to solidify the resin. Thereby,
The first and second decorative sheets are integrated on both sides of a solidified resin molded product. The first and second molds are opened, and the resin molded product whose front and back surfaces are decorated with the first and second decorative sheets is taken out from between the molds (in some cases, an intermediate mold), and then decorated. When the sheet is a transfer sheet, a desired double-sided decorative molded article can be obtained by peeling off the base material sheet.

[0025]

Embodiments of the present invention will be described in detail below with reference to the drawings. FIG. 1 is a perspective view showing an embodiment of a decorative sheet 5 according to the present invention, in which two strip-shaped decorative sheets 5A and 5B having appropriate decorations (printed pattern, uneven pattern, etc.) 5C are stacked and cored. Tube 6 as a material (usually a paper tube)
Is involved in. As an example, by a gravure printing method on a 26 μm thick biaxially stretched polyester sheet,
Transfer sheet 5 made by printing different stone patterns
It may be one in which A and 5B are wound into a cylindrical tube having an inner diameter of 3 inches by a biaxial rewinding machine.

2 and 3 are schematic views showing an embodiment in which an intermediate die is used, which is a preferred embodiment of a molding apparatus used in the method for producing a double-sided decorative molded article according to the present invention. The apparatus 1 of the illustrated example is a fixed mold 1 detachably attached to a fixed platen 11 to which a nozzle 51 of an injection molding machine (not shown) is connected.
0, a movable die 20 attached to a movable platen 21 that can be moved up and down by a fluid pressure cylinder (not shown), and a shape of a molded product that can be detached from and obtained between the fixed die 10 and the movable die 20. The intermediate mold 30 having a thin rectangular parallelepiped double-sided opening cavity 35 corresponding to is arranged.

A runner (runner) 14 for guiding the molten resin injected from the nozzle 51 to the intermediate die 30 is formed in the fixed plate 11 and the fixed die 10 so as to penetrate through the thickness direction. 14 is provided with an appropriate draft, and an O-ring 16 is attached to the outer circumference of the lowermost end opening. The lowermost surface of the fixed mold 10 is a flat molding surface 12, and an intake path (hole) 17 communicating with an external vacuum pump is formed inside the flat molding surface 12. A protrusion pin 19 is inserted in the intake passage 17 so as to be vertically slidable.

Further, the fixed plate 11 or the fixed mold 10 is provided with four guide pins 23 vertically downward.
The guide pins 23 serve as guide means for preventing horizontal displacement of the intermediate die 30 and the movable die 20 when the intermediate die 30 and the movable die 20 are moved up and down, and the four corners of the movable die 20, the intermediate die 30 and the fixed die 10. Has been inserted into. The uppermost surface of the movable die 20 is a flat molding surface 22, and an intake passage (hole) 17 communicated with an external vacuum pump is formed in the inside thereof, like the fixed die 10. A protruding pin 19 is slidably inserted in the path 17 in the vertical direction.

As can be seen from FIG. 4 as well, the intermediate die 30 is a rectangular plate-like body having a cavity 35 in the central portion and having the same thickness, and the upper and lower surfaces thereof are the fixed die 10. And the flat molding surfaces 31 and 32 that are in contact with the molding surfaces 12 and 22 of the movable die 20, and inside thereof, a runner 24 that is connected to the runner 14 provided inside the fixed die 10 is provided. The gate 33 located at the tip of the runner 34 is opened on the side surface of the cavity 35.

Further, in this example, the runner of the intermediate die 30
The gate forming portion 36 has a slide core structure, and as will be understood by referring to FIGS. 5 and 6 described later, the outer portion 36A of the runner / gate forming portion 36 has the runner 34 portion as a boundary after injection molding. It is designed so that it can be separated outward and divided. Then, between the intermediate mold 30 and the fixed mold 10 and the movable mold 20, there are a strip-shaped first decorative sheet 5A and a second decorative sheet 5B having a width capable of completely covering the cavity 35, respectively. It is arranged with the surface to be bonded facing the intermediate mold side. Here, the first and second decorative sheets 5A and 5B are both transfer sheets in which a transfer layer is formed on the base material sheet, and at the time of molding, with the transfer layer side facing the intermediate mold 30 side. The base material sheet is arranged to be peeled off from the injection-molded article after the injection molding so that the transfer layer is left.

In the present invention, as shown in FIG. 1, the first and second decorative sheets 5A and 5B are roll-shaped decorative sheets 5 which are overlapped and rolled up with their transfer layer sides facing each other. It is mounted on a support shaft Ca attached to the fixed mold 11 side of the device 1. The overlapping decorative sheet 5 pulled out from the roll is first guided by the pair of parallel guide rollers Ra, Ra separated from each other.
Separated into a decorative sheet 5A and a second decorative sheet 5B,
Next, after passing through the travel distance correcting means 100, 100 described later, the pair of first feed rollers 46a, 46a is passed, the intermediate die 30 is passed with the cavity 35 sandwiched, and further, a pair of Second feed roller 4
After passing 6b and 46b, the first and second decorative sheets 5A and 5B are again overlapped with each other by using the guide rollers Rb and Rb as guides and mounted on the support shaft Cb attached to the fixed mold 11 side of the apparatus 1 again. It is wound up on a reel for collecting.

At the time of actual molding, the first decorative sheet 5A
And the second decorative sheet 5B is required by the pair of second feed rollers 46b, 46b (for one shot).
The cavities 35 are pulled out one by one, and are further opposed to each other with the cavity 35 sandwiched therebetween in a state where some tension is applied by the action of the first and second feed rollers 46a and 46b.
As can be seen from FIG. 3, the first decorative sheet 5A and the second decorative sheet 5B pulled out from the roll through such a route have different routes to reach the intermediate mold 30, so that some kind of travel distance correction is performed. If the means is not interposed in the running path, the traveling distance will be different, and accurate picture alignment between the first decorative sheet 5A and the second decorative sheet 5B in the space portion 35 will not be possible.

The traveling distance correcting means 100 is provided for this purpose, and the adjusting roller 101 arranged so that the center line thereof is oriented in the direction orthogonal to the feeding direction of the decorative sheet is not shown but an appropriate moving means. By the (servo motor, air cylinder, etc.), the first decorative sheet 5A and the second decorative sheet 5B are moved relative to each other by a predetermined distance in a direction intersecting with the transport direction of the decorative sheet (direction of arrow B in FIG. 3). Increase or decrease the distance in the sheet feed direction between
When both decorative sheets reach the first feed rollers 46a, 46a from the decorative sheet roll 5, the positional deviation of the decorative layers of both decorative sheets in the sheet traveling direction is corrected to be ± 0. .

For the purpose of effectively adjusting the traveling distance, for example, a "+" shape or a "-" shape is provided in the marginal area of both ears of both decorative sheets.
A first photoelectric sensor 4 provided with a positioning mark (not shown) having a letter shape, an "I" shape, etc., provided on the molding machine side.
1a, 42a, and based on this detection signal, the adjusting roller 101 of the above-mentioned running distance correcting means 100 is moved forward or backward by a required distance, and a sheet between the first decorative sheet 5A and the second decorative sheet 5B By increasing or decreasing the difference in position in the feeding direction, the sensor marks on both decorative sheets are detected by both sensors at the same time.

As described above, the first decorative sheet 5A and the second decorative sheet 5B whose positions are controlled so that the decorative patterns are aligned as described above are the first and second feed rollers 46a and 46b. By the action of the above, one shot is sequentially sent and the two are arranged opposite to each other with the cavity 35 sandwiched therebetween. At that time, the positioning mark formed on the decorative sheet is arranged on the downstream side of the second photoelectric sensor 41b. Four
2b, the decorative patterns of the decorative sheets 5A and 5B and the molded product are positioned.

In this state, the movable die 20 and the intermediate die 30 are raised to the fixed die 10 side to sandwich the first decorative sheet 5A between the molding surface 12 of the fixed die 10 and the molding surface 31 of the intermediate die 30. At the same time, the second decorative sheet 5B is clamped between the molding surface 22 of the movable mold 20 and the molding surface 32 of the intermediate mold 30 (FIG. 5). At this time, the first and second decorative sheets 5A and 5B are attached to the movable die 20 and the intermediate die 30.
May be raised together with. Further, before and after the mold clamping, the air between the fixed mold 10 and the first decorative sheet 5A and the air between the movable mold 20 and the second decorative sheet 5B are vacuum-sucked through the intake passages 17, 17. And remove.

Subsequently, the molten resin P is injected and filled from the nozzle 50 of the injection molding machine through the runners 14, 34 and the gate 33 into the cavity 35 to perform injection molding. 2 decorative sheets 5
A and 5B are bonded and integrated.

After the injection molding is completed in this way, the intermediate mold 30 and the movable mold 20 are lowered as shown in FIG.
The intermediate die 30 is separated from the fixed die 10 and the movable die 20 is detached from the intermediate die 30, so that the obtained double-sided decorative molded product P ′ is inserted into the intake passage 17
At the same time, the outer part 36A of the runner / gate forming part 36 of the intermediate mold 30 is divided outwardly with the runner 34 part as a boundary and divided, and at the same time, fixed plate 11 and fixed mold 10
Are also separated as necessary, and the runner 34 of the intermediate die 30, the cured resin Pb of the gate 33 portion, the fixed plate 11, the fixed die 10
The cured resin Pa on the runner 14 is removed. By doing so, demolding can be performed easily and quickly.

In the molding apparatus for the double-sided decorative molded article of this embodiment having the above-mentioned structure, the intermediate mold 30 is formed before injection molding.
The cavity 35 of the first and second decorative sheets 5A, 5
Completely covered with B, and the first and second decorative sheets 5
A part outside the part covering the cavity 35 in A and 5B, that is, the outer peripheral part is sandwiched between the fixed mold 10 and the intermediate mold 30 and between the movable mold 20 and the intermediate mold 30 to be restrained and held. Therefore, some tension is applied to the decorative sheet before injection molding, such as when clamping the mold,
Alternatively, the decorative sheets 5A and 5B are attached to the fixed mold 10 or the movable mold 2.
It is possible to perform vacuum suction to the 0 side.

Therefore, it becomes possible to appropriately stretch the first and second decorative sheets 5A and 5B before molding.
As a result, slack, wrinkles, curls, rises, etc. are corrected, and since the decorative sheets 5A, 5B are sandwiched during injection molding, undesired behavior does not occur and wrinkles, distortions, misalignments, etc. do not occur. Occurrence is prevented. Further, since the outer peripheral portions of the first and second decorative sheets 5A and 5B are sandwiched between the fixed mold 10, the movable mold 20, and the intermediate mold 30, respectively, the molten resin P is used as the decorative sheets 5A and 5B during injection molding.
It is also prevented from wrapping around from the edge to the back side.

The molding surfaces of the fixed mold 10, the movable mold 20, and the intermediate mold 30 (thus, the outer shape of the molded product to be obtained) may be flat surfaces as described above, or may be convex or concave surfaces. Good.

7 to 9 show the molding surface 3 of the intermediate mold 30 '.
1'and 32 'are concave shapes, and a fixed mold 10' and a movable mold 2
The molding surfaces 12 'and 22' of 0'are each shown as a convex surface. The other parts have substantially the same structure as that described above, and the differences will be mainly described below. In the device 1'of this example, the thickness of the intermediate mold 30 'is changed only in one lateral direction, and the thickness of the intermediate mold 30' is gradually reduced from the outer peripheral side to the cavity 35 '. Has a trapezoidal cross section in which the upper and lower molding surfaces 31 'and 32' are recessed inward. In addition, the fixed mold 10 'and the movable mold 20'
The molding surfaces 12 ', 22' of the intermediate mold 30 are
It has a trapezoidal cross section that projects outward to fit into 1'and 32 '. By doing so, it is possible to make the thickness of the cavity 35 'extremely thin, and it is possible to properly decorate both sides of a thin object such as a card without wrinkles or displacement.

Although not shown in particular, in the apparatus according to this example as well, in the same manner as shown in FIG. 3, the decorative sheet according to the present invention in which the first and second strip-shaped decorative sheets 5B are overlapped with each other and wound around a tubular tube. It will be readily appreciated that 5 may be used.

FIG. 10 is a schematic cross-sectional view for explaining another molding apparatus for carrying out the method for molding a decorative molded article according to the present invention. In the case of this molding apparatus, the above-mentioned intermediate mold is used. Without, a double-sided decorative molded product can be obtained. That is, this molding apparatus 1A is provided with a pair of molds 10.
A and 20A are arranged to face each other so that the mold can be opened and clamped by an appropriate means, and a mold cavity 35 can be formed therein.
A is formed. Both molds 10A,
20A is slightly inward from the surface (parting surface) that will come into contact during molding (upper or lower in FIG. 10).
The decorative sheets 5A and 5B at a position closer to the mold 10
Slit-shaped through holes Sa, Sa 'and Sb, Sb' for introducing and leading into A and 20A are provided, and an intake passage 17A for depressurizing the inside of the cavity 35A.
Are formed. Incidentally, such a molding die itself is already known.

When injection molding is performed using this apparatus using the decorative sheet according to the present invention, as shown in FIG. 10, first and second decorative sheets 5A from the roll-shaped decorative sheet 5 are formed. 5B is placed in the cavity 35A through the through holes Sa, Sa 'and Sb, Sb', and the mold is clamped in that state, and then the resin in a fluid state may be injected and filled. By inhaling air from the intake passage 17A, the decorative sheets 5A and 5B come into close contact with the inner surfaces of the cavities of the molds 10A and 20A to ensure the filling of the resin.

As shown in FIG. 10, also in the molding method using this molding die apparatus, as in the case shown in FIG. 3, the traveling distance correcting means 100, the photoelectric sensor 41a,
It will be readily understood that the alignment means etc. by 42a and 41b, 42b could equally be used.

Further, also in the molding apparatus shown in FIG. 12 as a conventional example, the decorative sheet 5 according to the present invention is attached to the machine frames 8s and 28s of the dies 1s and 21s, respectively, and pulling rolls (cylindrical tubes) 9s, After being attached to only one of the 29s and pulled out from the roll, one (first) strip-shaped decorative sheet 5A is attached to the frame-shaped holding plate 4s,
It is also easy to carry out injection molding in the same manner as in the past by sandwiching the sheet in one of the 24s and sandwiching the other (second) strip-shaped decorative sheet 5B in the other sandwiching plate 4s, 24s. Be understood.

As is apparent from the above description, the decorative sheet 5 according to the present invention is the first and second decorative sheets 5A,
Since 5B is in a roll shape that is overlapped and rolled up, it is easy to handle and can be mounted on a molding machine without separately performing the front surface side and the back surface side decorative sheet separately. Since the work is completed in a single operation, not only the mounting work is facilitated, but also mistakes such as mistaken combination of the front side, the back side and the decorative sheet due to the carelessness of the operator can be avoided. In addition, a device for pulling out and winding up the decorative sheet is only required to be one set, and there is an advantage that the space around the molding machine can be effectively utilized.

FIG. 11 shows an example of an edge light guide plate for a rear light source of a liquid crystal panel having a triangular prism linear array layer on one side and a dot print on one side, obtained by the manufacturing method according to the present invention. As the first decorative sheet 5A, a release sheet made of a silicone acrylate resin cross-linked layer is laminated on a biaxially stretched PET sheet, and a support sheet having an uneven pattern of a triangular prism linear array formed on the surface thereof,
As the transfer layer 200, an acrylic resin layer laminated on the release layer, a light diffusion / transmission layer made of a polyurethane resin in which polystyrene resin beads are dispersed, a magnesium fluoride vapor deposition layer, and an acrylic resin layer as an adhesive layer. And a support sheet in which a release layer made of a silicone acrylate resin cross-linking layer is formed on a biaxially stretched PET sheet as the second decorative sheet 5B, and the release layer as the transfer layer 201. A light diffusion dod 202 having a circular pattern with a diameter of 3 mm is printed on the top with ink of an acrylic resin binder in which TiO ₂ powder is dispersed, and further an acrylic resin layer is installed as an adhesive layer, and the transfer layers face each other. Then, the decorative sheets which are stacked and rolled into a roll are set in the injection molding machine shown in FIG. 3, and the first decorative sheet is formed as described above. 5A and the second decorative sheet 5B so that both transfer layers face the cavity 35 side of the intermediate mold 30 and are passed through the molds 10 and 20 and clamped to form an intermediate portion between the decorative sheets. It is formed by injection-filling a hot-melt acrylic resin 210 into the mold cavity 35 and solidifying it.

Both decorative sheets 5 are formed by cooling and solidifying the filled resin.
A and 5B were integrated, and after the mold was opened, the support sheet was peeled off to obtain the acrylic resin light guide plate 300 in which the transfer layers 200 and 201 were decorated on both front and back surfaces.

[0051]

EFFECTS OF THE INVENTION According to the decorative sheet and the method for molding a decorative molded article using the decorative sheet according to the present invention, a decorative sheet to be used on both sides when performing decoration on both sides of the molded article simultaneously with injection molding. The combination will not be inadvertently mistaken, the handling of the decorative sheet will be easy, and the surrounding space can be effectively used. Further, it is possible to reduce the occurrence of wrinkles, distortions, positional deviations, and the like for decoration, and further, it is possible to reduce the device cost with a simple configuration as much as possible.

[0052]

[Brief description of drawings]

FIG. 1 is a perspective view showing an outline of a decorative sheet according to the present invention.

FIG. 2 is a schematic vertical cross-sectional view showing an embodiment of a molding apparatus suitably used for carrying out the method for producing a double-sided decorative molded product according to the present invention.

FIG. 3 is a schematic side view of the apparatus shown in FIG.

FIG. 4 is a perspective view showing an intermediate mold of the apparatus shown in FIG.

5 is a partial cross-sectional view showing one step of a method for manufacturing a double-sided decorative molded product according to the present invention using the apparatus shown in FIG.

6 is a partial cross-sectional view showing another step of the method for producing a double-sided decorative molded product according to the present invention using the apparatus shown in FIG.

FIG. 7 is a schematic vertical cross-sectional view showing another embodiment of a molding apparatus suitably used for carrying out the method for producing a double-sided decorative molded product according to the present invention.

FIG. 8 is a perspective view showing an intermediate mold of the apparatus shown in FIG.

9 is a partial cross-sectional view showing one step of a method for producing a double-sided decorative molded product according to the present invention using the apparatus shown in FIG.

FIG. 10 is a schematic vertical sectional view showing still another embodiment of a molding apparatus suitably used for carrying out the method for producing a double-sided decorative molded article according to the present invention.

FIG. 11 is a perspective view showing an example of a double-sided decorative molded product manufactured by the manufacturing method according to the present invention.

FIG. 12 is a diagram showing an example of manufacturing a conventional double-sided decorative molded product.

[Explanation of symbols]

1 ... Molding device for double-sided decorative molded product, 5 ... Decorative sheet, 5
A, 5B ... First and second strip-shaped decorative sheets, 5C ... Decoration, 10 ... Fixed mold, 11 ... Fixed plate, 12 ... Molding surface, 14
… Runners, 17… intake passages, 19… ejection pins, 20
... Movable mold, 21 ... Movable plate, 22 ... Molding surface, 30 ... Intermediate mold, 31, 32 ... Molding surface, 33 ... Gate, 34 ... Runner, 35 ... Cavity, 46a, 46b ... Feed roller, 100 ... Travel distance correction means

─────────────────────────────────────────────────── ─── Continuation of front page (56) Reference JP-A-64-64846 (JP, A) JP-A-2-38028 (JP, A) JP-A-6-99458 (JP, A) JP-A-1- 110924 (JP, A) JP 4-208423 (JP, A) JP 61-272118 (JP, A) JP 63-132499 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) B29C 45 / 14,45 / 16 B29C 45 / 26,33 / 12

Claims (2)

(57) [Claims] 1. An injection molding machine for pulling out the first and second strip-shaped decorative sheets from a decorative sheet in which the same or different first and second strip-shaped decorative sheets are overlapped and wound on the same cylindrical tube. In the cavity space between the first and second molds, the two molds are clamped by sandwiching both the decorative sheets, and then facing each other in the cavity space between the molds. A resin in a fluid state is injected and filled between the two strip-shaped decorative sheets, and the resin is solidified, and then the first and second molds are opened, and the front and back surfaces have the first and second strip-shaped decorations. A method for molding a decorative molded product, characterized in that a resin molded product decorated with a sheet is taken out from between both molds. 2. An intermediate mold is provided between the first mold and the second mold, the intermediate mold having a double-sided opening cavity which is separable from the first mold and has a shape corresponding to a shape of a molded product to be obtained, and the intermediate mold. The first and second strip-shaped decorative sheets are respectively disposed between the first and second molds and the first strip-shaped decorative sheet and the first strip and the intermediate mold. Clamping is performed such that the second strip-shaped decorative sheet is sandwiched between the second mold and the intermediate mold, and then the cavity is injection-filled with a resin in a fluidized state to solidify the resin. after allowed to claim 1, the first and second molds and mold opening, the front and rear surfaces, characterized in that the taking out the resin molded article decorated by the first and second strip-shaped decorative sheet from the intermediate mold A method for forming a decorative molded product as described in the above.