JPH08118408A - Manufacture of pattened injection molded product and its apparatus - Google Patents

Abstract

PURPOSE: To obtain a synthetic resin molded product of an excellent quality by eliminating collapse of a pattern and a difference in ink concentration by a method wherein after a decorating sheet is heated and slackened by applying a pneumatic pressure, a negative pressure is supplied to fix the decorating sheet by suction onto a surface of one side molding tool. CONSTITUTION: A thermally deformable patterned decorating sheet S provided between a pair of molding tools 3, 4 is fixed by suction onto a surface 3a of one side molding tool having a flat part A and a recessed part B. Then, a molten synthetic resin is injected into a cavity from the other side molding tool. A formed resin molded product is patterned by the decorating sheet S. Herein, the decorating sheet S is clamped with the surface 3a of one side molding tool 3, and heated. Further, a negative or positive pneumatic pressure is applied to the decorating sheet in the molding tool face and slackened. Thereafter, a negative pressure is applied to fix by sucking the decorating sheet S onto the surface 3a of one side molding tool 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for producing a patterned injection-molded article in which the surface of the injection-molded article is patterned by a decorating sheet when the injection-molded article is molded.

[0002]

2. Description of the Related Art Conventionally, a method of decorating a surface of an injection-molded product with a picture, a pattern, characters, etc. (hereinafter, referred to as a pattern) has been widely used (for example, JP-A-4-298,
311 and JP-A-6-155,525).

According to this method, a decorative sheet having a printing layer provided on a film made of a synthetic resin which is easy to form is arranged between molds for injection molding, and a pattern is formed on the surface at the same time when the synthetic resin is injection-molded. It is attached. In this decorative sheet, a pattern is printed on a synthetic resin film that is integrated with the resin molded product at the same time as injection molding, and a release layer, a pattern printing layer, and an adhesive layer are laminated on the synthetic resin film. Then
There is a so-called transfer film in which a film is peeled off after molding.

No matter which film is used, if the shape of the molded product is complicated or if deep drawing is required, the decorative sheet must be preformed in advance.

Therefore, the applicant of the present application tried a method of heating the transfer film and then performing injection molding to form a resin molded product and simultaneously transfer a pattern onto the surface of the resin molded product. That is, in FIG. 8, the sheet feeding device 1 and the winding device 2 are operated to feed the decorating sheet S between the molding dies 3 and 4, and the molding surface of one molding die 3 of the decorating sheet S. The periphery of the portion corresponding to 3a is clamped by the clamp member 5. Next, after the heating device 6 is installed between the molding dies 3 and 4 so as to face the decorating sheet S, the heating device 6 is operated to heat the decorating sheet S. The decorative sheet S that has been softened to some extent by this heating and has improved moldability is vacuum-adsorbed so as to be fixed to the mold surface 3a of the mold 3. This vacuum suction is performed by discharging the air between the decorating sheet S and the mold surface 3a of the molding die 3 to the outside through the suction passages 7 and 8. Then, after the heating device 6 is retracted from between the molding dies, the molding dies 3 and 4 are combined, injection molding of synthetic resin is performed, and at the same time, the pattern is transferred to the surface of the injection molded product by the decorating sheet S.

[0006]

However, some molded products have an opening O, such as a finisher for indicating the shift lever position of an AT vehicle (see FIG. 9). As shown in FIG. 10, the molding die 3 for forming such a molded product W has a flat portion A for forming the opening O and an annular portion for forming the peripheral portion P of the opening O. The recess B is required.

In manufacturing a patterned injection-molded article using such a mold 3, when the decorative sheet S heated by the heating device 6 is fixed to the mold surface 3a, the decorative sheet S is flat. The decorative sheet S is contacted with A and the heat of the decorative sheet S is taken by the forming die 3 to be cooled rapidly, but the decorative sheet S in the portion corresponding to the recess B does not come into contact with the forming die 3. , Not cooled.

Since the decorative sheet S is mainly composed of a synthetic resin film, when it is cooled, it loses its elongation and its formability deteriorates. As a result, when the vacuum suction is performed, the decorating sheet S that is in contact with the flat portion A does not stretch, the portion corresponding to the recess B locally stretches, the pattern collapses, and the ink becomes thin, When the molded product W is obtained, the product quality of the peripheral portion P may be deteriorated. In particular,
When the recess B is deep and deep drawing is performed, such a tendency becomes remarkable.

According to an experiment in which the elongation rate in the vicinity of the recess B of the decorative sheet S is examined, as shown by the broken line a in FIG.
The portion corresponding to the side wall of the concave portion B exhibits a large elongation rate x, and the portion corresponding to the bottom surface of the concave portion B has a relatively small elongation rate y, so that the portion corresponding to the side wall of the concave portion B has color unevenness and disorder of pattern. I found out.

The present invention has been made in view of such a conventional technique, and a surface of a synthetic resin molded product is treated by using a mold having a flat portion and a concave portion and a heat-deformable decorating sheet. An object of the present invention is to provide a method and an apparatus for producing a patterned injection-molded product, which is capable of obtaining a synthetic resin molded product of excellent quality, which is free from the collapse of the pattern and the difference in the ink density even when decorating.

[0011]

According to the method of the present invention for achieving the above object, a heat-deformable patterned decorative sheet provided between a pair of molding dies is flattened. Adsorbed and fixed on the mold surface of one of the molds having a part and a recess,
In the method for producing a patterned injection-molded product, the synthetic resin melted from the other mold is injected into the cavity, and the molded resin molded product is patterned by the decorating sheet. Is clamped to the mold surface of one of the molding dies, and the decorative sheet is heated, and further loosened by applying negative or positive air pressure to the decorative sheet in the mold surface, It is characterized in that the negative pressure is supplied so as to be sucked and fixed to the mold surface of one of the molds.

According to the second aspect of the present invention, the slackening of the decorating sheet is performed before the decorating sheet that is sucked under negative pressure comes into contact with the molding die. It is characterized in that a part of the mold is adsorbed and drawn into a concave portion formed on the mold surface of the mold.

According to the third aspect of the present invention, the slackening of the decorating sheet is performed by clamping the periphery of the decorating sheet to the one die around the die surface, and the die surface of the die. It is characterized in that positive pressure air is blown from the side and the entire decorative sheet is expanded so as to be uniformly extended.

According to a fourth aspect of the present invention for achieving the above object, there is provided an apparatus for producing an injection molded article with a transfer pattern,
A pair of molds provided so that the mold surfaces face each other, a decorative sheet with a pattern provided between the molds, and one mold having the flat portion and the concave portion of the decorative sheet. And a suction means for adsorbing and fixing to the mold surface by negative pressure, and injecting the molten synthetic resin from the other mold into the cavity, and patterning the molded resin molded product with the decorating sheet. And a clamping member for clamping the decorative sheet around the mold surface of one of the molding dies, and the molding die for heating the clamped decorative sheet. And a slackening means for applying positive or negative air pressure so as to cause slack in the heated decorating sheet.

According to the fifth aspect of the present invention, the slackening means is a sheet adsorbing member made of a porous material that is provided so as to be retractable from the bottom surface of the recess formed in the mold surface of the molding die. This sheet suction member, before the decorative sheet is sucked and fixed to the mold surface of one of the molds by the suction means, suck a part of the decorative sheet, in the recess It is characterized in that it is controlled to retract.

According to the sixth aspect of the present invention, in the mold surface of the one mold having the recess and the flat portion, at least the surface of the flat portion is made of a material having a small frictional resistance. And

According to the present invention of claim 7, the mold surface of the one molding die has the concave portion and the flat portion, and at least the flat portion is heated by the heat of the decorative sheet. It is characterized by having a heat insulating structure that does not reach the forming die.

[0018]

According to the method of the present invention as set forth in claim 1, after heating the heat-deformable decorative sheet supplied between the pair of molding dies, the decorative sheet is forcibly loosened, and the flat portion and the concave portion are formed. Since the decorative sheet is adsorbed and fixed on the surface of the molding die, the decorative sheet does not have local pattern collapse and ink density difference, and a synthetic resin molded article having excellent quality can be obtained.

According to the second aspect of the present invention, before the decorating sheet comes into contact with the molding die, the decorating sheet is partially adsorbed, and this portion is inserted into the concave portion of the mold surface. When the above is induced, the heat can be smoothly obtained without removing the heat of the heated decoration sheet, and a patterned injection-molded article with excellent quality can be obtained.

According to the third aspect of the present invention, when the decorating sheet is expanded by positive pressure air, the decorating sheet is stretched over the entire surface, and even when deep drawing is performed. In addition, the margin of the decorative sheet is large and local stretching does not occur, which also makes it possible to obtain a patterned injection-molded article with excellent quality.

According to the apparatus of the present invention as defined in claim 4, the decorative sheet with a pattern provided between a pair of molding dies provided so that the mold surfaces are opposed to each other is provided with one of the molding dies. Since it is heated by the heating means in a state of being clamped on the mold surface of the decorative sheet, the slackening means for pressing the decorative sheet using positive or negative air pressure causes slack in the decorative sheet, With a simple structure, it is possible to obtain a patterned injection-molded product with excellent quality.

According to the fifth aspect of the present invention, the slackening means is composed of a sheet adsorbing member made of a porous material protruding and retracting from the bottom surface of the recess formed in the mold surface of the molding die. , Before the decorative sheet is adsorbed and fixed to the mold surface of one of the molds by the adsorbing means, the sheet adsorbing member can adsorb the decorative sheet under negative pressure and guide it to be drawn into the recess, As a result, it can be loosened before it comes into contact with the mold and heat is removed, the pattern is not locally deformed, the ink layer does not become thin, and unnecessary force is applied to the decorative sheet. Without, the decoration sheet can be loosened.

According to the sixth aspect of the present invention, since at least the flat portion of the mold surface of the molding die having the concave portion and the flat portion is made of a material having a small frictional resistance, it is used for decoration. It is easy to move on the mold surface of the sheet, and the decorative sheet can be easily loosened.

According to the seventh aspect of the present invention, since the mold surface of the molding die has a heat insulating structure so that heat of the decorating sheet is not transferred, heat transfer of the decorating sheet does not occur. The formability of the decorative sheet does not deteriorate.

[0025]

An embodiment of the present invention will be described below with reference to the drawings. 1 is a cross-sectional explanatory view showing a manufacturing apparatus according to a first embodiment of the present invention, FIG. 2 is a cross-sectional view showing a main part of the apparatus, and FIGS. 3 and 4 show an operating state of a sheet suction member shown in FIG. Sectional views and FIGS. 5 to 7 are sectional explanatory views showing other embodiments of the present invention. The members common to the members shown in FIGS. 8 to 11 are designated by the same reference numerals.

The manufacturing apparatus of this embodiment forms a molded product W (see FIG. 9) having an opening O and a peripheral portion P, such as a finisher for displaying the shift lever position of an AT vehicle. The decorative sheet S for giving a pattern to the peripheral portion P of the molded product W is formed while being loosened so as not to be locally stretched.
The decorative sheet S used here is a transfer film in which a release layer, a pattern printing layer, and an adhesive layer are laminated on a synthetic resin film, and the film is released after molding, and the sheet feeding device 1 and the winding device. One mold 3 by operating 2
It is designed to be fed along the mold surface 3a.

As shown in FIG. 2, the molding die 3 has a clamp member 5 for lightly fixing the decorative sheet S to the die surface 3a.
And a suction device 10 for sucking the decorative sheet S on the mold surface,
A slackening means 20 for slackening the decorative sheet S is provided, and a flat portion A for forming the opening O and a peripheral portion P of the opening O are formed on the mold surface 3a of the molding die 3. The annular recesses B, B for forming are formed.

As the clamp member 5, various means such as spring means or robot means can be considered, but it is preferable that the clamp member 5 is composed of a movable pressing roller. If a pressing roller is used, the clamp member 5 itself rotates when the decorating sheet S is adsorbed, and the decorating sheet S can be held in a state where the decorating sheet S is easily drawn into the molding die. There is an advantage that you can. In addition,
The pressure applied by the pressing roller is such that the decorating sheet S is easily drawn into the molding die, and is preferably relatively weak.

In the suction device 10, the suction passages 11 and 12 which are bored so as to communicate with the recess B of the molding die 3 and the suction source 13 such as a compressor are connected by a pipe or the like. When held on the mold surface 3a by the clamp member 4, the air existing between the mold surface 3a and the decorating sheet S is quickly sucked, and the decorating sheet S is adsorbed and fixed along the mold surface 3a. It was done so. In addition, the tip of the suction passage 11 has a concave portion B, and the tip of the suction passage 12 has
It communicates with a later-described recessed hole portion 23.

The slackening means 20 of this embodiment is the mold 3
The sheet adsorbing member 21 made of a porous material is provided in the concave portion B. The sheet adsorbing member 21 is connected to the cylinder member 22 via a rod 22a, and by operating the cylinder member 22, the entire sheet adsorbing member 21 is recessed into a recessed hole portion 23 continuous with the recessed portion B. It moves between the retracted position and the protruding position where the tip of the sheet suction member 21 projects so as to be substantially flush with the opening end of the recess B. And this recessed hole portion 23
The tip of the sheet is sealed by a sealing material 24 such as an O-ring, and the vacuum pressure from the suction passage 12 is efficiently transmitted to the tip of the sheet suction member 21 through the recessed hole 23.

Therefore, the sheet suction member 21 is
At the protruding position in the state shown in FIG. 2, immediately before the decorating sheet S is adsorbed and fixed to the mold surface of one of the molding dies, the decorating sheet S is adsorbed under negative pressure, and after adsorbing, the cylinder member 22 is used. The decorative sheet S is activated and, as shown in FIG.
Is retracted so as to be drawn into the recess B, and the decorative sheet S is loosened. Further, when injection molding is performed, it is in the retracted position so as not to interfere with the injection molding.

As described above, the sheet adsorbing member 21 is brought into contact with the flat portion A when the adhering sheet S is adsorbed by the adsorbing device 10 and the adhering sheet S heated by the heating means 6 described later contacts the flat portion A. The heat is prevented from being taken away and the formability of the decorative sheet S is prevented from being deteriorated. As a result,
There is no local stretching of the part corresponding to the recess B,
There is also no risk of uneven color or disorder of the pattern. Also,
The sheet adsorbing member 21 is projected from the bottom surface Bb of the recess B, the decorating sheet S is temporarily adsorbed at the leading end, and retracts into the recess B. Therefore, the decorating sheet S is not stretched but is slackened in the recess B. As a result, the decorative sheet S can be surely loosened, and even from this point, local stretching of the portion corresponding to the recess B is eliminated,
There is no fear that the decorative sheet S will have local color unevenness or pattern disturbance.

Since the decorating sheet S is made of a synthetic resin material as described above, it is possible to improve the formability by softening it to some extent. Therefore, in this embodiment, the heating means 6 that can be moved up and down is provided between the molding dies 3 and 4. As shown in FIG. 1, the heating means 6 has a main body 32 connected to an upper movable bar 30 via an arm 31, and a heater 33 made of nichrome wire or the like is provided on a side surface of the main body 32. A protective cover 34 is attached to the front surface of the heater 33.

The heating means 6 is hung down so as to face the decorating sheet S after the decorating sheet S is fed by the sheet feeding device 1 along the mold surface 3a of the molding die 3. To the extent that the decorative sheet S can be softened, the heater 33
Are heated by the movable bar 30 during injection molding and controlled by control means (not shown) so as to stand by.

Next, the operation of this embodiment will be described. The sheet feeding device 1 and the winding device 2 are operated in a state where the molding dies 3 and 4 are relatively separated from each other to form the decorative sheet S having a pattern along the mold surface 3a of the molding die 3 into the molding die 3. , 4 and then the pressing roller of the clamp member 5 is operated to fix the peripheral portion of the decorating sheet S corresponding to the mold surface 3a of the one molding die 3.

Next, the movable bar 30 is operated and the heating means 6 is operated.
Is moved between the molding dies 3 and 4, and the heater 33 is energized to generate heat, and the heat causes the decoration sheet S to be heated and softened. Since the heat-softened decorative sheet S has improved moldability, the suction device 10 is immediately activated to suck air existing between the mold surface 3a of the molding die 3 and the decorative sheet S into the suction passage 11 The decorative sheet S is adsorbed to the mold surface 3a while being discharged to the outside through the mold.

In this case, the cylinder member 22 of the slackening means 20 is also actuated, and the sheet suction member 21 is projected from the concave portion B formed in the mold surface 3a of the molding die 3 to the extent that it is substantially flush with the mold surface 3a. It Therefore, the decorative sheet S
The tip of the sheet adsorbing member 21 adsorbs the decorating sheet S immediately before being adsorbed by the adsorbing device 10 and contacting the flat portion A of the mold surface 3a. Then, when the cylinder member 22 is actuated again and the sheet adsorbing member 21 retracts, the decorating sheet S is guided and drawn into the recess B along with this, and a preliminary slack is given (state of FIG. 3). . Further, when the sheet adsorbing member 21 is actuated and is retracted so that the front end thereof becomes substantially the same surface as the bottom surface Ba of the recess B, the entire sheet adsorbing member 21 is placed in the recessed hole portion 23 so as not to interfere with the injection molding. It will be located (state of FIG. 4).

As described above, the decorative sheet S is first loosened before it comes into contact with the flat portion A of the mold and is deprived of heat, so that the pattern is locally deformed or the ink is removed. The layers are prevented from thinning. Moreover, since the suction of the decorating sheet S is local, it is not necessary to unnecessarily increase the suction force of the decorating sheet S, and the loosening can be easily performed. Furthermore, the decorative sheet S is the adsorption device 1
When it is adsorbed by 0, it comes into the concave portion B smoothly due to the slack attached in advance, and there is no local stretching or pattern collapse, and the state is along the inner peripheral surface of the concave portion B. . Of course, the smooth forming of the decorative sheet S in this case also contributes to the fact that the formability is improved by the heating by the heating means 6 described above.

Then, after injecting the molten resin into the cavity and waiting for the resin to solidify, the molds 3 and 4 are released from the mold, so that the pattern is not broken and the ink density is not different. The resin molded product thus obtained is obtained, and when the film is taken out and the winding device 2 is operated to wind the film, the work is completed.

As a result of examining the elongation rate in the vicinity of the recess B in this example, the result shown by the solid line in FIG. 11 was obtained. As is clear from this result, the elongation rate of the decorative sheet is about a fraction of that of the prior art due to the partial slackening after heating, and it is possible to reliably prevent the pattern from collapsing. Is clear.

The slackening means 20 of the first embodiment described above.
Is configured to apply a negative pressure to the sheet adsorbing member 21 to adsorb the decorative sheet S, guide the sheet S into the recess B, and locally loosen the sheet. However, the present invention is not limited thereto. Instead, as in the second embodiment shown in FIG. 5, the periphery of the decorative sheet S is clamped to one molding die 3 and a positive pressure is applied from the molding surface 3a side of the molding die 3 by the compressed air supply device 40. Air may be blown out to swell the entire decorating sheet S, and the decorating sheet may be uniformly stretched and loosened throughout. The second embodiment also has the adsorbing device 10, but the negative pressure from the adsorbing device 10 and the positive pressure from the compressed air supply device 40 are applied to the switching valve 4.
1 is appropriately selected, and air is supplied to the space between the mold surface 3a and the decorating sheet S, or air present therein is discharged.

In this embodiment, since the decorating sheet is swelled by the air of positive pressure, the decorating sheet is stretched over the whole, and the margin of the decorating sheet is increased even when deep drawing is performed. The cost is large and local stretching does not occur, which also provides a patterned injection-molded product with excellent quality.

In the first and second embodiments, measures are taken to the decorative sheet S so as to obtain a patterned injection-molded article of excellent quality, and the decorative sheet S is loosened or expanded. However, the present invention may take measures not only on the decorative sheet S side but also on the molding die itself.

FIG. 6 shows a third embodiment of the present invention. In the third embodiment, the mold surfaces other than the concave portion B, that is, the surface portions 42 of the flat portions A and C are made of a fluororesin having a small frictional resistance, such as tetrafluoroethylene. Even if the decorating sheet S comes into contact with the surface and the heat generated is taken away to reduce the formability, the surface portion 42 exerts a sliding function, so that the decorating sheet S easily enters the recess B.

Further, in order to further promote the sliding effect of the surface portion 42, the heater 4 is provided on the back surface side of the surface portion 42.
3 may be provided to prevent deterioration of the formability of the decorative sheet S.

Further, FIG. 7 shows a fourth embodiment of the present invention. In the fourth embodiment, instead of the heater 43 in the third embodiment, the mold surface other than the concave portion B, preferably the flat portion A, is insulated so that the heat of the decorating sheet S is not transferred to the molding die 3. It is structured. Here, as shown in FIG. 7, the heat insulating structure is a heat insulating structure having a mold structure in which the flat portion A is made to recede from a normal mold surface so that the air layer 44 is present, and the flat portion A. The part includes a heat insulating material (not shown), such as phenol or epoxy resin. In addition,
In the case of heat insulation by the air layer 44, it is preferable to provide a seal / sliding member 45 made of a material having a small frictional resistance so as to surround the outer periphery of the flat portion A.

In the various embodiments described above, the suction is performed by vacuum, but the suction is not necessarily a vacuum and may be a negative pressure with a low air pressure. Further, in the above-mentioned embodiment, a transfer film is used as the decorating sheet S to perform the decorating by the transfer. However, the present invention is not limited to this, and the synthetic resin film described above has a pattern. It is also possible to use a decorative sheet which is printed and is integrated with the resin molded product at the same time as the injection molding.

[0048]

As described above, according to the method of the present invention as set forth in claim 1, since the decorating sheet is loosened between the molding dies and is heated, it is adsorbed and fixed to the mold surface of the molding die. Even when the surface of a synthetic resin molded product is decorated using a mold having a flat portion and a recess and a decorating sheet that can be thermally deformed, the pattern collapses and the difference in ink density does not occur.
A synthetic resin molded product with excellent quality can be obtained.

According to the second aspect of the present invention, before the decorating sheet comes into contact with the molding die, a part of the decorating sheet is sucked by negative pressure and enters the concave portion of the mold surface. Since the induction is performed in this manner, the heat of the heated decorating sheet is not removed, and the molding can be smoothly performed. This also provides a patterned injection-molded article with excellent quality.

According to the third aspect of the present invention, since the decorating sheet is swelled by the positive pressure air, not only the decorating sheet can be present more in the mold surface, but also the whole decorating sheet can be present. Can be stretched over a relatively large amount of slack, and even if deep drawing is performed, there is a large margin for the decorative sheet and local stretching does not occur. A patterned injection-molded article with excellent quality can be obtained.

According to the apparatus of the present invention as defined in claim 4, the decoration sheet is heated by the heating means in a clamped state and is loosened by the slackening means. An injection-molded article with a patterned pattern is obtained.

According to the fifth aspect of the present invention, if the slackening means is composed of a sheet adsorbing member made of a porous material protruding and retracting from the bottom surface of the concave portion formed on the mold surface of the molding die, Since it can be loosened before it contacts the mold and loses heat, the pattern is not locally deformed, the ink layer does not become thin, and moreover, the force for sucking the decorative sheet is not unnecessarily applied. The decorative sheet can be loosened.

According to the sixth aspect of the present invention, since the mold surface itself of the molding die is made of a material having a small frictional resistance, it is easy to move on the mold surface of the decorating sheet, and You can easily loosen the seat.

According to the present invention as set forth in claim 7, since the mold surface of the molding die has a heat insulating structure in which heat of the decorating sheet is not transmitted, heat transfer of the decorating sheet does not occur. The formability of the decorative sheet does not deteriorate.

[Brief description of drawings]

FIG. 1 is an explanatory sectional view showing a manufacturing apparatus according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing the main parts of the same device.

FIG. 3 is a cross-sectional view showing an operating state of a sheet suction member.

FIG. 4 is a cross-sectional view showing an operating state of a sheet suction member.

FIG. 5 is a sectional explanatory view showing another embodiment of the present invention.

FIG. 6 is a sectional explanatory view showing still another embodiment of the present invention.

FIG. 7 is a sectional explanatory view showing another embodiment of the present invention.

FIG. 8 is a cross-sectional explanatory view of a conventional device.

FIG. 9 is a perspective view of a resin molded product.

FIG. 10 is a cross-sectional explanatory view of a main part of a conventional device.

FIG. 11 is an explanatory diagram comparing the elongation percentages of the decorative sheets.

[Explanation of symbols]

3, 4 ... Mold, 3a ... Mold surface, 5 ... Clamping member,
6 ... Heating means, 10 ... Adsorption device, 20 ... Loosening means, 21 ... Sheet adsorption member, 42 ... Surface of flat part, 4
9 ... Air layer, A ... Flat part, B ... Recess, Ba ... Bottom of recess, S ... Decorative sheet, W ... Resin molded product.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification number Reference number within the agency FI Technical display location // B29K 105: 20 B29L 9:00 (72) Inventor Toshio Takahashi 2 Takaracho, Kanagawa-ku, Yokohama-shi, Kanagawa Address Within Nissan Motor Co., Ltd.

Claims (7)

[Claims] 1. A decorative sheet having a heat-deformable pattern provided between a pair of molding dies is adsorbed and fixed to a molding surface of one of the molding dies having a flat portion and a recess, and then the other die is pressed. A method for producing a patterned injection-molded product, in which a molten synthetic resin is injected into a cavity and the molded resin molded product is patterned by the decorating sheet, wherein one of the decorating sheets is molded. The negative pressure is applied after clamping the mold surface of the mold, heating the decorating sheet, and loosening by applying negative or positive air pressure to the decorating sheet in the mold surface. A method for producing a patterned injection-molded product, characterized in that the product is sucked and fixed to the mold surface of one of the molds by being supplied. 2. The slackening of the decorating sheet is performed by sucking a part of the decorating sheet before the decorating sheet sucked under negative pressure comes into contact with the molding die. The manufacturing method according to claim 1, wherein the recess is formed in the mold surface. 3. The slackening of the decorating sheet is performed by clamping the periphery of the decorating sheet around the mold surface of the one mold and blowing out positive pressure air from the mold surface side of the mold. The manufacturing method according to claim 1, wherein the decoration sheet is bulged so as to be uniformly stretched. 4. A pair of molding dies provided such that the mold surfaces face each other, a decorative sheet with a pattern provided between the molding dies, and a flat portion and a concave portion of the decorative sheet. Adhesive means for adsorbing and fixing by negative pressure to the mold surface of one of the molding dies, the synthetic resin melted from the other mold is injected into the cavity, and the decorative sheet for the molded resin molded product. A device for manufacturing a patterned injection-molded article, which is designed to be patterned by a method, comprising: a clamp member for clamping the decorating sheet around the mold surface of one of the molding dies, and heating the clamped decorating sheet. As described above, it is possible to have movable heating means installed opposite to the mold surface of the molding die, and slackening means for applying positive or negative air pressure so as to cause slack in the heated decorating sheet. Manufacture of characteristic injection-molded products apparatus. 5. The slackening means has a sheet adsorbing member made of a porous material that is provided so as to be retractable from the bottom surface of the recess formed in the mold surface of the molding die, and the sheet adsorbing member is Before the decorative sheet is adsorbed and fixed to the mold surface of one of the molding dies by the adsorbing means, a part of the decorative sheet is adsorbed and controlled so as to be drawn into the recess. The manufacturing apparatus according to claim 4. 6. The mold surface of one of the molds having the concave portion and the flat portion is such that at least the surface of the flat portion is made of a material having a small frictional resistance. Manufacturing equipment. 7. The mold surface of the one molding die has the recess and the flat portion, and at least the flat portion has a heat insulating structure such that heat of the decorating sheet is not transmitted to the molding die. The manufacturing apparatus according to any one of claims 4 to 6, characterized in that.