WO1998056556A1

WO1998056556A1 - Resin molding, process for manufacturing the same, and manufacturing apparatus therefor

Info

Publication number: WO1998056556A1
Application number: PCT/JP1998/002527
Authority: WO
Inventors: Mitsuru Watari; Takashi Kimura; Naoyuki Yazaki
Original assignee: Grand Polymer Co., Ltd.
Priority date: 1997-06-13
Filing date: 1998-06-08
Publication date: 1998-12-17
Also published as: JPH11941A; JP3839135B2

Abstract

A process and apparatus for manufacturing integrally and readily resin moldings having a portion where holes of small diameters are arranged in a mesh like pattern and having no planar burrs. A process for press-molding molten resin by supplying the molten resin into a cavity between a pair of a fixed mold (11) and a movable mold (13) and closing the cavity by the movable mold, comprising interposing a plurality of small diameter columnar members (22) arranged at regular intervals between a core member (24) formed in part of the fixed mold protrusibly toward the movable mold, supplying molten resin into the cavity (19) formed between the fixed mold and the movable mold, closing the cavity by the movable mold, and press molding the molten resin while moving back the core member by the pressure thereby to produce a resin molding having a portion where holes of small diameters are arranged in a mesh.

Description

TECHNICAL FIELD The present invention relates to a resin molded product in which a mesh-shaped small-diameter multi-hole portion is formed in at least a part of a resin base material, a production method therefor, and a method for producing the same. More specifically, the molten resin is press-formed by supplying molten resin between a pair of fixed molds and a movable mold, and closing the movable mold with respect to the fixed mold. The present invention relates to a method of manufacturing a resin molded body and a manufacturing apparatus for the same. BACKGROUND ART In recent years, with the diversification of needs for automobiles, for example, loudspeakers of audio systems in automobiles have been embedded in doors of automobiles. For this reason, conventionally, as shown in FIG. 13, a circular shape having a plurality of mesh-shaped small-diameter holes formed in a portion corresponding to an embedded portion of a speaker, such as below the armrest 61, or the like. A resin door trim 60 equipped with a small-diameter porous part (speed grill) 62 is used, and this is attached to the inside of a metal door and used as an interior member. I have. In particular, recently, in order to impart a sense of quality to a part of the door trim 60, a skin member 6 such as a synthetic leather partially manufactured from vinyl chloride, polyethylene, polypropylene, synthetic rubber, or the like is used. 3 Sticking is done.

As a method of manufacturing such a drim, a resin molded body having a small-diameter porous portion in which a plurality of small-diameter mesh-shaped holes are formed by injection molding is manufactured. Later, or after the resin molded body and the small-diameter porous portion are separately manufactured and combined, a skin member such as leather is partially adhered to the surface of the resin molded body via an adhesive, and the door is closed. There is a method for manufacturing rims.

By the way, recently, injection press molding, in which molten resin is supplied between a pair of fixed molds and a movable mold, and the movable mold is closed with respect to the fixed mold, thereby press-molding the molten resin. Methods (sometimes referred to as stubbing molding) (hereinafter, these methods are collectively referred to as “injection presses”) have been developed.

In other words, in such an injection press, the molten resin supplied at a low pressure between the slightly opened fixed mold and the movable mold is made to flow uniformly by the mold clamping pressure, so that molding is performed. Compared to the injection molding method, it is widely used at present because of its advantages such as low residual strain and small deformation of molded products.

In this injection press, a skin member is previously mounted between a fixed mold and a movable mold, and a skin layer can be simultaneously formed on the surface of the resin molded body by welding. However, this method is not suitable as a method for producing a resin molded body having a small-diameter porous portion having a plurality of small-diameter mesh-shaped holes as described above.

According to the conventional method, as shown in FIG. 14, a plurality of small-diameter columnar bodies 1 1 2 protruding from the fixed mold 1 1 1 side to a part of the movable mold 1 1 3 are fixed. m Separated, the movable mold 1 13 is lowered (closed) with respect to the fixed mold 1 1 1 to form a gap 1 19 between the two molds. From 1 2, etc., through the passage 1 17 of the hot runner block 1 16 through the gate 1 1 5 opening on the upper surface of the fixed mold 1 1 5 Inject to 9 and close the movable mold to allow the molten resin to flow evenly by the clamping pressure! ] And molding.

However, in such a method, as shown in FIG. 15, as the injected molten resin B force and the movable mold 113 descend, the small-diameter columnar body 1 1 2 The molten resin B 'flows between the lower end of the mold and the upper surface 1 1 4 of the fixed mold 1 1 1 4 (penetration), so that portion becomes a flat so-called burr, and after molding, There is a possibility that a plurality of small holes having a mesh shape may be closed, and it is difficult to form the holes by such a method.

Therefore, at present, as a method of manufacturing such a door trim, a resin molded body having a portion corresponding to a speaker buried portion as a missing portion is formed in advance by an injection press, and a separate mesh is formed. Usually, a small-diameter porous portion having a plurality of small-diameter holes is formed by injection molding, and the two are combined (attached) to produce a door trim. In such a method, the process is complicated and time-consuming, and the production cost is high.

Further, as a method of manufacturing a door trim, a small-diameter porous portion in which a plurality of mesh-shaped small-diameter holes are formed by injection molding or a body or separately. After manufacturing a resin molded body provided with The method of partially attaching a skin member such as leather to the surface of the product via an adhesive requires an adhesive application work and a skin material sticking work, which is cumbersome and time-consuming. Costs were getting higher. DISCLOSURE OF THE INVENTION In view of the above situation, the present invention provides a resin molded article in which a mesh-shaped small-diameter porous portion is formed in at least a part of a resin and a material. It is an object of the present invention to provide a method of manufacturing a resin molded body that can be easily and physically molded by an injection press without generating burrs, and a manufacturing apparatus therefor.

In addition, the present invention provides a method for manufacturing a resin molded body manufactured by using such a manufacturing method and a manufacturing apparatus in which a mesh-shaped small-diameter porous portion is formed on at least a part of a resin substrate. It is an object of the present invention to provide a resin molded product in which a surface member such as synthetic leather is directly adhered without using an adhesive or the like.

The present invention has been invented in order to combine the problems and the objectives in the prior art as described above.

In the molding method, a molten resin is supplied between a pair of fixed molds and a movable mold, and the movable mold is closed with respect to the fixed mold to press-mold the molten resin. A plurality of small-diameter columnar members arranged at a fixed interval between the movable mold and a core member protruding toward a movable mold formed on a part of the core. Five

Material to the movable mold side,

The molten resin is supplied to a gap formed between the fixed mold and the movable mold, the movable mold is closed with respect to the fixed mold, and the molten resin is press-molded, and the press molding is performed. At this time, the core member is retracted by a press pressure, and the molten resin is press-molded to obtain a resin molded body in which a small-diameter porous portion having a partially meshed shape is formed. And

Further, the apparatus for manufacturing a resin molded article of the present invention comprises a pair of fixed molds and a movable mold, and a molten resin supply means for supplying the molten resin to a mold gap formed between the two molds. And

A plurality of small-diameter columnar members are provided between the pair of dies, and are disposed at a predetermined interval.

A protrudable core member for holding the plurality of small-diameter columnar members between the two molds and closely contacting the mold surface is fitted to the fixed mold,

The core member is configured to move in the direction of the movable mold when the molten resin is supplied, and to be retracted by the press pressure of the movable mold during the press molding of the molten resin.

With such a configuration, the molten resin supplied to the gap formed between the fixed mold and the movable mold is cast and pressed over the entire gap with the closing of the mold. During pressing, the core member retreats due to the press pressure, so that the molten resin can be pressed, and a plurality of small-diameter columnar members interposed between the core member and the movable mold have a partially mesh-shaped small diameter. Resin molded body with perforated part is integrated Is obtained. In addition, since the molten resin is supplied by projecting the core member toward the movable mold side, no gap is formed between the small-diameter columnar member and the fixed mold or royal mold, so the molten resin is filled in such a gap. The mesh-shaped small-diameter porous portion is reliably formed without the clogging of the plurality of small-diameter mesh-shaped holes after molding due to crowding and planar burrs. Furthermore, the appearance of the molded product is good, and it is possible to maintain an excellent mechanical strength.

In this case, the small diameter columnar member may be formed on the fixed mold side surface of the movable mold, or may be formed on the movable mold side surface of the core member. Even if burrs occur around the mesh-shaped small-diameter porous part due to wear of the members, etc., the burrs will not be generated on the surface of the resin molded body, but will be generated on the back of the resin molded body. Therefore, it is preferable that the movable mold is formed on the fixed mold side surface of the movable mold.

In addition, a skin material is previously sandwiched between the fixed mold and the movable mold at a portion other than the portion where the small-diameter multi-hole portion is to be formed in the mesh shape, and the molding is partially performed. A multilayered or multi-layered molded article can be obtained, and can be used for various applications such as interior materials for automobiles such as door trims with speaker grills.

Further, the resin molded article of the present invention can be produced by the above-described method and apparatus for producing a resin molded article, and has a hollow portion cut off in the thickness direction in a portion of the resin substrate. A mesh-shaped small-diameter multi-hole portion formed integrally with the resin base material is formed on the resin base material surface side of the hollow portion, and the small-diameter porous portion of the resin base material is formed. At least a part of the surface excluding the surface layer is used for welding the resin base material. It is characterized by being more integrally fixed.

As described above, since the skin layer is physically fixed to the resin base material by the welding of the resin base material, there is no need for an adhesive application operation and a skin member adhering operation, so that the process is simple and the manufacturing cost is low. Will also be cheaper. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic view of an entire manufacturing apparatus provided with the apparatus for manufacturing a resin molded product of the present invention.

FIG. 2 is a cross-sectional view showing a first embodiment of the apparatus for producing a resin molded product according to the present invention.

FIG. 3 is a cross-sectional view illustrating another embodiment in which a small-diameter columnar member is provided in the apparatus for manufacturing a resin molded product of the present invention.

FIG. 4 is a schematic diagram illustrating a method for producing a resin molded product using the apparatus for producing a resin molded product of the present invention.

FIG. 5 is a schematic diagram illustrating a method for producing a resin molded body using the apparatus for producing a resin molded body of the present invention.

FIG. 6 is a schematic diagram illustrating a method for producing a resin molded body using the apparatus for producing a resin molded body of the present invention.

FIG. 7 is a schematic diagram illustrating a method for producing a resin molded body using the apparatus for producing a resin molded body of the present invention.

FIG. 8 is a schematic diagram illustrating a method for producing a resin molded body using the apparatus for producing a resin molded body of the present invention.

FIG. 9 is a partially enlarged sectional view showing an example of a skin layer member used in the present invention. It is.

FIG. 10 is a partially enlarged cross-sectional view of the resin molded product obtained by the present invention. FIG. 11 is a schematic view of an entire manufacturing apparatus provided with a manufacturing apparatus for a resin molded body according to another embodiment of the present invention.

FIG. 12 is a cross-sectional view of still another embodiment of the apparatus for manufacturing a resin molded product of the present invention.

FIG. 13 is a perspective view of a door trim showing an example of a resin molded product obtained by the present invention.

FIG. 14 is a cross-sectional view illustrating a method for producing a resin molded article having a small-diameter porous portion using a conventional injection press.

FIG. 15 is a cross-sectional view illustrating a method for producing a resin molded article having a small-diameter porous portion using a conventional injection press. BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, an embodiment (example) of the present invention will be described with reference to the drawings.

FIG. 1 is a schematic view of a manufacturing apparatus provided with the apparatus for manufacturing a resin molded article of the present invention, and FIG. 2 is a cross-sectional view showing a first example of the apparatus for manufacturing a resin molded article of the present invention. FIG.

In FIG. 1, reference numeral 1 denotes a manufacturing apparatus provided with a manufacturing apparatus 3 for a resin molded article of the present invention as a whole. The manufacturing apparatus 1 forms an injection unit 2 having an injection machine for injecting and supplying the molten resin to a manufacturing apparatus 3 for a resin molded body, and forms the molten resin injected and supplied from the injection unit 2. And an apparatus 3 for producing a resin molded body for the purpose.

As shown in FIG. 1 and FIG. 2, the resin molded body manufacturing apparatus 3 includes a fixed mold 11 that constitutes a lower mold fixedly arranged on the side and a fixed mold 11 above the fixed mold 11. It is arranged and can be moved up and down by the energization of the platen 1 2a of the press machine 1 2 and is closed to the fixed mold 11 1.It constitutes the upper mold that has iL r'J ability It has a movable mold 13.

That is, the movable mold 13 is formed with a peripheral edge 13 a having a peripheral edge protruding downward, and is surrounded and bent by the peripheral edge 13 a to form an internal space 13 b. The fixed mold 11 is fitted into the internal space 13b. In the drawing, reference numeral 27 denotes a skin member holding device for holding the skin member when the skin layer member 30 needs to be used.

On the upper surface 14 which is the surface of the movable mold side 13 of the fixed mold 11 1, a gate portion 15 for injecting the molten resin onto the upper surface of the fixed mold 11 1 is provided. The port 15 communicates with the passage 17 of the hot runner block 16 provided in the fixed mold 11, and the passage 17 of the hot run block 16 is connected to the passage 17 of the hot runner block 16. The injection unit 2 is connected to the injection unit 2. This allows a certain amount of molten resin to pass through the passage 17 of the hot runner block 16 and the gate unit 1. Through 5, it is injected into a gap 19 between the upper surface 14 of the fixed mold 11 and the lower surface 18 of the movable mold 13.

Although not shown, it is desirable that the gate section 15 be provided with an opening / closing member for automatically closing the gate section 15 after supplying a certain amount of molten resin. As such an opening / closing member, for example, A hot nozzle provided with an opening / closing member as disclosed in Japanese Patent Publication No. 4-69064 may be provided at the end of the hot runner block 16 on the side of the gate portion 15. .

On the other hand, on the lower surface 18 which is the surface of the movable mold 13 on the fixed mold 11 side, as a resin molded product, for example, a plurality of mesh-shaped small diameters as shown in FIG. When molding a door trim 60 having a circular small-diameter porous portion (speaker grille) 62 with a hole formed therein, a predetermined interval is provided between a portion 21 corresponding to the small-diameter porous portion. The small-diameter columnar members 22, 22, which are a plurality of small-diameter cylindrical members protruding from the fixed die 11, are formed in a circular shape.

In this embodiment, the small-diameter columnar members 22 and 22 are formed as small-diameter cylindrical members so as to be arranged in a circular shape. However, the small-diameter columnar members 22 and 22 are mesh-shaped. Depending on the shape of the plurality of small-diameter holes, it can be changed as appropriate, for example, in the form of a square pillar, and its size, arrangement, and size of the holes can be changed as appropriate according to the shape of the target small-diameter porous portion. It is.

In this case, as a method of forming the small-diameter columnar members 22 and 22 on the surface 18 of the movable mold 13, the small-diameter columnar members 22 and 22 are formed on the lower surface of the movable mold 13. Although it may be formed by directly engraving or planting, as shown in FIG. 3, a disk-shaped small multi-hole member 20 having small-diameter columnar members 22 and 22 projecting therefrom is provided with a movable metal member. By fitting and fixing to the cylindrical concave portion 29 formed on the lower surface 18 of the mold 13, various forms of small-diameter porous parts can be formed, and the small-diameter columnar members 22, 22 wear. It can be replaced even if it is damaged, preventing the occurrence of pallets. You.

The stationary die 11 is provided with a core member guide mosquito L 23 at a position corresponding to the position where the small-diameter columnar member 22 is formed, and the core member guide hole 2 A substantially cylindrical core member 24 is provided in 3 so as to be able to protrude from the upper surface 14 of the fixed mold 11. A flange 24 b protruding from the outer peripheral side is formed at the lower end of the core member 24, and the flange 24 b is formed at the end of the guide hole 23. The core member 24 is configured so as not to protrude from the upper surface 14 of the fixed mold 11 beyond a certain dimension by contacting the topper portion 23a. With this configuration, the core member operates as a piston.

Further, a piston chamber 25 is formed below the guide hole 23, and a pressurized cylinder 28 is disposed in the biston chamber 25. The distal end 28B of the screw rod 28A of the pressurized cylinder 28 is fixed to the rear end 24c of the core member 24, and a pressurized oil supply source (not shown). ), Pressurized oil is supplied to the pressurized cylinder 28 through the pipe 26, so that the piston rod 28A protrudes and the core member 24 is fixed to the fixed mold 1 1 It is configured to protrude from the upper surface 14.

In this case, the pressure oil supplied from the pressurized oil supply source causes the piston rod 28 A to protrude, and the pressure for pressing the core member 24 is applied from the injection unit 2 to the upper surface 1 of the fixed mold 11. It is larger than the resin pressure of the molten resin injected into the gap 19 between 4 and the lower surface 18 of the movable mold 13, and the upper surface 14 of the fixed mold 1 1 4 and the lower surface 1 of the movable mold 13 are 1 After the molten resin is injected into the gap 19 between 8 and 8, the movable mold 13 descends to the fixed mold 11 and melts. The pressure must be lower than the pressing pressure when pressing the resin. As a result, the core member 24 protrudes from the upper surface 14 of the fixed mold 11, and the upper end 24 d of the core member 24 is formed on the lower surface 18 of the movable mold 13. When the molten resin is injected into the gap 19 between the upper surface 14 of the fixed mold 11 and the surface 18 of the movable mold 13 when the molten resin comes into contact with 2 However, the core member 24 does not move to the side. Therefore, there is no gap between the ends 22a of the small-diameter columnar members 22 and the upper end 24d of the core member 24, and the molten resin does not enter such a gap. A flat burr does not occur, and a plurality of mesh-shaped small-diameter holes are not blocked after molding, so that a mesh-shaped small-diameter porous portion can be reliably formed. Further, when the movable mold 13 descends to the fixed mold 11 side and presses the molten resin, the pressing force follows the descending of the movable mold 13 due to the pressing pressure, and the core member 24 retreats. Therefore, it is possible to press the molten resin and to form a plurality of mesh-shaped small-diameter holes in predetermined portions.

In the case of the present embodiment, the pressurized oil is supplied from a pressurized oil supply source (not shown) to the pressurized cylinder 28 via the pipe 26, and the piston rod 28A is supplied. The core member 24 is configured to protrude from the upper surface 14 of the fixed mold 11, but the rear end side 24 c of the core member 24 and the bottom 2 3 b of the guide hole 23 are formed. It is also possible to interpose a spring member (not shown) between them and make the core member 24 protrude from the upper surface 14 of the fixed mold 11. Also in this case, as described above, the spring pressure is higher than the injection pressure of the molten resin and is lower than the pressing pressure when pressing the molten resin. Must be smaller.

Further, in the case of the present embodiment, a configuration in which the fixed mold 11 is arranged on the side of the mold and the movable mold 13 is arranged on the upper side so as to be movable up and down, that is, the molding machine is shown as a vertical mold However, the fixed mold 11 and the movable mold 13 are arranged on the left and right, so that the movable mold 13 can be moved in the left and right direction (lateral direction) with respect to the fixed mold and can be closed. That is, a horizontal molding machine may be used.

A method for manufacturing a resin molded body using the apparatus for manufacturing a resin molded body of the present invention thus configured will be described with reference to FIGS.

As shown in FIG. 4, by lowering the platen, the movable mold 13 is lowered to a position separated from the fixed mold 11 by a predetermined distance, and is made to stand by. At this time, as shown in FIG. 9, for example, a skin member 31 such as a synthetic leather 4 '': made of vinyl chloride, polyethylene, polypropylene, synthetic rubber, and the like, and a polyethylene adhered thereunder, A skin layer member 30 composed of a foamed synthetic resin layer 32 of polypropylene or the like is placed between the fixed mold 11 and the movable mold 13 at a portion other than the planned portion of the mesh-shaped small-diameter porous portion. However, the skin member holding device 27 partially holds the both ends thereof in advance (holding both ends in the direction perpendicular to the paper surface of FIG. 4) and sandwiches them.

Then, the pressurized oil is supplied from the pressurized oil supply source to the pressurized cylinder 18 through the pipe line 26, so that the piston rod 28A protrudes to fix the core member 24. Protrude from the upper surface 14 of the mold 11 (see Fig. 5). Then, the upper end 2 4 d of the core member 2 4 is attached to the lower surface 1 of the movable mold 13. "]" 降下 Lower the mold 13 to the position where it comes into contact with the small-diameter columnar members 22 formed in FIG.

In this state, a certain amount of molten resin より from the injection unit 2 is movable with the upper surface 14 of the fixed mold 11 through the passage 17 of the hot runner block 16 and the gate 15. Inject into the gap 19 between the lower surfaces 18 of the mold 13 (see FIG. 6). The injected molten resin forms a block around the gate section 15 and rises, but the molten resin A is cast (flowed), and the upper surface 14 of the fixed mold 11 and the lower surface 1 of the movable mold 13 are formed. It flows through the entire space 19 between the gaps 8 and also flows into the gap between the small-diameter columnar members 22 (see FIG. 7).

In this case, the pressurized oil supplied from the pressurized oil supply source causes the piston rod 28 A to protrude, and the pressure for pressing the core member 24 is applied from the injection unit 2 to the upper surface of the fixed mold 11. Since it is set to be larger than the resin pressure of the molten resin injected into the li: 'd gap 19 of the T face 18 of the movable mold 13 and the movable mold 13, the core is formed by the resin pressure of the molten resin. The member 24 does not move downward. Accordingly, there is no gap between the lower end 22a of the small-diameter columnar members 22 and 22 and the upper end 24d of the core member 24. No burrs are generated, and a plurality of mesh-shaped small-diameter holes are not blocked after molding, so that a mesh-shaped small-diameter porous portion can be reliably formed.

Next, shortly before the injection of a fixed amount of molten resin between the fixed mold 11 and the movable mold 13 via the gate portion 15 is completed, the movable mold is lowered by lowering the platen. When the mold 13 is further lowered in the direction of the fixed mold 11 and the closing of both molds is started, the lower surface 18 of the movable mold 13 is used. The molten resin is pressed to start molding (see Fig. 8).

At this time, the pressure ήΙ.1 supplied from the pressurized oil supply source causes the piston rod 28 A to protrude.

Since the pressure for pressing the core member 24 is set to be lower than the pressing pressure for pressing the molten resin by moving the movable mold 13 down to the fixed mold 11 side, the pressing pressure is set. As a result, the core member 14 can retreat following the lowering of the movable mold 13, so that the molten resin is pressed and a plurality of small mesh-shaped holes are formed at predetermined positions. A part can be formed.

Thereafter, the movable mold 13 is completely closed with respect to the fixed mold 11 to complete the press molding.

After the completion of press molding, the platen is raised to raise the movable mold 13 to the initial standby position, so that both molds are separated from each other, and the resin molded body 40 is taken out.

By repeating the above cycle, the method for producing a resin molded article of the present invention is performed.

In the resin molded body 40 obtained in this manner, as shown in FIG. 10, a cavity 42 notched in the thickness direction is formed in a part of the resin base material 41, and this cavity 4 A small-diameter porous portion 43 having a mesh-shaped small-diameter hole 44 formed integrally with the resin substrate 41 is formed on the surface side of the resin substrate 2. Further, a skin layer member 30 is integrally fixed to at least a part of the surface of the resin base material 41 except for the small-diameter porous portion 43 by welding with the resin base material 41. In addition, in the small-diameter porous portion 43, no planar burrs are generated, and the mesh-shaped small-diameter composite is formed after molding. The mesh-shaped small-diameter porous portion 43 is reliably formed without blocking a number of holes.

In addition, since the skin layer member 30 is integrally fixed to the resin base material by welding the resin base material 41, an adhesive application work and a skin member sticking work are unnecessary, and the process is simple. However, the manufacturing cost is also reduced.

In the case of the present embodiment, a method of obtaining a resin molded body to which a skin layer member is partially fixed has been described. However, the method of manufacturing a resin molded body of the present invention and a manufacturing apparatus therefor are described in the following. The present invention is also applicable to a case where a single-layer resin molding rest in which a small-diameter porous portion having a mesh shape is partially formed where the member is not fixed is formed.

Further, as the skin layer member 30, in this embodiment, a two-layer one is used, but a three- or more-layer one or a single-layer one can also be used.

Further, in the case of the present embodiment, a fixed amount of molten resin is injected from the injection unit 2 through the passage 17 of the hot runner block 16 and the gate 15 through the fixed mold. It was configured to be injected into the gap 19 between the upper surface 14 of 11 and the lower surface 18 of the movable mold 13, but as shown in Fig. 11, the hot runner block 16 Without the passage 17 and the gate unit 15, instead of the injection unit 2, a casting unit 50 equipped with an extruder 51 was used instead of the injection unit 2, and X—Y was added to the casting unit 50. With a moving mechanism 52 that can move in the direction, the molten resin is poured onto the upper surface 14 of the solid mold 11 through a die 53 arranged at the tip of the casting unit 50. It is also possible to

FIG. 12 is a cross-sectional view showing still another embodiment of the apparatus for producing a resin molded product of the present invention. The resin molded article manufacturing apparatus 3 of this embodiment includes a core 18 instead of protruding small-diameter columnar members 22 and 22 protruding from the fixed die 11 to the lower part 18 of the movable die 13. The point that a plurality of small-diameter columnar members 2 2 ′ and 2 2 ′ that are arranged at a fixed distance from the upper end 24 d of the member 24 and that protrude from the movable mold 13 side are formed as described above. This is different from the first embodiment. Therefore, since the other configuration is the same as that of the first embodiment, the same components are denoted by the same reference numerals, and description thereof will be omitted.

The method of obtaining a resin molded body using the resin molded body manufacturing apparatus having such a configuration is also described by projecting the core member 24 toward the movable mold 13 and forming the upper end 24 d of the core member 24. After the small-diameter columnar members 2 2 ′ and 2 2 ′ formed on the lower mold 18 are brought into contact with the lower surface 18 of the movable mold 13, the gap 1 formed between the fixed mold 11 and the movable mold 13 is formed. 9 is the same as the first embodiment except that the molten resin is supplied, and the description thereof is omitted. Effects of the Invention As described above, according to the method for manufacturing a resin molded body of the present invention and the manufacturing apparatus therefor, the molten resin supplied to the gap formed between the fixed mold and the movable mold can be used. When the mold is closed, it is cast into the entire gap and pressed. During this press, the core member retreats due to the pressing pressure, so that the molten resin can be pressed and move with the core member. By the plurality of small-diameter columnar members interposed between the molds, it is possible to integrally obtain a resin molded body in which a small-diameter porous portion having a mesh shape is partially formed _(in addition, the core member is disposed on the movable mold side). Protrude to supply molten resin Therefore, no gap is formed between the small-diameter columnar member and the fixed mold or the royal mold. The mesh-shaped small-diameter porous portion is reliably formed without the plurality of small-diameter holes having a closed shape being closed. Furthermore, the appearance of the molded product is also good, and it is possible to maintain a sufficient strength and an extremely high mechanical strength.

In addition, by forming a skin material between the fixed mold and the movable mold except for a portion where the mesh-shaped small hole is to be formed, the molding is partially performed. It is possible to obtain a two-layer or multi-layer molded product, and it can be used for various purposes such as interior materials for automobiles such as door trims with speaker grills.

Further, the resin molded article of the present invention can be produced by the above-described method and apparatus for producing a resin molded article of the present invention, and the skin layer is integrally formed on the resin base material by welding the resin material. Since they are fixed, there is no need for an adhesive / coating operation and a skin member adhering operation, the process is simple, and the manufacturing cost is low.

Therefore, according to the present invention, a resin molded product partially formed with a mesh-shaped small-diameter porous portion, for example, an automotive interior material such as a door trim equipped with a speaker grill, a ceiling material having a ventilation opening It can be used for various applications such as panel members for air conditioning and heating.

Claims

The scope of the claims

1) In a molding method in which molten resin is supplied between a pair of fixed molds and a movable mold, and the movable mold is closed with respect to the fixed mold to press-mold the molten resin,

A plurality of small-diameter columnar members arranged at a fixed distance from each other are interposed between the movable mold and a core member formed on a part of the fixed mold and protruding toward the movable mold. The core member is moved out of the movable mold side, and molten resin is supplied to a gap formed between the fixed mold and the movable mold. Close and press-mold the molten resin,

At the time of the press molding, the core member is retracted by a press pressure and the molten resin is press-molded to obtain a resin molded body in which a small-diameter mesh-shaped porous portion is partially formed. Manufacturing method of a molded resin article.

2) —Consisting of a pair of fixed mold and movable mold, and molten resin supply means for supplying molten resin to a mold cavity formed between both molds,

Between the pair of dies, a small number of small-diameter columnar members arranged at a fixed interval are arranged,

A protrudable core member is attached to the fixed mold so as to sandwich the plurality of small-diameter columnar members between the two molds and make close contact with the mold surface.

The core member moves in the direction of the movable mold when the molten resin is supplied. It is characterized in that it is configured to be retracted by the press pressure of the movable mold during press molding of the molten resin. For manufacturing resin moldings.

3) The apparatus for manufacturing a resin molding stand according to claim 2, wherein the small-diameter columnar member is formed on a fixed mold side surface of a movable mold.

4) The apparatus according to claim 2, wherein the small-diameter columnar member is formed on a surface of a movable mold of the core member.

5) An M-shaped part cut in the thickness direction is formed in the portion of the resin base material, and a mesh shape formed integrally with the resin base material on the resin base material surface side of the cavity. And a skin layer member is integrally fixed to at least a part of the surface of the resin substrate excluding the small-diameter porous portion by welding with the resin substrate. A resin molded article characterized by the following: