JPH1142663A - Method and apparatus for producing resin molded object - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a resin molded object producing method capable of integrally and simply molding a resin molded object having a meshlike small diameter porous part formed at a part of a resin base material thereof without generating planar burr and vertical burr and, a manufacturing apparatus adapted thereto. SOLUTION: The region corresponding to the small diameter porous part on the inner wall side of a movable mold 13 or fixed mold 11 is extended so as to come into contact with the inner wall of the partner mold to form a small diameter perforation forming part 21 and a large number of small diameter columnar members 22 are provided in the region corresponding to the small diameter perforation part of the inner wall of the fixed mold or movable mold so as to protrude at a constant interval and both molds are closed to bring the small diameter columnar member 22 formed in the inner wall of the movable mold or fixed mold into contact with the inner wall of the partner mold and a molten resin is supplied to the gap 23 formed in the part free from the small diameter perforation forming part between the fixed mold and the movable mold to be pressed.

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 press-forming a thermoplastic resin for obtaining a resin-molded article having a small-sized mesh-shaped porous portion formed in at least a part of a resin substrate. In the 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. And a manufacturing apparatus therefor.

[0002]

2. Description of the Related 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.

Conventionally, as shown in FIG. 12, a circular small-diameter porous portion in which a plurality of mesh-shaped small-diameter holes are formed in a portion corresponding to a speaker-embedded portion such as below the armrest 61 or the like. (Speaker grill) A resin door trim 60 provided with a 62 is used, and this is installed inside a metal door to be used as an interior member. In particular, recently, a skin member 63 such as synthetic leather partially manufactured from vinyl chloride, polyethylene, polypropylene, synthetic rubber, or the like may be attached to a part of the door trim 60 in order to impart a sense of quality. Is being done.

As a method of manufacturing such a door trim, a resin molded body having a small-diameter porous portion in which a plurality of small-diameter mesh holes are formed by integral molding by injection molding is manufactured. There is a method of manufacturing a door trim by partially attaching a skin member such as leather to the surface of a resin molded product via an adhesive.

[0005]

By the way, these days,
An injection press molding method (referred to as stamping molding) in which molten resin is supplied between a pair of fixed molds and a movable mold to press-mold the molten resin by closing the movable mold with respect to the fixed mold. (Hereinafter sometimes referred to as “injection press”).

That is, in such an injection press, since 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, molding is performed. Compared with the injection molding method, it is widely used at present because it has advantages such as less residual strain and less deformation of a molded product.

Further, in this injection press, a skin member is previously mounted between a fixed mold and a movable mold, and thereafter, a resin is injected to form a skin layer on the surface of the resin molded body simultaneously by welding. it can. However, this method
It is not suitable as a method for manufacturing a resin molded article having a small-diameter porous portion in which a plurality of small-diameter mesh-shaped holes are formed as described above.

According to the conventional method, as shown in FIG. 13 and FIG.
A plurality of small-diameter columnar bodies 112 protruding from one side are provided at predetermined intervals, and the movable mold 113 is lowered (closed) with respect to the fixed mold 111 to form a gap 119 between the two molds. After the formation, the molten resin B is injected from the extruder 102 or the like through the passage 117 of the hot runner block 116 from the gate portion 115 opened on the upper surface of the fixed mold into the gap 119 between the two molds. Further, by closing the movable mold, it is conceivable that the molten resin is made to flow evenly by the mold clamping pressure to be molded.

However, in such a method, the injected molten resin B is fixed to the lower end of the small-diameter columnar body 112 of the movable mold 113 as the movable mold 113 descends, as shown in FIG. Since the molten resin B ′ is cast (enters) between the upper surface 114 of the mold 111 and the molten resin B ′, the portion becomes a planar so-called burr, and a plurality of small-diameter mesh-shaped holes are formed after molding. There is a risk of clogging, and it is practically difficult to form a hole 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 previously formed by an injection press, and a small mesh-shaped small diameter is separately provided. Usually, a small-diameter porous portion in which a plurality of holes are formed is formed by injection molding, and the two are combined (attached) to manufacture a door trim. In such a way,
The process is complicated and troublesome, and the manufacturing cost is high.

Further, as a method of manufacturing the door trim, a resin molded body having a small-diameter porous portion in which a plurality of small-diameter holes of a mesh shape are formed by integrally or separately molding by injection molding, In the method of partially attaching a skin member such as leather to the surface of the resin molded body via an adhesive, an adhesive application operation and a skin member attachment operation are required, and the process is complicated and time-consuming. Manufacturing costs were high.

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 on at least a part of a resin base material without generating flat burrs in the small-diameter porous portion. It is an object of the present invention to provide a method of manufacturing a resin molded body that can be easily and integrally molded by an injection press, and a manufacturing apparatus therefor.

[0013]

SUMMARY OF THE INVENTION The present invention has been made to attain the objects and objects of the prior art as described above. A method for supplying a molten resin between a mold and a movable mold, and press-molding the molten resin to obtain a resin molded body in which a small-diameter porous portion having a mesh shape is partially formed. A portion corresponding to the small-diameter porous portion on the inner wall side of the movable mold or the fixed mold is extended so as to be in contact with the other mold inner wall to form a small-diameter porous forming portion,
On the inner wall of the fixed mold or the movable mold, a plurality of small-diameter columnar members are protruded from a portion corresponding to the small-diameter porous forming portion at a predetermined interval, and the movable mold is closed with respect to the fixed mold. The small-diameter columnar member formed on the inner wall of the movable mold or the fixed mold is brought into contact with the mold inner wall of the counterpart mold, and the small-diameter porous member is formed between the fixed mold and the movable mold. The molten resin is supplied to the void formed in the portion excluding the portion, and the molten resin supplied to the portion is pressed to obtain a resin molded body in which a small-diameter porous portion having a mesh shape is partially formed. It is characterized by the following.

Further, the apparatus for producing a resin molded article according to the present invention comprises:
A manufacturing apparatus for supplying a molten resin between a pair of fixed molds and a movable mold and press-molding the molten resin to obtain a resin molded body in which a small-diameter porous portion having a mesh shape is partially formed. A portion corresponding to the small-diameter porous portion on the inner wall side of the movable mold is extended so as to abut the mold inner wall on the fixed mold side to form a small-diameter porous forming portion, and the fixed mold is formed. Alternatively, on the inner wall of the movable mold, a plurality of small-diameter columnar members are protruded at a portion corresponding to the small-diameter porous forming portion at a predetermined interval, and a pressing core member is provided on a portion of the movable mold excluding the small-diameter porous forming portion. Is provided so as to be able to advance and retreat, and a molten resin supply passage for supplying molten resin to a gap formed in a portion excluding the small-diameter porous portion is provided in the fixed mold between the fixed mold and the movable mold. The movable mold is closed with respect to the fixed mold, and the movable mold or the fixed mold is fixed. The small-diameter columnar member formed on the inner wall of the mold is brought into contact with the inner wall of the mold of the counterpart mold, the molten resin is supplied to the gap, and the molten resin supplied to that portion is pressed by the pressing core member. Then, it is characterized in that it is configured to obtain a resin molded body in which a small-diameter porous portion having a mesh shape is partially formed.

Further, in the apparatus for manufacturing a resin molded product according to the present invention, a molten resin is supplied between a pair of fixed molds and a movable mold, and the molten resin is press-molded to partially form a small-diameter mesh. A manufacturing apparatus for obtaining a resin molded body having a porous portion formed therein, wherein a portion corresponding to the small-diameter porous portion on the inner wall side of the fixed mold is extended so as to abut against a mold inner wall on a movable mold side. And forming a small-diameter porous forming portion, and a plurality of small-diameter columnar members protrudingly provided on a portion corresponding to the small-diameter porous forming portion on the inner wall of the fixed mold or the movable mold, with a predetermined interval therebetween, A pressing core member is provided at a portion of the fixed mold excluding the small-diameter porous forming portion so as to be able to advance and retreat, and a gap formed between the fixed mold and the movable mold in a portion excluding the small-diameter porous forming portion. A molten resin supply passage for supplying molten resin to the fixed mold; Is closed with respect to the fixed mold, the small-diameter columnar member formed on the inner wall of the movable mold or the fixed mold is brought into contact with the mold inner wall of the counterpart mold, and the molten resin is supplied to the gap. Then, the molten resin supplied to the portion is pressed by the pressing core member to obtain a resin molded body in which a small-diameter porous portion having a mesh shape is partially formed. I do.

With this configuration, before the molten resin is supplied to the gap between the fixed mold and the movable mold, the two molds are closed, so that the inner wall of the fixed mold or the movable mold is closed. The small-diameter columnar member formed at the portion corresponding to the small-diameter porous forming portion comes into contact with the inner wall of the counterpart mold, and in this state, the small-diameter porous forming portion is placed between the fixed mold and the movable mold. The molten resin can be supplied to the void formed in the removed portion. Therefore, the molten resin supplied in this way is pressed by the pressing core member, and casts over the entire gap, and a plurality of small-diameter columnar members form a small mesh-shaped small-diameter porous portion. The obtained resin molded body is integrally obtained.

Further, before the molten resin is supplied to the gap between the fixed mold and the movable mold, the two molds are closed so that the inner wall of the fixed mold or the movable mold has a small-diameter porous portion. The small-diameter columnar member formed at the corresponding portion was brought into contact with the inner wall of the counterpart mold, and no molten space was formed between the small-diameter columnar member and the inner wall of the counterpart mold. In such a case, molten resin enters such a gap,
Since a plurality of small-diameter mesh-shaped holes are not closed after molding due to planar burrs, and no burrs are formed in the vertical direction, especially on the surface of the resin molded product, the molded product is not molded. Has a good appearance, and a mesh-shaped small-diameter porous portion can be reliably formed without lowering the product value.

Further, since the molten resin thus supplied is pressed by the pressing core member, it is possible to obtain a resin molded body having a small residual distortion, a small deformation of the molded product, and a high mechanical strength. .

In this case, the small-diameter columnar member may be formed on the inner wall side of a portion corresponding to the small-diameter porous forming portion of the movable mold, or conversely, a portion corresponding to the small-diameter porous forming portion of the fixed mold. May be formed on the inner wall side.

Further, between the fixed mold and the movable mold, a portion other than the mesh-shaped small-diameter porous portion is provided.
By sandwiching and molding the skin material in advance, it is possible to partially obtain a two-layer or multilayer molded body, for example,
It can be used for various applications such as interior materials for automobiles such as door trims with speaker grills.

In the resin molded body manufactured by using the method and the apparatus for manufacturing a resin molded body of the present invention, a cavity cut off in the thickness direction is formed in a part of the resin base material. On the resin substrate surface side, a small-diameter porous portion of a mesh shape formed integrally with the resin substrate is formed, and at least a portion of the surface of the resin substrate excluding the small-diameter porous portion, Since the skin layer member is integrally fixed by welding the resin base material, an adhesive applying operation and a skin member attaching operation are unnecessary, the process is simple, and the manufacturing cost is low.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments (examples) of the present invention will be described with reference to the drawings. FIG. 1 is a schematic diagram of an entire manufacturing apparatus provided with the apparatus for manufacturing a resin molded body of the present invention, and FIG. 2 is a cross-sectional view showing a first embodiment of the apparatus for manufacturing a resin molded body of the present invention.

In FIG. 1, reference numeral 1 denotes a manufacturing apparatus provided with a manufacturing apparatus 3 for a resin molded body according to the present invention. The manufacturing apparatus 1 includes an injection unit 2 provided with an injection machine for injecting and supplying a molten resin to a manufacturing apparatus 3 for a resin molded body, and a resin molding for molding the molten resin injected and supplied from the injection unit 2. And a body manufacturing apparatus 3.

As shown in FIGS. 1 and 2, the apparatus 3 for manufacturing a resin molded body includes a fixed mold 11 which constitutes a lower mold fixedly disposed below, and a fixed mold 11 which is disposed above the fixed mold 11. A movable mold 13 is provided, and is configured to be movable up and down by the operation of a platen 12 a of the press machine 12, and constitutes an upper mold that can be closed with respect to the fixed mold 11.

That is, the movable mold 13 has a peripheral portion 13a having a peripheral portion projecting downward, and is surrounded and bent by the peripheral portion 13a to form an internal space 13b. The fixed mold 11 is fitted into the fixed mold 11. In the figure, reference numeral 27 denotes a skin member holding device for holding the skin member when the skin layer member 30 needs to be used. With this configuration, as shown in FIGS. 7 and 8, the skin layer member 30 moves between the peripheral portion 13 a of the movable mold 13 and the side of the fixed mold 11 at the time of press molding. Because it can move, the skin layer member 3
0 can be used as the skin layer member 30 as it is without wrinkling and forming failure, and without performing vacuum forming in advance.

On the upper surface 14 which is the surface of the fixed mold 11 on the movable mold side 13 side, a gate portion 15 for injecting the molten resin onto the upper surface of the fixed mold 11 is opened.
5 is connected to a passage 17 of a hot runner block 16 provided in the fixed mold 11, and the passage 17 of the hot runner block 16 is connected to the injection unit 2. As a result, a certain amount of molten resin is supplied from the injection unit 2 to the passage 1 of the hot runner block 16.
7 and a gate portion 15, and is injected into a gap 19 between the upper surface 14 of the fixed mold 11 and the lower surface of the movable mold 13.

Although not shown, the gate section 15 includes:
After supplying a certain amount of molten resin, the gate 15
It is desirable that an opening / closing member for closing the door be provided. As such an opening and closing member, for example,
A hot nozzle provided with an opening / closing member as disclosed in Japanese Patent No. 69046 may be provided at an end of the hot runner block 16 on the gate portion 15 side.

On the inner wall of the movable mold 13 on the fixed mold 11 side, as a resin molded product, for example, a circular shape having a plurality of small holes of a mesh shape as shown in FIG. When the door trim 60 provided with the small-diameter porous portion (speaker grill) 62 is formed, a portion corresponding to the small-diameter porous portion is extended downward to form the circular small-diameter porous forming portion 21, and the other side is formed. The stationary die 11 is configured to contact the inner wall 14 of the die. A plurality of small-diameter columnar members 22 are provided at a lower end 21 a of the small-diameter porous forming portion 21.
Numerals 22 are arranged in a circle and project from each other so as to be in contact with the mold inner wall 14 of the fixed mold 11.

Further, on the inner wall of the movable mold 13 on the side of the fixed mold 11, a gap 23 is formed in a portion excluding the small-diameter porous forming portion 21.
The core member main body 24a of the core member 24 is slidably fitted in the space 23. A piston rod 25a of a piston-cylinder mechanism 25, which is disposed in the space 23 and is apart from the other and operated by hydraulic pressure, pneumatic pressure, etc., is fixed to the upper part of the core member main body 24a. By the operation of 25, the core member 24 is configured to be capable of moving up and down. In the present embodiment, the piston cylinder mechanism 25 is used as the locking device. However, the locking device is not limited to this. For example, a mechanism in which the rod protrudes by driving a motor may be used.

In this embodiment, the small-diameter columnar member 2
2 and 22 are small-diameter cylindrical members and are arranged in a circular shape.
The small-diameter columnar members 22, 22 can be appropriately changed according to the shape of the plurality of small-diameter holes having a mesh shape, for example, a quadrangular columnar shape. Can be appropriately changed according to the shape of the small-diameter porous portion to be formed.

In this case, the small-diameter columnar members 22, 22
May be formed integrally with the movable mold 13, but as shown in FIG. 3, a substantially cylindrical small-diameter porous portion forming member having the small-diameter columnar members 22, 22 formed therein. If the small-diameter columnar members 22, 22 can be replaced by being worn and damaged if the 29 is detachably fitted and fixed, burrs can be prevented.

Further, in the case of the present embodiment, the fixed mold 11 is arranged below and the movable mold 13 is arranged above and below the fixed mold 11 so as to be movable up and down. The mold 11 and the movable mold 13 are arranged on the left and right sides, and the movable mold 13 is configured to be movable in the left-right direction (lateral direction) with respect to the fixed mold and can be closed. That is, a horizontal molding machine is used. You may.

A method for molding a resin molded article using the apparatus for producing a resin molded article of the present invention thus constituted will be described with reference to FIGS. As shown in FIG. 4, by raising the platen, the movable mold 13 is moved up to a position (standby position) separated from the fixed mold 11 by a fixed distance. At this time, for example, as shown in FIG.
A skin layer member 30 composed of a skin member 31 such as synthetic leather made of vinyl chloride, polyethylene, polypropylene, synthetic rubber or the like and a foamed synthetic resin layer 32 such as polyethylene or polypropylene adhered below the fixed member 11
Between the movable mold 13 and the portion other than the portion where the mesh-shaped small-diameter porous portion is to be formed, both ends thereof are partially held in the skin member holding device 27 in advance (in a direction perpendicular to the plane of FIG. 4). (Holding both ends).

Thereafter, as shown in FIG. 5, the platen is lowered, and the small-diameter columnar members 22 formed in the small-diameter porous forming portion 21 of the movable mold 13 are moved to the inner wall 14 of the fixed mold 11. The movable mold 13 is lowered to a position where the movable mold 13 comes into contact with the mold, and both molds are closed.

In this state, a certain amount of the molten resin A is injected from the injection unit 2 into the passage 1 of the hot runner block 16.
7 and the gate portion 15, and is injected into a gap 19 between the upper surface 14 of the fixed mold 11 and the lower surface of the movable mold 13 (see FIG. 6).

The injected molten resin forms a lump around the gate portion 15 and rises, but the molten resin A flows (flows) to form a gap between the upper surface 14 of the fixed mold 11 and the lower surface of the movable mold 13. Flowing through the entire space 19, the small-diameter columnar member 22,
22 also flows into the gap between the two (see FIG. 7).

In this case, before the molten resin is supplied to the gap between the fixed mold and the movable mold, the two molds are closed so that the small-diameter columnar member formed at the distal end of the small-diameter porous forming portion is opposed to the other. Is in contact with the inner wall of the mold, and no gap is formed between the small-diameter columnar member and the inner wall of the fixed mold that is the counterpart mold. It is possible to reliably form the mesh-shaped small-diameter porous portion without infiltration of the resin, generation of planar burrs, and closure of the plurality of small-diameter mesh-shaped holes after molding.

Next, the fixed mold 11 is moved through the gate 15.
Shortly before the injection of a fixed amount of molten resin between the mold and the movable mold 13 is completed, the piston cylinder mechanism 25 is operated,
If the piston rod 25a is protruded and the core member 24 is moved downward to start press molding of the molten resin,
The molten resin is pressed by the lower surface of the core member main body 24a of the core member 24 to start molding (see FIG. 8).

Thereafter, by raising the platen, the movable mold 13 is raised to the first standby position, and the movable mold 13 is separated from the fixed mold 11.
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. The resin molded body 40 thus obtained is, as shown in FIG.
Cavity part 42 cut off in a thickness direction in a part of resin base material 41
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 resin substrate surface side of the hollow portion 42. The skin layer member 30 is integrally fixed to at least a part of the surface of the resin substrate 41 except for the small-diameter porous portion 43 by welding the resin substrate 41. In addition, the small-diameter porous portion 43
In the above, no flat burrs and no vertical burrs, especially no burrs are generated on the surface of the resin molded body, and a plurality of small-diameter holes of the mesh shape are not closed after molding, and the mesh shape is surely formed. A small diameter porous portion 43 is formed.

Further, since the skin layer member 30 is integrally fixed to the resin base material by welding the resin base material 41, the operation of applying an adhesive and the work of attaching the skin member are unnecessary, and the process is simple. Manufacturing costs are also reduced.

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

In the present embodiment, the skin layer member 30 has a two-layer structure. However, a multi-layer structure having three or more layers or a single-layer structure can be used. FIG. 11 is a cross-sectional view showing another embodiment of the apparatus for manufacturing a resin molded product according to the present invention.

In the resin molding manufacturing apparatus 3 of this embodiment, unlike the first embodiment described above, the fixed mold 11 is different from the first embodiment.
The small-diameter porous forming portion 21 ′ extends on the inner wall of the movable mold 13, that is, the upper surface.
A plurality of small-diameter columnar members 22 ', 22' project downward from the portion corresponding to 1 'at a predetermined interval.

A gap 23 'is formed in the inner wall of the fixed mold 11 except for the small-diameter porous portion 21', and a core member body 24a 'of the core member 24' is formed in the gap 23 '. Are slidably fitted. A piston rod 25a 'of a piston-cylinder mechanism 25' operated by hydraulic pressure, pneumatic pressure, or the like, which is disposed in the space 23 'and is apart from each other, is fixed to a lower portion of the core member main body 24a'. The core member 24 is configured to be able to move up and down by the operation of the piston cylinder mechanism 25 '.

Further, the fixed mold 11 is provided with a hot runner block 16 'connected to the injection unit 2, and this hot runner block 16' connects the core member main body 24a 'of the core member 24'. The gate portion 15 'penetrates and is formed on the upper end surface of the core member main body 24a'.
Is in communication with In this case, hot runner block 1
Reference numeral 6 'has an expandable and contractible structure, for example, a bellows shape, so that the core member 24 moves up and down by the piston cylinder mechanism 25'.

The other components are the same as those of the first embodiment. Therefore, the same components are denoted by the same reference numerals, and description thereof is omitted. Also, a method for obtaining a resin molded body using the apparatus for manufacturing a resin molded body having such a configuration is the same as in the first embodiment described above.
The description is omitted.

With this configuration, in the first embodiment, the molten resin is press-molded by the lowering of the core member 24 on the movable mold side, so that the core on the surface on the front side around the small-diameter porous portion 62 is formed. Although vertical burrs may be generated due to the lowering of the member 24, in the present embodiment, the molten resin is press-molded by raising the core member 24 'on the fixed mold side, and the vertical molding is performed. Even if burrs occur in the direction, the surface is on the back side around the small-diameter porous portion 62, so that the quality of the product does not deteriorate.

In each of the above-described embodiments, the small-diameter columnar members 22 and 22 ′ are formed on the inner wall side of the movable mold 13 at portions corresponding to the small-diameter porous forming portions 21 and 21 ′. Therefore, even if burrs are generated around the small-diameter porous portion having a mesh shape due to abrasion of the small-diameter columnar members 22 and 22 ′, the burrs are not generated on the surface of the resin molded body, and are formed on the back surface of the resin molded body. Will occur,
Although the value of the product is not reduced, the small-diameter columnar members 22 and 22 ′ may be formed on the inner wall side of the fixed mold 11 at portions corresponding to the small-diameter porous forming portions 21 and 21 ′. Of course.

[0050]

As described above, according to the method for manufacturing a resin molded article of the present invention and the apparatus for manufacturing the same, before the molten resin is supplied to the gap between the fixed mold and the movable mold, the molten resin is formed. By closing the mold, the small-diameter columnar member formed at the portion corresponding to the small-diameter porous portion on the inner wall of the fixed mold or the movable mold comes into contact with the inner wall of the counterpart mold. Thus, the molten resin can be supplied to the gap formed between the fixed mold and the movable mold except for the small-diameter porous portion. Therefore, the molten resin supplied in this way is pressed by the pressing core member, and casts over the entire gap, and a plurality of small-diameter columnar members form a small mesh-shaped small-diameter porous portion. The obtained resin molded body is integrally obtained.

Further, before the molten resin is supplied to the gap between the fixed mold and the movable mold, the two molds are closed so that the inner wall of the fixed mold or the movable mold has a small diameter porous forming portion. The small-diameter columnar member formed at the corresponding portion was brought into contact with the inner wall of the counterpart mold, and no molten space was formed between the small-diameter columnar member and the inner wall of the counterpart mold. In such a case, molten resin enters such a gap,
Since a plurality of small-diameter mesh-shaped holes are not closed after molding due to planar burrs, and no burrs are formed in the vertical direction, especially on the surface of the resin molded product, the molded product is not molded. Has a good appearance, and a mesh-shaped small-diameter porous portion can be reliably formed without lowering the product value.

Further, since the molten resin thus supplied is pressed by the pressing core member, it is possible to obtain a resin molded body having a small residual distortion, a small deformation of the molded product, and a high mechanical strength. .

Also, between the fixed mold and the movable mold,
A portion other than the mesh-shaped small-diameter porous portion is preliminarily sandwiched and molded with a skin material, whereby a two-layer or multilayer molded body can be partially obtained. It can be used for various purposes such as interior materials for automobiles such as door trim.

Further, when a resin material is produced by using the method and apparatus for producing a resin molded product of the present invention, if a skin material is used, the skin layer is integrally formed on the resin substrate by welding the resin substrate. Since they are fixed, there is no need for an adhesive application operation and a skin member attaching operation, the process is simple, and the manufacturing cost is low.

Therefore, according to the present invention, a resin molded product in which a small-diameter porous portion having a mesh shape is partially formed, for example,
It can be used for various purposes such as interior materials for automobiles such as door trims with speaker grills, ceiling materials having ventilation openings, and cooling and heating panel members.

[Brief description of the drawings]

FIG. 1 is a schematic view of an entire apparatus for manufacturing a resin molded article provided with the apparatus for manufacturing a resin molded article of the present invention.

FIG. 2 is a first view of an apparatus for manufacturing a resin molded product according to the present invention.
It is sectional drawing which shows Example of (a).

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

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

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

FIG. 6 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. 7 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. 8 is a schematic diagram illustrating a method for manufacturing a resin molded body using the apparatus for manufacturing a resin molded body of the present invention.

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

FIG. 10 is a partially enlarged cross-sectional view of a resin molded product obtained by the present invention.

FIG. 11 is a cross-sectional view of another embodiment of the apparatus for manufacturing a resin molded product according to the present invention.

FIG. 12 is a perspective view of a door trim showing an example of a resin molded product obtained by the present invention.

FIG. 13 is a schematic diagram illustrating a method for manufacturing a resin molded article having a small-diameter porous portion using a conventional stamping molding method.

FIG. 14 is a schematic diagram for explaining a method for manufacturing a resin molded article having a small-diameter porous portion by using a conventional stamping molding method.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Manufacturing apparatus of resin molded body 2 ... Injection unit part 3 ... Manufacturing apparatus of resin molded body 4 ... Unloading apparatus 11 ... Fixed mold 13 ... Movable mold 15 Gate 16 Hot runner block 21 Small pore forming part 22 Small columnar member 24 Core member

Claims (3)

[Claims] 1. A molten resin is supplied between a pair of fixed molds and a movable mold, and the molten resin is press-molded to form a resin molded body in which a small-diameter porous portion having a mesh shape is partially formed. A method for obtaining, wherein a portion corresponding to the small-diameter porous portion on the inner wall side of the movable mold or the fixed mold is extended so as to contact the inner wall of the counterpart mold to form a small-diameter porous forming portion. In addition, on the inner wall of the fixed mold or the movable mold, a plurality of small-diameter columnar members are protruded from a portion corresponding to the small-diameter porous forming portion at a predetermined interval, and the movable mold is fixed to the fixed mold. And close the small-diameter columnar member formed on the inner wall of the movable mold or the fixed mold to the mold inner wall of the counterpart mold, between the fixed mold and the movable mold, The molten resin is supplied to the void formed in the portion excluding the small-diameter porous portion, and is supplied to that portion. A method for producing a resin molded product, comprising: pressing a supplied molten resin to obtain a resin molded product in which a small-diameter porous portion having a mesh shape is partially formed. 2. A molten resin is supplied between a pair of fixed molds and a movable mold, and the molten resin is press-molded to form a resin molded body in which a small-diameter porous portion having a mesh shape is partially formed. A manufacturing apparatus, wherein a portion corresponding to the small-diameter porous portion on the inner wall side of the movable mold is extended so as to abut the mold inner wall on the fixed mold side to form a small-diameter porous forming portion. A plurality of small-diameter columnar members projecting from the inner wall of the fixed mold or the movable mold at a portion corresponding to the small-diameter porous forming portion at a predetermined interval, and removing the small-diameter porous forming portion of the movable mold. A pressing core member is provided at a portion so as to be able to advance and retreat, and a molten resin supply passage for supplying the molten resin to a gap formed at a portion excluding the small-diameter porous forming portion is provided between the fixed mold and the movable mold. The movable mold is closed with respect to the fixed mold; The small-diameter columnar member formed on the inner wall of the mold or the fixed mold is brought into contact with the mold inner wall of the counterpart mold, and the molten resin is supplied to the gap, and the molten resin supplied to that portion is An apparatus for manufacturing a resin molded product, characterized in that a resin molded product in which a small-diameter porous portion having a mesh shape is partially formed by pressing with a pressing core member is obtained. 3. A molten resin is supplied between a pair of fixed molds and a movable mold, and the molten resin is press-molded to form a resin molded body in which a small-diameter porous portion having a mesh shape is partially formed. A manufacturing apparatus, wherein a portion corresponding to the small-diameter porous portion on the inner wall side of the fixed mold is extended so as to abut the mold inner wall on the movable mold side to form a small-diameter porous forming portion. A plurality of small-diameter columnar members projecting from the inner wall of the fixed mold or the movable mold at a portion corresponding to the small-diameter porous forming portion at a predetermined interval, and excluding the small-diameter porous forming portion of the fixed mold. A pressing core member is provided at a portion so as to be able to advance and retreat, and a molten resin supply passage for supplying the molten resin to a gap formed at a portion excluding the small-diameter porous forming portion is provided between the fixed mold and the movable mold. The movable mold is closed with respect to the fixed mold; The small-diameter columnar member formed on the inner wall of the mold or the fixed mold is brought into contact with the mold inner wall of the counterpart mold, and the molten resin is supplied to the gap, and the molten resin supplied to that portion is An apparatus for manufacturing a resin molded product, characterized in that a resin molded product in which a small-diameter porous portion having a mesh shape is partially formed by pressing with a pressing core member is obtained.