JP2892612B2 - Molding mold for powder molding, method for producing powder molded article, and powder molded article - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a molding die for powder molding, a method for producing a powder molded product, and a powder molded product produced by the method.

[0002]

2. Description of the Related Art Conventionally, there are two types of molding dies for powder molding. One molding die 50 is, as shown in FIG. 18, a closed female mold 55 for molding a powder molded product,
And a holding shaft 56 for holding the female mold 55. An opening (not shown) is formed in the female mold 55, and a lid for closing the opening is provided. A method of manufacturing a powder molded product using the molding die 50 is as follows. A cover (not shown) is removed, a thermoplastic resin powder is put into the female mold 55 through an opening, and the female mold 55 is rotated while the heater is externally heated. Heat at 57. The thermoplastic resin powder melts and adheres to the inner wall of the female mold 55 to form a resin molten layer. The female mold 55 is cooled to cure the resin molten layer, and a powder molded product is formed. This powder molded product can be taken out from the opening by removing the lid (not shown) of the female mold 55.

[0003] Another molding die 60 for powder molding is:
As shown in FIGS. 16 and 17, a female die 62 having a powder input port 61 and a flat holding member 63 attached to the periphery of the powder input port 61 of the female die 62 are provided. The holding member 63 is held in the molding die 60 by a known powder slush molding device or the like, and is transferred to a heating unit, a powdering unit, a cooling unit, a demolding unit, and the like, and powder molding is automatically performed. Of course, powder compaction can also be performed manually.

The conventional method for manufacturing a powder molded product using a molding die 60 for powder molding involves heating the outside or inside of a female mold 62 with a heater or hot air or the like and then passing the female mold 6 through a powder inlet 61.
When the thermoplastic resin powder is put into the mold 2, the thermoplastic resin powder melts and adheres to the inner wall of the female mold 62 to form a resin molten layer. Excess thermoplastic resin powder is discharged from the powder inlet 61 of the female mold 62, and when cooled, the molten resin layer is hardened and the powder molded product 65 is formed. This powder molded product 65 can be taken out from the powder inlet 61 of the female mold 62. The thermoplastic resin powder is a powder of a vinyl chloride resin, polyethylene, polypropylene or the like.

[0005]

In the conventional molding die 50 for powder molding, it takes a lot of time to attach and detach the lid of the female mold 55, and since it can be heated only from the outside, it takes a long time for molding. There was a point. In addition, since the powder molded product molded by the manufacturing method using the molding die 50 is sealed, it looks as a finished product, but the thermoplastic resin powder remaining inside cannot be discharged. There were also problems.

[0006] A later molding die 60 for powder molding is as follows.
Since the inside of the female mold 62 can be heated from the powder inlet 61 at the same time as the outside of the female mold 62 is heated, the heating speed is high, the molding can be performed in a short time, and the thermoplastic resin powder remaining inside is removed. It can be discharged from the powder inlet 61.
However, there is a problem that a part 64 of the powder molded product 65 manufactured by the manufacturing method using the molding die 60 is opened by the powder inlet 61. In order to close the opening 64, there is a problem that a step of molding the lid with another molding die for powder molding and a step of closing the opening 64 with the lid are required. In addition, since the powder molded product 65 and the lid are formed in different processes, these colors,
The wall thickness was slightly different, and depending on what you saw, you could see that it was clearly molded and attached, and the product was incomplete.

[0007] A powder molded product produced by a conventional molding die and a production method is formed into a thin wall, has excellent tactile sensation and elasticity, and when used as a skin of a doll or an animal toy, is close to a real human or animal. However, it could not be used due to the following problems. That is, the powder molded product produced by the production method using the molding die 50 cannot discharge the thermoplastic resin powder remaining inside due to its hermeticity, and also has no filling or filling inside. A drive device or the like cannot be incorporated.

[0008] Since the opening 64 is formed from the beginning, the powder molded product 65 manufactured by the manufacturing method using the molding die 60 does not adhere to the inside using the opening 64. Although the thermoplastic resin powder can be discharged and fillings can be inserted, it is necessary to close the opening 64 with the lid molded in another molding step as described above. As described above, since the powder molded product 65 and the lid are formed in separate molding steps, it takes time, effort, and cost until the finished product is sealed, and at first glance the lid is different from other parts. Because it is different, it is separated from the real thing, and therefore, the powder molded product 65 manufactured by the manufacturing method using the molding die 60 later is a doll,
It could not be used as the skin of animal toys.

As shown in FIG. 16, a conventional molding die for powder molding has no problem if the powder inlet 61 is wide and the internal structure of the female mold 62 is simple. ,
As shown in FIG. 2, when the powder inlet is narrow and the internal structure of the female mold becomes complicated, there is a problem that the inner surface treatment, cleaning, and the like inside the female mold become difficult. That is, if there is an elongated tail, an elongated arm, and an elongated leg like a female type such as a monster toy,
There has been a problem that it is extremely difficult to apply a release agent evenly to the inner surface of the female mold and to remove the residue of the powder molded product that has not adhered to these inner surfaces. Also, the thin part, such as the end of a long tail, is severely damaged,
Even if only this portion is damaged, there is a problem that the entire molding die cannot be used.

The present invention has been devised in view of the above problems, and enables molding to be performed in a short time, removes thermoplastic resin powder remaining inside, and forms the powder through a powder inlet. It is a first object of the present invention to provide a molding die for powder molding capable of simultaneously molding a sub-molded product for closing an opening of a main molded product to be molded and simultaneously improving the molding efficiency. It is a second object of the present invention to provide a molding die for powder molding in which the inner surface treatment, cleaning and the like inside the female mold can be easily performed and the most easily damaged portion of the female mold can be replaced. I do. Furthermore, it has an opening through which the thermoplastic resin remaining inside can be easily removed, and a padding or the like can be inserted, and the opening is closed by a lid having substantially the same thickness and color as the main body. It is a third or fourth object of the present invention to provide a method for producing a powder molded product which can be used as a skin of a doll or an animal toy and has a feeling and elasticity close to that of a real product.

[0011]

According to a first aspect of the present invention, there is provided a molding die for powder molding, which has the following configuration to solve the first problem. (A) A female mold, a communication pipe provided in the female mold, and a holding member provided in the communication pipe. (B) In the female mold, a main molding portion for molding a main molded product by adhering a thermoplastic resin powder to the inner wall in a molten state or a semi-molten state is formed, and one side has a powder inlet for charging the thermoplastic resin powder. Being formed. (C) The female mold is provided with a communication pipe communicating with the female powder inlet. (D) A holding member for holding the female mold is provided around the opening of the communication pipe. (E) A thermoplastic resin powder is adhered to the inner wall of the communication pipe in a molten state or a semi-molten state, and a sub-molding material covering the opening of the main molding which cannot be molded by the female powder inlet is formed. The sub-molding part to be molded must be formed.

A molding die for powder molding according to the second aspect of the present invention has the following configuration in order to solve the second problem. (A) A female mold, a communication pipe provided in the female mold, and a holding member provided in the communication pipe. (B) In the female mold, a main molding portion for molding a main molded product by adhering a thermoplastic resin powder to the inner wall in a molten state or a semi-molten state is formed, and one side has a powder inlet for charging the thermoplastic resin powder. Being formed. (C) The female mold is provided with a communication pipe communicating with the female powder inlet. (D) A holding member for holding the female mold is provided around the opening of the communication pipe. (E) The female mold is formed so that it can be divided into a plurality.

[0013] A method for manufacturing a powder molded product according to the third aspect of the present invention includes the following steps in order to solve the third problem. (A) After heating the molding die into a molding die composed of a female mold and a communication pipe provided on the periphery of the female powder input port, the thermoplastic resin powder is put through the communication pipe opening, or After putting the thermoplastic resin powder from the opening, the molding die is heated, a hollow main molded product having an opening is formed by a female mold having a powder input port, and the periphery of the opening of the main molded product is formed by a communication pipe. A molding process for molding a communication tube molded product. (B) A cooling step of cooling the heated molding die. (C) A take-out step of taking out the communication tube molded product and the main molded product from the communication tube opening of the molding die. (D) A cutting step of cutting the communicating tube molded product taken out of the molding die to form a sub-molded product serving as a lid. (E) a step of closing the opening of the main molded product with the sub-molded product formed by the cutting step and bonding or welding the sub-molded product to the main molded product.

The powder molded product according to the invention of claim 4 is:
In order to solve the fourth problem, the following configuration is provided. (A) It is composed of a hollow main molded product having an opening and a sub-molded product closing the opening, and is integrally formed by powder molding. (B) The main molded product is molded by a female mold having a powder inlet. (C) The auxiliary molded product is formed by cutting a communication tube molded product formed on the periphery of the opening of the main molded product by a communication tube provided around the female powder inlet. (D) The sub-molded product is bonded or welded to the main molded product so as to close the opening of the main molded product.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a molding die for powder molding according to the present invention will be described with reference to FIGS. A molding die 1 for powder molding includes a female mold 3, a communication pipe 7 provided in the female mold 3, and a holding member 1 provided in the communication pipe 7.
1 and 1. The female mold 3 is formed with a main molding portion 4 for forming a main molded product 41 by adhering a thermoplastic resin powder to the inner wall in a molten state or a semi-molten state, and has a powder inlet 5 on one side for charging the thermoplastic resin powder. Are formed.

The female mold 3 is provided with a communication pipe 7 communicating with the powder input port 5 of the female mold 3. A holding member 11 for holding the female mold 3 is provided on the periphery of the opening 9 of the communication pipe 7. The holding member 11 is for stably holding the female mold 3 and is not limited to a flat plate. On the inner wall of the communication pipe 7, a sub-molding part 10 for molding a sub-molded article 45 covering the opening 42 of the main molded article 41 that cannot be molded by the powder inlet 5 of the female mold 3 is formed.

An embodiment of the method for manufacturing a powder molded product according to the third aspect of the present invention using the molding die 1 will be described with reference to FIGS. Holding member 11 of molding die 1
And the female mold 3 is fixed at a predetermined position. The female mold 3 and the communication pipe 7 are heated by various heating means such as hot air or an electric heater. In this case, as shown in FIG. 3, when hot air is blown from the opening 9 of the communication pipe 7 toward the inside of the female mold 3, the female mold 3 and the inside of the communication pipe 7 are heated simultaneously.

As shown in FIG. 5, when the thermoplastic resin powder 23 is put into the female mold 3 and the communication pipe 7 from the opening 9 of the communication pipe 7, the thermoplastic resin powder 23 is melted or semi-molten. Then, the resin adheres to the communication pipe 7 and the inner wall of the female mold 3 to form a resin melted layer 27 as shown in FIG. The thermoplastic resin powder 23 may be put into the female mold 3 and the communication pipe 7 first, and the female mold 3 and the communication pipe 7 may be heated later. .

Thermoplastic resin powder 23 not adhered to inner wall
Is discharged from the female mold 3 through the powder input port 5, the communication pipe 7, and the open port 9 (see FIG. 6). The discharging operation of the thermoplastic resin powder 23 is performed by the opening 42 of the main molding 41 as described later.
Can be carried out at any time as long as is not blocked by the sub-mold 45. As shown in FIG. 7, the female mold 3 and the communication pipe 7 are
When cooled by various cooling means such as water cooling and air cooling, the resin molten layer 27 adhered to the female mold 3 and the inner wall of the communication pipe 7 is hardened, and the main molded part 41 is molded by the female main molded part 4, The communication pipe 7 forms a communication pipe molded product 43 (see FIG. 8). The communication tube molded product 43 and the main molded product 41 are taken out from the communication tube 7 opening 9 of the molding die 1. Main molded product 4
As shown in FIGS. 8 and 10, 1 has an opening 42 on one side, and the opening 42 is surrounded by a communicating pipe molding 43.

On the inner wall of the communication pipe 7, a powder inlet 5 for the female mold 3 is provided.
Since the sub-molding portion 10 for forming the sub-molding 45 covering the opening 42 of the main molding 41 which cannot be molded by the molding is formed, the communicating tube molding 43 has the sub-molding 45
It is included.

When the portion of the communicating pipe 43 except for the sub-mold 45 is cut and removed, the sub-mold 45 is connected to the main mold 41 so as to be openable and closable, as shown in FIGS. State. The invention according to claim 4, as shown in FIGS. 11 and 12, wherein the sub-molded article 45 is closed so as to close the opening 42, and the periphery of the sub-molded article 45 is adhered to the main molded article 41 by welding or an adhesive. Is manufactured. In addition, the sub-molded article 45 is molded separately from the main molded article 41, and after the sub-molded article 45 and the main molded article 41 are completely cut off, they are bonded by welding or an adhesive in the same manner as described above. A hollow powder molded product 40 may be formed.

In the above embodiment, the sub-molded portion 10 is formed on one side of the inner wall of the communication pipe 7, but as shown in FIG.
Of course, it can be formed on both sides or the entirety of the inner wall of the communication pipe 7.

An embodiment of a molding die for powder molding according to claim 2 will be described with reference to FIGS. The molding die 2 for powder molding comprises a female die 3, a communication pipe 7 provided on the female die 3, and a holding member 11 provided on the communication pipe 7, similarly to the molding die 1. Have been. The female mold 3 has a main molding portion 4 for molding a main molded product by adhering a thermoplastic resin powder to the inner wall in a molten state or a semi-molten state, and has a powder inlet 5 on one side for charging the thermoplastic resin powder. Is formed. The female mold 3 is provided with a communication pipe 7 communicating with the powder inlet 5 of the female mold 3. A holding member 11 for holding the female mold 3 is provided on the periphery of the opening 9 of the communication pipe 7.
The female mold 3 is formed so as to be dividable into a plurality.

That is, the female mold 3 is composed of a female main body 6 having a powder inlet 5 and an attached female mold 8. The female body 6 and the attached female mold 8 are detachably attached so that the opening 6a of the female body 6 and the opening 8a of the attached female mold 8 are joined. Various attachment methods are conceivable. Therefore, if the attached female die 8 is removed from the female main body 6, the female main body 6
Can be used to clean the inside of the female body 6 or apply a release agent by inserting a brush or the like through the open port 9 of the communication pipe and the open port 6a of the female body 6. Similarly, the accessory female mold 8 can be cleaned with a brush or the like from the opening 8a, or the inside of the accessory female mold 8 can be coated with a release agent or the like.

Conventionally, the attached female die 8 is formed integrally with the female die body 6, and the brush inserted through the opening 9 of the communication pipe 7 cannot reach the end of the attached female die 8. Therefore, when the thermoplastic resin sticks to the end, it cannot be removed, so that the entire molding die 1 cannot be used. However, the molding die 2 for powder molding according to claim 2
Since the attached female mold 8 can be removed, the entire inside can be easily cleaned as described above, and therefore, can be used for a long time. In addition, since the attached female mold 8 can be detachably detached, it can be easily replaced when it is damaged or when it is desired to partially change the shape of the powder molded product. Note that the number of divisions of the female mold 3 can be determined in consideration of the shape of the female mold 3, and there is no need to limit the number to two.

[0026]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of the present invention will be described below with reference to the drawings. Reference numeral 1 shown in FIGS. 1 and 2 is a molding die for powder molding. The molding die 1 includes a dinosaur-shaped female mold 3, a communication pipe 7 provided on the female mold 3, and an iron flat holding member 11 provided on the communication pipe 7.

The female mold 3 is made by attaching a thermoplastic resin powder to the inner wall of the female mold 3 in a molten state or a semi-molten state to form a main molded product 41.
Is formed, and on one side thereof, a powder inlet 5 for charging a thermoplastic resin powder is formed.

The female mold 3 is provided with a communication pipe 7 communicating with the powder inlet 5 of the female mold 3. That is, the communication pipe 7
The female mold 3 is formed integrally with the female mold 3 so as to surround the powder inlet 5 formed on the upper part (the back of the dinosaur).

At the periphery of the opening 9 of the communication pipe 7, a female mold 3
A flat holding member 11 for holding the plate is integrally attached. The holding member 11 has a plurality of holes 13.
(Blower). The holding member 11 is
This is for stably holding the female mold 3 and is not limited to a flat plate shape. On the inner wall of the communication pipe 7, a sub-molding part 10 for molding a sub-molded article 45 covering the opening 42 of the main molded article 41 that cannot be molded by the powder inlet 5 of the female mold 3 is formed.

In the molding die 1, the female die 3 and the communication pipe 7 are integrally formed, and the communication pipe 7 is provided with a holding member 11 formed separately.
Was formed by welding such as welding. But,
The female mold 3, the communication pipe 7, and the holding member 11 may be formed separately, and each may be formed by welding or the like.

A method for producing a powder molded product using the molding die 1 will be described. When the holding member 11 of the molding die 1 is attached to a transport frame 17 of a known powder slush molding device by a bolt or the like, the molding die 1 is transported to a heating unit, a powdering unit, a water cooling unit, and a demolding unit. Is done. This will be described more specifically. As shown in FIG. 3, when the holding member 11 of the molding die 1 is attached to the transfer frame 17 with the female mold 3 facing upward and the powder inlet 5 facing downward, the transfer frame 17 transfers the holding member 11 to the heating unit. .

In the heating section, the molding die 1 is heated by hot air blown upward from below. That is, hot air passes through the opening 9 of the communication pipe 7 and
Then, the inner wall of the female mold 3 is heated. At the same time, hot air is
The outside of the communication tube 7 and the female mold 3 is heated through the one hole 13.

The molding die 1 heated by the heating unit is transferred to the powdering unit by the transfer frame 17, and the powder box 21 is joined to the holding member 11 as shown in FIG. The powder box 21 is filled with a thermoplastic resin powder 23. An opening 25 is formed in the upper part of the powder box 21 so as to be joined to the opening 9 of the communication pipe 7. In this state, the molding die 1 is rotated. The rotation angle, the number of rotations, and the like are freely set based on the structure of the female mold 3.

The thermoplastic resin powder 23 in the powder box 21 enters the communication pipe 7 and the female mold 3 through the opening 25 as shown in FIG. Since the inner wall of the communication pipe 7 and the female mold 3 is heated, the thermoplastic resin powder 23 adheres to the inner wall of the communication pipe 7 and the female mold 3 in a molten state or a semi-molten state, and
A resin melt layer 27 of about 3 mm is formed. As shown in FIG. 6, when the female mold 3 is turned upward and the opening 9 is turned downward and the rotation is stopped, the thermoplastic resin powder 23 that has not adhered to the female mold 3 and the inner wall of the communication pipe 7 is transferred to the powder box 21. Collected.

The powder box 21 is separated from the molding die 1, and the molding die 1 is transported by the transport frame 17 to the water cooling section. The transfer frame 17 is fixed to the rotary frame 29 by a clamp or the like, and the rotary frame 29 rotates the molding die 1 by about 180 degrees, and the female die 3 is positioned below. A heat-resistant silicone gasket 31 is provided on the lower surface of the rotating frame 29 as a plate for preventing water leakage.
The packing 31 closes the plurality of holes 13 of the holding member 11 in a watertight manner.

The water sucked up by the pump 35 from the water tank 33 is jetted out by the jetting pipe 37, and is sprayed on the female mold 3 and the communication pipe 7 to be cooled. The resin melted layer 27 attached to the female mold 3 and the inner wall of the communication pipe 7 is hardened,
Is formed. The rotating frame 29 is separated from the transport frame 17, and the molding die 1 is transported by the transport frame 17 to the demolding section. In the demolding portion, the powder mold 40 in the female mold 3 and the communication pipe 7 is taken out from the opening 9 of the communication pipe 7.

As shown in FIG. 8, the powder molded product 40 is formed by a hollow main molded product 41 formed by the main molding portion 4 of the female die 3 and a cylindrical communication tube molded by the communication tube 7. Object 43. The main molded product 41 is formed in a dinosaur shape by the female mold 3, and an opening 42 is formed in the back by the powder inlet 5 of the female mold 3. The communicating pipe molded article 43 is formed so as to surround the opening 42 so as to surround the main molded article 41.
It is united with.

The inner wall of the communication pipe 7 has a powder inlet 5 for the female mold 3.
Since the sub-molding portion 10 for forming the sub-molding 45 covering the opening 42 of the main molding 41 which cannot be molded by the molding is formed, the communicating tube molding 43 has the sub-molding 45
It is included. Since the sub-molded article 45 is for closing the back opening 42 of the main molded article 41 formed in a dinosaur shape, the sub-molded article 45 is formed in a back shape having a raised portion.

When the portion excluding the sub-molded product 45 of the communicating pipe molded product 43 is cut and removed, the sub-molded product 45 is opened and closed on the back of the main molded product 41 as shown in FIGS. It will be in the connected state. Insert the sub-molded article 45 into the back opening 4
When the peripheral edge of the sub-molded article 45 is welded or adhered to the main molded article 41 with an adhesive or the like, a dinosaur-shaped animal toy (powder molded article 40) is manufactured as shown in FIG. You. In addition, the sub-molded article 45 is molded separately from the main molded article 41, and after the sub-molded article 45 and the main molded article 41 are completely cut off, they are bonded by welding or an adhesive in the same manner as described above. An animal toy (a powder molded product 40) may be formed.

In the above embodiment, the communication pipe 7 is a female mold 3
Has the function of separating the hot air from the source of hot air. That is, since it is necessary to heat the entire female mold 3 to the melting temperature of the thermoplastic resin powder, the portion farthest from the hot air jetting source is heated to the minimum required temperature. It is sprayed on the closest part from the source. Therefore, if there is no communication pipe 7, the powder inlet 5 closest to the source of hot air is heated more than necessary, and the thermoplastic resin powder near the powder inlet 5 is scorched, resulting in poor molding of the powder molded product. Sometimes. However, the female die 3 is separated from the hot air jetting source by the communication pipe 7, and the opening 9 of the communication pipe 7 is closest to the hot air jetting source. Burning will cause molding failure of the powder molded product. Since the molded product in the vicinity of the opening 9 is cut off as described above, there is no problem even if it is scorched.

In the above embodiment, the sub-molding part 10 is connected to the communication pipe 7.
Although it is formed on one side of the inner wall, as a matter of course, it can be formed on both sides or the entirety of the inner wall of the communication pipe 7 as shown in FIG. In the above embodiment, the female mold 3 and the communication pipe 7 are heated first, and then the thermoplastic resin powder is filled. However, the female mold 3 and the communication pipe 7 are filled with the thermoplastic resin powder. The female mold 3 and the communication pipe 7 may be heated. Furthermore, in the above embodiment, the molding die 1 is automatically heated or the like using a known powder slush molding device. However, it is needless to say that the molding die 1 can be manually performed. Without being limited to hot air, it may be a simple electric heater or the like.

Another embodiment of a molding die for powder molding will be described with reference to FIGS. The part of the molding die 2 for powder molding other than the female die 3 is the same as the molding die 1, and the description is omitted. The female mold 3 is formed so as to be dividable into a plurality. That is, the female mold 3 includes a female main body 6 having a powder input port 5 and an attached female mold 8. A flange 6b is provided around the opening 6a of the female main body 6, and a flange 8b is provided around the opening 8a of the attached female die 8. The female mold body 6 and the attached female mold 8 are provided with these open ports 6a,
The flanges 6b and 8b are joined so as to communicate with each other, and the flanges 6b and 8b are integrally connected by fixing them with fastening means such as bolts. Therefore,
If the fastening means such as bolts is removed, the attached female mold 8 becomes
Can be easily removed from.

[0043]

According to the first aspect of the present invention, there is provided a molding die for powder molding and a method of manufacturing a powder molded product according to the third aspect, wherein a main molded product is molded by a female mold and a sub molded product is molded by a communication pipe. be able to. That is, two moldings can be molded simultaneously with one molding die, and there is an effect that molding efficiency can be increased. Further, the sub-molded product can be a lid that covers the opening of the main molded product that has not been molded by the female powder inlet. Since the sub-molded article and the main molded article are molded at the same time, the color, the thickness and the like become substantially the same, and even if the sub-molded article is attached to the main molded article as a lid, there is an effect that there is no unnatural feeling.

The molding die for powder molding according to claim 2 is
Since the female mold is formed to be divisible, split the female mold,
The fine part of the female mold, which could not be done with the conventional female mold, can be cleaned or internally treated, and has the effect that it can be used for a long time. In addition, since split assembly is possible, when a part is broken or when it is desired to partially change the shape of the powder molded product, it is possible to easily replace the powder molded product.

According to the fourth aspect of the present invention, the thermoplastic resin powder remaining inside can be easily removed from the opening, and further, a filler or a driving device can be incorporated into the inside. A puppet animal that can be closed with a sub-molded product having almost the same color and thickness as the molded product, so that the appearance of the opening is completely unknown from the external appearance, increasing the commercial value, and having a tactile feel and elasticity close to the real thing There is an effect that it can be used as the skin of the toy.

[Brief description of the drawings]

FIG. 1 is a perspective view showing one embodiment of a molding die according to the present invention.

FIG. 2 is a side sectional view of FIG.

FIG. 3 is a side view showing a heating step of a molding die.

FIG. 4 is a side sectional view of a molding die before filling with a thermoplastic resin powder.

FIG. 5 is a side sectional view of a molding die showing a step of filling a thermoplastic resin powder.

FIG. 6 is a side sectional view of a molding die showing a step of discharging a thermoplastic resin powder.

FIG. 7 is a side view of a molding die showing a cooling step.

FIG. 8 is a perspective view of a powder molded product immediately after being removed from a molding die.

FIG. 9 is a perspective view of a powder molded product after a part is cut in a cutting step.

FIG. 10 is a rear view of the powder compact of FIG. 9;

FIG. 11 is a rear view of the powder molded product after the bonding step.

FIG. 12 is a perspective view of FIG. 11;

FIG. 13 is a front view of a molding die according to another embodiment.

FIG. 14 is a perspective view of a molding die according to another embodiment.

FIG. 15 is a side sectional view of FIG. 14;

FIG. 16 is a sectional view showing a conventional technique.

FIG. 17 is a perspective view of a molding of the prior art.

FIG. 18 is a cross-sectional view showing a conventional technique.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Molding die 2 Molding die 3 Female mold 4 Main molding part 5 Powder input port 6 Female main body 6a Opening port 6b Flange 7 Communication pipe 8 Attached female mold 8a Opening port 8b Flange 9 Opening port 10 Secondary forming section 11 Holding member 13 Hole 17 Conveying Frame 21 Powder Box 23 Thermoplastic Resin Powder 25 Opening 27 Resin Melting Layer 29 Rotating Frame 31 Packing 33 Water Tank 35 Pump 37 Ejection Tube 40 Powder Molding 41 Main Molding 42 Opening 43 Communication Tube Molding 45 Secondary Molding

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ identification code FI B29L 31:52 (58) Fields investigated (Int.Cl. ⁶ , DB name) A63H 9/00 B29C 41/18 B29C 41/40

Claims (4)

(57) [Claims] 1. A molding die for powder molding having the following requirements. (A) A female mold, a communication pipe provided in the female mold, and a holding member provided in the communication pipe. (B) In the female mold, a main molding portion for molding a main molded product by adhering a thermoplastic resin powder to the inner wall in a molten state or a semi-molten state is formed, and one side has a powder inlet for charging the thermoplastic resin powder. Being formed. (C) The female mold is provided with a communication pipe communicating with the female powder inlet. (D) A holding member for holding the female mold is provided around the opening of the communication pipe. (E) A thermoplastic resin powder is adhered to the inner wall of the communication pipe in a molten state or a semi-molten state, and a sub-molding material covering the opening of the main molding which cannot be molded by the female powder inlet is formed. The sub-molding part to be molded must be formed. 2. A molding die for powder molding having the following requirements. (A) A female mold, a communication pipe provided in the female mold, and a holding member provided in the communication pipe. (B) In the female mold, a main molding portion for molding a main molded product by adhering a thermoplastic resin powder to the inner wall in a molten state or a semi-molten state is formed, and one side has a powder inlet for charging the thermoplastic resin powder. Being formed. (C) The female mold is provided with a communication pipe communicating with the female powder inlet. (D) A holding member for holding the female mold is provided around the opening of the communication pipe. (E) The female mold is formed so that it can be divided into a plurality. 3. A method for producing a powder molded product comprising the following steps. (A) After heating the molding die into a molding die composed of a female mold and a communication pipe provided on the periphery of the female powder input port, the thermoplastic resin powder is put through the communication pipe opening, or After putting the thermoplastic resin powder from the opening, the molding die is heated, a hollow main molded product having an opening is formed by a female mold having a powder input port, and the periphery of the opening of the main molded product is formed by a communication pipe. A molding process for molding a communication tube molded product. (B) A cooling step of cooling the heated molding die. (C) A take-out step of taking out the communication tube molded product and the main molded product from the communication tube opening of the molding die. (D) A cutting step of cutting the communicating tube molded product taken out of the molding die to form a sub-molded product serving as a lid. (E) a step of closing the opening of the main molded product with the sub-molded product formed by the cutting step and bonding or welding the sub-molded product to the main molded product. 4. A powder molded product having the following requirements. (A) It is composed of a hollow main molded product having an opening and a sub-molded product closing the opening, and is integrally formed by powder molding. (B) The main molded product is molded by a female mold having a powder inlet. (C) The auxiliary molded product is formed by cutting a communication tube molded product formed on the periphery of the opening of the main molded product by a communication tube provided around the female powder inlet. (D) The sub-molded product is bonded or welded to the main molded product so as to close the opening of the main molded product.