JP3008827B2 - Molded products, molding methods and molding equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a television receiver (T).
V) The present invention relates to an injection molding method and an injection molding apparatus for a molded product constituting a housing (cabinet) of various electronic devices such as V). The present invention relates to a method and an injection molding apparatus for applying a film such as a member or a character or a figure in an injection molding process.

[0002]

2. Description of the Related Art In recent years, as a structure of a TV set or the like such as a set base or a housing of an electronic device, a hollow structural member having a plurality of independent hollow portions or hollow portions of a predetermined shape communicating with each other is frequently used. ing.

The hollow structural member is formed by gas-assisted injection molding of a plastic member. The purpose is to reduce molding costs, reduce the weight of molded products, improve quality, and perform low-pressure molding.

[0004] Examples of the hollow structural member and its molding method and molding apparatus are disclosed in JP-A-5-293844, JP-B-57-14968, JP-B-59-49902, JP-B-61-53208 and JP-B-61-53208. 61-5
JP-A-9899, JP-A-1-28690, JP-A-2-87880, JP-A-3-242124 and the like have been proposed. As an example, FIG. 9 shows a conceptual diagram of the process of hollow molding.

Means for arranging an electromagnetic wave shielding member on the inner surface of the hollow portion of a molded product is disclosed in, for example, Japanese Patent Application Laid-Open No. 5-25968.
No. 2 is proposed. In this case, after the molding resin is cooled and solidified, the conductive paint is injected into the hollow portion.

[0006]

Although the above-mentioned hollow structural member aims at improving the quality and physical strength and reducing the weight as described above, it does not always have an electromagnetic wave shielding function.

The electromagnetic wave shielding function is generally applied to a surface of an empty casing or a hollow structural member by applying a conductive paint to a predetermined thickness, depositing a thin film made of a metal member to a predetermined thickness, plating, or the like. It is mounted by means such as sputtering, or by attaching a thin metal plate.

When various structural members are formed by injection molding a resin member, means for mixing a conductive member (conductive filler) into the resin member to be used is also used.

However, the configuration and processing means of the conventional electromagnetic wave shield cannot sufficiently cope with the variety of designs of a housing or the like constituting an electronic device. Alternatively, there has been a problem that processing man-hours are required and the cost cannot be reduced.

When a conductive filler is mixed into a resin member, the moldability of the resin member may be reduced. For example, the fluidity of the resin may be reduced, or the surface quality state of the molded product may be deteriorated.

In Japanese Patent Application Laid-Open No. 5-259682, since the electromagnetic wave shielding member is provided on the inner surface of the hollow portion, some grounding measures are required. Further, it is difficult to dispose an electromagnetic wave shielding member in an arbitrary partial area.

According to the present invention, one or a plurality of independent hollow portions are provided inside a member such as a housing, and a part of the surface of the molded product or almost the entire region on one side (entire surface) is provided.
An object of the present invention is to provide a hollow structural member having a coating layer having an electromagnetic wave shielding function or the like simply and inexpensively by applying an electromagnetic wave shielding member or a coating layer such as a character or a figure in an injection molding process. Furthermore, a coating layer such as an electromagnetic wave shielding function member or a character or a figure can be easily applied to a part of the surface of the molded product constituting the empty general structural member or almost the entire region (entire surface) on one side in the injection molding process. The purpose is to do.

[0013]

In order to solve the above-mentioned problems, the present invention provides a method for injection-molding a molded article having no void or a hollow portion. After injecting the resin into the mold, the entire mold or the partial area of the mold on one side constituting the one surface is retracted by a predetermined amount to provide a gap, and a conductive member or a magnetic member or paint is provided in the gap. By injecting any one of a member or a resin member different from the injected resin or a resin member or a fiber member of a different color from the injected resin, an optical film forming member, an antibacterial member or a photocatalyst, at least one of the molded articles is formed. The coating layer is formed in the region of the part.

Further, in forming the coating layer on at least a part of the region, a conductive member, a magnetic member, a paint member, a resin member different from the injected resin, a resin member or a fiber member different in color from the injected resin, or The coating layer is formed by injecting or injecting a gas containing any one of an optical film forming member, an antibacterial member, and a photocatalyst.

[0015] Further, the paint member is a conductive paint in addition to a general paint. The film forming member to be injected into the gap may be injected in any state of liquid, solid, and gas. For example, it may be supplied in a form in which a conductive member is mixed into a high-pressure gas body.

Further, the timing of injecting the film forming member into the inner surface of the gap is arbitrarily performed. For example, when a high-pressure gas containing a powdery, fibrous, particulate, or flake-like conductive filler is injected, the injection is performed before the resin in the mold cavity is cooled and solidified. Naturally, after the resin is cooled and solidified, a high-pressure gas containing the film forming member may be injected. In this case, a binder, an adhesive resin, a diluting solvent, and the like may be included in the high-pressure gas so that the film-forming member does not peel off from the adhesion surface.

In the case where the high-pressure gas containing the film-forming member does not contain the binder, the adhesive resin or the diluting solvent,
After the injection, the retreated mold may be advanced again to press the coating surface of the film-forming member, and the film-forming member may be buried in the surface of the molded article or in the vicinity of the surface.

In the case of a general paint or a conductive paint, it is desirable to perform the injection after the resin is solidified.

Needless to say, the number of nozzles for injecting the film forming member is not limited to one, but may be arbitrarily set at a plurality of locations. Needless to say, any member may be used as the conductive member.

Further, the conductive paint may be any solvent such as alcohol, toluene, thinner, acetone, epoxy resin, acrylic resin, vinyl chloride resin, ABS resin, PS resin, polyamide resin, polycarbonate resin in addition to conductive filler. The same applies to a case where a predetermined amount of an arbitrary resin member such as a thermoplastic resin such as styrene or a styrene resin may be contained.

As the conductive filler contained in the conductive member or the conductive paint, silver, copper, brass, iron, zinc, AL, Ni, stainless steel, carbon or the like, or any combination thereof, It is carried out in any form such as powder, fiber, particle or flake. For example, the size and shape suitable for being contained in the high-pressure gas may be different from the size and shape suitable for being contained in the conductive paint.

Further, a magnetic member may be used instead of the conductive member. When the electromagnetic wave shielding member is made of a metal member, the electromagnetic wave is reflected. On the other hand, when a gas containing ferrite powder, which is a modification of ceramics, is injected to the inner surface of the void, or the ferrite powder is mixed with a binder, a solvent, a resin member, or the like and applied to the inner surface of the void. In such a case, the electromagnetic wave is absorbed and becomes heat energy, and is attenuated or eliminated. As a magnetic member other than ferrite, a magnetic metal such as silicon, iron, nickel, and cobalt may be powdered or fibrous, or a soft magnetic alloy such as iron-silicon, iron-nickel, iron-cobalt, and iron-aluminum may be powdered. Alternatively, it is arbitrary such as a fiber.

Further, it may be arbitrarily implemented as an injection-moldable member constituting a molded product. For example, ABS or P
Powder of a resin member such as S, PP, PMMA, PE or PET, a rubber member such as silicon, butyl or fluorine, or a ceramic member such as forsterite, alumina or silicon nitride can be arbitrarily selected from water, PVA, alcohol or toluene. A member kneaded with a solvent, an organic binder, a surfactant, a thickener, and the like may be used.

Further, a biodegradable plastic may be used. For example, a denatured protein material such as gluten, a material obtained by kneading paper and denatured protein, an agar material, a material obtained by kneading potato starch with water, a natural polymer Novamont (trade name: Materby / Nippon Synthetic Chemical Industry), a microorganism-producing material Polyester-based ICI (trade name: Biopol / ICI Japan), chemically synthesized aliphatic polyester (trade name: Bionole / Showa Kobunshi), and the like may be used arbitrarily.

Further, in addition to the above, glass fiber or carbon fiber may be injected and buried as the coating forming member to increase the rigidity of the molded product, or the decorative function may be provided by clothing fibers or the like. .

[0026]

According to the present invention, the characteristics of the resin member used for the injection molding are not changed by the above-described structure. For example, without changing the molding characteristics of the resin member, an arbitrary structure or a curved surface shape can be configured according to the variety of designs and the purpose of use. Of course, the quality of the molded product does not deteriorate.

Further, a coating layer such as an electromagnetic wave shielding member can be formed only on any desired area of the resin molded product.

Further, a coating layer can be formed in the process of injection molding, so that an operation for forming an electromagnetic wave shielding member is not required. Therefore, the process can be simplified and the cost can be reduced.

[0029]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to FIGS. 1 to 8 using an example of injection molding of a resin molded product.

(Example 1) This example relates to an injection molding method of a molded product having an uneven thickness structure having a hollow portion therein.

FIG. 1 is a cross-sectional view of a main part showing the concept of an injection molding method according to a first embodiment of the present invention. FIG. 2 is a cross-sectional view of a main part in a state where a movable portion advances and a recess is formed after resin is injected. FIG. 3 is a sectional view of a main part in a state where the movable portion of FIG. 2 is retracted to form a gap, and FIG. 4 is an external perspective view of a molded product. The mold 1 is a pair of a fixed mold 2 and a movable mold 3 and has a cavity 4 at a parting line. A gate 5 and a sprue 6 are provided at substantially the center of the movable mold 3 which forms one surface of the cavity 4.
5 and a gas injection nozzle (gas injection port) 16 to an injection device 13 and a gas injection device 14, respectively.

A movable portion 7 is provided in a part of the fixed mold 2 which constitutes the other surface of the cavity 4 facing the gate 5. The movable part 7 is connected to a hydraulic cylinder 10 via a piston rod 8 slidably penetrating the fixed mold 2, and is configured to be able to advance and retreat to the cavity 4. Further, a stopper 9 is provided at an intermediate portion of the piston rod 8, and abuts against a concave portion 20 provided in the fixed mold 2. As a result, the movable section 7 does not advance beyond a certain limit. That is, the top dead center of the movable part 7 is determined.

The thin part 17 (recess) of the final molded product is provided in a part of the cavity 4 where the movable part 7 advances.
Is formed, and the thick portion 18 is formed in other regions.
Is formed.

The hydraulic control device 1 for the hydraulic cylinder 10
1 is connected to the injection control device 12 so as to control the movable portion 7. The injection control device 12 also controls the injection device 13 and the gas injection device 14.

Further, a coating injection nozzle 4 is provided from the stationary mold 2 side.
0 is provided so as to be capable of injecting the film forming member into the cavity 4 through the movable portion 7,
1 is controlled.

Next, a method of injection molding a molded article using the above molding apparatus will be described. In addition, as a resin member described below, PS (polystyrene) is used, and the thin portion 1 is used.
7 has a thickness of 2.5 mm, and the thick portion 18 has a thickness of 5.5.
The mold 1 was used to form an uneven thickness hollow molded product as shown in FIG. 4 having a plane dimension of 250 mm × 300 mm.

First, the movable portion 7 is retracted by the hydraulic control device 11 or the like. In this case, it is desirable that the gap A of the cavity 4 when injecting the resin is at least 3 mm or more. If it is less than that, it is difficult to form a hollow structure through which gas can pass. In the embodiment shown in FIG. 1, the dimension A was 4 mm.

Then, the molten resin is injected into the cavity 4 from the resin injection nozzle 15 by the injection device 13 or the like in a state where the movable portion 7 is retracted, and after a delay time of 0.5 second, 200 kg / cm ² . Nitrogen gas was injected into the cavity 4 to form a hollow portion, and at the same time, the movable portion 7 was advanced to form a thin portion 17 having a thickness of 2.5 mm. (See FIGS. 2 and 4).

In this case, the injection control device 12 takes out an electric signal of the gas injection device 14, sends a signal to the hydraulic control device 11 with a delay time, activates the hydraulic cylinder 10, and moves the movable portion 7 forward. Used.

After a lapse of a predetermined time, the movable section 7 is retracted to form a gap 19. Thereafter, before the injected resin is solidified, a high-pressure gas containing a film-forming member, such as a conductive member (conductive filler), is passed through the film-injection nozzle 40 based on a command from the film-forming member injection device 41 in the space 19. Inject.

That is, while the resin has some viscosity, a conductive filler such as a metal powder is sprayed and adhered to form a coating layer having a thickness of several tens of micrometers to several hundreds of micrometers. What is necessary is just to set the thickness dimension of a coating layer to the desired retreat amount G of the movable part 7 after forming a thin part.

In the above embodiment, the example in which the film-forming member is sprayed before the injected resin is solidified has been described.
Even after the resin is solidified, the film-forming member may be sprayed or injected. In this case, it is desirable to previously mix the adhesive member with the film forming member. Of course, the film forming member may be a conductive paint or the like. As a matter of course, in the case of injecting an adhesive or a paint, after the coating layer is dried and cured, the mold is opened and the molded product is taken out.

Further, when the film-forming member made of powder is injected and injected after the molding resin is solidified, the following process may be added. That is, after forming the coating layer by injecting the coating forming member, the movable portion 7 is again advanced to press the coating layer adhered to the concave surface of the molded product so as to be embedded in the resin surface or in the vicinity of the surface. Good.

Further, the film forming member may be injected during the process of retracting the movable portion 7 to form the gap.

(Embodiment 2) FIGS. 5 and 6 show a second embodiment of the present invention, and relate to an injection molding method for a molded article 51 having no or a hollow portion. In the present embodiment, description will be made on the assumption that an empty molded product is used.

FIG. 5 is a cross-sectional view of a main part showing the concept of an injection molding method according to a second embodiment of the present invention. FIG. 6 is a main part showing a state in which a movable portion is retracted to form a gap after resin is injected. FIG. In the case of this embodiment, the process of forming the voids is different from that of the first embodiment, and the basic configuration such as the configuration of the mold and the injection of the resin member and the film forming member is the same as that of the first embodiment.
Is the same as

That is, a mold 105 having a movable portion 7A which can freely advance and retreat is provided in at least a part of the cavity, and a molten resin is injected into the cavity while the movable portion 7A is advanced to provide a concave portion. Then, the movable portion 7A is retracted to form a gap 52, and a film of any one of a conductive member, a magnetic member, a paint member, and a fiber member is formed in the gap 52. A film layer is formed in the recess by injecting a member.

As described above, when forming the coating layer in the concave portion, a conductive member, a magnetic member, a paint member, a resin member different from the injected resin, or a resin member or a fiber member different in color from the injected resin. As in the case of the first embodiment, the coating layer may be formed by injecting a gas containing any one of the members, or a paint or a conductive paint may be injected.

The same applies to the case where the conductive member is a conductive filler of any one or any combination of silver, copper, brass, iron, zinc, AL, Ni, stainless steel, and carbon. Also,
The same applies to the case where the magnetic member is made of ferrite powder.

In the second embodiment, the advance amount δ of the movable portion 7A
Is from tens of micrometers to hundreds of micrometers,
When the injected film-forming member is injected into the recess, it is configured to be substantially flush with the surface of the molded article.

(Embodiment 3) FIGS. 7 and 8 show a third embodiment of the present invention, and relate to an injection molding method of a molded article 71 having no or hollow portions. In the present embodiment, description will be made on the assumption that an empty molded product is used.

FIG. 7 is a sectional view showing the concept of an injection molding method according to a third embodiment of the present invention. FIG. 8 is a view showing the essential part in a state where a movable portion is retracted to form a gap after resin is injected. FIG.

As compared with the second embodiment, the third embodiment has the same process for forming the voids, but differs in the portion where the coating layer is provided. That is, the coating layer is provided in a protruding manner on the surface of the molded product.

The basic configuration such as the configuration of the mold and the injection of the resin member and the film forming member is the same as that of the second embodiment.

That is, a mold 107 having a movable portion 7B which can freely advance and retreat in at least a part of the cavity is prepared, and a molten resin is injected into the cavity while the movable portion is advanced, and a concave portion is provided. A molded product 71 is formed, and thereafter, the movable portion 7B is retracted to provide a void 72,
By injecting any one of a film forming member of a conductive member, a magnetic member, a paint member, or a fiber member into the gap portion 72, a film layer is formed on the surface of the molded article 71 in a convex shape. I do.

As described above, in forming the coating layer on the surface of the molded article 71, a conductive member, a magnetic member, a paint member, a resin member different from the injected resin, a resin member different in color from the injected resin, or As in the case of the first embodiment, the coating layer may be formed by injecting a gas containing any one of the fiber members, or a paint or a conductive paint may be injected. It is.

Further, the same applies to the case where the conductive member is a conductive filler of silver, copper, brass, iron, zinc, AL, Ni, stainless steel, or carbon, or any combination thereof. Also,
The same applies when the magnetic member is made of ferrite powder.

In the third embodiment, the retreat amount of the movable portion 7B is set to several tens of micrometers to several hundreds of micrometers, but it is needless to say that the retreat amount may be set arbitrarily.

Further, the molded article may have any configuration, such as a hollow or hollow part as described above.

(Embodiment 4) FIGS. 10 and 11 show a fourth embodiment of the present invention, and relate to an injection molding method for a molded article 111 having no void or a hollow portion. In the present embodiment, description will be made on the assumption that an empty molded product is used.

FIG. 10 is a sectional view showing the concept of an injection molding method according to a fourth embodiment of the present invention, and FIG. 11 is an external perspective view of a molded product. Also in the case of this embodiment, the basic configuration such as the molding process, the configuration of the mold, the injection of the resin member and the film forming member is the same as that of the second embodiment.

That is, a mold 110 having a movable part 7C which can freely move back and forth is prepared in at least a part of the cavity, and a molten resin is injected into the cavity with the movable part 7C advanced to provide a concave portion. After that, the movable part 7C is retracted to provide a gap (not shown), and any one of a conductive member, a magnetic member, a paint member, and a fiber member is formed in the gap. A film layer is formed in the recess by injecting two film forming members.

As shown in the external perspective view of the molded article in FIG. 11, in this embodiment, the coating layer 130 is continuous with the inner surface and the end surface of a box-shaped cabinet or a bottomed container or an IC (integrated circuit) package. Is formed.

In this embodiment, the draft angle of the mold,
Alternatively, the covering layer 130 is formed by intentionally providing the molded product with an inclined side surface.

(Embodiment 5) FIG. 12 shows a fifth embodiment of the present invention.
1 relates to an injection molding method. Also in the present embodiment, description will be made on the assumption that a blank molded article is used.

FIG. 12 is a sectional view of a main part showing the concept of an injection molding method according to a fifth embodiment of the present invention. In this embodiment, the basic configuration such as the molding process and the injection of the resin member and the film forming member is the same as that of the second embodiment.

The difference from the fourth embodiment is that the configuration of the mold is the same as that of the conventional general configuration, and that at least a part of the cavity is not provided with a movable part which can freely move forward and backward.

That is, a pair of molds 150 having a fixed mold 122 and a movable mold 123 are prepared, and the movable mold 123 is prepared.
Is advanced to a position (top dead center position) where it is fitted to the fixed mold 122 in a predetermined manner. Next, a molten resin is injected into the cavity of the mold 150 to form a molded article 111 having a concave portion.

Thereafter, the movable mold 123 is retracted by a predetermined amount, and a gap (not shown) is provided between the movable mold 123 and the molded product, and a conductive member, a magnetic member, or a paint member is provided in the gap. Alternatively, a film layer is formed in the recess by injecting any one of the film forming members among the fiber members.

As shown in the perspective view of the external appearance of the molded article in FIG. 11, this embodiment is characterized in that a continuous coating layer 130 is formed on the inner surface and the end surface of a box-shaped cabinet or bottomed container. I do.

(Embodiment 6) FIG. 13 shows a sixth embodiment of the present invention.
1 relates to an injection molding method. Also in the present embodiment, description will be made on the assumption that a blank molded article is used.

FIG. 13 is a sectional view showing the concept of the injection molding method according to the sixth embodiment of the present invention. Also in the case of this embodiment, the basic configuration such as the molding process, the configuration of the mold, and the injection of the resin member and the film forming member is the same as that of the fifth embodiment.

The difference from the fourth embodiment is that the film forming member injecting device 41E is arranged in the side direction of the fixed mold 132 (not on the back of the fixed mold 132 or the movable mold 133).

The molded product is a convex lens, and the film formed on the lens surface is an optical film such as a filter film for selecting a specific frequency, a chromatic aberration preventing film, an antireflection film, or the like.
(Chemical vapor method / Chemical vapor deposition)
It is arranged using a method or the like.

The coating may be a dye or the like constituting a color lens. Of course, the lens formed by the present invention is not limited to a convex lens, but may be any shape such as a concave lens or a meniscus lens.

In the first to sixth embodiments, the members that can be injection-molded are not limited to resin members, but may be rubber members or ceramic members as described above. Is also optional.

Further, the movable portion may be provided not only in a partial area but also on the entire fixed side, or may be provided not only on the fixed side but also on the movable side. Of course, it may be arranged on both sides of the fixed side and the movable side.

Further, the cavity forming surface of the mold may be coated with ethylene tetrafluoride (trade name of Teflon / Dupont) or a polyethylene or polyimide resin member to prevent the molding resin or the film forming member from adhering. .

Further, the timing of injecting the film forming member into the void formed by the mold and the molded article may be arbitrarily performed. For example, in the process of forming the void, that is, at least a part of the mold is removed. A film forming member such as a high-pressure gas may be injected while retracting.

Further, it goes without saying that any other member than the above may be constituted as the film forming member. For example, an antimicrobial member may be included in the injected gas.

As the antibacterial member, zeolite, chitosan,
Mugwort, hinoki and the like are used. Zeolite is silver,
By mixing several percent of antibacterial ceramics containing germicidal substances such as copper and zinc into plastics such as polypropylene, the living environment of attached bacteria is cut off.

Chitosan is a natural polysaccharide often contained in crab shells and shrimp shells, and has antibacterial and antifungal properties. The ratio of 0.3% to several% mixed with or applied to the plastic is sufficient, and the particle size is 5%.
Fine powder of less than micron meter.

The mugwort has a tannin contained in the mugwort, which has an antiallergic and antipruritic effect, a chlorophyll (chlorophyll) has a bactericidal and bacteriostatic effect, and a particle size containing an extract of mugwort 0.5 μm to 20 μm. Microcapsules of a micrometer may be applied or mixed.

The hinoki cypress plays a role as a preservative to prevent tropilone contained in the cypress from attracting bacteria, mold, etc., and may be used as microcapsules having a particle size of several micrometers as in other antibacterial members.

Further, fine particles of a photocatalyst consisting of titanium dioxide or a mixture of titanium dioxide and activated carbon are mixed with compressed air, sprayed onto the surface of a molded product in the cavity, adhered to the surface of the molded product, and then pressed. It may be embedded in the surface of the molded article or near the surface. In this case, the surface condition of the molded product is not completely cooled and hardened,
If anything, a state having tackiness is desirable. Alternatively, when the photocatalyst is pressed by a mold constituting the movable portion, it is desirable that the photocatalyst be easily buried (buried) near the surface of the molded product.

Therefore, the timing at which the fine particles of the photocatalyst are injected into the mold is such that a predetermined amount of the resin member is supplied to the cavity, and then the movable portion of the mold is retracted at a timing at which the outer shape of the molded product is determined. Then, it may be performed at an arbitrary timing such as a process of retracting the movable portion or after retracting.

By forming a photocatalyst layer or film on the surface of the molded article, the surface can be prevented from being stained, bacteria on the surface can be killed, and the smell smeared can be removed. In other words, a photocatalyst such as the sun or a fluorescent lamp that receives near-ultraviolet light of 300 nm to 400 nm is activated and oxidizes and decomposes organic substances (acetaldehyde, ammonia, etc.), nitrogen oxides, chlorine compounds, and the like.

The fine particles of the photocatalyst comprising titanium dioxide or a mixture of titanium dioxide and activated carbon to be embedded in the surface of the molded article have an outer shape of 0.03 to 100 μm, and have a predetermined film thickness or degree of dispersion. It is sufficient to spray, press, and bury the molded product to cover the surface of the molded product.

It goes without saying that a mixture of the adhesive and the photocatalyst may be applied to the surface of the molded article.

The structure of the photocatalyst is described in, for example,
No. 5853 has been proposed.

Here, a catalyst carrying a reducing catalytically active component and a photocatalyst carrying an oxidizing catalytically active component are brought into contact with each other, and further, by contacting a water-repellent substance with any of them, a high activity is obtained. It constitutes a simple photocatalyst.

As a specific example, a component having catalytic activity for the reduction reaction of carbon dioxide such as copper and mercury is supported on a conductive carrier such as carbon black. In addition, a component such as silver or platinum having a catalytic activity for oxidizing water is supported on a semiconductor such as titanium dioxide. Then, the two are brought into contact with each other, but recombination of charges is prevented because the active sites are separated. In addition, since the water-repellent substance is brought into contact with any of them, the catalyst floats up and is present in the aqueous solution surface layer to obtain a highly active photocatalyst.

[0093]

As described above, according to the injection molding method of the present invention, the molded article is provided with a predetermined coating layer, for example, a conductive member in an arbitrary area such as a concave portion or a surface of the molded article. The electromagnetic wave shielding function or the graphic or coating film, the optical film, the antibacterial film, or the photocatalytic film can be easily formed at a low cost without any change.

Of course, there is no adverse effect on the molding characteristics of a molded member such as a resin member. Further, since the electromagnetic wave shielding member and the like are integrally formed in the injection molding process, the operation of forming the electromagnetic wave shielding member and the like in a step different from molding is not required.

[Brief description of the drawings]

FIG. 1 is a sectional view of a main part showing a concept of an injection molding method in a first embodiment of the present invention.

FIG. 2 shows an injection molding method of FIG.
Sectional view of the main part in a state where the movable part has advanced to form a concave part

FIG. 3 is a cross-sectional view of a main part in a state where a movable portion in FIG. 2 is retracted to form a gap.

FIG. 4 is an external perspective view of a molded product in the embodiment of FIG.

FIG. 5 is a sectional view of a main part showing the concept of an injection molding method according to a second embodiment of the present invention.

FIG. 6 is a cross-sectional view of a main part in a state where the movable portion in FIG. 5 is retracted to form a gap portion;

FIG. 7 is a sectional view of a main part showing a concept of an injection molding method in a third embodiment of the present invention.

8 is a cross-sectional view of a main part in a state where the movable portion of FIG. 7 is retracted to form a gap portion.

FIG. 9 is a conceptual diagram of the process of hollow molding.

FIG. 10 is a sectional view of a main part showing the concept of an injection molding method according to a fourth embodiment of the present invention.

11 is an external perspective view of a molded product in the embodiment of FIG.

FIG. 12 is a cross-sectional view illustrating a conception of an injection molding method according to a fifth embodiment of the present invention.

FIG. 13 is a sectional view of a principal part showing a concept of an injection molding method in a sixth embodiment of the present invention.

[Explanation of symbols]

1, 105, 107, 110, 150, 160 Mold 2, 2C, 122, 132 Fixed mold 3, 3C, 123, 133 Movable mold 4 Cavity 5 Gate 6 Sprue 7, 7A, 7B, 7C Movable section 8 Piston rod 9 Stopper 10 Cylinder, 124, 134 16 Gas injection nozzle (gas injection port) 17 Thin part 18 Thick part 19, 52, 72 Void part 30, 130 Coating layer 40 Coating nozzle 41, 41A, 41B, 41C, 41D, 41E Film forming member injection device 50, 51, 71, 111, 121, 131 Molded product

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ identification code FI // B29L 31:34 (58) Field of investigation (Int.Cl. ⁷ , DB name) B29C 45/00-45/84 B29C 33 / 00-33/76

Claims (39)

(57) [Claims] 1. A molded product having a concave portion by preparing a mold having a movable portion that can freely advance and retreat in at least a part of a region of a cavity, and supplying a molding material to the cavity while the movable portion is advanced. Forming a coating layer of the member in the concave portion by providing a gap portion by retreating the movable portion and providing a coating forming member in the gap portion. Molding method. 2. A method of forming a coating layer in a concave portion, comprising: a conductive member, a magnetic member, a paint member, an antibacterial member, an optical film forming member, a photocatalyst, a member different in color from the molding material, or a fiber member. 2. The molding method according to claim 1, wherein the coating layer is formed by supplying a gas containing two members. 3. The conductive member is made of silver, copper, brass, iron, zinc, AL, Ni, stainless steel, or carbon. The molding method of the molded article described. 4. The method according to claim 2, wherein the magnetic member is a ferrite powder. 5. The method according to claim 2, wherein the paint member is a conductive paint. 6. A mold having a movable part which is free to advance and retreat in at least a part of the cavity is provided, a molding material is supplied to the cavity with the movable part being retracted, and a gas is supplied to the molding material. After injecting and forming a hollow portion, the movable portion is advanced to form a thin portion in a portion corresponding to the partial area, and then the movable portion is retracted to form a void portion, and a film is formed in the void portion. By supplying components,
A method of molding a molded product, wherein a coating layer of the member is formed on the thin portion. 7. The method for forming a coating layer on a thin portion includes any one of a conductive member, a magnetic member, a paint member, a member having a different color from the molding material, an antibacterial member, a photocatalyst, and a fiber member. 7. The method according to claim 6, wherein the coating layer is formed by supplying gas. 8. The conductive member is made of silver, copper, brass, iron, zinc, AL, Ni, stainless steel, or carbon. The molding method of the molded article described. 9. The method according to claim 7, wherein the magnetic member is a ferrite powder. 10. The method according to claim 7, wherein the paint is a conductive paint. 11. A mold having a movable part which can freely move back and forth in at least a part of a cavity is provided, a molding material is supplied to the cavity, and a gas is supplied to the molding material to form a hollow portion. Forming a coating layer in at least a part of a region of the molded product by providing a gap by retreating the movable portion and providing a coating forming member to the gap. Molding method. 12. When forming the coating layer inside the space, any one of a conductive member, a magnetic member, a paint member, a member different in color from the molding material, a fiber member, an antibacterial member, and a photocatalyst is included. 12. The method according to claim 11, wherein the coating layer is formed by supplying a gas. 13. The conductive member is made of silver, copper, brass, iron, zinc, AL, Ni, stainless steel, or carbon. The molding method of the molded article described. 14. The method according to claim 12, wherein the magnetic member is a ferrite powder. 15. The method according to claim 12, wherein the paint is a conductive paint. 16. A mold having a movable part which is free to advance and retreat in at least a part of a cavity is provided, a molding material is supplied to the cavity, and thereafter, the movable part is retracted to provide a gap. A method for molding a molded article, characterized in that a coating layer is formed in at least a partial region of the molded article by supplying a film-forming member to the gap. 17. When forming a coating layer on at least a part of the region, any one of a conductive member, a magnetic member, a paint member, a member different in color from the molding material, a fiber member, an antibacterial member, and a photocatalyst is used. 17. The method according to claim 16, wherein the coating layer is formed by supplying a gas containing the member. 18. The conductive member according to claim 17, wherein the conductive member is made of silver, copper, brass, iron, zinc, AL, Ni, stainless steel, or carbon. The molding method of the molded article described. 19. The method according to claim 17, wherein the magnetic member is a ferrite powder. 20. The method according to claim 17, wherein the paint is a conductive paint. 21. A mold having a movable portion that is free to advance and retreat in at least a part of the cavity is provided, a molding material is supplied to the cavity, and thereafter, the movable portion is retracted to provide a gap, A coating layer is formed in at least a part of the molded product by supplying the coating forming member to the gap, and the movable portion is further advanced to press the coating layer so as to be embedded in the molded product. A molding method of a molded product characterized by the following. 22. A mold having a pair of a fixed mold and a movable mold and having a movable portion which can freely advance and retreat in at least a part of the cavity, means for opening and closing the mold, and a molding material in the cavity. A molding material supply means for supplying a film forming member, a movable section driving means for moving the movable section forward and backward, and a film forming member supply means for supplying a film forming member into the cavity. . 23. A mold having a pair of a fixed mold and a movable mold and having a movable portion capable of freely moving back and forth in at least a part of the cavity, means for opening and closing the mold, and a molding material in the cavity. A high-pressure gas supply means for supplying a high-pressure gas to the cavity to form a hollow portion inside the molded article, a movable portion driving means for moving the movable portion forward and backward, and a coating film in the cavity. An apparatus for molding a molded article, comprising: a film forming member supply means for supplying a forming member. 24. A molded product having a concave portion by preparing a mold having a movable portion that can freely advance and retreat in at least a part of a region of the cavity, and supplying a molding material to the cavity while the movable portion is advanced. Is formed, and thereafter, the movable portion is retracted to form a void portion, and a film forming member is supplied to the void portion, so that at least one of the concave portion and the end surface of the concave portion forms the coating layer of the member. Forming a molded article. 25. A mold having a movable part which can freely advance and retreat in at least a part of the area of the cavity is provided, a molding material is supplied to the cavity in a state where the movable part is retracted, and a molded article is formed. The movable portion is advanced to form a thin portion in a portion corresponding to the partial area, and then the movable portion is retracted to provide a gap, and a film forming member is supplied to the gap, whereby the thin portion is formed. Forming a coating layer on the member. 26. A pair of molds comprising a movable mold and a fixed mold are prepared, a molding material is supplied to a cavity of the mold to form a molded product, and thereafter, the movable mold is retracted to form a gap. Forming a film on the surface of the molded product by providing a film-forming member in the gap. 27. The member according to claim 26, wherein the film forming member is any one of a conductive member, a magnetic member, a paint member, a fiber member, an antibacterial member, a photocatalyst, and an optical film forming member. Molding method for molded products. 28. In forming a coating, any one of a conductive member, a magnetic member, a paint member, an antibacterial member, a photocatalyst, an optical film forming member, a member different in color from the molding material, and a fiber member is used. The method for molding a molded article according to claim 26, wherein the coating layer is formed by supplying a gas containing: 29. The conductive member according to claim 28, wherein the conductive member is silver, copper, brass, iron, zinc, AL, Ni, stainless steel, or carbon. The molding method of the molded article described. 30. The method according to claim 28, wherein the magnetic member is a ferrite powder. 31. The method according to claim 28, wherein the paint member is a conductive paint. 32. A mold comprising a pair of a fixed mold and a movable mold, means for opening and closing the mold, molding material supply means for supplying molding material to the cavity, and a movable section for moving the movable section forward and backward. An apparatus for molding a molded article, comprising: a driving unit; and a film forming member supply unit that supplies a film forming member into the cavity. 33. A molded product having a concave portion by preparing a mold having a movable portion that can freely advance and retreat in at least a part of a region of the cavity, and supplying a molding material to the cavity while the movable portion is advanced. Forming a film layer in the concave portion by supplying a film-forming member to the void portion in the process of retracting the movable portion and forming a void portion thereafter. . 34. A process of preparing a mold having a movable part which can freely advance and retreat in at least a part of the cavity, supplying a molding material to the cavity, and then retracting the movable part to form a void. Forming a film layer on at least a part of the molded product by supplying a film-forming member to the gap. 35. A pair of molds comprising a movable mold and a fixed mold, and a molding material is supplied to a cavity of the mold,
Thereafter, a film is formed on the surface of the molded product by supplying the film-forming member to the cavity in the process of retracting the movable mold to form the cavity. 36. A mold having a movable part which can freely advance and retreat in at least a part of a region of the cavity, and a molding material is supplied to the cavity in a state where the movable part is retracted;
After a gas is supplied to the molding material to form a hollow portion, the movable portion is advanced to form a thin portion at a portion corresponding to the partial region, and then the movable portion is retracted to form a void portion. A method for molding a molded article, characterized in that a coating layer is formed on the thin portion by supplying a coating forming member to the gap during the process. 37. A mold having a movable part which can freely advance and retreat in at least a part of a cavity is provided, a molding material is supplied to the cavity, and a gas is supplied to the molding material to form a hollow portion. Forming a coating layer on at least a partial area of a molded product by supplying a film-forming member to the void portion in a process of retracting the movable portion to form a void portion. . 38. A step of preparing a mold having a movable part which can freely advance and retreat in at least a part of the cavity, supplying a molding material to the cavity, and then retracting the movable part to form a gap. A film-forming member is supplied to the void portion to form a film layer in at least a part of the area of the molded article,
The method of molding a molded product, further comprising advancing the movable portion to press the coating layer and burying the coating layer in the molded product. 39. A pair of molds comprising a movable mold and a fixed mold, and a molding material is supplied to a cavity of the mold,
Thereafter, the movable mold is retracted to form a gap, a film forming member is supplied to the gap, and further, the movable mold is advanced to press the film forming member, thereby forming a vicinity of the surface of the molded article. A method of molding a molded article, wherein the molded article is buried in a film.