JP2000238103A - Molding die device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a simply structured molding die device which efficiently transfers a microuneven shape without the extension of a molding cycle under efficient temperature control and is capable of obtaining a high-quality appearance resin molded product free from fins under control and further, has an insulating material hardly affected by qualitative degradation. SOLUTION: This molding die device is of such a functional structure that resin is packed in a cavity 1 having a microuneven shape 2 on the inner surface, and produces a resin molded product with the microuneven shape 2 transfer- formed on the surface. In this case the cavity 1 is formed by setting both mold parts 4a, 4b mounted on a template 3a of the movable half side and a template 3b on the fixed half side. In addition, the mold part 4a is temperature-adjustable and an insulating layer 5 is formed between the outside face of the mold part 4a and the template 3a, and further, a gap 6 is formed between the mold part 4a and the template 3a around the mold part 4a. Besides, the gap 6 is of such a size 1 that it is blocked by thermal expansion of the mold part 4a during molding.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a molding die apparatus for obtaining a resin molded product having fine irregularities on the surface.

[0002]

2. Description of the Related Art Conventionally, there has been known a molding die apparatus for obtaining a resin molded product in which a resin is filled in a cavity having a fine concave-convex shape on an inner surface of the cavity, and the fine concave-convex shape is transferred and formed on the surface. Are known. In this case, by filling the cavity with a resin at a high mold temperature, the transferability of the uneven shape on the cavity inner surface is improved, and the quality of the resin molded product is improved. Here, conventionally, generally, the entire mold is heated, but there is a problem that the molding cycle is lengthened and the productivity is reduced.

Japanese Patent Laid-Open Publication No. Hei 6-114885 discloses a method in which fine irregularities are not transferred and formed on the surface of a resin molded product. Are known. As shown in FIG. 13, the injection mold includes a movable mold plate 3a and a fixed mold plate 3b which are arranged to face each other, and mutually facing mold portions provided as input pieces in both of them. 4a, 4b, and an injection molding die for injecting and filling a resin into the cavity 1 formed between the two mold parts 4a, 4b, wherein a plurality of mold parts 4a, 4b constituting the cavity 1 are provided. A heat insulating layer 5 is formed between the mold portions 4a and 4b and the mold plates 3a and 3b that support them, thereby providing heat insulation between the mold portions 4a and 4b and the mold plates 3a and 3b. The configuration is such that the mold temperature of the plurality of mold portions 4a and 4b constituting the cavity 1 can be maintained and controlled at a highly accurate temperature.

In this case, molten high-temperature resin is injected and filled into the plurality of cavities 1 from the sprue 10 in the sprue bush 9 provided on the fixed-side mold plate 3b through the runner 24, and the resin is cooled and solidified. A plurality of resin molded products are obtained. In this case, the insulation between the portion of the cavity 1 formed by the mold portions 4a and 4b and the other portions other than the cavity 1 is achieved by the gap 6 and the heat insulating material 25 and the heat insulating layer 5 serving as the heat insulating portion. Therefore, the heat radiated from the resin in the cavity 1 can be quickly removed by the refrigerant controlled at a constant temperature with high precision circulated in the cooling holes provided in the mold portions 4a and 4b. In addition, the mold temperature can be quickly made uniform to a high-precision constant temperature, and a high-precision resin molded product can be obtained in a shortened molding cycle.

[0005]

However, in the prior art disclosed in Japanese Patent Application Laid-Open No. HEI 6-114885, the inner surface of the runner 24 serving as a resin flowing portion, that is, the space between the fixed side and the movable side is not provided. Since the low-rigidity heat insulating material 25 appears on the mold division surface, there is a problem that the mold is easily broken and the life of the mold is shortened.In addition, since the heat insulating material 25 exists,
There was also a problem that the setup during mold assembly was complicated.

SUMMARY OF THE INVENTION The present invention has been made in order to solve all the problems in the prior art described above, and its object is to efficiently control the temperature only in the vicinity of the inner surface of the cavity and to reduce the molding cycle. The transferability of fine irregularities is improved without extension, the occurrence of burrs is prevented, and a resin molded product with a high-quality appearance can be obtained.In addition, the heat insulating material does not easily deteriorate and the number of parts is small. Another object of the present invention is to provide a molding apparatus having a simple structure.

[0007]

According to a first aspect of the present invention, there is provided a molding die apparatus, wherein a resin is filled in a cavity having a fine irregular shape on the inner surface, and the fine irregular shape is formed on the surface. Is a molding die apparatus for obtaining a resin molded product having a transfer formed thereon, wherein a cavity is formed by opposing both mold portions provided on a movable mold plate and a fixed mold plate, and the mold portion can be adjusted in temperature. In addition, a heat insulating layer is formed between the outer surface of the mold portion opposite to the cavity inner surface and the mold plate, and a gap is formed between the mold portion and the mold plate around the same mold portion. The dimensions are set so as to be closed by thermal expansion of the mold during molding.

[0008] Therefore, in this case, at the time of high-temperature molding, the gap around the mold portion is closed by thermal expansion, so that the molten resin filled in the cavity does not enter the gap, and burrs are generated. At this time, heat radiation from the same section is prevented by the heat insulating layer, thereby achieving heat insulation. When the resin molded product is taken out, the temperature is controlled so that the mold part is cooled, and the mold part is reduced to secure a gap around the mold part. In this case, the resin in the cavity does not enter the gap in a solidified state, and the resin molded product can be easily taken out.

As described above, the temperature of only the mold portion located on the inner surface of the cavity can be efficiently controlled, so that the transferability of fine irregularities can be improved without extending the molding cycle, and burrs are generated. It is possible to easily obtain a resin molded product which is prevented and has a high quality appearance. In addition, the heat insulating material is used only in the heat insulating layer, the number of parts is small, the structure is simple, and the heat insulating layer does not come into contact with the molten resin, so that the deterioration can be prevented. As a result, the life of the mold can be extended.

[0010] According to a second aspect of the present invention, there is provided a molding die apparatus.
The molding die apparatus according to claim 1, wherein the inner surface of the cavity of the mold portion provided on the movable mold plate has fine irregularities.

[0011] Therefore, in this case, particularly, since the movable mold portion has a fine uneven shape and the resin can be injected and filled from the fixed mold portion, the residue caused by the resin injection is a resin molded product. Does not appear on the surface on which the same uneven shape is transferred and formed, and a resin molded product having a high quality appearance can be reliably obtained.

According to a third aspect of the present invention, there is provided a molding apparatus.
The molding die apparatus according to the second aspect is characterized in that a heat insulating layer and a gap are formed on a mold portion provided on a movable mold plate.

[0013] Therefore, in this case, particularly, the mold portion having the fine irregularities on the inner surface is effectively and sufficiently insulated by the heat insulating layer and the gap, so that the transferability of the irregularities is extremely good. .

According to a fourth aspect of the present invention, there is provided a molding die apparatus.
The molding die apparatus according to any one of claims 1 to 3, further comprising an intake unit communicating with the gap.

Accordingly, in this case, in particular, the air can be sucked and exhausted from the inside of the cavity through the gap by the suction means in the mold closed state, whereby the resin is formed into the same cavity with fine irregularities on its inner surface. Filling is ensured so as to be accurate, and the transferability of the uneven shape is further improved, so that a resin molded article having a higher quality appearance can be obtained.

According to a fifth aspect of the present invention, there is provided a molding die apparatus.
The molding die apparatus according to any one of claims 1 to 4, further comprising a pressure unit communicating with the gap.

Accordingly, in this case, in particular, air can be blown into the cavity by the air pressure means through the gap toward the resin molded product in the mold open state, whereby the releasability of the resin molded product is improved. Thus, the resin molded product can be more easily taken out.

[0018]

1 and 2 show a first embodiment of the present invention.
3 shows an embodiment corresponding to 3. In the molding die apparatus of this embodiment, a resin is filled in the cavity 1 having a fine uneven shape 2 on the inner surface of the cavity 1, and the fine uneven shape is formed on the surface. 2 is to obtain a resin molded product on which transfer is formed. In this case, the movable side template 3a and the fixed side template 3a
Cavity 1 with both mold parts 4a and 4b provided on 3b facing each other.
The mold part 4a is configured to be capable of adjusting the temperature.
A heat insulating layer 5 is formed between the outer surface of the cavity 1 opposite to the inner surface and the mold plate 3a, and a mold plate is formed around the same mold portion 4a.
A gap 6 is formed between the mold portion 4a and the gap 3a, and the dimension 1 of the gap 6 is set so as to be closed by thermal expansion of the mold portion 4a during molding. In the molding die apparatus of this embodiment, the inner surface of the cavity 1 of the mold part 4a provided on the movable mold plate 3a has fine irregularities 2 and the movable mold plate 3a The heat insulating layer 5 and the gap 6 are formed on the side of the mold portion 4a provided on the side.

The molten molding resin passes through the sprue 10 formed in the sprue bush 9 and fills the cavity 1. In order to manufacture a resin molded product having a fine uneven shape on the outer surface, an uneven shape 2 having the inverted uneven shape is formed on the inner surface of the movable side mold portion 4a. Here, the concavo-convex shape 2 may be formed on the fixed-side mold part 4b or on both the movable-side and fixed-side mold parts 4a, 4b, but is formed on the inner surface of the movable-side mold part 4a. Is preferred. The uneven shape 2 is a prism shape in which unevenness is alternately provided at a pitch of several μm to several tens μm, but may be another fine uneven shape 2. As described above, in molding to obtain a resin molded product on which the fine irregularities 2 serving as the prism shape are transferred, PMMA resin having excellent transferability is used as a molding resin. In this case, 230-25
When filling the cavity 1 with the PMMA resin heated to 0 ° C., the inner surface (the uneven shape 2) of the mold part 4a on the movable side needs to be maintained at a glass transition point temperature (100 to 120 ° C.) or higher. There is. When the resin molded product is taken out of the cavity 1 without deformation, the temperature of the resin molded product is set to a solidification temperature (70%).
8585 ° C.) or lower.

As an example of the above temperature change, the temperature of the movable mold 4a is increased from 70 ° C. to 120 ° C. before filling with resin, and the temperature of the mold 4a is increased by 1 mm before removing the resin molded product.
It can be cooled from 20 ° C to 70 ° C. In the case where the molding is performed with such a temperature change, the dimension 1 of the gap 6 is changed to the normal temperature state (25 ° C.) for the movable side mold portion 4a having the fine irregularities 2 having a total length L of about 500 mm. ) At 0.4 ~ 0.
By setting the design value to 5mm, when cooling (70 ° C)
As shown in FIG. 1, it is possible to secure a gap 6 having a dimension l of 0.2 to 0.3 mm and a heat-insulating function, and it is possible to heat only the same-shaped portion 4a by heat insulation. Further, at the time of heating (120 ° C.), as shown in FIG. 2, the gap 6 is reliably closed by thermal expansion of only the movable mold 4a, and burrs are generated even if the cavity 1 is filled with resin. do not do. Here, the mold portion 4a is made of a material having a large linear expansion coefficient, for example, brass,
It is made of aluminum, a zinc alloy or the like, and therefore, a large gap 6 can be secured as described above.

A plurality of through holes 11 for temperature adjustment are formed in the movable side mold portion 4a, through which a liquid such as oil serving as a cooling medium flows. The heater 4 is inserted and buried in the inside 11 so that the temperature of the same-shaped portion 4a is adjusted by cooling or heating. Further, the heat insulating layer 5 and the gap 6 may be formed on the fixed mold part 4b having no unevenness 2 or on both the movable mold side and the fixed mold part 4a, 4b. It is preferably formed on the part 4a side. In the drawing, reference numeral 12 denotes a movable mounting plate, and 13 denotes a spacer block. A protruding plate 14 is housed in a space formed between the mounting plate 12 and the movable template 3a by the spacer block 13. The sprue bush 9 is buried and fixed in the middle of the mounting plate 15, and the sprue bushing 9 is formed at the injection side opening of the sprue 10 formed in the sprue bush 9. The locate ring 16 is attached and fixed.

Therefore, in the molding die apparatus of this embodiment, when the molding is heated to a high temperature, the surrounding gap 6 is closed by the thermal expansion of only the mold portion 4a, so that the cavity 1 is injected and filled. The melted resin that has been melted does not enter the gap 6, and the occurrence of burrs is prevented. Moreover, at this time, the heat radiation from the heated mold part 4a is dissipated by the heat insulating layer 5a.
Therefore, heat insulation is achieved between the same mold portion 4a and the mold plate 3a. Also, when removing the resin molded product,
The temperature is adjusted so that the mold 4a is cooled, and the mold portion 4a is reduced and a gap 6 is secured around the mold portion 4a. Therefore, the gap 6 and the heat insulating layer 5 provide sufficient heat insulation. Moreover, at this time, since the resin in the cavity 1 is in a solidified state, even if the gap 6 is opened, it does not enter the gap 6 and the resin molded product can be easily taken out.

As described above, since only the mold portion 4a located on the inner surface of the cavity 1 can be efficiently heated or cooled to control the temperature, it is possible to transfer the fine irregularities 2 without extending the molding cycle. Is improved, and the occurrence of burrs is prevented, so that a resin molded product having a high quality appearance can be easily obtained. In addition, the heat insulating material is used only in the heat insulating layer 5 and the number of parts is small, so that the structure is simple and the resin in the molten state does not contact the heat insulating layer 5, so that its deterioration is prevented. And the life of the mold can be prolonged.

In the molding die apparatus of this embodiment, since the mold portion 4a having the fine irregularities 2 on the inner surface is effectively and sufficiently insulated by the heat insulating layer 5 and the gap 6, The transferability of the shape 2 is extremely good. Moreover, since the fine irregularities 2 exist on the movable mold part 4a and the resin can be injected and filled from the sprue 10 provided on the fixed mold part 4b, the residue due to the resin injection is a resin molded product. Does not appear on the surface on which the same uneven shape 2 is transferred and formed. Therefore, a resin molded product having a high quality appearance can be reliably obtained.

FIG. 3 shows another embodiment corresponding to claims 1 to 4 of the present invention. The molding die apparatus of this embodiment is provided with an intake means 7 communicating with the gap 6. The suction means 7 is a vacuum pump, and is connected to the gap 6 via an exhaust pipe 17. The exhaust pipe 17 is connected to the movable mold plate 3a, and the exhaust pipe 17 is provided with an open / close valve 18. Here, on the side where the gap 6 is formed, the suction means 7 is formed on the fixed-side mold portion 4b having no concave-convex shape 2 or on both the movable-side and fixed-side mold portions 4a and 4b. May be.

The manufacturing method in this case includes the following molding steps (1) to (5). (1) Close the mold and heat the mold part 4a. (2) Fill the cavity 1 with resin. (3) Cool the mold part 4a. (4) Open the mold. (5) Take out the resin molded product. 1 and 2, but in this case, in the step (1),
Evacuation from the gap 6-off valve 18 is opened in the cavity 1 (degree of vacuum in the cavity 1 10 ⁰ ~10 ^-2 Torr) is carried out. In the step (2), the gap 6 is closed, and in the steps (3) to (5), the gap 6 is opened and the on-off valve 18 is closed.

Therefore, in the molding die apparatus of this embodiment, in particular, air can be sucked and exhausted from the cavity 1 through the gap 6 by the suction means 7 in the mold closed state in the step (1). As a result, the resin is reliably filled into the cavity 1 so as to accurately follow the fine irregularities 2 on the inner surface thereof, and the transferability of the irregularities 2 is further improved, and a resin molded product having a higher quality appearance is obtained. be able to. Except for this, the configuration is the same as that of the embodiment shown in FIGS. 1 and 2, and the same operation and effect as in the above-described embodiment are exerted. Further, in this case, since the mold portion 4a is formed of a material having a large linear expansion coefficient, a large gap 6 is secured, and the resistance at the time of evacuation is reduced.

FIGS. 4 and 5 show still another embodiment corresponding to claims 1 to 3 of the present invention. In the molding die apparatus according to this embodiment, the pressure means 8 communicating with the gap 6 is provided. Have. The air pressure means 8 is a compressor, and the air supply pipe 19
Through the gap 6. The air supply pipe 19 is connected to the movable mold plate 3a.
Is provided. Here, if the pressure means 8 is on the side where the gap 6 is formed with the resin molded product A, the irregular shape 2
May be formed on the side of the fixed mold section 4b that does not have the mold, or on both the movable and fixed mold sections 4a and 4b.

The manufacturing method in this case is the same as in the description of the embodiment shown in FIG. 3 described above. (1) Close the mold, heat the mold part 4a, (2) Fill the cavity 1 with resin,
This is a series of molding steps of (3) cooling the mold part 4a, (4) opening the mold, and (5) taking out the resin molded product A. In this case, in the steps (1) to (4), the opening / closing valve 18 is closed, and air is not supplied into the cavity 1. After the mold opening in the step (4), in the step (5), as shown in FIG. 5, the opening / closing valve 18 is opened and air is directed from the gap 6 toward the resin molded product A in the cavity 1 in the mold opened state. It is blown out (air pressure is 2 to 5 kg / cm ² ), and in this state, the resin molded product A is released from the mold and taken out.

Therefore, in the molding die apparatus of this embodiment, in particular, in the step (5) after opening the mold, the pressurizing means 8
As a result, air can be blown into the cavity 1 through the gap 6 toward the resin molded product A, whereby the releasability of the resin molded product A is improved, and the resin molded product A can be more easily taken out. Will be able to do it. Except for this, the configuration is the same as that of the embodiment shown in FIGS. 1 and 2, and the same operation and effect as in the above-described embodiment are exerted.

FIGS. 6 and 7 show still another embodiment corresponding to all of the first to fifth aspects of the present invention. In the molding die apparatus of this embodiment, an exhaust means 7 and a compressed air communicating with the gap 6 are provided. Means 8 are provided. In this case, the configuration in the embodiment shown in FIG. 3 and the configuration in the embodiment shown in FIGS. 4 and 5 are combined, and each configuration is the same as that in the above-described embodiment. The air pressure means 8 and the gap 6 are connected to each other by a branch pipe 20, and the configuration is different from the above embodiment only in that a switching valve 21 is provided at a branch portion of the branch pipe 20. .

The manufacturing method in this case is the same as in the description of the embodiment shown in FIG. 3 described above. (1) Close the mold, heat the mold part 4a, (2) Fill the cavity 1 with resin,
This is a series of molding steps of (3) cooling the mold part 4a, (4) opening the mold, and (5) taking out the resin molded product A. In this case, in the step (1), the switching valve 21 is opened to the exhaust means 7 side, and the inside of the cavity 1 is evacuated from the gap 6.
In the step (2), the gap 6 is closed.
In (3) to (4), the gap 6 is opened and the switching valve 21 is closed. After the mold opening in the step (4), in the step (5), as shown in FIG. 7, the switching valve 21 is opened to the pressure means 8 side and the resin molded product A in the cavity 1 in the mold opened state through the gap 6 is opened. Is blown out toward the mold, and in this state, the resin molded product A is released and taken out. In addition,
The conditions such as the degree of vacuum at the time of evacuation and the air pressure at the time of blowing air are the same as those in the embodiment shown in FIGS. Also in this case, since the mold portion 4a is formed of a material having a large linear expansion coefficient, a large gap 6 is secured, and the resistance at the time of evacuation is reduced.

Therefore, in the molding die apparatus of this embodiment, the same functions and effects as those of the embodiment shown in FIGS. 3, 4 and 5 can be obtained. The transferability of the fine concavo-convex shape 2 is further improved, so that a resin molded product A having a higher quality appearance can be obtained, and the mold releasability of the resin molded product A can be improved, which can be more easily taken out. Become like Except for this, the configuration is the same as that of the embodiment shown in FIGS. 1 and 2, and the same operation and effect as in the above-described embodiment are exerted.

FIG. 8 shows still another embodiment corresponding to the first to third and fifth aspects of the present invention. In the molding die apparatus of this embodiment, the mold portion 4a is constituted by a split mold. , A pressure means 8 communicating with the gap 6. In this case, a peripheral gap 6 is provided at each of the divided portions of the mold portion 4a configured as a divided mold.
A plurality of divided gaps 6a communicating with are formed.

Therefore, in the molding die apparatus of this embodiment, after the mold is opened, the cavity 1 is opened by the pressurizing means 8.
When air is blown into the resin molded product A through the gap 6, the air branches and flows from the gap 6 to the plurality of divided gaps 6 a, so that the air is blown to the entire surface of the resin molded product A. Is done. Therefore, the releasability of the resin molded product A is further improved, and the exhaust conductance of air and gas is also reduced. Otherwise, the configuration is the same as that of the embodiment shown in FIGS. 4 and 5, and the same operation and effect as in the above-described embodiment are exerted.

FIG. 9 shows still another embodiment corresponding to the first to third aspects of the present invention. In the molding die apparatus of this embodiment, the movable side mold portion 4a is provided with oil for cooling medium. Hole 11 serving as a conduit for flowing air and cartridge heater 22 for heating
Are alternately arranged side by side, so that the temperature of the same part 4a is adjusted by cooling or heating. In this case, the cartridge heater 22 is used as the heating medium, but as the heating medium, a Peltier element, or oil, pressurized water, air, or the like flowing in the through-hole 11 may be used, and heating is possible. Any medium can be used without particular limitation. Further, although oil flowing into the through hole 11 is used as a cooling medium, as the cooling medium, water, air, or a Peltier element or the like flowing into the through hole 11 may be used. Any medium that can be cooled is used without any particular limitation. Further, the configuration serving as the cooling medium and the heating medium may be formed on the fixed mold part 4b side having no concave-convex shape 2 or on both the movable mold side and the fixed mold part 4a, 4b side. It is preferably formed on the movable mold 4a side.

Therefore, in the molding die apparatus of this embodiment, since the mold portion 4a is provided with both structures that serve as a cooling medium and a heating medium, the cooling medium and the heating medium are interlocked with the molding process. By actuating the
Temperature control by only heating and cooling is performed efficiently,
The molding cycle is reliably shortened. Except for this, the configuration is the same as that of the embodiment shown in FIGS. 1 and 2, and the same operation and effect as in the above-described embodiment are exerted.

FIG. 10 shows still another embodiment corresponding to claims 1 to 3 of the present invention. In the molding die apparatus of this embodiment, the movable mold part 4a is constituted by a casting heater. I have. The cast heater is one in which an electric heater is embedded in a casting of aluminum or the like, and has a high degree of freedom in heating design. In this case, oil serving as a cooling medium flows through the plurality of through holes 11 formed in the mold portion 4a. As the cooling medium, water, air, or , A Peltier element or the like may be used, and any medium can be used as long as it can be cooled. In addition, the configuration of the cast heater may be formed on the fixed mold part 4b having no concave-convex shape 2 or on both the movable mold part and the fixed mold part 4a, 4b. It is preferably formed on the 4a side.

Therefore, in the molding die apparatus of this embodiment, since the mold portion 4a is formed by a cast-in heater, the heating efficiency is improved by the uniform heating property of the mold portion 4a, and the degree of freedom in cooling design is increased. Be improved. Except for this, the configuration is the same as that of the embodiment shown in FIGS. 1 and 2, and the same operation and effect as in the above-described embodiment are exerted.

FIGS. 11 and 12 show still another embodiment corresponding to the first to third aspects of the present invention. In the molding die apparatus of this embodiment, the temperature detecting sensor 23 is attached to the movable mold part 4a.
Is provided, so that the temperature of the mold portion 4a can be detected. As the temperature detection sensor 23, a thermocouple sensor, an infrared temperature sensor, or the like is used, and the number thereof is not particularly limited. Further, the temperature detection sensor 23 is provided on the side of the fixed mold section 4b having no unevenness 2 or on both the movable mold side and the fixed mold section 4a, 4b.
Although it may be provided on the side, it is preferably provided on the side of the mold part 4a on the movable side.

Therefore, in the molding die apparatus of this embodiment, as shown in FIG. 12 (upper line graph), the measured value of the temperature of the mold part by the temperature detection sensor 23 has reached the glass transition temperature of the molding resin. Sometimes, the cavity 1 is filled with the same resin, and when the measured temperature of the mold portion reaches the solidification temperature of the resin, the mold can be opened. As shown in FIG. 12 (lower line graph), cooling of the mold part 4a is started a predetermined time before the measured value of the mold part temperature by the temperature detection sensor 23 reaches the glass transition temperature of the molding resin. The heating of the mold part 4a can be started a predetermined time before the measured part temperature reaches the solidification temperature of the resin. By adopting such a molding manufacturing method, the transferability of the fine irregularities 2 on the inner surface of the cavity 1 is further improved, and the releasability of the resin molded product is also improved. Except for this, the configuration is the same as that of the embodiment shown in FIGS. 1 and 2, and the same operation and effect as in the above-described embodiment are exerted.

[0042]

As described above, in the molding die apparatus according to the first aspect of the present invention, the transferability of fine irregularities is improved without prolonging the molding cycle, and the occurrence of burrs is prevented, thereby improving the molding performance. A resin molded product with a good appearance can be easily obtained, and the number of parts relating to the heat insulating material is small, the structure is simple, and the deterioration of the heat insulating layer can be prevented, so that the life of the mold can be prolonged. Is also planned.

In the molding die apparatus according to the second aspect of the present invention, in particular, the resin can be injected and filled from the fixed side mold portion, and the residue due to the resin injection is reduced to the irregular shape of the resin molded product. Does not appear on the surface on which the transfer has been formed, and a resin molded product having a high quality appearance can be reliably obtained.

Further, in the molding die apparatus according to the third aspect of the present invention, in particular, the mold portion having the fine irregularities on its inner surface is effectively and sufficiently insulated, and the transferability of the irregularities is improved. Is extremely good.

In the molding die apparatus according to the fourth aspect of the present invention, in particular, by sucking and exhausting air from the inside of the cavity through the gap in the closed state of the mold, the resin is finely divided into the inside of the cavity. The resin molding is filled reliably so as to accurately follow the irregular shape, and the transferability is further improved, so that a resin molded product having a higher quality appearance can be obtained.

Further, in the molding die apparatus according to the fifth aspect of the present invention, in particular, by blowing air toward the resin molded product through the gap into the cavity while the mold is opened, the resin molded product is separated. The moldability is improved, and this can be more easily taken out.

[Brief description of the drawings]

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

FIG. 2 is an exemplary sectional view showing a state in another step of the molding die apparatus according to the embodiment;

FIG. 3 is a sectional view showing a molding die apparatus according to another embodiment.

FIG. 4 is a cross-sectional view showing a molding apparatus according to still another embodiment.

FIG. 5 is an exemplary sectional view showing a state in another step of the molding die apparatus according to the embodiment;

FIG. 6 is a cross-sectional view showing a molding apparatus according to still another embodiment.

FIG. 7 is an exemplary sectional view showing a state in another step of the molding die apparatus according to the embodiment;

FIG. 8 is a sectional view showing a molding apparatus according to still another embodiment.

FIG. 9 is a sectional view showing a molding die apparatus according to still another embodiment.

FIG. 10 is a cross-sectional view showing a molding apparatus according to still another embodiment.

FIG. 11 is a sectional view showing a molding apparatus according to still another embodiment.

FIG. 12 is a line graph showing an operation state of the molding die apparatus according to the embodiment.

FIG. 13 is a cross-sectional view showing a conventional molding die apparatus.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cavity 2 Concavo-convex shape 3a Moving-side mold plate 3b Fixed-side mold plate 4a Movable-side mold portion 4b Fixed-side mold portion 5 Thermal insulation layer 6 Gap 7 Intake means 8 Compressed means

Continued on the front page F term (reference) 4F202 AA21 AG05 AH76 AJ13 AM33 CA11 CB01 CB29 CK02 CM04 CM08 CM14 CM16 CN01 CN05 CN15 CP06

Claims (5)

[Claims] 1. A molding die apparatus for obtaining a resin molded product in which a resin is filled in a cavity having a fine uneven shape on an inner surface of the cavity, and the fine uneven shape is transferred and formed on a surface of the cavity. A cavity is formed by opposing both mold portions provided on the movable mold plate and the fixed mold plate, and the mold portion is capable of adjusting the temperature, and an outer surface opposite to the cavity inner surface of the mold portion. A heat insulation layer is formed between the mold and the mold, a gap is formed between the mold and the mold around the mold, and the size of the gap is set so as to be closed by thermal expansion of the mold during molding. Forming mold equipment. 2. The molding die apparatus according to claim 1, wherein the inner surface of the cavity of the mold portion provided on the movable mold plate has fine irregularities. 3. The molding die apparatus according to claim 2, wherein a heat insulating layer and a gap are formed on a mold portion side provided on the movable mold plate. 4. The molding die apparatus according to claim 1, further comprising an intake unit communicating with the gap. 5. The molding die apparatus according to claim 1, further comprising a pressure means communicating with the gap.