JP2012250379A - Foil transfer injection molding method and foil transfer injection molding device, and mold - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a foil transfer injection molding method that can avoid a wrinkle or breakage of a film, even if a three-dimentional molded article is subjected to foil transfer injection molding.SOLUTION: A first mold 11 and a second mold 12 are approximated, a frame-like movable block 15 provided in the second mold 12 is brought into contact with the first mold 11, and a sealed space is formed by the film 13 between the first mold 11 and the second mold 12, the second mold 12 and the movable block 15. Gas is injected into the sealed space from a gas injection path 18 which is provided in the second mold 12, so that the film 13 is preformed to be adapted to a recess 11a of the first mold 11.

Description

  The present invention relates to a foil transfer injection molding method and foil transfer injection molding apparatus for transferring a film transfer layer onto the surface of a molded product simultaneously with injection molding of the molded product, and a mold used for foil transfer injection molding. .

  Foil transfer injection molding decorates the surface of the molded product or imparts the desired function to the surface of the molded product by transferring the film transfer layer to the surface of the molded product simultaneously with the injection molding of the molded product. It is a construction method. Specifically, for example, a transfer layer having a design film on which a design such as a color, a pattern, or a pattern is printed, or a transfer layer having a functional film having functions such as antibacterial, shielding effect, and fingerprint-less is provided on the substrate. A film with a structure laminated to the upper mold and the lower mold is placed and clamped. After the resin is injected into the space (cavity) formed by the upper mold and the lower mold, the mold is opened. At the same time as molding the molded product, the transfer layer of the film can be transferred to the surface of the molded product. In foil transfer injection molding, when the mold is opened, the transfer layer is peeled off from the substrate and only the transfer layer is adhered to the surface of the molded product. There is one that punches out and adheres the base material to the surface of the molded product.

  As described above, the foil transfer injection molding can obtain a molded product having a transfer layer on the surface by injection molding. However, when the foil transfer injection molding is applied to a three-dimensional molded product, the elongation of the film due to the injection pressure of the molten resin is not uniform, and wrinkles may occur. In addition, at the corners of the molded product, the injection pressure is concentrated and the elongation of the film is increased, so that there is a risk of tearing. Therefore, when the molded product has a three-dimensional shape, an imbalance in the elongation of the film and a concentration of the injection pressure on the local part of the film are problems for practical use.

  In response to the above problems, a suction mechanism is provided in the mold, and the film is preliminarily aligned with the concave surface of the mold by the suction force, thereby causing wrinkles due to unbalanced film elongation and concentration of injection pressure on the local area of the film. For example, Patent Document 1 proposes an injection molding simultaneous transfer device that prevents tearing.

  FIG. 12 shows an injection molding simultaneous transfer device disclosed in Patent Document 1. This simultaneous injection molding transfer apparatus shown in FIG. 12 feeds a transfer film 3 having a transfer layer between a pair of molds 1 and 2 and transfers it by an air suction part 5 provided on the parting surface 4 of the mold. After sucking the film 3 and fixing it at a predetermined position on the parting surface 4 of the mold, the transfer film 3 is sucked from the suction hole 7 formed in the cavity forming part 6 of the mold 1 to thereby form the cavity of the mold 1. Then, the mold is closed, the molten resin is injected, cooled and solidified, and the mold is opened. At the same time as the injection molding of the molded product, a film transfer layer is formed on the surface of the molded product. It becomes the composition which transcribes.

Japanese Patent Laid-Open No. 5-200780

However, in the above-described conventional apparatus, the film is brought along the concave surface of the mold by the suction force, so that the force for moving the film along the concave surface of the mold is 1 atm (1 kg / cm ² ) at the maximum, and the concave surface of the mold. There is insufficient pressure to keep the film in close contact. That is, the elongation of the film is insufficient. Therefore, the film does not completely adhere to the concave surface of the mold, and finally the film is made to conform to the concave surface of the mold by the injection pressure of the molten resin. As a result, the action of stretching the film works locally and suddenly, and there is a possibility that the film is torn or wrinkles are generated in the film due to an imbalance in the elongation of the film. Therefore, the method of bringing the film along the concave surface of the mold by the suction force is limited to application to a molded product having a low elongation rate and close to a planar shape.

  In view of the above-mentioned conventional problems, the present invention is a foil transfer injection molding method and apparatus capable of avoiding wrinkling and tearing of a film even when a three-dimensional molded product is foil transfer injection molded, and used for foil transfer injection molding The purpose is to provide a mold.

  In the foil transfer injection molding method of the present invention, a film is disposed between a first mold and a second mold, the film is preformed along a recess of the first mold, and the first mold is formed. After the mold and the second mold are clamped, the resin is injected and injected into the space formed by the first mold and the second mold from the resin injection path provided in the second mold The foil transfer injection molding method for transferring the transfer layer of the film to the surface of the molded product at the same time as molding the molded product by opening the first mold and the second mold. When preforming the film, the first mold and the second mold are brought close to each other, and a frame-shaped movable block provided on the second mold is brought into contact with the first mold, The film disposed between the first mold and the second mold, the second mold, and the movable blower To form a sealed space and inject gas into the sealed space from a gas injection path provided in the second mold so that the film follows the recess of the first mold. It is characterized by preforming.

  In the foil transfer injection molding method of the present invention, when forming the sealed space, the convex portion provided in the second mold is brought into contact with the film, and the second gold heated by the film heating means is used. The heat of the convex part of the mold may be transferred to the film.

  In the foil transfer injection molding method of the present invention, after the start of gas injection into the sealed space, cooling by a cooling unit provided in the second mold may be started.

  In the foil transfer injection molding method of the present invention, hot air may be used as the gas injected into the sealed space.

  In the foil transfer injection molding method of the present invention, when injecting gas into the sealed space, the movable nest provided in the first mold is driven to drive at least one of the bottom surfaces of the recesses of the first mold. The part may be retracted, and after a part of the film reaches the space formed by the retreat, the film may be returned to the original position, and the film may be preformed along the recess of the first mold.

  Further, the foil transfer injection molding apparatus of the present invention is arranged after placing a film between the first mold and the second mold, and preforming the film along the concave portion of the first mold, The first mold and the second mold are clamped, and resin is injected into a space formed by the first mold and the second mold from a resin injection path provided in the second mold. After the injection and injection, a foil transfer injection molding apparatus that molds the molded product by opening the first mold and the second mold, and simultaneously transfers the transfer layer of the film onto the surface of the molded product. When the first mold and the second mold approach the second mold, the first mold comes into contact with the first mold and is disposed between the first mold and the second mold. A frame-shaped movable block that forms a sealed space together with the film and the second mold, and the sealed A gas injection path for injecting gas into the space, and by injecting gas from the gas injection path into the sealed space, the film is preformed along the recess of the first mold. It is characterized by doing.

  In the foil transfer injection molding apparatus of the present invention, the second mold is provided with a convex portion that contacts the film when the sealed space is formed, and a film heating unit that heats the convex portion. The film that contacts the convex portion of the second mold may be heated.

  In the foil transfer injection molding apparatus of the present invention, a cooling means may be provided in the second mold, and cooling by the cooling means may be started after the start of gas injection into the sealed space.

  The foil transfer injection molding apparatus of the present invention may include gas heating means for applying heat to the gas injected into the sealed space.

  In the foil transfer injection molding apparatus of the present invention, the first mold is provided with a movable nest that forms at least a part of the bottom of the concave portion of the first mold, and the movable nest is retreated, and is formed by the retreat. After a part of the film reaches the closed space by gas injection into the sealed space, the movable nest is returned to the original position so that the film follows the recess of the first mold. May be preformed.

  The mold according to the present invention includes a pair of a first mold and a second mold, and the first mold and the second mold come close to the second mold, and the first mold is used. A frame-like movable block that forms a sealed space together with the film and the second mold disposed between the first mold and the second mold, and the sealed A gas injection path for injecting gas into the space; and a resin injection path for injecting resin into the space formed by clamping the first mold and the second mold. Features.

  In the mold according to the present invention, the second mold may be provided with a convex portion that comes into contact with the film when the sealed space is formed, and a film heating means that heats the convex portion. .

  In the mold of the present invention, the second mold may be provided with a cooling means.

  In the mold according to the present invention, the first mold may be provided with a movable nest that forms at least a part of the bottom of the recess of the first mold.

  According to the present invention, even when a molded product having a three-dimensional shape is injection-molded, at the same time, even when a film transfer layer is transferred to the surface of the molded product, the film can be stretched uniformly and wrinkles and tears of the film are suppressed. be able to.

Sectional drawing which shows the principal part of the foil transcription | transfer injection molding apparatus which concerns on Embodiment 1 of this invention. Process sectional drawing which shows the sealed space formation process of foil transcription | transfer injection molding which concerns on Embodiment 1 of this invention Process sectional drawing which shows the film preform process of foil transfer injection molding which concerns on Embodiment 1 of this invention Process sectional drawing which shows the mold clamping process of foil transcription | transfer injection molding which concerns on Embodiment 1 of this invention Process sectional drawing which shows the molten resin filling process of foil transfer injection molding which concerns on Embodiment 1 of this invention Process sectional drawing which shows the molded article taking-out process of foil transfer injection molding which concerns on Embodiment 1 of this invention Process sectional drawing which shows the state before a film contact | abuts to a metal mold | die in the film preform process of foil transfer injection molding which concerns on Embodiment 1 of this invention. Process sectional drawing which shows the state immediately after the film contact | abutted to the bottom face of the recessed part of a metal mold | die in the film preform process of foil transfer injection molding which concerns on Embodiment 1 of this invention. Process sectional drawing which shows the state immediately before a film completely follows the recessed part of a metal mold | die in the film preform process of foil transfer injection molding which concerns on Embodiment 1 of this invention. Process sectional drawing which shows the state which has retracted the movable nest in the film preform process of foil transfer injection molding concerning Embodiment 2 of this invention Process sectional drawing which shows the state which returned the movable nest to the original position in the film preform process of foil transcription | transfer injection molding which concerns on Embodiment 2 of this invention. Diagram showing a conventional injection molding simultaneous transfer device

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. However, the same components may be denoted by the same reference numerals, and redundant description may be omitted. In addition, in order to make it easy to understand, the drawings schematically show each component as a main component. In addition, the thickness, length, number, and the like of each illustrated component are different from actual ones for the convenience of drawing.

(Embodiment 1)
1 is a cross-sectional view showing a main part of a foil transfer injection molding apparatus according to Embodiment 1 of the present invention.

  As shown in FIG. 1, this apparatus includes a mold composed of a pair of a first mold 11 and a second mold 12 and a molding shot between the first mold 11 and the second mold 12. And a film feeding device 14 for sending and arranging the film 13.

  The film 13 has a structure in which a transfer layer 13a is laminated on a base material 13b. The transfer layer 13a has, for example, a design film on which a design such as a color, a pattern, or a pattern is printed, or a functional film having functions such as antibacterial, shielding effect, and fingerprintless.

  In the mold according to the first embodiment, the first mold 11 that is the lower mold is provided with a recess 11a, and the second mold 12 that is the upper mold is projected into the recess 11a of the first mold 11. When the first mold 11 and the second mold 12 are clamped, the concave portion 11a of the first mold 11 and the convex portion of the second mold 12 that has entered the concave portion 11a are provided. A cavity is formed by a gap with 12a, and molten resin is injected and injected into the cavity from a resin injection path 12b formed in the second mold 12.

  The second mold 12 is provided with a frame-shaped movable block 15 supported by a spring 16 so as to surround the recess 11 a of the first mold 11. An O-ring 17 that is an example of an elastic body is provided on the distal end surface of the movable block 15.

  Further, a gas injection path 18 is formed in the second mold 12. The gas injection path 18 ejects the compressed gas fed from a compressed gas supply means (not shown) toward the film 13 and preforms the film 13 along the recess 11 a of the first mold 11. The compressed gas supply means can be configured using, for example, a gas cylinder and a valve connected to the gas cylinder.

  Further, the second mold 12 is provided with a heater 19 which is an example of a film heating unit. The heater 19 is connected to a heater driving means (not shown). When a current is supplied from the heater driving means, heat is generated to raise the temperature of the convex portion 12a of the second mold 12, and the second The film 13 in contact with the convex portion 12a of the mold 12 is heated and softened to make it easy to stretch. Therefore, the heater 19 is preferably provided on the convex portion 12a of the second mold 12. The film heating means is not limited to a heater, and for example, a hot air circuit may be formed in the second mold 12 and hot air may be sent to the hot air circuit.

  The second mold 12 is formed with a cooling water channel 20 which is an example of a cooling means. Cooling water is fed into the cooling water channel 20 from a pump (not shown), and the mold is cooled, whereby the molten resin filled in the cavity is cooled and solidified. The means for cooling the mold is not limited to cooling water. For example, a coolant path may be formed in the second mold 12 and the coolant may be sent to the coolant path.

  The second mold 12 is provided with a hot air unit 21 which is an example of a gas heating means for heating the compressed gas sent into the gas injection path 18. The hot air unit 21 can be composed of, for example, a heater.

  Next, the operation of the foil transfer injection molding apparatus configured as described above will be described. 2-6 is sectional drawing of each process of foil transcription | transfer injection molding in embodiment of this invention.

  First, after a predetermined range of the film 13 is sent and arranged between the first mold 11 and the second mold 12 by the film feeding device 14, the second mold 12 is moved as shown in FIG. The O-ring 17 is moved by the spring force of the spring 16 that pushes the frame-shaped movable block 15 by moving it toward the first mold 11 and bringing the first mold 11 and the second mold 12 close to each other. Pressed against the first mold 11, the film 13, the movable block 15, and the second mold 12 form a sealed space in which airtightness is ensured.

  When forming the sealed space, the convex portion 12a of the second mold 12a is brought into contact with the film 13, and the heat of the convex portion 12a of the second mold 12 heated by the heater 19 is transmitted to the film 13. The film 13 is heated and softened by heating to make it easy to stretch. Therefore, it is preferable to drive the heater 19 provided in the second mold 12 so that the temperature is raised to the film softening temperature when the convex portion 12a of the second mold 12a contacts the film 13. is there. In this way, for example, the molding cycle time can be made shorter than when the heater 19 is driven after the convex portion 12a of the second mold 12a contacts the film 13.

  The heating operation by the heater 19 is controlled, for example, by providing a temperature measuring means on the convex portion 12a of the second mold 12 and stopping when the convex portion 12a of the second mold 12 reaches the film softening temperature. May be.

  Note that the elastic body such as the O-ring 17 may be provided as necessary, and may be omitted as long as the airtightness of the sealed space can be ensured without it.

  Next, as shown in FIG. 3, by injecting the compressed gas heated by the hot air unit 21 from the gas injection path 18 into the space sealed by the film 13, the movable block 15, and the second mold 12, The film 13 is preformed along the concave portion 11 a of the first mold 11.

  Thus, by injecting the compressed gas heated by the hot air unit 21, the temperature drop of the film 13 due to the separation from the convex portion 12a of the second mold 12 is suppressed, and the stretchable state is maintained. The film 13 can be preformed.

  If the film 13 is separated from the convex portion 12a of the second mold 12 by injection of compressed gas, the heat of the convex portion 12a of the second mold 12 is not necessary, and in the subsequent process, molten resin is injected into the cavity. Since it is cooled and solidified after filling, it is preferable to inject cooling water into the cooling water channel 20 after the start of injection of the compressed gas and start cooling the second mold 12 heated by the heater 19. It is.

  In the cooling water injection operation, a temperature measuring means is provided on the convex portion 12a of the second mold 12 so that the convex portion 12a of the second mold 12 has a predetermined temperature (for example, molten resin filled in the mold cavity). It may be controlled to stop when it reaches a temperature at which it solidifies. After the cooling water injection operation is stopped, air purge is performed until the cooling water runs out of the cooling water channel 20.

  As described above, when the film 13 is separated from the convex portion 12a of the second mold 12 by the injection of the compressed gas, by starting the injection of the cooling water into the cooling water channel 20, for example, the molten resin is filled in the cavity. The molding cycle time can be shortened as compared with the case where the cooling water injection is started after.

  The time until the convex portion 12a of the second mold 12 reaches the predetermined temperature by the cooling water can be shortened as the temperature of the cooling water is lowered. Moreover, the lower the temperature of the cooling water, the lower the predetermined temperature (temperature for stopping the injection of cooling water) set for the convex portion 12a of the second mold 12 can be reduced. The time required for solidification of the filled molten resin can be shortened. Therefore, the temperature of the cooling water is preferably set as low as possible within the range in which the fluidity is not hindered in consideration of the fluidity of the molten resin being injected into the cavity of the mold.

  Next, as shown in FIG. 4, the injection of compressed gas is stopped, and the first mold 11 is further moved in the mold closing direction to clamp the mold.

  Next, as shown in FIG. 5, the molten resin 23 is injected and filled into the cavity 22 formed by the first mold 11 and the second mold 12 from the resin injection path 12 b of the second mold 12. . The filled molten resin 23 is cooled and solidified.

  Finally, as shown in FIG. 6, the first mold 11 is moved in the mold opening direction to open the mold. Thereby, the molded product 24 having the transfer layer 13a transferred on the surface is obtained.

  The operation of the foil transfer injection molding apparatus described above can be realized by the control unit controlling the operation of the entire apparatus in accordance with a program preliminarily stored in the storage unit that defines the operation of the entire apparatus. .

  As described above, according to the first embodiment, the compressed gas is injected into the space sealed by the film 13, the movable block 15, and the second mold 12, so that the film 13 is moved from the second mold 12 side. The pressure received can be made higher than the pressure received from the first mold 11 side, and a force can be applied uniformly to the film 13 from the first mold 11 side. Therefore, the film 13 can be stretched uniformly and brought into close contact with the recess 11a of the first mold 11, and wrinkling and tearing of the film 13 can be suppressed. Therefore, it is possible to obtain a three-dimensional molded product having no wrinkles or tears on the surface.

  Further, according to the first embodiment, before the film 13 is stretched by the compressed gas, the film 13 is heated and softened to be easily stretched, so that the film 13 can be stretched more uniformly. Wrinkles and tears can be further suppressed.

  Furthermore, according to this Embodiment 1, since the compressed gas which stretches the film 13 is also heated, it can prevent that the temperature of the film 13 falls after the film 13 leaves | separates from the 2nd metal mold | die 12. it can. Therefore, wrinkles and tearing of the film 13 can be further suppressed.

  In addition, according to the first embodiment, the surface coating of a three-dimensional molded product currently performed by painting or surface treatment using a solvent can be realized by foil transfer injection molding. It is possible to solve environmental problems that have been emphasized in recent years.

(Embodiment 2)
Next, the second embodiment will be described. However, differences from the above-described first embodiment will be described, and description overlapping with the first embodiment will be omitted.

  First, using FIG. 7 to FIG. 9, in the foil transfer injection molding process described in the first embodiment, the change in the state of the film 13 from the state shown in FIG. 2 to the state in FIG. A little more detail will be explained along with the background.

  In the state shown in FIG. 2, when the injection of the compressed gas is started into the space sealed by the film 13, the movable block 15, and the second mold 12, a completely uniform pressure is applied to the film 13, as shown in FIG. Furthermore, the entire surface of the film 13 extends uniformly.

  Thereafter, the film 13 further expands, and the film 13 comes into contact with the bottom surface of the concave portion 11a of the first mold 11 as shown in FIG. The portion 25 of the film 13 that is in contact with the first mold 11 is less stretched than other portions of the film 13 due to the frictional force between the film 13 and the first mold 11.

  As shown in FIG. 9, the film 13 extends toward the corner 11b of the recess 11a of the first mold 11, and as shown in FIG. It is preformed in a state along 11a. Therefore, since the elongation of the portion of the film 13 facing the corner portion 11b of the concave portion 11a of the first mold 11 continues to the end, the elongation amount of the portion becomes larger than that of other portions.

  Thus, even in the first embodiment described above, a slight imbalance occurs in the elongation of the film 13.

  Therefore, in the second embodiment, as shown in FIG. 10, at least a part of the bottom of the concave portion 11a of the first mold 11 is constituted by the movable insert 26, and when injecting compressed gas, an actuator (not shown) The movable nest 26 is driven to retract so that the film 13 does not come into contact with the mold even when the film 13 is stretched. The film 13 is stretched by a predetermined amount, and a part of the film 13 reaches the space generated by the retraction of the movable nest 26. At this stage, the film 13 is moved to the original position as shown in FIG. 11 to preform the film 13 along the recess 11a of the first mold 11.

  According to the second embodiment described above, when the film 13 extends along the recess 11 a of the first mold 11, the film 11 extending toward the recess 11 a of the first mold 11 is the recess of the first mold 11. Since the movable insert 26 provided at the bottom of the recess 11a of the first mold 11 is moved in a direction to escape from the film 13 so as not to touch the bottom surface of the 11a, the entire film 13 can be stretched more uniformly. That is, since the film 13 can be uniformly stretched including the part of the film 13 facing the corner of the molded product, the stretch of the film 13 can be further uniformed. Therefore, it can be applied to a deep-drawn molded product as compared with the first embodiment described above.

  In the first and second embodiments described above, the case where only the second mold 12 that is the upper mold is movable and approaches and separates from the first mold 11 that is the lower mold has been described. Of course, the same can be applied to the case where only the first mold 11 which is the lower mold is movable, or the case where both the first mold 11 which is the lower mold and the second mold 12 which is the upper mold are movable. .

  In the first and second embodiments described above, the case where the transfer layer 13a is peeled off from the base material 13b and only the transfer layer 13a adheres to the surface of the molded product when the mold is opened has been described. In the case where a necessary part of the film is punched when the mold is clamped and the transfer layer is adhered to the surface of the molded product together with the base material, the same process can be performed.

  According to the foil transfer injection molding method, foil transfer injection molding apparatus, and mold according to the present invention, even if a three-dimensional molded product is foil transfer injection molded, wrinkles and tearing of the film can be suppressed. This is useful for molded products with a three-dimensional drawing.

DESCRIPTION OF SYMBOLS 1 Mold 2 Mold 3 Transfer film 4 Parting surface 5 Air suction part 6 Cavity formation part 7 Air intake hole 11 1st metal mold 11a Concave part 11b Corner part 12 2nd metal mold 12a Convex part 12b Resin injection path 13 Film 13a Transfer Layer 13b Substrate 14 Film feeder 15 Movable block 16 Spring 17 O-ring 18 Gas injection path 19 Heater 20 Cooling water path 21 Hot air unit 22 Cavity 23 Molten resin 24 Molded product 25 Part where film is in contact with mold 26 Movable Nesting

Claims (14)

A film is disposed between the first mold and the second mold, the film is preformed along the concave portion of the first mold, and the first mold and the second mold are clamped. Then, after injecting resin from a resin injection path provided in the second mold into a space formed by the first mold and the second mold, the first mold and the second mold are injected. The foil transfer injection molding method for transferring the transfer layer of the film to the surface of the molded product at the same time as the molded product is molded by opening the mold, and when the film is preformed,
The first mold and the second mold are brought close to each other, a frame-like movable block provided on the second mold is brought into contact with the first mold, and the first mold and the second mold are brought into contact with each other. A closed space is formed by the film disposed between the mold, the second mold, and the movable block;
Foil transfer injection characterized in that gas is injected into the sealed space from a gas injection path provided in the second mold, and the film is preformed along the recess of the first mold. Molding method.   When forming the sealed space, the convex portion provided in the second mold is brought into contact with the film, and the heat of the convex portion of the second mold heated by the film heating means is applied to the film. The foil transfer injection molding method according to claim 1, wherein heat transfer is performed.   3. The foil transfer injection molding method according to claim 2, wherein after the start of gas injection into the sealed space, cooling by a cooling means provided in the second mold is started.   The foil transfer injection molding method according to any one of claims 1 to 3, wherein hot air is used as the gas injected into the sealed space.   When injecting gas into the sealed space, a movable nest provided in the first mold is driven to retract at least a part of the bottom surface of the recess of the first mold, and the recess is formed. 5. The film according to claim 1, wherein a part of the film reaches the original space and then returns to the original position, and the film is preformed along the concave portion of the first mold. The foil transfer injection molding method described. A film is disposed between the first mold and the second mold, and the film is preformed along the recess of the first mold, and then the first mold and the second mold are mounted. After mold clamping, resin is injected and injected into a space formed by the first mold and the second mold from a resin injection path provided in the second mold, and then the first mold and the mold A foil transfer injection molding apparatus for transferring the transfer layer of the film to the surface of the molded product simultaneously with molding the molded product by opening the second mold.
When the first mold and the second mold approach the second mold, the first mold comes into contact with the first mold, and is disposed between the first mold and the second mold. Together with the film and the second mold, a frame-shaped movable block that forms a sealed space, and a gas injection path for injecting gas into the sealed space,
A foil transfer injection molding apparatus, wherein the film is preformed along the concave portion of the first mold by injecting a gas from the gas injection path into the sealed space.   The second mold is provided with a convex portion that contacts the film when the sealed space is formed, and a film heating means that heats the convex portion, and the convex portion of the second mold The foil transfer injection molding apparatus according to claim 6, wherein the film in contact is heated.   8. The foil transfer injection molding apparatus according to claim 7, wherein a cooling means is provided in the second mold, and cooling by the cooling means is started after the start of gas injection into the sealed space.   The foil transfer injection molding apparatus according to any one of claims 6 to 8, further comprising gas heating means for applying heat to the gas injected into the sealed space.   The first mold is provided with a movable nest that forms at least a part of the bottom of the recess of the first mold, and the movable nest is retreated, and a part of the film is formed in the space formed by the retreat. However, after reaching by the gas injection into the sealed space, the movable nest is returned to the original position, and the film is preformed along the recess of the first mold. Item 10. The foil transfer injection molding apparatus according to any one of Items 6 to 9. It consists of a pair of first mold and second mold,
In the second mold,
When the first mold and the second mold approach and come into contact with the first mold, the film disposed between the first mold and the second mold and the second mold A frame-shaped movable block that forms a sealed space, and
A gas injection path for injecting gas into the sealed space;
A resin injection path for injecting resin into a space formed by clamping the first mold and the second mold;
A mold characterized by providing.   12. The second mold is provided with a convex portion that comes into contact with the film when the sealed space is formed, and a film heating unit that heats the convex portion. Mold.   The mold according to claim 12, wherein a cooling means is provided in the second mold. The mold according to any one of claims 11 to 13, wherein the first mold is provided with a movable nest that forms at least a part of the bottom of the recess of the first mold.

Images