JPH05200779A - Simultaneous injection molding and transfer method and its device - Google Patents

Abstract

PURPOSE:To clamp a transfer film to a mold by uniform strength and simplify mold structure. CONSTITUTION:A transfer film 2 possessing a transfer layer is sent into a space between a pair of molds 1 constituted of a mold A11 and mold B12 and after the transfer film 2 is fixed to a predetermined position of the mold by a clamping member 4, the mold is clamped, molten resin is injected, cooled and the mold is broken. In a simultaneous injection molding and transfer method through which a molded product 17 on the surface of which the transfer layer is formed is obtained, electromagnetic force is caused to be generated on a magnet 5 built in to mold A11, the clamping member 4 comprised of a magnetic substance on which a movable arm 41 is mounted is magnetized, attracted toward the mold A11 and the transfer film 2 is clamped.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an injection molding simultaneous transfer method and apparatus capable of clamping a transfer film to a mold with uniform strength and simplifying the structure of the mold.

[0002]

2. Description of the Related Art Conventionally, a pair of molds composed of a female mold and a male mold, a transfer film feeding device for feeding a transfer film between the molds, a clamp bar provided on the female mold surface and a female mold surface. There is an injection molding simultaneous transfer device that clamps a transfer film by sandwiching it with and. In this device, the transfer film is clamped between the clamp bar and the female mold while pressing the clamp bar protruding on the female mold against the surface of the female mold by the action of the push rod provided on the male mold, and when the mold is closed The bar fits into the male recess (see FIG. 8).

[0003]

However, conventionally, since the rods supporting both ends of the clamp bar are projected from the female die surface, it is necessary to avoid the transfer film passing surface to provide the rods. Therefore, if the width of the transfer film is wide and the passing surface is large and the distance between the rods that apply force to the clamp bar becomes long, the center of the clamp bar tends to be bent due to its own weight to create a gap during clamping. It was not possible to clamp the part evenly (see FIG. 9).

Further, since the female clamp bar must be fitted in the male mold, a complicatedly changed shape is formed such as forming a recess on the mating surface (parting surface) between the female mold and the male mold. Must be (see Figure 8).

Further, since a spring for operating the clamp bar and rods serving as fulcrums at both ends of the clamp bar must be built in the mold, the structure of the mold becomes very complicated and large (see FIG. 8).

Further, when the mold type uses a slide core, since the slide core interferes with the rod, there are restrictions in the design of the mold structure and it is difficult to undercut the molded product. ..

[0007]

In order to achieve the above object, the molding simultaneous transfer method of the present invention has a mold A and a mold B.
A transfer film having a transfer layer is fed between a pair of molds consisting of, and the transfer film is fixed at a predetermined position with respect to the mold by a clamp member, and then the mold is closed. By injecting and cooling and opening the mold,
In the injection molding simultaneous transfer method for obtaining a molded article having a transfer layer formed on the surface thereof, a clamp member capable of moving in and out between molds and a mold are suction-adhered by an electromagnet to clamp the transfer film.

Further, the molding simultaneous transfer apparatus of the present invention comprises a pair of molds composed of a mold A and a mold B, a transfer film feeding device for feeding a transfer film between the molds, and the transfer film as a mold. In an injection molding simultaneous transfer device having a clamp member to be fixed, the clamp member is installed on the movable arm, and the mold A is further configured to include an electromagnet for suction-adhering the clamp member.

Further, the molding simultaneous transfer apparatus of the present invention comprises a pair of molds composed of a mold A and a mold B, a transfer film feeding device for feeding a transfer film between the molds, and the transfer film as a mold. In the injection molding simultaneous transfer device having the clamp member to be fixed, the clamp member may be configured so as to be installed in the movable arm and further incorporate an electromagnet for attracting and closely contacting the mold.

In the molding simultaneous transfer device of the present invention, the entire clamp member may be made of a magnetic material.

Further, in the molding simultaneous transfer device of the present invention, the clamp member may be constructed so as to be partially made of a magnetic material.

Further, in the molding simultaneous transfer device of the present invention, the clamp member may have a heating device for the transfer film.

Further, in the molding simultaneous transfer apparatus of the present invention, the clamp member may be a box body which forms a closed space with the mold A.

Further, in the molding simultaneous transfer apparatus of the present invention, the clamp member may be constructed so as to have a compressed air hole for feeding gas. .

Further, the simultaneous molding transfer device of the present invention may be configured such that the cavity forming portion of the mold A is provided with an intake hole.

Further, the molding simultaneous transfer device of the present invention may be configured to have a molded product take-out device on the surface of the clamp member on the side of the mold B.

[0017]

The present invention will be described in more detail with reference to the drawings. 1 to 4 are sectional views showing an operation of an embodiment of the present invention, FIG. 5 is a front view of a mold A into which a transfer film of the present invention has been fed, and FIG. 6 is a sectional view showing another embodiment. FIG. 7 is a perspective sectional view showing the clamp member of the present invention.

First, the molding simultaneous transfer device of the present invention will be described. The mold 1 includes a mold B12 and a mold A11. A cavity is formed by closing the mold B12 and the mold A11, and molten resin is injected into the cavity. The mold 1 may be used in a horizontal injection molding machine or may be used in a vertical injection molding machine.

The mold A11 has a cavity forming portion 14, and an electromagnet 5 is built in the outer peripheral portion of the cavity forming portion 14, that is, the parting surface with which the clamp member 4 abuts. Since the electromagnet 5 can be arranged so as to overlap the passage surface of the transfer film 2 (see FIG. 5), it can be clamped near the cavity forming portion 14. The electromagnet 5 is supplied with electricity by an electric cable 51. Further, when it is difficult to release the clamp due to the large residual magnetism of the die A11 and the clamp member 4, the electromagnet 5 is electrically operated to completely erase the residual magnetism or generate a repulsive force to release the clamp. You can also do it.

Further, the transfer film 2 is sucked onto the cavity forming portion 14 or the parting surface, and the mold A11 is used.
Intake hole 1 to be preformed in the shape of the cavity forming portion 14 of
5 may be provided and connected to the intake passage 16 (see FIG. 1). The electromagnet 5 may be built in the clamp member 4 instead of being built in the mold. The mold B12 has a molten resin injection hole 13 and is connected to an injection molding machine.

The transfer film 2 fed between the molds is
It has a transfer layer on a long base film.
The transfer layer is formed by sequentially laminating a peeling layer, a pattern layer, an adhesive layer and the like. The release layer is a layer that imparts releasability between the base film and the transfer layer. The pattern layer is a layer that imparts decorativeness and functionality to the surface of the molded product. There are ordinary printed patterns and conductive patterns formed of conductive materials. The adhesive layer is a layer for adhering the transfer layer and the molded product.

The transfer film 2 may be one in which the base material film is peeled off after being adhered to the surface of the molded product 17 and only the transfer layer is transferred to the surface of the molded product 17. Alternatively, by closing the mold, a necessary portion of the transfer film 2 may be punched out and the transfer layer may be transferred together with the base film onto the surface of the molded product.

The transfer film feeding device 3 is a device for feeding the transfer film 2 between the molds at a predetermined pitch. A transfer film feed roll is provided above the mold, and a transfer film take-up roll is provided below the mold. The transfer of the transfer film at a predetermined pitch is controlled by a stepping motor (not shown) attached to the rotation shaft of the transfer film feed roll or the rotation shaft of the transfer film take-up roll, and the rotation of each roll is controlled. It is preferable to control the rotation of a pair of guide rolls located between the roll and the transfer film take-up roll. In order to feed the transfer film 2 accurately at a predetermined pitch, a method of detecting the mark provided on the transfer film 2 by a photoelectric tube sensor (not shown) and controlling the feeding of the transfer film 2 may be applied.

The clamp member 4 presses the transfer film 2 against a mold to clamp it at a predetermined position. The clamp member 4 is attached to the tip of the movable arm 41 that can move in and out between the molds. The clamp member 4 is
An electromagnet 5 for generating and extinguishing the attraction force with the mold may be incorporated (see FIG. 6).

The clamp member 4 is a frame-shaped member that comes into contact with a portion surrounding the cavity forming portion 14 of the mold A11 (see FIG. 5). When the molded product is small, a double mold that abuts only at two upper and lower portions of the cavity forming portion 14,
It may have a U-shape so as to abut two upper and lower portions and one horizontal portion. Further, the clamp member 4 may be a box that forms a closed space with the cavity forming portion 14 of the mold A11 (see FIG. 7).

Further, the entire clamp member 4 can be made of a magnetic material. By doing so, the entire clamp member 4 is magnetized by the electromagnet 5, so that the attraction force with the die A11 can be given to the whole.

Alternatively, the magnetic body may be partially balanced and arranged on the clamp member 4 made of a lightweight material that is not a magnetic body. Even if the clamp member 4 is large, the weight of the metal magnetic body is small, so that it is not heavy as a whole, which is effective.

Alternatively, electromagnets may be spread over the entire surface of the clamp member 4. By doing so, the entire clamp member 4 becomes an electromagnet, and the magnetic attraction force can be generated and eliminated over the entire clamp member 4.

The clamp member 4 is the transfer film 2
A heating device 42 for heating the mold may be provided so as to face the mold A11. In addition to the heating plate, the heating device 42 includes a heat pipe and a heating wire (see FIG. 7) arranged in a meandering shape. When the entire clamp member 4 is made of a magnetic material, the entire weight becomes large, and therefore the weight can be reduced by using a heat pipe or a heating wire as the heating device 42. Clamp member 4
Is a box that forms a closed space with the cavity forming portion 14 of the mold A11, the clamp member 4 is provided with a compressed air hole 44 for feeding gas into the closed space.
Are connected to the compressed air pipe 45. An O-ring 18 may be provided in a portion of the mold A11 that abuts the clamp member 4 in order to improve the degree of airtightness.

A molded product take-out device 43 such as a suction cup may be provided on the side of the clamp member 4 facing the mold B12.

The clamp member 4 and the moving arm 41 are formed of a spring 4 which expands and contracts due to the generation and disappearance of the attractive force of the electromagnet 5.
6 and the rail 47 are preferably connected (see FIGS. 1 to 3). With this configuration, when the electromagnet 5 has no attraction force, the elastic force of the spring 46 causes the clamp member 4 to be pulled toward the mold B12 (see FIG. 1), and then the electromagnet 5 is attracted. When force is generated,
Only the clamp member 4 slides on the rail 47 and is drawn to the mold A11 while the position of the moving arm 41 remains unchanged (see FIG. 2). Further, when the attractive force of the electromagnet 5 disappears, the elastic force of the spring 46 causes the clamp member 4 to move.
Slides on the rail 47 again and is drawn to the mold B12 side. A hydraulic cylinder or an air cylinder may be used instead of the spring 46.

Next, the molding simultaneous transfer method of the present invention will be described. First, the clamp member 4 is inserted between a pair of molds including the mold B12 and the mold A11 in the mold open state. In parallel, the transfer film feeding device 3 feeds the long transfer film 2 having the transfer layer on the base film at a predetermined pitch between the molds. When the transfer film 2 reaches the predetermined position, the film feeding is stopped (see FIG. 1).

Next, the clamp member 4 is moved to the parting surface side of the mold A11 and stopped when the mold A11 approaches a predetermined distance (see FIG. 1). If necessary, the molded product take-out device 43 mounted on the mold B12 side of the clamp member 4 may hold the molded product 17 attached to the surface of the mold B12 (see FIG. 2).

Next, a current is supplied to the electromagnet 5 to generate a magnetic attraction force between the electromagnet 5 and the surface of the mold A, and the clamp member 4
The transfer film 2 is clamped by sandwiching it with the mold A11. If necessary, the transfer film 2 may be heated and softened by the heating device 42 mounted on the mold A side of the clamp member 4 in the sandwiched state (see FIG. 2). Also, if necessary, the transfer film 2 softened by sucking it through an air intake hole 15 formed on the parting surface of the mold A11 or by sending gas through a compressed air hole 44 provided in the clamp member 4 is used as a cavity of the mold A11. The transfer film 2 may be preformed by pressing it against the surface (see FIG. 3).

Next, the attraction force of the electromagnet 5 is extinguished, and the clamp member 4 is taken out from between the molds. If necessary, the suction force may disappear and the spring 46 attached to the clamp member 4 may urge the clamp member 4 and the mold A11 to be separated from each other (see FIG. 3).

Next, with the transfer film 2 in close contact with the surface of the cavity of the mold A11, the mold A11 and the mold B1
2 is closed and molten resin is injected into the mold to form the molded product 17 and at the same time, the pattern of the transfer layer of the transfer film 2 and the functional thin film are provided on the surface of the molded product 17 (see FIG. 4).

[0037]

According to the simultaneous injection molding transfer method and apparatus of the present invention, the transfer film is clamped by bringing the clamp member, which can move in and out between the molds, and the mold into close contact with each other by the electromagnet.

Therefore, since the mold sucks the clamp member through the transfer film, the transfer film can be clamped with a uniform strength regardless of the size of the passing surface of the transfer film.

Further, since it is not necessary to provide a protrusion such as a clamp bar, the mating surface of the mold does not have a complicatedly changed shape.

Further, since the spring and the rod do not have to be built in, the structure of the mold is very simple and compact. Also,
Since the slide core can be arranged arbitrarily, the undercut process of the molded product can be easily performed.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an embodiment of a molding simultaneous transfer method and apparatus according to the present invention.

FIG. 2 is a cross-sectional view showing an operation of an embodiment of the molding simultaneous transfer method and apparatus of the present invention.

FIG. 3 is a sectional view showing an operation of an embodiment of the molding simultaneous transfer method and apparatus of the present invention.

FIG. 4 is a sectional view showing an operation of one embodiment of the molding simultaneous transfer method and apparatus of the present invention.

FIG. 5 is a front view of the mold A into which a transfer film is fed by the molding simultaneous transfer device of the present invention.

FIG. 6 is a sectional view showing another embodiment of the present invention.

FIG. 7 is a perspective sectional view showing a clamp member of the present invention.

FIG. 8 is a conventional molding simultaneous transfer method and apparatus.

FIG. 9 is a front view of a female mold in which a transfer film is fed by a conventional molding simultaneous transfer device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Mold 2 Transfer film 3 Transfer film feeding device 4 Clamping member 5 Electromagnet 11 Mold A 12 Mold B 13 Injection hole 14 Cavity forming part 15 Intake hole 16 Intake passage 17 Molded product 18 O-ring 41 Moving arm 42 Heating device 43 Molded product take-out device 44 Compressed air hole 45 Compressed air pipe 46 Spring 47 Rail 51 Electric cable

Claims (10)

[Claims] 1. A transfer film having a transfer layer is fed between a pair of molds composed of a mold A and a mold B, and the transfer film is fixed at a predetermined position with respect to the mold by a clamp member. In the injection simultaneous transfer method, in which the mold is closed, the molten resin is injected into the mold, the mold is opened after cooling, and the mold is opened. An injection molding simultaneous transfer method, characterized in that a member and a mold are attracted and adhered by an electromagnet to clamp the transfer film. 2. An injection molding having a pair of molds composed of a mold A and a mold B, a transfer film feeding device for feeding a transfer film between the molds, and a clamp member for fixing the transfer film to the molds. In the simultaneous transfer device, the clamp member is installed on a movable arm, and the mold A further includes an electromagnet for attracting and closely contacting the clamp member. 3. An injection molding having a pair of molds composed of a mold A and a mold B, a transfer film feeding device for feeding a transfer film between the molds, and a clamp member for fixing the transfer film to the molds. In the simultaneous transfer device, a clamp member is installed on a movable arm, and further, an electromagnet for sucking and closely contacting a mold is built therein, which is an injection molding simultaneous transfer device. 4. The simultaneous injection molding transfer device according to claim 2, wherein the entire clamp member is made of a magnetic material. 5. The injection molding simultaneous transfer device according to claim 2, wherein the clamp member is partially made of a magnetic material. 6. The injection molding simultaneous transfer device according to claim 2, wherein the clamp member includes a transfer film heating device. 7. The injection molding simultaneous transfer device according to claim 2, wherein the clamp member is a box body that forms a closed space with the mold A. 8. The simultaneous injection molding transfer device according to claim 2, wherein the clamp member has a pressure hole for feeding gas. 9. The simultaneous injection-molding transfer device according to claim 2, wherein the cavity forming portion of the mold A is provided with an intake hole. 10. The simultaneous injection molding transfer device according to claim 2, further comprising a molded product takeout device on the surface of the clamp member on the side of the mold B.