JP2001293776A - Film preforming apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To keep a temperature of a heated film from decreasing. SOLUTION: A film pre-forming apparatus 4 is provided with film adhesion means, a frame-shaped clamp 2 and exhausting means 4 arranged in this order, wherein there is provided a heating apparatus for heating a film 5 placed on the frame-shaped clamp 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention
Related to a film preform apparatus for obtaining a film that has been formed into a three-dimensional shape in order to integrate the film with the surface of a three-dimensional molded product such as an instrument panel of an automobile, a button or a knob used for the panel, and the like. It is.

[0002]

2. Description of the Related Art In a conventional film preform apparatus, there is an apparatus in which a compressed air means, a frame-shaped clamp, a convex shape, and an exhaust means are arranged in this order. However, in this film preform apparatus, the film is heated at a location remote from the film preform apparatus, and then moved by a robot hand or the like and placed on the frame-shaped clamp. afterwards,
By closing the compressed air means and the exhaust means, and press-fitting compressed air from the compressed air means, the film is brought into complete contact with the convex shape at a stretch without any gaps, and the film is formed three-dimensionally (hereinafter, referred to as "the three-dimensional structure").
It is called "preform". )Was. The shape for forming the film three-dimensionally is a shape that substantially matches the shape of the outer surface or inner surface of the cavity forming surface of the injection mold. In order to obtain an integrated product with a three-dimensional molded product using the preformed film obtained in this way, a film obtained by trimming unnecessary portions is transported to an injection molding die, and a cavity forming surface of the injection molding die is formed. Then, the fixed mold and the movable mold are closed to form a cavity, the molding resin is injected into the cavity, and after the molding resin cools and solidifies, the surface of the three-dimensional molded product is removed from the injection mold. Take out the finished product with integrated film. If the shape of the preformed film does not match the cavity forming surface, a defective product having wrinkles in the film is formed.

[0003]

Conventionally, there have been the following problems. (1) Since the heated film must be moved from the heating device to the film preform device, wind is applied to the film when moving. Therefore, (a) Since the temperature of the heated film is rapidly reduced, it is difficult to completely adhere the film to the convex shape unless the pressure of the compressed air is set high from the compressed air means. (B) Since the temperature of the heated film suddenly decreases, the pattern is suddenly displaced or distorted due to shrinkage of the film. (2) Since the heated film must be moved from the heating device to the film preform device, compressed air cannot be injected from the compressed air means immediately after heating the film. Therefore, the transition between each process takes time,
Poor production efficiency. (3) Since the heated film must be moved from the heating device to the film preform device, a device for moving the film, such as a robot or a conveyor belt, is required. For this reason, space and cost for preparing a large-scale apparatus other than the film preform apparatus are increased.

[0004]

In order to solve the above-mentioned problems of the prior art, the present invention is configured as follows.
That is, the film preform apparatus of the present invention is a film preform apparatus in which the film contacting means, the frame-shaped clamp, the convex shape, and the exhaust means are arranged in this order,
It has a heating device capable of heating the film placed on the frame clamp.

That is, the film preform apparatus of the present invention is a film preform apparatus in which a film contacting means, a frame-shaped clamp, a convex shape, and an exhaust means are arranged in this order. It enters the gap between the clamp and the gap between the frame-shaped clamp and the convex mold and covers the upper and lower surfaces of the film placed on the frame-shaped clamp and heats the film. And a heating device capable of retracting from the gap until the two are combined.

[0006] In the film preform apparatus of the present invention, the heating apparatus may be composed of a plurality of divided heating sections capable of setting different temperatures.

Further, in the film preform apparatus of the present invention, the frame-shaped clamp may be provided with a heater panel or a temperature control circuit.

Further, in the film preform apparatus of the present invention, two or more tapered pins are formed on the upper surface of the exhaust means, and a bush corresponding to the pins is formed on the lower surface of the frame-shaped clamp. Two or more film positioning pins may be formed on the upper surface.

Further, the film preform apparatus of the present invention comprises a film holding portion for removing the preformed film from a gap between the film contacting means and the frame-shaped clamp, and a frame-shaped clamp for removing the non-preformed film. It may have a robot hand in which a film holding unit to be placed on top is placed back to back.

[0010]

Embodiments of the present invention will be described below in detail with reference to the drawings. The film preform apparatus comprises at least a film contacting means and a frame-shaped clamp 2
And the convex 3 and the exhaust means 4 are arranged in this order. As the film adhesion means, one using the compressed air means 1 alone, one using the vacuum forming means alone, one using both the compressed air means 1 and the vacuum forming means, and inserting the film between the upper and lower bases Press forming means for press forming. As the compressed air means 1, there is an apparatus generally used for air blow molding. Hereinafter, a case where the compressed air means 1 is used alone will be described.

The compressed air means 1 cooperates with the frame-shaped clamp 2 to fix the periphery of the film 5, moves so as to cover the convex portion 7 of the convex mold 3 with the film 5, and exhausts the film 5 with the film 5 interposed therebetween. After being combined with the compressed air 4, compressed air is pressed into the compressed air through the compressed air holes 6 to bring the film 5 into close contact with the convex portions 7 of the convex mold 3 without gaps. The compressed air means 1 is connected to an air compressor 8 for producing compressed air. The pressure of the compressed air is preferably from 15 to 50 atm. According to the present invention, the compressed air can be injected from the compressed air holes 6 while the film 5 is heated at a high temperature.
Can be adhered to each other. As a specific example of the set value of the pressure of the compressed air, when using a laminated film having a total thickness of 500 μm of the ABS film and the acrylic film,
A set value of 20 atm at a heating temperature of 250 ° C. is preferred. In the case of a polybutylene terephthalate film having a thickness of 200 μm, a set value of 45 atm at a heating temperature of 250 ° C. is preferable. The material of the compressed air means 1 is iron,
There are metals or alloys such as aluminum and copper. The reason for this is that strength is required to withstand the press-fitting of compressed air. The cavity 9 of the compressed air means 1 is a space that does not interfere with the convex portion 7 of the convex 3 when it is combined with the convex 3 described later.

The frame-shaped clamp 2 is fixed to the periphery of the film 5 in cooperation with the compressed air means 1 and moves so as to cover the film 3 on the convex mold 3 (see FIG. 7). The material of the frame-shaped clamp 2 may be the same as the material of the compressed air means 1. The shape of the frame-shaped clamp 2 includes a planar shape and a three-dimensional shape. The frame-shaped clamp 2 includes a film 5
An upper clamp that presses from the upper surface of the film 5 and a lower clamp that presses from the lower surface of the film 5 may sandwich the film 5 between these two clamps (not shown). In this way, even if the film 5 is heated by the heating device 10, the predetermined annular portion of the film 5 is fixed, so that even when the film 5 is misaligned, contracted, or stretched, it can be minimized. . The clamp may be splittable (not shown). For example, there is an unbroken square frame-shaped clamp 2 before division, and two U-shaped clamp pieces after division. The frame-shaped clamp 2 is a heating device for clamping,
Alternatively, a temperature control circuit (not shown) using a heated fluidized medium may be attached. The reason is that the heat of the film 5 is deprived by the frame-shaped clamp 2 and the temperature distribution of the film 5 becomes non-uniform, and the degree of stretching of the film 5 varies when the film 5 is brought into close contact with the convex protrusion. This is to prevent a portion having a low degree of stretching from being torn and a portion having a high degree of stretching from being wrinkled. Further, the temperature of the film 5 is prevented from lowering after the heating device 10 is retracted, or the temperature of the film 5 is prevented from lowering due to the wind hit when the film 5 moves toward the convex 3. To do that. As the clamp heater device, there is a rod-shaped sheathed heater 34 or the like, which is preferably embedded in two opposing pieces of the frame-shaped clamp 2 (FIGS. 7A and 7B). As the temperature control circuit, a structure in which heated water is drawn into the inside of the frame-shaped clamp 3 from an external device capable of heating and controlling the temperature of a fluid medium such as water and circulated through the inside of the frame-shaped clamp 3. There are things. The frame-shaped clamp 2 has a tapered pin 12 formed on the upper surface of the exhaust means 4 on the lower surface thereof.
(See FIGS. 7A and 7B and FIGS. 9 to 13). Frame clamp 2
This is to prevent the projection 7 of the projection 3 and the picture of the film 5 from being displaced when the projection 3 and the exhaust means 4 are combined. The bush 13 is preferably formed at least at the center of two opposing sides of the frame-shaped clamp 2. The frame-shaped clamp 2 has two or more film positioning pins 3 on its upper surface.
2 may be formed (FIG. 7B, FIGS. 9 to 13).
reference). This is to prevent the frame clamp 2 and the picture of the film 5 from being displaced. The tapered pin 1
With the use of the bush 13, the bush 13, and the film positioning pin 32, it is possible to prevent the picture of the film 5 from being displaced from the projection 7 of the projection 3. Film positioning pin 3
The number of 2 is 2 or more, preferably 4 to 8. This is to minimize positional deviation in the left, right, up, and down directions. The location of the film positioning pin 32 is as follows.
A central portion or a corner portion of each side of the frame-shaped clamp 2 is preferable. The length of the film positioning pin 32 is 5 to 1
0 mm is preferred. The diameter of the film positioning pin 32 is
A diameter of 2 to 8 mm is preferred.

The convex mold 3 is used for deforming the film 5 into a three-dimensional shape which substantially matches the shape of the cavity forming surface of the injection mold described later, by closely adhering the film 5 to the surface thereof. (See FIG. 8). The convex mold 3 may be provided with a small hole or a slit 33 in the vicinity of the convex portion 7, or may have a fine air hole through which air passes. Porous metals, porous ceramics, and the like include fine air holes through which the protrusions themselves have air. The protrusion 3 may have a plurality of protrusions 7 (see FIG. 8). Each one of the projections 7 may have the same three-dimensional shape of the top cover of the mobile phone with the same rising. The plurality of convex portions 7 may have different rising three-dimensional shapes.

After the film 5 covers the convex portion 7 of the convex 3, the exhaust means 4 removes the air in the gap between the film 5 and the convex 7 of the convex 3 which is pushed out by the compressed air from the compressed air means 1. The film 5 is exhausted from the exhaust hole 14 so that the film 5 is closely attached to the convex portion 7 of the convex mold 3 without any gap. The exhaust means 4 may have a tapered pin 12 that matches a bush 13 formed on the frame-shaped clamp 2 (FIG. 7).
(B), see FIGS. 9 to 13). Frame clamp 2 and convex 3
The projection 7 and the film 5 are combined when the
This is to prevent the pattern from being displaced.

In this embodiment, the relationship between the components other than the heating device 10 is as follows (FIGS. 1 to 5 and FIG. 9).
To FIG. 13). The convex mold 3 is installed on the exhaust means 4 fixedly installed on the ground, and is fixed with a bolt or the like so as not to be displaced. Above the convex mold 3, the frame-shaped clamp 2 is installed. The frame-shaped clamp 2 is supported by the frame-shaped clamp support portion 15 and is always resilient in a direction away from the exhaust means 4 by a spring or an air cylinder. It is stationary with a certain gap. The gap has an interval into which a lower heating unit 17 of the heating device 10 described below can enter. Further, the compressed air means 1 is further provided with a fixed gap B with the frame-shaped clamp 2 via the compressed air means supporting portion 16.
And keep waiting. This gap has an interval into which the upper heating unit 18 of the heating device 10 described below can enter. The compressed air means 1 is pushed down or pulled up by a hydraulic cylinder 19 or the like via the compressed air means support portion 16.

After the film 5 is heated, the compressed air means 1, the frame-shaped clamp 2, the convex mold 3, and the exhaust means 4 change from a state having the gap to a state of being united, and return to a state having the gap again. A series of operations up to the return will be described (FIGS. 9 to 13). First, the compressed air means 1 is pushed down by the hydraulic cylinder 19 to a fixed position of the frame-shaped clamp 2,
The film 5 is fixed by being combined with the frame-shaped clamp 2 (FIG. 1).
0). The compressed air means 1 moves along posts 20 provided on all sides via a compressed air means support portion 16. next,
By pressing the compressed air means 1 further downward by the hydraulic cylinder 19, the frame-shaped clamp 2 is moved downward from the fixed position, and the compressed air means 1, the film 5 and the frame-shaped clamp 2 are combined with the exhaust means 4 Approach. The united state can be maintained during the approach because the frame-shaped clamp 2 is constantly resilient in the upward direction. By pressing the compressed air means 1 further downward by the hydraulic cylinder 19, the compressed air means 1, the film 5 and the frame-shaped clamp 2 are pressed.
And the convex 3 and the exhaust means 4 are united (see FIGS. 11 and 12). Although the film 5 covers the convex portion 7 of the convex 3, a so-called tent is stretched, and a gap remains between the film 5 and the convex portion 7. Next, compressed air is pressed into the film 5 from the compressed air holes 6 of the compressed air means 1,
The air in the gap between the film 5 and the convex 3 is pushed out from the exhaust hole 14 of the exhaust means 4 to bring the film 5 into close contact with the convex 3 (see FIG. 12). Next, until the plastic deformation of the film 5 is completed, the compressed air is maintained, and then the air on the compressed air means side is exhausted. Next, the compressed air means 1 is raised by the hydraulic cylinder 19 to a fixed position of the frame-shaped clamp 2. Further, when the compressed air means 1 is raised, the frame-shaped clamp 2
Stops at a fixed position, and only the compressed air means 1 further rises (see FIG. 13). Compressed air means 1, frame clamp 2, and convex 3
And the exhaust means 4 return to the state having the gap again.

As an example of the heating device 10, the compressed air means 1
Into the gap between the frame-shaped clamp 2 and the gap between the frame-shaped clamp 2 and the convex mold 3 to cover the upper and lower surfaces of the film 5 placed on the frame-shaped clamp 2 and to heat the compressed air. Some clamps can be retracted from the gap until the clamp 2, the convex 3 and the exhaust means 4 are united (see FIGS. 1 to 6). The heating device 10 may be composed of a heating unit 21 having only the upper heating unit 18 and having a one-shaped cross section, and a driving unit 22 for driving the heating unit 21. In this case, the heating is performed by covering only the upper surface of the film 5 placed on the frame-shaped clamp 2 by entering the gap between the film-adhering means and the frame-shaped clamp 2. The heating device 10 includes a heating unit 21 having only a lower heating unit 17 and a one-shaped cross section, and a heating unit 2.
1 and a drive unit 22 that drives the drive unit 1. In this case, only the lower surface of the film 5 placed on the frame-shaped clamp 2 by entering the gap between the frame-shaped clamp 2 and the convex mold 3 is heated. The heating device 10 includes a heating unit 21 having a U-shaped cross section having an upper heating unit 18 and a lower heating unit 17, and a driving unit 22 for driving the heating unit 21. The upper heating unit 18 has an area covering the upper surface of the frame clamp 2, and the lower heating unit 17 has an area covering the lower surface of the frame clamp 2. Since the frame-shaped clamp 2 is frame-shaped, heat from the lower heating unit 17 reaches the film 5 without fail. The upper heating unit 18 and the lower heating unit 17 may be the heater panel 11, or may be a ceramic heater in which the heater is cast in a ceramic plate, a pipe heater, or a hot air sprayer that blows out hot air. .
Since the heating device 10 has the lower heating section 17, the film 5 and the convex 3 can be heated simultaneously.
The heating unit 21 may be composed of a plurality of divided heating units 23 (the heater panel is divided into four) capable of setting different heating temperatures (see FIG. 6). When the above-mentioned convex mold 3 has a plurality of convex portions 7, one divided heating section 23 may correspond to one convex portion 7. Further, while the temperature setting of the divided heating unit 23 corresponding to the convex portion 7 having a large rise of the three-dimensional shape is increased, the temperature setting of the divided heating portion 23 corresponding to the convex portion 7 having a small rise of the three-dimensional shape is decreased. Good. The driving unit 22 is installed on the heating device mounting table 24, and the driving unit 22 moves on the rail 25 of the heating device mounting table 24 using the driving force of an actuator by air such as a rodless cylinder. There are things that move. Alternatively, a driving force of an electric actuator such as a combination of a motor and a timing belt, or a combination of a motor and a ball screw may be used. By covering the periphery of the portion where the compressed air means 1, the frame-shaped clamp 2, the convex mold 3, and the exhaust means 4 are arranged in this order with a plate-shaped enclosure, the inflow of air from the outside can be prevented, It is possible to prevent the temperature of the film 5 from decreasing during the period from the heating of the film 5 by the device 10 to the pressing of the film 5 by the compressed air from the compressed air means 1.

In the above film preform apparatus,
When fixing the film 5 with the compressed air means 1 and the frame-shaped clamp 2, a cutting blade, a heat cutter, and a laser beam cutting device for removing an unnecessary portion of the film 5 are provided in the compressed air means 1 and the frame-shaped clamp 2. (Not shown). Alternatively, when the film 5 is brought into close contact with the convex portion 7 of the convex 3 without any gap, a cutting blade, a heat cutter, or a laser beam cutting device for removing an unnecessary portion of the film 5 is provided on the surface of the convex 7 of the convex 3. Alternatively, it may be provided in the exhaust means 4 (not shown).

The injection molding die having a cavity forming surface conforming to the three-dimensional shape of the convex part 7 of the convex mold 3 forms a desired three-dimensional molded product by closing the male mold and the female mold. (Not shown). The film 5 formed three-dimensionally by the film preform apparatus of the present invention is used by fitting or covering the cavity forming surface. As the three-dimensional shape of the cavity forming surface, there is a three-dimensional shape of an upper lid of a mobile phone.

In the film preforming apparatus of the present invention, a preformed film holding portion for removing the preformed film 5 from the gap between the compressed air means 1 and the frame-shaped clamp 2, and a non-preformed film 5 may be provided with a robot hand 29 in which a non-preformed film holding portion for mounting the frame 5 on the frame-shaped clamp 2 is arranged back to back (FIG. 1, FIG.
5 and 14). The operation of the robot hand 29 will be described. First, while holding the film 5 on the suction cup with the film holding part that has not been preformed upward, and the film holding part that has been preformed downward,
The robot hand 29 is inserted into the gap between the compressed air means 1 and the frame-shaped clamp 2 by bending and extending or expanding and contracting the articulated movable arm (see FIG. 5). After the preformed film 5 placed on the frame-shaped clamp 2 is held on the suction cup 30 by the preformed film holding unit, the preformed film holding unit and the non-preformed film are held. Reverse upside down with the holding part. Release the suction of the suction cup of the non-preformed film holding unit and remove the non-preformed film from the frame clamp 3.
Place on top. At this time, the positioning holes formed in the film 5 and the film positioning pins 32 formed in the frame-shaped clamp 2 may be fitted together. Thereafter, the robot hand 29 is retracted from the gap between the compressed air means 1 and the frame-shaped clamp 2 (see FIG. 1). The robot hand 29 can transport the preformed film 5 to a punching die and set it, or transport the preformed film 5 to an injection molding die and directly fit or cover the cavity forming surface of the injection molding die. Things. The robot hand 29 is attached to one end of the articulated movable arm 28. The other end of the articulated movable arm 28 is attached to a support 27 (see FIG. 14). The support 27 is installed at a place fixed to a film preform apparatus or an injection mold. The multi-joint movable arm 28 is rotatable around the support table 27,
, And can move up, down, left, and right with respect to the support 27. The robot hand 29 is provided movably so as to be able to move away from or approach the articulated movable arm 28.
The robot hand 29 may be provided with a vacuum suction unit, a suction release unit, a suction cup 30, and the like so that the film 5 can be held and released arbitrarily.

As the film 5 used in the embodiment of the present invention, there is a film in which a picture layer on which a picture is formed, an adhesive layer, and the like are sequentially formed on a substrate (not shown). The base material is used as a base film or a base sheet of an ordinary film, and includes polyethylene terephthalate, acrylic, polycarbonate, triacetate, A
There are a simple substance of BS, a laminated film obtained by laminating two or more of these films, a polymer alloy of polycarbonate and polybutylene terephthalate, and a polymer alloy of polycarbonate and ABS. The picture layer consists of patterns, paintings, logos, letters,
In order to form a blank character, a symbol, or the like, it is formed by a normal forming method such as printing using a translucent ink or a light-shielding ink. The picture layer may have a metal layer formed by vacuum evaporation. The adhesive layer is used to bond the film 5 to the surface of the three-dimensional molded product at the same time as the three-dimensional molded product is formed. It is formed.

[0022]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the film preform apparatus of the present invention will be described. First, the film 5 was placed on the frame-shaped clamp 2 in the gap between the compressed air means 1 as the film adhesion means and the exhaust means 4 (see FIG. 1). To place the film 5, the robot hand 29 described above was used. The four sides of the film 5 were fixed and moved by the suction cup 30 of the robot hand 29. At the time of mounting, the positioning pins 32 formed on the frame-shaped clamp 2 were inserted into positioning holes formed at two places of the film 5 (FIGS. 1 and 9). Film 5
A substrate in which a pattern layer, an adhesive layer, and the like were sequentially formed on a substrate was used. The picture layer was formed such that the pictures for the four top covers of the mobile phone were arranged in two rows and two columns. As the substrate, a plastic film made of an acrylic resin was used. The pattern layer consists of patterns, paintings, logos,
Letters, symbols, etc. Further, in order to form a transparent window in the liquid crystal display unit, a punched window portion was formed by printing using a light-transmitting ink and a light-shielding ink. A metal layer was formed by vacuum evaporation to form glossy characters. The adhesive layer is used for integrally bonding the film 5 to the three-dimensional molded article at the same time as the three-dimensional molded article is formed. Formed.

Next, the heating device 10 is inserted into the gap between the compressed air means 1 and the frame-shaped clamp 2 and the gap between the frame-shaped clamp 2 and the convex mold 3, and the film 5 placed on the frame-shaped clamp 2 (See FIG. 2). This is because the film 5 is softened by heating to form a three-dimensional shape. The film 5 is not moved while being placed on the frame-shaped clamp 2.
0 was moved. The upper heating part 18 of the heating device 10 was inserted into the gap between the compressed air means 1 and the frame clamp 2, and the lower heating part 17 was inserted into the gap between the frame clamp 2 and the exhaust means 4. The gap between the compressed air means 1, the frame-shaped clamp 2, and the convex mold 3 was about 2 to 7 cm. The gap between the frame-shaped clamp 2 and the exhaust means 4 was about 1 to 5 cm. The reason is,
For example, when a heater panel divided into four parts is used as a heating device (see FIG. 6), the heating device 10
When the gap between the film and the film 5 is reduced, heat is easily transmitted to the film 5, but the portion corresponding to a certain portion of the heater panel is heated particularly well, and the portion corresponding to the gap between the heater panels on both sides is heated. Is insufficient, and the heating of the film 5 may not be performed uniformly over the entire surface. On the other hand, if the gap between the heating device 10 and the film 5 is increased, heat is less likely to be transmitted to the film 5, but the heating of the film 5 is performed uniformly over the entire surface.
With the above values, heat is easily transmitted to the film 5 and the entire surface of the film 5 is uniformly heated.
In this embodiment, the film 5 having a thickness of about 200 μm and an area of about 900 square centimeters is heated to form four three-dimensional portions having a rise of about 2 cm. 250 ° C
Set to. Since the temperature did not decrease due to the movement of the film 5, the heating temperature could be set at 50 to 100 ° C., which was lower than when the film 5 was moved. Heating time is 3-5
Seconds.

Next, the heating device 10 was retracted from the gap until the compressed air means 1, the frame-shaped clamp 2, the convex mold 3, and the exhaust means 4 were united (see FIG. 3). This is to prevent an obstacle when the compressed air means 1, the frame-shaped clamp 2, the convex mold 3, and the exhaust means 4 are combined. The heated film 5 is placed on the frame-shaped clamp 2 and does not move while remaining stationary. The heating device 10 moves from the gap between the compressed air means 1, the frame-shaped clamp 2 and the convex mold 3. In order to prevent convection due to the movement of the heating device 10 and the wind from hitting the heated film 5 to cause a decrease in the temperature of the film 5,
The moving speed when the heating device 10 retreats is about 30 cm /
Seconds or more are preferred.

Next, after the heating device 10 was retracted, the film 5 was fixed by the compressed air means 1 and the frame-shaped clamp 2 (see FIG. 3). By this fixing, the film 5 is sandwiched between the opening edge 31 of the compressed air means 1 and the frame-shaped clamp 2 in a predetermined annular shape (see FIG. 10). Convex 3 of film 5
Is not bridged and is bridge-shaped.
The frame-shaped clamp 2 used had a size in which a picture for four mobile phones arranged in two rows and two columns formed on the film 5 was surrounded.

Next, the compressed air means 1, the frame-shaped clamp 2, the convex mold 3, and the exhaust means 4 were combined (see FIG. 4). This is because the film 5 is put on the convex portion 7 of the convex 3 and pressurized air is injected from the compressed air hole 6 of the compressed air means 1 so that the film 5 adheres tightly to the convex 7 of the convex 3. The protrusions 7 of the protrusion 3 have a three-dimensional shape of the upper lid of the mobile phone, and are formed in two rows and two columns (see FIG. 8). After heating the upper and lower surfaces of the film 5, as soon as the heating device 10 is retracted, the convex 3
Since the film 5 can be brought into close contact with the convex portion 7 of the film 5 without any gap, it was possible to mold the film 5 into a three-dimensional shape while maintaining a sufficiently soft state. The temperature of the film 5 immediately before the compressed air was injected from the compressed air holes 6 of the compressed air means 1 was 130 ° C. and was sufficiently soft. Therefore, the pressure of the compressed air from the compressed air means 1 was 25 atm, and the compressed air time was about 4 seconds. Wait about 6 seconds after the compressed air is injected, and then
(See FIG. 5). The robot hand 29 described above was used to remove the preformed film 5 from between the compressed air means 1 and the frame-shaped clamp 2 (FIG. 5).
reference). The film 5 was fixed and moved by the suction cup 30 of the robot hand 29. When the robot hand 29 is inserted into the gap between the compressed air means 1 and the frame-shaped clamp 2 to remove the preformed film 5, the film 5 not preformed by the same robot hand 29 is used.
Was placed on the frame-shaped clamp 2.

[0027]

According to the present invention, since the above configuration is adopted, the following effects are obtained. (1) Since there is no need to move the heated film from the heating device to the film preform device, the film does not hit the wind. Therefore, (a) since the temperature of the heated film does not easily decrease, the film can be perfectly adhered to the convex shape even if the pressure at the time of pressurizing compressed air from the compressed air means is set low. (B) Since the temperature of the heated film is unlikely to decrease, sudden displacement or distortion of the picture due to shrinkage of the film is unlikely to occur. (2) Since it is not necessary to move the heated film from the heating device to the film preform device, compressed air can be injected from the compressed air means immediately after the film is heated. Therefore, the transition between the steps does not take much time, and the production efficiency is excellent. (3) Since there is no need to move the heated film from the heating device to the film preform device, a device for moving the film, such as a robot or a conveyor belt, is not required. For this reason, there is no space or expense for preparing a large-scale apparatus other than the film preform apparatus.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an example of a film preform apparatus of the present invention.

FIG. 2 is a sectional view showing an example of the film preform apparatus of the present invention.

FIG. 3 is a sectional view showing an example of the film preform apparatus of the present invention.

FIG. 4 is a sectional view showing an example of the film preform apparatus of the present invention.

FIG. 5 is a sectional view showing an example of the film preform apparatus of the present invention.

FIG. 6 is a plan view of a heating device of the film preform device of the present invention.

FIG. 7 is a plan view of a frame-shaped clamp of the film preform apparatus of the present invention.

FIG. 8 is a perspective view of a convex type of the film preform apparatus of the present invention.

FIG. 9 is a sectional view showing a part of the film preform apparatus of the present invention.

FIG. 10 is a sectional view showing a part of the film preform apparatus of the present invention.

FIG. 11 is a sectional view showing a part of the film preform apparatus of the present invention.

FIG. 12 is a sectional view showing a part of the film preform apparatus of the present invention.

FIG. 13 is a sectional view showing a part of the film preform apparatus of the present invention.

FIG. 14 is a partial sectional view showing a robot hand.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Compressed air means 2 Frame clamp 3 Convex type 4 Exhaust means 5 Film 6 Compressed air hole 7 Convex part 8 Air compression device 9 Cavity 10 Heating device 11 Heater panel 12 Taper pin 13 Bush 14 Exhaust hole 15 Frame clamp support part 16 Compressed air means Supporting part 17 Lower heating part 18 Upper heating part 19 Hydraulic cylinder 20 Post 21 Heating part 22 Drive part 23 Split heating part 24 Heating device mounting table 25 Rail 27 Supporting table 28 Articulated movable arm 29 Robot hand 30 Suction cup 31 Opening edge 32 Film positioning pin 33 Slit 34 Seed heater

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 4F208 AA21 AA24 AA28 AC03 AG01 AG03 MA03 MB01 MC03 MH06 MH10 MJ13 MJ14 MJ15 MJ22 MJ23 MJ29 MK15

Claims (6)

[Claims] 1. A film preform apparatus in which a film-adhering means, a frame-shaped clamp, a convex shape, and an exhaust means are arranged in this order, and capable of heating a film placed on the frame-shaped clamp. A film preform apparatus, comprising: a heating device. 2. A film preform apparatus in which a film-adhering means, a frame-shaped clamp, a convex mold, and an exhaust means are arranged in this order, wherein a gap between the film-adhering means and the frame-shaped clamp, and a frame-shaped clamp are provided. Heat is applied to cover the upper and lower surfaces of the film placed on the frame-shaped clamp by entering into the gap between the convex mold and the film, and the film is brought into contact with the film-clamping means, the frame-shaped clamp, the convex mold, and the exhaust means from the gap until the film is combined. A film preform apparatus comprising a heating device capable of retracting. 3. The film preform apparatus according to claim 1, wherein the heating apparatus comprises a plurality of divided heating sections capable of setting different temperatures. 4. The film preform apparatus according to claim 1, wherein the frame-shaped clamp is provided with a heater panel or a temperature control circuit. 5. An at least two taper pins are formed on an upper surface of an exhaust means, a bush corresponding to the pins is formed on a lower surface of the frame-shaped clamp, and two or more film positioning pins are formed on an upper surface of the frame-shaped clamp. 2. The method according to claim 1, wherein
A film preform apparatus according to any one of claims 1 to 4. 6. A film holding portion for removing a preformed film from a gap between a film contacting means and a frame-shaped clamp, and a film holding portion for placing an unpreformed film on the frame-shaped clamp. The film preform apparatus according to any one of claims 1 to 5, further comprising a robot hand whose parts are arranged back to back.