JP2015107638A - Vacuum molding machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vacuum molding machine that achieves excellent moldability, adhesiveness and productivity, and can prevent float-up of a decoration film.SOLUTION: A vacuum molding machine makes a decoration film stick fast to a surface of an adherend and molds it in a forming space sealed and formed by a lower box opening above and an upper box opening downwards. A housing unit for placing and housing the adherend is provided in the lower box, and a fixture suppressing float-up of the decoration film is provided to a lower end of the upper box.

Description

  The present invention relates to a vacuum forming machine.

In the conventional decoration processing of instrument panels and console boxes, a hydraulic transfer method, a film insert method, or the like using a decorative film is performed.
In addition, a vacuum pressurization method has been performed in which a molding object can be heated and molded in a closed space using a vacuum molding machine having chamber boxes on the top and bottom that are not easily affected by outside air (for example, Patent References 1-2).

Japanese Patent Application Laid-Open No. 2002-079573 JP 2012-116094 A

In the water pressure transfer method and the film insert method, there are problems in formability, adhesiveness, scratch resistance, productivity, and the like, and also in the conventional vacuum pressurization method with improved formability, as shown in FIG. There is a problem that the decorative film is lifted and product defects related to it tend to occur. Further, in the conventional vacuum pressurization method, there is a slight problem in shape followability in the case of deep drawing, and there are also problems in appearance such as a parting line visible.
An object of the present invention is to solve the above problems and to provide a vacuum forming machine that has good moldability, adhesiveness, productivity, and the like, and that does not lift a decorative film.

The present invention provides a vacuum forming machine in which a molding space is hermetically formed by a lower box opened upward and an upper box opened downward, and a decorative film is closely attached to the surface of an adherend in the molding space. The lower box is provided with an accommodating portion for placing and accommodating the adherend, and the lower end portion of the upper box is provided with a jig for suppressing the floating of the decorative film, It relates to a molding machine.
Further, in the present invention, at the lower end portion of the upper box, the jig for suppressing the floating of the decorative film is installed so as to be positioned outside the periphery of the adherend so as to partition the individual adherends. It relates to the above vacuum forming machine.
Moreover, this invention relates to said vacuum forming machine whose jig which suppresses the float of a decoration film is wire shape or a thin plate shape.
The present invention also relates to the above vacuum forming machine, wherein the wire-shaped jig has a diameter of 3 to 5 mm and a wire tension of 50 to 200 N.

  According to the present invention, it is possible to provide a vacuum forming machine that has good moldability, adhesiveness, productivity, and the like and that does not lift the decorative film.

It is state explanatory drawing of the mounting process of the vacuum forming method using the vacuum forming machine of this embodiment. It is state explanatory drawing of the decoration film mounting process of the vacuum forming method using the vacuum forming machine of this embodiment. It is state explanatory drawing of the heating process and sealing process of a vacuum forming method using the vacuum forming machine of this embodiment. It is a state explanatory view of the forming process of the vacuum forming method using the vacuum forming machine of this embodiment. It is a state explanatory view of the pressure adjustment process of the vacuum forming method using the vacuum forming machine of this embodiment. It is state explanatory drawing of the taking-out process of the vacuum forming method using the vacuum forming machine of this embodiment. It is the state figure which showed the lower end part of the upper box of the vacuum forming machine of this embodiment. It is the state figure which showed the lower end part of the upper box of the vacuum forming machine of this embodiment. It is a state explanatory view of a forming process (a) and a pressure adjustment process (b) of a vacuum forming method using the vacuum forming machine of this embodiment. It is state explanatory drawing of the formation process (a) and pressure adjustment process (b) of the vacuum forming method using the conventional vacuum forming machine.

In the vacuum forming machine of the present invention, a molding space is hermetically formed by a lower box that opens upward and an upper box that opens downward, and in the molding space, a decorative film is closely attached to the surface of the adherend. The lower box is provided with an accommodating portion for placing and accommodating an adherend, and the lower box of the upper box is provided with a jig for suppressing the floating of the decorative film. ing.
Hereinafter, it demonstrates with each process drawing of a vacuum forming method as a form for implementing the vacuum forming machine of this invention.
The vacuum forming method basically uses a vacuum forming machine of this embodiment in which a closed forming space or an open state is formed by a lower box and an upper box that are close to or away from each other, and is applied to the surface of an adherend. The decorative film is brought into close contact and molded.
The adherend is a resin-molded molded body, and is used, for example, as an instrument panel or console box for automobiles. The decorative film is a transparent or translucent resin film decorated by printing, painting, vacuum deposition, coloring, etc., and its material is not particularly limited, but specifically, acrylic resin, polyester-based Examples thereof include resins, polyolefin resins, polycarbonate resins, and fluororesins.
The surface of the adherend is preferably subjected to adhesion promoting treatment such as primer treatment and flame treatment in order to improve adhesion to the decorative film. Further, flame treatment such as flame treatment, corona treatment, and itro treatment is preferred, and flame treatment is particularly preferred.

As shown in FIG. 1, in the vacuum forming machine of the present embodiment, the lower box is provided with an accommodating portion for placing and accommodating the adherend, and the lower end portion in the upper box 6 has A jig 8 that suppresses the floating of the decorative film 5 is installed. And in the lower end part of an upper box, as shown in FIG.7, 8, the jig which suppresses the float of a decoration film is located in the periphery outer periphery of a to-be-adhered body so that each to-be-adhered body may be divided. It is installed as follows.
In order to divide between the individual adherends, when a plurality of adherends are placed and accommodated in the accommodating portion on the movable table installed in the lower box, at least two adjacent adherends are arranged. It is that the jig which suppresses the float of a decorative film is installed between the to-be-adhered bodies.

In addition, as long as the jig which suppresses the float of a decorating film has a function which suppresses the float of a decorating film, a material, a shape, etc. will not be specifically limited, However, It is preferable that it is a wire form or a thin plate form. In the case of a wire-shaped jig, the diameter is 3 to 5 mm, and the material is made of stainless steel. In the case of a thin plate-shaped jig, the thickness is 3 to 5 mm, the width is 20 to 50 mm, and the material is made of aluminum or stainless steel. Moreover, if it is a wire-shaped jig, in order to suppress the reaction force of a decorating film, wire tension is 50-200N.
If the wire tension is less than 50N, the decorative film may be floated. If the wire tension exceeds 200N, the decorative film becomes excessively stretched more than necessary, and the decorative film may be wrinkled. There is.
Moreover, when the diameter of a wire-shaped jig exists in the range of 3-5 mm, the reaction force of a decorating film is suppressed and the float of a decorating film does not generate | occur | produce.
FIG.7 and FIG.8 is the state figure which showed the lower end part of the upper box of the vacuum forming machine of this embodiment. As shown in FIG. 7, a wire-shaped jig 8 a that suppresses the floating of the decorative film is installed at the lower end 9 a of the upper box 6. Or as shown in FIG. 8, the thin plate-shaped jig 8b which suppresses the float of a decoration film is installed in the lower end part 9b of the upper box 6. As shown in FIG.
In addition, it is preferable that the jig 8 is installed so that it may be located in the outer periphery so that it may become the vicinity of a to-be-adhered body. Further, when the adherend is a quadrilateral, at least it should be in the vicinity of the outer periphery of one side, and it is preferable that the adherend is on two or more sides.

As shown in FIG. 1, in the vacuum forming machine of the present embodiment, a heater 7 is incorporated in the upper box 6, and the decorative film 5 is heated by the heater 7 in both the joined boxes. I have to.
The upper box 6 and the lower box 1 can be joined and separated. That is, the upper box 6 is provided with a driving device 10 and can be raised and lowered. A table 2 is disposed inside the lower box 1, and the table 2 can be raised and lowered by the driving device 10. For example, an air cylinder, a hydraulic cylinder, a servo motor, or the like can be used as each driving device 10.
The lower box 1 is provided with a vacuum circuit, and the upper box 6 is provided with a vacuum circuit and a compressed air (compressed air) circuit.

Hereinafter, each process of the vacuum forming method using the vacuum forming machine of this embodiment is demonstrated.
In the vacuum forming method, as shown in FIG. 1, there is a mounting step of mounting and storing the adherend 4 in the storage portion 3 on the movable table 2 installed in the lower box 1. In addition, the accommodating part 3 which accommodated the to-be-adhered body 4 previously may be moved and mounted on the table 2, or the accommodating part 3 is mounted on the table 2, and the to-be-adhered body 4 is accommodated in it. Also good.

In the vacuum forming method using the vacuum forming machine of the present embodiment, as shown in FIGS. 2 and 3, the molding space is partitioned vertically with the decorative film as a boundary, and the table and the adherend are placed in the lower molding space. And a heating process for heating the decorative film. As shown in FIG. 2, after lowering the movable table 2 in which the adherend 4 is placed and accommodated in the accommodating portion 3, the decorative film is divided up and down with the decorative film 5 as a boundary. 5 is placed on top of the lower box 1.
Thereafter, as shown in FIG. 3, the upper box 6 is lowered, the lower box 1 and the upper box 6 are brought into close contact with each other, the table 2 and the adherend 4 are sealed in the lower molding space, and the heater 7 'is started. Then, the decorative film 5 is heated. Further, both the lower box 1 and the upper box 6 are decompressed to a vacuum state using a vacuum pump (not shown) or the like. The sealed state is a state in which the decorative film 5 is placed on the upper portion of the lower box 1 and the lower box 1 and the upper box 6 are in close contact with each other.

In the vacuum forming method using the vacuum forming machine of the present embodiment, as shown in FIG. 4, the table on which the adherend is placed by the placing step described above from below the decorative film heated by the heating step. And it has the shaping | molding process which adjoins and molds a decoration film on the surface of a to-be-adhered body by making the heated decoration film adjoin.
As shown in FIG. 4, when the temperature of the heated decorative film reaches 100 to 150 ° C., the table on which the adherend is placed rises and the decorative film comes into contact with a part of the surface of the adherend. Do (over). In that case, the jig | tool installed in the lower end part of the upper box suppresses the floating of the decorative film around the adherend.

In the vacuum forming method using the vacuum forming machine of the present embodiment, as shown in FIG. 5, the forming is partitioned by reducing the pressure in the lower forming space sealed by the sealing step with respect to the upper forming space. There is a pressure adjustment step in which a pressure difference is generated in the space so that the vicinity of the surface of the adherend set on the table is in a reduced pressure environment rather than its surroundings. As shown in FIG. 5, with the table and the decorative film as a boundary, the lower molding space is maintained in a reduced pressure state, and the upper molding space is pressurized or released to the atmosphere to release the reduced pressure state. At that time, the inside of the upper molding space may be either a pressurized state or an atmospheric pressure state, and heating of the decorative film is stopped.
When the pressure difference is generated in the molding space, the heating of the decorative film is stopped, so that the excessive stretched state of the decorative film is relaxed and appropriately follows the shape of the adherend. The sagging of the decorative film, which is a cause of the floating of the film, does not occur.
If a pressure difference can be generated in the molding space partitioned by reducing the pressure in the lower (lower box) molding space relative to the upper (upper box) molding space, the lower (lower box) The reduced pressure state (vacuum state) is maintained in the molding space of the box), and the reduced pressure state (vacuum state) is relaxed without releasing the atmosphere in the molding space of the upper portion (upper box), and the upper portion (upper box) is molded. The space may be in a state of less than atmospheric pressure.

As shown in FIGS. 5 and 9B, the decorative film is pressed against the adherend and overlaid (molded) by releasing the vacuum in the upper molding space (upper box 6). In addition, by supplying compressed air into the upper molding space (upper box 6) by a compressed air tank (not shown) (pressurized state), the decorative film can be adhered to the adherend with a larger force. .
In addition, the vicinity of the surface of the adherend set on the table is in a reduced pressure environment than its surroundings. Further, as shown in FIGS. 4 and 9A, when the table is raised, it is installed at the lower end of the upper box. Since the raised jig suppresses the floating of the decorative film around the adherend, the decorative film follows and reliably adheres to the surface of the adherend. In particular, since the float of the decorative film is suppressed, there is no problem in the shape followability even in the case of deep drawing, and the end of the decorative film is reliably caught and the parting line is not visible, so the appearance is also good It is.

In the vacuum forming method using the vacuum forming machine of the present embodiment, the pressure adjustment step may be performed after the forming step or may be performed substantially simultaneously with the forming step.
By performing the pressure adjustment step and the molding step substantially simultaneously, the decorative film sticks uniformly to the surface of the adherend at once, which is advantageous in eliminating defects in appearance (such as wrinkles).

  In the vacuum forming method using the vacuum forming machine of the present embodiment, as shown in FIG. 6, a pressure releasing step for releasing the pressure difference generated by the pressure adjusting step, and a taking out step of taking out the molded product together with the pressure releasing. Have. The lower molding space and the upper molding space are opened to the atmosphere, and the pressure difference is released. Thereafter, the upper box is raised, and the adherend (molded product) having the decorative film is taken out.

1: lower box, 2: table, 3: accommodating part, 4: adherend, 5: decorative film, 6: upper box, 7, 7 ': heater, 8: jig for suppressing floating of the decorative film, 8a : Wire-shaped jig, 8b: Thin plate-shaped jig, 9a, 9b: Lower end of upper box, 10: Drive device.

Claims (4)

  A molding space is hermetically formed by a lower box opened upward and an upper box opened downward, and in the molding space is a vacuum molding machine that molds by adhering a decorative film to the surface of an adherend, The lower box is provided with a housing for placing and housing an adherend, and a vacuum forming machine is provided with a jig for preventing the decorative film from floating at a lower end of the upper box.   2. The jig according to claim 1, wherein a jig for suppressing the floating of the decorative film is installed at the lower end portion of the upper box so as to be located on the outer periphery of the adherend so as to partition each adherend. Vacuum forming machine.   The vacuum forming machine according to claim 1 or 2, wherein the jig that suppresses the floating of the decorative film is in the form of a wire or a thin plate.   The vacuum forming machine according to claim 3, wherein the wire-shaped jig has a diameter of 3 to 5 mm and a wire tension of 50 to 200N.

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