JP3244527B2 - Vacuum press lamination molding equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transfer method in which a pattern or the like is applied to the outer surface of a three-dimensionally formed base material such as cabinets, doors and other fittings, furniture, containers and the like of various audio and visual equipment. The present invention relates to a vacuum press laminating and forming apparatus suitable for laminating and forming decorative sheets such as sheets and adhesive sheets.

[0002]

2. Description of the Related Art As an apparatus for bonding a decorative sheet to the outer surface of a forming substrate and laminating the same, for example, a vacuum press laminating apparatus as shown in FIG.
No.-9276, JP-B-60-8924, JP-B-60-
No. 58014, etc.). In brief, the apparatus 10 includes a sheet-side chamber (upper die) 11 having a rubber-like elastic film 14 disposed to face a decorative sheet S placed on a molding base 5, a molding base 5, And a substrate-side chamber (lower mold) 21 provided with a suction table 22 having a required number of ventilation holes 23 in which the mounting table 6 for supporting and fixing the sheet-side chamber 11 is provided. By lowering the mold to the substrate-side chamber 21 side and clamping them, and by vacuum-suctioning the air in the substrate-side chamber 21 and / or pressurizing the sheet-side chamber 11, the space between the two chambers is reduced. The decorative sheet S is pressed by the rubber-like elastic film 14 by the rubber-like elastic film 14 being heated by the heater 15 by causing a pressure difference between the rubber-like elastic film 14 and the decorative sheet S. On the outer surface Together with attached, it is to adhere to soften the decorative sheet S by the heat of the rubber-like elastic membrane 14.

[0003] Such an apparatus is generally assumed to be a case where the decorative sheet is a sticking sheet, but can also be applied to a case where the decorative sheet is a transfer sheet. , Leaving only the releasable substrate sheet. According to the conventional vacuum press lamination molding apparatus as described above, not only the pressure difference between the chambers but also the pressing force by the rubber-like elastic film is applied to the decorative sheet, and the decorative sheet is heated via the rubber-like elastic film. Therefore, it is possible to sufficiently and uniformly perform the pressing of the decorative sheet to the forming base material and the softening by heating, so that good formability should be obtained.

[0004]

However, it has been found by the inventors of the present application that the following problems occur when the decorative sheet is actually adhered to a forming substrate and laminated and formed by such an apparatus. . That is, in the above device,
Since the decorative sheet is placed on the molding substrate in a free state, if the rubber-like elastic film comes into contact with the decorative sheet during mold clamping between the sheet-side chamber and the substrate-side chamber, the decorative sheet may move and shift. If the decorative sheet is liable to cause molding failure (positional deviation, etc.) and the decorative sheet has a curl or the like and cannot be flattened as shown in FIG. In a decorative sheet made of a relatively thin PVC sheet or the like, which is likely to cause cracking, even if it is laid flat on a molding substrate, it is affected by the heat when the rubber-like elastic film is heated. As a result, softening occurs before the mold is clamped, and a corrugated state is formed.

In view of the foregoing, the present invention is to provide a decorative sheet with a pressing force by a rubber-like elastic film in addition to a pressure difference between chambers, in order to solve the above-mentioned problems of the conventional vacuum press laminating apparatus. Provided is a novel vacuum press laminating apparatus capable of reducing molding defects, wrinkles, blisters, transfer defects, etc. as much as possible while heating a decorative sheet via a rubber-like elastic film. The purpose is to:

[0006]

In order to achieve the above-mentioned object, a vacuum press laminating and forming apparatus according to the present invention basically has a structure in which a forming substrate is placed on a suction table provided in a substrate-side chamber. The decorative sheet is set in a predetermined manner with respect to the molding base material, and the rubber-like elastic film provided in the sheet-side chamber is arranged to face the decorative sheet,
A pressure difference is generated between the sheet-side chamber and the substrate-side chamber, and by heating the rubber-like elastic film, the decorative sheet is pressed against the outer surface of the molding substrate by the rubber-like elastic film. It is softened and adhered together.

A feature of the present invention is that a clamp means for detachably holding a peripheral portion of the decorative sheet is provided between the substrate-side chamber and the sheet-side chamber. In the vacuum press laminating and forming apparatus of the present invention, a conventionally known vacuum press apparatus can be used as a basic component as it is, and a clamp means may be added thereto.

[0008] As a preferred embodiment of the clamping means, a cylindrical fixed clamp table disposed on the suction table so as to surround the molding base, a ring-shaped movable clamper disposed on the fixed clamp table, Which is configured to be pressed and held between the fixed clamp table and the movable clamper with the peripheral edge of the decorative sheet interposed therebetween. The structure of the clamping means is not particularly limited as long as it can hold the peripheral edge of the decorative sheet at the time of molding. It may be obtained by utilizing, or a separate pressing means or the like may be provided.

The decorative sheet to be bonded and laminated in the apparatus of the present invention includes both a synthetic resin transfer sheet and an adhesive sheet (laminated laminated sheet), and may be a sheet-like material other than resin. The adhesive layer formed or coated on the back surface side or the adhesive layer formed or coated on the molding substrate side, and the adhesiveness of itself is activated or developed by heat or the like. Adhered to the molding substrate.

The decorative sheet may be a commonly used decorative sheet, but the effect of the provision of the clamping means, which is a feature of the present invention, is that wrinkles and the like are easily generated in the conventional apparatus.
Relatively thin P with some elasticity or stretchability
It is better exhibited by a VC sheet or the like.

[0011]

In the vacuum press laminating and forming apparatus according to the present invention having the above-described structure, the decorative sheet is separated from the forming base material in a state where the peripheral edge portion thereof is fixed by the clamp means and is substantially slack. Under such circumstances, pressurization of the sheet-side chamber and / or vacuum suction of the substrate-side chamber are performed, and the pressing force of the rubber-like elastic film is applied to the decorative sheet, and the decorative sheet is also passed through the rubber-like elastic film. The decorative sheet is heated.

As a result, the decorative sheet is softened and stretched together with the rubber-like elastic film, is brought into close contact with the molding base, and is adhered to the outer surface of the molding base in that state. Then, after the decorative sheet is adhered to the molding base, the pressing and heating of the rubber-like elastic film on the decorative sheet are released, the holding state by the clamp means is released, and the decorative sheet is adhered to the molding base as necessary. Finishing is performed to cut off the peripheral portion of the decorative sheet.

By fixing the peripheral edge of the decorative sheet at the time of molding as described above, the position of the decorative sheet is prevented from being displaced. This is corrected, and even a relatively thin decorative sheet does not become wavy, and molding defects, wrinkles, blisters, transfer defects, and the like are reduced as much as possible, and an extremely high-quality product can be obtained.

[0014]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. FIG. 1 shows a main part of an example of a vacuum press lamination molding apparatus of the present invention. The vacuum press laminating and forming apparatus 10 includes a seat-side chamber 11 connected to the tip of a piston rod 13 of a fluid pressure cylinder device 12 having an automatic locking function supported on a support frame (not shown) and vertically moved up and down. And a base-side chamber 21 mounted on a fixed machine base not facing the sheet-side chamber 11.

The seat-side chamber 11 has a box shape with a lower opening, and a rubber-like elastic film 14 such as silicon rubber having heat resistance and elasticity is stretched over the lower opening so as to close the lower surface opening. A plurality of heaters 15 of infrared or far-infrared type are attached to the ceiling surface in a predetermined manner, and a supply / discharge port for supplying / discharging air to / from the chamber 11 is provided on one side surface. 16 are formed.

On the other hand, the substrate-side chamber 21 has a box shape with an upper opening, and a plate-shaped suction table 22 having a large number of through holes 23 formed in a predetermined arrangement is attached to the upper opening. On one side, this chamber 2
Supply / exhaust port 2 for supplying / exhausting air to / from 1
6 are formed. A base mounting table 6 for supporting and fixing the forming base 5 at the time of lamination molding is attached to a central portion on the upper surface side of the suction mounting base 22. Although the mounting table 6 can be omitted, it is preferable to use the mounting table 6 in order to make the decorative sheet follow the side surface of the molding base 5 or even a part of the back surface. As shown in FIG. 1, it is preferable to use a mounting table 6 that is narrower than the molding base 5.

Although not shown, the supply / discharge ports 16 and 26 are selectively connected to a compressor and a vacuum pump through three-way switching valves, respectively. Substrate side chamber 2
1 can be depressurized or pressurized or kept at a constant pressure from an open-to-air state. Also, the amount of heat generated by the heater 15 can be controlled by controlling the amount of power supplied thereto, the duration of power supply, the phase flow angle, and the like.

On the suction table 22 of the substrate-side chamber 21, there is provided a clamp means for detachably holding the peripheral edge of the decorative sheet S. The clamp means includes a rectangular cylindrical fixed clamp table 31 provided on the suction table 22 so as to surround the molding base 5 placed on the mounting table 6, and is disposed on the fixed clamp table 31. And a ring-shaped movable clamper 30 having a rectangular cross section corresponding to the fixed clamp table 31. The fixed clamp table 31 has an upper end surface that is a flat surface parallel to a horizontal plane, which is positioned slightly higher than the uppermost surface of the forming base material 5, and the movable clamper 30 has a triangular cross section on its lower surface. A locking concavo-convex portion 30a composed of a plurality of valleys and peaks having a shape is provided. Therefore, in this clamping means, the decorative sheet S is pressed and held between the fixed clamp table 31 and the movable clamper 30 with the peripheral portion of the decorative sheet S interposed therebetween.

In this apparatus, as for the basic components other than the clamping means, a conventionally known vacuum press laminating apparatus can be used as it is. Next, a procedure for bonding a decorative sheet to a forming base material using the vacuum press laminating and forming apparatus of the present embodiment having the above-described configuration will be described. In this example, first, a wooden (MDF molded) molding base material 5 having a three-dimensional shape, for example, used for a furniture door or the like, is positioned and installed on a base material mounting table 6. An adhesive P is provided on the upper, side, and lower peripheral portions of the molding base 5.
Urethane-based aqueous emulsion (for example, CVC550 manufactured by Konishi Bond Co., Ltd.) is applied (5-6 g /
m ² ).

Then, the peripheral portion of the decorative sheet S cut in advance to a predetermined size is placed on the fixed clamp table 31,
The movable clamper 30 is placed thereon. Decorative sheet S
Is a colored PVC layer Sa, as shown in FIG.
(For example, R type manufactured by Riken Vinyl Co., Ltd.) and a pattern layer Sb printed thereon (with a binder of vinyl chloride or vinyl acetate copolymer) and having a thickness of about 0.08 mm.
A C single layer sheet is used.

In this case, the peripheral edge of the decorative sheet S is sandwiched between the movable clamper 30 and the fixed clamp table 31, and is locked and held by the locking uneven portion 30a by the weight of the movable clamper 30, and is substantially held. It is set away from the molding substrate without slack. The above decorative sheet S
After or before the heater is set, the heater 15
Is heated to heat the rubber-like elastic film 14 to about 60 ° C., and pressurized air is supplied to the seat-side chamber 11 to increase its internal pressure. Thereafter, the suction of the air in the substrate-side chamber 21 is started, and the sheet-side chamber 11 is lowered as shown in FIG. 3 to perform the mold clamping. The outer peripheral end presses against the movable clamper 30 and presses it downward, so that the rubber-like elastic film 14 comes into close contact with a portion of the decorative sheet 1 inside the fixed clamp table 31. At this time, the engaging concave and convex portions 30a of the movable clamper 30 slightly bite into the decorative sheet S, and the decorative sheet S is securely held.

When this state is continued for about 20 seconds, the heat of the rubber-like elastic film 14 is gradually transferred to the decorative sheet 1, and the decorative sheet 1 is heated and softened. Subsequently, in this state, air existing in the suction table 22, the movable clamper 30, and the decorative sheet S (hereinafter, referred to as a sub-membrane molding space) is completely sucked and deaerated, and the sheet is deaerated. The inside of the side chamber 11 is further pressurized. Thereby, as shown in FIG. 4, the pressing force of the rubber-like elastic film 14 is applied to the decorative sheet S, and the decorative sheet S is softened and stretched together with the rubber-like elastic film 14 and adheres to the molding base 5. I'm sullen. When this state is maintained for about 120 seconds, the decorative sheet S
Is securely adhered to the outer surface of the molding substrate 5.

After the decorative sheet S is adhered to the molding substrate 5, the sheet-side chamber 11, the substrate-side chamber 21
The interior is returned to the atmosphere open state, and the seat-side chamber 11 is raised, so that the rubber-like elastic film 1 for the decorative sheet S
4 is released and the movable clamper 3 is released.
0 and the fixed state of the decorative sheet S by the fixed clamp table 31 is also released, and the molding base 5 to which the decorative sheet S is adhered is taken out, and if necessary, the periphery of the decorative sheet not adhered to the molding base 5 Finishing processing for cutting off parts and the like is performed.

As described above, in the vacuum press laminating and forming apparatus of this embodiment, since the peripheral edge of the decorative sheet S is fixed at the time of molding, the position of the decorative sheet S is prevented from being shifted. Even if there is a curl or the like remaining on the decorative sheet S, it is corrected at the time of molding, and even if the decorative sheet is relatively thin, it does not become wavy, and poor molding, wrinkles, swelling or poor transfer is possible. And a very high quality product can be obtained.

In the above-described example, the clamping means includes a fixed clamp base 31 and a locking concave / convex portion 30a on the lower surface.
Although the movable clamper 30 provided with is used,
As the clamping means, for example, various means can be used as shown in FIGS. 5, 6, 7, and 8. The clamping means shown in FIG. 5 fixes the screw 35 with the decorative sheet S sandwiched from the movable clamper 32 side.
It is screwed into 1 and fixed.

The clamping means shown in FIG. 6 is provided with a pressing spring 42, a handle 43, a fixed link 44, and the like.
A plurality of L-shaped clamp members 40 hinged to the fixed clamp table 31 with pins 41 are provided, and the movable clamper 32 is pressed toward the fixed clamp table 31 to clamp the decorative sheet S. is there. The clamp means shown in FIG. 7 is provided with a convex part 32 b having a semicircular cross section on the lower surface of the movable clamper 32, and a semicircular cross section in which the convex part 32 b is fitted to the fixed clamp table 31 with the decorative sheet S interposed therebetween. A recess 31 is provided.

The clamping means shown in FIG. 8 has a locking member 46 attached to the outer peripheral edge of the decorative sheet S to press the decorative sheet S and prevent the decorative sheet S from being drawn inward.

[0028]

As can be understood from the above description, according to the vacuum press laminating and forming apparatus according to the present invention, since the peripheral portion of the decorative sheet is fixed at the time of forming by the clamping means, the position of the decorative sheet is shifted. In addition, even if the decorative sheet has a curl or the like remaining on the decorative sheet, it is corrected at the time of molding, and furthermore, even a relatively thin decorative sheet does not become wavy, resulting in defective molding, wrinkles, and swelling. Alternatively, transfer defects and the like can be reduced as much as possible, and an extremely high-quality product can be obtained.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram for explaining a main part of an example of a vacuum press lamination molding apparatus according to the present invention.

FIG. 2 is a detailed view of a decorative sheet used in Examples.

FIG. 3 is a diagram for explaining a procedure of a lamination molding method in an example of the present invention.

FIG. 4 is a diagram for explaining a procedure of a lamination molding method in an example of the present invention.

FIG. 5 is a diagram which is used for describing a first modification of the clamping means.

FIG. 6 is a diagram which is used for describing a second modification of the clamping means.

FIG. 7 is a diagram which is used for describing a third modification of the clamping means.

FIG. 8 is a diagram which is used for describing a fourth modification of the clamping means.

FIG. 9 is a diagram provided for explanation of a conventional vacuum press lamination molding apparatus.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Vacuum press lamination | molding apparatus 5 Forming base material 6 Substrate mounting stand 11 Sheet side chamber 12 Cylinder device 14 Rubber-like elastic film 15 Heater 16, 26 Supply / discharge port 21 Substrate side chamber 22 Suction mounting stand 23 Through-hole 30, 32 Movable Clamp 31 Fixed clamp base S Decorative sheet P Adhesive

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ identification symbol FI // B29K 21:00 B29K 21:00 B29L 9:00 B29L 9:00 (58) Fields surveyed (Int.Cl. ⁷ , DB Name) B29C 63/00-65/82 B29C 43/00-43/58 B29C 51/00-51/46 B32B 31/20

Claims (3)

(57) [Claims] 1. A molding base is arranged on a suction table provided in a substrate-side chamber, a decorative sheet is set on the molding base in a predetermined mode, and the base material side of the sheet-side chamber is set. The rubber-like elastic film provided on the decorative sheet is disposed to face the decorative sheet, and the vacuum suction and / or
Alternatively, a pressure difference is generated from the sheet-side chamber side to the substrate-side chamber side by pressurization of air in the sheet-side chamber, and the rubber-like elastic film is heated so that the decorative sheet is made of the rubber-like material. In a vacuum press lamination molding apparatus which is pressed against the outer surface of the molding base material by means of an elastic film and is softened and adhered, the above-mentioned structure is formed between the substrate side chamber and the sheet side chamber.
Clamping hand for detachably holding the periphery of the cosmetic sheet
A step is provided, and the clamping means wraps the forming substrate.
A cylindrical fixed clamp placed on the suction table to surround it
Ring and a ring-shaped support placed on this fixed clamp
A fixed clamp table and a movable clamp.
Pressing and holding the periphery of the decorative sheet with the ramper
And a press for holding by pressing.
Pressure is obtained by using the lowering motion of the seat side chamber.
Vacuum press lamination molding apparatus characterized by comprising in the. 2. The movable clamper has a fixed clamp table.
On the facing lower surface, there are locking irregularities consisting of multiple valleys and peaks
The vacuum pump according to claim 1, wherein the vacuum pump is provided.
Less laminate molding equipment . 3. The fixed clamp table of the movable clamper is
A convex portion having a semicircular cross section is provided on the facing lower surface, and the fixed
The protrusion fits on the upper surface of the pump table facing the movable clamper.
It is characterized by having a recess with a semicircular cross section
The vacuum press lamination molding apparatus according to claim 1 .