JP3394058B2 - Decorative sheet laminating equipment - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention has a three-dimensional molded base material for forming cabinets of various audio / visual equipment, doors and other fittings, furniture, containers, etc. The present invention relates to a decorative sheet laminating apparatus suitable for laminating and laminating decorative sheets such as transfer sheets and adhesive sheets.

[0002]

2. Description of the Related Art As one of decorative sheet laminating apparatus for laminating a decorative sheet on an outer surface of a molding substrate, for example, Japanese Patent Publication No. 9785/1989, 45-56868.
The OVL molding apparatus described in Japanese Patent Publication No. 1994-242242 is known. This apparatus has a sheet-side chamber (upper chamber) and a substrate-side chamber (lower chamber) that are partitioned by a decorative sheet, and a suction table in which a ventilation hole is formed in the substrate-side chamber. It is installed and formed between the decorative sheet and the suction table while heating the decorative sheet with the heater provided in the sheet side chamber under the condition that the molding substrate is arranged on the suction table. The air in the closed space is vacuum-sucked through the ventilation hole formed in the suction table and the interior of the chamber on the seat side is pressurized as necessary, so that the decorative sheet causes the pressure difference between the seat-side chamber and the upper chamber. Is to be pressed and adhered to the outer surface of the molding substrate.

In such an apparatus, since the decorative sheet is generally pressed against the molding base material only by the pressure difference,
There is a case where the pressing force of the decorative sheet on the side of the molding substrate is insufficient or there is a partial unevenness, and there are uneven steps provided on the outer surface or the curvature of the end or local portion of the outer surface is large. In that case, the decorative sheet cannot be completely adhered to the uneven portion and the curved portion, and thus adhesion failure is likely to occur.

Therefore, in order to solve the above problems,
As another example of the decorative sheet laminating apparatus, as described in, for example, Japanese Utility Model Publication No. 46-9276 and Japanese Patent Publication No. 60-58014, a decorative sheet is added to the rubber-like elasticity in addition to the above pressure difference. A vacuum press lamination molding apparatus has been proposed which is pressed by a film to adhere to a molding substrate.

This apparatus 50 is schematically shown in FIG. 4 in which the molded state is illustrated. The box-shaped seat side chamber 1 in which the downward opening is closed by the rubber elastic film 14 is illustrated.
1 and a box-shaped substrate-side chamber 21 in which a suction table 22 having a vent hole 23 is installed in an upward opening, and the molding substrate 1 is arranged on the suction table 22. At the same time, after the decorative sheet S is set on the molding substrate 1 via an adhesive, the sheet-side chamber 11 and the substrate-side chamber 21 are clamped to form the rubber-like elastic film 14 and the suction table 22. A closed space is formed between the seat side chamber 1
While heating the rubber-like elastic film 14 by the heater 15 provided inside 1, the air in the closed space is vacuum-sucked through the ventilation holes formed in the suction table, and the inside of the seat-side chamber is moved as necessary. By pressing, the decorative sheet is heated and softened by the rubber-like elastic film while being pressed and adhered to the outer surface of the molding substrate.

In the above two decorative sheet laminating / molding apparatuses, the base material mounting jig is placed on the suction mounting table 22 so that the cosmetic sheet S is attached to the side surface of the molding base material 1 and partly on the back surface thereof to be bonded. It is usual that 18 is arranged and the decorative sheet 1 is set on the base material mounting jig 18. The base material mounting jig 18 has a shape corresponding to a product shape to be obtained, but is usually manufactured in a pedestal shape having a width narrower than that of the molding base material 1, and the material thereof is generally used in an OVL molding apparatus. Metal, bakelite, silicon rubber, etc. are used. In the vacuum press laminating machine, plywood, particle board, M
A wood molded product having air permeability such as DF is often used.

[0007]

However, in both the conventional OVL molding apparatus and the vacuum press lamination molding apparatus described above, the base material placing jig 18 used for the decorative sheet lamination molding apparatus is vacuum suction. It is not used as a pedestal for supporting the molded substrate 1, but is not provided with a special function for increasing the rate.

Therefore, even if the air in the closed space formed between the decorative sheet S or the rubber-like elastic film 14 and the suction table 22 is vacuum-sucked through the vent hole 23 formed in the suction table 22, the air is closed. In some cases, the air in the space cannot be sufficiently degassed, and the decorative sheet S or the rubber-like elastic film 14 is generated.
Between the molding base 1 and the molding base 1, and particularly in the portion surrounded by the back surface of the molding base 1, the decorative sheet or the rubber-like elastic film 14 and the base mounting jig 18, as indicated by reference numeral Q in FIG. Accumulation of the decorative sheet S causes insufficient adhesion of the decorative sheet S to the molding substrate 1 and wrapping property of the molding substrate 1 to the lower rear surface side, and molding of blisters, transfer defects, wrinkles, etc. on the outer surface of the product. There is a problem in that the decorative sheet cannot be properly adhered to a product having a complicated appearance, especially when the product has a complicated external shape.

In view of such a point, the present invention is formed between the decorative sheet or the rubber-like elastic film and the suction table by providing the substrate mounting jig with a special means for increasing the vacuum suction rate. The air inside the closed space can be sufficiently degassed through the ventilation port formed in the suction table, so that the adhesion of the decorative sheet to the molding substrate and the wraparound of the lower back surface of the molding substrate. It is possible to improve the property of the product, and it is possible to prevent molding defects such as swelling, transfer defects, and wrinkles on the outer surface of the product, and it is possible to properly adhere the decorative sheet even to products with a complicated external shape. An object is to provide a decorative sheet laminating apparatus.

[0010]

In order to achieve the above-mentioned object, one of the decorative sheet laminating apparatus according to the present invention is one in which a decorative sheet is adhered to a molding substrate by a vacuum press laminating method to laminate-form. The configuration is basically a box-shaped seat side chamber in which the downward opening is closed by a rubber-like elastic film, and the suction table with a vent is formed in the upward opening. And a base material mounting jig arranged on the suction table, and a molding base material is arranged on the base material mounting jig. , With the decorative sheet set on the molding substrate,
The sheet-side chamber and the substrate-side chamber are clamped to form a closed space between the rubber-like elastic film and the suction table, and the rubber-like elasticity is provided by a heater provided in the seat-side chamber. While the film is being heated, the air in the closed space is vacuum-sucked through the ventilation holes formed in the suction table, and the interior of the seat-side chamber is pressurized if necessary, so that the decorative sheet is made to have the rubber-like elasticity. The film is pressed and adhered to the outer surface of the molding substrate while being softened by heating.

Further, the base material mounting jig has such a size that the mounting surface thereof can enter the bottom surface of the molding base material when the molding base material is arranged, and A plurality of vertical groove-shaped ventilation passages that are opened laterally and that are continuous from the mounting surface side to the ventilation holes formed in the suction mounting table are provided in the side peripheral portion of the mounting jig. And In addition, another one of the decorative sheet laminating apparatus according to the present invention is OVL.
This is for laminating and forming a decorative sheet by adhering a decorative sheet to a molding substrate by a molding method, and its configuration basically has a sheet-side chamber and a substrate-side chamber that are partitioned by the decorative sheet. Then, a suction table having a ventilation hole is installed in the base material side chamber , a base material mounting jig is arranged on the suction base, and a molding base material is placed on the base material mounting jig. Under the arrangement, while heating the decorative sheet by the heater provided in the seat side chamber, the air in the closed space formed between the decorative sheet and the suction table is formed on the suction table. By vacuum suction through the ventilation holes and pressurizing the inside of the upper chamber as needed, the outer surface of the molding substrate is heated by the pressure difference between the upper chamber and the lower chamber while heating and softening the decorative sheet. Push It is to adhere put.

The base mounting jig has such a size that the mounting surface can enter the bottom surface of the molding base when the molding base is placed, and A plurality of vertical groove-shaped ventilation passages that are opened laterally and that are continuous from the mounting surface side to the ventilation holes formed in the suction mounting table are provided in the side peripheral portion of the mounting jig. And The base material placing jig used in the decorative sheet laminating and molding apparatus according to the present invention has a pedestal shape which is narrower as a whole than the bottom surface shape of the molding base material according to the product shape to be obtained. In the OVL molding apparatus, metal, bakelite, silicone rubber, etc. are generally used as the material.
Further, in the vacuum press lamination molding apparatus, a wood-molded product having air permeability such as plywood, particle board, and MDF can be used, and a ventilation passage is provided so as to vertically penetrate the side peripheral portion from the mounting surface to the bottom surface. Is desirable.

The decorative sheet adhered to the molding substrate by the decorative sheet laminating apparatus of the present invention includes both a synthetic resin transfer sheet and an adhesive sheet (laminating laminated sheet), and further has a veneer plate and the like. Sheet-like materials other than the above resin may be used, and the adhesive layer formed or coated on the back surface side of them or the adhesive layer formed or coated on the molding base material side, or the adhesive property of itself is It is adhered to the molding substrate by being activated or expressed by the above.

The transfer sheet is composed of a releasable base sheet and a transfer layer, and the base sheet is made of a material to be transferred (molding base material) such as a resin molded product produced by injection molding. When the surface is generally curved, polyvinyl chloride, polyamide such as nylon 6, nylon 66, polyethylene,
Polyolefin such as polypropylene, polyethylene terephthalate, low crystallinity polyester such as polyethylene terephthalate-isophthalate copolymer, polyvinyl chloride, vinylon and the like, a flexible thermoplastic resin film, or a laminate thereof is appropriately used, Further, the release layer provided as required is a thermosetting acrylic, melamine, urethane, polyester, aminoalkyd for the purpose of flexibility, heat resistance during molding, and prevention of seizure between the release layer and the transfer layer. It is preferable to use one kind or a mixture of two or more kinds of resins such as epoxy resin. On the other hand, the decorative transfer layer usually consists of only a picture layer (however, a thermoplastic resin is used as a binder and also serves as a heat-sensitive adhesive layer, and dyes, pigments, etc. are added), a pattern layer and a heat-sensitive adhesive layer. , A release layer, a pattern layer, and a heat-sensitive adhesive layer, and a release layer and a pattern layer. These are cellulose resin, styrene resin, acrylic resin, vinyl resin, rosin ester. A natural or synthetic resin such as a base resin or a polyamide resin is appropriately used, and the pattern layer is provided with a printing ink pattern, partial metal vapor deposition of aluminum or the like.

As the above-mentioned laminated laminated sheet, one comprising a base sheet and a heat-sensitive adhesive layer is used. In order to give the base sheet a design property and an industrial function, various pattern printing, metal deposition, etc. Decorative treatment, chemical or physical treatment, etc. are appropriately applied. In addition, the heat-sensitive adhesive layer can be omitted when the laminating laminated sheet itself has adhesiveness and when the adhesive layer is formed or coated on the molding substrate side, and in that case, it is necessary. Corona discharge treatment, various primer coatings, and the like may be performed according to the above in order to improve the adhesiveness to the molding substrate. The material of the base material sheet is a film having thermoplasticity, and in addition to the material of the releasable base material sheet, acrylic resin, ABS (acrylonitrile-butadiene-styrene copolymer), or polystyrene can also be used. In this case, releasability is unnecessary.

For the heat-sensitive adhesive layer used for adhering the above-mentioned transfer sheet and laminating laminated sheet, a thermoplastic resin, an ionomer or the like can be appropriately used. As the resin, for example, ethyl cellulose, cellulose nitrate, cellulose acetate, ethyl hydroxyethyl cellulose, a cellulose derivative such as cellulose acetate propionate, polystyrene, a styrene resin such as poly α-methylstyrene or a styrene copolymer, polymethyl methacrylate, Polyethyl methacrylate, polyethyl acrylate,
Acrylic resin such as polybutyl acrylate, polyvinyl chloride, polyvinyl acetate, vinyl chloride-vinyl acetate copolymer, ethylene-vinyl alcohol copolymer, vinyl polymer such as polyvinyl butyral, rosin, rosin modified maleic acid resin, Examples thereof include rosin-modified phenol resin and rosin ester resin such as polymerized rosin.

Further, the molding base material to which the decorative sheet is adhered by the decorative sheet laminating apparatus of the present invention is not limited to a plate-like body such as a flat plate or a curved plate, but may be a relatively complicated three-dimensional object having an uneven portion or the like. The material is not particularly limited, and may be wood, synthetic resin, metal, ceramics, or the like. In this case, examples of the material of the synthetic resin molded product include ABS, polystyrene, acrylic, polyvinyl chloride, phenol resin and the like.

[0018]

[Operation] In the decorative sheet laminating apparatus according to the present invention configured as described above, the air in the closed space formed between the decorative sheet or the rubber-like elastic film and the suction table is transferred to the suction table. When vacuum suction is performed through the formed ventilation hole, the air in the closed space is removed to the outside through the vertical groove-shaped ventilation passage formed in the side peripheral portion of the substrate mounting jig and the ventilation hole of the suction table. It

In this case, if the air in the closed space is not sufficiently degassed, the decorative sheet or the rubber-like elastic film is brought into close contact with the side surface of the base material mounting jig, so that the back surface of the molding base material and the decorative sheet. Alternatively, even if air remains in a portion surrounded by the rubber-like elastic film and the base material mounting jig (the portion Q in FIG. 4 described above), such residual air causes the side circumference of the base material mounting jig. It is quickly removed to the outside through the vertical groove-shaped ventilation passage formed in the portion and the ventilation hole of the suction table.

Therefore, according to the decorative sheet laminating apparatus of the present invention, the air existing between the decorative sheet or the rubber-like elastic film and the molding substrate is sufficiently deaerated, and the decorative sheet is molded on the molding substrate. Adhesion and wraparound to the lower back surface of the molding base are enhanced, and molding defects such as swelling, transfer defects, and wrinkles do not occur on the outer surface of the product. It becomes possible to bond properly.

[0021]

Embodiments of the present invention will now be described in detail with reference to the accompanying drawings. FIG. 1 shows an embodiment of a vacuum press laminating apparatus as a decorative sheet laminating apparatus according to the present invention. The vacuum press lamination molding apparatus 10 is connected to the tip of the piston rod 13 of a fluid pressure cylinder device 12 with an automatic lock function supported by a support frame (not shown) and is vertically moved up and down, and a seat side chamber 11 is shown. It has a base material side chamber 21 mounted so as to face the seat side chamber 11 on a stationary machine table which is not provided.

The seat side chamber 11 has a box-like opening with a lower opening, and a rubber-like elastic film 14 made of silicon rubber or the like having heat resistance and stretchability is stretched over the lower opening so as to close the lower opening. , The chamber 1 on one side
Supply / exhaust port 1 for supplying / exhausting air to / from 1.
6 is formed, and a heater 15 is arranged at the bottom of the seat side chamber 11.

On the other hand, the base material side chamber 21 has a box-shaped upper opening, and a plate-shaped suction table 22 having ventilation holes 25 formed in a predetermined arrangement is attached to the upper opening. At the same time, a supply / discharge port 26 for supplying / discharging air to / from the chamber 21 is formed on one side surface. Further, as shown in detail in FIG. 2, a substrate mounting jig 18 for supporting and fixing the molding substrate 5 at the time of laminating and molding is arranged in the central portion on the upper surface side of the suction table 22. This base material mounting jig 18
Is made of, for example, a wood-molded product having air permeability such as MDF, and the size of its mounting surface is such that when the molding substrate 5 is placed, it can enter the bottom surface of the molding substrate 5. Further, a plurality of vertical ventilation passages 20 are provided in the side peripheral portion thereof so as to be open to the side and to be connected to the ventilation holes 25 formed in the suction table 22 from the mounting surface side which is the upper surface. Has been.

That is, here, the ventilation passages 20 each having a semicircular cross section are provided at predetermined intervals, six at each of the front and rear side peripheral portions of the substrate mounting jig 18, and three at each of the left and right side peripheral portions. Formed in parallel and open, and the suction table 22
The ventilation hole 25 having a circular cross-section so as to overlap the ventilation passage 20 at a position directly below each ventilation passage 20 in
Has been drilled.

Further, the substrate mounting jig 1 is placed on the suction table 22.
A rectangular frame-shaped body 24 is arranged so as to surround 8.
The frame-shaped body 24 is used to reliably seal the closed space formed between the rubber-like elastic film 14 and the suction table 22 and effectively suck the air therein. Although not shown, the supply / discharge ports 16 and 26 are configured to be selectively connected to a compressor and a vacuum pump via three-way switching valves, respectively. The inside of the substrate-side chamber 21 can be depressurized or pressurized or kept at a constant pressure from the atmosphere open state.

Next, a method for laminating the decorative sheet S on the door base material 1 using the vacuum press laminating apparatus 10 having the above-mentioned structure will be described. First, the molding substrate 1 is positioned and set on the substrate mounting jig 18. In this case, about 30 minutes before the press molding, a urethane-based aqueous emulsion (for example, C manufactured by Konishi Bond Co., Ltd.) is preliminarily used as the adhesive 19 on the peripheral portions of the upper surface, the side surface, and the lower surface of the molding substrate 1.
VC550) is spray applied.

Subsequently, the decorative sheet S, which has been cut into a predetermined size in advance, is positioned and set on the molding substrate 11.
As the decorative sheet S, a 0.25 mm doubling sheet pattern-printed on a PVC sheet which is a thermoplastic resin film is used here. Then, after the decorative sheet S is set, or before the heater 15 is heated, the rubber-like elastic film 14 is heated to, for example, about 7 mm.
While being heated to 0 ° C, pressurized air is supplied to the seat side chamber 11 to increase its internal pressure. After that,
The suction of the air in the base material side chamber 21 is started, and the seat side chamber 11 is lowered to perform mold clamping, whereby the outer peripheral end of the rubber-like elastic film 14 is pressed against the frame-shaped body 24. And stick together.

If this state is continued for about 20 seconds, for example,
The heat of the rubber-like elastic film 14 is gradually conducted to the decorative sheet 1,
The decorative sheet 1 is softened by heating. Subsequently, in this state, the air existing in the closed space surrounded by the suction table 22 and the rubber-like elastic film 14 is sucked and deaerated, and the inside of the seat side chamber 11 is further pressurized. Thereby,
As shown in FIG. 3, a pressing force by 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 brought into close contact with the door base material 1.

In this process, the air in the closed space formed between the rubber-like elastic film 14 and the suction table 22 is used for ventilation in the form of a vertical groove formed in the side peripheral portion of the substrate mounting jig 18. It is removed to the outside through the passage 20 and the ventilation hole 25 of the suction table 22. In this case, if the air in the closed space is not sufficiently degassed, the rubber-like elastic film 14 comes into close contact with the side surface of the base material mounting jig 18, and the back surface of the molding base material 1 and the rubber-like elastic film 14 are adhered.
Even if air remains in a portion surrounded by the base material mounting jig 18 and the base material mounting jig 18,
Through the vertical groove-shaped ventilation passage 20 and the ventilation hole 25 of the suction table 22 formed in the side peripheral portion of the device, the air is promptly removed to the outside.

When the above state is maintained for, for example, about 120 seconds, the decorative sheet S is surely adhered to the outer surface of the molding substrate 1, and after the decorative sheet S is adhered to the molding substrate 1,
The inside of the sheet side chamber 11 and the base material side chamber 21 is returned to the atmosphere open state, the sheet side chamber 11 is raised, and the pressing and heating of the rubber-like elastic film 14 against the decorative sheet S is released, and the decorative sheet S The laminated door base material 1 is taken out, and if necessary, finishing processing is performed to cut off the peripheral portion of the decorative sheet that is not adhered to the molding base material 1.

Therefore, by doing as described above,
Air existing between the decorative sheet S or the rubber-like elastic film 14 and the molding substrate 1 is sufficiently deaerated, and the adhesiveness of the decorative sheet S to the molding substrate 1 and the surrounding of the molding substrate to the lower back surface side. Incorporation is enhanced, swelling on the outer surface of the product, transfer failure,
Molding defects such as wrinkles are less likely to occur, and it is possible to properly bond the decorative sheet even to a product having a complicated external shape.

Although the above-mentioned embodiment is one in which the present invention is applied to a vacuum press laminating apparatus as a decorative sheet laminating apparatus, the present invention can be applied to an OVL forming apparatus as well, and in that case as well. It will be apparent to those skilled in the art that the same effects as those of the above-described example can be obtained. Further, although the ventilation passage 20 of the above-described example has a semicircular cross section,
It goes without saying that the shape and position of the ventilation passage 20 may be appropriately changed according to the size and shape of the product.

[0033]

As can be understood from the above description, according to the decorative sheet laminating / molding apparatus of the present invention, the base material mounting surface having a mounting surface which is slightly narrower than the bottom surface shape of the molding base material as a whole is mounted. Since a plurality of vertical groove-shaped ventilation passages that are opened laterally on the side periphery of the mounting jig and that are continuous from the mounting surface to the ventilation holes formed in the suction mounting table are provided, a decorative sheet or a rubber-like elastic film is provided. The air in the closed space formed between the suction table and the suction table can be sufficiently degassed through the vent hole formed in the suction table, and as a result, the adhesion of the decorative sheet to the molding substrate and the molding substrate It is possible to improve the wrap-around property to the back side of the lower part, and it is possible to prevent molding defects such as swelling, transfer defects and wrinkles on the outer surface of the product, and even if the product has a complicated external shape, the decorative sheet can be properly applied to the bottom surface. Can be glued to.

[Brief description of drawings]

FIG. 1 is a view showing an embodiment of a decorative sheet laminating apparatus according to the present invention.

FIG. 2 is a diagram which is used for describing a main part of the embodiment.

FIG. 3 is a diagram which is used for describing a procedure of an example.

FIG. 4 is a diagram provided for explaining a conventional vacuum press laminating apparatus.

[Explanation of symbols]

1 Molding base material 10 Vacuum press lamination molding equipment 11 Seat side chamber 14 Rubber-like elastic film 15 heater 16,26 supply / discharge port 18 Substrate placement jig 20 Ventilation passage 22 Suction table 24 frame 25 vents S makeup sheet

Claims (2)

(57) [Claims] 1. A box-shaped base in which a downward opening is closed by a rubber-like elastic film and a sheet-side chamber and a suction table having a vent are installed in the upward opening. A material side chamber and a base material mounting jig arranged on the suction table, a molding base material is arranged on the base material mounting jig, and a decorative sheet is formed on the molding base material. Is set, a mold is clamped between the seat side chamber and the base material side chamber to form a closed space between the rubber-like elastic film and the suction table, and the seat side chamber is provided. While heating the rubber-like elastic film by the heater, the air in the closed space is vacuum-sucked through the ventilation hole formed in the suction table, and the interior of the seat-side chamber is pressurized if necessary, whereby the makeup is applied. Heat softening the sheet with the rubber-like elastic film In the decorative sheet laminating apparatus adapted to be pressed and adhered to the outer surface of the molding substrate while being placed, when the substrate mounting jig has a mounting surface size of the molding substrate arranged Is a size that can fit in the bottom surface of the molding base material, has a side opening in the side peripheral portion of the base material mounting jig, and is formed on the suction mounting table from the mounting surface side. A decorative sheet laminating apparatus having a plurality of vertical groove-shaped ventilation passages connected to pores. 2. A suction table having a sheet side chamber and a base material side chamber which are partitioned by a decorative sheet, and a ventilation hole is formed in the base material side chamber , and
A base material mounting jig is arranged on the suction table, and a molding base material is arranged on the base material mounting jig, and the decorative sheet is heated by a heater provided in the seat side chamber. While, by vacuum suction the air in the closed space formed between the decorative sheet and the suction table through the ventilation hole formed in the suction table and pressurizing the upper chamber as necessary, In the decorative sheet laminating apparatus, the decorative sheet laminate molding apparatus is configured to be pressed and adhered to the outer surface of the molded substrate by the pressure difference between the upper chamber and the lower chamber while heating and softening the decorative sheet. Is a size such that the mounting surface can enter into the bottom surface of the molding substrate when the molding substrate is arranged, and the side surface of the substrate mounting jig is lateral. Open from the front side Decorative sheet laminated molding apparatus longitudinal groove-like ventilation passage communicating with the vent hole formed in the serial suction table is characterized in that is provided with a plurality places.