JP3016518B2 - Vacuum lamination molding method and apparatus - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vacuum lamination molding method and apparatus, and more particularly to a vacuum lamination molding method and apparatus for tightly laminating a synthetic resin decorative sheet on which a pattern or the like is printed on the outer surface of a laminated substrate. Is what you do.

[0002]

2. Description of the Related Art For laminating, hot stamping transfer, etc., a vacuum laminating molding method (closely laminating a decorative sheet made of a thermoreactive synthetic resin on which a pattern or the like is printed on the outer surface of a laminating base material ( OVL), a decorative sheet to be laminated and a laminated base material on which the decorative sheet is laminated are disposed to face each other, and the first chamber is arranged on the laminated substrate side by the decorative sheet, and the second chamber is arranged on the opposite side. Airtightly partitioned, the decorative sheet is softened by heating, and the first chamber and the second chamber are depressurized equally to make both chambers substantially in a vacuum state. A vacuum lamination molding method has been already proposed in which the decorative sheet is released and adhered and laminated on the outer surface of the laminated base material by the differential pressure between the first chamber and the second chamber. -45768, JP-A-56-996 No. 4 is shown like in Japanese.

[0003]

In the vacuum lamination molding method as described above, the first chamber and the second chamber are depressurized equally, and a sufficient vacuum is applied between the decorative sheet and the laminated substrate. After that, the decompression of the second chamber is released and a differential pressure is applied to the decorative sheet, so that only the first chamber is depressurized and a differential pressure is applied to the decorative sheet to laminate the decorative sheet. Air is less likely to be trapped between the laminated surfaces of the decorative sheet and the laminated substrate as compared to the case where the decorative sheet is in close contact with the outer surface of the substrate. When the decorative sheet and the laminated base material are laminated in a state in which the decorative sheet is first in contact, the lateral movement of the decorative sheet with respect to the laminated base material is restrained, and the decorative sheet is stuck to the outer surface of the laminated base material. When the decorative sheet is wrinkled, Between the base there is a possibility that not favorably adhered. In this case, the printed pattern by the decorative sheet is disturbed.

[0004] The present invention has been made by focusing on the above-mentioned problems in the conventional vacuum lamination molding method.
Vacuum lamination to prevent the decorative sheet from wrinkling when a synthetic resin sheet such as a decorative sheet is adhered to the outer surface of the laminated base material and to ensure that the decorative sheet and the laminated base material are always in good contact. It is an object of the present invention to provide a molding method and a vacuum lamination molding apparatus used for carrying out the method.

[0005]

SUMMARY OF THE INVENTION According to the present invention, a synthetic resin sheet to be laminated and a laminated base material on which the synthetic resin sheet is laminated are arranged to face each other. By laminating the first chamber on the side of the laminated base material, the second chamber on the opposite side is airtightly partitioned from each other, and the pressure of the first chamber is reduced while the pressure of the first chamber is reduced. The pressure is reduced by a predetermined amount less, and the synthetic resin sheet is brought into contact with the laminated base material in this state, and thereafter, the pressure in the second chamber is released to release the first chamber and the second chamber. This is achieved by a vacuum laminating method characterized in that the synthetic resin sheet is closely adhered and laminated on the outer surface of the laminated base material by the differential pressure of the chamber.

Another object of the present invention is to provide a closed container that can be opened and closed, a laminated base mounting table provided in the closed container, a multilayer base mounting table facing the laminated base mounting table in the closed container, and The first chamber on the side of the laminated substrate mounting table, a synthetic resin sheet holding means for holding a synthetic resin sheet to partition the second chamber airtight from each other on the opposite side, the first chamber the first chamber And a pressure reducing means for selectively reducing the pressure in the second chamber at a second value smaller than the first value. You.

Still another object of the present invention is to provide a transfer sheet comprising a transfer layer formed on a synthetic resin release sheet to be laminated and a laminated base material on which the transfer sheet is laminated. The first chamber is disposed on the laminated base material side by the transfer sheet, and the second chamber is airtightly partitioned on the opposite side by the transfer sheet, and the first chamber is depressurized while the pressure is reduced. The second chamber is depressurized to a degree smaller than the depressurization of the first chamber by a predetermined amount, and in this state, the transfer sheet is brought into contact with the laminated base material. Release and tightly laminate the transfer sheet on the outer surface of the laminated base material by the differential pressure between the first chamber and the second chamber, and then release the release sheet, leaving only the transfer layer on the laminated base material. This is achieved by a vacuum lamination molding method characterized by transferring to the side.

[0008] The method and apparatus of the present invention can be used not only for simple lamination of a synthetic resin sheet on a laminated base material, that is, for so-called lamination, but also for lamination of a synthetic resin sheet when transferring to a laminated base material. Can be.

[0009]

According to the vacuum lamination molding method and apparatus of the present invention, in the step of depressurizing the first chamber and the second chamber,
By keeping the decompression of the second chamber lower by a predetermined amount than the decompression of the first chamber, the pressure of the second chamber is kept slightly higher than the pressure of the first chamber, whereby the synthetic resin sheet is Due to the pressure difference between the first chamber and the second chamber, the pressure chamber slightly expands toward the first chamber and expands spherically. As a result, the synthetic resin sheet comes into contact with the outer surface of the laminated base material from the tip of the bulging portion located at the center of the synthetic resin sheet. The resin sheet first comes into contact with the central portion of the laminated base material at the tip of the bulging portion, and in the subsequent process of attaching the synthetic resin sheet to the laminated base material, The lateral movement is not restricted, and the decorative sheet does not wrinkle when the decorative sheet is attached to the outer surface of the laminated base material. Therefore, even when the transfer is performed to the laminated base material, the transfer does not occur due to the disorder of the pattern.

[0010]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing a first embodiment of the present invention; FIG. 1 shows an embodiment of a vacuum lamination molding apparatus according to the present invention. The vacuum lamination molding apparatus has a closed container 4 that can be opened and closed by a fixed lower container 2 and a movable upper container 3 on a base 1.

In the lower container 2, a laminated base mounting table 5 is provided. The laminated substrate mounting table 5 supports the laminated substrate W, is fixed to the upper end of the piston rod 7 of the hydraulic cylinder device 6 fixed to the base 1, and is moved up and down by the hydraulic cylinder device 6. Has become. A synthetic resin sheet mounting portion 8 is provided at an upper opening edge of the lower container 2.

The upper container 3 is fixed to the lower end of a piston rod 11 of a hydraulic cylinder device 10 fixed to an upper frame 9, and is moved up and down by the hydraulic cylinder device 10 to open and close the closed container 4. ing. A sheet heating heater 12 is attached to a ceiling surface in the upper container 3.
The lower container 2 and the upper container 3 have pneumatic ports 13, 1 respectively.
4 are provided. Pneumatic port 13 of lower container 2
Is connected to a switching valve 16 through a conduit 15, and the switching operation of the switching valve 16 can selectively supply the negative pressure and the atmospheric pressure from the vacuum pump 17 and the conduit 18. The pneumatic port 14 of the upper container 3 is connected to a switching valve 20 via a conduit 19, and the switching operation of the switching valve 20 causes the vacuum pump 1 to operate.
7. The negative pressure from the conduits 18 and 21 and the air pressure from the pneumatic pump 22 and the conduit 23 and the atmospheric pressure can be selectively supplied.

The conduit 21 is provided with a relief valve 24. The relief valve 24 releases a part of the negative pressure from the vacuum pump 17 and makes the negative pressure applied to the pneumatic port 14 smaller than the negative pressure applied to the pneumatic port 13 by a predetermined amount. The relief valve 24 may be configured to respond to the negative pressure applied to the pneumatic port 13 and to perform a relief operation in accordance with the negative pressure applied to the pneumatic port 13.

Next, the operation of the vacuum laminating apparatus having the above-described configuration will be described. First, the upper container 3 is moved upward by the hydraulic cylinder device 10 to
The laminated base material W is placed on the central part of the laminated base placing table 5 in the lower container 2 in a state where is opened, and the entire peripheral edge of the decorative sheet S is attached to the synthetic resin sheet mounting portion 8 of the lower container 2. It is airtightly fixed by tightening the peripheral edge with a fixing frame. Thereafter, the upper container 3 is moved downward by the hydraulic cylinder device 10 to close the closed container 4. Thereby, the decorative sheet S faces the laminated base material W on the laminated base mounting table 5 in the closed container 4, and the first chamber A is placed on the laminated base mounting table side, that is, the lower container 2 side, and the opposite side. , That is, the second chamber B on the upper container 3 side
Are airtightly partitioned from each other.

In this state, the decorative sheet S is heated and softened by the sheet heating heater 12. Next, switching valve 1
The negative pressure of the vacuum pump 17 is supplied to the pneumatic ports 13 and 14 by the switching operations of the switches 6 and 20, and the pressure in the first chamber A and the second chamber B is reduced. Since the negative pressure applied to the pneumatic port 14 is smaller than the negative pressure applied to the pneumatic port 13 by the relief valve 24 by a predetermined amount, the pressure in the second chamber B is maintained slightly higher than the pressure in the first chamber A. Thereby, as shown in FIG. 2, the decorative sheet S bulges into a spherical shape so as to bulge toward the first chamber A due to a pressure difference between the first chamber A and the second chamber B. Become like

Next, when the laminated substrate mounting table 5 is lifted by the fluid pressure cylinder device 6, the decorative sheet S is placed at the tip (lowest lower end) of the bulging portion located at the center of the sheet. First, it comes into contact with the center of the upper surface of the upper laminated base material W. As a result, the subsequent laminated substrate mounting table 5
In the process of attaching the decorative sheet S to the laminated base material W due to the rise of the decorative sheet S, the decorative sheet S is not restrained from moving in the lateral direction with respect to the laminated base material W without wrinkles on the outer surface of the laminated base material W. , From the center of the upper surface to the peripheral portion of the upper surface and further to the side surface portion.

Next, by the switching operation of the switching valve 20, the atmospheric pressure and the air pressure are further supplied to the pneumatic port 14 from the pneumatic pump 22, so that the second chamber B is in a pressurized air state, and the first chamber A and the second chamber Sheet S due to the large pressure difference between
As shown in FIG. 3, is pressed against the outer surface of the laminated base material W, and is laminated in a close contact state without wrinkling. At this time, the pressure in the second chamber B may be the atmospheric pressure, but it is preferable that the pressure is further increased by about 3 kg / cm ² from the atmospheric pressure by the pneumatic pump 22. Further, in order to perform the above-mentioned reduced pressure and air pressure supply within a short period of time and in a state where the pressurized and depressurized state is stable, as shown in FIG. A container 26 is preferably installed in each of the conduits. Also,
In carrying out the present invention, it is also possible to use a transfer sheet as the decorative sheet S, in which case the transfer sheet side of the decorative sheet is laminated so as to face the laminated base material side, and after lamination, an unnecessary release sheet is used. Only peel off and remove.

Examples of the material of the decorative sheet S include polyvinyl chloride such as polyvinyl chloride, polyvinylidene chloride, polyvinyl acetate-vinyl chloride copolymer, polyvinyl fluoride, polyvinyl butyral, and polyvinylidene fluoride; polystyrene; acrylic styrene; Styrene resin such as ABS,
Acrylic resin such as polyethyl methacrylate, polymethyl methacrylate, polyacrylonitrile, polyethylene,
Polyolefins such as polypropylene and polymethylpentene; cellulose derivatives such as cellulose acetate and nitrocellulose; polyamide resins such as nylon 6 and nylon 66; resin,
Rubber-based resins such as butadiene, chloroprene rubber, and silicone rubber; polyvinyl alcohol-based resins such as vinylon and polyvinyl alcohol; and polycarbonate boats. The thickness may be about 20 to 200 μm, particularly from the viewpoint of moldability. It is desirable that the thickness be 50 to 100 μm.

The decorative sheet S may be subjected to coloring, printing of various patterns, embossing, metal deposition, or the like to impart design properties. Further, in order to improve the adhesiveness between the decorative sheet S and the laminated base material W, the sheet surface may be subjected to corona discharge treatment, various known primer coating, and the like. Further, the decorative sheet S may be a transfer sheet. As a configuration of the transfer sheet, a transfer layer is formed on a release sheet, and as the release sheet, polyester such as polyethylene terephthalate, polyethylene, polypropylene, a synthetic resin sheet such as polyolefin such as polymethylpentene, paper, A nonwoven fabric or the like, further, if necessary, a known release layer formed of polyolefin, melamine, a silicone resin, or the like is used. The transfer layer is, in order from the release sheet side, a release layer, a pattern layer, and a metal. A decorative layer such as a vapor-deposited layer and an adhesive layer are formed, and the peeling layer and the adhesive layer may be omitted in some cases. The resin vehicle used for the release layer, pattern ink, adhesive, etc. is acrylic, vinyl chloride / vinyl acetate copolymer, polyester,
Known materials such as epoxy and urethane may be used, and known materials may also be used for the pigment and the deposited metal layer.

[0020]

As will be understood from the above description, according to the vacuum lamination molding method and apparatus of the present invention, in the step of depressurizing the first chamber and the second chamber, the second chamber is formed. The pressure in the second chamber is kept slightly higher than the pressure in the first chamber by reducing the depressurization of the first chamber by a predetermined amount from the depressurization of the first chamber. The synthetic resin sheet expands toward the first chamber due to the pressure difference with the chamber, so that the synthetic resin sheet expands in a spherical shape from the front end of the swelling portion located at the center of the synthetic resin sheet. If the position of the laminated substrate relative to the synthetic resin sheet is appropriate, the synthetic resin sheet will first come into contact with the center of the laminated substrate at the tip of the bulging portion. In the subsequent process of attaching the synthetic resin sheet to the Without lateral movement is restricted with respect to the laminated base material of the sheet, causing no wrinkles in the decorative sheet when the decorative sheet is attached on the outer surface of the layered base.

As a result, the decorative sheet and the laminated base material are always in good contact with each other, and so-called lamination and transfer can be performed satisfactorily.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram showing an embodiment of a vacuum lamination molding apparatus according to the present invention.

FIG. 2 is an explanatory view showing one step in a vacuum lamination molding method according to the present invention.

FIG. 3 is an explanatory view showing another step in the vacuum lamination molding method according to the present invention.

FIG. 4 is a schematic configuration diagram showing another embodiment of the vacuum lamination molding apparatus according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Base 2 Lower container 3 Upper container 4 Airtight container 5 Laminated substrate mounting table 12 Heater for sheet heating 13 Pneumatic port 14 Pneumatic port 16 Switching valve 17 Vacuum pump 20 Switching valve 22 Pneumatic pump 24 Relief valve 25 Vacuum reservoir 26 Air Reservoir A A First chamber B Second chamber S Decorative sheet W Laminated substrate

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Masayuki Shibata 1-1-1 Ichigaya-Kaga-cho, Shinjuku-ku, Tokyo Dai Nippon Printing Co., Ltd. (56) References JP-A-54-132675 (JP, A) JP-A-56-99624 (JP, A) JP-A-1-157829 (JP, A) JP-A-4-135825 (JP, A) JP-A-3-150126 (JP, A) JP-A-2-139222 (JP JP, A) JP-A-64-56527 (JP, A) JP-A-57-11024 (JP, A) JP-A-3-207631 (JP, A) JP-A-63-197625 (JP, A) 62-268700 (JP, A) JP-A-1-176541 (JP, A) JP-A-50-13450 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) B29C 51 / 10 B29C 51/14

Claims (3)

(57) [Claims] 1. A synthetic resin sheet to be laminated and a laminated base material on which the synthetic resin sheet is laminated are opposed to each other, and a first chamber is provided on the laminated base material side by the synthetic resin sheet, and a second chamber is provided on the opposite side. Chambers are airtightly partitioned from each other, and the pressure in the first chamber is reduced while the pressure in the second chamber is reduced by a predetermined amount less than the pressure in the first chamber. The sheet and the laminated base material are brought into contact with each other, and thereafter, the decompression of the second chamber is released, and the synthetic resin sheet is subjected to a pressure difference between the first chamber and the second chamber to form an outer surface of the laminated base material. A vacuum lamination molding method, wherein the lamination is performed in close contact. 2. A closed container that can be opened and closed, a laminated substrate mounting table provided in the closed container, and a surface of the laminated substrate mounting table facing the laminated substrate mounting table in the closed container. A first chamber, a synthetic resin sheet holding means for holding a synthetic resin sheet so as to airtightly partition the second chamber on the opposite side,
Pressure reducing means for reducing the pressure in the first chamber at a first value and selectively reducing the pressure in the second chamber at a second value smaller than the first value. Vacuum lamination molding equipment. 3. A transfer sheet formed by forming a transfer layer on a synthetic resin release sheet to be laminated and a laminated base material on which the transfer sheet is laminated are opposed to each other so that the transfer layer and the laminated base material face each other. The transfer sheet is used to partition the first chamber on the side of the laminated base material and the second chamber on the opposite side in an airtight manner, and to decompress the first chamber and divide the second chamber into the first chamber. The pressure is reduced by a predetermined amount less than the pressure in the first chamber. In this state, the transfer sheet is brought into contact with the laminated base material, and then the pressure in the second chamber is released to release the first chamber. And the transfer sheet is closely adhered and laminated to the outer surface of the laminated base material by the differential pressure of the second chamber, and thereafter, the release sheet is peeled off, and only the transfer layer is transferred to the laminated base material side. Vacuum lamination molding method.