JPH0351127A - Molding method for laminated sheet - Google Patents

Abstract

PURPOSE:To obtain sufficiently high pressurization force and to enable continuous molding while interlocking with the continuous laminating stage of a base material by successively inserting material to be molded which is not pressurized and heated between the pressurization and heating plates and taking out the material which has been completed in pressurization and heating and alternately repeating pressurization and pressure release due to the pressurization and heating plates. CONSTITUTION:A material C to be molded which is not completed in pressurization and heating and is utilized for a laminated sheet is inserted into a pressure chamber 7c with the materials C, C... to be molded held therein from an insertion port 9. The inside of the chamber 7c is heated by a heating means in a state wherein a plurality of sheets of the materials to be molded for the laminated sheet are inserted into the chamber 7c. Simultaneously pressurization due to the pressure chambers 7, 7 is performed by actuating the hydraulic cylinders 8, 8.... After lapse of prescribed time, pressurization is released. At a time of this pressure release, one sheet of laminated sheet D is taken out from a takeout 10 which has been stagnated only for the controlled longest time, pressurized and heated. The following material C to be molded for the laminated sheet is inserted into the chamber 7c from the insertion port 9 and this operation is repeatedly performed. Thereby high pressurization force can be imparted to the material C to be molded. The laminated sheet D can be continuously and efficiently produced while inter-locking with the laminating layer of the base material.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a method for forming laminates and metal foil-covered laminates used for printed wiring boards and the like.

[Prior Art] Conventionally, as a method for continuously forming such a laminate, there are a method using a pressure heating device such as a hot press, a method using an endless belt, and the like. In a method using an endless belt, for example, a material to be formed to become a laminate is inserted between a pair of endless belts and transferred, and pressure is applied by a pair of pressure rolls during the transfer. Publication), or one that pressurizes with caterpillars during transportation (Japanese Patent Laid-Open No. 471425
5), or by supplying pressurized fluid to a fixed pressure chamber provided on the outside of the endless belt and pressurizing the endless belt with this fluid pressure (Japanese Patent Application Laid-Open No. 62-21211).
Several methods have been adopted, including the following:

[Problems to be Solved by the Invention] However, in the method using a pressurizing and heating device such as a hot press described above, although a sufficiently high pressurizing force can be obtained, the pressurizing and heating process is not completed in a complete batch. Because this method requires continuous lamination of base materials, it is not possible to perform continuous molding in conjunction with the second step.

Further, in the method using an endless belt, although the material to be formed can be continuously transferred and a laminate can be formed efficiently, there is a drawback that the pressing force during forming is insufficient. In particular, when using condensation thermosetting resins such as phenolic resins, volume decreases due to the curing reaction, and a high pressure of approximately 50 kg/cyz" or more is required to compensate for this volume decrease. Therefore, it was difficult to obtain a laminate with good mechanical properties using the pressing force obtained by this method.

Therefore, it is an object of the present invention to provide a method for forming a laminate that can obtain a sufficiently high pressing force and that can be continuously formed in conjunction with the continuous lamination process of base materials.

[Means for Solving the Problems] The present invention involves cutting a molded article for a laminate, which is formed by continuously laminating and integrating a plurality of base materials impregnated with a thermosetting resin, into a desired length, When forming a plurality of laminates by inserting the plurality of sheets with a pressure heating plate and pressurizing and heating them, pressurization and pressure release by the pressure heating plate are performed alternately, and when the pressure is released,
An unpressurized and heated laminate material is inserted between one pressure heating plate and the laminate material adjacent thereto, and the laminate material adjacent to the other pressure heating plate is inserted. By repeating the process of taking out and then applying pressure, the pressure heating plate is made horizontal, and the material to be formed for the laminate is inserted and the &1 layer board is taken out, both above and below the pressure plate of the pressure heating plate. By inverting and performing both on the upper surface, problem L was solved.

[Function] According to such a method, when molding a laminate that requires high pressure or long-time heating, such as a phenol resin laminate or a copper foil-clad rifhenol resin laminate,
It is possible to maintain the pressurized and heated state at a high pressure for a relatively long desired period of time.
It is possible to obtain a laminate board that is durable. Furthermore, according to the method described above, it is possible to perform continuous molding in conjunction with continuous lamination of base materials, so that rationalization of molding can be realized. Particularly, according to the method according to claim 2, there is an advantage that the work is made easier and, secondly, the occurrence of old scratches due to friction when taking out the laminate is suppressed, and high mechanical properties can be ensured. .

Hereinafter, the present invention will be described in detail with reference to embodiments and drawings.

[Example] Figures 1 to 4 show an example of an apparatus suitably used in the method for forming a laminate of the present invention.
FIG. 1 is a configuration diagram showing an example of a device for manufacturing a molded article for a laminate, and FIGS. 2 to 4 are configuration diagrams showing an example of a molding device for molding a laminate. .

The laminated plate forming object manufacturing apparatus shown in FIG. 1 includes a rolling roll 1.
1..., an impregnation tank 22 for impregnating each of these base materials A, A... with thermosetting resin liquid B, and after laminating the impregnated base materials, a spacer is applied to the surface. What are the female mold sheet feeding device 43 that supplies the mold sheet, the precuring rule 4 that transports this laminated base material while precuring it, and the cutter 5 that cuts this laminated base material to a predetermined length? The laminated base material obtained by this apparatus will become the molded object C in the later laminated board molding process. Moreover, this laminated expropriation molded article manufacturing apparatus is provided with a metal foil supply device 6 for supplying metal foil to the surface of the base material after lamination, if necessary. This metal foil supply device 6 includes an unwinding roll 6a for feeding out the metal foil, a coating device 6b for applying adhesive to the metal foil, and a drying oven for drying or semi-drying the applied adhesive. 6c.

Next, the apparatus shown in FIGS. 2 to 4 is an example of a molding apparatus for continuously molding the laminate material C obtained by molding using the apparatus shown in FIG. They are a top view and a side view.

Reference numeral 7.7 in the figure represents a pair of pressure heating plates (hereinafter abbreviated as pressure plates). This pressure plate 7.7 is a thick plate made of high-rigidity steel or the like, and includes a substantially rectangular upper pressure plate 127a and a substantially valve box-shaped lower pressure plate 7b with an open top and side surfaces 1-1. are arranged so as to face each other with a space forming a pressurizing chamber between the respective pressurizing plates. A heating means such as an electric heater for heating is built inside the pressurizing plates 7a and 7b, so that the inside of the pressurizing chamber 7C can be heated. In addition, these pressure plates 7 a, 7
A plurality of hydraulic cylinders 8, 8, . . . for pressure plate pressure and release are provided on both side edges of b. The tip of the piston rod of this hydraulic cylinder 8°8... is connected to the lower pressure plate 7.
The hydraulic cylinders 8, 8, . And pressure plate 7
．． 7 is such that when the piston rod of the hydraulic cylinder 8.8... is extended, the pressure plate 7.7 is clamped, and when the piston rod of the hydraulic cylinder 8.8... is shortened, the pressure plate 7.7 is compressed. , one pressure plate 7 is pressed outward and the pressure is released.

In addition, one side of the pressurizing chamber 7c, which corresponds to the open side surface of the lower pressurizing plate 7b, is open at its upper and lower parts, and the area between the upper and lower parts is a laminated plate. The lower opening serves as an insertion port 9 for inserting the molded object C, and the outlet 10 serves as an outlet for taking out the molded material, which is sequentially fed from above and pressurized into a laminate. There is.

Further, on both sides adjacent to the side where the insertion port and the removal port are provided, there are provided reversing shafts 11 for reversing the entire molding apparatus u upside down.

Further, a hydraulic drive circuit (not shown) for driving the hydraulic cylinders 8,8... and a reversing shaft drive device (not shown) for driving the reversing shaft 11 are provided, and these hydraulic driving circuits and A control section (not shown) is provided to control the operation of the drive device. Then, the hydraulic drive circuit is actuated by the control signal from the control section, and the hydraulic cylinder 8.8
... are controlled to operate periodically at predetermined intervals. As a result, the pressure plate 7
．． 7, pressurization and pressure release are performed alternately and periodically.

In addition, by receiving a control signal and operating the reversing shaft drive device, the reversing shaft +1 is moved 180' at a predetermined interval.
As the molding device rotates, the upper and lower surfaces of the entire molding device periodically rotate in reverse and in the normal direction.

Next, an example of a method for forming a laminate using this forming apparatus will be described.

First, a preforming device as shown in Fig. 1 is used once a month to form a plurality of long sheet-like base materials A, A, etc. such as kraft paper, linter paper, glass cloth, carbon fiber cloth, etc. The base materials A, A...
It is sent into the molding equipment by .... These base materials Δ, A... are stored with uncured resin liquid B of thermosetting resin such as unsaturated h1 polyester resin, noaryl phthalate resin, Evoquin resin, phenol resin, melamine resin, etc. These thermosetting resin liquids B are impregnated through the impregnating tanks 2, 2, . . .

Next, these resin liquid-impregnated base materials are stacked one on top of the other, and metal foil such as copper foil supplied from the metal foil supply device 6 is laminated on one or both sides of the stack as necessary. It is inserted with a release film such as a polyester film supplied from the release note supply device 3, and transported while being precured by precuring rolls 4, 4, and then cut into a predetermined length by a cutter 5. A molded article C for a laminate is obtained.

Next, this laminate plate forming object C is
It is sent into the molding device shown in the figure and molded.

During molding, a hydraulic cylinder 8 as shown in FIG.
．． According to the timing diagram of the operation in 8..., pressurization and pressure release, insertion of the object to be formed into a laminate, and removal of the laminate are performed.

Specifically, first, a laminate workpiece C that has not been pressurized and heated is inserted through the insertion port 9 into a pressurizing chamber 7c containing a plurality of laminate workpieces C1C... do. With a plurality of laminate plate forming objects C1C... inserted into the pressurizing chamber 7c, the inside of the pressurizing chamber 7c is heated by the heating means, and at the same time, the hydraulic cylinders 8,8... are operated. Then, pressure is applied by the pressure plate 7.7. After a predetermined period of time, the pressure is released, and when the pressure is released, the piece of laminate that has been kept under pressure and heated for the longest and controlled time is removed from the outlet lO, and then the next laminate sheath is removed. This operation is repeated, such as inserting the molded product C into the pressurizing chamber 7c through the insertion port 9.

The time for one cycle of periodic pressurization and pressure release of the pressure plate 7.7 is preferably shorter than 115 times the curing time of the thermosetting resin B used here.

The curing time of the thermosetting resin B also depends on the heating temperature by the pressure plate, and by determining these, the time for one cycle is determined. ! If the cycle time is set to 115 times or more of the curing time of thermosetting resin B, the characteristics of batch processing will become apparent, and manufacturing discontinuity will increase. Furthermore, the pressure release time is one of the times of one cycle.
It is desirable to set it to /3 or less. If this time is ⅓ or more, air will enter between the laminate objects from the side edges of the laminate objects C when the pressure is released. In addition, the distance between the pressure plates 7, 7 when the pressure of the pressure plates 7, 7 is released is approximately 61 (1 + 1) wider than the thickness of the object C, so that the piston rods of the hydraulic cylinders 8, 8... It is preferable that the stroke of the pressure plate 7.7 is determined.
When the pressure is released once, it is preferable that the molded object C moves within the pressurizing chamber 7c by the thickness of one plate, and is taken out from the pressurizing chamber 7C after 50 to 500 movements.

By such a method, the laminate to be formed C which has been sequentially inserted into the pressurizing chamber 7c is subjected to periodic pressurization by the pressurizing plate 7.7, and bubbles are removed from the pressurizing plate 7.7. 7.7
The resin impregnated into the base material is cured by the heat from the base material, and a laminated board is obtained from the molded article in which each base material is joined and integrated.

Furthermore, as mentioned above, one object to be formed C is pressed and released several times while being inserted between the pressure plates 7 and 7, so although the pressure is applied intermittently, the In some cases, a sufficiently high pressure can be applied to the molded object, and even if resins such as phenolic resins are used, which do not produce reaction by-products such as condensed water or gas during curing, the base material has high m content and high strength. A laminated layer 1ijD of can be obtained. In addition, it is possible to pressurize and heat for a long time, and it is possible to efficiently produce a laminated board continuously with the base material lamination.

Also, place the above pressure device so that the pressure heating plate is vertical, insert the object C to be formed into a laminate when releasing the pressure, and insert the laminate! ) can be taken out without friction with the adjacent surface, which is convenient i11.

In the method according to a second aspect of the present invention, the reversing shaft drive device is further operated during pressurization to rotate the entire molding apparatus by 180 degrees. Specifically, as shown in FIG. 5, during heating after inserting the molded object C and before taking out the laminate, the apparatus is set so that the upper pressure plate 7a and the lower pressure plate 7b are in an upside-down state. After rotating the whole thing and removing the laminate,
When pressurizing before inserting the next object C, rotate the upper pressure plate 7a and the lower pressure plate 7b in the normal direction so that they return to their original positions.

According to this method, when inserting the molded object C, the insertion opening 9
is located at the top of the device, and when the laminate l) is taken out from the IIM, the ejection port 10 is located at the top of the device, so insertion of these molded objects C and removal of the laminate ND are always done at the top of the device, i.e. This is carried out at the top of the laminate in the pressurizing chamber 7c. Therefore, these insertion and removal operations can be carried out without difficulty, and there is an advantage that damage due to friction between the laminates does not occur, and laminates with good mechanical properties can be obtained.

[Effects of the Invention] - As explained above, the method for forming a laminate of the present invention involves applying pressure to a laminate-forming object formed by laminating and integrating a plurality of base materials impregnated with a thermosetting resin. When molding a laminate by inserting them with heating plates and applying pressure and heat, unpressurized and heat-treated molded products are successively inserted between the pressure and heat plates, and the ones that have been subjected to pressure and heat treatment are taken out and pressed. Since the heating plate pressurizes and releases the pressure alternately, it is possible to apply long-term heating and high pressure to the molded objects while sequentially moving the laminated objects to be formed. Even when using resins that produce reaction by-products during curing,
Laminates with high substrate content and excellent mechanical properties can be efficiently produced in conjunction with substrate lamination, continuously and without the use of lamination equipment.

In addition, as described in claim 2, if a water (1L-shaped pressurizing device is used and the entire pressurizing and heating plate is rotated up and down 180° when pressurizing, the material to be formed for the laminate can be inserted and the laminate can be formed. Removal is always carried out at the top of the device, that is, at the top of the object to be formed or the laminate inserted between the pressure plates.Therefore, these insertion and removal operations are carried out without difficulty, and the laminates are separated from each other or the laminates are separated. This has the advantage that damage caused by friction between the pressurized heating plate and the pressurized heating plate is suppressed, and high surface accuracy and mechanical properties can be ensured.

[Brief explanation of drawings]

FIG. 1 is a schematic cross-sectional view showing an example of an apparatus for manufacturing a laminate to be molded used in the laminate molding method of the present invention, and FIGS. FIG. 2 is a configuration diagram showing an example of a device used for
3 is a cross-sectional view, FIG. 3 is a surface view, and FIG. 4 is a side view. FIG. 5 is a timing chart showing an example of the operation of this molding device. A: Base material, B: Thermosetting resin, C:
...Object to be molded, D...Laminated plate, 7...
...Heating and pressure plate.

Claims (2)

[Claims] (1) A molded article for a laminate, which is made by laminating and integrating a plurality of base materials impregnated with thermosetting resin in a connected manner, is cut to a desired length, and the plurality of sheets are inserted using a pressure heating plate. When forming multiple laminate plates by applying pressure and heating, the pressure is applied and the pressure released by the pressure heating plate alternately, and when the pressure is released, one pressure heating plate and the laminate adjacent to it are It is characterized by inserting a pressurized and unheated laminate plate molding object between the molded objects, taking out the laminate adjacent to the other pressure heating plate, and then repeating the process of applying pressure. How to form laminates. (2) Using a pressure heating plate maintained horizontally, when releasing the pressure, insert the unpressurized and heated laminate to be formed into the upper pressure heating plate, apply pressure, and at the time of applying pressure, Claim 1 characterized in that after the entire heating plate is rotated up and down by 180 degrees, the pressure is released and the laminated plate below the pressurized heating plate that has come above is taken out.
The method for forming a laminate described in .