JP2000094622A - Manufacture of laminate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent occurrence of a deformation at a cooling plate by conducting a heating pressure molding, then repeating releasing pressurizing and pressurizing while starting cooling by the plate, and thereafter cooling while again maintaining the pressurizing. SOLUTION: Releasing of pressurizing and pressurizing are repeated until a temperature of a cooling plate 3 is lowered to a range of 70 to 100 deg.C. Thus, the plate 3 is quenched, a mirror plate 2 brought into contact with the plate 3 is quenched, and a large difference of shrinkages of the plate 3 and the plate 2 occurs by a difference of linear expansion coefficients of an aluminum and a stainless steel. However, in the case of releasing the pressurizing, press bonding of the plate 3 to the plate 2 is released, slid each other, the plates 2, 3 are freely shrunk in sizes according to the coefficients, and a deformation caused by the difference of the size shrinkages of the plates 3 and 2 can be prevented. Particularly, the deformation of the plate 3 made of the aluminum having a weak strength can be effectively prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a laminate used by processing a printed wiring board.

[0002]

2. Description of the Related Art A laminate for processing into a printed wiring board is first prepared by impregnating a varnish of a thermosetting resin such as an epoxy resin into a base material such as a glass cloth and drying to prepare a B-stage prepreg. The prepreg is manufactured by laminating a required number of prepregs, laminating a metal foil such as a copper foil on one or both outer surfaces thereof, and subjecting the prepreg to heat and pressure molding.

FIG. 5 schematically shows an example of a general laminating apparatus for producing a laminated body. A prepreg 1 in which a required number of laminated prepregs 1 are laminated with metal foils 6 on both outer surfaces is shown. A set of the moldings 5 is formed, and the moldings 5 are
Are stacked in a plurality of stages through the hot platen 8,
Pressing with a press plate (not shown) while heating at, forms the product. At least in part, the molded body 5 is stacked using the mirror plate 2 on both sides of the cooling plate 3. After molding by heating and pressing, the molded body 5 is removed. The laminate obtained by molding is cooled by the cooling plate 3.

FIG. 6 schematically shows another example of a laminating apparatus for producing a laminate. In this device, a long metal foil 6 is used, a required number of prepregs 1 are sandwiched at predetermined intervals between two metal foils 6, and the required number of prepregs 1 and the metal foils 6 stacked on both sides thereof are separated. As a set of molded objects 5, the metal foil 6 is folded and bent in a meandering shape at a portion between the adjacent molded objects 5, and each molded object 5 is stacked via the mirror plate 2. . Both ends of the two long metal foils 6 are electrically connected by lead wires 9 or the like. The loaded material is the lower forming plate 1 on the upper surface of the lower pressing plate 10.
1 is set between the upper molding plate 13 and the lower surface of the upper pressing plate 12. Electrode plates 14 and 15 are provided on the upper surface of the lower molding plate 11 and the lower surface of the upper molding plate 13, respectively. A power supply 16 is connected to the electrode plates 14 and 15. The electrode plate 1 is pressed while pressing between the upper and lower pressing plates 10 and 12.
By energizing the metal foil 6 from the power supply 16 via the metal foils 4 and 15 to generate heat by heating the metal foil 6 with Joule heat,
The molding is performed.

In this device, since the mirror plate 2 is formed of a metal plate, if only the mirror plate 2 is interposed between the adjacent moldings 5, the metal of the adjacent moldings 5 The foil 6 comes into surface contact with the mirror plate 2, and a current flowing through the metal foil 6 is short-circuited at the place where the surface comes into contact, so that the metal foil 6 cannot be heated to a high temperature. For this purpose, a mirror plate 2 is used on both surfaces of an intermediate plate 17 whose surface is insulated, and the intermediate plate 17 is sandwiched between the molded objects 5 and loaded. Using the cooling plate 3 whose surface has been insulated as at least a part of the intermediate plate 17, forming by heating and pressing is performed, and then the laminate obtained by forming the molded object 5 is cooled. So that it cools down.

Here, the heat and pressure molding is performed by using the laminating apparatus shown in FIGS. 5 and 6, and when manufacturing the laminated body, the laminated body is heated at a predetermined temperature while being pressurized at a predetermined pressure. After the molding, the heating is stopped and the cooling is started by flowing the cooling medium through the cooling plate 3, and the cooling is performed until the temperature of the laminate decreases to the glass transition temperature of the cured resin while maintaining the pressure, Thereafter, the pressure is released and the laminate is taken out. FIG. 7 is a graph showing the relationship between pressurization and heating and time at this time, wherein the left vertical axis indicates temperature, the right vertical axis indicates pressure, and the horizontal axis indicates time. Then, for example, after heating and pressing at a pressure of 30 kg / cm ² and a temperature of 200 ° C., cooling is started by passing a cooling medium through the cooling plate 3 until the temperature of the laminate becomes equal to or lower than the glass transition temperature of the cured resin of the laminate. While the pressurization is maintained while cooling, as shown in FIG. 7, the temperature of the cooling plate 3 rapidly decreases immediately after the cooling medium starts flowing, and the temperature of the laminate gradually decreases following the cooling. To go.

[0007]

SUMMARY OF THE INVENTION As described above, the cooling plate 3
Since the temperature rapidly decreases immediately after the start of cooling, the cooling plate 3
The mirror plate 2 which is in contact with the cooling plate 3 is also rapidly cooled, and the cooling plate 3 and the mirror plate 2 contract greatly immediately after the start of cooling. If the coefficient of linear expansion of the cooling plate 3 and that of the mirror plate 2 are significantly different, the contraction dimensions of the cooling plate 3 and the mirror plate 2 are greatly different. However, even after the start of cooling, the pressurization is maintained and the cooling plate 3 and the mirror plate 2 slide with each other. Since the cooling plate 3 and the mirror plate 2 cannot be fitted, there is a possibility that the cooling plate 3 and the mirror plate 2 are deformed due to a difference in dimensional contraction between the cooling plate 3 and the mirror plate 2. The mirror plate 2 is generally made of stainless steel having high rigidity and high surface hardness. The cooling plate 3 is made of aluminum having high thermal conductivity. Expansion coefficient is 11 × 10
^-6 / ° C, the coefficient of linear expansion of aluminum is 23.2 × 10 ^-6
/ ° C, the two have significantly different linear expansion coefficients. Thus, the mirror plate 2 made of stainless steel and the cooling plate 3 made of aluminum
Was used, deformation occurred in each case, and particularly, the aluminum cooling plate 3 having low strength was greatly deformed.

Accordingly, it has been attempted to use the cooling plate 3 made of the same stainless steel as the mirror plate 2, but the stainless steel has a low thermal conductivity, so that the cooling efficiency deteriorates and the cooling efficiency is lowered. There is a problem that the time required for the process is long.

The present invention has been made in view of the above points, and an object of the present invention is to provide a method of manufacturing a laminated body capable of preventing a cooling plate from being deformed without prolonging the time required for cooling. It is the purpose.

[0010]

According to a first aspect of the present invention, there is provided a method of manufacturing a laminated body, wherein a metal foil 6 is laminated on an outer surface of a prepreg 1 in which a required number of laminated prepregs 1 are formed, to form a set of molded articles 5. A plurality of sets of formed bodies 5 are stacked via the stainless steel mirror plate 2 and at least in part are formed via the stainless steel mirror plate 2 on both sides of the aluminum cooling plate 3. After stacking the bodies 5 and forming them by heating and pressurizing, they are cooled by the cooling plate 3 while being pressurized to produce a laminated body from the molded body 5, and then heated and pressurized and then cooled. The cooling by the cooling plate 3 is performed while the pressurization is released and the pressurization is repeated while the cooling by the cooling plate 3 is started, and then the pressurization is maintained again.

According to a second aspect of the present invention, there is provided a method for manufacturing a laminated body, comprising: forming a set of molded bodies 5 by laminating a metal foil 6 on an outer surface of a required number of prepregs 1; 2 and a plurality of sets of the molded objects 5 are stacked via at least a part of the cooling plate 3 made of aluminum and the mirror plates 2 made of stainless steel on both surfaces. After being molded under heat and pressure, it is cooled by the cooling plate 3 while applying pressure to form
In producing a laminated body from the above, after performing heat and pressure molding, the pressure is once released while cooling by the cooling plate 3 is started, and then the cooling is performed by the cooling plate 3 while maintaining the pressure again. It is characterized by the following.

Further, the invention according to claim 3 is characterized in that a cooling plate 3 made of aluminum and a plate 4 made of aluminum is provided on the surface thereof.

[0013]

Embodiments of the present invention will be described below.

FIG. 1 is a graph showing the relationship between pressurizing and heating and time in an embodiment of the first aspect of the present invention. Can be performed in exactly the same manner as described above, and the description thereof will be omitted with reference to the above description.

In the present invention, a mirror plate 2 made of a stainless steel plate is used. The cooling plate 3 is made of aluminum. Although the structure of the cooling plate 3 is not particularly limited, for example, FIG.
The following can be used. In this manifold, a plurality of refrigerant flow paths 21 are opened at both ends, and an aluminum plate 22 is provided at both ends with manifolds 23 mounted thereon. A plurality of refrigerant inflow pipes 24 and refrigerant outflow pipes 25 are alternately provided in each manifold 23. The refrigerant flows from the refrigerant inflow pipe 24 into the refrigerant flow path 21 of the aluminum plate 22 and the refrigerant outflow pipe 2
The aluminum plate 22 of the cooling plate 3 can be cooled by causing the refrigerant to flow out of the cooling plate 5. As the refrigerant, cooled air, water, alcohol, or the like can be used. Further, the aluminum plate 22 is manufactured by joining a plurality of block plates 22a.

In the laminating apparatus shown in FIGS. 5 and 6, at a predetermined pressure P ₁ and a predetermined temperature T ₁ , from t ₀ to t _1.
After the heat and pressure molding is performed for a predetermined period of time, the supply of the refrigerant to the cooling plate 3 is started, and the cooling is started. As shown in FIG. 1, the supply of the refrigerant to the cooling plate 3 causes the temperature of the cooling plate 3 to rapidly decrease immediately after the start of cooling, and the temperature of the laminate to gradually decrease in accordance with the cooling.

According to the first aspect of the present invention, the cooling plate 3
The pressurization is released at the same time as the supply of the refrigerant to the refrigerant is started, and then the pressurization and the release of the pressurization are repeated. When the resin of the prepreg 1 is an epoxy resin, the heating temperature T _{1 at} the time of the heat and pressure molding is used.
Is about 180 to 220 ° C., and the pressure P ₁ is 30 kg /
cm ² , and the release of pressurization and the repetition of pressurization are performed until the temperature of the cooling plate 3 becomes in the range of 70 to 100 ° C. When releasing the pressure, the pressure is 0kg / cm ²
It is not necessary to release until it becomes 5 to 10 kg / cm ²
The pressure may be reduced to the range described above. Pressure is 0 kg / cm ²
It is rather unfavorable to perform the above operation because there is a possibility that misalignment may occur in the stacked bodies stacked in multiple stages. In addition, it is preferable that the pressure release time and the pressurization time per cycle when the pressure release and the pressurization are repeated are each about 1 to 2 minutes. By repeating the release and pressurization of the cooling plate 3 until the temperature of the cooling plate 3 falls to the range of 70 to 100 ° C., the cooling plate 3 is rapidly cooled and the mirror plate 2 in contact with the cooling plate 3 is cooled. Even if the cooling plate 3 is rapidly cooled and the difference between the linear expansion coefficients of aluminum and stainless steel causes a large difference in shrinkage between the cooling plate 3 and the mirror plate 2, the pressure between the cooling plate 3 and the mirror plate 2 is released when the pressurization is released. And the cooling plate 3 and the mirror plate 2 shrink freely with dimensions according to the respective linear expansion coefficients,
The cooling plate 3 and the mirror plate 2 can be prevented from being deformed due to a difference in dimensional shrinkage, and particularly can be effectively prevented from being deformed in the aluminum cooling plate 3 having low strength. It is.

Next, at time t ₂ the temperature of the cooling plate 3 is lowered to a temperature of 70 to 100 ° C., again continuously performing pressure. The pressure for this pressurization is the pressure P _{1 at} the time of hot press molding.
Is the same as The time from t ₁ to initiate the termination to cool the hot pressing up to t _2, i.e. the time to repeat the releasing and pressurizing of the pressure is usually about 5 minutes to 7 minutes. This time point t ₂ is controlled by setting the time from t ₁ or the cooling plate 3
And the temperature of the stacked body near the cooling plate 3 can be detected and controlled for determination. After, after holding the pressure until the time t ₃ when the temperature of the stack is below the glass transition temperature of the cured resin of the laminate, in which to release the pressure and the laminate is removed.

FIG. 2 is a graph showing the relationship between pressurizing and heating and time in an example of the embodiment according to the second aspect of the present invention. Can be performed in exactly the same manner as described above, and the description thereof will be omitted with reference to the above description.

In the laminating apparatus shown in FIGS. 5 and 6, the heat and pressure molding was performed at a predetermined pressure P ₁ and a predetermined temperature T ₁ for a predetermined time from time t ₀ to t ₁ . rear,
The supply of the refrigerant to the cooling plate 3 is started, and the cooling is started. As shown in FIG. 2, the supply of the refrigerant to the cooling plate 3 causes the temperature of the cooling plate 3 to rapidly decrease immediately after the start of cooling, and the temperature of the laminated body to gradually decrease accordingly.

According to the second aspect of the present invention, the cooling plate 3
Simultaneously with the start of the supply of the refrigerant to the cooling plate, the pressurization is released, and the release of the pressurization is continued until the temperature of the cooling plate 3 decreases to a temperature of 70 to 100 ° C. When releasing the pressurization, it is not necessary to release the pressure until the pressure becomes 0 kg / cm ^2.
The pressure may be reduced to a range of 0 kg / cm ² . By releasing the pressurization until the temperature of the cooling plate 3 falls to the range of 70 to 100 ° C., the cooling plate 3 is rapidly cooled, and the mirror plate 2 in contact with the cooling plate 3 is rapidly cooled. Even if the difference in the linear expansion coefficient between the cooling plate 3 and the mirror plate 2 is large due to the difference in the coefficient of linear expansion between the cooling plate 3 and the mirror plate 2, the pressurization is released to release the pressure contact between the cooling plate 3 and the mirror plate 2. It is possible to prevent the cooling plate 3 and the mirror plate 2 from shrinking freely with dimensions corresponding to the respective linear expansion coefficients, and prevent the cooling plate 3 and the mirror plate 2 from being deformed due to a difference in dimensional contraction. A particularly weak aluminum cooling plate 3
Thus, it is possible to effectively prevent the occurrence of deformation.

Next, at time t ₂ the temperature of the cooling plate 3 is lowered to a temperature of 70 to 100 ° C., again continuously performing pressure. The pressure for this pressurization is the pressure P _{1 at} the time of hot press molding.
Is the same as The time from t ₁ to initiate the termination to cool the hot pressing up to t _2, that is, the time for releasing the pressure is usually about 5 minutes to 7 minutes. At this time t ₂ ,
It can be determined by controlling by setting the time from t ₁ or by detecting and controlling the temperature of the cooling plate 3 and the temperature of the laminated body near the cooling plate 3. After, after holding the pressure until the time t ₃ when the temperature of the stack is below the glass transition temperature of the cured resin of the laminate, in which to release the pressure and the laminate is removed.

FIG. 4 shows another embodiment of the cooling plate 3 in which an aluminum plate 22 of the cooling plate 3 is used.
The plate 4 made of the same material, that is, aluminum, is replaceably provided on both surfaces of the plate. The cooling plate 3 having the aluminum plate 4 provided on both surfaces as described above is used, and the cooling plate 3 is formed with the mirror surface plates 2 superposed on both surfaces to perform the molding shown in FIGS. 5 and 6. . By providing the plate 4 on the surface of the cooling plate 3, the plate 4 is interposed between the cooling plate 3 and the mirror plate 2, and the difference in dimensional contraction between the cooling plate 3 and the mirror plate 2 during cooling is reduced. The influence on the cooling plate 3 can be reduced by the plate 4, and the deformation of the cooling plate 3 can be more effectively prevented. In particular, as shown in FIG. 3, the cooling plate 3 is provided with a coolant channel 21 and has a complicated structure, and the aluminum plate 22 of the cooling plate 3 is formed by joining a plurality of block plates 22a. However, by arranging the plate 4 having a plate structure on the surface of the cooling plate 3, the influence of the shrinkage of the mirror surface plate 2 directly affects the cooling plate 3. The action can be prevented by the plate 4, and the deformation of the cooling plate 3 can be effectively prevented. Moreover, since the plate 4 which is in direct contact with the cooling plate 3 is made of the same aluminum as the cooling plate 3, there is no possibility that the cooling plate 3 will be deformed due to a difference in linear expansion coefficient between the two.

[0024]

As described above, according to the method for manufacturing a laminate according to the first aspect of the present invention, a prepreg obtained by laminating a required number of prepregs with a metal foil on the outer surface is formed into a set of molded articles, and A plurality of sets of formed bodies are stacked via the mirror plate, and at least a part of the formed bodies is stacked via a stainless steel mirror plate on both surfaces of an aluminum cooling plate. After heating and pressing, the cooling is performed by a cooling plate while applying pressure to produce a laminated body from the molded object. And pressurization was repeated, and then the cooling by the cooling plate was performed while maintaining the pressurization again, so when the pressurization was released, the crimping between the cooling plate and the mirror surface plate was released and slipped with each other,
The cooling plate made of aluminum and the mirror plate made of stainless steel are freely shrunk according to their respective linear expansion coefficients, and the cooling plate and the mirror plate can be prevented from being deformed due to a difference in dimensional shrinkage. It is possible to effectively prevent deformation of the aluminum cooling plate having low strength. Further, the cooling plate is made of aluminum, has a high thermal conductivity, and has a high cooling efficiency of the heat-pressed laminate, and can shorten the time required for cooling.

According to a second aspect of the present invention, there is provided a method of manufacturing a laminated body, comprising forming a set of molded bodies by laminating a metal foil on an outer surface of a prepreg having a required number of laminated layers, and interposing a mirror plate made of stainless steel. A plurality of sets of moldings are stacked, and at least in part, the moldings are stacked through a stack of stainless steel mirror plates on both sides of an aluminum cooling plate, which is heated and pressed. After that, in order to produce a laminate from a molded body by performing cooling with a cooling plate while applying pressure, after performing heat and pressure molding, once releasing the pressurization while starting cooling with a cooling plate, and then Cooling by the cooling plate is performed while maintaining the pressurization again, so when the pressurization is released, the crimping between the cooling plate and the mirror surface plate is released and they slide with each other, and the aluminum cooling plate and the stainless steel of It can prevent the face plate from shrinking freely according to the respective coefficient of linear expansion, and prevent the cooling plate and mirror plate from being deformed due to the difference in dimensional shrinkage. Can be effectively prevented from occurring. Further, the cooling plate is made of aluminum, has a high thermal conductivity, and has a high cooling efficiency of the heat-pressed laminate, and can shorten the time required for cooling.

According to the third aspect of the present invention, an aluminum cooling plate provided with an aluminum plate on the surface is used, so that the plate is interposed between the cooling plate and the mirror plate. The influence of the difference in dimensional contraction between the cooling plate and the mirror plate upon cooling on the cooling plate during cooling can be reduced by this plate, and the deformation of the cooling plate can be more effectively prevented. In addition, the plate directly in contact with the cooling plate is made of the same aluminum as the cooling plate, and there is no possibility that the cooling plate is deformed due to a difference in linear expansion coefficient between the two.

[Brief description of the drawings]

FIG. 1 is a graph showing the relationship between pressurization and heating and time in an example of the embodiment of the present invention.

FIG. 2 is a graph showing a relationship between pressurization and heating and time in one example of the embodiment of the second invention.

FIG. 3 shows an example of an embodiment of a cooling plate used in claim 1 and claim 2, wherein (a) is a perspective view,
(B) is a sectional view.

FIG. 4 is a front view showing another example of the embodiment of the cooling plate used in claims 1 and 2;

FIG. 5 is a schematic front view showing an example of a lamination molding apparatus.

FIG. 6 is a schematic front view showing another example of the lamination molding apparatus.

FIG. 7 is a graph showing the relationship between pressurization and heating and time in a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Prepreg 2 Mirror surface plate 3 Cooling plate 4 Plate 5 Molded object 6 Metal foil

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) B29L 31:34 (72) Inventor Hiroshi Maeda 1048 Odakadoma, Kadoma City, Osaka Matsushita Electric Works F-term (Reference) 4F100 AB01A AB01C AB33A AB33C BA02 BA03 BA06 BA10A BA10C DH01B GB43 JL00 JL02 4F204 AC03 AD03 AD16 AD19 AD35 AG03 AH36 FA18 FB01 FB11 FF01 FF05 FN11 FN15 FQ08 FQ16 FQ40

Claims (3)

[Claims] 1. A prepreg comprising a required number of prepregs and a metal foil layered on an outer surface of the prepreg to form a set of molded bodies. In step (1), the object to be molded is loaded through a mirror plate made of stainless steel on both sides of a cooling plate made of aluminum, which is heated and pressed, and then cooled by the cooling plate while applying pressure. In manufacturing a laminate from a molded body, after performing heating and pressing molding, release and pressurization are repeated while starting cooling with a cooling plate, and then cooling with a cooling plate while maintaining pressure again A method of manufacturing a laminate. 2. A plurality of prepregs each having a required number of prepregs and a metal foil layered on an outer surface of the prepregs to form a set of formed bodies. In step (1), the object to be molded is loaded through a mirror plate made of stainless steel on both sides of a cooling plate made of aluminum, which is heated and pressed, and then cooled by the cooling plate while applying pressure. When manufacturing a laminated body from a molded product, after applying heat and pressure molding, release the pressurization once while starting cooling with the cooling plate, and then perform cooling with the cooling plate while maintaining the pressure again A method for producing a laminate, characterized in that: 3. The method according to claim 1, wherein a cooling plate made of aluminum is provided with an aluminum plate on a surface thereof.