JP2000006310A - Manufacture of laminated sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent wrinkles from generating when a thin metallic foil is used by curing in a curing oven having a temperature gradient which increases as a base is being conveyed, and pressing by a continuous metal belt having a higher coefficient of linear thermal expansion than that of the metallic foil. SOLUTION: A base 1 wound up in a roll by a material introducing part 9 is continuously fed at a speed of 2 m/min. 100 wt.pts. of vinyl ester resin, a radical polymerization initiator, and 6 wt.pts. of styrene is blended with the base 1 by an impregnating device of an impregnating part, and impregnated with a thermosetting resin varnish at 0.1 atmospheric pressure. A copper foil 3 is laminated on both sides of the impregnated base 1 by catching the copper foil 3 between laminating rolls 14 of a laminating part 11, and cured in a curing oven 5 of a curing part 12. The cured base 1 is pressed from upper and lower directions by metal belts 6 provided in the curing oven 5, and fed to a finishing part 13 for cutting and processing.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a laminated board used for electronic and electrical equipment, and more particularly to a method for manufacturing a laminated board for continuously producing a laminated board.

[0002]

2. Description of the Related Art As a method for manufacturing a laminated board, a manufacturing method for continuously producing a laminate from impregnation to molding has been carried out. FIG.
Shows a conventional method of manufacturing a laminated board, in which a continuous sheet-like base material 1 is impregnated with a thermosetting resin varnish 2 and copper foils 3 are laminated on both sides thereof, and then a curing furnace 5 is formed.
, And the thermosetting resin varnish 2 is cured while applying pressure by a pressure roll to produce a laminate 4. However, since the pressure roll of the curing furnace 5 presses the base material 1 on which the copper foil 3 is laminated by line contact, the pressing area is small, and the iron roll is used because the material is an iron roll. With an expansion coefficient of 8.5 × 10 ^-6 (at 20 ° C.)
The coefficient of linear expansion of the copper foil 3 is considerably smaller than 16.5 × 10 ⁻⁶ (at 20 ° C.), and the copper foil 3 of the obtained laminate 4 is obtained.
In addition, wrinkles and cracks occurred, and the defect rate was high. In particular, in order to meet the demand for a thin laminated plate 4, 3 μm to 1 μm
When 8 μm thin copper foil 3 is used, the tendency is remarkable, and improvement is required.

[0003]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and it is an object of the present invention to provide a method for manufacturing a laminated board in continuous molding, which can prevent wrinkles even when a thin metal foil is used. It is an object of the present invention to provide a method for manufacturing a laminated plate which can obtain a laminated plate having excellent surface smoothness.

[0004]

According to a first aspect of the present invention, there is provided a method for manufacturing a laminate, comprising the steps of:
In the manufacturing method of impregnating the thermosetting resin varnish 2 and laminating the metal foil 3 on the surface thereof, and then curing the thermosetting resin varnish 2 to manufacture a laminated board, in the step of curing the thermosetting resin, The metal foil is cured in a curing furnace 5 having a temperature gradient that increases in temperature as the substrate 1 is conveyed, and is pressed by a continuous metal belt 6 having a larger linear thermal expansion coefficient than the metal foil 3. .

According to a second aspect of the present invention, there is provided a method for manufacturing a laminated board, comprising the steps of:
It is characterized in that a continuous metal belt 6 made of a material having a linear thermal expansion coefficient of 16.5 × 10 ⁻⁶ (at 20 ° C.) or more is used.

According to a third aspect of the present invention, there is provided a method for manufacturing a laminated board, comprising the steps of:
The inner chamber 7 of the curing furnace 5 is divided by a partition plate 8 and is heated.

The present invention relates to an article made from a continuous substrate, for example a textile product such as a woven or nonwoven fabric made of various fibers impregnated with a liquid thermosetting resin varnish, a so-called prepreg. The present invention relates to a laminate obtained by laminating a metal foil, for example, a copper foil or an aluminum foil, on an (impregnated base material).

In this specification, a thermosetting resin varnish is formed from a resin composition containing at least one kind of resin. In addition, it may contain other components such as a solvent, a polymerizable monomer and / or a polymerization initiator.
The resin composition constituting the thermosetting resin varnish is preferably a solution, but may be a dispersion or a suspension unless a particular problem occurs. Specifically, the resin composition in the present specification includes, in addition to the resin composition itself which is a liquid, a composition and a solid obtained by further dissolving such a liquid resin composition in a solvent. A composition selected by dissolving a certain resin composition in a solvent is also included.

As the thermosetting resin, resins such as epoxy resin, phenol resin, polyester resin, melamine resin, polyimide resin, vinyl ester resin and polybutadiene resin can be used.

Examples of the continuous substrate include natural fibers such as paper and cotton, organic synthetic fibers such as polyamide, polyvinyl alcohol, polyester and polyacryl, and woven and nonwoven fabrics such as glass and asbestos.

The metal foil is not particularly limited as long as it can be used for a laminate, but copper foil, aluminum foil and the like are preferably used.
8 μm metal foil is suitable.

Further, the continuous metal belt is made of a metal material having a coefficient of linear thermal expansion of 16.5 × 10 ⁻⁶ (at 20 ° C.) such as copper, bronze, brass, aluminum, and duralumin having a thickness of 2 to 3 mm. What has been formed can be used.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, a method for manufacturing a laminate according to the present invention will be specifically described.

FIG. 1 schematically shows an example of a manufacturing apparatus for carrying out the manufacturing method of the present invention. The illustrated manufacturing apparatus includes a material input section 9 for feeding out a continuous base material 1, an impregnation section 10 for impregnating the base material 1 with a thermosetting resin varnish 2, and a base material 1 impregnated with a thermosetting resin varnish 2. It comprises a laminating section 11 for laminating the metal foil 3, a hardening section 12 for hardening the laminated base material 1, and a finishing section 13 for cutting.

In the material charging section 9, the substrate 1 wound into a roll is formed. In the embodiment of the present invention, the thickness is 0.1 mm and the width is 10 mm.
00mm glass cloth (“2
116 ", style 2116 type defined in ASTM standard D578), and the paper was continuously fed at a feed speed of 2 m / min. The supplied glass cloth was subjected to 100 parts by weight of a vinyl ester resin (“S510” manufactured by Showa Polymer Co., Ltd.) and 1 part by weight of a radical polymerization initiator (“Perbutyl O” manufactured by NOF Corporation) by the impregnating device of the impregnating section 10. And 6 parts by weight of styrene, and impregnated with a thermosetting resin varnish 2 formed by defoaming under reduced pressure at 0.1 atm for 30 minutes or more.

Furthermore, a copper foil 3 having a thickness of 9 μm (“J” manufactured by Nikko Gould Foil Co., Ltd.)
ST09μ ”was sandwiched between the laminating rolls 14 of the laminating section 11 for lamination, and was cured by the curing furnace 5 of the curing section 12. The metal belt 6 pressurized in the curing furnace 5 is arranged so as to press the substrate 1 conveyed through the curing furnace 5 endlessly from above and below. The temperature rises as it is conveyed from the inlet 15 to the outlet 16 and is cooled when returning to the inlet 15 side.

That is, the metal belt 6 expands as the temperature rises in the curing furnace 5, and contracts when cooled. If the expansion of the metal belt 6 at the time of temperature rise is larger than the linear thermal expansion coefficient of the metal foil 3, the expansion of the metal foil 3 is promoted to suppress the generation of wrinkles. The inner chamber 7 of the curing furnace 5 is divided by a partition plate 8 to form a heating chamber 17 corresponding to the heating temperature. The temperature gradient is clarified by the partition plate 8, so that the conveyed metal foil 3 can be expanded in the lateral direction and wrinkles generated on the end face can be suppressed.

The linear thermal expansion coefficient of the copper foil 3 is 16.5 × 10
⁻⁶ (at 20 ° C.), so that a metal belt 6 using a metal material having a linear thermal expansion coefficient higher than that was used.

[0019] The pressure may vary depending on the thickness of the obtained laminated board 4 preferably ^{0.8kg / cm 2 ~2.0kg / cm 2} .
In the example of the present invention, a laminate 4 was obtained by applying a pressure of 1.0 kg / cm ² .

Hereinafter, Examples and Comparative Examples will be described.

[0021]

(Example 1) As the substrate 1, a thickness of 0.1 m was used.
m, and a glass cloth (“2116” manufactured by Asahi Schebel Co., Ltd., style 2116 type specified in ASTM D578) having a width of 1000 mm was continuously conveyed at a feed speed of 2 m / min.

The impregnating resin is a mixture of 100 parts by weight of a vinyl ester resin (“S510” manufactured by Showa Kogyo Co., Ltd.), 1 part by weight of a radical polymerization initiator (“Perbutyl O” manufactured by NOF Corporation, and 6 parts by weight of styrene). Then, a thermosetting resin varnish 2 formed by defoaming under reduced pressure at 0.1 atm for 30 minutes or more was impregnated.

The copper foil 3 has a thickness of 9 μm on both sides of the continuous substrate 1.
(“JST09μ” manufactured by Nikko Gould Foil Co., Ltd. was sandwiched between the laminating rolls 14 of the laminating section 11 for lamination.

Further, the coefficient of linear thermal expansion is 17 × 10 ⁻⁶ (20
Using a metal belt 6 made of a copper alloy (at ° C), the temperature was raised without providing the partition plate 8, and a pressure of 1.0 kg / cm ² was applied to obtain a laminated plate 4.

The heating temperature of the curing furnace 5 is such that the inner chamber 7 is divided into five heating chambers 17 having a length of about 8 m, and the room 15 is heated to room temperature, 100 ° C., 140 ° C., 170 ° C., and 200 ° C. from the inlet 15. Heated. (Example 2) A linear thermal expansion coefficient of 17
Using a metal belt 6 of a copper alloy of × 10 ^-6 (at 20 ° C.), a partition plate 8 was provided in an inner chamber 7 of a curing furnace 5, and the temperature was raised to obtain a laminated plate 4. (Embodiment 3) Linear thermal expansion coefficient 23
Using a metal belt 6 of a copper alloy of × 10 ^-6 (at 20 ° C.), the temperature was raised without providing a partition plate 8 to obtain a laminated plate 4. (Example 4) A coefficient of linear thermal expansion of 23
Using a metal belt 6 of a copper alloy of × 10 ^-6 (at 20 ° C.), a partition plate 8 was provided in an inner chamber 7 of a curing furnace 5, and the temperature was raised to obtain a laminated plate 4. (Comparative Example 1) A laminated plate as shown in Example 1 above, except that the pressurization in the curing furnace 5 was performed by using a pressure roll without using the metal belt 6 as in the manufacturing apparatus shown in FIG. 4
I got

[0026]

[Evaluation] After curing, the obtained laminate was cut into a sheet shape by cutting to a size of 1 m, and the occurrence of wrinkles was confirmed silently. Table 1 shows the results.

[0027]

As shown in Table 1, according to the method for producing a laminate of the present invention, generation of wrinkles on a continuous base material was suppressed, and a defective rate was able to be reduced.

[0028]

As described above, the laminate of the present invention
The production method uses a thermosetting resin on a continuous sheet-like substrate.
The varnish was impregnated and a metal foil was laminated on the surface.
First, a thermosetting resin varnish is cured to produce a laminate.
In the manufacturing method, a step of curing the thermosetting resin
The temperature gradient at which the substrate is heated as it is conveyed
Cured in a curing oven with
Pressing with a continuous metal belt with a large coefficient of linear thermal expansion
Therefore, from the linear thermal expansion coefficient of the metal foil that expands due to heating
Since the metal belt has a high coefficient of linear thermal expansion, it
Wrinkles can be lengthened, and the defect rate can be reduced.
You. Further, the coefficient of linear thermal expansion is 16.5 × 10 ^-6(At 20 ° C
By forming a metal belt with the above materials
The coefficient of linear thermal expansion of metal foil used for laminates
Metal belt can be used.
Wrinkles can be lengthened and the defective rate can be reduced.

Further, since the inner chamber of the curing furnace is divided by the partition plate and heated, the temperature gradient of the heated chamber becomes clear,
The behavior of the metal due to thermal expansion remarkably appears, which promotes the expansion of the metal foil in the lateral direction, suppresses the generation of wrinkles, and reduces the defective rate.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of a manufacturing apparatus showing an embodiment of the present invention.

FIG. 2 is a schematic configuration diagram showing a manufacturing apparatus in a conventional method for manufacturing a laminated board.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Base material 2 Resin varnish 3 Metal foil 4 Laminated plate 5 Curing furnace 6 Metal belt 7 Inner room 8 Partition plate

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Miku Sugawa 1048 Kazuma Kadoma, Kadoma City, Osaka Prefecture Inside Matsushita Electric Works Co., Ltd. F-term (reference) 4F100 AB17 AB33D AB33E AG00 AK01A AK01B AK01C AK12 AK21 AL05 AT00A BA05 BA06 BA10D BA10E BA13 CA02 DG11 EH012 EJ082 EJ182 EJ422 EJ821 EJ961 GB43 JA02 JB13A JB13B JB13K

Claims (3)

[Claims] 1. A manufacturing method for manufacturing a laminated board by impregnating a continuous sheet-like base material with a thermosetting resin varnish, laminating a metal foil on the surface thereof, and then curing the thermosetting resin varnish. In the step of curing the thermosetting resin, while being cured in a curing furnace having a temperature gradient that is increased in temperature as the substrate is transported, by a continuous metal belt having a larger linear thermal expansion coefficient than the metal foil A method for producing a laminate, comprising applying pressure. 2. The method for manufacturing a laminate according to claim 1, wherein a continuous metal belt made of a material having a linear thermal expansion coefficient of 16.5 × 10 ⁻⁶ (at 20 ° C.) or more is used. Manufacturing method of the laminated board to be. 3. The method for producing a laminate according to claim 1, wherein the inner chamber of the curing furnace is divided by a partition plate and heated.