JP2002248621A - Prepreg manufacturing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a prepreg manufacturing method capable of realizing accurate adjustment when a thermoseting resin composition containing no dilution solvent is applied in a molten state while continuously sending a glass base material. SOLUTION: The thermoseting resin composition 6 is supplied to a transfer roll 4 in a molten state while the glass base material 2 is continuously sent to a backup roll 3 and transferred to the single surface of the glass base material 2 from the transfer roll 4 to coat and impregnate the glass base material and the coated and impregnated glass base material 2 is heated to semi-cure the thermosetting resin composition 6. The resin content of the prepreg 1 is measured by an inspection device 7 and the difference between the measured value and preset resin content is operated by a discrimination machine 8 and, corresponding to this operated data, the presence of the control of the interval between the transfer roll 4 and the backup roll 3, the presence of the control of the interval between the transfer roll 4 and a metering roll 5 spreading the thermosetting resin composition 6 over the outer peripheral surface of the transfer roll 4 and the presence of the control of the rotational speed of the transfer roll 4 are discriminated and respective controls are performed on the basis of the discrimination result.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of applying a thermosetting resin composition containing no diluting solvent in a molten state while continuously feeding a glass substrate, impregnating the same, and then heating and thermosetting. The present invention relates to a method for producing a prepreg for semi-curing a conductive resin composition.

[0002]

2. Description of the Related Art A prepreg used for producing a substrate of a printed wiring board is prepared by, for example, diluting a thermosetting resin composition containing an epoxy resin or the like with a glass base material with a solvent and adjusting the specific gravity. A glass substrate is impregnated with the adjusted thermosetting resin composition, and the impregnated glass substrate is heated by a drier to semi-cure the resin in the resin composition to produce the resin composition.
The solvent is removed from the system by drying the glass substrate impregnated with the adjusted thermosetting resin composition. With the recent increase in environmental problems and the demand for production efficiency, it has been proposed to use the thermosetting resin composition without solvent without diluting with a solvent.

[0003]

As the above-mentioned manufacturing method,
For example, in Japanese Patent Application Laid-Open No. 2000-219754, while a glass substrate is continuously fed to a backup roll, the thermosetting resin composition is supplied in a molten state to a transfer roll disposed opposite to the backup roll. And
A method is known in which a thermosetting resin composition is transferred from a transfer roll to one surface of the glass base material, coated, and impregnated with the thermosetting resin composition, and then heated to semi-harden the thermosetting resin composition. Have been. In the above manufacturing method, since the thermosetting resin composition is used in a state of high viscosity of about 400 cps, there is a possibility that the resin content of the prepreg may fluctuate by a slight variation. For example, when the interval between various rolls is changed by switching of a thermosetting resin composition, switching of a glass substrate wound in a roll shape, and the like, the resin content of the prepreg before and after the change is easily changed. . Therefore, when applying the thermosetting resin composition to the glass substrate,
Accurate adjustment is required.

The present invention has been made in view of the above circumstances, and an object of the present invention is to apply a thermosetting resin composition containing no diluting solvent in a molten state while continuously feeding a glass substrate. It is an object of the present invention to provide a method for manufacturing a prepreg that can realize accurate adjustment when working.

[0005]

Means for Solving the Problems The inventors of the present invention have conducted intensive studies in order to achieve the above object, and as a result, in order to adjust the fluctuation of the resin content of the prepreg, it is necessary to control the rotation speed of the transfer roll, Controlling the distance between the transfer roll and the metalling roll that spreads the thermosetting resin composition on the outer peripheral surface of the transfer roll,
It was found that control of the interval between the transfer roll and the backup roll was important, and as a result of repeated studies, the difference between the resin content of the prepreg and the resin content set in advance was determined. When the absolute value is equal to or less than a predetermined value, the rotation speed of the transfer roll is controlled. When the absolute value of the difference between the resin contents exceeds the predetermined value and is within twice the predetermined value, the transfer roll and the transfer roll are controlled. Control of the spacing of the metering rolls for supplying the thermosetting resin composition, and control of the rotation speed of the transfer roll, and the absolute value of the difference in resin content exceeds twice the predetermined value. In the case, the control of the interval between the transfer roll and the backup roll, and the control of the interval between the transfer roll metalling rolls, and the control of the rotation speed of the transfer roll, it has been found that accurate adjustment can be performed.
The present invention has been completed.

A method for producing a prepreg according to claim 1 is
While continuously feeding the glass substrate to the backup roll, a thermosetting resin composition containing no diluent solvent is supplied in a molten state to a transfer roll disposed opposite to the backup roll, and the glass Transferring to one side of the substrate and coating, after impregnating the glass substrate with the thermosetting resin composition, the method for producing a prepreg in which the thermosetting resin composition is semi-cured by heating, The resin content is measured by an inspection device, and the difference between the measured value and a preset resin content is calculated by a discriminator. According to the calculated data, the control of the interval between the transfer roll and the backup roll is performed. Determining whether or not to control the distance between the transfer roll and the metalling roll that spreads the thermosetting resin composition on the outer peripheral surface of the transfer roll, and whether or not to control the rotation speed of the transfer roll. And performing the control based on the result.

According to a second aspect of the present invention, there is provided a method of manufacturing a prepreg.
2. The method for producing a prepreg according to claim 1, wherein the rotation speed of the transfer roll is controlled when the absolute value of the difference between the resin content of the prepreg and the set resin content is equal to or less than a predetermined value. And

[0008] The method for producing a prepreg according to claim 3 is characterized in that:
In the method for producing a prepreg according to claim 1 or claim 2, when the absolute value of the difference between the resin content of the prepreg and the set resin content is greater than a predetermined value and not more than twice the predetermined value, The distance between the transfer roll and the metalling roll that supplies the thermosetting resin composition to the transfer roll is controlled.

The method for producing a prepreg according to claim 4 is
4. The method for producing a prepreg according to claim 1, wherein the absolute value of the difference between the resin content of the prepreg and the set resin content exceeds two times a predetermined value. It is characterized in that the interval between the roll and the backup roll is controlled.

[0010] The method for producing a prepreg according to claim 5 is characterized in that:
5. The method for producing a prepreg according to claim 1, wherein a rotation speed of the transfer roll is 0.1 m / m.
The resin content of the prepreg that fluctuates in units of in is obtained in advance, and the rotation speed of the transfer roll is controlled based on the fluctuation amount.

[0011] The method for producing a prepreg according to claim 6 comprises:
6. The method for producing a prepreg according to claim 1, wherein a resin content of the prepreg in which an interval between the transfer roll and the metalling roll fluctuates in units of 1 μm is determined in advance, and the transfer roll is determined based on the fluctuation. And controlling the interval between the metalling rolls.

[0012] The method for producing a prepreg according to claim 7 comprises:
7. The method for producing a prepreg according to claim 1, wherein the resin content of the prepreg in which the interval between the transfer roll and the backup roll fluctuates in units of 1 μm is determined in advance, and the transfer roll and the backup are determined based on the variation. It is characterized in that the roll interval is controlled.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described with reference to the drawings. FIG. 1 is a schematic diagram of a manufacturing apparatus showing an example of an embodiment corresponding to the present invention.

The prepreg 1 to which the present invention is applied is supplied with a thermosetting resin composition 6 containing no diluting solvent in a molten state, continuously coated, and impregnated with the glass substrate 2. Thereafter, the thermosetting resin composition 6 is semi-cured by heating to produce the thermosetting resin composition 6.

The glass substrate 2 includes a glass woven fabric, a glass mat, a glass paper, and the like, and a long material wound in a roll shape can be used. The arrow shown on the glass substrate 2 in FIG. 1 indicates the direction in which the glass substrate 2 is fed.

A manufacturing apparatus for manufacturing the prepreg 1 includes:
The glass substrate 2 is turned around the outer periphery of the backup roll 3 so as to be folded back, and a transfer roll 4 is arranged so as to face the backup roll 3 via the glass substrate 2. The transfer roll 4 is driven to rotate in the direction opposite to the feeding direction of the glass substrate 2 (the direction of movement of the facing surface between the glass substrate 2 and the transfer roll 4 is opposite). In addition, the above-described manufacturing apparatus includes a metal ring that is rotationally driven on the outer circumference of the transfer roll 4 in a rotation direction and a reverse direction of the transfer roll 4 (the moving direction of the opposing surfaces of the transfer roll 4 and the metalling roll 5 is opposite). Roll 5 is arranged. In addition, the manufacturing apparatus is configured such that the glass substrate 2
The turning roll 11 is arranged at a position on the side of the traveling direction. The turning roll 11 is driven to rotate in a direction opposite to the feeding direction of the glass base material 2 (the moving direction of the opposing surfaces of the glass base material 2 and the turning roll 11 is opposite direction).
Further, in the manufacturing apparatus, the heating device 9 is disposed at a position on the side of the glass substrate 2 in the traveling direction from the position at which the rotating roll 11 is disposed. The heating device 9 is formed, for example, as a device capable of circulating heated air inside and heating the device in a non-contact manner. The manufacturing device is located at a position on the side of the glass substrate 2 in the traveling direction from the position of the heating device 9,
An inspection device 7 is arranged. The inspection device 7 can inspect the resin content and the like of the prepreg 1 by, for example, a method using a β-ray weight meter.

Examples of the thermosetting resin composition 6 include a solventless epoxy resin. The manufacturing apparatus includes a tank 20a for storing a composition (main component) mainly composed of a thermosetting resin and a tank 20b for storing a composition mainly composed of a curing agent, each of which is formed by a gear pump or the like. A resin feeder 22 for feeding and mixing a predetermined amount of each composition by the measuring pumps 21a and 21b is provided. The solventless thermosetting resin composition 6 prepared by mixing the respective compositions in this manner is supplied to the transfer roll 4 in a molten state. When the thermosetting resin composition 6 in a molten state is supplied to the outer peripheral surface of the transfer roll 4, the thermosetting resin composition 6 is uniformly spread on the outer peripheral surface of the transfer roll 4 by the metalling roll 5.

In the above-described manufacturing apparatus, the distance between the transfer roller 4 and the transfer roller 4 can be increased or decreased by operating the metering roll 5. The manufacturing apparatus increases the amount of the thermosetting resin composition 6 brought in for the transfer roll 4 to apply to the glass substrate 2 by increasing the distance between the metalling roll 5 and the transfer roll 4, , Metering roll 5
By closing the gap between the thermosetting resin composition 6 and the transfer roll 4, the amount of the thermosetting resin composition 6 brought in for coating can be reduced. Further, the manufacturing apparatus can change the rotation speed of the transfer roll 4. The manufacturing apparatus increases the amount of the thermosetting resin composition 6 that the transfer roll 4 brings in to coat the glass substrate 2 by accelerating the transfer roll 4 and increasing the number of rotations. By reducing the number of rotations by reducing the speed of the roll 4, the amount of the thermosetting resin composition 6 brought in for coating can be reduced.

In the manufacturing method using the above manufacturing apparatus, one side of the glass substrate 2 is pressed by the backup roll 3, and the thermosetting resin composition 6 is transferred from the transfer roll 4 to the surface of the one side of the glass substrate 2. Transferred to a uniform coating. Since the thermosetting resin composition 6 applied to one surface of the glass substrate 2 is in a molten state, it penetrates and impregnates the inside of the glass substrate 2 naturally. The manufacturing apparatus can operate the backup roll 3 to increase or decrease the interval with the transfer roll 4. The above manufacturing apparatus closes the space between the backup roll 3 and the transfer roll 4 to increase the amount of the thermosetting resin composition 6 applied to the glass substrate 2.
The gap between the glass substrate 2 and the transfer roll 4 is increased.
It is possible to reduce the amount of the thermosetting resin composition 6 to be applied to the substrate.

In the above-mentioned production method, the glass substrate 2 coated and impregnated with the thermosetting resin composition 6 in the molten state is continuously fed to the position of the rotating roll 11. Rolling roll 11
Are arranged so as to be pressed against the surface of the glass substrate 2 on which the thermosetting resin composition 6 is applied. When the glass base material 2 comes into contact with the outer circumference of the surrounding roll 11 and passes, the molten thermosetting resin composition 6 applied and impregnated on the glass base material 2 is pressed against the surrounding roll 11. As a result, the glass substrate 2 is extruded and turned around on the surface opposite to the coated surface. The above-mentioned manufacturing method is to apply the thermosetting resin composition 6 in a molten state to one surface of the glass substrate 2 with the transfer roll 4, and to uniformly apply the thermosetting resin composition 6 to both surfaces of the glass substrate 2. It can be impregnated.

The above-mentioned production method comprises the steps of preparing a thermosetting resin composition 6
The glass substrate 2 coated and impregnated is sent to a heating device 9,
The prepreg 1 can be obtained by heating and semi-curing the thermosetting resin composition to a B-stage state.

In the above manufacturing method, the resin content is automatically measured by the inspection device 7 while the prepreg 1 is transported. In the manufacturing method, the difference between the measured value measured by the inspection device 7 and the preset resin content is calculated by the discriminator 8, and according to the calculated data, the transfer roll 4, the backup roll 3, The purpose is to automatically control the metalling roll 5 and adjust the resin content of the prepreg 1. What is controlled is the transfer roll 4 and the backup roll 3
, The interval between the transfer roll 4 and the metering roll 5, and the rotation speed of the transfer roll 4.

A method for adjusting the resin content of the prepreg 1 will be described with reference to the flowcharts of FIGS. The resin content is, for example, unit m of prepreg 1
^{It is} expressed in weight per ² (g / m ² ). The preset resin content is appropriately set according to the amount of resin required when the prepreg 1 is used in the next step. The resin content set as described above is represented by a median and an allowable range of +-as the indication. In the above manufacturing method, the set resin content (a ₀ ) and the allowable range (k) are input to the discriminator 8 as a predetermined value for discrimination.

In the above manufacturing method, as shown in FIG. 2, the manufacturing apparatus is operated to start coating, and the resin content of the prepared prepreg 1 is measured. Next, the manufacturing method calculates a difference (a ₁ −a ₀ = a) from the measured resin content (a ₁ ) and the set resin content (a ₀ ), and calculates the set resin content. If not equal to the quantity (a ₀ ), the difference (a) obtained by the calculation is compared with the predetermined value (k) for the above determination, and the process proceeds to each step according to the compared state.

In the above manufacturing method, control is performed in step 1 when the absolute value of the difference (a) obtained by the calculation is equal to or smaller than a predetermined value (k). If the absolute value of the difference (a) obtained by the calculation is small, the resin content is adjusted by changing the rotation speed of the transfer roll 4. How to the adjustment, first difference obtained by the calculation (a) GaTadashika (a ₁ is greater than a _0), or negative or (a ₁ is a ₀ less) to determine. If the difference (a) obtained by the calculation is positive, an instruction signal is transmitted from the discriminator 8, and the transfer roll 4 is decelerated to reduce the rotation speed. As a result, the amount of the thermosetting resin composition 6 that the transfer roll 4 brings in to coat the glass substrate 2 is:
As a result, the resin content of the prepreg 1 decreases. On the other hand, if the difference (a) obtained by the calculation is negative, an instruction signal is transmitted from the discriminator 8 to accelerate the transfer roll 4 to increase the rotation speed. As a result, the amount of the thermosetting resin composition 6 that the transfer roll 4 brings in to coat the glass substrate 2 increases, and the resin content of the prepreg 1 increases.

The degree to which the rotation speed of the transfer roll 4 is varied is such that the rotation speed of the transfer roll 4 is 0.1 m / min.
The resin content (R) of the prepreg 1 that fluctuates in units is determined in advance, and the rotation speed of the transfer roll 4 is adjusted based on the fluctuation amount. The rotation speed of the transfer roll 4 may be corrected by an amount determined by the following (1).

Correction value of rotation speed of transfer roll (m / min) = a (g / m ² ) ÷ R (g / m ² ) × 0.1 (m / min) (1) Is that the absolute value of the difference (a) obtained by the calculation in step 2 exceeds the predetermined value (k) and the predetermined value (k)
The control is performed when the value is twice or less. In such a case,
The resin content is adjusted by changing the distance between the transfer roll 4 and the metering roll 5. How to the adjustment, first difference obtained by the calculation (a) GaTadashika (a ₁ is greater than a _0), or negative or (a ₁ is a ₀ less) to determine. If the difference (a) obtained by the calculation is positive, an instruction signal is transmitted from the discriminator 8 to activate the metalling roll 5 to close the gap between the transfer roll 4 and the metalling roll 5. As a result, the amount of the thermosetting resin composition 6 carried by the transfer roll 4 for coating the glass substrate 2 decreases, and the resin content of the prepreg 1 decreases. On the other hand, when the difference (a) obtained by the calculation is negative, an instruction signal is transmitted from the discriminator 8 to operate the metalling roll 5 to increase the interval between the transfer roll 4 and the metalling roll 5. As a result, the amount of the thermosetting resin composition 6 that the transfer roll 4 brings in to coat the glass substrate 2 increases, and the resin content of the prepreg 1 increases.

The extent to which the distance between the transfer roll 4 and the metalling roll 5 is varied is such that the distance between the transfer roll 4 and the metalling roll 5 varies in units of 1 μm.
The resin content (S) is determined in advance, and the interval between the transfer roll 4 and the metering roll 5 is adjusted based on the variation. At that time, it is desirable to adjust the rotation speed in combination with the above-described correction of the rotation speed of the transfer roll because the accuracy is further improved. That is, a resin content (a ₂ ) for correcting about 補正 to ５ of the predetermined value (k) by the rotation speed of the transfer roll is set in advance, and this resin content (a ₂ ) is And the remaining resin content (a-a ₂ ) is controlled by the distance between the transfer roll 4 and the metering roll 5. The distance between the transfer roll 4 and the metering roll 5 may be corrected by an amount determined by the following (2). Further, the rotation speed of the transfer roll 4 may be corrected by an amount obtained by the following (3).

Correction value (μm) of the interval between the transfer roll 4 and the metering roll 5 = ｛a (g / m ^Two ) -A_Two(G / m^Two )｝ ÷ S (g / m^Two ) × 1 (μm) (2) A correction value of the rotation speed of the transfer roll (m / min) = a_Two (G / m^Two ) ÷ R (g / m^Two ) × 0.1 (m / min) (3) In the above manufacturing method, in step 3, the calculation was performed.
When the absolute value of the difference (a) exceeds twice the predetermined value, the control is performed.
Done. The absolute value of the difference (a) obtained by the operation in this way
Is large, the backup roll 3 and the transfer roll 4
The resin content is adjusted by varying the distance between the two. Above tone
First, the difference (a) obtained by the operation is positive (a
₁Is a₀Greater than) or negative (a₁Is a₀Less than
) Is determined. The difference (a) obtained by the operation is positive
And an instruction signal is transmitted from the discriminator 8 to perform backup.
Activate Roll 3 and make backup roll 3 and transfer roll
Leave an interval with the file 4. As a result, the thermosetting resin composition
6, only the surface layer is pressed against the glass substrate 2
Thus, the amount of the thermosetting resin composition 6 to be applied is reduced.
Thus, the resin content of the prepreg 1 decreases. On the other hand, the operation
If the difference (a) obtained in step (1) is negative,
Is transmitted and the backup roll 3 is activated to
The gap between the backup roll 3 and the transfer roll 4 is closed.
As a result, the innermost layer of the thermosetting resin composition 6 was loosened.
Thermoset resin set that is pressed against the base material 2
The amount of the product 6 increases, and the resin content of the prepreg 1 increases.
To increase.

The backup roll 3 and the transfer roll 4
The resin content (T) of the prepreg 1 in which the distance between the backup roll 3 and the transfer roll 4 fluctuates in units of 1 μm is determined in advance, and the backup roll 3 is determined based on the fluctuation amount. The distance between the transfer roll 3 and the transfer roll 4 is adjusted. At this time, it is desirable to adjust the distance between the transfer roll 4 and the metalling roll 5 and the rotation speed of the transfer roll in combination with the above-described correction because the accuracy is further improved. That is, the predetermined value (k) of 1.1 to 2..
A resin content (a ₃ ) for correcting about 0 by the interval between the transfer roll 4 and the metalling roll 5 is set, and about 1/2 to 1/5 of the predetermined value (k) is determined by the rotation speed of the transfer roll. The resin content (a ₂ ) to be corrected is set. The resin content (a ₂ ) is controlled by the rotation speed of the transfer roll, and the resin content (a ₃ -a ₂ ) is controlled by the distance between the transfer roll 4 and the metering roll 5, and the remaining resin content (a a-a ₃ ) is controlled by the interval between the backup roll 3 and the transfer roll 4. The interval between the backup roll 3 and the transfer roll 4 is
The correction may be made by the amount obtained by the following (4).
The distance between the transfer roll 4 and the metering roll 5 is corrected by the amount obtained by the following (5),
It is preferable to correct the amount of rotation obtained by the following (6).

A correction value (μm) of the interval between the backup roll 3 and the transfer roll 4 = {a (g / m ² ) −a ₃ (g / m ² )} T (g / m ² ) × 1 (μm) ) (4) and transfer roll 4 and the correction value of the spacing of the metering roll _{5 (μm) = {a 3} (g / m 2) -a 2 (g / m 2)} ÷ S (g / m 2) × 1 (μm) (5) Correction value of rotation speed of transfer roll (m / min) = a ₂ (g / m ² ) ÷ R (g / m ² ) × 0.1 (m / min) (6) The above-mentioned manufacturing method comprises the steps of: calculating the difference (a) between the measured value (a ₁ ) of the resin content of the prepreg 1 and a predetermined resin content (a ₀ );
When the absolute value of the difference (a) in the resin content is equal to or less than a predetermined value, the rotation speed of the transfer roll 4 is controlled, and the absolute value of the difference (a) in the resin content is changed to a predetermined value. Transfer roll 4 and metering roll 5
And the rotation speed of the transfer roll 4 is controlled. When the absolute value of the difference (a) in the resin content exceeds twice the predetermined value, the transfer roll 4 and the backup roll 3 are controlled. , The distance between the transfer roll 4 and the metalling roll 5, and the control of the rotation speed of the transfer roll 4, accurate adjustment can be performed.

[0032]

EXAMPLES A specific method of the present invention will be described. The glass substrate is a 0.18 mm thick glass woven cloth (manufactured by Asahi Schwebel Co., Ltd., product number 7628), and the thermosetting resin composition is prepared by mixing a curing agent with a solventless epoxy resin at a temperature of 95 ° C.
And a viscosity of 400 cps was used. In advance, the variation of the resin content of the prepreg with respect to the variation of the rotation speed of the transfer roll is determined in a graph (FIG. 6) by a trial test, and the resin content of the prepreg that varies at a unit of 0.1 m / min of the rotation speed of the transfer roll ( R) is set to 0.678 g / m ² . Further, the change in the resin content of the prepreg with respect to the change in the distance between the transfer roll and the metalling roll was determined by a graph (FIG. 7).
The resin content (S) of the prepreg, which fluctuates in μm units, is set to 1.38 g / m ² . Further, the variation of the resin content of the prepreg with respect to the variation of the interval between the backup roll and the transfer roll is determined by a graph (FIG. 8), and the resin content (T) of the prepreg where the interval between the backup roll and the transfer roll varies by 1 μm unit. ) Is set to 1.827 g / m ² .

Example 1 Resin content (a ₀ ) was 363
g / m ² . The predetermined value (k) for discrimination is 8
g / m ² .

The glass substrate is continuously fed to a backup roll at a speed of 17.6 m / min. Coating was performed at a transfer roll rotation speed of 17.45 m / min, a metalling roll rotation speed of 4.05 m / min, a transfer roll-metalling roll spacing of 240 μm, and a backup roll-transfer roll spacing of 290 μm. Sometimes, the measured value (a ₁ ) of the resin content of the prepreg is 357.9 g / m ²
Met. The difference (a) obtained by the calculation is -5.1 g / m ²
The absolute value was equal to or less than the predetermined value (k).

At this time, the degree to which the rotation speed of the transfer roll 4 is varied is 0.75 m / m obtained by the following equation.
Correct to in. An instruction signal is transmitted from the discriminator to correct the rotational speed of the transfer roll by 0.75 m / min. A correction value (m / min) of the rotation speed of the transfer roll = 5.
1 (g / m ² ) ÷ 0.678 (g / m ² ) × 0.1 (m
/Min)=0.75 In this way, by accelerating the transfer roll 4, the resin content of the prepreg could be made 363 g / m ² .

Example 2 Resin content (a ₀ ) was 363
g / m ² . The predetermined value (k) for discrimination is 8
g / m ² .

The glass substrate is continuously fed to a backup roll at a speed of 18.79 m / min. The rotation speed of the transfer roll was 18.11 m / min, the rotation speed of the metalling roll was 3.88 m / min, the interval between the transfer roll and the metalling roll was 270 μm, and the interval between the backup roll and the transfer roll was 320 μm. Sometimes, the measured value (a ₁ ) of the resin content of the prepreg is 372.8 g / m ²
Met. The difference (a) obtained by the operation is +9.8 g / m ²
In this case, the absolute value exceeded the predetermined value (k) and was twice or less. At this time, the resin content (a ₂ ) corrected by the rotation speed of the transfer roll is 2.0 g / m ² , and the remaining resin content (a−a ₂ ) is controlled by the distance between the transfer roll and the metering roll. I do.

The distance between the transfer roll and the metering roll is corrected to 5.07 μm obtained by the following equation. Further, the rotation speed of the transfer roll is corrected to 0.29 m / min obtained by the following equation. That is, an instruction signal is transmitted from the discriminator, the interval between the transfer roll and the metering roll is closed by 5.65 μm, and the rotation speed of the transfer roll is corrected to be reduced by 0.29 m / min. Correction value (μm) of the interval between the transfer roll 4 and the metering roll 5 = ｛9.8 (g / m ² ) −2.0 (g / m)
² )｝ ÷ 1.38 (g / m ² ) × 1 (μm) = 5.65 Correction value (m / min) of rotation speed of transfer roll = 2.
0 (g / m ² ) ÷ 0.678 (g / m ² ) × 0.1 (m
/Min)=0.29 In this way, by accelerating the transfer roll 4, the resin content of the prepreg could be made 363 g / m ² .

Example 3 Resin content (a ₀ ) was 363
g / m ² . The predetermined value (k) for discrimination is 8
g / m ² .

The speed of the glass substrate was 17.02 m / min.
And send it to the backup roll continuously. Transfer roll times
Rolling speed 16.01m / min, turning of metering roll
Rolling speed is 3.57m / min, transfer roll and metering
Roll interval 280μm, backup roll and transfer
When coating with a gap of 315 μm,
Measured resin content of leg (a₁) Is 342.8 g / m.^Two
 Met. The difference (a) obtained by the calculation is −20.2 g /
m^Two At a level whose absolute value exceeds twice the predetermined value (k)
Met. At this time, it is corrected by the rotation speed of the transfer roll.
Resin content (a _Two ) 2.0 g / m^Two And transfer roll
And the resin content (a
_Three ) At 16.0 g / m^Two And the remaining resin content (a-
a_Three ) Is controlled by the interval between the backup roll and the transfer roll.
I will.

The distance between the backup roll and the transfer roll is corrected to 2.30 μm obtained by the following equation. The distance between the transfer roll and the metering roll is 10.14 μm obtained by the following equation.
The rotation speed of the transfer roll is determined by the following equation.
Correct to 29 m / min. That is, an instruction signal is transmitted from the discriminator, the interval between the backup roll and the transfer roll is closed by 2.30 μm, the interval between the transfer roll and the metering roll is opened by 10.14 μm, and the rotation speed of the transfer roll is set to 0.29 m. / Min.・ Correction value of the interval between backup roll and transfer roll (μ
m) = ｛20.2 (g / m ² ) -16.0 (g / m
² )｝ ÷ 1.827 (g / m ² ) × 1 (μm) = 2.3
0 • Correction value (μm) of the interval between the transfer roll 4 and the metalling roll 5 = ｛16.0 (g / m ² ) −2.0 (g / m)
² )｝ ÷ 1.38 (g / m ² ) × 1 (μm) = 10.1
4. Correction value of rotation speed of transfer roll (m / min) = 2.
0 (g / m ² ) ÷ 0.678 (g / m ² ) × 0.1 (m
/Min)=0.29 In this way, by accelerating the transfer roll 4, the resin content of the prepreg could be made 363 g / m ² .

[0042]

According to the method for producing a prepreg of the present invention, the presence or absence of control of the interval between the transfer roll and the backup roll depends on the difference between the measured resin content of the prepreg 1) and the preset resin content. Accurate adjustment can be realized by determining whether or not to control the interval between the transfer roll and the metering roll that supplies the thermosetting resin composition to the transfer roll, and whether or not to control the rotation speed of the transfer roll. It is.

[Brief description of the drawings]

FIG. 1 is a schematic view of a manufacturing apparatus showing an example of an embodiment corresponding to the present invention.

FIG. 2 is a flowchart of the present invention.

FIG. 3 is a flowchart of the present invention.

FIG. 4 is a flowchart of the present invention.

FIG. 5 is a flowchart of the present invention.

FIG. 6 is a graph showing a change in resin content of a prepreg with respect to a change in rotation speed of a transfer roll used in an example.

FIG. 7 is a graph showing a change in the resin content of the prepreg with respect to a change in the distance between the transfer roll and the metalling roll used in the examples.

FIG. 8 is a graph showing a change in a resin content of a prepreg with respect to a change in an interval between a backup roll and a transfer roll used in Examples.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 prepreg 2 glass substrate 3 backup roll 4 transfer roll 5 metalling roll 6 thermosetting resin composition 7 inspection device 8 discriminator 9 heating device

Claims (7)

[Claims] 1. While continuously feeding a glass substrate to a backup roll, a thermosetting resin composition containing no diluting solvent is supplied in a molten state to a transfer roll disposed opposite to the backup roll, Production of a prepreg in which the thermosetting resin composition is transferred from a transfer roll to one surface of the glass base material and coated, and the thermosetting resin composition is impregnated into the glass base material and then heated to semi-harden the thermosetting resin composition. In the method, the resin content of the prepreg is measured by an inspection device, a difference between the measured value and a preset resin content is calculated by a discriminator, and according to the calculated data, the transfer roll and the backup roll are compared. Determines whether to control the gap, whether to control the gap between the transfer roll and the metalling roll that spreads the thermosetting resin composition on the outer peripheral surface of the transfer roll, and whether to control the rotation speed of the transfer roll. A method for manufacturing a prepreg, wherein each control is performed based on the result of the determination. 2. The method according to claim 1, wherein when the absolute value of the difference between the resin content of the prepreg and the set resin content is equal to or less than a predetermined value, the rotation speed of the transfer roll is controlled. Prepreg manufacturing method. 3. When the absolute value of the difference between the resin content of the prepreg and the set resin content exceeds a predetermined value and is equal to or less than twice the predetermined value, the transfer roll and the transfer roll are provided with a thermosetting resin. 3. The method for producing a prepreg according to claim 1, wherein the interval between the metalling rolls for supplying the composition is controlled. 4. When the absolute value of the difference between the resin content of the prepreg and the set resin content exceeds twice a predetermined value, controlling the interval between the transfer roll and the backup roll is performed. The method for producing a prepreg according to any one of claims 1 to 3, wherein 5. The rotation speed of the transfer roll is 0.1 m / m.
The method for producing a prepreg according to any one of claims 1 to 4, wherein a resin content of the prepreg that fluctuates in units of in is obtained in advance, and the rotation speed of the transfer roll is controlled based on the fluctuation amount. 6. The method according to claim 1, wherein the resin content of the prepreg in which the distance between the transfer roll and the metalling roll fluctuates in units of 1 μm is determined in advance, and the distance between the transfer roll and the metalling roll is controlled based on the amount of fluctuation. A method for producing a prepreg according to any one of claims 1 to 5, characterized in that: 7. The resin content of a prepreg in which the distance between the transfer roll and the backup roll fluctuates in units of 1 μm is determined in advance, and the distance between the transfer roll and the backup roll is controlled based on the fluctuation amount. A method for producing a prepreg according to any one of claims 1 to 6.