JPH03165865A - Liquid resin feeder of liquid resin tank and controlling method for supplying liquid resin - Google Patents

Abstract

PURPOSE:To uniformize the coated thickness of a liq. resin on a base and to produce a stabilized-quality impregnated sheet by controlling the opening degree of a control valve in accordance with a signal from a measuring part to fix the liq. level. CONSTITUTION:The liq. resin tank 1 contg. a liq. resin 7 to be supplied between a backup roll 5 and a doctor knife 6, an ultrasonic wave transmitter-receiver 2 for emitting an ultrasonic wave toward the liq. resin surface in the tank 1 and receiving the reflected wave, the measuring part 3 for measuring the height of the liq. surface connected to the transmitter-receiver and the valve 4 capable of controlling the supply of the resin 7 to the tank 1 and connected to the output terminal of the part 3 are provided. The opening degree of the valve 4 is controlled in accordance with the signal from the part 3 to fix the liq. surface. Accordingly, the liq. surface in the tank 1 is kept at a fixed position, the supply of the resin 7 to the doctor knife 6 is stabilized, and the coated thickness on the sheet base 10 is uniformized.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for supplying a resin liquid in a resin liquid tank, and particularly to a technique for maintaining a constant coating thickness on a substrate.

[Conventional technology]

Conventionally, prepreg manufacturing equipment and SCM (She
A process for impregnating a pre-adjusted resin is essential in a manufacturing device for molding compound.

Prepreg is a semi-cured sheet made by impregnating a base material such as glass cloth or paper with a controlled resin varnish and drying it. When impregnating the sheet base material with resin, a doctor knife is used. It is common to use a backup role and a backup role.

That is, with the sheet base material wound around a backup roll, a doctor knife is placed close to the sheet base material, and resin liquid is collected between the blade of the doctor knife and the sheet base material to remove the sheet base material. Apply resin liquid to the material and impregnate it. A replenishment device for periodically replenishing the resin liquid is provided in the portion where the resin liquid is stored, and the resin liquid is replenished at regular intervals based on batch-processed information.

[Problem to be solved by the invention]

Tokoro 8 In the above-mentioned conventional technology, the resin liquid is replenished by batch processing after collecting information for a certain period of time.
The amount of resin liquid at the blade of the doctor knife fluctuates widely, often resulting in uneven coating film thickness.
It was becoming difficult to supply products with stable quality.

The present invention has been made in view of the above, and its purpose is to:
The object of the present invention is to provide a technology that can make the coating thickness uniform regardless of the amount of resin liquid.

[Means to solve the problem]

In order to solve the above problems, the present invention has the following structure.

In other words, there is a resin liquid tank that stores the resin liquid to be supplied between the backup roll and the doctor knife, and an ultrasonic transmitter/receiver that emits ultrasonic waves toward the resin liquid surface of this resin liquid tank and receives the reflected waves. , a measuring section connected to this ultrasonic transmitter/receiver to measure the height of the liquid level, and a control valve connected to the output end of this measuring section and capable of controlling the amount of resin liquid supplied to the resin liquid tank, The liquid level is maintained constant by controlling the opening degree of the control valve in accordance with the signal from the measuring section, and after measuring the real-time information of the reflected waves from the ultrasonic transceiver, the actual What's wrong with the time information? a resin liquid that closes the control valve when the actual time is smaller than the reference time and opens the control valve when the actual time is larger than the reference time; Method 9 for controlling the supply of resin liquid in a tank [Operation] Using the above-described means, the arrival time of the reflected wave f1 is converted to the height of the liquid level, and it is determined whether the liquid volume is appropriate or not, and the control valve is adjusted. By controlling the opening and closing, the liquid level in the resin liquid tank is always kept at a constant position. Therefore, the amount of resin liquid supplied to the doctor knife can be stabilized, and the coating thickness on the sheet base material can be kept uniform.

〔Example〕

Embodiments of the present invention will be described based on FIGS. 1 to 4.

FIG. 1 shows a block diagram of the entire device. In the figure, a base sheet 10 is wound around a backup roll 5, and as the backup roll 5 rotates in all directions, it is transported in a direction F in the figure.

Above this backup roll 5, a doctor knife 6 is arranged diagonally with respect to the roll surface, and between the doctor knife 6 and the backup roll 5 there is a base material sheet.
10 is inserted between them.

The doctor knife 6 is provided with a resin liquid tank 1 containing a resin liquid 7 to be impregnated into the base sheet lO,
A part of the side wall of the resin liquid tank 1 is made up of the doctor knife, and a slit 11 is provided at the bottom of the resin liquid tank 1.

Above this resin liquid tank 1, an ultrasonic transmitter/receiver 2 is provided that emits ultrasonic waves to the resin liquid surface and receives the reflected waves. 3 is connected.

As shown in FIG. 3, the measuring section 3 includes a transmitting section 3a that transmits ultrasonic pulse waves to the ultrasonic transceiver 2, a receiving section 3b that receives the ultrasonic waves reflected on the resin liquid surface, and the transmitting section 3a. A counter section 3c that inputs the starting trigger from the receiving section 3b and a stop trigger from the receiving section 3b, a time storage section 3d that stores the reference reflection time, and a time storage section 3d that stores the real time information from the counter section 3C and the reference in the time storage section 3d. It is comprised of a calculation section 3f that compares the time information and controls the transmission section 3a and the switching section 3e, and a power amplification section 3g that amplifies the output from the calculation section 3f.

With the above configuration, the received ultrasonic wave is amplified and detected, and the counter that starts at the same time as the ultrasonic pulse wave leaves is stopped at the received wave to calculate the time difference between the leaving wave and the received wave.

The output end of this measurement section 3 is connected to a control valve 4, and when the real time information from the counter section 3c is longer than the time information in the time storage section 3d, that is, when the resin liquid level has fallen, the control valve 4 is in an open state.

This control valve 4 is for opening and closing a liquid path from the resin liquid tank l2 to the resin liquid tank 1.

An example of operation will be explained below with reference to FIG.

First, an ultrasonic wave is transmitted from the ultrasonic transmitter/receiver 2 (step 50), and when measurement is started, it is determined that the reflection time of the ultrasonic wave is longer than the specified time, but the liquid level is higher than the reference value. Since this is the case, the control valve 4 is closed (52) and the supply of resin liquid to the resin liquid tank 1 is stopped.

In step 5l, if the reflection time of the ultrasonic wave is longer than the specified time, the liquid level is lower than the reference value.
Since it is in a low state, the control valve 4 is opened (53) and the supply of resin liquid to the resin liquid tank l is started.

As described above, in this embodiment, the height of the liquid level is detected by converting it into the distance between the liquid level and the ultrasonic transmitter/receiver based on the reflection time of the ultrasonic wave. Since the process shown in FIG. 4 is repeated at regular intervals by loop processing, fluctuations in the liquid level can be suppressed to a minimum by shortening these intervals.

Therefore, the amount and pressure of paint supplied to the doctor knife can always be kept constant, and a prepreg or SMC with a stable coating thickness can be manufactured.

Furthermore, according to this embodiment, since the liquid level is detected by non-contact ultrasonic sensing, high reliability can be obtained over a long period of time without liquid adhering to the sensing part. Can be done.

〔Effect of the invention〕

According to the present invention (Dai), a resin liquid tank is provided between the backup roll and the doctor knife to contain the resin liquid to be supplied, and the liquid level of the resin liquid tank can be controlled to always be maintained constant. The coating thickness can be made uniform, and impregnated sheet materials of stable quality can be manufactured.

4 Brief description of the drawings Resin liquid tank Figures 1 to 4 show embodiments of the present invention. Figure 1 is a layout of the entire device, Figure 2 is a perspective view of the main parts, and Figure 3 is a block diagram. 4 are charts showing the control procedure of this embodiment.

1.Resin liquid tank, 2.Ultrasonic transmitting/receiving rod 3.Measurement chamber 4.Control valve, 5.Backup roll, 6.Doctor knife, 4.7.Resin flow 11..Slit, 10..・Base material sheet, l2...resin liquid tank.

Claims (2)

[Claims] (1) A resin liquid tank that contains the resin liquid to be supplied between the backup roll and the doctor knife, and an ultrasonic transceiver that emits ultrasonic waves toward the resin liquid surface of this resin liquid tank and receives the reflected waves. , a measuring section connected to this ultrasonic transmitter/receiver to measure the height of the liquid level, and a control valve connected to the output end of this measuring section and capable of controlling the amount of resin liquid supplied to the resin liquid tank. , a resin liquid supply device in a resin liquid tank, characterized in that the liquid level is maintained constant by controlling the opening degree of a control valve according to a signal from a measuring section. (2) In the resin liquid supply device that applies resin liquid to the sheet base material wound around a backup roll, it is installed above the resin liquid tank that stores the resin liquid and emits ultrasonic waves to the liquid surface, and also reflects the ultrasonic waves. It consists of an ultrasonic transceiver that receives waves, a control valve that controls the supply of resin liquid to the resin liquid tank, and a measurement unit that inputs signals from the ultrasonic transceiver to control the operation of the control valve. , measuring real time information of the reflected wave from the ultrasonic transmitter/receiver, comparing this real time information with reference time information prepared in advance, and controlling the control if the real time is smaller than the reference time. A resin liquid supply control method in a resin liquid tank in which a valve is closed and the control valve is opened when the actual time is greater than a reference time.