JPH09254236A - Apparatus for controlling film thickness - Google Patents

Abstract

PROBLEM TO BE SOLVED: To finely perform metering raw material consumption time by a method wherein feeding speed of a raw material is increased or decreased when the lower limit or the upper limit set value is metered and when the top upper limit is metered, feeding is stopped and the amt. of extrusion is calculated from the measured time between the upper limit and the lower limit and the crosssectional area of a product is made to a specified value by controlling the take-off speed. SOLUTION: A solenoid switch cylinder 14 provided in a shoot 13 between a raw material feeding part 11 and a raw material metering part 12 adjusts feeding speed of the raw material. In addition, a raw material metering control part 17 outputs a signal by which the solenoid switch cylinder 14 is fully opened by detection of the lower limit set value to an input value of a wt. detecting sensor 15 and an opening for reduced speed is set by the reduced speed setting value and full closing is set by the upper limit set value to the feeding speed adjusting part 16 to calculate the amt. of extrusion. In addition, the raw material metering control part 17 calculates take-off speed from the amt. of extrusion per unit time based on a set value detecting time from the upper limit to the lower limit and a driving motor 51 of a take-off machine is controlled by a take-off control part 18 to control the thickness of a cylindrical film.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a folding diameter controller for controlling a cylindrical film extruded from a die mounted in front of an extrusion molding machine in the extrusion direction to a predetermined diameter.
The present invention relates to a film product extrusion molding apparatus equipped with a take-up machine for taking a cylindrical film product having a predetermined product size by the folding diameter controller so as to have a predetermined thickness. The present invention relates to a film thickness control device that controls film thickness by adjusting speed.

[0002]

2. Description of the Related Art In a conventional film product extrusion molding apparatus, a heating cylinder into which raw materials are fed, a rotatable screw housed in the heating cylinder, a motor for rotating the screw, and a heat inside the heating cylinder. Screen (net) that rectifies the molten raw material and sends it to the adapter
And a die connected to the adapter. Then, the raw material melted in the cylinder is pushed out by a screw,
The cylindrical film extruded from the die is taken by a take-off machine.

In this case, in order to produce a product having a predetermined thickness due to the clogging of the screen generated during the continuous operation of the extrusion molding apparatus, the variation in the supply of the raw material to the heating cylinder, and the like, the extrusion amount is required. It is necessary to always maintain a constant ratio between the take-up speed and the take-up speed.

As a method of keeping this ratio constant, conventionally, the following adjustment work has been performed.

That is, the thickness of the product is directly measured with a micro gauge or the like, and the take-up speed or the screw rotation is changed according to the measured thickness so that the product thickness falls within the standard range required for the product. In addition, the site worker is performing adjustment work.

Recently, a technique for automatically performing the above-mentioned adjustment work using a microcomputer or the like has been proposed and put into practical use (for example, Japanese Patent Publication No. 6-13190).
Reference).

This prior art (hereinafter referred to as prior art 1)
In the middle of feeding the raw material to the heating cylinder, a measuring kettle (raw material measuring section), an opening / closing cylinder, and an automatic take-up speed control panel are arranged, and based on the upper limit set value _TH and the lower limit set value _{TL of} the raw material measuring section. The open / close cylinder is opened and closed.

FIG. 5 is a timing chart of raw material charging according to the prior art 1.

That is, first, at the time when the measured value in the raw material measuring section falls below the lower limit set value W _L (t51), the open / close cylinder is fully opened to supply the raw material to the raw material measuring section, and the raw material measuring section sets the upper limit set value W _{L. When H} is detected (t52), the open / close cylinder is fully closed to stop the supply of the raw material to the raw material measuring section. Then after, the time from the moment the material metering unit detects again the upper limit set value W _H by the operation of the extrusion apparatus (t53), until the moment of detecting the lower limit set value W _L (t54) (T52)
Is measured, and the take-up speed is calculated from this measurement result.

[0010]

However, in the prior art 1, the raw material opening / closing cylinder is used for batch weighing for measuring the raw material consumption amount by detecting the lower limit set value by the weight detection sensor and the upper limit set value. However, even if the raw material open / close cylinder is closed with the upper limit set value, the raw material supply chute from the raw material supply section to the raw material metering section has a certain diameter. However, the raw material will exceed the upper limit set value and will enter the excess. Therefore, the raw material consumption amount cannot be started until the extra raw material is consumed and the upper limit set value is exceeded.

When the pipe diameter of the raw material supply chute is reduced, the excess raw material input exceeding the upper limit value is reduced. There was a problem that the measuring time became long and it was not possible to precisely measure the consumption of raw materials and adjust the take-up speed.

For the above reasons, in order to finely measure the amount of raw material consumed during the operation of the extrusion molding device and adjust the take-up speed, the batch feeding is performed while maintaining the feed rate of the raw material to the raw material measuring section to some extent. It is necessary to reduce the amount of extra raw material input so that the raw material consumption can be measured sufficiently.

As a method of measuring the amount of consumption, which is not a powder or granular material, there is a technique disclosed in Japanese Patent Publication No. 47-31473 (this is referred to as prior art 2).

In the prior art 2, an upper limit set value W _H and a lower limit set value W _L for measuring consumption time are provided, and the upper limit set value W _H is slightly above and the lower limit set value W _L is slightly below. The lower and lower limit set values W _LL and the upper and upper limit set values W _HH for opening and closing the flow path are provided to determine the flow rate per unit time.

FIG. 6 is a timing chart for feeding raw materials when the prior art 2 is applied to the prior art 1.

That is, after the fluid has gone below the lower limit set value W _L , the flow path closing device (opening / closing cylinder) is opened at the time (t61) when the lower limit set value W _LL is reached, and then the fluid is set to the upper limit. When the value exceeds the upper limit value W _HH and exceeds the upper limit value W _H (t
In 62), the open / close cylinder is closed. Then, after that, the time (T62) from the moment (t63) when the fluid again falls below the upper limit set value W _H to the moment (t64) where it falls below the lower limit set value W _L is measured, and the flow rate is calculated from this measurement result. It is like this.

As described above, when the method of the prior art 2 is applied to the extrusion molding apparatus of the prior art 1, the closing operation of the open / close cylinder is performed when the upper and upper limit set value W _HH is detected (t62). As a result, the excess amount of raw material input increases, making it more difficult to measure the raw material consumption amount and adjust the take-up speed.

The present invention was devised to solve the above problems, and an object thereof is to supply a raw material which is as close as possible to the difference between the lower limit setting value and the upper limit setting value of the raw material measuring section during the raw material measuring operation. By supplying the raw material to the raw material measuring unit from the above-mentioned unit, the raw material consumption time during the operation of the extrusion molding apparatus can be precisely measured.

[0019]

In order to solve the above-mentioned problems, the film thickness control device according to claim 1 of the present invention comprises:
Folding diameter controller that controls the cylindrical film extruded from the die attached in the extrusion direction forward of the extrusion molding machine to a predetermined diameter, and a cylindrical film product that has a predetermined product size by this folding diameter controller In a film product extrusion-molding apparatus equipped with a take-up machine for pulling the material into a heating cylinder of the extrusion-molding machine. One raw material hopper, and a supply speed adjusting unit having a mechanism for adjusting the supply start and stop of the supply of the raw material from the raw material supply unit to the raw material measuring unit, and a mechanism for adjusting the supply speed of the raw material,
The lower limit set value, the deceleration set value, and the upper limit set value are set as the measured value of the raw material supplied from the raw material supply section to the raw material measuring section, and at the time of the raw material measuring operation, when the lower limit set value is measured. When starting the supply of the raw material to the raw material measuring unit by adjusting the supply speed adjusting unit so that the supply speed of the raw material becomes maximum, and when measuring the deceleration set value,
The feed rate adjusting unit is adjusted to reduce the feed rate of the raw material by a predetermined rate to continue the feed of the raw material to the raw material measuring unit, and when the upper limit set value is measured, the feed of the raw material is stopped. A raw material metering control unit that adjusts the supply speed adjusting unit to stop the supply of raw material to the raw material measuring unit, and a raw material supplied to the raw material measuring unit during operation of the extruder after the raw material measuring operation. The time from the time when the measured value passes the upper limit set value to the time when the lower limit set value is passed, and the extrusion rate is calculated from the measured time, and the cross-sectional area of the cylindrical film product is a predetermined value. And a take-up control unit that controls the take-up speed of the take-up machine.

A film thickness control apparatus according to a second aspect of the present invention is the film thickness control apparatus according to the first aspect, wherein the raw material metering control section has a lower limit set value, a supply stop set value, and The upper limit set value is set, the supply stop set value is set to a value slightly lower than the upper limit set value, and the lower limit set value is measured so that the amount of raw material slightly exceeding the upper limit set value can be input. When the supply rate of the raw material is maximized, the supply rate adjusting unit is adjusted to start the supply of the raw material to the raw material measuring unit, and the supply of the raw material is supplied when the supply stop set value is measured. The supply speed adjusting unit is adjusted so as to stop the supply of the raw material to the raw material measuring unit.

[0021]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a schematic configuration diagram of a film thickness control device according to claim 1 of the present invention, and FIG. 2 is a schematic configuration of a film product extrusion molding device to which the film thickness control device of the present invention is applied. It is a figure.

The film product extrusion molding apparatus shown in FIG.
A die 2 is connected to the front of the extrusion molding machine 1 in the extrusion direction A, and the cylindrical film 3 is extruded upward from the die 2. Then, the extruded cylindrical film 3 is formed into a predetermined diameter by the folding diameter controller 4 and then taken up by the take-up machine 5 so as to have a predetermined thickness (cross-sectional area), and is taken by a take-up machine (not shown). It is designed to be wound up.

The folding diameter controller 4 is a cold air blower 4 arranged so as to surround the compressed air source 41 inserted through the die 2 and the cylindrical film 3 extruded from the die 2.
2, and a cooling device 43 that supplies cold air to the cold air blower 42. Further, the take-up machine 5 is arranged above the guide plates 6 and 6 for guiding the cylindrical film 3 and is driven by the drive motor 51.
2, 53.

Although not shown, the extrusion molding machine 1 includes a heating cylinder into which raw materials are fed, a rotatable screw accommodated in the heating cylinder, a motor for rotating the screw, and a heating cylinder. It is provided with a screen (net) for rectifying the heat-melted raw material in the cylinder and sending it to the adapter, and the die 2 is connected to the adapter.

The extrusion molding machine 1 is provided with two raw material hoppers, a raw material supply section 11 and a raw material measurement section 12, and the raw material supply section 11 and the raw material measurement section 12 have a raw material supply tube (hereinafter referred to as a chute). ) 13 are connected.

In the middle of the chute 13, an electromagnetic opening / closing cylinder (supply speed adjusting unit) 1 for starting and stopping the supply of the raw material from the raw material supply unit 11 to the raw material measuring unit 12 is provided.
4 is provided, and the opening degree of the electromagnetic opening / closing cylinder 14 is adjusted by a supply speed adjusting unit 16 that adjusts the supply speed of the raw material.

In the present embodiment, the feed rate of the raw material can be adjusted in two stages by the feed rate adjusting unit 16, and the electromagnetic opening / closing cylinder 14 is fully opened so that the chute 13 can be charged by the diameter of the chute 13. It is a two-step adjustment of the deceleration state in which the deceleration opening is set to an arbitrary deceleration opening (a few% of full opening) with respect to the diameter.

Further, the raw material measuring unit 12 includes the raw material measuring unit 1
A weight detection sensor 15 for detecting the raw material weight of No. 2 in real time is provided.
Is output to the raw material measurement control unit 17.

The lower limit set value W _L , the deceleration set value W _D , and the upper limit set value W _H are set in the raw material measurement control unit 17 as the measured values for the input value of the weight detection sensor 15,
When the lower limit setting value W _L is detected, the electromagnetic opening / closing cylinder 14 is fully opened, when the deceleration setting value W _D is detected, the electromagnetic opening / closing cylinder 14 is set as a deceleration opening, and when the upper limit setting value _WH is detected, the electromagnetic opening / closing cylinder 14 is fully closed. The signal to perform is output to the supply speed adjusting unit 16.

Further, the raw material measurement control unit 17 calculates the take-up speed for controlling the thickness of the cylindrical film 3,
The calculated value is output to the take-up control unit 18 to control the drive motor 51 of the take-up machine 5.

Next, the operation of the film thickness control device having the above-described structure when measuring raw materials will be described with reference to the timing chart of raw material charging shown in FIG. However, in FIG. 3, for comparison with the film thickness control apparatus of the present invention, a timing chart of raw material feeding according to the conventional technique 1 is shown by a one-dot chain line.

In the raw material metering operation, first, when the measured value in the raw material measuring section 12 falls below the lower limit set value W _L (t1), the electromagnetic opening / closing cylinder 14 is fully opened to supply the raw material to the raw material measuring section 12. When the metering unit 12 detects the deceleration set value W _D (t2), the electromagnetic opening / closing cylinder 14 is set to the deceleration opening (a few% of the full opening), and the supply of the raw material to the raw material measuring unit 12 is continued. After switching to deceleration degree is increased raw material feeding becomes gentle, material metering unit 12 to the electromagnetic switch cylinder 14 is fully closed at time (t3) which detects the upper limit set value W _H.

After that, the raw material is operated by operating the extrusion molding device.
The weighing unit 12 again sets the upper limit value W_HThe moment (t
4) From the lower limit set value W_LUntil the moment (t5) at which is detected
The time (T) is measured. This time T is always constant
(Upper limit set value W_H-Lower limit set value W _L) Raw material is consumed
This is equivalent to the time
Therefore, the extrusion rate (raw material consumption) per unit time can be calculated.
Wear. Then, the take-off speed is calculated from this calculation result.
Swelling.

According to the present embodiment, after switching to the deceleration opening (after time t2), the increase in the amount of raw material input is slower than in the case of the prior art 1. Further, although a slight amount of extra raw material is added to the upper limit set value W _H , the amount is much smaller than in the case of the prior art 1, and therefore the raw material is supplied from the start of the operation of the extrusion molding apparatus to the upper limit set value W _H. The time to reach _H (measurement start time) is also shorter than that in the case of the conventional technique 1. This is the same when the prior art 2 is applied to the prior art 1.

As a result, the proportion of the measurement time T in the operating time of the extruder 1 increases, and the take-up speed can be more finely adjusted based on the measurement result of the extrusion amount.

Next, the structure of the film thickness control device according to the second aspect will be described.

In this embodiment, the raw material metering control unit 17 sets the lower limit set value W _L , the supply stop set value W _E , and the upper limit set value W _H as the measured values with respect to the input value of the weight detection sensor 15. are, outage set value W _E, as can be turned the amount of material exceeding the upper limit set value W _H slightly, are set to a value slightly lower than the upper limit set value W _H.
Further, the raw material measurement control unit 17 fully opens the electromagnetic opening / closing cylinder 14 upon detection of the lower limit set value W _L , and sets the supply stop set value W _E.
A signal for fully closing the electromagnetic open / close cylinder 14 is output to the supply speed adjusting unit 16 upon detection of.

The rest of the configuration is exactly the same as the configuration of the film thickness control device shown in FIG. 1, so a detailed description is omitted here.

Next, the operation of the film thickness control device having the above-mentioned structure when measuring the raw material will be described with reference to the timing chart of raw material charging shown in FIG. However, in FIG. 4, for comparison with the film thickness control apparatus of the present invention, a timing chart of raw material charging according to the conventional technique 1 is shown by a chain line.

In the raw material metering operation, first, when the measured value in the raw material measuring section 12 falls below the lower limit set value W _L (t11), the electromagnetic opening / closing cylinder 14 is fully opened to supply the raw material to the raw material measuring section 12. When the measuring unit 12 detects the supply stop set value W _E (t12), the electromagnetic opening / closing cylinder 14 is fully closed. After the electromagnetic opening / closing cylinder 14 is fully closed, an extra amount of charge known in advance (that is, the amount remaining in the chute 13 from the electromagnetic opening / closing cylinder 14 to the raw material measuring unit 12) is supplied to the raw material measuring unit 12. To be done. The input amount is as described above, is set to an amount that raw material charging occurs a slight excess relative to the upper limit set value W _H.

[0042] Then after, at the moment when the material weighing unit 12 detects again the upper limit set value W _H by the operation of the extrusion apparatus (t1
The time (T) from 3) to the moment (t14) at which the lower limit setting value W _L is detected is measured. Since this time T is always equivalent to the time when a fixed amount (upper limit set value _WH -lower limit set value W _L ) of the raw material is consumed, by measuring the time T, the extrusion amount per unit time (raw material Consumption amount) can be calculated. Then, the take-up speed is calculated from this calculation result.

According to the present embodiment, although an extra raw material feeding slightly relative to the upper limit set value W _H is generated, the operation of the compared with the conventional art 1 the amount is very small, thus extruder time from the start until the starting material is the upper limit set value W _H (measurement starting time) is shorter than that of the prior art 1. This is the same when the prior art 2 is applied to the prior art 1.

As a result, the proportion of the measuring time T in the operating time of the extruder 1 increases, and the take-up speed can be more finely adjusted based on the result of measuring the extrusion amount.

Next, a method for controlling the thickness of the cylindrical film 3 using the raw material metering according to each of the above embodiments will be described.

The thickness control method is carried out in the order of calculating the extrusion rate Q, the average extrusion rate QV, and the take-up speed LS.

The extrusion amount Q is calculated by the following equation (1).

[0048]

[Formula 1] Extrusion amount Q1 (Kg / H) = (3600 (SEC) x reference weight (Kg)) / T1 (SEC) (1) where reference weight (Kg) = upper limit set value _WH ( Kg) -lower limit set value W _L (Kg).

Further, the average extrusion rate QV is calculated by the above equation (1) in order to eliminate the influence of a short-term variation in the extrusion rate, and Q1, Q2 of T1, T2, T3, T4 ... , Q
6 are sequentially arranged from the latest data in the order of 3, Q4, ... Continuously, and the average value of the 4 Q data excluding the maximum and minimum QN data is QV.

[0050]

## EQU00002 ## Average extrusion rate QV = (QN1 + QN2 + QN3 + QN4 + QN5 + QN6) / 4 (2) where (QN1 + QN2 + QN3 + Q) in the above equation (2)
N4 + QN5 + QN6) is an array of four data excluding the maximum and minimum data.

The take-up speed LS is calculated by the following equation (3).

[0052]

## EQU00003 ## Collection speed LS (m / min) = average extrusion rate QV / (width × thickness × density × coefficient) (3) And the collection speed LS (m / mi calculated in this way
The value of n) is output to the take-up control unit 18, the drive motor 51 of the take-up machine 5 is controlled, and the thickness of the cylindrical film 3 is controlled within the range of the product standard.

[0053]

The film thickness control apparatus according to the first aspect of the present invention comprises two raw material hoppers, a raw material feeding section and a raw material measuring section, which are arranged on the way of feeding the raw material to the heating cylinder of the extruder. A feed rate adjusting section having a mechanism for controlling the start and stop of the feed of the raw material from the raw material supply section to the raw material measuring section, and a raw material supplied from the raw material supply section to the raw material measuring section The lower limit set value, deceleration set value, and upper limit set value are set as the measured values of the raw material, and the feed rate adjusting unit is configured to maximize the feed rate of the raw material when the lower limit set value is weighed during the raw material weighing operation. To start the supply of the raw material to the raw material measuring section, and when the deceleration set value is measured, adjust the supply speed adjusting section to reduce the raw material supply speed by a predetermined speed and adjust the raw material to the raw material measuring section. Continue to supply When the set value is weighed, the feed rate adjusting unit is adjusted so that the feed of the raw material is stopped, and the raw material metering control unit that stops the supply of the raw material to the raw material measuring unit, and the extruder after the raw material measuring operation are performed. During operation, the time from when the measured value of the raw material supplied to the raw material measuring unit passed the upper limit set value to when it passed the lower limit set value was measured, and the extrusion amount was calculated from the measured time, and the cylindrical shape was measured. Since the film control unit controls the take-up speed of the take-up machine so that the cross-sectional area of the film product becomes a predetermined value, the standby time for measuring the raw material consumption is measured by the conventional technique. Shorter than 1 and 2. Therefore, the number of times the raw material consumption is measured during the operation of the extruder also increases, so that the interval of the take-up speed adjustment becomes shorter and the speed can be finely adjusted. Also,
When the deceleration set value is detected, for example, the electromagnetic opening / closing cylinder, which is the supply speed adjusting unit, is set to the deceleration opening (a few% of the full open), and when the upper limit setting value is detected, the electromagnetic opening / closing cylinder is fully closed. The mechanical vibration repeatedly applied to the weight detection sensor provided in the raw material measuring section is reduced, and the vibration and impact when the electromagnetic opening / closing cylinder is fully closed are significantly reduced. As a result, the raw material consumption can be stably measured, and the life and accuracy of the measuring mechanism can be improved.

In the film thickness control device according to the second aspect of the present invention, the lower limit set value, the supply stop set value, and the upper limit set value are set in the raw material metering control unit, and the lower limit set value is measured. Sometimes, the feed rate adjusting unit is adjusted so that the feed rate of the raw material is maximized to start feeding the raw material to the raw material measuring unit, and when the feed stop set value is measured, the feed of the raw material is stopped. Since the supply speed adjusting unit is adjusted to stop the supply of the raw material to the raw material measuring unit, when measuring the raw material consumption, the standby time for the measurement becomes shorter than that of the conventional techniques 1 and 2. . Therefore, the number of times the raw material consumption is measured during the operation of the extruder also increases, so that the interval of the take-up speed adjustment becomes shorter and the speed can be finely adjusted.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of a film thickness control device corresponding to claim 1 of the present invention.

FIG. 2 is a schematic configuration diagram of a film product extrusion molding apparatus to which the film thickness control apparatus of the present invention is applied.

FIG. 3 is a timing chart of raw material charging for explaining an operation at the time of raw material measurement corresponding to claim 1.

FIG. 4 is a timing chart of raw material charging for explaining an operation at the time of raw material measurement corresponding to claim 2;

FIG. 5 is a timing chart of raw material charging according to the related art 1.

FIG. 6 is a timing chart of raw material charging when the related art 2 is applied to the related art 1.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Extruder 2 Die 3 Cylindrical film 4 Folding diameter controller 5 Take-up machine 11 Raw material supply section 12 Raw material measuring section 13 Chute (raw material supply cylinder) 14 Electromagnetic opening / closing cylinder (supply speed adjusting section) 16 Supply speed adjusting section 17 Raw material Weighing control unit 18 Collection control unit

Claims (2)

[Claims] 1. A folding diameter controller for controlling a cylindrical film extruded from a die attached in front of an extrusion molding machine in a direction of extrusion to a predetermined diameter, and a predetermined product size by the folding diameter controller. In a film product extrusion-molding apparatus equipped with a take-up machine that draws a cylindrical film product into a predetermined thickness, a raw-material supply section disposed while supplying a raw material to a heating cylinder of the extrusion-molding machine, Two raw material hoppers of a raw material measuring unit, a supply speed adjusting unit having a mechanism for controlling the start and stop of the supply of the raw material from the raw material supply unit to the raw material measuring unit, and a mechanism for adjusting the supply speed of the raw material, The lower limit set value, the deceleration set value, and the upper limit set value are set as the measured values of the raw material supplied from the raw material supply section to the raw material measuring section, and the lower limit set value is set during the raw material metering operation. When was measured, to start the supply of the raw material to the raw material measuring unit by adjusting the supply rate adjusting unit so that the supply rate of the raw material becomes maximum, when measuring the deceleration set value,
The feed rate adjusting unit is adjusted to reduce the feed rate of the raw material by a predetermined rate to continue the feed of the raw material to the raw material measuring unit, and when the upper limit set value is measured, the feed of the raw material is stopped. A raw material metering control unit that adjusts the supply speed adjusting unit to stop the supply of the raw material to the raw material measuring unit; and a raw material supplied to the raw material measuring unit during operation of the extruder after the raw material measuring operation. The time from the time when the measured value passes the upper limit set value to the time when the lower limit set value is passed, and the extrusion rate is calculated from the measured time, and the cross-sectional area of the cylindrical film product is a predetermined value. And a take-up controller for controlling the take-up speed of the take-up machine. 2. The lower limit set value,
With the supply stop set value, and the upper limit set value is set, the supply stop set value is set to a value slightly lower than the upper limit set value, so that the amount of raw material slightly exceeding the upper limit set value can be charged. When the lower limit set value is measured, the feed rate adjusting unit is adjusted so that the feed rate of the raw material is maximized, the supply of the raw material to the raw material measuring unit is started, and the supply stop set value is measured. The film thickness control according to claim 1, wherein the film feed rate adjusting unit is adjusted so as to stop the supply of the raw material, and the supply of the raw material to the raw material measuring unit is stopped. apparatus.