JPS5837139B2 - Entire film - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to adjusting thickness unevenness of a cylindrical film made of plastic or the like, and particularly to an automatic film deflection adjusting device using a pending lip type die.

Conventional pending lip type dies measure the thickness of the formed film, and a trained worker gives a rough estimate based on experience and feeling, adjusts the tightening of the adjustment bolt, and presses the die. The lip thickness was adjusted.

However, this adjustment work is extremely troublesome and depends largely on the experience and sensitivity of the operator, and not only is it a waste of time and labor, but most of the film discharged during this work does not become a product, resulting in a lot of wasted raw materials. Ta.

The present invention eliminates the above-mentioned drawbacks, automatically measures the thickness of the film, automatically performs the lip preparation work based on the results, and eliminates the loss of time, labor, and waste of raw materials. An object of the present invention is to provide a device that automatically adjusts the lip thickness of a die, that is, the uneven thickness of a cylindrical film.

Next, one embodiment of the present invention will be explained with reference to the accompanying drawings. 1 is an extruder that feeds plastic raw materials sufficiently kneaded into a pending-lip type die 2 (hereinafter simply referred to as the die) and extrudes it as a cylindrical bubble 3. It is.

The valve 3 is folded by a pinch roll 4, moves in the direction of arrow a, and is wound up by a winding roll (not shown).

Reference numeral 5 denotes adjustment bolts I for adjusting the lip thickness of the die 2, which are screwed together at equal intervals in the circumferential direction of the flange portion 6, and whose ends are axially attached to the fixing member 6A facing the flange portion 6. It does not move, but is rotatably supported.

Reference numeral 9 denotes a ring-shaped gear that is supported by the die 2 via a bearing 10 and rotates around the die 2 around the axis of the die 2.

Reference numeral 13 denotes a gear fixed to one end of the adjustment bolt 5, and is configured to rotate by meshing with a gear 15 attached to the pulse smoke 14.

Then, as the pulse motor 14 rotates, the adjusting bolt is pushed and pulled to bend the flange portion 6, and a lip 8 is formed between the inner die 7 and the outer die having the flange portion 6.
The thickness of the film is adjusted.

Reference numeral 11 denotes a film thickness measuring device for measuring the film thickness of the bubble 3, which is installed on a stand 12 attached to the ring gear 9. As the ring gear 9 rotates, it rotates around the bubble 3 and detects β-rays at a predetermined position. etc., and the film thickness is measured based on the amount of reflection.

The pulse motor 14 is slidably mounted in the radial direction of the ring gear 9 by an air cylinder 17 operated by a switching valve 16.

Therefore, the gears 13 and 15 can be engaged or disengaged.

Reference numeral 18 denotes a pulse motor to which a gear 19 that meshes with the ring-shaped gear 9 is attached to rotate the ring-shaped gear 9.

Reference numerals 20 and 21 are circuit indicating devices for specifying the circuit, and the former is used to measure the film thickness, and the latter is used to set electric quantities such as voltage in advance to transmit signals for instructing the circuit to adjust the lip thickness of the die 2. It is something to keep.

The changeover switch 22 is used to switch between the former and the latter.

Reference numeral 23 denotes an amplification device which amplifies the film thickness measured by the film thickness measuring device 11 by an amount of electricity such as voltage or current, and transmits the amplified film thickness to the comparison/judgment device 24 .

The comparison and determination device 24 determines the work content of the signal transmitted from the film thickness measuring device 11 based on the signal from the circuit instruction device 20 or 21, and transmits it to either a storage device 25 or a comparison and determination device 26, which will be described later. It is something.

The memory device 25 stores information that is predetermined in the film thickness measuring device 11 when the job content is to measure film thickness, that is, when the circuit indicating device 20 is activated and acting on the comparison/judgment device 24 of the film thickness measuring circuit. It stores all the measured values at the measured positions, of which the maximum value is stored in the maximum value storage device 21, and the minimum value is stored in the minimum value storage device 28.
It is to be memorized.

Reference numeral 29 denotes a comparison/judgment device which repeats the pulse until the number of measurement positions measured by the film thickness measuring device 11 passing through the comparison/judgment device 29 reaches the number of times preset in the setting device 30 for setting the number of measurement positions. An electric signal that rotates the motor 18 is transmitted to the signal transmitter 31, and when the number of electric signals generated each time the thickness measurement passes through the comparison/judgment device 29 reaches the number of times set in the setting device 30, a comparison is performed. An electric signal is applied to the determination device 32.

The comparison and determination device 32 determines whether the difference between the maximum value stored in the maximum value storage device 27 and the minimum value stored in the minimum value storage device 28 is within the tolerance range set in the tolerance value setting device 33. a signal transmitting device 3 that determines whether or not the film thickness is within the range, and if it is within the range, issues a stop signal for the power source (not shown) for driving the pulse motor 18 to stop measuring the film thickness;
4, and if it is outside the range, it is sent to the arithmetic unit 35.

The calculation device 35 averages the film thickness of the bubbles 3 currently being ejected, and stores the result in the storage setting device 36.

The memory setting device 36 applies the average value of the film thickness sent from the arithmetic device 35 as an electrical quantity such as a voltage to the comparison/judgment device 26, and also switches from the circuit indicating device 20 to the circuit indicating device 21. the pulse motor 18 via the selector switch 22 and the signal transmitter 31.
The signal is sent to a signal transmitting device 37 that generates a signal to drive the .

When the changeover switch 22 switches from the film thickness measurement to the lip thickness adjustment circuit of the die 2, that is, from the circuit indicating device 20 to the circuit indicating device 21, by the signal from the electric signal transmitting device 37, the film thickness is measured by the film thickness measuring device 11. The measured values are applied to the comparison and determination device 26 via the comparison and determination device 24.

The comparison/judgment device 26 compares the average value stored in the memory setting device 36 with the measurement result of the film thickness measuring device 11, and the difference is determined in advance by the allowable value setting device 38.
It is determined whether or not it is within the permissible range set in .

If it is within the allowable range, the determination device 39 applies a signal to the signal transmitter 31, drives the pulse motor 18, rotates the ring gear 9, moves the film thickness measurement position one after another, and measures the film thickness in advance. Position number setting device 4
This is done until the number set to 0 is reached, and if the lip thickness is within the allowable range and there is no need to adjust the lip thickness and there is no need to push or pull the adjustment bolt 5, the signal is emitted from the signal transmitter 31. The signal causes the switching valve 16 to move to the B position so that the gears 13 and 15 are disengaged.

On the other hand, if the comparison and determination device 26 determines that the difference between the measurement result and the average value is outside the tolerance range set in the tolerance value setting device 38, the comparison and determination device 26 applies an electric signal to the determination device 41 and adjusts the lip thickness. In order to push or pull the adjustment bolt 5, the switching valve 16 is actuated to engage the gears 15 and 13, and the switching valve 16 is brought to the A position.

The determination device 41 determines whether the signal from the comparison and determination device 26 is positive or negative, and determines whether the pulse motor 14 is to be rotated in the forward direction or in the reverse direction.
, in the case of reverse rotation, it is transmitted to the reverse rotation instruction device 43.

Receiving the signal from the indicating device 42 or 43, the receiver 44 rotates the pulse motor 14 forward or reverse, and gives a film thickness measurement instruction to the film thickness measuring device 11 to measure the film thickness. The aforementioned pulse motor 14
The comparison/judgment device 26 checks again whether or not the lip thickness is within the above-mentioned allowable range due to normal rotation or reverse rotation.

In this way, the lip thickness is adjusted repeatedly until it falls within the allowable range, and when it falls within the allowable range, the pulse motor 18 is rotated via the comparison/judgment device 39, and the ring-shaped gear 14 is turned, so that the lip thickness is successively adjusted. When the thickness adjustment position is moved and a signal is emitted from the comparison and judgment device 39 by the number set in the measurement position number setting device 40, a signal is emitted from the comparison and judgment device 39 and acts on the changeover switch 22, so that the switch 22 is the circuit indicating device 21 which has been indicating the lip thickness measuring circuit until now.
Then, the circuit is switched to the circuit indicating device 20 which indicates the constant circuit on the film thickness side, and the film thickness is measured again.

As explained above, repeat this operation several times,
The film thickness is automatically controlled.

[Brief explanation of drawings]

The attached drawings show one embodiment of the present invention. 1...Extruder, 2...Pending lip die, 3...Bubble, 5...
・Adjustment bolt, 9...Ring gear, 11・
...Film thickness measuring device, 13, 15, 19...
...gear, 14,18...--pulse motor,
16...Switching valve, 20, 21...Circuit indicating device, 22...Switching switch, 24,
26, 39, 29, 32... comparison determination device,
25...Storage device, 31.37...Signal transmitter, 35...Arithmetic device, 41...
・Judgment device.

Claims (1)

[Scope of Claims] 1. An automatic deflection adjustment device for a cylindrical film using a pending-lip type die, which comprises the following constituent elements. a. a plurality of lip adjustment bolts arranged at equal intervals in the cylindrical direction of the lip adjustment flange of the die, which are pushed and pulled by the rotation of the attached gear; b. a ring-shaped gear supported by the die via a bearing and rotating around the die around the axis of the die; C. provided on a pedestal attached to the ring-shaped gear,
a film thickness measuring device that measures the film thickness of bubbles by moving around the bubbles discharged from the die as the ring-shaped gear rotates; d. The gear attached to the output shaft is movable in the radial direction of the ring gear by an air cylinder or the like operated via a switching valve so that the gear attached to the adjustment bolt engages or disengages. a pulse motor for rotating and pushing/pulling the adjustment bolt; e. a pulse smoker equipped with a gear that meshes with the ring-shaped gear and rotates the ring-shaped gear; f. It is determined whether the measured value measured by the film thickness measuring device is within a predetermined tolerance range, and if the measured value is outside the tolerance range, the lip thickness of the die is automatically adjusted. A control mechanism that drives and controls two pulse motors, switching valves, etc.