JPH0815753B2 - Film width control device - Google Patents

Description

The present invention relates to a film width control device used in a film processing machine.

[Prior Art] Conventionally, this type of film processing machine is provided with a film processing section called a T-die, and by giving the extruded resin to the T-die, the resin is formed into a film having a predetermined thickness and width. It is being processed. Specifically, in the film processing section, the film width can be determined by controlling the position of the deckle inserted in the T die so as to cross the resin extrusion direction.

The film width control device that controls the position of the deckle is used to move the deckle by controlling the motor attached to the deckle.

[Problems to be Solved by the Invention] A conventional film width control device has a preset counter or an encoder, and the film width is determined by setting these counters or the like to empirically determined values.

However, the width of the film that emerges from the T-die is narrower than the width determined by the deckle, and so-called neck-in occurs. Since the amount of this neck-in changes due to various factors, it is very difficult to obtain a desired film width. Further, this means that it is difficult for an expert to obtain a desired product width.

It is an object of the present invention to provide a film width control device that enables even an unskilled person to easily obtain a desired film width.

Another object of the present invention is to provide a film width control device capable of automatically adjusting the deckle to an optimum width.

[Means for Solving Problems] According to the present invention, in a film width control device of a film processing machine using a T-die controlled by Dickel, means for setting a predetermined film width, A sensor unit that monitors at least each factor relating to the film material and the film processing machine and the position of the deckle that influences the neck-in amount, and a neck-in amount according to the film width based on each factor from the sensor unit. A means for obtaining, a means for calculating a positioning amount of the deckle from the film width and the neck-in amount, for automatically controlling the deckle based on the positioning amount of the deckle and the position of the deckle. And a film width control device.

[Embodiment] Referring to FIG. 1, a film width control apparatus according to an embodiment of the present invention is used by being connected to a deckle 11 inserted in a T-die 10. The deckle 11 has a deckle lot 11a, a support shaft for supporting the deckle lot 11a, and an inner deckle 11b. The illustrated film width control device moves the deckle lot 11a and the inner deckle 11b in the left-right direction in the drawing to control the width of the resin extruded from the T die 10 in the front-back direction in the drawing. For this reason, Dikel 11
A motor 12 is attached to the.

Referring also to FIG. 2, the opening length D of the T die 10 is determined by the deckle 11 in the T die 10. At this time, the width L of the extruded film 13 is narrower than the opening length D. The difference between the opening length D and the width L of the film is called the neck-in amount, which is indicated by a and b on the left and right sides in the figure.

This neck-in amount changes depending on the viscosity characteristics of the resin that is the film material, temperature, air gap, pulling speed, discharge pressure, and the like. Therefore, it is very difficult for an expert to obtain a film having a desired product width.

In the present invention, first, the film width L is set as the final product width in the microcomputer, and a factor that determines the neck-in amount is input from the sensor unit 22 to calculate the neck-in amounts a and b. From the calculated neck-in amounts a and b and the film width L, the microcomputer calculates lengths [lip opening lengths] A and B equal to half the opening length D using the following formula.

A = [L / 2] + a, B = [L / 2] + b Returning to FIG. 1, the illustrated film width control device has an encoder 16, a proximity switch 17, and an operation button box as in the conventional case. 18 are provided, and the encoder 16, the proximity switch 17, and the operation button box 18 are connected to the sequencer 19. On the other hand, the motor 12 that drives the deckle 11 is coupled to the sequencer 19 via the electromagnetic switch 21.

Further, the control device shown in this example is provided with a sensor unit 22 that monitors a factor that affects the neck-in amount, and the detection values of these sensor units 22 are input to the microcomputer 25. The sensor unit 22 includes not only sensor elements that detect the viscosity characteristics of resin, temperature, air gap, pulling speed, and discharge pressure, but also a position sensor that detects the position of the deckle 11.

While the microcomputer 25 is connected to the sequencer 19, it is also connected to a display device 26 such as a CRT, a keyboard 27, and a storage device 28. This sequencer 19 receives the setting signal from the microcomputer 25 and
Has the function of moving the to a specified position.

The operation of the film width control device of FIG. 1 will be described with reference to FIG. When the operation starts, the first step
Move to S ₁ . The microcomputer 25 includes a film width setting unit 25a, to the setting unit 25a, in a first step S _1, the product width L is set from the keyboard 27. In the first step S ₁ , the detected value from the sensor unit 22 is given to the neck-in amount calculation unit 25b, and the neck-in amounts a and b (second
Figure) is calculated. In the second step S ₂ , the positioning amount calculator 25c calculates the opening length D of the deckle 11, that is, the lip opening lengths A and B from the neck-in amounts a and b and the product width L as the positioning amount, This positioning amount is output to a position control controller (not shown) in the microcomputer 25. Sequencer 19 for lip opening length A and B
The sequencer 19 automatically moves the deckle 11 by an amount corresponding to the lip opening lengths A and B (3rd
Steps). Regarding the neck-in amounts a and b, the product width L, and the lip opening lengths A and B at this time, the position control controller stores the job numbers and is connected to them through the film width setting unit 25a. The data is stored in the device 28 (fourth step S ₄ ). continue,
In the fifth step S ₅ , the position controller of the microcomputer 25 monitors the output from the encoder 16 by the sensor unit 22 and obtains this by passing through the neck-in amount calculation unit 25b, thereby obtaining the motor 12 and the disk.
The movement amount of 11, that is, the position data is detected. Specifically, it is determined whether the position data needs to be changed, and if the result of the determination is that the position data need not be changed, the process ends. If the position data needs to be changed, the process returns to the first step S ₁ .

In the above embodiment, the case where the neck-in amounts a and b are automatically calculated in the microcomputer 25 using the detection value from the sensor unit 22 has been described. Further, in the present invention, in addition to the detection value (factor) from the sensor unit 22, for example, the correction value of the neck-in amounts a and b is input by the operator through the keyboard 25 (in FIG. It may be configured such that the neck-in amounts a and b are automatically calculated by inputting (not shown) and using this together with the factor.

In the case of the illustrated embodiment, since the display device 26 is provided, the calculated value (set value) and the current value can be displayed. This configuration allows easy alignment when changing the product width.

[Effects of the Invention] In the present invention, the product width and neck-in amount can be set by the microcomputer, and the position of the deckle can be adjusted to a desired product width. Further, when the product is repeatedly manufactured, since the data stored in the storage device can be used, it is possible to prevent the product width from being varied due to individual differences. Further, since it is possible to constantly supply the optimum amount of resin, there is an advantage that the loss of resin is reduced.

[Brief description of drawings]

FIG. 1 is a block diagram showing a film width control device according to an embodiment of the present invention in association with a T die, FIG. 2 is a diagram for explaining the principle of the present invention, and FIG. 3 is FIG. 3 is a flowchart for explaining the operation of the film width control device of FIG. Explanation of symbols 10: T-die, 11: Dickel, 12: Motor, 13: Film, 16: Encoder, 17: Proximity switch, 18: Operation button box, 19: Sequencer, 22: Sensor section, 25: Microcomputer, 26 : Display device, 27: Keyboard, 28: Storage device.

Claims (1)

[Claims] 1. A film width control device for a film processing machine using a T-die controlled by Dickel, and a means for setting a predetermined film width, and at least a film for affecting a neck-in amount. A sensor section for monitoring each factor and the position of the deckle regarding the material and the film processing machine, a means for obtaining a neck-in amount according to the film width based on each factor from the sensor section, the film width and the neck-in A film width, which comprises means for calculating a positioning amount of the deckle from the amount, and means for automatically controlling the deckle based on the positioning amount of the deckle and the position of the deckle. Control device.