JPS5817298B2 - Filament yarn twisting number control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a heating number control device for filament yarn, and more specifically, a bobbin wound with filament yarn is rotatably attached to a reel, and while rotating the bobbin, a heating speed control device is applied. The present invention relates to a heating number control device in a heating device that heats by drawing out a filament yarn.

Conventionally, the so-called creel heating method, in which the bobbin is rotatably attached to a reel and heated by drawing out the filament yarn in the axial direction of the bobbin while rotating the bobbin, is a popular method for heating filament yarn wound around a bobbin. Are known.

In the case of creel heating, the heating number is determined by the sum or difference between the number of forced twists determined by (rotational speed of the creel/yarn drawing speed) and the number of untwisted twists.

The number of untwisted twists changes in inverse proportion to the diameter of the yarn layer on the bobbin, so if the number of forced twists is kept constant, the number of untwisted twists will vary between when the diameter of the yarn layer is large immediately after the start and when the diameter of the yarn layer is small before completion. In this case, the total heating number will fluctuate, but the fluctuation in the untwisting number will be about 5 T/m at most, so if the desired heating number is large (for example, 200 to 100 /m) was not particularly problematic.

However, when the desired heating number is small, such as 50 T/m or less, the ratio of the untwisting number becomes large, and the fluctuation in the heating number becomes impossible to ignore.

For example, when producing carbon fiber by firing acrylonitrile filament yarn, etc., heating is often performed to prevent the generation of fuzz, but the physical properties of carbon fiber obtained by heating a large number of times are It is desirable that the heating rate be as small as possible because the heating rate decreases and is easily damaged, and a heating rate of about 30 T/m or less is used.

If there is a fluctuation of as much as 5 T/m when the number of heating is small as described above, there is a drawback that unevenness is likely to occur in various treatments, and carbon fibers without twisting unevenness in subsequent steps are desired.

Therefore, the present inventors measured the change in the diameter of the bobbin yarn layer using a touch lever and a phototube, and considered increasing or decreasing the creel rotation speed accordingly, but the touch lever set causes fuzz, and the phototube type It was not practical due to the low accuracy caused by ballooning.

An object of the present invention is to provide a heating number control device that is accurate and free from defects such as generation of fuzz in the creel heating of filament yarn as described above, and in particular, the heating number is small and fluctuations in the number of unraveled twists are prevented. It is an object of the present invention to provide an effective heating number control device capable of uniformly heating in cases where problems arise.

That is, the present invention provides a heating device in which a bobbin wound with filament yarn is rotatably attached to a reel, and the filament yarn is heated by being pulled out along the axial direction of the bobbin while rotating the bobbin. A throughput measuring device that calculates the throughput of the filament yarn subjected to heating, and an untwisting number calculator that calculates the untwisting number of the filament yarn according to the output signal of the throughput measuring device. , a creel rotation speed calculator that calculates the creel rotation speed for giving the required heating number in accordance with the output signal of the untwisting number calculator; DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An apparatus for controlling the heating number of filament yarns provided with a creel rotation speed controller for controlling the number of rotations The present invention will be specifically described below with reference to the drawings.

FIG. 1 is a system diagram showing an example of a heating device to which the present invention is applied. A filament yarn 2 wound around a bobbin 1 is attached to a creel 4 rotated by a variable speed motor 3, and is passed through a guide 5. It is pulled out by the drive station 6 and sent to the next process (not shown).

In this case, the total heating number is the number of forced twists (
It is determined by the sum or difference between the creel rotation speed/yarn drawing speed) and the number of untwisted twists, and the number of untwisted twists increases with the passage of time.

The relationship between the amount of filament yarn processed in the bobbin and the number of untwists is shown in Figure 2, for example, when the yarn layer diameter is 32G77
In the case of 1, untwisting of I T / m is applied, and as the processing progresses and the yarn layer diameter reaches 10.6 m, it becomes 3 'I' / m.
It takes m of untwisting.

Therefore, by successively measuring the untwisted number, subtracting or adding it from the desired heating number, and controlling the creel rotational speed using the value as the forced twisting number, a constant heating number can be obtained.

The feature of the present invention is that the number of untwisted twists is calculated from the throughput of the filament yarn, preferably from the number of rotations of the rollers of the drive station, thereby improving accuracy and eliminating the occurrence of fluff.

In FIG. 1, I is a throughput measuring device that calculates the throughput of the filament yarn 2 that has passed through the drive station 6. The basic unit is a processing length calculator 10 that calculates the processing length by subtracting the circumference of the roller 8.

The processing length calculator 10 is used as the output signal of the processing amount measuring device 7.
You may use the output signal as it is, but it is also possible to use the output signal of the processing weight calculator 11, which calculates the processing weight by multiplying the processing length by the weight of the unit length light, or to calculate the processing weight from the yarn weight of the bobbin at the start. It is also possible to use the output signal of the raw weight calculator 12 which is subtracted to calculate the raw weight.

The output signal of the processing amount measuring device 7 is then sent to the unraveling twist number calculator 13.
sent to.

The relationship between the amount of throughput and the number of untwists determined by calculation or testing in advance is programmed into the unraveling twist number calculator 13, and the untwisting number calculator 13 is programmed with the relationship between the throughput and the untwisting number determined by calculation or testing in advance. The number of twists is calculated and sent to the next Creel rotation speed calculator 14 as an output signal.

The creel rotation speed calculator 14 includes a forced twist number calculator 15 that calculates a forced twist number by subtracting or adding an untwisted number signal from a desired applied twist number signal set in advance, and a forced twist number calculator The creel rotation speed calculator 16 calculates the creel rotation speed by multiplying the output signal of 15 by the withdrawal speed.

The output signal of the creel rotation speed calculator 14 is sent to a creel rotation speed controller 17 that controls the rotation speed of the creel.

The creel rotational speed controller 17 controls the variable speed motor 3 to increase or decrease the number of forced twists, and maintains the desired heating number constant regardless of fluctuations in the number of untwisted twists.

According to the device of the present invention, compared to a touch lever set or a photoelectric type, the number of untwisted twists can be measured with much higher precision without generating fuzz, thereby making it possible to maintain a constant heating number.

゛ The device of the present invention is particularly effective when used in the carbonization process of acrylonitrile filament yarn, which is preferably heated at 30 T/m or less, when the number of heating is so small that fluctuations in the number of untwisted twists cannot be ignored. , it can be used when a uniform number of heating is required even when the number of heating is large.

[Brief explanation of the drawing]

FIG. 1 is a system diagram showing an example of the apparatus of the present invention, and FIG. 2 is a graph showing the relationship between the bobbin yarn layer diameter and the number of untwisted twists. 1...Bobbin, 2...Filament yarn, 4...°°° creel, 6...Drive station 7.70. . ...Processing measuring device, 13... - Unraveling twist number calculator, 14... Creel rotation speed calculator, 17...
-... Creel rotation speed controller.

Claims (1)

[Claims] 1. In a heating device that heats a bobbin wound with filament yarn by attaching it to a rotatable reel and pulling out the filament yarn along the axial direction of the bobbin while rotating the bobbin, the filament yarn is pulled out from the bobbin and used for heating. A throughput measuring device that calculates the throughput of the filament yarn to be processed, an unraveling twist number calculator that calculates the untwisting number of the filament yarn according to an output signal of the throughput measuring device, a creel rotation speed calculator that calculates the creel rotation speed for giving the required heating number in accordance with the output signal of the twist number calculator; and a creel rotation speed control that controls the creel rotation speed in accordance with the output signal of the creel rotation speed calculator. A filament yarn heating speed control device equipped with a creel rotation speed controller.