JPH0681264A - Method for controlling water content of sized yarn - Google Patents

Abstract

PURPOSE:To enable to constantly control the water content of a sized yarn so as not to cause the change in the physical properties of the sized yarn. CONSTITUTION:The temperatures of the cylinders 7a-7e of a sizing machine are controlled with the pressures of steam, and the steam is charged into the cylinders 7a-7e with the steam pressures corresponding to the drying temperatures of a sized yarn, thus stabilizing the temperatures of the cylinders 7a-7e. Since the pressures of the steam for the cylinders 7a-7e are automatically controlled with an automatic pressure-reducing valve 12 on the basis of the comparison results of the signals inputted from a water content-measuring device 8 with set valves, the set water content can always be obtained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for controlling the water content of sized yarn.

[0002]

2. Description of the Related Art In a conventional sizing machine, since the conductivity of water is much higher than that of fibers, the moisture content of a sizing yarn running during operation can be continuously measured electrically. However, there is known a method of controlling the water content of the sized yarn by controlling the operating speed according to the fluctuation. This method is a method of changing the rotation of the DC motor by interlocking the fluctuation of the moisture content sensed by the instrument with the DC generator from the measuring device, and adjusting the operating speed according to the variation of the moisture content. Although the method is effective for controlling the water content, the amount of sizing increases as the operating speed changes, and the physical properties of the sizing yarn (the amount of sizing, strength and elongation, shrinkage, etc.) However, there is a problem in that the quality and physical properties of the woven fabric are impaired.

Further, as a method of controlling the drying temperature to obtain a desired moisture content of the sized yarn, the temperature of the drying cylinder or the like is set in advance, and the solenoid valve is turned on / off depending on the measured temperature. Generally, a method of supplying / stopping steam and changing a set temperature when a yarn type or the like is changed and conditions need to be changed is commonly used. In this method, since the supply steam temperature is higher than the set temperature, the solenoid valve is repeatedly turned on and off repeatedly, and the actual temperature varies with respect to the set temperature. Similarly, the water content of the yarn is not stable.

[0004]

SUMMARY OF THE INVENTION The present invention is intended to solve such a problem, and it is an object of the present invention to keep the moisture content of the sized yarn constant so that the physical properties of the sized yarn do not change. It is intended.

[0005]

In order to solve this problem, the present invention provides a method of drying a sized yarn by moving the sized yarn while contacting the sized yarn with the surfaces of a plurality of stages of drying cylinders. In the above, a moisture content measuring device for contacting the sizing yarn that has passed through the last stage cylinder to measure the moisture content of the sizing yarn is provided, and an input signal from this moisture content measuring device and a preset moisture content setting value and And the steam pressure to the cylinder is determined based on the deviation, and the cylinder temperature is controlled to control the moisture content of the sized yarn.

The present invention will be described in detail below. First, a schematic configuration of the gluing machine will be described with reference to FIG. In the figure, 1 is a pre-dryer for pre-drying the warp yarns 2 that have passed through a sizing tank (not shown). In this pre-dryer 1, heat of steam passing through a steam pipe 3 and air sent by a fan 4 exchange heat. The heated warp yarns are dried as hot air while being guided by a plurality of rollers 5 and moving.

A main dryer 6 is provided with first to fifth cylinders 7a to 7e which rotate in synchronism with the feeding speed of the warp 2 for the main drying of the warp 2 preliminarily dried by the predryer 1. Further, steam is supplied to the inside of each of the cylinders 7a to 7e to heat each of the cylinders 7a to 7e so that the surface temperature becomes a required temperature.

Reference numeral 8 is provided with a moisture content detection roller 9 which comes into contact with the warp yarn 2 which has passed through the fifth cylinder 7e in the final stage.
It is a moisture content measuring device for measuring the moisture content of. FIG. 2 compares an input signal from the moisture content measuring device 8 with a preset moisture content setting value, and the cylinders 7a ...
A system flow for determining the steam pressure for 7e and controlling the cylinder temperature is shown, and the method of the present invention will be described below with reference to the drawings. First, adjust the moisture content to the controller [Yokogawa Electric Co., Ltd.].
UT-15 Digital indicating controller] 10 to set the moisture content. Moisture content measuring instrument [(existing) Wakasugi Electronic Measuring Instruments Mfg. T
R-10 dry tester] 8 to measure the moisture content of the warp yarn 2, and a current signal of 0 to 10 mA in the moisture content range of 3 to 9% is converted into 0 to 5 V with a resistance of 500 Ω and input to the controller 10. . Deviation between the input signal from the moisture content measuring instrument 8 and the set value is controlled by the regulator 10 from the pressure reducing valve controller [PC-COS automatic pressure control system manufactured by TLV Co., Ltd.].
Sent to 11. The pressure reducing valve controller 11 automatically determines the control pressure based on this deviation, and sends a control signal to the automatic pressure reducing valve 12. The automatic pressure reducing valve 12 controls so that the pressure of the pressure sensor 13 in the pipe becomes the set pressure of the pressure reducing valve controller 11. Drain accumulated in the pipe is forcibly discharged by a vacuum pump [CPV-2,2 vacuum pump manufactured by TLV Co., Ltd.] 14.

The cylinder 7 of the gluing machine is manufactured by the above method.
By controlling the temperature of a to 7e by the steam pressure,
The water content of the warp 2 can be kept constant. The control of the cylinder temperature as described above may be performed for all the cylinders or for some of the cylinders.

[0010]

According to the present invention, an input signal from a moisture content measuring device for contacting the glued yarn that has passed through the drying cylinder at the final stage and measuring the moisture percentage of the glued yarn, and a preset moisture percentage setting value. The steam pressure to be supplied to the cylinder is determined based on the difference between the above values, and the steam pressure is reduced to the steam pressure determined by the pressure reducing valve before being supplied to the cylinder, and then steam is supplied to the cylinder at the steam pressure corresponding to each drying temperature. As a result, the cylinder temperature becomes stable and the set moisture content can always be obtained.

[0011]

EXAMPLES Next, the present invention will be described in more detail by way of examples. The water content in the examples was measured by the following method. Moisture content measurement method A moisture content detection roller of a dry tester (type TR-10) manufactured by Wakasugi Denshi Keiki Seisakusho is attached to the position before the winding part of the sizing machine, and the moisture content detection value is measured by Yokogawa Electric ( Recording was continuously performed on a recorder (Type 3057) manufactured by K.K. Example 1 A total of 3600 warp yarns of English count 80 count cotton yarn were placed in a gluing machine (type: HC-5) manufactured by Kawamoto Machinery Co., Ltd., and the first, fourth, and fifth cylinders were placed in the first, fourth, and fifth cylinders as shown below. , A pressure reducing valve is used to send steam at a constant steam pressure, and the second and third cylinders are glued by controlling the steam pressure so that the moisture content of the sized yarn is 5.5% by the method shown in FIG. The rate was measured. Fig. 3 shows the fluctuation state of the moisture content of the sized yarn at this time.
Shown in.

Operating Conditions I Supply Steam Pressure 2 kg / cm ²
(Temperature 119 ° C.) First cylinder steam pressure 0.75 kg / cm ² Second and third cylinder steam pressure Automatic control according to FIG. 2 Fourth and fifth cylinder steam pressure 0.15 kg / cm ² Operating speed 35 yards / min. For comparison, the water content of the sizing yarn was measured under the following operating conditions G of the conventional sizing machine in which the temperature control of each cylinder is the on / off operation of the solenoid valve. The fluctuation state is shown in FIG.

Operating condition G Supply steam pressure 2 kg / cm ²
(Temperature 119 ° C.) 1st cylinder set temperature 115 ° C. 2nd and 3rd cylinder set temperature 110 ° C. 4th and 5th cylinder set temperature 110 ° C. Operating speed 35 yards / min As is apparent from FIGS. It can be seen that the sized yarn obtained by controlling the cylinder temperature by turning the valve on and off has a large variation in water content, whereas the sized yarn obtained by the method of the present invention has a very small variation.

[0014]

As described above, according to the present invention, the moisture content measuring device for contacting the glued yarn that has passed through the drying cylinder at the final stage to measure the moisture content of the glued yarn is provided. The moisture content of the sizing yarn is kept constant by comparing the input signal from and the preset moisture content and determining the steam pressure for each cylinder based on the deviation and controlling the cylinder temperature. It is possible to obtain a sized yarn with stable physical properties.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of a gluing machine according to the present invention.

FIG. 2 is a system flow diagram of a moisture content control method for sized yarn according to the present invention.

FIG. 3 is a graph showing the measurement results of the water content of the sized yarn obtained according to the present invention.

FIG. 4 is a graph showing the measurement results of the water content of the sized yarn obtained by the conventional example.

[Explanation of symbols]

 2 Warp 7a-7b Cylinder 8 Moisture content measuring device 9 Moisture content detecting roller 10 Regulator 11 Pressure reducing valve controller 12 Automatic pressure reducing valve 13 Pressure sensor 14 Vacuum pump

Claims (1)

[Claims] 1. A method for drying a glued yarn by moving the glued yarn while contacting the glued yarn on the surfaces of a plurality of stages of drying cylinders. Equipped with a moisture content measuring device for measuring the moisture content of the yarn, the input signal from this moisture content measuring device is compared with a preset moisture content setting value, and the steam pressure for the cylinder is determined by the deviation, A method for controlling the moisture content of a sized yarn, which comprises controlling the cylinder temperature.