JPS5943572B2 - Temperature control method for heating fluid during crimp processing - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for controlling the temperature of a heating fluid during crimping.

One of the methods for crimping synthetic fiber yarn is to use a fluid injection nozzle (hereinafter referred to as "
The yarn is supplied to the yarn running through the nozzle and is injected at high speed from fluid injection holes such as pores and slits, and the generated fluid turbulence is used to plasticize the yarn.
There is a method of opening the fibers and further crimping them to form appropriate entanglements and loops.

Another method is to provide a collision wall (such as a wire mesh) with suitable air permeability near the nozzle outlet, and buckle and deform the yarn by collision with the heated high-speed fluid supplied to the nozzle to perform the crimping process. There is also.

In these crimping methods, the temperature of the heating fluid supplied to the nozzle has a large effect on the crimping performance of the yarn, so it is necessary to control the fluid temperature so that the fluid temperature is always constant. There is.

However, control of fluid temperature has posed many challenges, particularly during start-up of the crimping process.

For example, as shown in Fig. 1, in a conventional crimping machine,
The heater 1 includes a sheathed heater 3 around a fluid supply pipe 20.
It has a structure in which, for example, an aluminum block 4 is cast, and the entire body is further covered with a heat insulator 5.

The piping 2 is provided with a fluid supply valve 6 on the outlet side of the heater 1, and further communicates with the fluid chamber 8 around the fluid injection nozzle 70.

Further, the nozzle 7 is provided with a thread guide hole 9 and fluid injection holes 10 and 10' communicating with the fluid chamber 8.

In such a device, as a method of controlling the temperature of the fluid, the temperature detection end P1 detects the temperature of the fluid in the fluid chamber 8, feeds back the output to the temperature controller C, and controls the input voltage to the heater 1, for example. I do.

In such a device, in order to pass the thread through the thread guide hole 9 of the nozzle 7 when starting up the crimping process, it is necessary to pass an appropriate thread threading tool (not shown) made of a thin wire or the like in advance. For this work, the valve 6 must be closed and the supply of fluid to the nozzle 7 must be stopped.

After that, after hooking the thread to the tip of this threading tool and threading it through, the valve 6 is opened again to supply fluid, but normally,
During this time, the closing time of the valve 6 is usually about 30 seconds to 2 minutes.

However, the temperature detection end P1 that controls the heater 1
When the valve 6 is closed, the temperature inside the fluid chamber 8, which is not supplied with fluid, is detected, and since this temperature is lower than the steady state, the input voltage to the heater 1 increases due to the operation of the controller C. However, the temperature of the heater 1 itself increases.

That is, as illustrated in the relationship between fluid temperature and time in FIG. 3, normally the fluid temperature θN in the fluid chamber 8 is 2.
00℃, the surface temperature θH of the pipe 20 in the soil of the heater is 38
When the temperature is 0°C, when the valve 6 is closed at time T1, the temperature of the fluid chamber 8 gradually decreases, and the temperature drops to around 50°C in 30 seconds to 2 minutes between T1 and T2 until the valve 6 is opened. .

On the other hand, the surface temperature θH of the pipe 20 in the heater 1 is about 350° C. in a steady state, but when the valve 6 is closed, it begins to rise due to the above-mentioned reason and reaches about 470° C. by the time the valve 6 is opened again.

Since the pipe temperature θH becomes abnormally high in this way, even if the valve 6 is opened for a time T2 °C and the fluid supply is restarted, the temperature does not immediately return to steady state, and from the time T2 when the valve 6 is opened, the temperature is almost constant. It usually takes 5 to 10 minutes to reach a constant T3, which is extremely inefficient.

Based on these points, the inventor has made extensive studies and has found that
This has led to the present invention.

That is, in the present invention, when the fluid heated by the heater is supplied to the fluid jet nozzle to crimp the yarn, the temperature of the fluid in the heated fluid jet nozzle is changed during the crimping process, and when the crimping process is stopped. This is a method for controlling the temperature of a heating fluid in a crimp process, characterized in that the temperature of a heating fluid in a heater is controlled in accordance with each detected signal.

Hereinafter, the present invention will be explained in detail using the drawings.

FIG. 2 is a schematic diagram of a crimping apparatus according to an embodiment of the present invention, and FIG. 4 is a diagram showing the relationship between fluid temperature and time.

In FIG. 2, 21 is a heater, 22 is a pipe 23 is a sheathed heater, 24 is an aluminum block, 25 is a heat insulator, 26
is a valve, 27 is a fluid injection nozzle, 28 is a fluid chamber, 29 is a thread guide hole, 30.30' is a fluid injection hole, Pl,
P2 is the detection end, C1 and C2 are the controllers, Sl and S2
is a switch.

In addition, in FIG. 4, θN is the piping 220 inside the heater 21.
The surface temperature, θN, is the fluid temperature within the fluid chamber 28.

Hereinafter, referring to FIG. 2, the fluid temperature θN is detected in the fluid chamber 28 provided outside the nozzle 1 (consisting of the fluid chamber 28, the thread guide hole 29, and the injection hole 30° 30').

A first detection end P1, a first temperature control C1 that controls input to the heater 21 (consisting of a sheathed heater 23, an aluminum block 24, and a heat insulator 25) based on this signal, and a surface of the piping 220 in the heater λ1. A second detection end P2 that detects the temperature θH (approximately equal to the fluid temperature in the pipe 22)
and a second controller that controls the input to the heater 21 based on this signal.
For example, when the valve 26 is closed, the switch S1 is turned off by a limit switch and the switch S2 is turned on, and the second detection end P2 and the second temperature controller are closed. C2
, the surface temperature θH of the pipe 220 inside the heater 21 is controlled.

Next, when the valve 26 is opened, switch S1 is automatically turned on, switch S2 is turned off, and the first detection end P1 is turned on, contrary to the above.
and the fluid chamber 2 at the first temperature controller C1.
The temperature θN within 8 is controlled.

As a result, as shown in FIG.
At the same time as the valve 26 is closed, the control of the heater 21 is switched from the first controller C1 to the second controller C2, so the surface temperature θH of the piping inside the heater 1 remains constant even when the valve 26 is closed (T1 to T2). constant.

Next, when the valve 26 is opened, fluid begins to be supplied to the nozzle 27 and the temperature θN in the fluid chamber 28 gradually rises.

At this time, the second controller C2 is switched to the first controller C1, and although the temperature of the heater U slightly increases, it returns to normal in a relatively short time.

That is, from the time the valve 26 is opened until it becomes steady (T2~
T3) is about 2 minutes.

In addition, the explanation of the present invention is based on air of 6 kg 1 crlG as the fluid, heater capacity 4'w, and flow rate 20 ONl/yni.
The explanation is given using the case of n as an example.

As described in detail above, according to the present invention, the number of defective yarns is greatly reduced after the yarn is threaded until the temperature of the nozzle becomes constant.

Furthermore, there is no abnormal rise in temperature within the heater, and the life of the heater can be significantly extended.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of a conventional crimp device, FIG. 2 is a schematic diagram of a crimp device according to an embodiment of the present invention, and FIGS. 3 and 4 are relationship diagrams of fluid temperature and time. It is. In Figures 1 and 2, 1.21; heater, 7° angle;
Nozzle, P, Pl, P2; detection end, C, C1°C2s controller. In FIGS. 3 and 4, θH: surface temperature of piping within the heater, θN: fluid temperature within the fluid chamber.

Claims (1)

[Claims] 1. When supplying the fluid heated by the heater to the fluid injection nozzle to crimp the yarn, the temperature of the fluid in the heated fluid injection nozzle is controlled during the crimping process, and the temperature in the heater is controlled while the crimping process is stopped. A method for controlling the temperature of a heating fluid in crimping, characterized in that the temperature of the heating fluid is controlled according to each detected signal.