JPS6215262Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Technical Field> The present invention relates to an apparatus for supplying heated compressible fluid to a jet nozzle for crimping. More specifically, the present invention relates to a device for supplying a heated compressible fluid to a jet nozzle for crimping, which is used when thermoplastic synthetic fibers are crimped by jetting them together with a heated compressible fluid from a jet nozzle.

<Prior art> A method of crimping thermoplastic synthetic fibers by jetting them together with a heated compressible fluid from a jet nozzle is as follows:
Since the obtained crimped yarn has three-dimensional random crimps and has low stretchability and high bulkiness,
It is extremely convenient for carpet fae yarns, etc., and is widely used today.

In this so-called jetting process, the temperature of the fluid supplied to the jet nozzle has a great effect on the crimp performance and dyeability of the yarn, so it is necessary to control the fluid temperature with high precision.

JP-A-54-2449 and JP-A-54-120765 each propose a fluid temperature control method. With these proposals, it is certain that crimped yarns of more uniform quality than before can be obtained, but since the heated compressible fluid used has a small heat capacity, even when passing through carefully kept warm piping. Causes a large temperature drop. For example, when flowing superheated steam at 300℃ through a 40A gas pipe at 50Kg/hour,
Even if the asbestos is wrapped in a 5cm thick layer to keep it warm, the pipe 1
The temperature drop per meter reaches approximately 10°C. This temperature drop causes a buffer, and temperature control accuracy is not necessarily sufficient. Therefore, there is a need for a fluid supply device that can heat the heated compressible fluid very close to the jet nozzle. Conventionally, such heating of the fluid has been carried out by providing a sheathed heater within the tank, or by attaching a sheathed heater cast into an aluminum block around the piping. However, such a device inevitably becomes large in size, and as a result, it is not possible to heat the fluid close to the jet nozzle.

By the way, in systems where a sheathed heater is installed inside the tank, the tank must be installed outside the injection processing machine, and even if the injection processing machine is made as compact as possible, the distance from the tank to the jet nozzle must be within 5 m. It was virtually impossible to do so.

On the other hand, when piping is heated with an aluminum cast-in heater, it is possible to heat the fluid quite close to the jet nozzle, but even in this case, for example, when using a 20A gas pipe, the heat insulating material is The outer diameter of the pipe was as large as 160 mm, and the 1.5 m long pipe to the jet nozzle could not be heated. This is because the aluminum cast-in heater transfers heat to the fluid through the wall of the gas pipe, so a large-capacity heater must be used.

Based on these findings, the present inventor found that such drawbacks could be overcome by making the fluid supply piping itself to the jet nozzle into a compact heating device, and arrived at the present invention.

<Purpose of the invention> The object of the present invention is to provide a heating compressible fluid supply device that can precisely control the temperature of the heating compressible fluid supplied to a jet nozzle for crimping, has a compact structure, and is inexpensive. With the goal.

<Structure of the invention> The object of the invention is to provide a pipe heater whose one end is connected to a jet nozzle for crimping via a short pipe and the other end is connected to a compressible fluid supply source via a connecting pipe; a temperature controller that is configured to include a temperature detection end provided on the tube and a temperature setting device and that issues a signal when the temperature measured at the temperature detection end differs from the temperature set in advance on the temperature setting device; Achieved by a heated compressible fluid supply device to a jet nozzle for crimping thermoplastic synthetic fibers, which includes a voltage regulator that adjusts the voltage applied to the pipe heater in response to a signal from the temperature regulator. be done.

<Example> The present invention will be described in detail below with reference to the accompanying drawings showing one embodiment of the present invention.

FIG. 1 is a schematic diagram showing one embodiment of the present invention. As shown in FIG. 1, a yarn 1 is fed to a jet nozzle 3 by a feed roll 2 and a separator roll 2'. Jet nozzle 3
From the main piping 8 for supplying heated compressible fluid, through a branch pipe 9 and a pipe heater 10, a short pipe 11 equipped with a temperature detection end 13 connected to a temperature controller (TIC) 16 is supplied. Allows sexual fluids to enter. The pipe heater 10 has a branch pipe 9 and a short pipe 1 at flange parts 12 and 12', respectively.
1 is connected. The temperature of the heated compressible fluid introduced into the jet nozzle is controlled by a temperature controller (TIC).
If there is a bias between the temperature required for crimping, which is set in the temperature setting device in the temperature setting device 16, and the temperature detected by the temperature detection terminal 13, the silicon controlled rectifier (SCR) 15 is activated by an electric signal sent from the TIC. The primary side voltage of the transformer 14 is controlled, and the voltage flowing to the pipe heater 10 is adjusted and controlled. The temperature set in the temperature controller 16 as the temperature necessary for crimping is generally in the range of 260 to 330°C when spraying is performed at a speed of 1500 to 2500 m/min using nylon 66 multifilament. . However, this temperature varies depending on the type of material used and the processing speed, and ranges from 220 to 350 degrees Celsius.
Note that even when the temperature detection end temperature is higher than the set temperature, it is clear that the fluid temperature flowing into the pipe heater 10 must be lower than the set temperature in order to be able to adjust it quickly. . The yarn 1 and the fluid injected from the jet nozzle collide with the breathable movable collision wall 4, and are cooled by being blown with cold air by the cooling nozzle 5.
Although this cooling treatment is not necessarily essential, it is desirable in order to provide stronger crimp. Yarn 1 is
Furthermore, it is taken up from the air-permeable movable collision wall 4 by a take-up roll 6 and a separator roll 6', and wound into a winding machine 7 as a crimped yarn.

The present invention is based on the feed roll 2 to the winding machine 7 of an injection collision processing machine in which a heated compressible fluid supply device is used.
The structure related to yarn processing up to may be different from that shown in FIG. That is, the heated compressible fluid supply device according to the present invention can be used for any of various injection collision processing machines having known configurations, of which an extremely large number of proposals have been made.
Furthermore, the yarn 1 may be supplied in the form of melt spinning and direct drawing, a so-called spin draw textured method. It is generally preferable to use a heated roll as the feed roll 2 in order to obtain a good crimp ratio.

FIG. 2 is a sectional view of the flange portion 12 that connects the branch pipe 9 and the pipe heater 10. Flange portion 1 connecting pipe heater 10 and short pipe 11
2' is similarly constructed. As shown in Figure 2,
In the flange portion 12, a flange 16 and a flange 17 are fitted and fixed to the respective ends of the branch pipe 9 and the pipe heater 10. This flange 1
Branch pipe 9 and pipe heater 10 are connected by tightening bolts 19 and nuts with insulating gasket 18 between pipe 6 and flange 17. A wiring terminal 22 is provided on the flange 17 on the pipe heater 10 side. In this case, the branch pipe 9 and the pipe heater 10 side are connected to the bolt 1.
Bolt 19 to prevent energization through 9
An insulating gasket 21 is wrapped around it. Gaskets 18 and 21 used here are bulkers.
No. 1500 (trade name of a gasket made by Nippon Valqua, made mainly of asbestos) is more preferable.

In this invention, the heated compressible fluid used is
Air and superheated steam are more suitable in terms of manufacturing cost.
In particular, superheated steam is advantageous in terms of quality (no oxidative deterioration of the polymer).

In the present invention, a pipe heater is a conductive metal pipe that heats the fluid passing through it with the Joule heat generated by passing an electric current through it, and the heating element and the fluid are in direct contact with each other. The heat transfer is carried out by Therefore, heat transfer efficiency is high,
The device is extremely compact and has high control accuracy, making it ideal for controlling fluid temperature during injection processing.

Next, one example of a pipe heater will be described in more detail. Flowing 50 kg/hour of superheated steam at 250℃, 250 to 350
When controlling the outlet fluid temperature at a set temperature in the range of ℃, use SUS304 and 20ASCh40 piping, the applied voltage effective value is 10V or less, the heater current maximum effective value is 800A, and the maximum heater power is 8kw.
If so, the length of the pipe should be about 2 m. In this case, when changing the set value from a controlled state of 280°C to 290°C, the control state was entered within 1 minute. On the other hand, from 290℃
Even when lowering the set point to 280°C, the control state was entered within 1 minute.

With the conventional equipment that has an 8kW sheathed heater installed in the tank, or the type that covers the piping with a cast aluminum heater (also 8kW), it takes more than twice as long to change the same set value. I entered a state of control. Particularly in these cases, it took more time to lower the set value. This seems to be due to the fact that it takes time to lower the temperature of the residual heat from the tank, aluminum cast heater, etc.

As a temperature detection end, a thermocouple type is best.
Alumel-chromium, iron-constantan, etc. can be used.

For temperature control, it is preferable to use a phase angle control method to avoid temperature hunting or the like.

<Effects of the Invention> In the device of the present invention, even if the 20A gas pipe is wrapped with heat insulating material, the outer diameter is as small as 100mmφ, and the temperature detection end is installed very close to the jet nozzle, and the pipe heater and jet nozzle are connected very close to the jet nozzle. It is possible to heat the fluid up to a length of 30 cm (30 cm is sufficient for the short pipe connecting the can be increased. Furthermore, since the apparatus of the present invention uses a pipe heater, the apparatus can be made extremely compact.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing an injection collision processing machine using an embodiment of the heated compressible fluid supply device of the present invention, and FIG. 2 shows a connection between a branch pipe or a short pipe and a pipe heater. It is a sectional view of a flange part. 1... Yarn, 2... Feed roll, 3... Jet nozzle, 4... Breathable moving collision wall, 5...
Cooling nozzle, 6... Take-up roll, 7...
Winding machine, 8...Main piping for heating fluid supply, 9...Branch pipe, 10...Pipe heater, 11...Short pipe,
12, 12'...Flange part, 13...Temperature detection end, 14...Transformer, 15...Silicon controlled rectifier (SCR), 16, 17...Flange, 18,
21...Gasket, 19...Bolt, 20...
Nut, 22...Terminal for wiring.

Claims (1)

[Scope of utility model registration request] A pipe heater whose one end is connected to a jet nozzle for crimping via a short pipe and the other end is connected to a compressible fluid supply source via a connecting pipe, and a temperature detection end and temperature setting provided on the short pipe. a temperature controller that emits a signal when the temperature measured at the temperature detection end differs from the temperature set in advance on the temperature setting device; A heating compressible fluid supply device to a jet nozzle for crimping thermoplastic synthetic fibers, the device comprising a voltage regulator that adjusts the voltage applied to the pipe heater.