JPS60181310A - Apparatus for heat-treating yarn - Google Patents

Abstract

PURPOSE:To distribute hot air to the respective heating cylinders in air streams of equal flow rate, by means of fixed restricted parts such as orifices of the same diameter provided at the hot air blowing inlet corresponding to the respective heating cylinders. CONSTITUTION:An apparatus for heat-treating yarns capable of passing hot air distributed in the respective hot air blowing inlets 12 through orifices 15-1, 15-2, 15-3 and 15-4, restricting the holes of the orifices to small holes to increase the ratio of differential pressure before and after the orifices to the pressure loss of the whole hot air paths from the hot air supply source to the heating cylinders 10, and distributing the hot air equally to the respective hot air blowing inlets 12 through the respective orifices set at the same restricted diameter at the same position.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a yarn heat treatment apparatus used for direct spinning and drawing in which spinning, drawing, heating, and winding are performed in one step. More specifically, a plurality of yarns are each surrounded by a heating cylinder, and hot air from one heat source is applied to each heating cylinder at a uniform tl! This invention relates to a heat treatment device for yarn that can be distributed and blown at equal flow rates at different temperatures.

BACKGROUND OF THE INVENTION In recent years, a so-called direct spinning and drawing method, in which a spinning process and a drawing process are made continuous, has been put into practical use for the purpose of improving productivity. This direct spinning/drawing method includes (1) a method in which the spun yarn from the spinneret is stretched several times between rolls to impart orientation to the yarn (for example, Japanese Patent Application Laid-Open No. 58-36211); (2) There is a method in which the spun yarn from the spinneret is brought into contact with a bottle and stretched under a tension gradient or temperature gradient to impart orientation to the yarn.

In general, if a rotating body is provided as in method (1), it becomes an expensive device, and among methods (2) that apply a tension gradient, methods that utilize contact friction with solids or liquids do not cause fuzz or single yarn breakage. Due to problems such as generation of heat, the use of non-contact heating devices has begun to be considered. The present invention also relates to a non-contact type heat treatment apparatus using hot air as a treatment fluid.

In a heat treatment apparatus applied to such a direct spinning/drawing method, it is advantageous to use one heating cylinder for one yarn due to quality issues of the yarn. A known example of using a heating cylinder for each of a plurality of threads is disclosed in Japanese Patent Application Laid-open No. 5
There is No. 2-118030. However, in this proposal, in order to blow the same amount of hot air at a uniform temperature into each heating cylinder when using multiple threads, it is necessary to provide a valve in each heating cylinder and finely adjust the flow rate of each. Therefore, a large number of valves are installed, resulting in a large device, and it is very difficult to properly finely adjust each valve.

Furthermore, if it becomes necessary to change the flow rate due to changes in conditions, etc., this becomes a time-consuming and complicated task.

Further, as a similar technique, there is Japanese Patent Application Laid-Open No. 48-27014. In this proposal, the processing fluid is kept warm by surrounding it in two or three layers with another heat-insulating fluid so that the state of the high-temperature gas supplied to the heating cylinder of each yarn is uniform. Needless to say, this results in complicated and expensive piping equipment.

Furthermore, even if the temperature of the processing fluid blown into each heating cylinder becomes uniform, the flow rate does not necessarily become uniform.

Normally, the closer the process fluid is to the supply side, the higher the flow rate to the heating cylinder is, and the further away from the supply side, the smaller the flow rate is.

In this way, with the conventional technology, it is difficult to supply hot air at the same flow rate to each heating cylinder, or even if it is possible to adjust the flow rate to the same flow rate, the adjustment and the work of changing the flow rate due to changing conditions are complicated. As a result, the heat treatment of each yarn became uneven. If the heat treatment is not performed uniformly, a problem arises in that yarns with poor homogeneity and level dyeing properties are likely to be formed.

Purpose of the Invention In order to solve these problems, the present invention has developed a yarn that can easily distribute hot air at equal flow rates to each heating tube and that can easily change the flow layer when changing conditions. The purpose of the present invention is to provide a heat treatment apparatus for the following purposes.

Structure of the Invention The yarn heat treatment apparatus of the present invention, which meets this objective, surrounds a plurality of yarns melt-spun using a spinneret with a heating tube provided corresponding to each yarn, and heats the yarn with hot air. In a yarn heat treatment apparatus, a path of hot air sent from a supply source is branched in correspondence with the number of heating cylinders, and hot air is supplied into each heating cylinder through each hot air blowing port corresponding to each heating cylinder, Each of the hot air blowing ports is provided with a fixed throttle having the same diameter, for example, an orifice.

Effect of the Invention When the hot air sent from the hot air supply source is distributed and supplied to each heating cylinder, each flow rate of the distributed hot air depends on the pressure loss of each hot air passage after the branch point. In the present invention, an orifice is provided in each of the branched hot air passages, that is, each hot air inlet, so a larger pressure difference is generated before and after the orifice than in other passage parts. Therefore, the flow rate of hot air flowing through each hot air passage branched corresponding to each heating tube including the hot air blowing port is substantially determined by the differential pressure at the orifice, that is, the aperture diameter of the orifice. Since each hot air inlet is provided with an orifice of the same diameter, the flow rate determined by the orifice is set to the same flow rate, and each heating cylinder is provided with an orifice of the same diameter, without making fine adjustments as in the past. The same flow rate of hot air is supplied.

Furthermore, since the hot air is distributed from one hot air supply source, the hot air of the same temperature and flow rate is uniformly distributed to each heating cylinder.

In addition, the flow rate passing through an orifice is determined by the differential pressure before and after the orifice, but if the hot air passages after the orifice have the same shape, the flow rate at each hot air outlet can be made uniform by simply changing the pressure upstream of the orifice. It is easily adjusted while maintaining its properties.

Effects of the Invention Therefore, according to the present invention, by providing orifices with the same diameter, it is possible to distribute hot air at the same temperature and at the same flow rate to each heating cylinder. It is possible to uniformly heat-treat the yarn to obtain yarn with excellent homogeneity and level dyeing properties, and by changing the hot air pressure before branching on the upstream side of the orifice, the flow rate can be set easily to accommodate changes in conditions. , can be adjusted, and productivity can be improved.

EXAMPLES Below, preferred examples of the yarn heat treatment apparatus of the present invention will be described with reference to the drawings.

1 to 4 show a yarn heat treatment apparatus according to an embodiment of the present invention.

FIG. 1 shows an example of the arrangement of the heat treatment apparatus of the present invention,
Spinneret 2 for melt-spinning yarn 1, chimney 3, thread hook 411
4. The heat treatment device 9 is connected to the chimney 3 and threading machine 4 in the direct spinning/drawing device which is provided with the oil ring roller 5, the 10th roller 6, the 20th roller 7, and the winder 118. This shows the case where it is placed between.

This heat treatment device 9 is equipped with a heating cylinder 10 that surrounds the yarn 1 and heat-treats the yarn with hot air flowing inside, as shown in FIGS. 2 and 3 for four yarns. One heating tube 10 is provided for each yarn 1.

The upper part of the heating cylinder 10 is formed into a thermal m chamber 11 with an enlarged flow path area, which once diffuses the hot air and makes the flow uniform when hot air is supplied into the heating cylinder 10. Hot air chamber 11
A pipe-shaped hot air inlet 12 for supplying hot air to the hot air chamber 11 is inserted into the hot air chamber 11 . As shown in FIG. 3, the hot air passage is sent from a supply pipe 13 that supplies hot air after passing through a heat exchanger (not shown) to a header 14, and after the passage is divided into four by the header 14, each A hot air inlet 12 is connected to each heating tube 10 and hot air chamber 11.

In each hot air blowing port 12, an orifice 15 serving as a fixed throttle having the same diameter is provided. Each orifice 15-1, 15-2 provided in each hot air blowing port 12.
15-3 and 15-4 are arranged at the same position when viewed from the hot air flow direction of each hot air inlet 12. The orifice 15 is connected to the hot air inlet 1 as shown in an enlarged view in FIG.
It is made up of a disc-shaped body having an outer diameter that is the same as the inner diameter of 2, and a through hole 16 set to an appropriate aperture diameter is bored in its center. The orifice 15 is fitted into each hot air outlet 12 at a predetermined position within the hot air outlet 12 so that all the flowing hot air passes through the i-hole 16. The orifice 15 may be provided at a position in the middle of the hot air inlet 12 as shown in FIG. 3, or at a position branching from the header 14 to each hot air outlet 12.

In this embodiment, a pressure reducing valve 17 is provided in the supply pipe 13 at a position upstream of the orifice 15 and before branching into each hot air blowing port 12 .

Note that a heating medium-filled heater 20 having a heater 18 and a heating medium 19 is provided at the bottom of the heating cylinder 10 . Also,
From the downstream side of the pressure reducing valve 17, the heat treatment apparatus 9 is insulated over almost the entire surface with a heat insulating material 21.

In the yarn heat treatment apparatus configured as above,
The hot air sent from the hot air supply source is reduced in pressure to a predetermined value by the pressure reducing valve 17 from the supply pipe 13 and then sent to the header 14.
After being distributed to each hot air inlet 12 by the header 1'4, it is supplied from each hot air inlet 12 into each hot air chamber 11 and each heating cylinder 10.

The hot air distributed in each hot air blowing port 12 passes through the orifice 15-1.15-2.15-3.15-4, but since the through hole 16 is narrowed to a small diameter, the orifice 15 A large pressure difference is generated between the front and rear sides, that is, a large pressure difference that accounts for a large proportion of the pressure loss in the entire hot air passage from the hot air supply source to the heating cylinder 10. Therefore, the distribution ratio of hot air to each hot air blowing port 12 is determined by the pressure difference between each orifice 15. Each orifice 15-1.15-2.1
5-3 and 15-4 are set at the same position and have the same aperture diameter, so the hot air is evenly distributed to each hot air blowing port 12. Then, the hot air sent from one hot air supply source is distributed in equal amounts from the header 14, so each hot air chamber 11 and each heating cylinder 10 is supplied with the same amount of hot air at the same temperature. Ru.

The effect of providing such a refurbisher 15 is clearly shown from the following test training results. Table 1 shows that the inner diameter of the heating cylinder 10 is 15 va, the length is 11111 and the hot air blowing port 12.
In a heat treatment apparatus with an inner diameter of 12IllIIIl, when the orifice 15 with an aperture diameter of 2111111 is set to
The flow rate inside each heating cylinder 10 in the case where the conventional heating cylinder is not provided is shown.

Table 1 As is clear from the table, conventionally, the flow rate of hot air was large at the hot air inlet 12 located close to one position of the supply pipe 13, and was small at the hot air inlet 12 located further away, resulting in a large flow I. It varied. In the present invention, the orifice 15 completely equalizes the flow rate. This equalization effect is obtained by the differential pressure across the orifice 15 for a predetermined flow rate of hot air, that is, by the aperture radius of the orifice 15, but as a result of various tests, it has been found that the pressure on the upstream side of the orifice
If the pressure satisfies P > 0.25 kg, preferably P > 0.5 kg/c, the effect of equalizing the amount of i, which is not a problem in practice, can be achieved by 1q. This orifice 15
The upstream pressure is easily set by adjusting the pressure reducing valve 17.

As mentioned above, by providing the orifice 15 and maintaining the pressure on the upstream side of the orifice 15 above a certain value, a uniform flow rate of hot air is naturally supplied to each heating cylinder 10. In some cases, it is necessary to change the flow rate supplied to each. As mentioned above, this change
2. This can be easily done by simply adjusting the pressure reducing valve 17 while keeping the flow rate of each hot air supply uniform. Table 2 shows the relationship between the pressure adjusted by the pressure reducing valve 17 and the flow rate of hot air supplied to each hot air blowing port 12 when a heat treatment apparatus having the same shape as described above is used and the diameter of the orifice 15 is changed. .

Table 2 (Unit = β/min) In this way, for a certain orifice diameter, the pressure adjusted by the pressure reducing valve 17 and the hot air flow rate of each hot air blowing port 12 are related to a certain reproducible relationship. Therefore, there is no need to finely adjust the flow rate for each hot air inlet as in the prior art, and conditions can be easily changed by simply adjusting the pressure reducing valve 17 provided before the branch.

As is clear from the above description, according to this embodiment, by providing the orifice 15, hot air can be uniformly supplied at the same temperature and at the same flow rate to each heating element, and uniform heat treatment can be performed. The effect is that it is possible to obtain yarn with excellent homogeneity and level dyeing properties.

In addition, when changing conditions, the flow can be easily changed by simply operating the pressure reducing valve 17 while maintaining the uniform distribution performance of hot air, which greatly shortens the flow rate adjustment time and makes the work easier. It also has the effect of improving productivity by optimizing the system.

Furthermore, since the hot air is naturally evenly distributed by the orifice 15, there is no need to provide an adjustment position for each heating cylinder 10, which simplifies the overall structure of the device and makes it compact with less heat loss. It can be used as a device.

The present invention can be applied to a direct spinning and drawing method for thermoplastic polymers such as polyamide and polyester.
Further, the hot air as the fluid for heat treatment of the yarn may be not only air but also an inert gas containing nitrogen or the like.

[Brief explanation of drawings]

FIG. 1 is a front view showing an arrangement example of a yarn heat treatment apparatus according to an embodiment of the present invention, FIG. 2 is a longitudinal cross-sectional view of the yarn heat treatment apparatus shown in FIG. 1, and FIG. 4 is an enlarged sectional view of the orifice of the device shown in FIG. ... Heat treatment device 10 ... Heating tube 11 ... Hot air chamber 12 ... Hot air inlet 13 ... Supply pipe 14 ... ...Header 15.15-1.15-2. 15-3.15-4... Orifice 16 as a fixed throttle... Through hole 17... Pressure reducing valve

Claims (1)

[Claims] (1) A plurality of yarns melt-spun using a spinneret are surrounded by heating cylinders provided correspondingly to each yarn, and the passage of hot air sent from a hot air supply source is controlled by the number of heating cylinders. In the yarn heat treatment apparatus, hot air is supplied into each heating cylinder through hot air inlet ports corresponding to the respective heating cylinders, each of which has a fixed throttle having the same diameter. A yarn heat treatment device characterized by: