JPS6328143B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a yarn heat treatment apparatus for thermoplastic synthetic fibers, and more particularly, to an improvement of a yarn heat treatment apparatus in which a dry heat heating zone and a wet heat heating zone are combined.

In the production of synthetic fibers, for example, the process of drawing undrawn yarn or semi-drawn yarn, the process of crimping the yarn, or the process of performing false twisting at the same time as drawing using undrawn yarn or semi-drawn yarn. In the above, a heat treatment device is appropriately provided according to each processing device, and the yarn heat treatment device itself has been improved as the main body of the processing device has progressed.

This also applies to the false twisting processing method of synthetic fibers, which has a long history, and mainly due to the increase in yarn processing speed due to the increase in the speed of the false twisting mechanism, the yarn heat treatment speed used therein has also increased. Naturally, a structure with performance that can handle high speeds is required.

By the way, some spinner-type false-twisting devices have spinner rotation speeds of up to 1 million revolutions per minute, and on the other hand, the appearance of direct-twisting friction false-twisting types has also dramatically increased processing speeds. has been increasing.

For this reason, for example, in conventional processing machines that use only dry heat heaters such as hot plates, in order to provide sufficient heat treatment results commensurate with the increased speed, the dry heat section has to be made longer and the As a result, the height of the entire false-twisting device increases, resulting in problems in terms of thread threading operability and installation location.

On the other hand, attempts have been made to shorten the processing length by passing the false-twisted yarn through a so-called moist heat heater using pressurized steam, etc., to accelerate the temperature rise of the yarn by utilizing the condensation heat transfer coefficient. , it has been put to practical use in false twisting processing, and has achieved some degree of effectiveness.

However, in recent years, melt-spun synthetic fibers have not been stretched to provide sufficient orientation and crystallization, but instead are wound up in an unstretched or semi-stretched state, and then subjected to a false twisting machine for stretching and false twisting. In recent years, so-called simultaneous stretching and false twisting has become common.

When undrawn yarn or semi-drawn yarn is subjected to wet heat setting, the yarn, which is not sufficiently oriented and crystallized, comes into contact with high-temperature, high-pressure steam, even if only momentarily, resulting in excessive thermal crystallization. A decrease in the strength of the processed yarn, which is thought to be caused by the presence of water molecules, was observed, as well as the occurrence of fuzz in the processed yarn.

In order to eliminate these conventional drawbacks, we have developed a method that reduces the strength of processed yarns by combining a dry heat heater and a wet heat heater, especially when drawing and false twisting are performed using undrawn or semi-drawn yarns. less, and
There is a drawing false twisting machine shown in FIG. 1 that uses a yarn heater with little steam leakage.

Therefore, the yarn heat treatment apparatus according to the present invention provides a new configuration of a yarn heater such as that used in the drawing false twisting machine shown in FIG. 1 above, for example. The gist is that.

In a yarn heat treatment apparatus consisting of a combination of a dry heat heating zone and a wet heat heating zone, the pressurized steam supplied as a heating medium for the yarn in the wet heat heating zone is extracted from the wet heat heating zone; A yarn heat treatment apparatus characterized in that the yarn is discharged after being used as a heating medium for a heating element of the dry heat type heating zone.

Hereinafter, the present invention will be explained in detail based on Examples.

FIG. 1 is a schematic diagram schematically showing the entire false twisting apparatus incorporating the yarn heat treatment apparatus according to the present invention. Supply yarn package 1, yarn supply roller 2, dry heat heater 3', wet heat heater 3'', cooling device 4, false twisting mechanism 5, yarn take-up roller 6, winding mechanism 7
are arranged along the running direction of the yarn 8.

In the above device, the yarn heat treatment device according to the present invention, that is, the dry heat heater 3' and the wet heat heater 3'' are installed in close proximity in series between the yarn supply roller 2 and the cooling device 4. The dry heat heater 3' is configured to heat the yarn 8 to a temperature above the glass transition point and below the melting point, and after drawing, the wet heat heater 3'' imparts a heat set to the yarn 8. The length of the dry heat heater 3' along the yarn may be long enough to heat the undrawn or semi-drawn yarn in a false-twisted state to a temperature above the glass transition point and below the melting point. . Moreover, as for the structure of the dry heat heater, it is most effective to heat the yarn by bringing it into contact with a hot plate or a heating rod-like body to raise the temperature. The feature of the apparatus according to the present invention having the above configuration is that in a yarn heater consisting of a combination of a dry heat heater and a wet heat heater, the pressurized steam used in the wet heat heater is used as the heat source of the dry heat heater. It is configured so that it is used in a circular manner.

The present invention will be described in more detail below with reference to FIGS. 2 and 3, focusing on this point.

FIG. 2 is an enlarged partially cutaway front view of the yarn heater according to the present invention in the apparatus shown in FIG. 1, that is, the dry heat heater 3' and the moist heat heater 3''. The figure is a side view taken along the line A-A in FIG. This yarn heater is configured in combination with a moist heat heater 3'' that is also filled with high-temperature pressurized steam and runs the yarn in the atmosphere. Pressurized steam for moist heat treatment is first supplied to the moist heat heater 3''. Then, the pressurized steam used in the moist heat heater 3'' is then supplied to the dry heat heater 3' to serve as a heat source for the dry heat heater. It is characterized in that a plurality of spindles are integrated as one operation unit, and operations such as supplying and stopping steam are performed for each operation unit. The structure and operation will be described in more detail. The dry heat heater 3' has grooves 9 on the spliced surface to guide the yarn and an appropriate curvature to improve heat transfer from the spliced surface, and its back surface is closed at the top and bottom to seal the pressurized steam. The pressurized steam that has undergone heat treatment in a moist heat heater 39 (described below) passes through a main supply pipe 10 and a supply pipe 11, and is then sent from a supply branch pipe 12 to a dry heat heater 3. ’. The return steam is passed from the return branch pipe 13 to the return pipe 14, and is collected for a plurality of spindles and sent to the main return pipe 15.
I'm leaving. A lid 16 is attached to the front to prevent heat loss and can be opened and closed using a hinge 17.
The dry heat heater 3' is supported by the insulation block 1 from the back side.
It is attached to the outer plate of the heater with bolts via 8. In addition, a thread guide 1 is installed at the entrance and exit of the suction plate.
9 and 20 are provided.

The moist heat heater 3″ is a cylindrical moist heat heater main body 39
Pressurized steam is supplied from the main supply pipe 21 through the supply pipe 22 and from the supply branch pipe 23 with a structure equipped with sealing devices 38' and 38'' having yarn passages with a cross-sectional area slightly larger than the passing yarn on the inlet and outlet sides. Moist heat heater body 3
9. Supply inside. The steam that has completed the heat treatment on the traveling yarn is returned to the branch pipe 24 and the return pipe 25.
The steam then exits from the main return pipe 26 through the main return pipe 26, and then flows into the main supply pipe 10 of the dry heat heater 3' as supply steam to the dry heat heater 3'. Similar to the dry heat heater 3', the wet heat heater 3'' is supported by bolts attached to the outer panel from the back side via a heat insulating block 27.

The gap between the outer panel and the outer panel is filled with a vapor insulating material 28 such as glass wool in order to minimize heat radiation loss. A pressure gauge 37 for monitoring is provided at the end of the supply pipe 11 of the dry heat heater 3' and the supply pipe 22 of the wet heat heater 3''.

Next, the piping system for each operation unit will be explained. The pipe connected to the outside (not shown) is the steam supply pipe 2.
9, a blotting pipe 30, and pipes 31 and 32 connected to a drain discharge trap. The steam supply pipe 29 has a three-way valve 33 before entering the moist heat heater 3'', and when supplying, stopping, or restarting threading, the operation of blowing out the steam filling the moist heat heater 3'' can be selected by switching the valve. Manipulate. As mentioned above, the steam that has completed the work of heating the yarn in the wet heat heater 3'' exits from the lower main return pipe 26, the drain is supplied to the trap side, and the steam is supplied to the dry heat heater 3'. Pipe line A check valve 34 and a pressure regulating valve 35 are provided in the middle.The check valve operates the three-way valve 33 when re-threading, and the wet heat heater 3''
This is to prevent the steam inside the dry heat heater 3' from cooling down when the steam inside the dry heat heater 3' is released, and the pressure regulating valve 35 controls the steam pressure supplied to the dry heat heater 3'. It is equipped with a function to control the steam pressure at the outlet of the wet heat heater 3'' within a range below.The check valve 34 and the pressure adjustment valve 35 are not necessarily required.Dry heat heating The steam that has completed its work in the vessel 3' becomes drain and is discharged by the trap through a drain discharge pipe 32 connected to a discharge trap (not shown).A three-way valve 36 is provided in the middle of the pipe, and one It is connected to the blow piping 30 described above.This is done by switching the three-way valve 36 to connect the blow piping 30 during startup and during a flushing operation to discharge condensate and foreign matter remaining in the heater. This is because this yarn heat treatment machine uses pressurized steam for both the dry heat heater and the wet heat heater, so it does not require electricity supply and is inexpensive in terms of the total equipment cost including temperature control. It is advantageous in terms of heat utilization as the steam used for heating is used for dry heat.Furthermore, since multiple spindles are configured as an operation unit, not only operation but also equipment costs such as valves are low, and heat radiation loss is reduced. It has many advantages such as less

On the other hand, when the steam used for dry heat heating is used for wet heat heating, the humidity is high and the quality of the steam is reduced, which directly comes into contact with the yarn, adversely affecting the physical properties of the processed yarn, and causing weight loss. This tends to increase the variation between heating times, so it is still more preferable to circulate the steam from wet heat heating to dry heat heating. Note that if pressurized steam is supplied from the same source to both the dry heat and wet heat heaters, there will be some waste in terms of energy usage.

4 and 5 show examples in which the dry heat heater 3' of FIGS. 2 and 3 is replaced with a heating rod-shaped body 40,
The heating rod-shaped body 40 is made of a pipe, and is meandered several times to compensate for the welding distance. 1 if the temperature rise is sufficient
It may be in the form of a straight tube, or a guide may be used to give it a wrapping angle in order to increase the length of contact with the heating rod-shaped body 40. This embodiment has the advantage that the dry heat heater can be made inexpensive.

As described above, the yarn heat treatment device according to the present invention is particularly useful when used in the yarn heating section of a simultaneous drawing and false twisting device, for example, as shown in FIG. , significant reduction in operating costs through effective energy use, and
It is cheaper in terms of total equipment, and when configured with multiple spindles as operating units, it has many advantages such as improved operability, lower equipment costs for valves, etc., and less heat loss. have

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of a drawing and simultaneous false twisting processing apparatus incorporating a yarn heat treatment apparatus according to the present invention. Second
The figure shows an embodiment of the present invention, and is an enlarged view of the area around the yarn heater in FIG. 1. Figure 3 is the second
It is a sectional view taken along the line A-A in the figure. FIG. 4 is an explanatory diagram of another embodiment according to the present invention, and FIG.
It is a sectional view taken along the line BB in the figure. 3′: Dry heat heater, 3″: Moist heat heater, 10: Main supply pipe, 11: Supply pipe, 12: Supply branch pipe, 1
3: Return branch pipe, 14: Return pipe, 15: Main return pipe, 21: Main supply pipe, 22: Supply pipe, 23: Supply branch pipe, 24: Return branch pipe, 25: Return pipe, 2
6: Main return pipe, 29: Steam supply pipe, 30: Blow pipe, 31: Drain discharge pipe, 32: Drain discharge pipe, 33, 36: Three-way valve, 34: Check valve, 35: Pressure control valve , 37: Pressure gauge, 38',
38″: Sealing device, 39: Moist heat heater body, 4
0: Heating rod.

Claims (1)

[Claims] 1. In a yarn heat treatment device consisting of a combination of a dry heat heating zone and a wet heat heating zone, pressurized steam supplied as a heating medium for the yarn in the wet heat heating zone is extracted from the wet heat heating zone, A yarn heat treatment apparatus characterized in that this is used as a heating medium for a heating element of the dry heat type heating zone and then discharged.