JP3222396B2 - Heat treatment equipment for multiple yarns - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a so-called "direct spin drawing apparatus" in which a large number of spun multifilament yarn groups are once cooled to a glass transition temperature or lower, and then heated and drawn. The present invention relates to a heat treatment apparatus for use in the above.

[0002]

2. Description of the Related Art In recent years, for example, for the purpose of improving productivity, a group of yarn spun from a group of spinnerets is once cooled and solidified to a glass transition temperature or lower, and further heated in a non-contact state in a cylindrical heating tube. While pulling the group of yarns at high speed, a tensile stress is generated in the filament by friction with air,
Stretching and orientation are performed (hereinafter, such a method is sometimes referred to as "direct spinning and stretching method", and an apparatus for applying the method is sometimes referred to as "direct spinning and stretching apparatus").

In a direct spinning and drawing apparatus in which the above-mentioned spinning step and drawing step are continuous, as a device for heating a yarn, a cylindrical heating tube is filled with a high-temperature gas, and An apparatus for heat-treating a strip in a non-contact manner is generally used. For example, JP-A-62-69815, JP-A-62-69816, and JP-A-60-75609
And JP-A-60-75610, etc.
A method or a device has been proposed in which a yarn is drawn at a high speed such as 0 to 4000 and 5000 m / min to thereby obtain a highly oriented yarn.

[0004] However, when an attempt is made to produce a yarn having a large single fiber denier using such a heat treatment apparatus, the heating efficiency is lower than that of a yarn having a small single fiber denier. Become longer. For this reason,
There is a problem in that it is difficult to arrange the heat treatment apparatus as it is without changing the layout of the existing melt-spinning equipment, or it is difficult to thread the yarn through the heat treatment apparatus. Therefore, in order to avoid the above problem, it is conceivable to design the heat treatment apparatus compactly. However, in such a heat treatment apparatus designed compact, there is a problem that due to the accompanying airflow brought in by the yarn, the ambient temperature in the heating cylinder decreases, and a sufficient amount of heat cannot be applied to the yarn. .

Further, in the conventional tubular heat treatment apparatus, one tube (one heating cylinder) corresponds to each weight (each yarn) of the spun multifilament yarn group. Therefore, for example, in the case where the yarn breaks during operation or in the case of the yarn dropping / yarn receiving operation at the time of starting up the equipment, there is a problem that the operation must be performed for each spindle. In other words, in response to the increase in the yarn take-up speed, the yarn dropping into the heating cylinder at the start-up of the equipment and the subsequent yarn hooking work must be performed efficiently, and the yarn breakage processing at the time of yarn breakage is ensured. It is required to increase the productivity by reducing the loss time.

However, in the conventional thread dropping and thread receiving operation, a suction gun modified specifically for thread dropping is pressed against the lower part of the heating cylinder to drop the thread from the upper part of the heating cylinder, and after suctioning with the suction gun, Aspire provided under the heating tube
It is required to perform a work such as temporarily depositing the suctioned yarn in the container. For this reason, in the conventional work method, work by a large number of workers having workers arranged above and below the heating cylinder is essential. In addition, since it is necessary to perform the above-described operation for each of a plurality of yarn groups for each weight, this operation requires a great deal of labor and time. Also, in the thread breaking process when the yarn is cut for some reason, usually,
This is performed using a yarn breaker equipped with a converging arm, an aspirator, and a yarn cutter for converging a multifilament that has lost convergence due to yarn breakage. However, the conventional cylindrical heat treatment apparatus having a heating cylinder group corresponding to each of the weights has a problem that the distance between the weights is inevitably increased. In addition, there is a problem that the stroke length of the convergence arm is increased, the convergence of the yarn and the suction effect are deteriorated, and the yarn breakage processing cannot be performed reliably. Further, when the number of machines is plural, the amount of work becomes enormous, which is a very serious problem in improving productivity and work efficiency.

[0007]

SUMMARY OF THE INVENTION In view of the above-mentioned problems, the present invention is compact, and can easily perform a thread dropping / thread receiving operation even by one person.
An object of the present invention is to provide a heat treatment apparatus used in a direct spinning and stretching apparatus.

[0008]

According to the present invention, there is provided a multi-filament yarn group which has been spun and then cooled to a glass transition temperature or lower once. In the heat treatment apparatus for a multi-yarn having a heating cylinder which is heated while traveling inside, the heating cylinder comprises: (A) a rectangular parallelepiped shape in which a plurality of yarn groups traveling from above to below can travel in parallel; A heating space having a shape, wherein the heating space has a continuously decreasing cross-sectional area along the running direction of the yarn, and (B) an ambient temperature in the heating cylinder along the running direction of the yarn. (C) suction means for simultaneously sucking the yarn group , and
A heat treatment apparatus for a multi-thread is provided, which has cutting means for cutting the group of the formed yarns in this order at the lower end of the heating cylinder along the running direction of the yarn.

In the present invention, it is preferable to mount a shutter for separating the accompanying airflow of the yarn group at the entrance of the yarn group above the heating cylinder. Further, the heating means
Is the yarn running direction with respect to the rectangular heating space.
Temperature at least divided into three parts independently
It is preferable that the heating means be free.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a side view (partly including a cross section) schematically showing a multi-thread heat treatment apparatus of the present invention in a direct spinning and drawing method, and FIGS. The front sectional view and the side sectional view which illustrated the heat treatment apparatus for thread | yarns are each shown. In the figure, Y is a multifilament yarn group. However, although only one multifilament yarn is shown in the drawing, a multifilament yarn group (hereinafter referred to simply as “yarn group” unless otherwise specified) is actually provided in a direction perpendicular to the paper surface. Sometimes)
Exist in parallel. Further, 1 is a melt spinneret (hereinafter simply referred to as a “spinner”), 2 is a yarn cooling device, 3 is a non-contact heat treatment device, 4 is a yarn receiving / cutting device, 5
Denotes a shutter, 6 denotes an oil applying device, 7 denotes a pair of take-up rollers, and 8 denotes a winding device.

The heat treatment apparatus 3 comprises at least a heating cylinder 3a, a heating means (divided heater) 3b, and a heat insulating material 3c. At this time, the heating space of the yarn group in the heating cylinder 3a is formed in a rectangular shape, and is formed in a tapered shape in which the cross-sectional area decreases gradually downward. The heating means 3b is divided into a plurality of parts (three divisions in FIGS. 1 and 2), so that a temperature gradient can be freely set for each region in the heating cylinder 3a. The yarn receiving / cutting device 4 is connected to the lower end of the heating tube 3a. Further, the shutters 5 (5a and 5b) are provided at the upper opening of the heating tube 3a and the lower opening of the thread receiving / cutting device 4 so as to be openable and closable. In this manner, the air flow accompanying the traveling yarn group Y is prevented from flowing into the heating cylinder from the upper opening of the heating cylinder 3a, and conversely, heating is performed from the lower opening of the yarn receiving / thread breaking processing device 4. The outflow of air can be suppressed, and the heating efficiency of the yarn group Y can be improved.

In the apparatus configured as described above, the yarn group Y spun from the die 1 is once cooled to the glass transition temperature or lower by the cooling air blown from the cooling device 2 and then the heat treatment device 3 It is stretched by friction with air while entering and being heated. The yarn group Y stretched in this way is applied with an oil agent by an oil agent application device 6 located below the heat treatment device 3 and is taken up by a take-up roller group 7. It is wound up.

Here, as described above, the heating space of the heating cylinder 3a has a length capable of accommodating a plurality of thread groups of multiple weights (many) as shown in FIGS. 2A and 2B. Since they are formed in a rectangular shape, these yarn groups Y can be heat-treated simultaneously in one heating cylinder 3a. However, when the yarn group Y enters the heating cylinder 3a, the yarn group Y entrains a cold airflow around the yarn group Y, and the accompanying airflow is not simultaneously taken into the heating cylinder 3a. Under the influence of the inflow of the air current, a temperature drop occurs to the entrance and the center of the heating cylinder 3a, thereby deteriorating the heating efficiency of the yarn group Y. Regarding this phenomenon, in the conventional heating method in which a heating cylinder is provided for each yarn, the temperature drop is not so fatal, but a large number of yarn groups Y are run in parallel at short intervals. In that case, it is a fatal problem. This is because the generation of the accompanying airflow due to the interaction of the yarn group Y running at a short interval cannot be ignored, as well as the accompanying airflow for each yarn, and thus, the accompanying airflow flowing into the heating cylinder 3a. Is extremely large as compared with the conventional heating method.

Therefore, in the multi-thread heat treatment apparatus of the present invention,
By setting the temperature of the heating means (divided heater) 3b higher at the entrance and at the center relative to the exit,
The heating efficiency at the entrance is increased, and a sufficient amount of heat can be given to the yarn. This makes it possible to design the heat treatment apparatus more compactly as compared with a conventional heat treatment apparatus in which a heating cylinder is provided for each yarn.

Further, when the heating cylinder 3a has the rectangular shape as in the present invention, when the accompanying airflow brought in by the yarn group Y enters the heating cylinder 3a, the flow rate of the accompanying airflow varies. Since the distribution of the heating atmosphere temperature inside the heating cylinder 3a is disturbed by this, a difference in physical properties occurs between the yarns due to this. Therefore, the heating cylinder 3a
By attaching a shutter 5a to the upper opening of the first group, the quality of each yarn can be kept uniform by actively controlling the carry-in air flow of the yarn group Y to a constant amount.

Next, another important point in the present invention is that the inside of the heating cylinder 3a of the present invention has a cross-sectional area continuously reduced along the running direction of the yarn group Y over the entire length. That is. By this effect, the multi-thread heat treatment apparatus of the present invention can be designed more compactly.

This will be described in detail below by comparing the difference between the conventional heat treatment apparatus and the heat treatment apparatus of the present invention. That is, in general, a yarn picked up at a high speed generates tension due to air resistance caused by friction with air, and the heated yarn is drawn by this. It increases as the traveling speed increases and the traveling distance increases. Therefore, in the conventional heat treatment apparatus, in order to obtain a necessary and sufficient stretching tension in the heating cylinder, it is necessary to secure the distance from the die to the entrance of the heat treatment apparatus to a certain length or more. However, in practice, when a heat treatment apparatus is installed in a direct spinning and drawing apparatus, naturally, the heat treatment length of the heat treatment apparatus is also limited due to limitations in workability and the dimensions of the building, and the heat treatment apparatus is unnecessarily restricted. The length cannot be lengthened.
Therefore, when the single fiber denier of the yarn becomes large, the heat treatment length becomes insufficient, which may cause insufficient heating.However, it is not possible to sufficiently secure the stretching tension, and a predetermined physical property is obtained. It becomes difficult.

Therefore, in the present invention, the cross section of the heating cylinder is formed in a tapered shape, and the air accompanying the yarn group Y is narrowed down as the heating cylinder moves downward. The resistance is increased. And, by this ingenuity, the momentum change of the airflow accompanying the yarn group Y can be skillfully utilized, and this makes it impossible for the first time to obtain a large amount of heat which cannot be obtained by the conventional tubular heat treatment apparatus that heat-treats each yarn. The stretching force was obtained.

Finally, in the present invention, unlike the conventional method of individually threading each heating cylinder provided for each thread, a plurality of thread groups are put together and the threading and the thread receiving are performed. -It has the advantage that the thread can be broken. Therefore, FIG.
This will be described in detail with reference to FIG.

FIGS. 3 and 4 show an embodiment of a yarn dropping / yarn receiving and yarn breaking process using the apparatus of the present invention. In the figure, a yarn receiving / yarn processing device 4 has two functions of a yarn dropping / yarn receiving function and a yarn breaking processing function in one device, and is mounted in an integrated form directly below the heat treatment device 3. It is configured to include at least a suction means (hereinafter, referred to as a "suction nozzle") 4a and a yarn cutting means 4b.

Here, the suction nozzle 4a is configured so that a plurality of yarns passing through the inside of the heat treatment apparatus 3 can be simultaneously sucked. For this reason, it is preferable that the suction port is formed in a funnel shape that diverges toward the tip so that a plurality of yarn groups can be simultaneously sucked. The suction force for sucking the yarn group can be obtained also by generating a negative pressure by a vacuum pump, thereby generating an air flow flowing into the suction port, or by an ejector method using compressed air. Can also be obtained.

Further, the yarn cutting device 4b cuts another uncut yarn group when a certain yarn breaks, so that all the yarn groups Y can be sucked into the suction nozzle 4a. Play a role. Therefore, the yarn cutting means 4
b should be able to fulfill this role, and therefore, a single yarn cutting device may be capable of cutting all the yarn groups passing through the heat treatment device, and one yarn for each yarn. You may make it provide a thread cutting apparatus group corresponding to each stand. As such a cutting means, for example, a mechanical cutter utilizing a shearing force, an electric cutter for fusing the yarn with a heated blade, or the like can be suitably used.

Hereinafter, as an example, a procedure of a yarn dropping / yarn receiving operation with six weights (six yarn groups) using the above-described device will be described. First, when the yarn is hooked to the heat treatment device 3, the suction nozzle 4a constituting the yarn receiving / cutting device 4 is preliminarily activated so that the yarn group can be sucked as shown in FIG. . In this state, the yarn hooking worker goes to the upper part of the heating cylinder 3a, drops the six yarn groups from the upper part collectively, and makes the suction nozzle 4a suck it. Next, the worker goes to the lower part of the heating cylinder and collectively transfers the yarn group Y sucked by the suction nozzle 4a to the yarn hooking-purpose suction gun 9, thereby performing the threading to the heat treatment apparatus 3. Can be done very easily.

Next, the thread break processing shown in FIG. 4 will be described. First, as shown in FIG. 1, the yarn group Y is spun from the spinneret 1, passes through the heat treatment device 3, and is normally wound from the take-up roller 7 to the winding machine 8. The following description is based on the assumption that a yarn break has occurred in this state. If a yarn break occurs at any of the weights, it is detected that the yarn has been broken by a yarn break detector (not shown) (provided for each weight) or by the discovery of an operator. When the yarn breakage is detected in this way, as shown in FIG. 4A, the suction nozzle 4a enters a state in which the yarn group can be sucked. Then, the yarn cutting device 4b attached to the lower part of the heat treatment device 3 operates,
The uncut yarn is forcibly cut at a position below the suction nozzle 4a. The yarn group thus cut is simultaneously sucked by the suction nozzle 4a.

As described above, when the six yarn groups are simultaneously sucked into the suction nozzle 4a, next, FIG.
As shown in (B), the shutter 5b installed at the yarn exit of the yarn receiving / breaking device 4 is opened widely, and the yarn Y sucked by the suction nozzle 4a is moved to the suction gun 9 for exclusive use of the yarn hooking. Hand over to In this way, the yarn group sucked by the yarn hooking suction gun 9 is hooked to a downstream device after the oil application device, which is a subsequent operation.

[0026]

As described above, according to the present invention, by dividing the heater (heating means) inside the heating cylinder, the atmospheric temperature in the heating cylinder along the yarn running direction can be freely adjusted. Thus, heat can be efficiently applied to the yarn. Further, by providing a shutter at the entrance of the yarn group at the upper part of the heating cylinder, it is possible to control the air flow accompanying the yarn group and obtain uniform yarn physical properties. Furthermore, by continuously reducing the cross-sectional area of the heating cylinder along the running direction of the yarn, it is possible to enhance the drawing effect on the yarn group passing through the heating cylinder.

Further, by using a heat treatment apparatus having a heating tube having a rectangular parallelepiped shape, a plurality of yarn groups can be processed at the same time. There is no need to process each cylinder. For this reason, at the time of start-up of the stop or stop equipment or at the time of the yarn breakage processing, the yarn dropping / yarn receiving operation can be performed quickly, simply and efficiently, and the processing by one person operation which cannot be performed by the conventional method is performed. Made it possible.

As a result, the heat treatment apparatus can be made compact, and even if the single fiber denier of the yarn to be heat-treated becomes large, the heat treatment can be sufficiently performed in the conventional equipment arrangement space. And from the viewpoint of workability,
By making it possible for a single worker to perform the thread dropping / thread receiving work, which was conventionally difficult with one person, a particularly remarkable effect that productivity can be greatly improved can be obtained.

[Brief description of the drawings]

FIG. 1 is a schematic side view illustrating a direct spinning and drawing step to which the apparatus of the present invention is applied.

FIG. 2 is a view illustrating a heat treatment apparatus for a multifilament of the present invention, wherein FIG. 2 (A) is a front sectional view and FIG. 2 (B) is a side sectional view. .

FIG. 3 is a side view partially including a cross section, illustrating a yarn dropping / yarn receiving operation using the multifilament heat treatment apparatus of the present invention.

FIG. 4 is a side view partially including a cross-section, illustrating a yarn cutting operation procedure using the multi-thread heat treatment apparatus of the present invention.

[Explanation of symbols]

 Y Yarn group 1 Spinneret 2 Cooling device 3 Heat treatment device 4a Suction means 4b Cutting means 5a Upper shutter 6 Oil applying device 7 Take-up roller 8 Winding machine 9 Suction gun dedicated to threading

Continuation of the front page (56) References JP-A-7-278991 (JP, A) JP-A-4-263608 (JP, A) JP-A-7-268721 (JP, A) JP-A-62-69816 (JP) , A) (58) Field surveyed (Int. Cl. ⁷ , DB name) D01D 1/00-13/02 D02J 1/22 D01F 6/62 301-308

Claims (3)

(57) [Claims] A multi-filament yarn heat treatment apparatus having a heating tube in which a plurality of multi-filament yarn groups which have been spun and once cooled to a glass transition temperature or lower are heated while running therein. The heating cylinder has (A) a rectangular heating space in which a plurality of yarn groups traveling from above to below can travel in parallel, and the heating space is continuous along the traveling direction of the yarn. (B) having heating means capable of adjusting the ambient temperature in the heating cylinder along the running direction of the yarn, and (C) simultaneously sucking the yarn group Suction means ,
A heat treatment apparatus for a multi-filament, comprising a cutting means for cutting a group of yarns formed in this order at the lower end of the heating cylinder along the running direction of the yarn. 2. A shutter for separating an accompanying airflow of the yarn group at an entrance of the yarn group at an upper portion of the heating cylinder.
The heat treatment apparatus according to the above. 3. The heating device according to claim 2, wherein the heating unit heats the rectangular body.
At least three divisions along the yarn running direction with respect to the space
It is a heating means that allows the temperature to be adjusted independently of each other
The heat treatment apparatus according to claim 1.