JPH066466U - Synthetic fiber heating equipment - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a device capable of uniformly heating yarns without temperature unevenness in the width direction between yarns running in parallel. [Structure] A heater 8 is installed at an inlet of a heating device body 1 in which a slit 5 is formed between heating plates 2 and 3 and a side plate 4.
A hot air blowing nozzle 6 is provided which is connected to a blower 9 with the air blower interposed therebetween. Since the nozzle 6 blows off and replaces the cold outside air that accompanies the traveling yarn y, the hot-air blowing hole 7 has an inclination angle α of 30 to 85 degrees with respect to the vertical direction Y with respect to the traveling yarn y. The hot air is arranged so as to flow in the yarn traveling direction.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a yarn heating device, and more particularly to a slit type heating device for heating synthetic fibers.

[0002]

[Prior art]

 Conventionally, a steam heating device, an infrared heating device, a fluidized bed heating device, a hot air circulation heating device, a heating element contact heating device, etc. have been industrially used as a heating device for hot drawing and heat treatment of synthetic fibers.

Although contact heating is superior only from the viewpoint of heating efficiency, the facility is simple, fibers are not damaged by friction, and a special treatment agent for post-processing (for example, rubber) is used. However, when a pretreatment agent for adhesion with resins is applied, non-contact drying is essential because an adhesive scum is formed during drying, so a narrow slit is formed by facing the heating plates. A so-called slit type heating device, in which a yarn running in the slit is heated by heat transfer from a heating plate to heat the yarn running in the slit, is often used widely and is widely used. .

However, the drawback of this slit type heating device is that the temperature inside the heating device is likely to drop because cold air accompanying the traveling yarn enters the slit from the slit inlet, and the width direction of the slit is wide. The two points are that a temperature distribution is generated (the temperature drop at both ends is relatively small and the temperature drop at the center is large).

Therefore, not only is the thermal efficiency poor, but a difference in heating temperature occurs between the yarn running in the center of the slit and the yarn running in the ends of the slit, and There is a difference in strength and elongation, heat shrinkage, etc., which is not desirable.

In order to improve such a drawback, it has been proposed to install a plurality of weir plates in the slit by disturbing the gas accompanying the traveling yarn (Japanese Patent Publication No. 46-17292). ).

Certainly, if the pitch between the yarns that are run in parallel is about 20 mm, the slit-type heating device provided with a weir plate has a remarkable effect of reducing temperature unevenness in the lateral direction of the slit. When the pitch between the yarns is reduced to 10 mm or less to increase the productivity and the number density of running yarns is increased, the effect of this dam plate is weakened, and as shown in the curve in FIG. Distribution will occur.

This tendency becomes more remarkable as the pitch between the yarns becomes shorter, which is a serious problem for increasing the equipment productivity.

[0009]

[Problems to be solved by the device]

 The present invention solves the above-mentioned conventional problems, and even if the pitch between yarns that are run in parallel is shortened in order to improve equipment productivity, uniform yarn heating is possible without causing temperature unevenness in the width direction. It provides a simple device.

[0010]

[Means for Solving the Problems]

 That is, the present invention is a slit type heating device in which heating plates are opposed to each other to form a slit, and a plurality of yarns are run in the slits to heat the yarns by heat transfer from the heating plate. In the device, a hot air blowing nozzle, which has an angle of 30 to 85 degrees with the axis perpendicular to the running yarn and blows hot air so as to make a forward flow in the yarn running direction, is provided at the inlet of the heating device. The heating device for synthetic fibers is characterized by the above.

[0011]

[Action]

 According to the present invention, a hot-air blowing hole having an inclination angle of 30 to 85 degrees with respect to the running yarn is provided at the inlet of the heating device, and the hot air blown from this hole is run in parallel. The cold outside air that accompanies the threads is blown away and replaced, and hot air is introduced into the slits along with the threads instead of the cold air. Therefore, the uniformity of the internal temperature is maintained, the thermal efficiency is improved, and the temperature unevenness in the width direction of the slit is eliminated.

[0012]

【Example】

 Hereinafter, the present invention will be described with reference to the drawings. FIG. 1 is a schematic layout view showing an embodiment of the present invention, and FIG. 2 is an enlarged perspective view of a hot air blowing nozzle.

In FIG. 1, reference numeral 1 denotes a main body of a slit-type heating device, which is configured to include an upper heating plate 2 and a lower heating plate 3, and side plates 4 provided on both sides to prevent heat radiation from the both sides. A slit 5 is formed between these heat plates 2 and 3 and the side plate 4. Both sides of the heat plates 2 and 3 are sealed by the side plates 4, but the invention is not limited to this. For example, slits can be formed by forming concave grooves on both or one side of the upper and lower heat plates to seal both sides. May be formed.

A hot-air blowing nozzle 6 is provided at the inlet (inlet and its vicinity) of the heating device main body 1. The nozzle 6 is connected to a blower 9 with a heater 8 in between, and the fluid taken in is taken in. Is heated to a predetermined temperature and introduced into the nozzle.

The hot air jet nozzle 6 has a hot air blow hole 7 having a slit hole 7a as shown in FIG. 2A, or a nozzle having a circular blow hole 7b as shown in FIG. 2B. The shape may be used, but in order to blow off and replace the cold outside air accompanying the traveling yarn y, the hot air blowing holes 7 form an angle of 30 to 85 degrees, preferably 45 to 85 degrees with the vertical direction Y with respect to the traveling yarn y. Has an inclination angle α (strictly speaking, the blowing direction of the hot air), and is arranged so that the blown hot air flows forward in the yarn traveling direction.

Reference numeral 10 denotes a roller group, and the yarns y taken up by these rollers run in parallel and receive hot air from the blowout hole 7 immediately before the heating device, and the accompanying cold outside air is blown away and replaced with hot air. Then, it enters the slit of the heating device together with the hot air.

Although the nozzle itself is inclined in FIG. 1, it is not necessary to incline the nozzle as long as the blowing hole itself is inclined so that the blowing direction X of the hot air satisfies the above inclination.

It is desirable that the blowing speed of the hot air is set to 10 m / sec, preferably 15 m / sec or more so that the accompanying cold air can be blown off and replaced with the hot air. Further, when the inclination angle of the nozzle is less than 30 degrees, the cold air accompanying the running yarn is blown off, but the surrounding cool air enters in front of it and hot air is hard to accompany the heating device. On the contrary, when the temperature exceeds 85 degrees, the effect of blowing off the accompanying cold air is small, and most of the cold air accompanies the heating device together with the hot air, causing a decrease in the temperature of the slit part of the heating device.

Although it is necessary to adjust the temperature of the hot air according to the temperature of the slit type heating device, it is usually preferable to set the temperature higher than the temperature of the heating plate. Also, since the heat capacity of the hot air is small, it is desirable to install the hot air blowing nozzle as close as possible to the inlet of the heating device.If the distance becomes longer, it will be difficult to achieve the desired effect unless the hot air temperature is set higher. . The nozzle may be integrated with the heating device, or a plurality of nozzles may be provided on both sides or one side of the traveling yarn.

As described above, in order to replace the cold air that accompanies the yarns running in parallel with the hot air, the blowing direction of the hot air with respect to the running yarns must be a forward flow, and the hot air is blown backward. Therefore, hot air is less likely to accompany the running yarn, and it is difficult to maintain the temperature uniformity inside the slit.

More specifically, FIG. 3 shows that a slit type heating device having a length of 4 m, a slit width of 40 cm, and a slit gap of 3 cm is heated to 280 ° C., and 1100 denier polyethylene terephthalate drawn yarn is pitched at 6 mm. The graph shows the temperature distribution in the width direction of the slit measured at 100 cm from the slit entrance when 50 pieces are arranged at intervals and run at a speed of 260 m / min.

Here, the curve A shows the case where a conventional device provided with a barrier plate is used, and the temperature at the center of the slit is much lower than that at the slit end. This is because the yarn pitch is small and the running yarns are extremely dense, so a large amount of outside air flows into the slits along with the running yarns, and the temperature distribution cannot be corrected only by the disturbing effect of the weir plate. It is shown that.

On the other hand, curve B shows the case where the device of the present invention is used, and it can be seen that the thermal efficiency is improved and the temperature unevenness in the lateral direction of the slit is eliminated. In the conventional device, the shrinkage ratio measured under dry heat at 150 ° C was 1.6% between the yarn running at the slit end and the yarn running at the slit central part. The difference when using the device of the invention was only 0.2%.

[0024]

[Effect of device]

 As described above, according to the present invention, even if a large number of yarns are closely run parallel to each other in order to improve the productivity of the equipment, the thermal efficiency is reduced and the slit width direction is a drawback of the slit type heating device. No temperature spots occur. Therefore, it can be widely used as a heating device for synthetic fibers, which is suitable for improving equipment productivity in recent years.

[Brief description of drawings]

FIG. 1 is a schematic layout view showing an embodiment of the present invention.

FIG. 2 (a) is an enlarged perspective view of the hot air blowing nozzle of FIG. (B) It is an expanded perspective view which shows another hot air blowing nozzle.

FIG. 3 is a relationship diagram showing a temperature distribution in a slit width direction.

[Explanation of symbols]

 1 main body of slit type heating device 2 hot plate 3 hot plate 5 slit 6 hot air blowing nozzle 7 hot air blowing hole 8 heater 9 blower

Claims (1)

[Scope of utility model registration request] 1. A slit is formed by facing heating plates to each other,
In a slit-type heating device in which a large number of yarns are run in the slits to heat the yarns by heat transfer from a heating plate, the angle with the axis perpendicular to the running yarns is 30 to 85.
A heating apparatus for synthetic fibers, characterized in that a hot-air blowing nozzle, which has a degree of inclination and blows hot air so as to be a forward flow in the yarn traveling direction, is arranged at the inlet of the heating apparatus.