JPH0639724B2 - Yarn heat treatment equipment - Google Patents

Description

Description: TECHNICAL FIELD OF THE INVENTION The present invention relates to a heat treatment apparatus for yarns, and more particularly to improvement of a heat treatment apparatus by steam when melt-spinning a thermoplastic synthetic polymer such as nylon 66.

[Prior art]

For example, in the heat treatment device provided in the melt spinning process of nylon 66, the necessary condition for heat treatment with superheated steam is that the spun yarn has large yarn spots (Wester spots).
That is, a sufficient heat treatment can be performed without generating

Still another problem is that part of steam leaks out of the heat treatment apparatus along with the traveling yarn after heat treatment, and the leaked steam disturbs the surrounding atmosphere. Generally, in a synthetic fiber manufacturing factory, it is necessary to control the temperature and humidity inside the room in order to maintain operability and quality.
The turbulence of the atmosphere due to such steam leakage not only affects the operability and quality, but also increases the cost for temperature control.

[Object of the Invention]

It is an object of the present invention to provide a yarn heat treatment apparatus which minimizes the occurrence of yarn unevenness when heat-treated with steam and prevents the disturbance of the atmosphere due to leaked steam.

[Structure of Invention]

A yarn heat treatment apparatus according to the present invention that achieves the above object,
(B) A yarn which is surrounded by a heat insulation jacket to form a heat treatment region therein, and a yarn inlet and a yarn exit are respectively provided at both ends of a heating cylinder which hermetically separates the heat insulation jacket from the heat treatment region. (B) A steam outlet connected to a heat source is provided near the yarn inlet, and a first steam outlet connected to an exhaust means is provided near the yarn outlet. A suction port is provided in each of the heat insulation jackets, and (c) a cooling pipe extending from the first suction port to the outside of the heat insulation jacket is provided at the first suction port, and (d) the cooling pipe, A second suction port for steam connected to the exhaust means is provided.

Example of Invention

 The present invention will be described below with reference to the embodiments shown in the drawings.

In the figure, 1 is a heating cylinder, and the inside of this heating cylinder 1 is a heat treatment region 2 for heat treating the yarn Y,
The outside is surrounded by a heat insulation jacket 3. The heat insulation jacket 3 is surrounded by a heat insulating material 4, and steam is introduced from a lower supply pipe 5 to perform heating, and the steam after heat exchange is discharged from an upper discharge pipe 6.

A yarn inlet 7 is provided in the upper part of the heating cylinder 1, and a yarn outlet 8 is provided in the lower part. The cross-sectional areas of the yarn inlet 7 and the yarn outlet 8 are each narrowed so as to be smaller than the internal cross-sectional area of the heat treatment region 2. The yarn inlet 7 is further provided with two-stage throttles, and the labyrinth effect of the multistage throttle prevents the heated gas in the heat treatment region 2 from leaking to the outside of the yarn inlet 7. Of course, the number of drawing stages of the yarn inlet 7 may be one, or may be three or more.

Below the yarn inlet 7, a plurality of outlets 9 for blowing out superheated steam are opened in a horizontal row, and these are provided in multiple stages. From this outlet 9, the superheated steam supplied from the supply pipe 10 is blown out through the flow straightening chamber 11 and its blowing direction is directed to the yarn axis of the traveling yarn Y. I try not to be. Rectifying room 11
Is provided with a rectifying plate 11a therein, and the rectifying plate 11a is configured to evenly disperse and rectify the superheated steam supplied from the supply pipe 10 around the heating cylinder 1. Therefore, the overheated steam is centripetally blown from the outlet 9 toward the yarn axis of the traveling yarn Y. Further, the supply pipe 10 is surrounded by a heat insulating jacket 15 so that the superheated steam does not condense and become a drain before reaching the flow straightening chamber 11. It is preferable that a plurality of air outlets 9 are evenly distributed around the entire circumference of the heating cylinder 1. The row of the outlets 9 in the horizontal direction may be a single row instead of a plurality of rows.

An annular slit-shaped first suction port 12 is provided at the yarn outlet 8 to forcibly suck the overheated steam in the heat treatment area 2. The first suction port 12 is provided in the rectification chamber 13
It is connected to a suction pipe 14 communicating with a blower or the like (not shown) via the. The rectifying chamber 13 has a rectifying plate 13a therein,
This straightening plate 13a uniformly disperses the superheated steam sucked from the first suction port 12 all around the suction pipe 14a.
Try to lead to. The first suction port 12 is arranged in the heat insulation jacket 3.

A cooling pipe 16 is provided below the first suction port 12,
In addition, it projects to the outside of the heat insulation jacket 3 for a long time. A second suction port 21 is provided in the middle of the cooling pipe 16. The second suction port 21 is connected to a suction pipe 23 that communicates with a blower or the like (not shown) via a rectifying chamber 22 having a rectifying plate 22a therein. And this second on the downstream side
The suction port 21 of the above positively sucks excess steam accompanying the yarn Y without being sucked by the first suction port 12 on the upstream side,
Prevent it from leaking to the outside air. On the other hand, the cooling pipe 16 contacts the surface with low temperature outside air, cools and condenses the excessive steam passing through the inside, and assists the second suction port 21 so as not to discharge the steam directly into the outside air.

A drain focusing tube 18 having an inner wall surface inclined with respect to the yarn axis (vertical direction) is attached to the lower end of the cooling tube 16. An enlarged hole 18a is formed at the opening end of the drain focusing tube 18 by further enlarging the opening. Further, a drain receiver 20 is provided at the lowermost end of the enlarged hole 18a. The drain converging tube 18 uses the inclined inner wall surface to condense the drain condensed in the cooling tube 16 to one place on the lower side of the inner wall surface, and to condense it through the enlarged hole 18a to receive the drain 20. I'm trying to let it drip. By condensing the drain as described above, it is possible to prevent the drain from adhering to the traveling yarn Y and prevent the floor surface from being soiled. Further, the enlarged hole 18a of the drain focusing tube 18 makes it easy to insert the tip of the suction gun, and facilitates the thread hooking operation by the suction gun.

In the yarn heat treatment apparatus described above, the superheated steam blown from the outlet 9 of the yarn inlet 7 is forcibly sucked from the first suction port 12 of the yarn outlet 8, so that the flow of the superheated steam is
A controlled flow along the running yarn Y can be achieved in the heat treatment zone 2, as indicated by the arrow in FIG. Since such superheated steam has a controlled flow along the traveling direction of the yarn Y, the yarn fluctuation can be suppressed and the occurrence of yarn unevenness can be reduced. Moreover, when the cross-sectional area of the heat treatment area 2 is larger than the cross-sectional area of the yarn inlets and outlets 7 and 8 as in the embodiment, a part of the superheated steam reaching the lower portion of the heat treatment area 2 according to the above-described controlled flow. Is a convection that reverses and goes to the outer peripheral side and rises along the inner wall surface of the heating cylinder 1. In this way, heat is exchanged with the heat insulation jacket 3 while a part of the superheated steam rises along the inner wall surface of the heating cylinder 1, and when the superheated steam flows down along the traveling yarn Y again, The obtained heat is applied to the yarn Y. Therefore, the yarn Y running in the heat treatment area 2 is sufficiently heat-treated by the convection of such superheated steam.

In order to make such heat treatment effect more effective, it is desirable that the ratio D / d of the maximum inner diameter D of the heat treatment region 2 and the minimum inner diameter d of the yarn inlets and outlets 7, 8 is 2 or more. Of course, as long as the above relationship is maintained, the diameter of the yarn inlet 7 and the yarn outlet 8
The diameters of the two do not necessarily have to be the same. When the inner diameter D of the heat treatment area 2 is large enough to cause the convection phenomenon, the above effect can be expected, but when the inner diameter D of the heat treatment area 2 is small, the length of the heat treatment area 2 is further increased. In the case of long, the convection phenomenon often does not easily occur. Even in this case, by reducing the diameter d of the yarn inlets / outlets 7 and 8, the superheated steam can be contained in the heat treatment region 2 and a sealing effect with the outside air can be expected. By increasing the superheated steam density, heat exchange between the yarn and the superheated steam is efficiently performed, and the heat treatment effect is made more effective.

The drain attached to the first suction port 12 hinders the flow of superheated steam and makes the flow rate constant steady, which is a major cause of yarn unevenness. The placement of the first suction port 12 in the heat insulation jacket 3 The configuration can effectively eliminate such obstacles.

The overheated steam is positively sucked at the first suction port 12, but it is impossible to suck all of the steam, so part of it will go below the yarn outlet 8 along with the traveling yarn Y. And However, in the above apparatus, this excess steam is sucked at the next second suction port 21, and further cooled and condensed in the cooling pipe 16 to be drained, so that the steam leaks to the outside air and disturbs the atmosphere. There is no such thing. Also, the drain is the drain focusing tube 1
Since it is focused on one place by 8 and taken out to the drain receiver 20, it does not adhere to the traveling yarn Y or stain the floor surface.

Further, the suction pressure sucked from the suction ports 12 and 21 provided in two stages can be selected to an optimum value together with the steam pressure blown from the suction port 9 according to the steam heat treatment condition of the yarn. preferable.

〔The invention's effect〕

As described above, the heat treatment apparatus of the present invention has (a) a heat treatment area surrounded by a heat insulation jacket to form a heat treatment region therein, and
A yarn heat treatment apparatus in which a yarn inlet and a yarn outlet are provided at both ends of a heating cylinder that airtightly separates the heat insulation jacket and the heat treatment region, and (b) in the vicinity of the yarn inlet. A steam outlet connected to a heat source, and a first suction port for steam connected to an exhaust means in the vicinity of the yarn outlet in the heat insulation jacket, and (c) the first A cooling pipe extending from the first suction port to the outside of the heat insulation jacket,
(D) Since the cooling pipe is provided with the second suction port for the steam connected to the exhaust means, the steam in the heating cylinder is controlled to flow along the running direction of the yarn to prevent the occurrence of yarn unevenness. The surplus steam that can be reduced and is not sucked in by the first suction port on the upstream side is partially condensed and drained in the cooling pipe on the downstream side, and further, the remaining steam becomes the second steam. Since it is sucked in through the suction port, it is rarely released as steam into the outside air. Therefore, the disturbance of the atmosphere due to the leaked steam can be eliminated.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a heat treatment apparatus according to an embodiment of the present invention. 1 ... Heating cylinder, 2 ... Heat treatment area, 3 ... Heat insulation jacket, 7 ... Thread inlet, 8 ... Thread outlet, 9 ... Blowing outlet, 12
...... First suction port, 16 ... Cooling pipe, 21 ... Second suction port.

Claims (1)

[Claims] (A) A yarn inlet and a yarn outlet are formed at both ends of a heating cylinder which is surrounded by a heat insulation jacket to form a heat treatment region therein and which hermetically isolates the heat insulation jacket from the heat treatment region. (B) A steam outlet connected to a heat source is connected in the vicinity of the yarn inlet, and an exhaust means is connected in the vicinity of the yarn outlet. (1) A first suction port of steam is provided in each of the heat retaining jackets, and (c) a cooling pipe extending from the first suction port to the outside of the heat retaining jacket is provided in the first suction port. A yarn heat treatment apparatus, wherein the cooling pipe is provided with a second suction port for steam connected to an exhaust means.