JPH07109613A - Device for producing polyester fiber yarn - Google Patents

Abstract

PURPOSE:To reduce difficulty caused by the adhesion of a polyester fiber yarn to the inner wall surface of a heating cylinder by cooling and solidifying the fiber yarn melt-spun from a spinneret at a temperature below the glass transition point of the polyester, guiding the solidified fiber yarn into a specific heating cylinder, and subsequently heat-drawing the fiber yarn. CONSTITUTION:A polyester fiber yarn 1 melt-spun from a spinneret 3 is cooled and solidified with a cooling device, etc., at a temperature below the glass transition point of the polyester, guided into a heating zone 5, heat-drawn, and subsequently wound up. The passage of the yarn in the heating zone is formed of a double heating cylinder. The peripheral thermal medium 7 of the double heating cylinder is heated with an electrically heating wire 6, etc. In the double heating cylinder, a metal inner cylinder 12 is detachably inserted into a metal outer cylinder 8, and when the removal of a yarn adhered to the metal inner cylinder is difficult, the metal inner cylinder can be pulled out and exchanged with a new inner cylinder.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for producing a polyester fiber yarn by direct winding and drawing.

[0002]

2. Description of the Related Art Conventionally, various apparatuses for producing polyester fiber yarn by direct winding have been proposed. As an example, Japanese Patent Publication No. 46-1932 discloses that the melt-spun yarn is once cooled to a temperature below the glass transition temperature and then again 80-
A method is disclosed in which the material is passed through a heating zone of 140 ° C. and hot-stretched. However, at this temperature, since the heating ability is insufficient, the yarn is not sufficiently drawn, and only the yarn having high elongation and low strength can be obtained.

Further, in Japanese Examined Patent Publication No. 63-43483, melt-spun yarns are once cooled to below the glass transition temperature and then passed through a heating zone of 200 ° C. again, and heated gas of 200 ° C. is positively applied from the upper portion of the heating zone. The method of introducing the method is disclosed. However, the above method generally
Since a heating cylinder made of metal such as stainless steel whose surroundings are heated is used as the heating zone, when the yarn is to be introduced into the heating zone at the start of operation or when the yarn is cut, unstretched When the yarn in the state comes into contact with the heating cylinder made of metal at about 200 ° C, it contacts the inner wall of the heating cylinder, melts and adheres, cannot pass through the heating zone, and the operation is significantly hindered. There is. Further, when the heated gas is introduced, there is a problem that the sway of the yarn is great and the inner wall is easily contacted in the heating zone.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is, in a direct spinning and drawing apparatus for polyester fiber yarns, to introduce the yarns into the heating zone again at the start of operation or when the yarns break. At this time, the yarn in the unstretched state is unlikely to adhere to the inner wall of the heated heating cylinder in the heating zone, and the heating cylinder is made easy to replace so that the yarn cannot pass through the heating zone. An object of the present invention is to provide a polyester fiber yarn manufacturing apparatus capable of solving the problem that the operation is significantly hindered.

[0005]

[Means for Solving the Problems] That is, the above-mentioned problems are solved by directly cooling and solidifying a polyester fiber yarn melt-spun from a spinneret to a temperature below the glass transition temperature, introducing it into a heating zone, heating and stretching, and then directly winding it. In a spinning / drawing apparatus, a polyester fiber yarn manufacturing apparatus is characterized in that the yarn passage of the heating zone comprises a double heating cylinder in which a detachable metal inner cylinder is inserted in a metal outer cylinder. It

In a method for producing a polyester fiber yarn by direct winding using a direct spinning / drawing apparatus, the melt-spun yarn is once cooled and solidified below a glass transition temperature, subsequently passed through a heating zone, and then wound. Taken. At the start of operation or when the yarn is cut, the polyester fiber yarn melt-spun from the spinneret is passed through the heating zone while being sucked by the suction device provided at the inlet or outlet of the heating zone, and then the winding device. Continue the guidance and winding operation.

At this time, when passing through the heating zone, the polyester fiber yarn may sway and come into contact with the wall surface of the metallic heating cylinder inside the heating zone. In order to obtain a polyester fiber yarn having practical properties, the inlet of the heating zone is installed at a position of about 2 m from the spinneret, the length of the heating zone is set to about 2 m, and the temperature of the heating zone is 200 ° C. It is necessary to keep it back and forth. Alternatively, a heated gas at about 200 ° C. may be used together. However, when the heated gas at about 200 ° C. is used together, the yarn is more swayed and is likely to come into contact with the wall surface.

At a temperature of about 200 ° C. in the heating cylinder, the polyester fiber yarn is in an unstretched state and easily adheres when it comes into contact with a metal surface, and once attached, it is difficult to separate. The polyester fiber yarn manufacturing apparatus of the present invention has a structure in which a heating cylinder made of metal such as stainless steel is provided as a yarn passage in the heating zone, and the surroundings are heated and kept warm.

The polyester fiber yarn producing apparatus of the present invention is characterized in that the heating zone comprises a double heating tube in which a detachable metal inner tube is inserted in a metal outer tube. If the thread adheres and cannot be removed, the metal inner cylinder can be pulled out and replaced with another metal inner cylinder. It is preferable that the inner wall surface of the heating cylinder is not a mirror surface but has a satin-finished concavo-convex finish. If the inner wall surface has a satin-like textured finish, the polyester fiber threads in an unstretched state are unlikely to adhere even if they are kept at a temperature of around 200 ° C. even if they contact the inner metal tube. The depth of the satin-like unevenness is preferably 6 to 10 S in the case of blasting. Furthermore, it is preferable that the inner wall surface is made of a resin material such as a fluorine-based resin because it is more difficult to adhere to the inner wall surface.

[0010]

EXAMPLES Hereinafter, a polyester fiber yarn manufacturing apparatus of the present invention will be described in detail with reference to an explanatory view schematically showing one example. In FIG. 2, 1 is a yarn, 2 is a cold air, 3 is a spinneret, 4 is a cold air device, 5 is a heating zone (electric heater), 6 is a heating wire, 7 is a heating medium, 8 is a heating cylinder made of metal, 9 Is a first take-up roll, 10 is a second take-up roll, 11 is a winding device, and FIGS.

The polyester fiber yarn melt-spun from the spinneret is once cooled to the glass transition temperature or lower by the cool air blown from the cool air device, and then guided to a heating zone (heated by an electric heater) and heated and stretched. It The yarn that has exited the heating zone is applied with an oil agent by an oil agent applying device (not shown), then passes through the first take-up roller and the second take-up roller, and is taken up by the take-up device.

Inside the heating zone, there is a double heating cylinder made of metal, which serves as a thread passage, and the circumference of the heating cylinder made of metal is heated to a constant temperature by a heating medium heated by a heating wire. It has a structure to be kept. Although an electric heater is used in the heating zone, it is not limited to this. In addition, the evaluation of the adhesion of the yarn to the inner wall surface of the heating cylinder was performed by the naked eye after the heating cylinder was cooled.

[0013]

Examples 1 to 4 The heating zone has a length of 1.5 m and an outer diameter of 43 mm in a metal heating cylinder having an inner diameter of 45 mm.
An experiment was carried out using a polyester fiber yarn production apparatus having a structure in which a metal inner cylinder having an inner diameter of 39 mm was inserted and which was installed at a position 2.0 m away from the spinneret. The inner wall surface of the metal inner cylinder having a surface roughness of 8S was used.

A melt of polyester (viscosity ηSP / C = 0.64) was spun from a spinneret having 36 holes of 0.5 mm diameter at a temperature of 290 ° C. and a discharge rate of 44.6 g / min.
A cold air at 0 ° C. was blown out at 0.5 m / sec to cool the yarn below the glass transition point. The yarn once cooled and solidified to a temperature not higher than the glass transition temperature by cold air is heated and drawn in the heating zone, and the oil agent is applied by an oil agent applying device (not shown) provided at the outlet of the heating zone. The polyester fiber yarn of 73 denier / 36f, which has been bundled, is passed through the first take-up roller and the second take-up roller, and is taken up by the take-up device.
It was wound at a speed of 00 m / min.

The temperature of the heating zone was maintained at 175 ° C. (Example 1), 200 ° C. (Example 2), 225 ° C. (Example 3) and 230 ° C. (Example 4), spun and wound.
Table 1 shows the results regarding operability. Examples 1 to 3
When the yarn is introduced into the heating zone at the start of operation, the metal inner cylinder with a satin finish is inserted, so the yarn does not fuse even if it contacts the inner wall of the heating cylinder. It was

In Example 4, when the yarn was guided to the heating zone at the start of the operation, the yarn was fused when it came into contact with the inner wall of the metal inner cylinder of the heating cylinder. It was possible to restart operation within a short time by removing it and inserting another metal inner cylinder.

[0017]

[Table 1]

[0018]

[Comparative Example 1] A polyester fiber yarn was manufactured in the same manner as in Example 4 except that a heating cylinder made of stainless steel and having an inner diameter of 45 mm was used, in which a metal inner cylinder was not inserted. Table 1 shows the results regarding operability. The heating zone temperature to 23
When the yarn was guided to the heating cylinder at the time of starting the operation while keeping the temperature at 0 ° C., when the yarn contacted the inner wall of the heating cylinder made of metal, it adhered and fused. In the yarn fused to the inner wall of the heating cylinder, several single fibers were melted and remained as a mass. When the operation was restarted in this state, the filaments were instantly entangled with the clumps of monofilaments that had melted and stuck, melted, and became a clump again. Therefore, a metal jig (a spatula and a rake) was inserted from the upper part of the heating cylinder to remove it, but it was difficult to completely remove the melted and fused single fiber.

As described above, in the case where the metal inner cylinder is not inserted, the filament adheres to the inner wall of the heating cylinder made of metal and is fused, so that the operation has to be temporarily stopped and the fused single fiber Removal was difficult and it took a lot of labor and time to restart the operation.

[0020]

The polyester fiber yarn producing apparatus of the present invention is, compared with the conventional producing apparatus, undrawn when the yarn is introduced into the heating zone at the start of operation or when the yarn is cut. Even if the yarn in this state comes into contact with the inner wall of the heating cylinder due to shaking or the like and is fused to the inner wall, the metal inner cylinder can be easily replaced, and stable operation can be performed.

[Brief description of drawings]

FIG. 1 shows a polyester fiber yarn manufacturing apparatus of the present invention,
Explanatory drawing which shows typically one Example which inserted the metal inner cylinder in the heating zone.

FIG. 2 is an explanatory view schematically showing a conventional polyester fiber yarn manufacturing apparatus.

[Explanation of symbols]

 1 yarn 2 cold wind 3 spinneret 4 cold air device 5 heating zone 6 heating wire 7 heat medium 8 metal heating cylinder 9 first take-up roll 10 second take-up roll 11 winding roll 12 metal inner cylinder

Claims (1)

[Claims] 1. A direct spinning and drawing apparatus in which a polyester fiber yarn melt-spun from a spinneret is once cooled and solidified below a glass transition temperature, subsequently introduced into a heating zone, heated and drawn, and then wound, in the heating zone. An apparatus for producing a polyester fiber yarn, characterized in that the yarn passage comprises a double heating cylinder in which a detachable metal inner cylinder is inserted in a metal outer cylinder.