JPH07109612A - 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 melt-spun from a spinneret 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 heating cylinder 8 whose inner surface has been coated with a resin 12, thus reducing the adhesion of the melt-spun fiber yarn to the inner surface of the heating 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. For example, in Japanese Examined Patent Publication No. 46-1932, melt-spun yarns are once cooled to a glass transition temperature or lower, 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, a device in which the yarn in an unstretched state does not adhere to the inner wall of the heated heating cylinder in the heating zone, and the yarn cannot pass through the heating zone, the problem that the operation is significantly hindered It is an object of the present invention to provide a polyester fiber yarn manufacturing apparatus which can be solved.

[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 a yarn passage in the heating zone is composed of a heating cylinder whose inner surface is coated with a resin.

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 wall surface of the heating cylinder is coated with resin on the inner surface. It is preferable that the inner wall surface of the heating cylinder is not a mirror surface but a satin finish. Examples of the resin used in the present invention include heat-resistant resins such as fluorocarbon resin, nylon 66 resin, epoxy resin, silicon resin, and wholly aromatic polyamide resin. In particular, the fluorine-based resin is preferable from the viewpoints of a small friction coefficient, heat resistance, low abrasion resistance, non-adhesiveness, and the like, and it is difficult to adhere even when the polyester fiber yarn is undrawn.

The method of coating the resin includes inserting a resin pipe,
Examples include coating and laminating. Regarding the method of inserting the resin pipe, if the outer diameter of the resin pipe is smaller than the inner diameter of the heating cylinder by 1 to 2 mm at normal temperature, the resin pipe can be easily inserted and removed, and the maintainability is good. Further, when the temperature of the heating zone is around 200 ° C., the resin pipe adheres to the inner diameter of the heating cylinder due to the difference in the coefficient of thermal expansion, and the air layer is eliminated, which is preferable because the heat conduction is good.

The thickness of the resin is preferably 3 mm or less when the resin pipe is inserted. Wall thickness is 3
If it is more than mm, the heat conduction becomes poor. coating,
In the case of a laminate or the like, the thickness is preferably 100 microns or more, more preferably 200 microns or more. The surface of the resin is preferably satin-like. In the polyester fiber yarn manufacturing apparatus of the present invention, the heating cylinder has two
Even at a temperature of around 00 ° C, the polyester fiber threads are not easily attached even when they are in an unstretched state or contact with the inner wall surface of the heating cylinder, and there is no problem that affects the operation. Will not be hindered.

Further, even if it comes into contact with the inner wall surface of the heating cylinder, it does not easily adhere, so that the inner diameter can be made thin and the thermal efficiency can be improved.

[0013]

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. 3, 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 12 in FIGS. 1 and 2 is a resin coating layer.

The polyester fiber yarn melt-spun from the spinneret is once cooled to below the glass transition temperature by the cool air blown from the cool air device, and then guided to the 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 metal heating cylinder, which serves as a thread passage, and the circumference of this metal heating cylinder is kept at a constant temperature by a heating medium heated by a heating wire. The structure is such that Although an electric heater is used as 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.

[0016]

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.
A pipe with a diameter of 39 mm made by Nichiasu Co., Ltd. made of fluorine resin (fluorine resin made by Daikin Industries, Ltd., product name Polyflon TFE) was inserted at a position 2.0 m away from the spinneret. An experiment was conducted with the installed polyester fiber yarn manufacturing apparatus. A resin having a thickness of 2 mm and a surface roughness of 6S was used.

A melt of polyester (viscosity ηSP / C = 0.64) was spun through 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 was guided to the heating zone at the start of operation, the yarn did not adhere even if it contacted the inner wall of the heating cylinder.

In Example 4, when the yarn was introduced into the heating zone at the start of operation, the yarn was in contact with the inner wall of the heating cylinder and adhered thereto. The attached threads could be easily removed by blowing compressed air with a gauge pressure of 5 kg / cm ² from the upper part of the heating cylinder. When the temperature of the heating cylinder is maintained at 225 ° C or lower, the fluororesin pipe is inserted into the inner surface of the heating cylinder, so even if the yarn comes into contact with the inner surface of the heating cylinder at the start of operation, the yarn will not It was not fused to the wall surface of the heating cylinder.

When the temperature of the heating cylinder was maintained at 230 ° C., the yarn was fused to the inner wall of the heating cylinder, so that the operation had to be temporarily stopped, but the attached yarn blows compressed air. When it was attached, it could be completely removed easily, and there was no hindrance to the restart of operation.

[0021]

[Table 1]

As shown in Table 1, according to the polyester fiber yarn producing apparatus of the present invention, the temperature of the heating zone is 200 ° C.
To 225 ° C. is preferable, and the polyester fiber yarn having good operability and good physical properties can be obtained.

[0023]

[Examples 5 to 8] A heating cylinder made of metal was vertically divided into two, and the surface of the cylinder having a half-moon-shaped cross-section was finished to form a cylinder, and then the heating zone coated with a fluororesin on the inner wall surface was used. A yarn was produced in the same manner as in Examples 1 to 4 except that it was used. The coated resin is a product name of Daikin Industries, Ltd.
The thickness of polyflon TFE and resin is 200 μm, and the surface roughness is 6S.

The temperature of the heating zone was maintained at 175 ° C. (Example 5), 200 ° C. (Example 6), 225 ° C. (Example 7) and 230 ° C. (Example 8), spun and wound.
Table 2 shows the results regarding operability. Examples 5 to 7
When the yarn was introduced into the heating zone at the start of operation, the yarn did not adhere even if the yarn contacted the inner wall of the heating cylinder.

In Example 8, when the yarn was introduced into the heating zone at the start of operation, the yarn was in contact with the inner wall of the heating cylinder and adhered thereto. The attached threads could be easily removed by blowing compressed air with a gauge pressure of 5 kg / cm ² from above the heating cylinder. When the temperature of the heating cylinder is kept below 225 ° C, the inner surface of the heating cylinder is coated with fluororesin, so even if the yarn comes into contact with the inner surface of the heating cylinder at the start of operation, the yarn will not be heated. Did not adhere to the wall surface of.

When the temperature of the heating cylinder was kept at 230 ° C., the yarn adhered to the inner wall of the heating cylinder, so that the operation had to be temporarily stopped, but the attached yarn was blown with compressed air. It could be easily and completely removed, and there was no hindrance to the restart of operation.

[0027]

[Table 2]

As shown in Table 2, according to the polyester fiber yarn producing apparatus of the present invention, the temperature of the heating zone is 200 ° C.
To 225 ° C. is preferred. Under these conditions, a polyester fiber yarn having good operability and good physical properties can be obtained.

[0029]

[Comparative Examples 1 to 4] Polyester was prepared in the same manner as in Examples 1 to 4 except that a heating cylinder made of stainless steel and having an inner diameter of 45 mm was used, and the inner surface of the heating cylinder was not particularly coated with resin. Fiber yarn was produced. Table 3 shows the results regarding operability.

In Comparative Example 1, the temperature of the heating zone was maintained at 175 ° C. At the start of operation, even if the yarn contacted the inner wall when the yarn was guided to the heating cylinder, the yarn did not adhere to the inner wall of the heating cylinder of the metal pipe. In Comparative Examples 2 to 4, the temperature of the heating zone was maintained at 200 ° C, 225 ° C, and 230 ° C, respectively. At the start of the operation, when the yarn was guided to the heating cylinder, the yarn contacted the inner wall of the heating cylinder made of metal and was adhered and welded. The thread welded to the inner wall of the heating cylinder has a gauge pressure of 5 kg from the top of the heating cylinder.
It could not be completely removed even by blowing air with a pressure of / cm ² , and some lumps of melted single fibers remained. 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 single fiber melted and welded.

As described above, in Comparative Examples 2 to 4, since the yarn adhered to and welded to the inner wall of the heating cylinder made of metal, the operation had to be temporarily stopped, and it was difficult to remove the welded single fiber. Therefore, it took a lot of labor and time to restart the operation.

[0032]

[Table 3]

[0033]

The polyester fiber yarn producing apparatus of the present invention, as compared with the conventional metal heating tube producing apparatus, moves the yarn to the heating zone at the start of operation or when the yarn is cut. When the yarn is introduced, even if the unstretched yarn comes into contact with the inner wall of the heating cylinder due to shaking or the like, stable operation can be performed without sticking or welding to the inner wall. The inner diameter can be reduced, and the thermal efficiency can be improved.

[Brief description of drawings]

FIG. 1 shows a polyester fiber yarn manufacturing apparatus of the present invention,
Sectional drawing which shows typically one Example which inserted the pipe | tube of a fluororesin into the heating zone.

FIG. 2 is a cross-sectional view schematically showing an embodiment of the present invention in which a heating zone is coated with a fluororesin.

FIG. 3 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 heating medium 8 metal heating cylinder 9 first take-up roll 10 second take-up roll 11 winding roll 12 resin coating layer

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 passage of the yarn comprises a heating cylinder whose inner surface is coated with resin.