JPS58136816A - Preparation of highly oriented theremoplastic polymeric fiber - Google Patents

Abstract

PURPOSE:To obtain highly oriented thermoplastic polymeric fibers having a good winding form under a low winding tension, by collecting and oiling plural filaments extruded through a spinneret at a point near the spinneret with an oiling nozzle guide, and winding the resultant filaments at a point near the spinneret. CONSTITUTION:A melt spinnable thermoplastic polymer, e.g. a polyester, polyamide or polyolefin, is melt spun through a spinneret 2 and a solidified to give plural filaments 4, which are then collected and oiled by an oiling nozzle guide 11 at a position within 1m below the extrusion surface of the spinneret 2. The resultant filaments 4 are then wound by a winder 7 at a position within 2.5m below the extrusion surface of the spinneret 2. The winding tension can be controlled at <=0.5g/denier, and the filaments 4 can be wound favorably at >=5,000m/ min winding speed.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for producing highly oriented fibers made of a thermoplastic polymer using a high-speed spinning method.

To explain in more detail, highly oriented fibers made of thermoplastic polymers having sufficient practical properties can be produced using only a melt spinning process without going through a drawing process at a spinning speed of 5,000 m/min.
The present invention relates to a method for manufacturing by high-speed spinning of more than 1 minute.

For example, Japanese Patent Publication No. 35-3 describes how thermoplastic polymers can be melt-spun and wound at high speed to obtain fibers that have practically sufficient properties even if the drawing step is omitted.
Publication No. 104, or Journal of the Japan Textile Society, Vol. 8g, Vol. 33, A
5, T2O8 page, etc. According to the above-mentioned literature, for example, in the case of polyethylene terephthalate, when the spinning speed is about 5,000 m/min or higher, the resulting fibers become close to fully oriented fibers (conventional drawn fibers). Generally, in the conventional melt spinning method, for example, a spinning apparatus shown in FIG. 1 is used,
The molten polymer is extruded through a spinning head and spinneret 2, and a large number of fibers 4 thus formed are cooled and solidified by cooling air 3 after passing through a heat retention area 5. through to the oiling roll,
At this point, the fibers are focused, oiled at the same time, and finally wound up by a winder 7. The present inventors have found that in such conventional methods, when the winding speed is increased to 5,000 m/min or higher, on the other hand, single yarn breakage and yarn breakage during spinning increase, resulting in a significant decrease in operability. This was revealed through a study of In addition, as the spinning speed increases, the tension applied to the fibers at the spinner's base increases, and accordingly, in the method of winding the fiber bundle directly without using a godet roll, the winding tension increases. Normal winding operation has become impossible. In order to solve these problems, in the conventional spinning method,
We have investigated various spinning conditions (e.g., spinning temperature, spinning draft, cooling air conditions, etc.), but such modifications to normal operating conditions will improve the stability of spinning and increase the winding tension in a method that does not use a godet roll. It was not possible to reduce the

A proposal regarding a high-speed spinning method that does not use a godet roll is disclosed in Japanese Patent Application Laid-Open No. 12,327/1983.

This method uses a spinning apparatus such as that shown in FIG. 2, in which the molten polymer is extruded from spinneret 1 through spinneret 2 for spinning. A large number of fibers 4 thus formed are cooled and solidified by the cooling air 3 and guided to a false twisting nozzle or interlacer 10, where they are given a swirling force. The fibers thus swirl and converge above the false twist nozzle or interlacer 10. This is the M of this method.
This is a characteristic of l. Next, the bundled fibers 4 are wound up by a winder 7 at a position 3 to 6 m below the spinning direction of the spinneret. This is the feature of WJ2 of this method.

However, with this method, there are large fluctuations in the swirling properties of the fibers due to the false twisting nozzle or interlacer, it is difficult to fix the fiber convergence point, and the tension applied to the fibers fluctuates greatly, resulting in frequent single yarn breakage and thread breakage. . Furthermore, the phenomenon of melt layering between single fibers cannot be completely eliminated. On the other hand, the fibers are bundled between the spinneret and a take-up point by a take-up roll, and after being taken up by a take-up roll at a position within 2.5 m below the spinning surface of the spinneret, the fibers are taken up by a take-up roll. The method of winding with
125,721 +j This 4 is proposed in the bulletin!
! The proposed method is to produce ultrafine fibers with a single fiber fineness of 0.57" Ale or less at a spinning speed of 4,500 m/min or less. However, the above-mentioned publication states that
At spinning speeds of 1 minute or more, this method has been described in many cases.
) There is no mention or suggestion in L1 of the effectiveness of a method that does not use roll).

One advantage of the present invention is that when spinning a thermoplastic monomer at a spinning speed of 5,000 m/min or more without using a godet roll, there are extremely few single fiber breakages or thread breakages, and excellent spinning stability is achieved. It is an object of the present invention to provide a method for producing highly oriented thermoplastic polymer fibers which can control the winding tension to 0.57/a or less and provide an excellent wound form.

In order to achieve the above object, the inventors of the present invention conducted extensive research and found that a plurality of spun fibers are focused by a lubricating nozzle guide at a point as close to the spinneret as possible, and at the same time, The present inventors have discovered that the object of the present invention can be achieved by lubricating the fibers, and then winding the fibers at a point as close as possible from the spinning point. That is, the method for producing highly oriented thermoplastic polymer fibers of the present invention involves melting a thermoplastic polymer, spinning this melt from a melt spinneret, and spinning several spun fibers through a godet roll. 5.01 by Il winder without using
) When winding at a speed of Om7 minutes or more, the plurality of spun fibers are focused by a lubricating nozzle guide at a position within 1 m below the spinning direction of one can of spinning, and this is lubricated. Next, this fiber bundle is wound up by a pre-winding winder at a position within 12.5 m of the spinning surface of one spinning spinneret. fj
p! The device L1 shown in FIG. 3 is an example of a device for achieving the present invention.

In the method of the present invention, #r1i181 of thermoplastic polymer
The body is melt spun and the resulting fibers are wound up without the use of godet rolls at winding speeds of over 5,000 m/min. A spinning method that does not use a godet roll is, for example, as shown in FIG. 3, in which the fibers spun from the spinneret 2 are blown with cooling air 3 in a cooling zone, and the solidified fibers 4 are placed under the cooling zone and are rolled into nine turns. This is a spinning method in which the yarn is directly taken up and wound by a take-up machine 7. The winding position indicates the winding of the winder 7 at the center 7b of the bin 7a. The thermoplastic polymer that can be used in the method of the present invention is:
Melt-spun polymers such as polyesters, polyamides, and polyolefins, to give specific examples of polyesters include polyethylene terephthalate and copolymers thereof, and polyamides include nylon 6, nylon 66, and polyolefins. As for polypropylene, etc. These polymers may contain additives such as a heat stabilizer, a dissipating agent, and a Teiden spinning agent, if necessary.

In the method of the present invention, for example, in the apparatus shown in FIG. 3, a plurality of fibers 4 spun from a spinneret are collected by a refueling nozzle guard 11 at a position within 1 m below the spinning surface of the spinneret. It is necessary to refuel it at the same time. The refueling nozzle guide 11 has a V-shape or a U-shape at the tip, for example, as shown in FIG. 4A and WI4B.
It has a notch 12 in the shape of a character, and a nozzle 13 at the bottom of the notch 12 in the shape of a square or U. The nozzle 13 is
It communicates with a metering gear pump 15 for supplying oil via a supply line 14 and a hose 16. This guide 11
guides and focuses the fibers, and at the same time the nozzle 13
It also has the function of supplying the finishing oil measured and sent by the gear 4 ring 15. Here, it is necessary to bundle the fibers in order to reduce the air resistance applied to the fibers and to moderate the winding tension of the fiber bundle. When the fibers are focused more than 1 m below the spinning surface of the spinneret, the winding tension is reduced to the ratio required to maintain a good winding shape ÷ 0.597.
It becomes difficult to set the value to d or less. The focusing position is preferably as close to the spinneret as possible, but must be selected at a position where soft fibers do not break during the fiber formation process. Preferably, it is preferable to focus at a position of 0.5 to 1 m below the spinning surface. Further, in the method of the present invention, it is necessary to bundle the fibers using a nozzle guide for oil supply and to simultaneously supply oil to the fiber bundle. Even if a fiber guide different from the lubrication nozzle guide as described above is used, it is possible to bundle the fibers, but lubrication is not possible. If the fibers are bundled together, the spun fibers will not be sufficiently cooled, and fusion and adhesion between single fibers will be avoided, which is dangerous. However, by applying a finishing oil to the fibers at the same time as the fibers are focused using a lubricant nozzle guide, cooling is achieved at the same time as the fibers are focused, and problems such as fusion and adhesion between single fibers do not occur. . Of course, the oil finishing operations necessary for fiber production are also accomplished at the same time. (9) In the method of the present invention, it is necessary to wind up the fiber bundle at a position within 2.5 m from the spinning surface of the spinneret. If the winding position exceeds 2.5 m, spinning operation is possible, but due to air resistance, the winding tension generated on the upper part of the fiber exceeds 0.5.9/d, making it impossible to obtain a normal winding shape. . In order to obtain a good winding appearance, the winding position is preferably within 2 m below the spinning surface of the spinneret. If necessary, the fiber bundle may be subjected to an entanglement treatment using an air agitation method between the refueling nozzle guide and the winding position.
Lubricating nozzle guide, winding machine used in the method of the present invention,
Any of the other equipment necessary for melt spinning may be known. The finishing oil used in the uninvented method may be either an emulsion type or a straight type, and its components may be , may be a known one.

The method of the present invention makes the necessary melt spinning equipment extremely compact9, which not only saves factory space but also allows high yields of high quality, highly oriented thermoplastic monomer fibers to be obtained. Became. In addition, the obtained fibers can be conveniently used for fabrics or laminated fabrics without being stretched.
Moreover, it can also be used as a supply system for stretching false twisting.

The present invention will be further explained below with reference to Examples.

Example 1 Polyethylene laphthalate with [η)=0.63 was prepared by using the melt spinning apparatus shown in FIG.
Melt spinning at a winding speed of 5,500 m/min. At this time, 20% emulsion spray was used as the finishing oil, and the adhesion ratio of the pure oil was O and S* relative to the weight of the fibers. The spinneret is 0.
The nine-fiber bundle wound was 50 d/24 f, and the spinning temperature of the polymer was 290°C. The spinning conditions etc. are shown in Table 1.

Margin below, nozzle guide position = spinning surface of spinneret and nozzle 1
1 Distance between positions Winding point position - Spinning direction of spinneret and distance between winding positions Spinning condition In terms of conditions,
Spinning was carried out without refueling the refueling nozzle 1. 2. At that time, the experimental flattening 3. In both cases of No. 4, the single fiber excitation M was severe and no mono-rich filament yarns could be obtained.

Example 2 Nylon 66 with a relative viscosity of 40 was mixed with B7. using the apparatus shown in FIG. Ivl9 at oum/min. .

The spinneret used had a hole diameter of 0.23wx and 12 holes, and was used to spin a filament yarn of 40d/12f.

At this time, the spinning temperature was 290°C, the oiling nozzle guide was at U, 7 tn, finishing oil of Emul Noyon Taigu was applied, and the spinning was wound at a position 2 m below the spinning direction of the spinneret. . The spinning condition is good, and the winding tension is 0.4.9/d.
It showed good winding appearance. No adhesion or fusing layer was observed between the single yarns of the wound filament.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of a conventional melt spinning apparatus for implementing a melt spinning method that does not use a godet roll, FIG. 2 is an explanatory diagram of another conventional melt spinning apparatus, and FIG. 3 is an explanatory diagram of another conventional melt spinning apparatus. , is an explanatory diagram of an example of a melt spinning apparatus for carrying out the method of the present invention, ! ! Figure 44A is a side explanatory view of the refueling nozzle guide device used in the method of the present invention, and Figure 4B is a side view of the refueling nozzle guide device shown in Figure 4A.
1 is an explanatory diagram. 1... Spinning head, 2... Spinneret, 3... Cooling air, 4... Fiber, 5... Heat retention area, 6... Oiling roll, 7... Winding machine, 7m ...Take-up l bottle, 7
b... Take-up bottle center, 8... Column, 9...
Floor surface, 10... false twist nozzle or interlace, 11
...Refueling nozzle guide, 12... Guide notch, 13... Nozzle, 14... Refueling pipe line, 15...
・Mei Sumigapong, 16...Hose. Asahi Kasei Kogyo Co., Ltd. Patent Attorney Akira Aoki Patent Attorney Kazuyuki Nishimen Patent Attorney Anyuki Yamaguchi

Claims (1)

[Claims] 1 A thermoplastic polymer is melted, the melt is spun from a melt spinneret, and a plurality of spun fibers are formed into a body...
5 by direct winder without using trawl
When winding at a speed of ,000 m/min or more, the plurality of spun fibers are brought by a lubricating nozzle guide at a position within 1 m below the spinning surface of the spinneret, and the fibers are lubricated. and then winding up this fiber bundle with the winder at a position within 2.5 m below the spinning surface of the spinneret, a method for producing highly oriented thermoplastic polymer fibers. . 2. The method of claim 1, wherein the thermoplastic polymer is polyester, polyamide, or polyolefin.