JPH10273811A - Production of synthetic fiber and synthetic fiber producer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To stabilize the quality of the spinning oil in the melt-extrusion spinning process, uniformly applying the spinning oil to the yarn and improve the spinning operability with filament or yarn breakage reduced. SOLUTION: A thermoplastic polymer is molten, the molten thermoplastic polymer is extruded out from the spinneret to form a yarn and the yarn is treated with a spinning oil and taken up around a winder. When the spinning oil is applied to the yarn, the oil application temperature is set lower than the ambient one.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a method for producing synthetic fibers. More specifically, the present invention relates to a method for producing a synthetic fiber of excellent quality by making the amount of the oil agent attached uniform, preventing the oil agent from scattering, and stabilizing the oil agent quality in melt spinning.

[0002]

2. Description of the Related Art Conventionally, in forming a fiber by melt spinning, a spinning oil has been applied to the yarn in order to take up the yarn at a high speed and to improve the passability in a subsequent process. .

[0003]

However, in the melt spinning, a high temperature is required to melt the thermoplastic polymer, and in particular, when a multifilament yarn is produced, it is required to be drawn at a high speed. There has been a problem that the accompanying airflow is also increased and the temperature of the oil agent in the oil agent application section rises to lower the viscosity of the oil agent or adversely affect the quality of the oil agent.

An object of the present invention is to prevent deterioration of the quality of an oil agent and to improve operability in the production of synthetic fibers.

[0005]

Means for Solving the Problems The method for producing a synthetic fiber of the present invention has the following constitution to solve the above-mentioned problems.

That is, the thermoplastic polymer is melted, the melted thermoplastic polymer is discharged from a spinneret to form a yarn, an oil agent is applied to the yarn, and the yarn is taken off.
A method for producing a synthetic fiber yarn, characterized in that, when an oil agent is applied to the yarn, the oil agent temperature is set to an ambient temperature or lower.

[0007] Further, an apparatus for producing a synthetic fiber according to the present invention has the following configuration to solve the above-mentioned problems.

That is, the present invention is a synthetic fiber manufacturing apparatus including at least a spinneret, an oil agent supply section, a cooling section, and a winding device, wherein the oil agent supply section is insulated. .

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION The method for producing a synthetic fiber of the present invention will be described below.

According to the present invention, a thermoplastic polymer is melted, the melted thermoplastic polymer is discharged from a spinneret to form a yarn, an oil agent is applied to the yarn, and the yarn is taken off.
When an oil agent is applied to the yarn, the oil agent temperature is set to an ambient temperature or lower.

In the present invention, a thermoplastic polymer is used. As the thermoplastic polymer in the present invention, for example, polyethylene terephthalate, polyamide and the like can be used.

The above-mentioned thermoplastic polymer is melted. The melting temperature can be appropriately selected according to the thermoplastic polymer.
The range of 0 to 300 ° C. is preferable from the viewpoint of the required melting temperature. In the case of polyethylene terephthalate, the range of 280 to 310 ° C. is preferable from the viewpoint of the required melting temperature.

The spinneret used in the present invention may be appropriately selected and used depending on the fineness of the synthetic fiber to be produced, the number of single fibers, and the like.

In the present invention, a thermoplastic polymer is discharged from a spinneret to form a yarn, and an oil is applied to the yarn to be taken off.

In the present invention, an oil agent is used. If no oil agent is used, there is a problem that the operability is reduced and the passage property in the subsequent process is reduced.

As the oil agent used in the present invention, an oil agent generally used for synthetic fibers is used.

The take-off speed in the present invention refers to the surface speed of the first roller immediately below the spinneret. The take-up speed is preferably in the range of 2500 to 4500 m / min.

The thermoplastic polymer discharged from the spinneret is cooled by a cooling device, but has a high melting temperature. If the take-up speed is high, the accompanying airflow becomes large, and the thermoplastic polymer is placed under the spinneret. The temperature near the yarn guide for applying the oil while bundling the yarns may also increase. Therefore, the temperature of the oil between the oil supply device and the yarn guide also increases.

As the temperature of the oil increases, the viscosity decreases, the adhesion to the yarn decreases, and the oil scatters due to the accompanying airflow. Further, depending on the type of the oil agent, there arises a problem that the emulsion is separated due to a rise in temperature.

In the present invention, when applying an oil agent to the yarn,
The temperature of the applied oil agent is caused to adhere to the yarn at an ambient temperature or lower. Then, in order to maintain the temperature of the applied oil agent at or below the ambient temperature, for example, spinning is performed while insulating the yarn guide and the oil agent supply device from the ambient temperature.

Next, an apparatus for producing a synthetic fiber according to the present invention will be described with reference to the drawings.

FIG. 1 is a schematic front view of an apparatus for producing synthetic fibers according to the present invention. 1 is a spinneret having a plurality of discharge holes. 2 is a cooling device for cooling the discharged yarn, and 3 is a yarn guide for applying oil while converging the yarn. An oil supply pipe is connected to the yarn guide from an oil supply device. 4 is a guide for holding the thread. Reference numeral 5 denotes a spinning take-up roller that is taken up and then taken up on a drum by a take-up device.

FIG. 2 is a schematic partial view from the oil supply device to the yarn guide for applying the oil while converging the yarn, as viewed from the side.

Reference numeral 6 denotes a support, 7 denotes an oil supply pipe, and 8 denotes an oil supply device. FIG. 3 is a drawing in which the oil introduction pipe is cut into a circle. 9 is an oil supply tube, 10 is a protection tube around it, and 11 is a heat insulating material. In FIG. 2, the oil metering section (gear pump) of the oil agent supply device is also covered with a heat insulating material. Usually, only an oil supply tube such as 9 is used. However, for example, when the number of filaments of the synthetic fiber to be manufactured is large, the apparatus of the present invention is particularly effective because the amount of heat brought by the yarn is large. As a method of heat insulation, any method may be used, such as using a styrene foam heat insulating material, or water cooling with a double supply pipe.

[0025]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to embodiments.

[Example 1] Using a polyester chip, a die having 48 discharge holes, and a take-up speed of 3
500 m / min, oil adhesion 0.45%, spinning temperature 2
Melt spinning was performed at 90 ° C. The discharge amount and the presence or absence of the heat insulating cover were changed. The synthetic fiber manufacturing apparatus of FIG. 1 was used.

In order to keep the temperature of the applied oil agent below the ambient temperature, the oil agent supply device is covered with foamed styrene, and the oil agent supply tube shown in FIG.
m, a protective tube having a diameter of 10 mm, and a styrene foam insulating material having a diameter of 15 mm were used.

As a comparative example, the cover of the oil supply device was removed, and only the oil supply tube having a diameter of 6 mm was used.

The results are shown in Table 1 below.

[0030]

[Table 1] [Example 2] Using a polyester chip, 96 (48
× 2) Melt spinning was carried out using a die having two discharge holes with two yarns / one die. The conditions of the take-up speed, the amount of oil agent attached, and the spinning temperature were the same as in Example 1. The discharge rate and the presence / absence of the heat insulating cover were changed. The configuration from the oil supply device to the yarn guide for applying the oil while converging is the same as that shown in FIG.

The method of insulating the applied oil is to cover the oil supply device with styrene foam, the diameter of the oil supply tube of the oil supply pipe is 6 mm, the diameter of the protection tube is 10 mm, and the diameter of the insulation material of the styrene foam is 15 mm. It was used.

As a comparative example, the cover of the oil supply device was removed, and only the oil supply tube having a diameter of 6 mm was used.

Table 2 shows the results.

[0034]

[Table 2]

[0035]

According to the present invention, in the melt spinning, the quality of the oil agent can be stabilized, the oil agent can be uniformly applied to the yarn, the yarn breakage can be reduced, and the operability can be improved.

[Brief description of the drawings]

FIG. 1 is a schematic front view schematically showing an example of an apparatus for producing a synthetic fiber of the present invention.

FIG. 2 is a schematic partial view schematically showing an example of a part of the synthetic fiber manufacturing apparatus of the present invention.

FIG. 3 is a schematic cross-sectional view schematically showing an example of an oil agent introducing pipe used in the synthetic fiber manufacturing apparatus of the present invention.

[Description of Signs] 1: Spinneret 2: Cooling device 3: Thread guide 4: Guide 5: Roller 6: Strut 7: Oil agent introduction tube 8: Oil agent supply device 9: Oil agent supply tube 10: Protective tube 11: Heat insulating material

Claims (4)

[Claims] 1. A thermoplastic polymer is melted, the melted thermoplastic polymer is discharged from a spinneret to form a yarn, an oil agent is applied to the yarn, and the yarn is taken off. A method for producing a synthetic fiber yarn, characterized in that, when an oil agent is applied, the temperature of the applied oil agent is set to an ambient temperature or lower. 2. The method for producing a synthetic fiber yarn according to claim 1, wherein the take-up speed is 2500 to 4500 m / min. 3. The method according to claim 1, wherein the applied oil is insulated from the atmosphere. 4. An apparatus for producing synthetic fibers, comprising at least a spinneret, an oil supply section, a cooling section, and a winding device, wherein the oil supply section is insulated.