JPS6346165B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a spinning device. The object thereof is to provide a spinning device for controlling the molecular orientation of the spun yarn by influencing the molecular orientation of the spun yarn using a magnetic field.

Traditionally, in order to produce man-made fibers, the method has been to first obtain undrawn yarn with little molecular orientation in the spinning process, and then draw and heat treat the undrawn yarn to orient and crystallize it. There is.

In recent years, a method has been developed in which the spinning speed is set to a relatively high speed of 3000 to 4000 m/min to produce partially oriented yarn (POY) with a relatively high degree of orientation, and then a slight stretching and false twisting are performed simultaneously (POY- DTY processing method)
is beginning to be commercialized.

Furthermore, recently, ultrahigh-speed spinning with a winding speed of 5000 m/min or more has been studied in an attempt to obtain highly oriented yarn in one step that does not require drawing treatment in the post-process.

However, although the overall molecular orientation of the fibers obtained by these high-speed spinning and ultra-high-speed spinning methods reaches a considerable level, the molecular disorder in the amorphous portion makes it difficult to draw conventional undrawn yarn. There has been a tendency for the fibers to be larger than those obtained by

On the other hand, undrawn yarn obtained by the usual melt spinning method is subjected to so-called zone drawing, in which the yarn is rapidly heated and cooled repeatedly while applying a large tension. There is a method for producing strong fibers (for example, Journal of the Japan Institute of Fiber Science, Vol. 38, No. 6, p. 257 (1982)). This method cannot be said to be an energy-saving silk spinning method since heating and cooling are repeated. Moreover,
The physical properties of zone-stretched and zone-heat treated fibers are as follows:
There is a limit that depends on the orientation state of the undrawn yarn at the initial spinning stage.

In this way, controlling the molecular orientation of spun yarn has become an extremely important technology.

On the other hand, the following techniques are conventionally known as techniques for controlling the orientation of molecules by applying a strong magnetic field.

First, it is known that when a certain type of polymer has a solution viscosity in a low viscosity range of several poise to several tens of poise in an appropriate solvent, the polymer will be oriented in a certain direction when a magnetic field is applied (for example, Magazine, No. 35
Vol. 11, p. 337 (1979)). According to the description in this document, a solution of polymers to be oriented is in a static state in a constant magnetic field, and the polymers are only oriented when exposed to the magnetic field for a long time (for example, several minutes or more). It's just being observed. Further, the strength of the magnetic field described in the above-mentioned literature is from several kilogauss to only 25 to 35 kilogauss at most.

It is also known that oriented polymers can be synthesized by holding liquid crystalline monomers statically in a strong magnetic field and polymerizing them while oriented (for example, Journal of Polymer Science, Polymer Letters Edition). (J.Polym.Sci., Polym.
Letters Ed.) Volume 13, Page 243 (1975)).

Furthermore, it is also known that it is possible to orient polymers exhibiting nematic liquid crystal by applying a magnetic field with a strength of less than 15 kilogauss for several minutes or more in a medium-low viscosity range of several hundred poise or less at high temperatures. (For example, Journal of Polymer Science (J.Polym.Sci., Polym.Phys.Ed.) Volume 20, No. 975
(1982)).

However, the examples described in these documents are
All of these methods control the orientation of monomers, polymers, etc. by applying a magnetic field to a medium-to-low viscosity state that is held static for a long time of several minutes or more.

As a result of repeated studies on applying a magnetic field during the spinning process of artificial fibers, the present inventors discovered that a strong magnetic field can be applied to a polymer fluid with high solution viscosity or melt viscosity discharged from a spinneret for a short period of time, within a few seconds. The present invention was achieved by successfully developing a device that can control the molecular orientation of spun yarn by applying a magnetic field.

That is, in the present invention, in a magnetic body whose parts are bent so as to face each other, one of the facing parts is used as a spinneret, and a thread passing hole is formed in the other of the facing parts, so that both facing parts are bent. This spinning device is characterized in that a magnetic field is applied in a direction substantially parallel to the spun yarn between sections.

Hereinafter, the present invention will be explained with reference to the drawings.

FIG. 1 shows an example of the device of the present invention,
1 is a spinning pack; 2 is a magnetic body bent such that both ends thereof face each other; the upper end constitutes a spinneret 3; the lower end has a yarn passing hole 4 through which the spun yarn Y passes; is formed. 5 and 5' are take-up godet rollers, and 6 is a winding device. The spinneret 3 has a polymer introduction hole 7 like a normal spinneret.
The yarn Y discharged from this is taken up at a constant spinning speed by take-up godet rollers 5, 5', and wound up by a winding device 6.

The spinning pack 1 is composed of filters 9, 9', material 10, etc., like a normal pack.
All materials are non-magnetic (eg, brass, aluminum, SUS-304-L, etc.).

The magnetic field is generated between the upper end of the magnetic body 2 constituting the spinneret 3 and the lower end of the magnetic body 2 where the thread passing hole 4 is formed. This is done by passing current from a power source 13 through a coil 12 wound around the intermediate portion 11.

FIG. 2 shows various embodiments of the magnetic field generating portion in the device of the present invention.

First, the running direction of the spun yarn Y and the vector direction of the magnetic field (indicated by the dotted line in the figure) generated between the pair of magnetic poles of the magnetic body 2 (spinneret 3 and yarn passage hole 4 forming part) are The mutual relationship is as shown in FIG.
In some cases, a current is passed from the DC power source 13 to the coil 12 wound around the coil 12 to generate a magnetic flux line in the same direction as the running direction of the spun yarn Y, and as shown in b, a current is applied from the DC power source 13' in the opposite direction to that in case a. In some cases, a current is applied to generate lines of magnetic flux in the direction opposite to the traveling direction of the spun yarn Y. Also, as shown in c, the direction of the magnetic flux lines may be changed over time using an AC power source 13''.Furthermore, as shown in d, the running direction of the spun yarn Y and the direction of the magnetic flux lines may be at any angle less than 45 degrees. In some cases, it is tilted to form an angle θ. All of these fall under the category of ``applying a magnetic field in a substantially parallel direction to the spun yarn.''

On the other hand, the coil wound around the intermediate portion 11 of the magnetic body 2 is divided into a plurality of coils 12, 12', 12'' as shown in e, and each has a separate power source 13a, 13b,
13c can be provided. Further, as shown in f, a DC power source 13, 13' and an AC power source 13'' having different current directions are connected to a plurality of divided coils 12, 12', 12'', respectively.
It is also possible to partially change the direction of the current flowing through 12''.

Next, the strength of the magnetic field generated by the magnetic field generator will be specifically explained. FIG. 3 is a diagram showing the relationship between the strength of the magnetic field generated by the magnetic core type magnet and time. The strength of the magnetic field in the thread path of the magnetic field generator may be constant as shown in FIG. 3a, or may vary with time as shown in FIG. 3b. Furthermore, it may change stepwise or with a tendency as shown in c. Further, as shown in FIGS. 2a, b, and c, it may be a direct current magnetic field in which the vector direction of the magnetic field is constant, or alternatively, it may be an alternating magnetic field in which the vector direction of the magnetic field changes. These are arbitrarily selected and used depending on the purpose of controlling the molecular orientation of the spun yarn.

The distance between the forming part of the yarn passing hole 4 and the spinneret 3 is arbitrary, but if the distance is too large, a large current must be passed to maintain the strength of the magnetic field. The length is preferably 30 cm or less, more preferably 15 cm or less.

In the above explanation, an example is shown in which an integrally molded product made of the same material is used as the magnetic body 2.
1 can also be made of different magnetic materials. Magnetic materials are usually nickel, cobalt,
Iron or the like is used, and iron is particularly preferable for the spinneret 3 portion.

In the magnetic field generator of the present invention, the maximum strength of the magnetic field applied to the spun yarn is desirably 10 kilogauss or more, preferably 15 kilogauss or more. However, the optimum value of the magnetic field strength varies depending on the type of polymer to be spun and the spinning conditions.

In the above explanation, an example of a magnetic material core type magnet with a coil wound around a part of the magnetic material was described as an example, but the present invention is not limited to this, and any magnet can be used depending on the purpose. I can do it.

The spinning device of the present invention may be a normal spinning device that winds the yarn discharged from the spinneret by running it in the direction of gravity, that is, from top to bottom, or vice versa. It may be a spinning device that takes the spun yarn upward from a spinneret provided below. Furthermore, a spinning device may be used in which the spun yarn from the spinneret is moved horizontally and taken up.

The spinning apparatus of the present invention can also be applied to conjugate spinning, mixed spinning, etc. It can also be applied to spinning yarns with irregular cross sections, hollow cross sections, etc.

In the spinning device of the present invention, it is also possible to use the magnetic field generating device in combination with other energy adding devices or fiber processing devices. For example, as another energy adding means, an electric field generator or another magnetic field generator in a direction perpendicular to the yarn running direction may be used together with the magnetic field generator of the apparatus of the present invention to control the molecular orientation of the spun yarn. can be made more reliable and effective.

Furthermore, it is also possible to form fibers by combining various fiber processing means such as an interlacing nozzle or a crimping device next to the magnetic field generating device.

As explained above, the spinning device of the present invention is equipped with a magnetic field generating device that applies a magnetic field in a direction substantially parallel to the spun yarn between the spinneret and the magnetic poles facing it. , the molecular orientation of the spun yarn can be easily controlled.

[Brief explanation of the drawing]

Fig. 1 is a schematic diagram schematically showing an example of the device of the present invention, Fig. 2 is a diagram showing various embodiments of the magnetic field generator used in the device of the present invention, and Fig. 3 is a diagram showing the magnetic field used in the device of the present invention. It is a graph showing the relationship between magnetic field strength and time in a generator. 2 ... Magnetic material, 3... Spinneret, 4... Yarn passage hole,
12, 12', 12''...Coil.

Claims (1)

[Scope of Claims] 1. In a magnetic material whose parts are bent so as to face each other, one of the facing parts is used as a spinneret, and the other of the facing parts is formed with a thread passage hole, and both of the facing parts are bent to face each other. A spinning device characterized in that a magnetic field is applied in a substantially parallel direction to a spun yarn between opposing parts. 2. The spinning apparatus according to claim 1, wherein the magnetic core type magnet generates a DC magnetic field. 3. The spinning apparatus according to claim 1, wherein the magnetic core type magnet generates an alternating magnetic field. 4. The spinning apparatus according to claim 1, wherein the magnetic core type magnet has a maximum magnetic field strength of 10 kilogauss or more.