JP2008223205A - Method and apparatus for producing organic spun yarn - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a production method and a production apparatus for producing a spun yarn from microfilaments obtained by an electrostatic spraying method. <P>SOLUTION: A fixed accumulation body is bound to a rotating accumulation body, to which earthing is applied, by an organic fiber formed by carrying out electrostatic spraying of a spinning liquid in which organic polymerizable substance is dissolved toward an intermediate position of two accumulation bodies. Then, when the fixed accumulation body is gradually separated from the rotating accumulation body from the above state, twist is applied to the organic fiber peeled from the rotating accumulation body in turn from a part of fiber close to the fixed accumulation body and formed as one spun yarn. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a production method and a production apparatus for producing an organic spun yarn from an organic polymerizable substance using an electrostatic spray method.

  The electrostatic spraying method is a kind of fiber manufacturing method using a high voltage, and is characterized in that it can manufacture uniform and fine fibers. In this electrostatic spraying method, an electrostatically sprayed organic substance solution is solidified by receiving solvent removal due to charge repulsion.

  As a fiber manufacturing method using such an electrostatic spraying method, Patent Document 1 discloses a method for manufacturing a fiber structure from a zein protein solution.

  Patent Document 2 discloses a step of supplying a spinning polymer solution to a spinning space, a step of supplying a first air stream in a direction of supplying the polymer solution, and a fiber formed by supplying the fibers. Irradiating with ions of the opposite polarity, and recovering the fibers while supplying a second air stream in a direction intersecting the direction of supplying the polymer solution and recovering the spun fibers; The manufacturing method of the fiber assembly characterized by including these is disclosed.

In addition, an electrostatic spinning method characterized by maintaining the spinning space at 1.5 to 100 atm is disclosed in Patent Document 3, and the formed fiber is irradiated with ions having a polarity opposite to that of the fiber. An electrostatic spinning method is disclosed in Patent Document 4.
JP 2005-290631 A JP 2005-264374 A JP 2004-256974 A Japanese Patent Application Laid-Open No. 2004-238749

  Here, in the spinning method (manufacturing method) of the microfiber using the electrostatic spraying method, as in the invention disclosed in the above-mentioned patent document, a grounded metal plate, a rotating cylinder, or the like is used as an integrated part. It is common to use. However, in these methods, since the spun organic fibers are accumulated in a felt shape, the fibers do not have directionality, and the drawing process that greatly contributes to the improvement of the physical properties of the fibers (stretching several tens of times in the fiber direction to obtain crystallinity) Cannot be improved). As a result, only materials with low strength can be obtained.

  An object of this invention is to provide the manufacturing method and manufacturing apparatus for manufacturing a spun yarn from the microfiber obtained by an electrostatic spraying method.

  The present inventor uses a fixed assembly and a rotating assembly provided with a ground, and an organic fiber is formed by electrostatically spraying a spinning solution in which an organic polymerizable substance is dissolved toward an intermediate position between the two assemblies. It was found that most of the particles are accumulated in the rotating assembly, but some are also accumulated in the stationary assembly, so that the stationary assembly and the rotating assembly are connected by the formed organic fiber. Further, by gradually separating the fixed stack from the rotating stack from the state, the organic fibers peeled off from the rotating stack are twisted in order from the portion close to the fixed stack, and as one spun yarn As a result, the present invention has been completed.

Specifically, the present invention
A preparation step of preparing a spinning solution in which an organic polymerizable substance is dissolved in a solvent;
While rotating the rotary stack in a space between the rotary stack with the ground and the fixed stack positioned in the extension line direction of the rotation center axis of the rotary stack, the direction from the direction perpendicular to the extension line An electrostatic spraying process for electrostatically spraying the spinning liquid;
After the organic fiber is formed as a spun yarn between the rotating stack and the fixed stack, the extending step of extending the spun yarn by increasing the distance between the rotating stack and the fixed stack,
The present invention relates to a method for producing an organic spun yarn having the following (claim 1).

The present invention also provides:
A rotating assembly;
A stationary assembly located in the direction of the extension of the rotation center axis of the rotational assembly;
An electrostatic spray nozzle located in a direction orthogonal to the extension line,
While rotating the rotating assembly, electrostatically spray a spinning solution in which an organic polymerizable substance is dissolved in an organic solvent toward the space between the rotating assembly and the stationary assembly,
The present invention relates to an organic spun yarn manufacturing apparatus, wherein an organic fiber is formed as spun yarn, and then the spun yarn is extended by increasing the distance between the rotating and fixed stacks.

  If the spinning solution is electrostatically sprayed toward the rotating assembly, unlike the case of the stationary assembly, the obtained organic fiber can have directionality. However, if the organic fiber is to be peeled off as a single yarn from the aggregate, the organic fiber will be cut, so that it is impossible to add a twist to make a spun yarn.

  On the other hand, in the manufacturing method and manufacturing apparatus of the present invention, the fixed stack is arranged on the rotation center axis of the rotary stack. Then, the spinning solution is electrostatically sprayed toward the space between the rotating stack and the stationary stack while rotating the rotating stack with the grounding. That is, it is characterized in that the spinning solution is electrostatically sprayed from an oblique direction with respect to a rotating assembly that is grounded and mainly accumulates organic fibers.

  The organic fibers formed from the spinning solution are also accumulated in the fixed aggregate (which may be smaller than the rotary aggregate), and the fixed aggregate and the rotary aggregate are connected by the organic fibers. The organic fibers are continuously accumulated on the rotating accumulation body, but are sequentially peeled off as a single thread so as to be pulled by the organic fibers accumulated on the stationary accumulation body, in order from the position close to the stationary accumulation body, Twist is applied at the same speed as the rotational speed of the rotating assembly, and the spun yarn is formed.

  Here, if the distance between the fixed stack and the rotary stack is increased (for example, the fixed stack is moved), the organic fibers peeled from the rotary stack are twisted according to the rotation of the rotary stack. Since the spun yarn is formed, the spun yarn can be made longer.

  It is preferable that the manufacturing method of the present invention further includes a winding step for winding the extended spun yarn after the extending step. Moreover, it is preferable that the manufacturing apparatus of the present invention further includes winding means for winding the extended spun yarn (Claim 6).

  Since the spun yarn obtained by the present invention is twisted, it has higher strength than ordinary organic fibers obtained by electrostatic spraying, and is not cut to the extent that it is pulled slightly. For this reason, it is also possible to continuously produce spun yarns composed of fine organic fibers by removing the tip portion of the spun yarn from the fixed stack or setting the fixed stack together with a winding device or the like. is there.

  The shape of the rotating accumulation body may be a disk shape, a cylindrical shape, or the like, but is preferably a funnel shape, and a belt-like ground is preferably provided on the inner peripheral portion (claims 3 and 7).

  This is because when the rotating accumulation body is disk-shaped or cylindrical, the organic fibers tend to accumulate on the outer peripheral portion of the bottom surface (circular shape) that is the accumulation portion, and the force for attracting the organic fibers tends to be weakened. On the other hand, in the case of a funnel, by providing a belt-like ground to the inner peripheral portion, the organic fibers are preferentially accumulated over the ground portion, and then easily peeled off.

  The organic polymerizable substance is preferably collagen or a lactic acid / glycolic acid copolymer.

  According to the manufacturing method and the manufacturing apparatus of the present invention, it is possible to easily and continuously manufacture spun yarn composed of fine organic fibers that has not been obtained conventionally.

  Embodiments of the present invention will be described below with reference to the drawings as appropriate. The present invention is not limited to these.

  A schematic flowchart of the method for producing an organic spun yarn of the present invention is shown in FIG.

  First, as step S1, an organic polymerizable substance is dissolved in a solvent to prepare a spinning solution (preparation process). The organic polymerizable substance and the solvent can be used in the present invention without any particular limitation as long as they can be fiberized by electrostatic spraying, but the solvent is an organic solvent or an organic solvent and A mixed solvent with water is preferred.

  Next, as step S2, the extension line is rotated while rotating the rotary stack in the space between the rotary stack with the ground and the fixed stack positioned in the extension line direction of the rotation center axis of the rotary stack. The spinning solution is electrostatically sprayed from a direction orthogonal to the direction (electrostatic spraying step). The shape of the rotating assembly is not particularly limited, but it is preferable that the surface facing the stationary assembly is circular in that the accumulated organic fibers are easily peeled off. In particular, it is preferably a hollow substantially conical or funnel shape having an opening, and a belt-like ground is provided on the inner periphery of the opening.

  The fixed assembly serves as a fulcrum for sequentially peeling the organic fibers accumulated on the rotating assembly, and is smaller than the rotating assembly. Moreover, there is no characteristic also in a structure, For example, a wire and a glass tube may be sufficient. This fixed assembly is preferably located on the rotation axis extension line of the rotary assembly in order to spin organic fibers stably.

  Here, the figure which shows the positional relationship of the fixed integration body in the electrostatic spraying process, a rotation integration body, and a nozzle is shown in FIG. The spinning solution 5 is electrostatically sprayed from the direction perpendicular to the straight line connecting the rotary stack 2 and the fixed stack 1 while the rotary stack 2 is rotated, with the nozzle 4 being directed to an intermediate position therebetween. Since the organic fibers 6 formed from the spinning solution 5 are accumulated in both the fixed accumulation body 1 and the rotation accumulation body 2, the fixed accumulation body 1 and the rotation accumulation body 2 are connected by the organic fibers 6.

  Thereafter, as shown in FIG. 3, the organic fibers 6 accumulated on the rotating accumulation body 2 with the solid accumulation body 1 as a fulcrum are peeled off along with the rotation movement of the rotating accumulation body 2 and twisted. The spun yarn 7 is formed while spinning.

  In this state, when the distance between the spun yarn 7 and the rotary assembly 2 becomes shorter and the spun yarn 7 is extended to a certain extent, the organic fiber 6 can no longer be regularly twisted, and the spun yarn Will be cut off. Then, next, as step S3, after the organic fiber 6 is formed as the spun yarn 7 between the rotary stack 2 and the fixed stack 1, the distance between the rotary stack 2 and the fixed stack 1 is increased. As a result, the spun yarn 7 is extended (extension process).

  Since the rotating assembly needs to be rotated during electrostatic spraying and is connected to a motor or the like, it is easier to increase the distance between the rotating assembly and the fixed assembly by moving the fixed assembly. It is. By increasing the distance, the length of the spun yarn can be extended.

Finally, as step S4, the spun yarn can be continuously manufactured by winding the extended spun yarn (winding step). The spun yarn extended to a certain extent can be wound by being set on a winding device or the like together with or after being removed from the fixed stack. Step S4 is an optional process, but the fixed integrated body itself may have a winding function, and step S3 and step S4 may be performed simultaneously.
[Example 1]
As Embodiment 1 of the present invention, a cylindrical rotating stack 2 (glass petri dish with a bottom diameter of 9 cm and a height of 2 cm) as shown in FIG. 4 is used as a rotating stack, and a wire (aluminum, outside is used as a fixed stack). Polycaprolactone spun yarn was produced using a diameter of 1.0 mm and a length of 30 cm. A 1 cm wide aluminum tape was applied to the side of the glass petri dish along the circumference and grounded. Further, the glass petri dish was arranged so that the height portion was directed in the opposite direction of the wire.
(Preparation process)
Polycaprolactone was dissolved in dichloromethane to make 20% by weight. This solution was used as a spinning solution.
(Electrostatic spraying process)
The wire 1, which is a fixed accumulation body, was fixed on the extension line of the rotation center of the rotation accumulation body 2 in such a direction that the length direction was straight to the rotation accumulation body 2. The distance between the wire 1 and the rotating assembly 2 was gradually increased from 0 cm. The nozzle of the electrostatic spraying device is at a position orthogonal to the straight line connecting the nearest part of the wire 1 and the nearest part of the aluminum tape of the rotating stack 2 and is set at an intermediate position between the wire 1 and the rotating stack 2 (wire). 10cm from the straight line connecting 1 and the rotating assembly 2). A stainless steel injection needle (24G) was used as the nozzle, and the spinning solution was electrostatically sprayed under the conditions of an extrusion pressure of 0.02 MPa and an applied voltage of 15 kV. The positional relationship during electrostatic spraying is as shown in FIG. 2, and the rotating assembly was rotated at a speed of 400 rpm.

The spinning solution sprayed from the nozzle is accumulated as a polycaprolactone fiber on a wire and a surface of the rotating stack opposite to the wire, and as shown in FIG. 3, the wire and the rotating stack are a plurality of polycaprolactone fibers. It was tied with. The polycaprolactone fibers accumulated in the rotating aggregate were pulled from the portion accumulated in the wire as a base point, and were peeled off from the rotating aggregate as a plurality of polycaprolactone fibers (fiber chains). At this time, the plurality of polycaprolactone fibers were formed as a single spun yarn in a state where twist was applied in the rotational direction of the rotating assembly.
(Extension process)
After that, the length of the spun yarn of polycaprolactone fiber can be extended by moving the wire away from the rotating assembly from the initial position (see FIG. 5 (a)) (see FIG. 5 (b)). It was. As a result of increasing the distance between the wire and the rotating assembly to 30 cm, the length of the spun yarn could be extended to 30 cm. The polycaprolactone fiber constituting the spun yarn was a homogeneous fiber having a fiber diameter of about 6 μm, and the spun yarn had a diameter of about 100 μm.
[Example 2]
As Example 2 of the present invention, a collagen spun yarn was manufactured using a funnel-shaped rotating assembly 8 as shown in FIG. The funnel-shaped rotating assembly 8 is made of polypropylene, the opening is circular with a diameter of 9 cm, and an aluminum tape 9 with a width of 1 cm is pasted from the edge of the opening so as to go around the inner peripheral surface. Was grounded.
(Preparation process)
Soluble collagen was dissolved in hydrochloric acid adjusted to pH 2 and then filtered to obtain an aqueous collagen solution (collagen concentration: 8.12% by weight). Next, 20 mL of hexafluoroisopropanol was added to 100 mL of this collagen aqueous solution to obtain a collagen solution. This collagen solution was used as a spinning solution.
(Electrostatic spraying process)
The positional relationship between the wire that is a fixed stack and the rotary stack 8 and the conditions for electrostatic spraying of the spinning solution were all the same as in Example 1.

The spinning solution sprayed from the nozzle was collected as collagen fibers on the wire and the aluminum tape 9 on the inner peripheral portion of the rotating stack 9, and the wire and the aluminum tape 9 were connected by a plurality of collagen fibers. The collagen fibers accumulated on the aluminum tape 9 were pulled from the portion accumulated on the wire as a base point, and peeled off from the aluminum tape 9 as a plurality of collagen fibers (fiber chains). At this time, the plurality of collagen fibers were formed as a single spun yarn in a state where twist was applied in the rotational direction of the rotary assembly 8.
(Extension process and winding process)
After the spun yarn started to be formed, the wire was moved to extend the spun yarn as in Example 1. When the spun yarn reached about 10 cm, the spun yarn was removed from the wire and wound around an acrylic tube with an outer diameter of 12 cm. The acrylic tube and spun yarn were fixed with tape. The position of the acrylic tube is adjusted to the vicinity of the apex of the collagen fiber cone formed by the rotation of the funnel-shaped rotating assembly 8 (the aluminum tape 9 is the bottom surface and the twisted portion is the apex). If the spun yarn was rotated so as to be wound, it was possible to continuously produce the spun yarn.

  In Example 2, since collagen fibers are accumulated on the aluminum tape attached to the inner peripheral portion of the funnel-shaped rotating accumulation body 8, the accumulated fibers are easily peeled off and are not deposited on the aluminum tape. . Moreover, the extension process and the winding process could be performed simultaneously, and the productivity of the spun yarn was high. In addition, the photograph which image | photographed the condition of the extension process and the winding process is shown in FIG.

Further, FIG. 8 shows a spun yarn made of collagen fibers wound around a glass tube. The collagen fibers constituting the spun yarn obtained in Example 2 were homogeneous fibers having a fiber diameter of about 6 μm, and the spun yarn had a diameter of about 100 μm.
[Example 3]
Lactic acid / glycolic acid copolymer (average molecular weight 220,000, lactic acid: glycolic acid = 75: 25 (molar ratio)) was dissolved in dichloromethane and used as a spinning solution, and the applied voltage was 15 kV. A spun yarn made of lactic acid / glycolic acid copolymer fiber could be obtained in the same manner as Example 2 except for the above.
[Example 4]
As Example 4 of the present invention, a polycaprolactone spun yarn was produced using the same spinning solution as in Example 1 and using a funnel-like rotating assembly 8 as in Example 2. The obtained polycaprolactone spun yarn had the same physical properties as in Example 1.

  As described above, according to the method and apparatus for producing an organic spun yarn of the present invention, it is possible to easily produce a spun yarn from fine organic fibers obtained by electrostatic spraying. Moreover, since twist can be added simultaneously with fiberization, a manufacturing process is simple and manufacturing time is also short. Furthermore, it can be applied to organic polymerized substances that can be fiberized by electrostatic spraying.

  The organic spun yarn production method and production apparatus of the present invention are useful in the spinning, woven fabric, medical field, etc. as a production method and production device for producing spun yarn using various organic polymerization substances as raw materials.

It is a schematic flowchart of the manufacturing method of the organic spun yarn of this invention. It is a conceptual diagram which shows the positional relationship of a fixed integration body, a rotation integration body, and a nozzle in an electrostatic spraying process. It is a figure explaining the principle in which an organic fiber is twisted and becomes a spun yarn in an electrostatic spraying process. FIG. 3 is an external view illustrating a columnar rotating assembly used in Example 1. It is the photograph which image | photographed the condition of the extension process of Example 1, (a) is the state before the movement of a wire, (b) is the state after the movement of a wire. FIG. 5 is an external view showing a funnel-shaped rotating assembly used in Example 2. It is the photograph which image | photographed the condition of the extension process and winding process of Example 2. FIG. 2 is a photograph of a spun yarn made of polycaprolactone fiber obtained in Example 2.

Explanation of symbols

1: Fixed stack 2: Rotating stack (columnar)
3: Rotating shaft 4: Nozzle for electrostatic spraying 5: Spinning liquid 6: Organic fiber 7: Spinning yarn 8: Rotating accumulation body (funnel shape)
9: Aluminum tape

Claims (7)

A preparation step of preparing a spinning solution in which an organic polymerizable substance is dissolved in a solvent;
While rotating the rotary stack in a space between the rotary stack with the ground and the fixed stack positioned in the extension line direction of the rotation center axis of the rotary stack, the direction from the direction perpendicular to the extension line An electrostatic spraying process for electrostatically spraying the spinning liquid;
After the organic fiber is formed as a spun yarn between the rotating stack and the fixed stack, the extending step of extending the spun yarn by increasing the distance between the rotating stack and the fixed stack,
The manufacturing method of the organic spun yarn which has this.   The method for producing an organic spun yarn according to claim 1, further comprising a winding step of winding the extended spun yarn after the extending step.   The manufacturing method of the organic spun yarn of Claim 1 or 2 with which the said rotation integration | stacking body is funnel-shaped and the strip | belt-shaped earth | ground is given to the inner peripheral part.   The method for producing an organic spun yarn according to any one of claims 1 to 3, wherein the organic polymerizable substance is collagen or a lactic acid / glycolic acid copolymer. A rotating assembly;
A stationary assembly located in the direction of the extension of the rotation center axis of the rotational assembly;
An electrostatic spray nozzle located in a direction orthogonal to the extension line,
While rotating the rotating assembly, electrostatically spray a spinning solution in which an organic polymerizable substance is dissolved in an organic solvent toward the space between the rotating assembly and the stationary assembly,
An apparatus for producing an organic spun yarn, wherein after the organic fiber is formed as a spun yarn, the spun yarn is extended by increasing the distance between the rotating stack and the fixed stack.   The organic spun yarn manufacturing apparatus according to claim 5, further comprising winding means for winding the extended spun yarn.   The apparatus for producing an organic spun yarn according to claim 5 or 6, wherein the rotary accumulation body has a funnel shape, and a belt-like ground is provided on an inner peripheral portion.