JPH0641647B2 - Method for melt spinning synthetic fibers - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION {Industrial field of application} The present invention relates to a fiber-forming polymer from a spinneret under pressurized gas,
Melt spinning of a thermoplastic polymer to obtain highly oriented yarns or yarns with excellent uniformity by spinning in an atmosphere such as depressurized gas, water vapor, or liquid, and then by taking them into an atmosphere of external atmospheric pressure. Regarding the improvement of the method.

{Prior Art} After melting the thermoplastic polymer and cooling and solidifying the yarn spun from the spinneret, euling and winding at a constant speed, the resulting melt spinning device produces a uniform yarn. There is a problem that the property is insufficient and the degree of orientation cannot be easily increased.

In order to solve these problems, many proposals have been made so far in which improvements are attempted by spinning a yarn in an atmosphere different from the atmospheric pressure and taking it up.

For example, Japanese Examined Patent Publication No. 49-36046 discloses a method in which a polymer is spun into a pressure chamber having multiple stages to obtain a fiber.

Further, Japanese Patent Publication No. 57-47283 discloses a method of obtaining a fiber by spinning a polymer in a spinning cylinder in which pressurized steam is maintained.

Further, Japanese Patent Publication No. 38-2016 discloses a method in which melt-spun yarn is passed through a liquid tank provided under a spinneret to obtain fibers.

In addition, Japanese Patent Publication No. 57-8206 discloses a method of introducing a polymer into a spinning cylinder whose pressure is reduced to 1 atm or less.

{Problems to be solved by the invention} As described above, various atmospheres have been proposed for the atmosphere in the spinning cylinder in which the polymer is spun depending on the target quality, the type of fiber, etc., but in any case However, in order to maintain an atmosphere different from the atmospheric pressure atmosphere, it is necessary to provide a fluid seal mechanism at the yarn outlet. If the fluid seal is insufficient, the atmosphere in the spinning tube can be set to a condition very close to atmospheric pressure, and the desired effect cannot be expected. In addition, the running cost for maintaining the state inside the spinning cylinder is also greatly increased. Further, at the yarn outlet, the yarn is easily disturbed by the flow of the fluid, resulting in a difference in yarn length between fibers, unevenness in quality, and deterioration in quality of the obtained fiber.

Therefore, in the method described in JP-B-49-36046, the method described in JP-B-57-47283, and the method described in JP-B-38-2016, the sealing means is It is shown to use a hole penetrating in the axial direction in the central portion of the rod-shaped body or a multi-stage labyrinth hole.

In addition, the inventors of the present invention have previously improved the fluid seal mechanism of this type by providing a tubular member having a thin groove on the circumferential surface substantially along the axis and detachable in the tubular member. A device for forming a yarn passage by a columnar plug inserted in the above was proposed.

However, in any case, when the spun yarn is threaded through the seal portion, the supply of pressurized gas, water vapor, liquid, etc. into the spinning cylinder is stopped, and the yarn is kept in a normal pressure state by communicating with the outside air. Through operation is required.

Generally, when a thermoplastic polymer is spun in an atmosphere of pressurized gas, depressurized gas, water vapor, liquid, or a combination thereof, the cooling effect is larger than that in the case of spinning in an atmosphere of normal pressure. However, these cooling effects cannot be expected at the threading stage as described above.

Therefore, the spun yarn, which has been run under normal atmospheric pressure and cooled, is passed through the yarn passage of the seal portion, but it is not sufficiently cooled and is not sufficiently solidified, or the strength is insufficient. Since the non-fibers contact the yarn passage, single yarn breakage occurs, resulting in a yarn jam or a yarn breakage, which makes the threading operation extremely difficult.

In order to solve such a problem, in the method described in Japanese Patent Publication No. 43-26331, the cooling liquid tank is lowered in advance to a position where the yarn is solidified in the normal atmosphere, the cooling liquid is filled, and then the spinneret is used. Although a method of returning it to a predetermined position near it is shown, not only a cooling liquid tank elevating device is required, but also the liquid surface vibrates while the cooling liquid tank rises, and the spinning yarns sway. However, it could not be said that the spun yarn contacted the inner wall of the liquid tank to cause yarn breakage, and the problem was solved sufficiently.

The object of the present invention is to eliminate the above-mentioned drawbacks of the prior art, and at the time of threading to the yarn outlet, without causing single yarn breakage,
An object of the present invention is to provide a method for melt spinning a synthetic fiber that can be easily threaded.

{Means for Solving the Problems} In order to achieve the above object, the present invention spun a thermoplastic polymer into a spinning cylinder provided directly below a spinneret and solidified by cooling to form a yarn. Then, in the melt spinning method of synthetic fiber, the yarn is drawn out of the spinning cylinder from a fluidly sealed yarn outlet provided at the lower end of the spinning cylinder. A tubular member having a yarn passage groove formed in the inner peripheral surface along the running direction of the yarn, and provided with a discharge pore, and the yarn outlet is attached to and detached from the tubular member. (B) When threading through the yarn outlet, the columnar plug is pulled out from the tubular member to open the yarn outlet, and (b) then, The yarn in the spinning tube is taken up by the take-out means through the opening, and (d) the Guiding the yarn being taken up by the take-out means to the yarn passage groove, and imparting the liquid discharged from the liquid discharge pores to the yarn before traveling in the yarn passage groove, E) After that, the columnar plug is inserted into the cylinder of the cylindrical member, and the opened yarn outlet is returned to the original state to allow threading.

Hereinafter, the present invention will be described in more detail with reference to the drawings.

FIG. 1 (A) is a longitudinal sectional view showing an embodiment of a melt spinning apparatus for carrying out the melt spinning method according to the present invention, and FIG. 1 (B) is a view taken along the line AA of FIG. Is.

In the figure, a spinning cylinder 2 that surrounds the periphery of the spinneret 1 immediately below the spinneret 1 and extends along a threading path of a spun yarn Y.
Inside the spinning tube 2, pressurized gas, water vapor, liquid or the like is supplied from the communication tube 3 through the supply hole 10, or is bleeded from the communication tube 3 and kept in a reduced pressure state.

At the lower end of the spinning tube 2, there is provided a hollow cylindrical member 4 having a yarn passage groove 13 having a sectional area slightly larger than that of the traveling yarn Y on the inner peripheral surface. The spinneret 13 is eccentrically mounted so as to be substantially on the center line of the spinneret 1, and is detachably locked to the spinning tube 2 by a flange 5 and a bolt 6. In addition, a cylindrical plug 7 is detachably fitted into the hollow cylindrical member 4.

The running yarn Y is drawn out of the spinning tube 2 through a yarn passage groove 13 provided in the hollow cylindrical member 4, and is taken up by a winder or the like (not shown) via a guide member 9. Guided by means. It should be noted that in FIG. 1, reference numeral 8 is a stop pin for fixing the cylindrical plug 7 to the hollow cylindrical member 4.

In the spinning cylinder immediately above the inlet side of the yarn passage groove 13 of the hollow cylindrical member 4, a liquid discharge pore connected to a communication pipe 12 for supplying a small amount of liquid into the yarn passage groove 13. 1
5, the liquid sent into the communication pipe 12 by a liquid supply means such as a pump (not shown) enters the spinning tube through the liquid discharge pores 15, and the gravity and the accompanying air current of the traveling yarn Y cause the yarn to flow. It is designed to flow into the inside of the strip passage groove 13.

FIG. 2 is an enlarged vertical cross-sectional view of a yarn outlet provided at the lower end of the spinning tube of the melt spinning apparatus shown in FIG.

The shape of the inner peripheral surface extending to the liquid discharge pores 15 on the inlet side of the yarn passage groove 13 provided in the hollow cylindrical member 4 is such that the liquid discharged from the liquid discharge pores 15 efficiently enters the yarn passage groove 13. It is preferable to have a mortar-like shape in which the diameter is gradually increased upward so as to flow in and adhere to the yarn. Further, the phase around the axis of the columnar plug 7 between the yarn passage groove 13 and the liquid discharge fine hole 15 is such that the liquid discharged from the liquid discharge fine hole 15 efficiently flows into the yarn passage groove 13 and becomes a yarn. To stick
It is preferable to provide the same phase. This is
When the cylindrical member 4 is locked to the lower end of the spinning tube 2 with the bolt 6 and the flange 5, the phase of the liquid discharge pore 15 and the phase of the yarn passage groove 13 are adjusted in advance in advance. This is possible if the bolt 6 is tightened.

FIG. 3 is an enlarged vertical cross-sectional view of another embodiment of the yarn outlet provided at the lower end of the spinning tube of the melt spinning apparatus shown in FIG.

In this example, the end portion of the yarn passage groove 13 located on the inlet side is formed in a mortar shape, and the mortar-shaped slope of the yarn passage groove is provided with a liquid discharge fine hole 15 for supplying a small amount of liquid. It is possible to supply a small amount of liquid directly into the yarn passage groove 13 by communicating with the liquid introduction hole 11 and the communication pipe 12 at the lower end of the spinning tube. Therefore, there are advantages that the liquid is supplied to the inside of the yarn passage groove 13 more effectively, the phase of the yarn passage groove 13 and the liquid introduction hole 11 may be roughly aligned, and the like.

It should be noted that both 16 and 16 'are sealing members for spinning out the liquid supplied from the liquid introduction hole 11.

FIG. 4 is an enlarged vertical cross-sectional view of another embodiment of the yarn outlet provided at the lower end of the spinning tube of the melt spinning apparatus of FIG.
FIG. 5 is a plan view of the liquid application guide shown in FIG.

In this example, the liquid application guide 17 is provided at a position close to and above the inlet side of the yarn passage groove 13.

As shown in FIG. 5, the yarn contacting portion of the liquid application guide 17 has a concave groove in the center when viewed from above, and the bottom of the groove is seen in FIG. 4 when viewed in the running direction of the yarn. As shown in FIG. 3, a liquid ejection fine hole 15 is opened in a convex portion which is a convex portion at the central portion from the yarn entry side to the yarn ejection side and which is the bottom of the groove. Liquid application guide 17
Is fixed to a hollow holder 18 made of metal, and the liquid sent through a hose (not shown) connected to the other end of the holder 18 is discharged from the liquid introduction hole 11 of the hollow holder 18 into a liquid discharge pore. 15 and flows out to the liquid application guide 17 and adheres to the yarn Y.

As shown in FIG. 4, the opening position of the liquid discharge fine hole 15 in the liquid application guide 17 is preferably provided at a position slightly shifted upstream from the apex of the convex portion of the liquid application guide. In addition, when processing the first yarn waste coming out of the spinneret, the liquid application guide 17 is provided in the traveling path of the yarn Y so that the yarn waste is not caught by the liquid application guide 17 and impairs operability. On the other hand, it is preferable to make it movable forward and backward.

In the embodiment shown in FIG. 4, the hollow holder 18 is fitted into a boss provided at the lower end of the spinning tube 2 and the packing 2
By pressing 0 with flange 21 and bolt 19,
By extending the packing 20 to the hollow holder side, the hollow holder is fixed and the hollow holder 17 is positioned in the axial direction. That is, when the bolt 19 is loosened, the overhanging of the packing 20 is reduced, and the holder 18 is made slidable, so that the operation of retracting or ejecting the liquid application guide 17 to a required position can be performed very easily.

The above is for a device for melt-spinning one yarn, but in the case of a multi-spin melt-spinning device for taking out yarns spun from the same spinner into a plurality of yarn groups, the spinning is performed. It goes without saying that it is possible to easily cope with this by providing the yarn passage groove and the liquid discharge pore corresponding to each of the yarn groups to be formed.

In the case of the plurality of yarn groups, it is possible to share the liquid discharge pores with each yarn group.

FIG. 6 is an enlarged vertical sectional view showing an embodiment of the yarn passage groove portion in the case of two yarns.

In FIG. 6, yarn passing grooves 13 and 13 ′ are provided for the yarns Y and Y ′ on the circumferential surface of the hollow cylindrical member 4, and the die of the hollow cylindrical member 4 is provided. A liquid reservoir groove 22 is provided at the end located on the surface side. The liquid supplied from the communication pipe 12 is supplied to the liquid reservoir groove 22 from the liquid discharge fine hole 15 and overflows to cause the yarn passage groove 1 to flow.
It flows into the inside of each of 3 and 13 'and adheres to the yarn. By doing this, even if the number of yarns increases,
There is an advantage that multiple yarns can be spun by replacing only a very limited number of parts without requiring a drastic change in the spinning device.

Next, a threading operation procedure in the melt spinning method of the present invention will be described with reference to the drawings of the above apparatus.

In FIG. 1, a three-way valve (not shown) at the inlet of the communication tube 3 closes the supply of pressurized air, steam, liquid or the like into the spinning tube 2 or the extraction of air from the spinning tube 2, The inside of the spinning tube 2 is brought into communication with the outside air and brought into a normal pressure state. After that, the stopper pin 8 is pulled out and the cylindrical plug 7 is attached to the hollow cylindrical member 4
It is further extracted to form an opening. In this state, the yarn spun from the spinneret is pulled out through the hollow cylindrical opening, and is pulled by a suction ejector or the like (not shown).

Next, a valve (not shown) at the inlet of the communication pipe 12 is opened to introduce a small amount of liquid into the liquid discharge pores 15, and the yarn passage groove 1
Supply inside 3. Subsequently, the yarn that has been picked up by the suction ejector is guided into the yarn passage groove 13 and the yarn is hooked on the guide 9. At this time, preferably the guide 9
By making it movable to the position indicated by the alternate long and short dash line, there is an advantage that the yarn is stably present inside the passage groove 13 and the guide 9 does not interfere with the subsequent operation.

Next, the cylindrical plug 7 is inserted into the hollow cylindrical member 4,
Locking with the pin 8 and operating the above-mentioned three-way valve (not shown), supply of pressurized gas, water vapor, or liquid to the inside of the spinning tube 2 or bleeding from the spinning tube 2 After forming the atmosphere, the valve (not shown) at the inlet of the communication pipe 12 is closed to complete the thread hooking.

The point of this operation is to contact the guide member such as the yarn passage groove 13 with the yarn that is being taken by a take-up device such as an ejector, and to attach a small amount of liquid to the yarn in advance, the communication pipe 12 The point is that the valve can be opened and the liquid can be supplied. At this time, the inside of the spinning tube is, of course,
Since the atmosphere is maintained under atmospheric pressure, pressurized gas, depressurized gas,
The heat treatment effect of the yarn, which is brought about by the special atmosphere consisting of water vapor, liquid or a combination thereof, cannot be expected, and the yarn contacting the guide member is easily solidified because the yarn is not sufficiently solidified or has insufficient strength. It is in a state where it is easy to break.

However, according to the present invention, since the yarn comes into contact with a small amount of liquid before it comes into contact with the yarn passage groove 13 serving as the guide member, even if the special atmosphere does not exist due to the cooling effect and the lubricating effect of the liquid. Even if it does not exist, single yarn breakage does not occur, and the operability of threading is significantly improved.

Further, as shown in FIG. 1, when guiding the yarns that are being taken by an ejector or the like into the yarn passage grooves 13 provided in the hollow cylindrical member, a small amount of liquid is applied to cause the capillary phenomenon of the liquid. Since the single yarns are attracted to each other and are easily bundled, the yarn hooking operation of the yarn is further improved.

The amount of the liquid supplied from the liquid discharge pores 15 to the yarn is appropriately selected depending on the spinning conditions such as the fineness of the yarn and the spinning speed.

When the amount of the liquid is extremely large, the amount of the liquid dropped becomes large, and a large amount of the liquid is brought into or scattered by the suction means such as the suction gun, which adversely affects the operability and the like. Usually, an amount of 5 cc / min to 100 cc / min is applied.

Further, when the discharge amount of the spinning machine can be arbitrarily changed, the discharge amount at the time of threading may be reduced so that the yarn can be cooled by applying a small amount of liquid.

However, when the discharge amount is reduced, the fineness of the yarn becomes thin, so that single yarn breakage is likely to occur, and the lubrication effect due to the adhesion of liquid becomes even more important. Nor.

The liquid applied to the yarn from the liquid discharge pores 15 may be water or an oil agent that is usually used in spinning.

The liquid supplied from the liquid discharge fine holes 15 may be in a mist state in which a part of the gas is mixed.
Any material may be used as long as it can apply the liquid to the yarn immediately before entering the inside.

Further, in the case where the liquid is supplied from the communication pipe 3 into the spinning tube 2 to form the special atmosphere, the amount of the liquid supplied from the communication pipe 3 can be adjusted to a small amount, and in this way, the supply can be performed. If the liquid supplied from the hole 10 into the spinning tube 2 travels along the inner wall of the spinning tube 2 and smoothly gathers at the end of the yarn passage groove 13 located on the spinner face side, a small amount of liquid is discharged. The supply hole 10 and the communication pipe 3 can also serve as the fine hole 15 and the communication pipe 12.

{Example} Nylon 6 polymer having a relative viscosity of 2.60 was melt-spun using the spinning device shown in FIG.

The spinning temperature is 265 ° C in polymer temperature, and the diameter of the die is 0.5 m.
Using a nozzle having mφ, 10 holes and an outer diameter of 69 mmφ, the discharge rate was 16 g / min. The distance from the spinneret surface to the yarn passage groove was 1900 mm, and the spun yarn was sucked with a suction gun and taken off. Width of thread passage groove is 0.3m
A cylindrical member having a slit of m, depth 0.5 mm, and length 40 mm on the inner peripheral surface was used. Table 1 shows an example in which water at 20 ° C. is used as the liquid supplied from the liquid discharge pores and no water is supplied at all as a comparative example.

As described above, according to the melt spinning method of the present invention, it is possible to perform the yarn hooking operation on the spinning device, which is impossible with the prior art, by applying a very small amount of liquid.

{Advantages of the Invention} The present invention, having the configuration as described above, has the following advantageous effects.

When hooking the thread on the thread-shaped outlet, a small amount of liquid is contacted immediately before it contacts the thread passage groove of the tubular member, so even if there is no special atmosphere due to the cooling effect and the lubrication effect of the liquid. In addition, there is no occurrence of single yarn breakage, and the operability of threading is significantly improved.

Since it is possible to respond to the spinning conditions such as the fineness of the spun yarn and the spinning speed by simply adjusting the flow rate of the liquid, the operation becomes extremely simple.

When guiding the yarn drawn by the take-up means into the yarn passage groove, by applying a small amount of liquid, the single yarns are attracted to each other by the capillary phenomenon of the liquid, and the yarns are easily bundled. Threading operation of the thread becomes even easier.

[Brief description of drawings]

FIG. 1 (A) is a longitudinal sectional view showing an embodiment of a melt spinning apparatus for carrying out the melt spinning method for synthetic fibers according to the present invention, and FIG. 1 (B) is FIG. 1 (A). FIG. FIG. 2 is an enlarged vertical cross-sectional view of a yarn outlet portion in the melt spinning apparatus of FIG. FIG. 3 is an enlarged vertical sectional view showing another embodiment of the yarn outlet section in FIG. FIG. 4 is an enlarged vertical sectional view showing still another embodiment of the yarn outlet portion in FIG. 1, and FIG. 5 is a plan view of the liquid application guide shown in FIG. FIG. 6 is an enlarged vertical sectional view showing still another embodiment of the outlet portion of the yarn outlet portion in FIG. DESCRIPTION OF SYMBOLS IN THE DRAWINGS 1; Spinneret, 2; Spinning cylinder 3; Communication tube, 4; Hollow cylindrical member 5; Flange, 6; Bolt 7; Cylindrical plug, 8; Stop pin 9; Guide member, 10; Supply Pipe 11; Fluid introduction hole, 12; Communication pipe 13, 13 '; Thread passage groove 15; Liquid discharge pore, 16, 16'; Packing 17; Liquid application guide, 18; Holder 19; Bolt, 20; Packing 21 ; Flange, Y, Y '; Thread

Claims (1)

[Claims] 1. A thermoplastic polymer is spun into a spinning cylinder provided immediately below a spinneret, cooled and solidified to form a yarn, and then the yarn is provided at the lower end of the spinning cylinder. A method for melt-spinning synthetic fibers, which is adapted to be drawn out of a spinning tube from a thread outlet section that is fluidically sealed, comprising: (a) providing a liquid discharge pore in the spinning tube and A cylindrical member having a yarn passage groove formed along the traveling direction of the yarn on the peripheral surface, and a columnar plug detachably fitted in the cylinder of the tubular member, (b) When threading the yarn into the yarn outlet, the columnar plug is pulled out from the tubular member to open the yarn outlet, and (c) Next, the yarn in the spinning tube is taken through the opening. And (d) guide the yarn being taken by the take-up means to the yarn passage groove. At the same time, liquid discharged from the liquid discharge pores is applied to the yarn before traveling in the yarn passage groove, and (e) after that, the columnar plug is inserted into the cylinder of the cylindrical member. A method for melt-spinning synthetic fibers, characterized in that the yarn outlet is opened and returned to the original state for threading.