JP2020158904A - Spinning equipment - Google Patents

Abstract

To provide a spinning equipment that is compact and capable of spinning with high productivity.SOLUTION: There is provided a melting-spinning equipment with a spinneret, the spinning equipment comprises a mechanism for sending a medium for cooling yarns from the inside of discharge hole arrangement on the spinneret discharge side to an outside of a discharge hole array on the spinneret discharge side, in which the spinning equipment having an annular spinneret in which a plurality of discharge holes are formed is configured to: have a number of spinneret of 2,000 pieces or more and 9,000 pieces or less; arrange the discharge holes on a circumference of concentric circles having different diameters centered on a predetermined point in the spinneret; and have a pore density of the discharge holes on the spinneret surface of 0.15 pieces/mm2 or more and 0.85 pieces/mm2 or less.SELECTED DRAWING: Figure 1

Description

The present invention relates to a spinning device having a specific spinneret and a cooling mechanism.

So far, the productivity improving technique by making the mouthpiece porous has been improved. For example, in Patent Document 1, in order to secure a flow path for sending cooling air, the discharge holes are partially missing in the circumferential direction of the spinneret, and the number of spinneret holes is 4,000 or more. Proposed.
Further, in Patent Document 2, although the number of holes in the base is 3,500 or more, the base used for the spinning equipment is large, resulting in a large spinning equipment.

Tokukousho 49-404 Japanese Patent No. 6288354

The present invention has been made based on the above background, and an object of the present invention is to provide a spinning apparatus that is compact and capable of spinning with high productivity.

As a result of intensive studies to solve the above problems, the present inventor adopts the following configuration to solve the above problems.

That is, according to the present invention
1. 1. A spinning device having an annular spinneret in which a plurality of discharge holes are formed, wherein the number of spinneret holes is 2,000 or more and 9,000 or less, and the discharge holes are inside the spinneret. The discharge holes are arranged in a concentric circle with different diameters centered on a predetermined point, and the hole density on the spinneret surface is 0.15 pieces / mm ² or more and 0.85 pieces / mm ² or less. A melt spinning apparatus having a spinneret arranged in such a manner, a mechanism for sending a medium for cooling a yarn from the inside of the discharge hole arrangement on the spinneret discharge side to the outside of the discharge hole array on the spinneret discharge side. Spinning equipment,
2. 2. The spinning apparatus according to 1, wherein the arrangement of the discharge holes in the annular spinneret is formed by either a radial arrangement or a staggered arrangement from the predetermined center.
3. 3. The arrangement of the discharge holes in the annular spinneret is such that, in any annular arrangement centered on the predetermined point, the intervals of adjacent discharge holes in the annular arrangement are all the same, by an evenly spaced arrangement. The spinning apparatus according to 1 above, which is formed.
4. The spinning apparatus according to 1, wherein the arrangement of discharge holes in the annular spinneret is formed in a radial arrangement from the predetermined center.
5. The spinning apparatus according to 1 to 4, wherein the number of concentric rows of the discharge holes is 9 or more and 22 or less.
6. The spinning apparatus according to 1 to 5, wherein the number of discharge holes in any two concentric rows of the base is the same.
7. The distance between the center of the discharge hole of the outermost concentric circle in the mouthpiece and the predetermined point in the mouthpiece is X1, and the distance between the center of the discharge hole of the innermost concentric circle in the mouthpiece and the predetermined point in the mouthpiece is X2. The spinning apparatus according to 1 to 6, wherein the discharge hole row arrangement coefficient X2 / X1 is 0.40 or more and 0.85 or less.
8. When the cross section of the introduction portion on the resin supply side is Y1 and the cross section on the resin discharge side of the spinneret is Y2, the discharge hole compression coefficient Y2 / Y1 is 0.010 or more and 0.080 or less. 7. The spinning apparatus according to 7.
9. The ratio Z2 / Z1 of the hole length of the discharge hole to the hole diameter is 1.0 or more and 5.0 or less when the hole length of the resin discharge hole is Z2 with respect to the diameter Z1 of the resin discharge hole. 8. The spinning apparatus according to 8.
10. The spinning apparatus according to 1 to 9 above, which has a mechanism for sucking a medium for cooling the yarn from the outside of the discharge hole on the discharge side of the spinneret.

According to the present invention, it is possible to provide a spinning device that is compact and capable of spinning with high productivity.

The plan view of the spinneret is shown. A part of the spinneret whose discharge holes are radially arranged is shown. A part of the spinneret whose discharge holes are staggered is shown. A part of the spinneret whose discharge holes are evenly spaced is shown. A part of the AA'plane of FIG. 2 is shown. The arrangement of the outermost row and the innermost row of the discharge holes in FIG. 1 is shown. A schematic diagram of the spinning apparatus of the present invention from the time when the thermoplastic resin is discharged from the discharge hole to the time when the thermoplastic resin is cooled and taken up is shown. FIG. 7 shows a schematic view in which a suction device for the thread cooling medium is arranged. A schematic diagram is shown in a conventionally known spinning apparatus from the time when the thermoplastic resin is discharged from the discharge hole to the time when the thermoplastic resin is cooled and taken back.

Hereinafter, the present invention will be described in detail.
The spinning apparatus according to the present invention has an annular spinneret in which a plurality of discharge holes are formed, and the number of the spinneret holes is 2,000 or more and 9,000 or less. The discharge holes are arranged in a concentric circle with different diameters centered on a predetermined point in the spinneret, and the discharge holes are formed in parallel radially from the predetermined center, and the discharge holes of the discharge holes. A melt spinning apparatus provided with a spinneret having a hole density of 0.15 to 0.85 pieces / mm ² on the spinneret surface, and a medium for cooling the yarn is applied from the inside of the lower portion of the spinneret to the spinneret. It was found that a spinning device having a mechanism for feeding to the outside of the lower part could solve the problem, and the present invention was reached.

First, the spinneret used in the spinning apparatus of the present invention will be described.
A plurality of discharge holes are formed in the spinneret used in the present invention. The number of discharge holes is 2,000 or more and 9,000 or less. If the number of discharge holes is 2,000 or more, the productivity is high and spinning becomes easy. The number of discharge holes is preferably 2,500 or more, more preferably 3,000 or more, and further preferably 3,500 or more.

On the other hand, when the number of discharge holes is 9,000 or less, the strength of the spinneret can be easily improved. The number of discharge holes is preferably 8,000 or less, more preferably 7,000 or less.

In the present invention, the spinneret can be miniaturized and the spinning apparatus can be made compact, but the spinning production capacity can be increased.
Therefore, the present invention has realized that the pore density of the spinneret can be increased.

In the prior art, the pore density is about 0.1 per mm ^{2 in} view of the hole arrangement area and the number of holes.

However, the pore density on the spinneret surface used in the present invention is 0.15 pieces / mm ² or more and 0.85 pieces / mm ² or less, which is higher than the conventionally known technique.

Further, the preferable range of the pore density is 0.20 pieces / mm ² or more and 0.80 pieces / mm ² or less, and more preferably 0.25 pieces / mm ² or more and 0.75 pieces / mm ² or less. More preferably, it is 0.30 pieces / mm ² or more and 0.70 pieces / mm ² or less.

Here, the pore density can be calculated from the area of the portion of the spinneret surface where the holes are arranged and the number of holes. Further, in order to increase the hole density, it can be achieved by increasing the number of holes without changing the size of the base. When the base size is not changed, it is preferable in that the existing equipment can be used as it is.

If the pore density is less than 0.15 pieces / mm ² , the size of the base becomes large when the perforated base is used, and the spinning equipment itself becomes large, so that the object of the present invention cannot be achieved. On the other hand, when the pore density on the surface of the spinneret exceeds 0.85 pieces / mm ² , a medium (cooling air) for cooling the yarn, which is another element of the present invention described later, is introduced from the center of the spinneret. Even if a mechanism (thread cooling device) that feeds in the outer peripheral direction is used, the cooling air cannot be uniformly removed, and abnormal threads such as thick threads, fine threads, and close contact are generated, and the quality of the raw yarn (undrawn yarn) is improved. It is not preferable because it lowers the yarn and worsens the spinning condition.

The diameter of the base for arranging the holes in the present invention is preferably 100 mm or more and 300 mm or less. More preferably, it is 250 mm or less, and further preferably 200 mm or less. If it is less than 100 mm, the number of discharge holes is reduced and the productivity is lowered when the pore density is set as described above, which is not preferable.

In the prior art, the diameter of the base is a large size exceeding 300 mm.

As described above, by increasing the pore density of the present invention, the spinneret can be made compact and the productivity can be improved.

The arrangement and spacing of the discharge holes are not particularly limited, but considering the distributability of the thermoplastic resin, it is preferable that the distances between the rows are the same, and further, they are arranged in a plurality of annular rings centered on the center inside the annular mouthpiece. It is preferable that it is.

The arrangement and spacing of the discharge holes are not particularly limited, but considering the distributability of the thermoplastic resin, it is preferable that the distances between the rows are the same, and further, they are arranged in a plurality of annular rings centered on the center inside the annular mouthpiece. It is preferable that it is.

As an example of a preferable hole arrangement, the discharge holes are arranged radially on a straight line in the radial direction from the center of the mouthpiece (FIG. 2), or the holes are arranged in a staggered pattern in an adjacent annular hole arrangement. The staggered sequence (FIG. 3) is also a preferred sequence.
Further, in any annular hole arrangement, an evenly spaced arrangement (FIG. 4) in which the intervals of adjacent discharge holes in the annular hole arrangement are all the same is also a preferable arrangement from the viewpoint of distributability of the thermoplastic resin. Among them, the radial arrangement is such that the discharge holes are formed in parallel in a radial pattern, so that a bundle of spun yarns spun from the spun cap is blown with cooling air from the inside under the spun to the outside. When cooling the strips, it is more preferable because it is easy for the cooling air to pass through.

The discharge holes form a group of annular arrays having different diameters from the center of the annular spinneret, and a group of hole aggregates arranged in the annular array having the same diameter are in the same row. The discharge holes are preferably arranged in 9 rows or more and 22 rows or less. By locating the discharge holes on the circumferences of nine rows or more of concentric circles having different diameters, it is possible to easily increase the number of discharge holes, and spinning can be performed with high productivity. The number of rows of concentric circles is more preferably 10 or more, and even more preferably 12 or more. On the other hand, by locating the discharge holes on the circumferences of 22 rows or less of concentric circles having different diameters, it is possible to easily maintain the withstand voltage deformation strength of the spinneret. The number of rows of concentric circles is more preferably 21 rows or less, still more preferably 20 rows or less. The number of discharge holes on the circumference of the annular spinneret is preferably the same in any two concentric rows. This makes it easier to evenly distribute the spinning liquid.

The number of discharge holes in each circumferential row is not particularly limited, but is preferably 200 or more and 500 or less, respectively. When the number of discharge holes in each circumferential row is 200 or more, the total number of discharge holes on the base surface can be increased, and spinning can be facilitated with high productivity.
More preferably 240 or more, still more preferably 300 or more. On the other hand, when the number of discharge holes 2 in each circumferential row is 500 or less, it is possible to easily improve the strength of the spinneret. It is more preferably 450 or less, still more preferably 400 or less. Further, it is preferable that the discharge holes in the same circumferential row are evenly spaced. This makes it easier to evenly distribute the molten resin to the discharge holes.

The distance between the center of the discharge hole of the outermost concentric circle in the spinning mouthpiece and the center point in the mouthpiece was X1, and the distance between the center of the discharge hole of the innermost concentric circle in the mouthpiece and the center point in the mouthpiece was X2. Occasionally (see FIG. 6), the discharge hole row arrangement coefficient X2 / X1 is preferably 0.40 or more and 0.85 or less. When the discharge hole row arrangement coefficient is less than 0.40, cooling spots on the innermost layer and the outermost layer of concentric circles may occur, which is not preferable. On the other hand, when the discharge hole row arrangement coefficient exceeds 0.85, the upper limit of the number of rows of concentric circles becomes small, it is difficult to achieve the target perforated cap, and it is difficult to increase the productivity, which is not preferable.

When the cross section of the introduction portion on the resin supply side and the cross section of the resin discharge side of the spinneret are Y1 (see FIG. 5), the discharge hole compression coefficient Y2 / Y1 is 0.010 or more and 0.080 or less. It is preferable to have.

If the discharge hole compression coefficient Y2 / Y1 is less than 0.010, the discharge hole pressure loss becomes high, and the equipment load becomes large, which makes it difficult to increase the productivity, which is not preferable. On the other hand, when the discharge hole compression coefficient Y2 / Y1 exceeds 0.080, a portion where the resin does not easily flow is generated on the resin supply side surface of the base, causing a quality difference such as thermal deterioration of the resin, resulting in uniform fibers. It is not preferable because it becomes difficult to obtain a bundle.

When the hole length of the resin discharge part is Z2 with respect to the diameter Z1 of the resin discharge part in the spinneret (see FIG. 5), the ratio Z2 / Z1 of the hole length of the discharge hole to the hole diameter is 1.0 or more and 5 It is preferably 0.0 or less. When the Z2 / Z1 is in this range, the heat of the molten resin is easily transferred to the base surface, so that the atmosphere temperature of the lower part of the base is low and the base surface is cooled, so that the molten resin is poorly discharged. This is because it becomes difficult to receive. If Z2 / Z1 is less than 1.0, discharge failure occurs due to expansion of the resin after passing through the discharge hole (so-called swell effect), which is not preferable. Further, when the Z2 / Z1 exceeds 5.0, the discharge hole pressure loss becomes high and the equipment load becomes large, which makes it difficult to increase the productivity, which is not preferable. The Z2 / Z1 is more preferably 1.0 or more and 4.0 or less, and further preferably 1.0 or more and 3.0 or less.
Examples of the material of the spinneret include stainless steel and cemented carbide. Examples of stainless steel include SUS316 and SUS630. Examples of cemented carbide include tungsten carbide-based cemented carbide. The tungsten carbide-based cemented carbide is an alloy obtained by sintering tungsten carbide using at least one metal selected from the group consisting of iron, cobalt, nickel, titanium, and chromium.

A thin-film film may be formed on the surface of the spinneret in order to improve the corrosion resistance and the releasability of the resin. As a material for the vapor deposition film, carbon-based compounds such as diamond-like carbon; boron-based compounds such as titanium nitride, boron nitride, and silicon nitride, and chromium-based compounds such as chromium nitride; titanium nitride, titanium nitride, and titanium aluminide. Titanium compounds and the like can be mentioned.

Next, the so-called yarn cooling air blower having a mechanism for sending the medium for cooling the yarn according to the present invention from the inside of the discharge hole on the spinneret discharge side to the outside of the discharge hole on the spinneret discharge side will be described in detail. explain.

Conventionally, a cooling device has been known in which a cooling device is directed from the outside of the discharge hole arrangement on the spinneret discharge side to the inside of the discharge hole arrangement when the cooling air is blown onto a thread made of molten resin discharged downward from the mouthpiece hole to cool the yarn. (An example is shown in FIG. 9.) In this case, the cooling air that has passed through the yarn cools the yarn due to the turbulence of air caused by the collision near the center of the base surface, which causes complicated yarn sway. In addition to the instability, the cooling air is difficult to penetrate at a high pore density such as 0.15 pieces / mm ² or more and 0.85 pieces / mm ² or less on the spinneret surface, and the yarn becomes closer to the center of the mouthpiece. The cooling difference becomes remarkable, and it is difficult to obtain a raw yarn (undrawn yarn) of uniform quality. Further, as can be seen from, for example, the radial arrangement shown in FIG. 2 and the staggered arrangement shown in FIG. 3, when the hole spacing is directed from the outside of the discharge hole arrangement on the spinneret discharge side to the inside of the discharge hole arrangement, the hole spacing increases as the hole arrangement moves toward the inner layer. The narrowing and the tendency for adhesion due to contact between adjacent threads greatly affects the thread quality.

On the other hand, when the cooling medium (for example, cooling air) is directed from the inside of the discharge hole arrangement on the spinneret discharge side to the outside of the discharge hole arrangement as in the present invention, the threads existing on the same circumference move to the outside of the hole arrangement. Since it spreads, it has the advantage of being less likely to cause close contact. That is, it is possible to improve the quality and productivity of the yarn by the spinning apparatus having both the spinneret and the spinneret cooling mechanism of the present invention.

In addition, in order to improve the uniformity of thread passage of the cooling air discharged from a predetermined point, by sucking from the outside of the lower part of the spinneret, it becomes possible to obtain more productive and uniform threads. It is also preferable because it is possible at the same time to prevent the base from being cooled and the thermoplastic resin from being discharged poorly. A specific installation example of the suction mechanism is shown in FIG.

In the present invention, any resin known to be melt-spun is not particularly limited, and examples thereof include polyester-based resins, polyolefin-based resins, aliphatic polyamide resins, and polyphenylene sulfides. Further, it may be applied not only to a single hole but also to a mouthpiece using two or more kinds of resins such as a core-sheath type, a side-by-side type, a segment pie type, and a sea island type composite fiber.

As a representative of the resin preferably used in the present invention, a polyester resin will be specifically exemplified.
Polyalkylene terephthalate such as polyethylene terephthalate, polytrimethylene terephthalate, or polybutylene terephthalate (polytetramethylene terephthalate), or poly such as polyethylene naphthalate, polytrimethylene naphthalate, or polybutylene naphthalate (polytetramethylene naphthalate). Examples can be made of aromatic dicarboxylic acids such as alkylene naphthalate and polyesters of aliphatic diols. Alternatively, it is a polyester obtained from an alicyclic dicarboxylic acid such as polyalkylenecyclohexanedicarboxylate and an aliphatic diol, or a polyester or polyethylene obtained from an aromatic dicarboxylic acid such as polycyclohexanedimethylene terephthalate and an alicyclic diol. Examples thereof include polyesters obtained from aliphatic dicarboxylic acids such as succinate, polybutylene succinate, or polyethylene adipate and aliphatic diols, or polyesters obtained from polyhydroxycarboxylic acids such as polylactic acid and polyhydroxybenzoic acid. it can. Alternatively, as the resin to be a polyester-based fiber, a copolymer or a blended product in an arbitrary ratio of these polyester components is also preferably exemplified.

Depending on the purpose, the dicarboxylic acid components constituting the polyester include isophthalic acid, phthalic acid, an alkali metal salt of 5-sulfoisophthalic acid, a quaternary ammonium salt of 5-sulfoisophthalic acid, and a quaternary of 5-sulfoisophthalic acid. Phosphonium salt, succinic acid, adipic acid, suberic acid, sebacic acid, cyclohexanedicarboxylic acid, α, β- (4-carboxyphenoxy) ethane, 4,4-dicarboxyphenyl, 2,6-naphthalenedicarboxylic acid, 2,7 -Naphthalenedicarboxylic acid, 1,3-cyclohexanedicarboxylic acid or 1,4-cyclohexanedicarboxylic acid or a diester compound consisting of an organic group having 1 to 10 carbon atoms thereof may be copolymerized with one component or two or more components. .. Similarly, as diol components constituting polyester, diethylene glycol, 1,2-propanediol, 1,2-butanediol, 1,3-butanediol, 1,6-hexanediol, neopentyl glycol, 1,4-cyclohexanedi One or two components of methanol, 2,2-bis (p-β-hydroxyethylphenyl) propane, polyethylene glycol, poly (1,2-propylene) glycol, poly (trimethylene) glycol, poly (tetramethylene) glycol, etc. The above may be copolymerized. Further, one component or two or more components of a hydroxycarboxylic acid such as ω-hydroxyalkylcarboxylic acid, pentaerythritol, trimethylolpropane, trimellitic acid, or trimesic acid, or a compound having three or more carboxylic acid components or hydroxyl groups. It is also preferable that the polyester is copolymerized to have a branch. It is also possible to use a mixture of polyesters having different compositions exemplified above.

Among them, the polyester-based resin preferably used in the present invention is preferably a polyalkylene terephthalate resin or a polyalkylene naphthalate resin from the viewpoint of its physical properties and good handleability.
The intrinsic viscosity of the fiber used in the present invention is preferably 0.35 to 0.80 dL / g, and particularly when the main component constituting the fiber is polyethylene terephthalate, the intrinsic viscosity is 0.40 to 0. It is more preferably 75 dL / g, and further preferably 0.45 to 0.70 dL / g. If the intrinsic viscosity is too low, the strength of the fiber tends to decrease and it tends to be difficult to form the fiber. On the other hand, if the intrinsic viscosity is too high, the performance of the obtained fiber tends to decrease due to a decrease in stretchability, which is not preferable.

The discharge rate per hole in the present invention is preferably 0.05 g / min or more and 1.00 g / min or less, more preferably 0.08 g / min or more and 0.90 g / min or less, and further preferably 0.10 g. It is preferably 0.80 g / min or more and 0.80 g / min or less. If it is less than 0.05 g / min, the pressure loss of the discharge hole becomes low and the discharge of the thermoplastic resin becomes uneven, which is not preferable. On the other hand, if it exceeds 1.00, the internal pressure on the upstream side of the discharge hole becomes too high, and it is difficult to stably discharge the thermoplastic resin, which is not preferable.

The spinning speed in the present invention is preferably a take-up speed of 300 to 2000 m / min, more preferably 400 to 1900 m / min, and further preferably 500 to 1800 m / min. If it is less than 300 m / min, it is difficult to obtain a yarn with low toughness and good drawability, and if it exceeds 1800 m / min, it is difficult to obtain a sufficient draw ratio and spinning yarn breakage increases, which is not preferable. ..

Further, it is preferable to install an oiling device in the middle of the process of picking up at the above-mentioned predetermined spinning speed. The surfactant used for oiling is preferably an anion-based or nonionic emulsion, and the application method may be any of a spray method, an oiling roller method, a quantitative oiling nozzle method and the like. ..

Examples and the like are given below in order to specify the structure and effect of the present invention, but the present invention is not limited to these examples. Unless otherwise specified, the part represents a mass part, and each physical property value in Examples and Comparative Examples was measured according to the following method.
(1) Intrinsic viscosity: [η]
In the case of polyester fiber, 0.12 g of a fiber (polymer) sample was dissolved in 10 mL of a tetrachloroethane / phenol mixed solvent (volume ratio 1/1), and the intrinsic viscosity (dL / g) at 35 ° C. was measured.
(2) Raw yarn quality The raw yarn quality was evaluated by the number of spinning yarn breaks and the coefficient of variation of fiber diameter. The number of spinning yarn breaks was calculated from the number of times that occurred during spinning for 8 hours. The coefficient of variation of fiber diameter was obtained by observing a cross section of the obtained fiber bundle cut perpendicular to the fiber axis direction with a microscope, measuring the fiber diameter of 100 filaments, and dividing the standard deviation by the average value. ..

[Example 1]
As a spinneret, a base with a radial arrangement of 4004 discharge holes (308 holes x 13 rows, discharge hole diameter 0.18 mm, discharge hole length-to-hole diameter ratio 1.1, discharge hole compression coefficient 0.051 A polyethylene terephthalate (PET) chip having an intrinsic viscosity of 0.64 dL / g was melted at 290 ° C. using a discharge hole row arrangement coefficient of 0.78 and a pore density of 0.55 / mm ² ), and 0. The mixture was discharged at 17 g / min, and cooling air was blown from the inside of the discharge hole arrangement on the discharge side of the spinneret toward the outside of the discharge hole arrangement to obtain a fiber bundle at a winding speed of 1150 m / min.

[Example 2]
Radial arrangement of mouthpieces with 4004 discharge holes (286 holes x 14 rows, discharge hole diameter 0.18 mm, discharge hole length-to-hole diameter ratio 1.1, discharge hole compression coefficient 0.051, Using a discharge hole row arrangement coefficient of 0.78 and a hole density of 0.55 pieces / mm ² )), a polyethylene terephthalate (PET) chip having an intrinsic viscosity of 0.64 dL / g was melted at 290 ° C. and 0. The mixture was discharged at 17 g / min and blown with cooling air in the same manner as in Example 1 to obtain a fiber bundle at a winding speed of 1150 m / min.

[Example 3]
Radial arrangement of mouthpieces with 4005 discharge holes (267 holes x 15 rows, discharge hole diameter 0.18 mm, discharge hole length-to-hole diameter ratio 1.1, discharge hole compression coefficient 0.051, Using a discharge hole row arrangement coefficient of 0.78 and a hole density of 0.55 pieces / mm ² )), a polyethylene terephthalate (PET) chip having an intrinsic viscosity of 0.64 dL / g was melted at 290 ° C. and 0. The mixture was discharged at 17 g / min and blown with cooling air in the same manner as in Example 1 to obtain a fiber bundle at a winding speed of 1150 m / min.

[Example 4]
Radially arranged bases with 4,000 discharge holes (250 holes x 16 rows, discharge hole diameter 0.18 mm, discharge hole length to hole diameter ratio 1.1, discharge hole compression coefficient 0. Using 066, discharge hole row arrangement coefficient 0.78, pore density 0.55 pieces / mm ² )), a polyethylene terephthalate (PET) chip having an intrinsic viscosity of 0.64 dL / g was melted at 290 ° C. The mixture was discharged at 0.17 g / min and blown with cooling air in the same manner as in Example 1 to obtain a fiber bundle at a winding speed of 1150 m / min.

[Example 5]
As a spinneret, a base with a radial arrangement of 4,004 discharge holes (286 holes x 14 rows, discharge hole diameter 0.18 mm, ratio of discharge hole length to hole diameter is 1.3, discharge hole compression coefficient 0. Using 035, discharge hole row arrangement coefficient 0.78, hole density 0.55 pieces / mm ² )), a polyethylene terephthalate (PET) chip having an intrinsic viscosity of 0.64 dL / g was melted at 290 ° C. The mixture was discharged at 0.17 g / min and blown with cooling air in the same manner as in Example 1 to obtain a fiber bundle at a winding speed of 1150 m / min.

[Example 6]
Radial arrangement of mouthpieces with 4,004 discharge holes (286 holes x 14 rows, discharge hole diameter 0.18 mm, discharge hole length-to-hole diameter ratio 1.1, discharge hole compression coefficient 0. Using 051, discharge hole row arrangement coefficient 0.76, hole density 0.51 pieces / mm ² )), a polyethylene terephthalate (PET) chip with an intrinsic viscosity of 0.64 dL / g was melted at 290 ° C and per hole. The mixture was discharged at 0.17 g / min and blown with cooling air in the same manner as in Example 1 to obtain a fiber bundle at a winding speed of 1150 m / min.

[Example 7]
Radially arranged bases with 4,000 discharge holes (250 holes x 16 rows, discharge hole diameter 0.18 mm, discharge hole length-to-hole diameter ratio of 2.2, discharge hole compression coefficient 0. Using 051, discharge hole row arrangement coefficient 0.78, hole density 0.55 pieces / mm ² )), a polyethylene terephthalate (PET) chip with an intrinsic viscosity of 0.64 dL / g was melted at 290 ° C and per hole. The mixture was discharged at 0.17 g / min and blown with cooling air in the same manner as in Example 1 to obtain a fiber bundle at a winding speed of 1150 m / min.

[Example 8]
Radially arranged bases with 6,000 discharge holes (400 holes x 15 rows, discharge hole diameter 0.18 mm, discharge hole length to hole diameter ratio 1.1, discharge hole compression coefficient 0. Using 066, discharge hole row arrangement coefficient 0.66, hole density 0.13 pieces / mm ² )), a polyethylene terephthalate (PET) chip having an intrinsic viscosity of 0.64 dL / g was melted at 290 ° C. The mixture was discharged at 0.17 g / min and blown with cooling air in the same manner as in Example 1 to obtain a fiber bundle at a winding speed of 1150 m / min.

[Example 9]
Radially arranged bases with 8,000 discharge holes (400 holes x 20 rows, discharge hole diameter 0.18 mm, discharge hole length-to-hole diameter ratio 1.1, discharge hole compression coefficient 0. Using 051, discharge hole row arrangement coefficient 0.66, hole density 0.17 pieces / mm ² )), a polyethylene terephthalate (PET) chip with an intrinsic viscosity of 0.64 dL / g was melted at 290 ° C and per hole. The mixture was discharged at 0.17 g / min and blown with cooling air in the same manner as in Example 1 to obtain a fiber bundle at a winding speed of 1150 m / min.

[Example 10]
Radially arranged bases with 8,000 discharge holes (400 holes x 20 rows, discharge hole diameter 0.18 mm, discharge hole length-to-hole diameter ratio 1.1, discharge hole compression coefficient 0. Using 051, discharge hole row arrangement coefficient 0.66, hole density 0.17 pieces / mm ² )), a polyethylene terephthalate (PET) chip having an intrinsic viscosity of 0.64 dL / g was melted at 290 ° C. Discharge at 0.17 g / min, blow cooling air from the inside of the discharge hole arrangement on the discharge side of the spinneret toward the outside of the discharge hole arrangement, and pass from the outside of the discharge hole arrangement in the same manner as in Example 1. After sucking, a fiber bundle was obtained at a winding speed of 1150 m / min.
The evaluation results of Examples 1 to 10 are shown in Table 1.

[Example 11]
Radially arranged bases with 4,000 discharge holes (400 holes x 10 rows, discharge hole diameter 0.18 mm, discharge hole length-to-hole diameter ratio 1.1, discharge hole compression coefficient 0. Using 090, discharge hole row arrangement coefficient 0.78, hole density 0.55 pieces / mm ² )), a polyethylene terephthalate (PET) chip having an intrinsic viscosity of 0.64 dL / g was melted at 290 ° C. The mixture was discharged at 0.17 g / min and blown with cooling air in the same manner as in Example 1 to obtain a fiber bundle at a winding speed of 1150 m / min.

[Example 12]
Equally spaced spouts with 6,000 discharge holes (8 rows, discharge hole diameter 0.18 mm, discharge hole length to hole diameter ratio 1.1, discharge hole compression coefficient 0.066, spun cap) Using a discharge hole row arrangement coefficient of 0.78 and a hole density of 0.85 / mm ² )), a polyethylene terephthalate (PET) chip having an intrinsic viscosity of 0.64 dL / g was melted at 290 ° C. and 0. The mixture was discharged at 17 g / min and blown with cooling air in the same manner as in Example 1 to obtain a fiber bundle at a winding speed of 1150 m / min.

[Example 13]
As a spinneret, a staggered base with 4,000 discharge holes (250 holes x 16 rows, discharge hole diameter 0.18 mm, discharge hole length to hole diameter ratio 1.1, discharge hole compression coefficient 0. Using 066, discharge hole row arrangement coefficient 0.78, pore density 0.55 pieces / mm ² )), a polyethylene terephthalate (PET) chip having an intrinsic viscosity of 0.64 dL / g was melted at 290 ° C. The mixture was discharged at 0.17 g / min and blown with cooling air in the same manner as in Example 1 to obtain a fiber bundle at a winding speed of 1150 m / min.

[Example 14]
Radially arranged bases with 4,000 discharge holes (400 holes x 10 rows, discharge hole diameter 0.18 mm, discharge hole length-to-hole diameter ratio 1.1, discharge hole compression coefficient 0. Using 090, discharge hole row arrangement coefficient 0.78, hole density 0.55 pieces / mm ² )), a polyethylene terephthalate (PET) chip having an intrinsic viscosity of 0.64 dL / g was melted at 290 ° C. The mixture was discharged at 0.17 g / min and blown with cooling air in the same manner as in Example 1 to obtain a fiber bundle at a winding speed of 1150 m / min.

[Example 15]
Radially arranged bases with 4,000 discharge holes (160 holes x 25 rows, discharge hole diameter 0.18 mm, discharge hole length-to-hole diameter ratio 1.1, discharge hole compression coefficient 0. Using 066, discharge hole row arrangement coefficient 0.78, pore density 0.55 pieces / mm ² )), a polyethylene terephthalate (PET) chip having an intrinsic viscosity of 0.64 dL / g was melted at 290 ° C. The mixture was discharged at 0.17 g / min and blown with cooling air in the same manner as in Example 1 to obtain a fiber bundle at a winding speed of 1150 m / min.

[Example 16]
Radially arranged bases with 4,000 discharge holes (250 holes x 16 rows, discharge hole diameter 0.18 mm, discharge hole length to hole diameter ratio 1.1, discharge hole compression coefficient 0. Using 066, discharge hole row arrangement coefficient 0.37, hole density 0.06 pieces / mm ² )), a polyethylene terephthalate (PET) chip having an intrinsic viscosity of 0.64 dL / g was melted at 290 ° C. The mixture was discharged at 0.17 g / min and blown with cooling air in the same manner as in Example 1 to obtain a fiber bundle at a winding speed of 1150 m / min.

[Example 17]
Radially arranged bases with 4,000 discharge holes (400 holes x 10 rows, discharge hole diameter 0.18 mm, discharge hole length-to-hole diameter ratio 1.1, discharge hole compression coefficient 0. Using 090, discharge hole row arrangement coefficient 0.81, hole density 0.64 pieces / mm ² )), a polyethylene terephthalate (PET) chip having an intrinsic viscosity of 0.64 dL / g was melted at 290 ° C. The mixture was discharged at 0.17 g / min and blown with cooling air in the same manner as in Example 1 to obtain a fiber bundle at a winding speed of 1150 m / min.

[Example 18]
Radially arranged bases with 4,000 discharge holes (250 holes x 16 rows, discharge hole diameter 0.18 mm, discharge hole length to hole diameter ratio 1.1, discharge hole compression coefficient 0. Using 023, discharge hole row arrangement coefficient 0.78, pore density 0.55 pieces / mm ² )), a polyethylene terephthalate (PET) chip having an intrinsic viscosity of 0.64 dL / g was melted at 290 ° C. The mixture was discharged at 0.17 g / min and blown with cooling air in the same manner as in Example 1 to obtain a fiber bundle at a winding speed of 1150 m / min.

[Example 19]
Radially arranged bases with 4,000 discharge holes (250 holes x 16 rows, discharge hole diameter 0.18 mm, discharge hole length to hole diameter ratio 1.1, discharge hole compression coefficient 0. Using 130, discharge hole row arrangement coefficient 0.78, hole density 0.55 pieces / mm ² )), a polyethylene terephthalate (PET) chip having an intrinsic viscosity of 0.64 dL / g was melted at 290 ° C. The mixture was discharged at 0.17 g / min and blown with cooling air in the same manner as in Example 1 to obtain a fiber bundle at a winding speed of 1150 m / min.

[Example 20]
Radially arranged bases with 4,000 discharge holes (400 holes x 10 rows, discharge hole diameter 0.18 mm, discharge hole length-to-hole diameter ratio 1.1, discharge hole compression coefficient 0. Using 066, discharge hole row arrangement coefficient 0.85, hole density 0.76 pieces / mm ² )), a polyethylene terephthalate (PET) chip having an intrinsic viscosity of 0.64 dL / g was melted at 290 ° C. The mixture was discharged at 0.17 g / min and blown with cooling air in the same manner as in Example 1 to obtain a fiber bundle at a winding speed of 1150 m / min.
The evaluation results of Examples 11 to 20 are shown in Table 2.

[Comparative Example 1]
As a spinning mouthpiece, a base with a radial arrangement of 4,000 discharge holes (250 holes x 16 rows, discharge hole diameter 0.18 mm, ratio of discharge hole length to hole diameter is 1.1, discharge hole compression coefficient 0. Using 066, discharge hole row arrangement coefficient 0.78, pore density 0.55 pieces / mm ² )), a polyethylene terephthalate (PET) chip having an intrinsic viscosity of 0.64 dL / g was melted at 290 ° C. Discharge at 0.17 g / min, blow cooling air from the outside of the discharge hole arrangement on the discharge side of the spinneret toward the inside of the discharge hole arrangement, and blow cooling air from the outside of the lower part of the mouthpiece toward the inside, and the winding speed is 1150 m. A fiber bundle was obtained at / min.

[Comparative Example 2]
Radially arranged bases with 6,000 discharge holes (400 holes x 15 rows, discharge hole diameter 0.18 mm, discharge hole length to hole diameter ratio 1.1, discharge hole compression coefficient 0. Using 066, discharge hole row arrangement coefficient 0.78, hole density 0.82 pieces / mm ² )), a polyethylene terephthalate (PET) chip having an intrinsic viscosity of 0.64 dL / g was melted at 290 ° C. The mixture was discharged at 0.17 g / min and blown with cooling air in the same manner as in Comparative Example 1 to obtain a fiber bundle at a winding speed of 1150 m / min.
The evaluation results of Comparative Examples 1 and 2 are shown in Table 3.

1. 1. Spinning cap 2. Discharge hole 3. Predetermined point E in the spinneret
4. Auxiliary line arranged from E of 3 to the circumference of the spinneret 5. Circular auxiliary line centered on E of 3 6. Introduction part of thermoplastic resin in 1. 7. Discharge hole of the thermoplastic resin discharge part in 1. Distance between the outermost concentric circular discharge hole center of the discharge hole arrangement and a predetermined point in the mouthpiece: X1
9. Distance between the innermost concentric circular discharge hole center of the discharge hole arrangement and a predetermined point in the mouthpiece: X2
10. Introduced part hole cross section of thermoplastic resin: Y1
11. Discharge hole cross section: Y2
12. Discharge part hole diameter: Z1
13. Hole length of discharge hole: Z2
14. Spinning pack body 15. Insulation 16. Cooling medium blowing device 17. Oiling device 18. Pick-up roller 19. Cooling medium suction device dn. Discharge holes (n = 1, 2, ..., P) arranged concentrically in row p, and the distance between adjacent discharge holes in row p.

Claims (10)

A spinning device having an annular spinneret in which a plurality of discharge holes are formed, wherein the number of spinneret holes is 2,000 or more and 9,000 or less, and the discharge holes are inside the spinneret. The discharge holes are arranged in a concentric circle with different diameters centered on a predetermined point, and the hole density on the spinneret surface is 0.15 pieces / mm ² or more and 0.85 pieces / mm ² or less. A melt spinning apparatus having a spinneret arranged in such a manner, a mechanism for sending a medium for cooling a yarn from the inside of the discharge hole arrangement on the spinneret discharge side to the outside of the discharge hole array on the spinneret discharge side. Spinning equipment to have. The spinning apparatus according to claim 1, wherein the arrangement of discharge holes in the annular spinneret is formed by either a radial arrangement or a staggered arrangement from the predetermined center. The arrangement of the discharge holes in the annular spinneret is such that, in any annular arrangement centered on the predetermined point, the intervals of adjacent discharge holes in the annular arrangement are all the same, by an evenly spaced arrangement. The spinning apparatus according to claim 1, which is formed. The spinning apparatus according to claim 1, wherein the arrangement of discharge holes in the annular spinneret is formed in a radial arrangement from the predetermined center. The spinning apparatus according to claim 1, wherein the number of concentric circles of the discharge holes is 9 or more and 22 or less. The spinning apparatus according to claim 1, wherein the number of discharge holes in any two concentric rows of the base is the same. The distance between the center of the discharge hole of the outermost concentric circle in the mouthpiece and the predetermined point in the mouthpiece is X1, and the distance between the center of the discharge hole of the innermost concentric circle in the mouthpiece and the predetermined point in the mouthpiece is X2. The spinning apparatus according to claim 1 to 6, wherein the discharge hole row arrangement coefficient X2 / X1 is 0.40 or more and 0.85 or less. The claim that the discharge hole compression coefficient Y2 / Y1 is 0.010 or more and 0.080 or less when the cross-sectional area of the introduction portion on the resin supply side is Y1 and the cross-sectional area on the resin discharge side of the spinneret is Y2. The spinning apparatus according to 1 to 7. Claim 1 in which the ratio Z2 / Z1 of the hole length of the discharge hole to the hole diameter is 1.0 or more and 5.0 or less when the hole length of the resin discharge hole is Z2 with respect to the diameter Z1 of the resin discharge hole. 8. The spinning apparatus according to 8. The spinning apparatus according to claim 1, further comprising a mechanism for sucking a medium for cooling the yarn from the outside of the discharge hole on the discharge side of the spinneret.

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