JP3533872B2 - Direct spin drawing method for synthetic fibers - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for direct spinning and drawing synthetic fibers. More specifically, the present invention relates to a method for direct spinning and drawing synthetic fibers, which is capable of efficiently producing synthetic fibers having high strength and relatively fineness, which are suitable for textiles for industrial materials, particularly for industrial materials.

[0002]

2. Description of the Related Art Japanese Patent Application Laid-Open No. 63-165513 discloses
Disclosed is a direct spinning and drawing method for synthetic fibers, in which a Nelson roller is used to increase the production efficiency, and a plurality of yarns are wound around two or more sets of Nelson rollers a plurality of times for drawing and heat treatment. ing.

This method is an excellent method for drawing and heat-treating a yarn having a large fineness, because it has good heat transfer during drawing and heat treatment, but it is a multi-filament yarn, for example, 8 or more yarns. However, there is a problem in that the roller length becomes long when the yarns of (1) and (2) are simultaneously drawn. That is, when trying to draw multiple yarns at the same time, the roller length becomes long as the yarn width, the yarn pitch, the number of yarn windings and the number of yarns increase. When the roller is thus lengthened, there is a problem that it becomes difficult to secure stability at high speed rotation of the roller due to the increase in weight, especially in the case of a heating roller, and the cost becomes high.

Further, for the purpose of simultaneously stretching the multiple yarns, in the same manner as described above, when it is attempted to appropriately secure the yarn width, the yarn pitch, the number of windings of the yarns, etc., the twist between the Nelson rollers is increased. It is necessary to take a large angle. However, as the twist angle between the rollers increases, the yarn is stretched while being twisted with the stretching roller in the next step, and smooth stretching is less likely to occur, resulting in yarn breakage or single yarn. It is likely to cause breakage, which causes a decrease in yield and a decrease in quality.

Further, Japanese Patent Publication No. 42-8727 discloses that
Using a fixed pin that has a matte surface and steam or heat medium flowing inside to heat it, a separation roller that has a matte surface, and a stretching roller that has a matte surface on the end side and the other that is a mirror surface. A method is disclosed in which a yarn is threaded from a stretched roller matte surface to a separation roller 1-2 times and then wound.

According to this method, the frictional resistance between the yarn and the roller becomes small in the section which is the matte surface of the drawing roller, and moreover, heat is applied to release the strain due to the drawing, and the obtained yarn remains. Shrinkage rate becomes small.

However, in this method as well, the Nelson roller is used and the drawing and heat treatment are carried out continuously. Therefore, as in the case of the above-mentioned Japanese Patent Laid-Open No. 63-165513, the lengthening of the roller, the yarn breakage, the single yarn breakage, etc. I have a problem.

In view of this, Japanese Patent Application Laid-Open No. 4-245909 discloses a method for drawing and heat-treating multiple yarns of eight or more yarns by a multi-stage drawing and heat treatment using a plurality of roller groups. The first-stage stretching roller is composed of a mirror-finished roller having a surface roughness of 1S or less and a satin-finished roller having a surface roughness of 4 to 8S.
Then, a method of performing drawing and heat treatment in the second and subsequent steps is disclosed.

[0009]

However, this method has a problem that since the degree of improvement in the actual yarn breakage frequency is small, the drawing yield is reduced by the increase in the number of yarns. In addition, this method allows a relatively fineness, for example, 21
When 0d, 315d, and 420d high-strength yarns are obtained and used for fabrics such as airbag fabrics, tarpaulins and bags, fluff that strongly affects the fabric quality required for those applications, for example, It was difficult to steadily reduce it to a low level of several or less per 10 million meters.

Therefore, the main object of the present invention is to solve the above-mentioned problems in the prior art and to enable multi-thread drawing of eight or more yarns without using a long drawing roller.
Another object of the present invention is to provide a direct spinning / drawing method capable of producing a synthetic fiber excellent in yield and quality with less yarn breakage and single yarn breakage.

[0011]

In order to achieve the above object, the method for direct spinning and drawing synthetic fibers according to the present invention is a method in which melt-spun filaments are cooled and solidified and oiled at a speed of 500 m / min or more. In the direct spinning and drawing method of synthetic fibers in which the fiber is taken up, subsequently drawn in multiple stages using a plurality of roller groups, heat treated, and wound at a speed of 3000 m / min or more, the yarn feeding roller group before the first drawing is Roughness (Rmax) is a plurality of rollers having a mirror surface of 1 μm or less, and the first stage stretching roller group is at least two rollers having a surface roughness (RMS) of 0.3 to 3.0 μm. The yarn is sequentially wound on each of the rollers of the yarn supplying roller group and the stretching roller group, and then drawn from the second stage onward and heat-treated.

Further, the method of the present invention is suitable for simultaneously drawing and heat-treating eight or more multi-filaments, and the temperature of the first-stage drawing roller is preferably 100 to 180 ° C.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION An example of the method for direct spinning and drawing synthetic fibers of the present invention will be described below with reference to the drawings.

FIG. 1 is a process schematic view showing a portion after a take-up roller in an example of a direct spinning drawing process to which the method of the present invention is applied. In this figure, eight yarns are directly spun and drawn at the same time. .

In carrying out the method of the present invention, first, a plurality of yarns K made of a plurality of synthetic fibers spun from a spinneret attached to a plurality of spinning sections provided in a melt spinning machine are After being passed through the cooling section, it is cooled and solidified, and then each yarn is lubricated at the lubrication section, and the filaments are sequentially hooked on the take-up rollers A and B and taken out at a predetermined speed of 500 m / min or more.

The yarn K taken up is subjected to drawing by a plurality of yarn feeding rollers C and C'shown, drawn in order in a first drawing area a and a second drawing area b, and then heat treated. After that, the cheese-shaped package I is wound up by the winder J at a high speed of 3000 m / min or more by the turn guide rollers H and H '.

In the present invention, the yarn feeding roller groups C, C ',
Each of the stretching roller group D, E, F, F'and the heat treatment roller group G, G'consists of two or more rollers. Among the rollers forming these groups, the yarn feeding roller groups C and C'and the first stage drawing roller groups D and E are of the one-sided type. The remaining stretching roller groups F and F ′ and the heat treatment roller groups G and G ′ may be Nelson type.

The rotation speed of the former one-sided roller group may be the same, or may be different if the speed difference between the rollers is 50% or less. on the other hand,
The rotation speed of the Nelson type roller group is synchronized and the same.

Then, the yarn K, which is wound on the take-up roller groups A and B in sequence and taken up, continues to have a surface roughness (Rma).
x) The yarn feeding roller groups C and C'consisting of a plurality of rollers each having a mirror surface of 1 .mu.m or less are successively hooked. The contact angle between the yarn K and the rollers A, B, C, C'in this one-sided hanging type is generally about 120 to 240 degrees, but the diameter of the roller, the speed of the yarn, the fineness of the yarn, etc. In consideration of this, the optimum contact length necessary for gripping the yarn may be selected.

Since the yarn supplying roller groups C and C'are mirror-like rollers having a surface roughness (Rmax) of 1 μm or less, the yarn K can be sufficiently gripped even by the one-sided roller system. As a result, The simultaneous hanging process of multiple yarns of eight or more yarns is possible by the one-sided roller method. On the other hand, if satin-finished rollers are used as the yarn feeding roller groups C and C ', a large number of rollers or long-diameter rollers are required to secure a sufficient gripping force. It becomes difficult to make the yarn simultaneous drawing process.

Next, the yarn K is hooked in sequence onto a first-stage stretching roller group C, D consisting of at least two rollers having a surface roughness (RMS) of 0.3 to 3.0 μm. The first stage drawing is performed immediately before reaching the roller group.

In the process of simultaneously drawing eight or more multi-filaments, it is necessary to hang the yarn feeding rollers C and C'at the same time as at least the first-stage stretching roller. On the other hand, if a Nelson roller is used as the first-stage drawing roller, a long and heavy roller is required, which not only causes a problem in terms of high price and safety, but also causes a twist angle of the inter-roller yarn. This is unsuitable because it causes a decrease in stretchability and an increase in fluff that occur due to the increase in size.

Further, the first-stage first-stage stretching roller groups D and E of the present invention are composed of two or more roller groups, and usually consist of a combination of two rollers D and E as shown. . It is essential to use rollers having a surface roughness (RMS) of 0.3 to 3.0 mμ for both of these two rollers D and E. The first roller D of the first-stage drawing roller group grips the yarn K on the roller surface and completes the first-stage drawing performed between the yarn supplying roller groups C and C '. Perform a function.

Both the first-stage stretching roller groups D and E are required to have a surface roughness (RMS) in the range of 0.3 to 3.0 μm. It is possible to surely complete the first-stage stretching on the roller D and the smooth second stage without stress concentration at the stretching start point of the second stage (closest to the downstream side of the outlet of the first roller D). It becomes possible to perform eye stretching. As a result,
The fluff due to filament breakage can be significantly reduced, and at the same time, yarn breakage can be significantly reduced, and a high-quality raw yarn can be manufactured with high yield.

The surface roughness RMS of 0.3 to 3.0 μm of the first-stage stretching roller groups D and E corresponds to the surface roughness of 4 to 8S. The roller surface temperature is 100 to 180.
It is preferably set in the range of ° C.

On the other hand, in the method disclosed in Japanese Patent Laid-Open No. 245909/1992, the first stage stretching roller group is composed of a mirror surface roller (surface roughness 1S or less) and a satin roller.
It is excellent in that the yarn is securely gripped and the first stage drawing is completed on the first roller surely to stably perform the first stage drawing, but it is the first mirror surface of the first stage drawing roller group. Since a stretching point at the time of the second stage stretching occurs at a position immediately downstream of the outlet of the roller and the portion becomes a stress concentration point, filament breakage easily occurs there. This filament breakage causes fluffing of the product yarn, and further causes the cut filament to wind around the mirror-finished one-sided roller having high friction and induce all yarn breakage.

The stress concentration at the stretching start point in the second stage stretching is the surface temperature of the roller E after the first stage stretching roller group and the subsequent second stage stretching roller group, and the second stage stretching ratio. It was difficult to avoid such conditions as appropriate, as long as the first roller D of the first stage stretching roller group is a mirror surface.

Next, the roller E after the first-stage stretching roller group is subjected to substantially second-stage stretching on this roller, but usually has the same speed and diameter as the first roller D, Although a method of changing only the roller surface temperature is adopted, a high speed of 1.5 times or less and / or a roller diameter can be changed to select another stretching pattern.

Subsequently, as the second-stage stretching roller groups F and F'for completing the second-stage stretching, the same hanging roller group as in the above-mentioned first-stage stretching can be used.
Since the first-stage stretching requires a higher temperature than the first-stage stretching and often requires a heat treatment, when a one-sided roller is used, the roller E and the second stage after the first-stage stretching roller group are used. It is preferable to install a heating element such as a steam heater or a dry heat heater between the stretching roller groups F and F '.

On the other hand, this second stage stretching roller group F, F '
However, since the above-mentioned drawbacks of the Nelson roller are alleviated in this step, it is also practical to employ the Nelson roller for performing a strong heat treatment. That is, the yarn width is narrowed because the drawing has already progressed at the time of the second-stage drawing, and the rollers before this second-stage roller are all one-sided rollers, so the final stage of the second-step drawing is performed. This is because the twist angle of the second-stage stretching roller does not affect the shaded portion.

The method of the present invention is generally applied to the production of synthetic fibers using a melt-spinnable high molecular weight polymer as a raw material, and is a synthetic fiber having high strength and relatively fineness, which is particularly suitable for textiles for industrial materials. It is effective when trying to manufacture.

The method of the present invention is preferably applied to the production of high-strength synthetic fibers of 8 g / d or more, particularly 9 g / d or more, which are suitable for industrial materials, such as polyamide fibers and polyester fibers.

The method of the present invention is a direct spin-drawing method of drawing at a high speed of 3000 m / min or more, and particularly when a plurality of yarns, especially 8 or more multi-filaments are simultaneously drawn and heat treated. Is remarkably exhibited.

[0034]

EXAMPLES The present invention will be further described below with reference to examples. In addition, each physical property in this invention is the value measured by the following method.

(1) Surface roughness (RMS): The following formula (I)
It is expressed by the root mean square roughness of. That is, the square of the deviation from the center line to the roughness curve f (x) is calculated as the measurement length L.
Is the square root of the value integrated over the interval and averaged over that interval. The center line referred to here is a straight line in which, when a straight line parallel to the average line of the roughness curve is drawn, the areas surrounded by this curve and the roughness curve are equal on both sides of this straight line.

[0036]

[Formula 1]

(2) Surface roughness (Rmax): JISB0
It measured based on the standard of 601.

(3) Number of yarn breaks: The number of yarn breaks per 10,000 km of fiber length. In the following example of simultaneous production of 8 yarns, one cut was converted into 8 yarns, that is, 8 times the number was shown.

(4) Number of fluffs: A laser type fluff detector was installed immediately after the turn guide roller that was installed by the winder after the heat treatment for stretching and counted, and the number was displayed per 10,000 km.

(5) Strength / elongation property: measured according to the measuring method of JIS L1017.

[Examples 1 to 6 and Comparative Examples 1 and 2] Nylon 66 chips containing copper acetate at 70 ppm and copper iodide at 70 ppm and potassium iodide at 0.1% by weight (98% sulfuric acid relative viscosity 3.
6) was melt-spun with an extruder type spinning machine. The extruder had four spin packs, and the spinneret holes were arranged so that 1/4 of all the spins were spun from each spinner attached to each spin pack.

The spinning temperature was 290 ° C., and the filter used was a metal filter having 20 μm voids.

A heating cylinder having a length of 20 cm is installed immediately below the base, and the atmosphere temperature at a position 15 cm below the base is 300.
Controlled to ° C. Cold air was blown from the lateral direction to the yarns that exited the high temperature atmosphere in the heating cylinder to cool and solidify. Cold air temperature is 20
C., the wind speed of cold air was 40 m / min, and the air was rectified and sprayed from a 120 cm cold air box.

A normal oil emulsion containing a smoothing agent, an emulsifying agent, an activator, an antistatic agent, etc. as a main component is added to the cooled and solidified yarn so that the content of the yarn is 0.9% by weight based on the weight of the product yarn. The amount was adjusted. The application of the oil agent was performed for each yarn using an oil supply roller.

After refueling, all the yarns were aligned at equal intervals, and the yarns were placed on the take-up rollers A and B, and the take-up speed (that is, spinning speed) was set to 864 m / min. Then,
After 5% of stretch is applied between the yarn supplying rollers C-C ', the yarn is sequentially applied to the stretching roller groups D, E, F, F'and 8
The yarns were simultaneously drawn in two stages and heat-treated, and about half of all the yarns were separately wound on the winder J.

The number of yarns, the take-up roller group, the yarn feeding roller group, the surface roughness of each roller in the first stage drawing roller group, etc. were variously changed as shown in Table 1, and experiments were conducted to obtain the obtained yarns. The results of measuring the physical properties of the strip are also shown in Table 1.

As is clear from the results shown in Table 1, according to the method of the present invention (Examples 1 to 6), it is possible to efficiently obtain a high-quality raw yarn with less yarn breakage and less fluff. .

[0048]

[Table 1]

[Examples 7 to 12 and Comparative Examples 3 and 4] The polymer used for spinning was changed to nylon 6 chips having 98% sulfuric acid relative viscosity of 3.3, the spinning temperature was 280 ° C, and filtration was carried out for 15 times.
Using a metal filter with a gap of μ, 15c below the base
Except that the atmospheric temperature at the m position was 290 ° C., the wind velocity of the cold air during cooling and solidification was 35 m / min, the amount of the oil agent adhered was 0.7% by weight based on the weight of the product raw yarn, and the spinning speed was 844 m / min. In the same manner as in Example 1, melt spinning, two-stage drawing and heat treatment were performed.

At this time, the number of yarns, the take-up roller group, the yarn feeding roller group, the surface roughness of each roller in the first stage drawing roller group, etc. were variously changed as shown in Table 1, and an experiment was conducted to obtain The results of measuring the physical properties of the obtained yarn are also shown in Table 1.

As is clear from the results shown in Table 2, according to the method of the present invention (Examples 7 to 12), it is possible to efficiently obtain a high-quality raw yarn with less yarn breakage and less fluff. It was

[Table 2]

[0052]

EFFECTS OF THE INVENTION When synthetic fibers such as polyamide fibers are produced by the method of the present invention, 8 or more multi-threads can be simultaneously drawn without increasing the length and weight of the roller used for drawing the synthetic fibers and heat treatment. In addition, yarn breakage and single yarn breakage are significantly reduced, efficient production can be performed with high yield, and high-quality fibers with few fluff can be obtained.

The high-quality, high-strength yarn obtained by the method of the present invention is particularly suitable for textiles for industrial materials.

[Brief description of drawings]

FIG. 1 is a process schematic diagram showing a portion after a take-up roller in an example of a direct spinning drawing process to which the method of the present invention is applied,

[Explanation of symbols]

A, B: take-up roller, C, C ': yarn feeding roller,
D, E: 1st stage stretching roller, F, F ': 2nd stage stretching roller, G, G': Heat treatment roller, I: Cheese package, J: Winder, K: Yarn, a: 1st stage stretching roller Area, b: Second stage drawing area

Continuation of the front page (56) Reference JP-A-9-241922 (JP, A) JP-A-8-176963 (JP, A) JP-A-9-268429 (JP, A) JP-A-9-268430 (JP , A) JP-A-4-245909 (JP, A) JP-A-7-278952 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) D01D 1/00-9/04 D01F 1/00-13/02

Claims (3)

(57) [Claims] 1. A melt-spun yarn is cooled and solidified, oiled, taken up at a speed of 500 m / min or more, and subsequently subjected to multistage drawing using a plurality of roller groups and heat-treated to 3000 m / min.
In the method for directly spinning and drawing synthetic fibers wound at a speed of not less than a minute, the yarn feeding roller group before the first stage drawing has a surface roughness (R
max) consisting of a plurality of rollers having a mirror surface of 1 μm or less, the first stage stretching roller group has a surface roughness (RMS) of 0.
The yarn consists of at least two rollers having a matte surface of 3 to 3.0 μm, and the yarn is sequentially hooked on each roller of the yarn feeding roller group and the stretching roller group, and then the second and subsequent stretching steps are performed. A method for direct spinning and drawing synthetic fibers, characterized by being heat treated. 2. The method for direct spinning and drawing synthetic fibers according to claim 1, wherein eight or more yarns are simultaneously drawn and heat-treated. 3. The temperature of the first-stage stretching roller is 100 to 100.
The method for direct spinning and drawing synthetic fibers according to claim 1 or 2, wherein the temperature is 180 ° C.