JP3130640B2 - Method for producing polyester fiber - 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 producing a polyester fiber yarn having a large monofilament fineness and a multifilament yarn by using a direct spin drawing method.

[0002]

2. Description of the Related Art When a single fiber (also simply referred to as a filament or a single yarn) has a large denier, a method for producing a polyester fiber yarn is generally to wind a polyester yarn melt-discharged from a spinneret once. After winding
A method of obtaining a product by performing high-magnification stretching in another step (generally F
OY), but in this method, the production cost is high because the product is obtained through two steps, and the single fiber denier is thicker and the consumption when loomed on a loom is more constant than the fine denier product. Due to the large number of hits, the number of loading on creels has increased, making it difficult to respond and rationalize in the market.

[0003] Therefore, the production cost is reduced by the direct spinning and drawing method (generally called SDY) when the single fiber denier is large, and the response and rationalization in the market are performed. In order to cope with this problem, first, since the single fiber denier is large, it is difficult to perform the direct spinning and drawing method in one-stage drawing, and there is a method of performing a two-stage or more drawing process to obtain a product.

Conventionally, in the single-stage direct spinning and drawing method, when the denier of single fiber is large, the applied oil is not uniformly attached to the spun filament, so that it is taken up by a first preheating roller, drawn and heat-set by a second heating set roller. However, the resulting product looks darker with more dye in the unstretched portion than in the stretched portion, and the product value is not preferable because it is inferior.

Further, in the single-stage direct spinning and drawing method, when spinning is performed at a higher speed, the discharge rate is further increased, so that the spinning tension is lowered and cooling is insufficient, and conversely, U% is deteriorated. , And it is necessary to perform stretching at a higher magnification, and the unstretched constitution remains.

[0006] Therefore, yarn has been produced so as to be free of yarn unevenness in the low speed direction in which the discharge amount is reduced. However, even if unstretched remains, or even if the draw ratio is increased to the limit in order to eliminate unstretched, it is difficult to apply to the roller. This increased winding and was undesirable in the production process.

Further, in the two-stage direct spinning and stretching step, according to the method disclosed in Japanese Patent Application Laid-Open No. Hei 3-161545, a pretension roller having a small diameter is provided immediately before the first take-up roller, and the first take-up roller and the pre-tension roller are connected to each other. A method of performing cold stretching at a stretching ratio of 1.03 to 1.10 between tension rollers has been proposed.

However, in this method, the same method in which a pretension is applied between a supply roller and a heating roller in a stretching method performed in a conventional separate drawing process is replaced with a straight drawing method. In addition, the cost merit as a capital investment when producing thick denier products is low, which is not preferable.In addition, products with total denier of 200 de or more are not unstretched and have good process condition. Not enough yet.

Also, the direct spinning and drawing method of similarly performing two-stage preheating and drawing with a heating roller is not a preferable direction in terms of equipment investment, and furthermore, since the heat shrinkage stress is different, the physical properties of the conventionally obtained polyester fiber are different. Unlike the behavior, it is not preferable for the intended use.

[0010] Further, in the method of applying an oil agent when the single fiber denier is large, the method of applying an oil agent in the shape of the oil agent application guide described in JP-A-3-199460 is made oblique to widen the spun single fibers. However, this method has an effect when the oil agent is applied to each single fiber, but has an effect of having a number of filaments of 36 holes or more. Is difficult.

[0011]

DISCLOSURE OF THE INVENTION The present invention solves the above-mentioned problems of the prior art, and provides a process for producing a multifilament polyester fiber having a large monofilament denier and a large total denier fineness. Another object of the present invention is to provide a production method capable of stably obtaining a high-quality product free from spots and the like.

[0012]

That is, in the present invention, a polyester fiber having a spinning take-off speed of 1200 m / min or less, a single fiber denier of 4 de or more after drawing, a total denier of 200 de or more, and a filament count of 36 or more filaments is used. In producing polyester fiber by direct spinning and drawing without winding, before applying the oil agent, the spun yarn is brought into contact with a rod-shaped spinning guide to open each filament, and then the oil agent is applied by an oil agent supply roller. Subsequently, two or more, preferably three or more rod-shaped opening guides are further opened, and at this time, the first opening guide is placed at a position where the contact angle is 5 ° or more and 30 ° or less with respect to the first opening guide. A method for producing a polyester fiber, comprising: setting a second fiber opening guide, drawing the fiber through a first take-off roller via the guide, and then stretching and winding the fiber. Is the law.

In the present invention, in the case where a single-filament denier is thickened by a single-stage direct spinning and drawing method, and a yarn having a large total denier and a large number of filaments is produced, a rod-shaped yarn is applied before the oil agent is applied to the yarn. It is important that each filament is opened by the spinning guide described above, and an oil agent is applied by an oil agent supply roller.

In order to uniformly apply an oil agent to a multifilament having a weight of 4 or more on one oil agent supply roller, the filament is brought into contact with a rod-shaped spinning guide to open the filament.
It is desirable to apply the present single oil agent.
By and widening changing the spinning guide width on oil supply roller by the method described in 9460 JP is also possible with this to uniformly adhere the oil well, but the filament on the oil supply roller excessively wider It is unfavorable because it sways to the right and left with traveling and the oil agent is not applied while being properly fixed on the rollers.

The rod-shaped spinning guide is preferably 50 to 100 mm above the position where the oil agent supply roller and the filament come into contact with each other, even if the rod-shaped spinning guide is bent so as to come into strong contact with the filament. ,
60 to 80 mm is desirable. If the length is less than 50 mm, the spinning tension is excessively applied, leading to yarn breakage. If the length exceeds 100 mm, the tension is not applied and the cooling is not progressing.

The contact between the filament and the spinning guide is preferably such that the filament is pushed 3 to 10 mm deep from the position where the filament contacts with the oil supply roller when the spinning guide is not attached, and preferably 4 to 6 mm. If it is less than 3 mm, it is difficult to sufficiently improve the spots, particularly the constitution of the undrawn yarn. Further, if the cover is set at a position exceeding 10 mm, the bending angle becomes large, so that the whole spots appear patchy, and the spinning tension tends to be abnormally high, which tends to lead to the cause of thread breakage.

Next, after the oil agent is applied, 2
It is important that at least three or more preferably three or more rod-shaped fiber-opening guides open the oil-supplied filament and take it to the first take-off roller.

[0018] This is because even when the oil agent is uniformly applied to the filament, the filament to which the oil agent is applied is bundled with the bundle when the oil agent is taken up by the first take-up roller and drawn by the second take-up roller (drawing roller). If the bundles are bundled in a distorted form and are taken up by the first take-up roller, the preheating effect of the first take-up roller will not be exhibited, so that the thick single fibers that do not contact the roller surface are undrawn, which is not preferable. Further, a method of increasing the surface temperature of the first take-off roller in order to exhibit the preheating effect has been proposed.

Therefore, it is important to open the filaments to which the oil agent is uniformly applied one by one, and at least two, preferably three or more bar-shaped opening guides are provided below the oil agent supply roller as means for opening the filament. It is necessary to spread the multifilament.

At this time, it is desirable that the first fiber opening guide below the oil agent supply roller has a groove width capable of fixing the filament in a rod-like shape with a drum guide. Is preferred, and 4 to 6 mm is desirable. If the groove width is less than 4 mm, not only is it difficult for the filament to be spread, but the effect of the spinning guide installed to spread each filament on the oil supply roller and uniformly apply the oil is reduced by half. It becomes easy to cause unstretching. On the other hand, if the groove width is 10 mm or more, it is difficult to fix the respective filaments, and it is difficult to uniformly apply the oil agent, and the yarn sway on the first take-off roller increases, which is likely to be a factor of the broken yarn.

Next, the second opening guide below the oil agent supply roller is set at 80 to 150 degrees from the first opening guide position.
mm, particularly preferably 100 to 120 mm below, and the shape is located on the front side when viewed from the front of the first opening guide, that is, after the oil agent is uniformly applied by the first opening guide. Each of the filaments of each single fiber to which the oil agent is applied is opened by this guide.

The angle and the contact angle when the first opening guide and position the spun filaments and the second opening guide is in contact with the first and second th opening guide is in this case is preferably θ and result 5 ° or 30 ° or less,
Desirably, it is in the range of 10 to 15 °. When the angle is less than 5 °, the filaments are hardly opened and become bundled, so that undrawing easily occurs. If the angle exceeds 30 ° , the tension applied to the filament in the second opening guide becomes too high and the stick-slip becomes large, resulting in poor spotting and high-tensile thread breakage.

Further, the third opening guide serves to further fix the filaments opened in the second, and the positions of the second and third opening guides are the first and the second. Although the position is preferably symmetrical with the position of the second opening guide, the third opening guide does not necessarily have to be symmetrical.

In the case of the above-described method, when a polyester filament having a denier of 4 denier or more, a total of 200 denier or more, and a filament of 36 filaments or more is formed, the spinning take-off speed is preferably 1200 m / min or less.
It is preferably from 00 to 1000 m / min. At a take-off speed exceeding 1200 m / min, the discharge rate is 80 to 100 g / min per spindle, and the non-uniform stretching is performed due to insufficient cooling in one-stage stretching and insufficient magnification, which is difficult to commercialize. On the other hand, when the flow rate is less than 600 m / m, the discharge amount is small and uniform oiling is applied well, and the one-stage stretching quality and the process condition can be performed without any problem.

[0025] The drawn-up product melted and discharged at a spinning take-off speed of 1200 m / min or less is a single filament of 4 denier or more, a total denier of 200 de or more and a polyester filament of 36 filaments or more is subjected to a fiber opening step and then a first take-off roller. The glass is preheated at a temperature equal to or higher than the glass transition temperature, and is stretched by the second drawing roller.

At this time, the surface temperature of the first take-off roller is 8
The temperature is preferably 5 to 105 ° C, more preferably 95 ° C. If the temperature is lower than 85 ° C., uniform preheating cannot be applied to each filament, so that undrawing is liable to occur. If the temperature exceeds 105 ° C., the yarn sway increases on the first take-off roller and over-heating of the filament occurs. There is a strong tendency for spotting to be defective and a patchy shading to occur.

The filament drawn by the first pulling roller is stretched by 3.5 to 4.5 times by the second pulling roller. If it is less than 3.5 times, unstretching occurs, and if it exceeds 4.5 times, the elongation becomes low and the process condition may be deteriorated. The heat setting temperature of the second take-off roller is changed depending on the purpose, but is set so that the boiling water shrinkage ratio is in the range of 5 to 10%.

A specific example in which a polyester fiber having a denier of at least 4 de, a total denier of at least 200 de, and a filament count of at least 36 filaments obtained in this manner is drawn by a single-stage direct spinning drawing method. It is shown in FIG. Hereinafter, the present invention will be described with reference to the drawings. FIGS. 1A and 1B are schematic explanatory views of the arrangement of an apparatus suitable for carrying out the present invention, wherein FIG. 1A is a front view, and FIG.
It is an arrow X view.

In the figure, a filament y discharged from a spinning hole of a spinneret (not shown) reaches an oil supply roller 2 via a rod-shaped spinning guide 1, where the oil is uniformly applied. The spinning guide 1 has a diameter of about 5 to 6 mm, and is preferably made of ceramic, particularly preferably alumina oxide (Al ₂ O ₃ ). The oil supply roller 2 has a porous carborundum (made of ceramic) having a diameter of 150 mm and a diameter of 4 to 6 mm.
140-260 mm corresponding to the weight was used.

Next, the filament y has a weight interval of 30 to 4
The first opening guide 3, the second opening guide 4, and the third opening guide 5 having a shape generally called a drum guide disposed below the oil agent supply roller 2 for 0 mm are sequentially contacted and traveled to be opened. The filament y thus opened is taken up by the first take-up roller 6, preheated, enters the second take-up roller 7 (stretching roller), is stretched here, and is taken up by the winder 8. .

At this time, a cold roller 7 ′ (third take-up roller) is provided between the second take-up roller 7 and the take-up machine 8 to change the filament supply speed ratio and change the winding condition for improving the winding appearance. You may. Further, an interlacing device may be provided between the second take-up roller 7 and the cold roller 7 'or between the second take-up roller 7 and the winder 8.

[0032]

The present invention will be described more specifically below with reference to examples.

[0033]

Examples 1 to 3 Polyethylene terephthalate having an intrinsic viscosity of 0.64 and a titanium oxide content of 0.3% by weight was melt-spun at a melting temperature of 290 ° C. using the direct spinning and stretching apparatus shown in FIG. A filament of 5.2 filaments, a total denier of 250 de, and a filament count of 48 filaments of the later product was drawn at a spinning speed of 800 m / min, 1000 m / min, and 1200.
Table 1 shows the draw ratio at m / min, the yarn width and length, strength, elongation, spots, and process conditions at which the running filament on the oil agent supply roller comes into contact with the roller.

At this time, the position of the spinning guide on the oil supply roller is 60 mm above the roller and the contact position is 5 mm.
I went in the pushed position. The contact angle of the first and second opening guides under the oil supply roller was 15 °. In this case, there was no particular problem in process tone and quality. Also,
FO which can obtain warp fluff in the market by another process
Y is greatly improved to 1/3 to 1/4 level, and the product re-input during weaving is directly performed from FOY by the spinning and drawing method.
By replacing Y, it took only 1/3 to 1/4 of the time, which was effective in streamlining the market.

[0035]

Comparative Examples 1 to 3 The same polyethylene terephthalate as in Examples 1 to 3 was used, and a brand having the same product denier after stretching and winding was supplied by the conventional FOY method (Comparative Example 1), as shown in FIG. A normal direct spinning and drawing method (Comparative Example 2) in which the spinning guide 1 above the roller 2 and the second and third opening guides 4 and 5 below the roller 2 are not provided, FIG. A direct spinning and drawing method (Comparative Example 3) by two-stage drawing in which a similar or small-diameter roller 9 (pretension roller) is provided at an upstream position of the take-up roller 6, and a spinning take-up speed of 800
Table 1 shows the results at m / min.

In this case, although there is no problem in quality in Comparative Example 1, the product has many fluffs and is not wound in a large amount, so that it is poor in marketability. In Comparative Example 2, the fiber was not spread on the oil supply roller under the same conditions as in Example 1.
In addition to the undrawn state, the product could not be commercialized, and the oil agent did not uniformly adhere to each filament, and there were very many fluffs and broken yarns.

Comparative Example 3 exhibited some effect because of pre-tension compared to Comparative Example 2, but was less effective than the Example in terms of spotting, and had less fluff than Comparative Example 2. However, it was almost twice as high as that of the example. Also,
The capital investment was considerable, which was not favorable.

[0038]

Example 4 and Comparative Example 4 The same polyethylene terephthalate as in Examples 1 to 3 was used, and the same brand was produced by changing the spinning take-off speed with the same equipment as in the example.
Example 4 had a spinning take-off speed of 580 m / min, and Comparative Example 4 had a spinning take-off speed of 1
The test was performed at 500 m / min.

In Example 4, there was no problem in quality and process condition, but it was not particularly preferable in terms of productivity. In Comparative Example 4, it took an extremely long time to solidify by cooling because the discharge amount was extremely large, and thus the stretching ratio was increased, but this was not preferable because unstretched did not disappear. Also, since the cooling did not proceed, the first take-up roller was severely swayed and the yarn was frequently broken.

[0040]

Examples 5 to 6 In Example 5, the same polyethylene terephthalate as in Example 2 was used for spinning with the same equipment, the spinning take-off speed was the same as in Example 2, and the product obtained after stretching was simply used. A brand having a fiber denier of 6.25 de and a total denier of 225 de / 36 filaments was produced and wound, but there was no problem in quality and process condition.

In Example 6, yarn was produced under the same conditions as in Example 2,
After the stretching, a brand having a single fiber denier of 4.1 de and a total denier of 300 de / 72 filaments was produced and wound up, but there was no problem in quality. However, although cooling was a problem because of the multifilament, 4
Although the process condition was slightly worse than that of Example 2 by increasing the wind speed line below the base and the cooling air as compared with the case of 8 filaments, the production problem was not at a level.

[0042]

[Table 1]

Note 1: The spinning condition is 4 for one winder.
In a single-stage drawing straight-line facility that can take up the weight by spinning,
When a product of 10 kg per spindle is wound up and produced for 7 days by production with six winding machines, the process in which the number of times of thread breakage is less than once / day is ◎;以上: 3 times or more and less than 5 times / day, Δ: 5 times or more / day.

Note 2: The warp fluff is ◎ when the total run length of 500 creels is less than 0.1 per 1 million m and 以上 when 0.1 or more and less than 0.2 per 1 million m in a creel with 500 warps.
0.2 or more and less than 0.3 are defined as Δ, and 0.3 or more are defined as x.

[0045]

As described above, according to the present invention, multifilament polyester fibers having a large monofilament denier and a high total denier fineness can be cut at a high quality in the production process with a higher degree of yarn breakage and fluff than conventional methods. It has a remarkable effect that a product that is less and can respond to market needs can be obtained easily and stably.

[Brief description of the drawings]

FIG. 1A is a schematic layout front view of an apparatus suitable for carrying out the present invention. (B) It is an arrow XX view of the figure (a).

FIG. 2 is a schematic diagram illustrating the arrangement of a conventional device.

FIG. 3 is a schematic layout explanatory view of a conventional device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Spinning guide 2 Oil supply roller 3 1st fiber opening guide 4 2nd fiber opening guide 5 3rd fiber opening guide 6 1st take-up roller 7 2nd take-up roller 8 Winding machine

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ identification code FI D02J 1/22 302 D02J 1/22 302Z (58) Investigated field (Int.Cl. ⁷ , DB name) D01F 6/62 D01D 11 / 02

Claims (1)

(57) [Claims] 1. A spinning take-off speed of 1200 m / min or less, a single fiber denier after stretching of 4 de or more, and a total denier of 20 or more.
When a polyester fiber having 0 filament or more and a filament number of 36 filaments or more is directly spun and stretched without being once wound up to produce a polyester fiber, the spun yarn is brought into contact with a rod-shaped spinning guide before application of an oil agent so that each fiber is run. After the filament is opened, an oil agent is applied by an oil agent supply roller, and subsequently the fiber is further opened with two or more, preferably three or more rod-shaped opening guides. A polyester fiber, wherein a second fiber-spreading guide is installed at a position where the contact angle is 5 ° or more and 30 ° or less, is taken up by a first take-up roller via the guide, then drawn and wound up. Manufacturing method.