JPS5817289B2 - youyouyouboushihouhou - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a novel melt spinning method, the purpose of which is to melt spin synthetic polymers such as polyester and polyamide and wind them at a high speed of 2500 m1 min (25 x 104 cx 1 min) or more. The object of the present invention is to provide a method for efficiently producing yarn with excellent uniformity by significantly reducing the take-up tension and reducing the denier unevenness (U%) of the yarn obtained.

Recently, as the development of high-speed winders progresses, 2,500
The so-called "high-speed spinning" in which yarn is wound at a high speed of m/min or higher has come to be carried out, and the conditions obtained by such high-speed spinning are called "partially oriented yarn (POY) J" and are suitable for drawing and false twisting. It is said that

However, in such high-speed spinning, the yarn, which is cooled and solidified by cooling air after being discharged from the spinneret, travels through the spinning tube at a very high speed, so the tension of the spun yarn becomes abnormal due to air resistance. winding stability decreases.

In particular, the most rational and economical method, the "Godetless method", in which the spun yarn is directly taken up by a wine gourd and simultaneously wound up without using a godet roller, cannot be adopted.

Furthermore, the atmosphere of the yarn is disturbed due to the influence of the accompanying air current of the high-speed running yarn, leading to an increase in the denier unevenness (U%) of the condition (this results in a decrease in the uniformity of the product yarn).

The present inventors have conducted repeated research to solve the above-mentioned problems encountered in high-speed spinning, especially in the case of godetless winding. The spun yarn is focused by passing it through a false twisting nozzle using a gas swirling flow or an interlacing nozzle using a gas turbulent flow between the steps (i.e., the first godet roller in the case of using a godet roller, or the wine goose in the case of the godetless method). (b) In this case, since the converging portion goes back upstream, a fairly long section of the traveling yarn is converged into one, thereby significantly reducing the yarn tension; (b) In this case, the convergence starting point (i.e., There is a concern that the upper end of the converging part (the upper end of the retracing part) may move and have an adverse effect on the homogeneity of the yarn, but a convergence start control guide is provided at a specific position below the spinneret.
It has been discovered that when the spun yarn is brought into contact with this, the convergence part is prevented from going back upstream, the convergence starting point is fixed at that position, and a yarn with extremely excellent uniformity can be obtained. It has been reached.

That is, in the present invention, a synthetic polymer is melt-spun to produce 25×104
When winding at a high speed of cTL/min or higher, the spun yarn discharged from the spinneret is cooled and solidified before reaching the first take-up means using a false twist nozzle using a gas swirl flow or an interlace nozzle using a gas turbulent flow. and at the same time give the spun yarn a focusing property, and at the same time make the focusing portion go back upstream, and further start focusing the spun yarn at a position upstream of the nozzle and satisfying the following formula (I). The convergence start point is fixed at that position by contacting with the point regulation guide, thereby reducing the tension of the spun yarn and reducing the denier unevenness (U%) of the wound yarn. be.

(However, L is the distance from the spinneret surface to the guide contact position (cfrL), X is the distance from the spinneret surface to the solidification point of the spun yarn (Cm), and Y is the single yarn denier of the wound yarn ( de
), Z is the winding speed of the spun yarn (crIL/min).

Hail.

) The synthetic polymer referred to in the present invention is a general term for fiber-forming polymers that can be melt-spun, and polyesters and polyamides are particularly preferred.

Polyethylene terephthalate is the most common polyester.

However, in the present invention, not only polyethylene terephthalate but also various copolyesters containing ethylene terephthalate as a main component, and other polyesters such as polytetramethylene terephthalate and polyethylene-2.6-naphthalate may be used.

In addition, although poly-ε-caproamide and polyhexamethylene adipamide are commonly used as polyamides, other polyamides such as upolyamides containing these as main components, PACM polyamides, and polyhexamethylene methyl terephthalamides can also be used. It may be.

These synthetic polymers may contain additives such as matting agents, stabilizers, colorants, antistatic agents, flame retardants, and the like.

In the present invention, the synthetic polymer as described above is melt-spun to produce 2,500
It is applied when winding at a speed of 3000 to 4000 m/min or more (preferably 3000 to 4000 m/min) to produce a multifilament having a single yarn denier of 2 to 14 de.

When the spinning take-up speed is less than 2500 m/min, the effect of air resistance and accompanying air current on the spun yarn is small, so it is not necessary to apply the present invention (and the application of the present invention is not necessary). Since the resulting molecular orientation is small, application of the present invention will result in damage to the yarn, which is not preferable.

According to the present invention, the spun yarn is focused through a false twisting nozzle using a cooling, solidifying, and expelled gas swirling flow or an interlacing nozzle using a gas turbulent flow. must be provided upstream of the first godet roller (or wine goo in the case of a godetless system), and in the normal case, it is provided between the spinning duct outlet and the oiling roller.

In this way, the false twist or interlacing imparted by the nozzle can be traced back upstream and the running yarn can be tightly focused over a long section, thereby almost eliminating air resistance and accompanying airflow of the running yarn. be able to.

However, since the degree of false twisting and interlacing imparted by each nozzle changes depending on the pressure of the air supplied to the nozzle and slight changes in yarn tension, the length of the converging portion is also not constant. The starting point of the convergence (ie, the position of the upper end of the convergence part) is constantly moving up and down, and therefore, the yarn tension is also difficult to maintain constant.

Therefore, in the present invention, the spun yarn is brought into contact with a convergence start point regulation guide at a position upstream of the nozzle and a specific distance (LCIrL) below the spinneret, and the convergence start point is fixed at this position. do.

The contact position of the guide changes depending on the position of the solidification point of the spun yarn, the single yarn denier of the wound yarn, the spinning winding speed, etc., but in any case, it is selected at a position that satisfies the following formula (I). Must.

(However, L is the distance from the spinneret surface to the convergence start point regulation guide (C11'L), X is the distance from the spinneret surface to the solidification point of the spun yarn (CIrt), and Y is the distance of the wound yarn. The single yarn denier (de), 2, is the spinning winding speed (CIrtZ minute).

) The "solidification point" mentioned here is based on "Journal of Textile Machinery Society" No. 18.
It is measured by the method described in Vol. 38, No. 188 (1965).

This position changes mainly depending on the spinning take-up speed and the single filament denier of the spun yarn. For example, polyethylene terephthalate with an intrinsic viscosity [η] of 0.65 in a 0-chlorophenol solution is spun at a temperature of 290° C1 with cooling air. 25°C) at a spray speed of 0.4 ml/sec, the solidification point position (Xcrft) at each single yarn denier (after winding) and take-up speed is as shown in FIG.

In the present invention, the contact position (Lc
The selection of (IrL) is very important, and the selection of (LcrrL) is very important.
) is shorter than the lower limit of formula (I), the spun yarn will be bundled without sufficient cooling, resulting in increased yarn breakage, fluff, and dyeing spots.
On the other hand, if the length is longer than the upper limit of formula (I), the tension of the spun yarn becomes significantly high and the denier unevenness of the yarn also increases.

The above-mentioned convergence start point regulation guide is generally installed inside the spinning duct (spinning cylinder), but this guide becomes an obstacle when threading the yarn that falls from the spinneret at the start of spinning onto a wine goo, etc. The guide is movable, and the threading is retracted to a position separated by light from the yarn path (for example, if there is a guide inside the spinning cylinder during normal operation, it is moved outside) until the threading is completed. It is preferable to advance the yarn to the rear yarn path and bring it into contact with the spun yarn to begin normal operation.

The guide may be made of a hard material such as alumina or ceramic, and may have a rod-like, arc-like, or plate-like shape as long as it allows the running yarn to come into slight sliding contact.

Further, the oil may be allowed to ooze out in a fixed amount from the thread contacting portion of the guide, and in this way, the convergence starting point can be fixed and the oil can be applied (oiling) at the same time.

In addition, when a yarn breakage occurs during spinning, it is preferable that the guide is immediately moved back to a position separated by light from the yarn path (for example, outside the spinning tube), and for this purpose, the guide is linked to a yarn breakage detection device. It is preferable that the guide is moved backward at the same time as yarn breakage is detected.

Next, preferred embodiments of the present invention will be described with reference to the drawings.

FIG. 2 is a schematic diagram showing a preferred embodiment, and in the figure, 1
1 is a spinneret, 2 is a cooling air outlet, 3 is a spinning duct, 4 is a convergence start point regulation guide, 5a and 5b are ballooning regulation guides, 6 is a false twist nozzle or interlace nozzle, 7 is an aspirator, and 18 is an oiling roller. 19 is a wine goo traverse guide, 10 is a wine goo friction roller, 11 is a winding bobbin, F is an unfocused spun yarn, and F' is a bundled spun yarn.

Moreover, FIG. 3 is a partial enlarged sketch of FIG. 2.

In the figure, the spun yarn F discharged from the spinneret is cooled and solidified by the cooling air blown out from the cooling air blowing section 2 in the direction of the arrow, perpendicular to the yarn running direction.

Then, it enters the spinning duct 3 and comes into contact with a horizontally slidable focusing start point regulation guide provided at a position that satisfies the above formula (I), then exits the spinning duct 3 and passes through the ballooning regulation guide 5a. The yarn is introduced into a nozzle 6 that imparts false twist or interlace to the yarn, where false twist or interlace is imparted to the spun yarn, and the convergence due to false twist or interlace is traced upstream, with the upper end regulating the convergence starting point. It is fixed in a fixed position by a guide 4.

(Thus, the yarn F' downstream of the guide 4 always travels in a tightly focused state.

The yarn exiting the nozzle 6 passes through a ballooning regulation guide 5b and reaches an oiling roller 8, where it is applied with an oil agent and then directly heated at a speed of 2,500 m/min or more (preferably 3,000 m/min or more) without passing through a godet roller.
4000-IrL/min).

At the start of spinning, the guide 4 retreats to the outside of the spinning tube, making it easier to thread the yarn (also, when yarn breakage occurs, the guide 4 retreats to the outside of the spinning tube, and the aspirator γ is activated, so that the nozzle 6 It is best to pull the yarn above the .

In this embodiment, an oiling roller 8 is provided downstream of the nozzle 6 to apply the oil, but by doing so, it is possible to prevent the oil from scattering due to the influence of the nozzle 6.

However, if the lubricant is applied upstream of the nozzle 6, there is a problem of the lubricant scattering, but there is an effect that the lubricant is redistributed in the nozzle 6 and the amount of the lubricant deposited becomes extremely uniform.

According to the present invention as described above, the spinning winding speed is 2500 t.
Even when spinning at high speeds of ri/min or higher, the yarn tension is significantly reduced, resulting in good winding performance (and problems such as poor winding appearance, deformation of the bobbin, and abnormal dyeing of the innermost layer of the package due to high tension are eliminated). Not only that, but it also becomes possible to spin and wind the yarn by the godetless method, which was previously thought to be difficult to implement industrially, and is extremely economical.

Furthermore, the obtained yarn has small denier unevenness (U%) and has excellent uniformity.

In particular, if the godetless method is adopted, it is advantageous in terms of equipment cost and space, and the threading work is simplified because threading to the godet roller is not required.

Since the multifilament yarn obtained by the present invention has appropriate cohesiveness, it is particularly suitable for draw false twisting, and reduces fuzz, yarn breakage, dyeing spots, etc. during the draw false twist process compared to ordinary POY. be able to.

Next, examples of the present invention will be described in detail.

Example 1 Polyethylene terephthalate having an [η] of 0.65 was melt-spun using the "Godetless method" using an apparatus as shown in FIG.

At this time, as a spinneret, the hole diameter was 0.35 mmφ and the number of holes was 30.
The spinning temperature was 295° C., and the discharge amount was set so that the single yarn denier after winding was as shown in the table below.

After cooling and solidifying the yarn by blowing cooling air at 25°C from the side at a speed of 40 cm/sec over a section of about 100 cm against the yarn discharged from the spinneret,
The yarn was pulled through a 00 cm spinning duct and passed through an interlace nozzle provided below the duct, then oiled and wound up using a wine goo.

A convergence start point regulating guide as shown in FIG. 3 was provided inside the spinning duct and brought into contact with the spun yarn.

Experiments were conducted by variously changing the spinning winding speed (ZcrfL/min) and the contact position of the guide (LcrrL), and the results shown in Table 1 were obtained.

*Marked examples are outside the scope of the present invention

[Brief explanation of the drawing]

Fig. 1 is a graph showing the relationship between the single filament denier after winding, the spinning take-up speed, and the solidification point position (XCrrL) in melt spinning of polyethylene terephthalate, and Fig. 2 shows a preferred embodiment of the present invention. The schematic diagram and FIG. 3 are partially enlarged sketches thereof. In the figure, 1... Spinneret, 2... Cooling air outlet, 3... Spinning duct, 4... Focusing start point regulation guide, 5a, 5b... Ballooning regulation guide, 6... False twist nozzle or interlace nozzle, 8... Oiling roller-1
9...Traverse guide, 10...Friction roller, 11...Take-up bobbin, F
...Unfocused yarn, F'...Focused yarn, L...Distance from the spinneret surface to the focusing start point regulation guide contact position (1) .

Claims (1)

[Scope of Claims] 1. When melt-spinning a synthetic polymer and winding it at a high speed of 25 x 10'cm for 1 minute or more, the spun yarn discharged from the spinneret is cooled and solidified until it reaches the first take-up means. The spun yarn is introduced into a false twisting nozzle using a gas swirl flow or an interlacing nozzle using a gas turbulent flow between the two, giving focusing properties to the spun yarn and making the focused portion go back upstream, and further upstream of the nozzle and the following. A melt spinning method characterized in that the spun yarn is brought into contact with a focusing starting point regulation guide at a position that satisfies formula (I), thereby fixing the focusing starting point at that position. However, in formula I), L is the distance from the spinneret surface to the guide contact position (cr/l), X is the distance from the spinneret surface to the solidification point of the spun yarn (1), and Y is the winding yarn. Single yarn denier (de) of the yarn, Z is the winding speed of the spun yarn (x/min)
. 2 In the method of 1 above, the convergence start point regulating guide is provided movably, the guide is kept away from the yarn path from the start of spinning until the end of threading, and the guide is moved away from the yarn path after threading is completed. A melt spinning method characterized by bringing the yarn close to the spun yarn and bringing it into contact with the spun yarn to enter steady operation. 3 In the method of 1 above, after the yarn coming out of the false twisting nozzle or the interlace nozzle is brought into contact with an oiling roller to apply an oil agent, the yarn is not passed through a godet roller (it is directly wound with a winder). Method.