JPS6163705A - Method of bundling yarn of melting spinning - Google Patents

Abstract

PURPOSE:To reduce nonuniformity of cold drawing caused by air resistance of multifilament yarn which is not easily bundled right under a solidifying point, by bundling the yarn of thermoplastic polymer at a position within 1 meter from the solidifying point of the polymer only in the direction of cold air flow. CONSTITUTION:In subjecting a thermoplastic polymer such a poloyethylene terephthalate, etc., bundling of yarn of melt spinning is carried out by collecting yarn at a position within 1 meter from the solidifying point of the extruded yarn only in the direction of cold air flow while providing the yarn preferably with a finishing oil or water. The Preferably the extruded yarn has <=1 denier degree of fineness of single filament, >=70 filaments extruded from one spinneret and >=3,000m/min draw velocity of the first godet roller.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to an improvement in a method for spinning multi-filament filaments at high speed, and involves cold spinning due to air resistance for multi-filament fibers that are difficult to converge just below the solidification point. The object of the present invention is to provide a method that can reduce plaque.

BACKGROUND OF THE INVENTION Conventional methods for converging yarns in melt spinning include applying an oil agent with an oiling roller at the exit of the spinning tube and then converging the yarns with a guide.

In recent years, with the increase in spinning speed, focusing just below the solidification point using metering oil (hereinafter referred to as MO) K, which uses a metered lubrication system with an oil discharge nozzle, etc., has been carried out to prevent cold stretching due to air resistance. There is.

However, in the case of multi-filament, the density of threads increases above the MOK, the density of the threads increases above the MOK, the permeability of cooling air deteriorates, and close contact between single threads (single fibers) occurs. Similarly, in the case of ultra-fine yarn with a small single yarn denier, the solidification point is very close to the outlet of the spinneret, so when MO converges just below the solidification point, the yarn convergence angle becomes large and the winding performance of the yarn becomes poor. There was an issue of instability.

Purpose of the Invention The present invention aims to improve the problems of the prior art by:
This method was developed as a result of studying the Yatoken Higashi method, and its purpose is to reduce air resistance within the spinning tube and prevent cold drawing unevenness without reducing the permeability of cooling air.

Components of the Invention In other words, the present invention provides a melt-spun yarn characterized in that when a thermoplastic polymer is melt-spun, the yarn is bundled only in the cooling air blowing direction within 1 m below the solidification point of the spun yarn. This is the eastern prefecture method.

Here, in the present invention, the convergence position of the yarn is set to 1 below the solidification point.
It is necessary to keep it within #I, and preferably 1J, VC, preferably 5001 or less.

This may be because it is difficult to bundle the yarns above the solidification point, and the crystal structure may change due to rapid cooling, resulting in different physical properties. On the other hand, if the yarns exceed ltn from the solidification point, cold stretching due to air resistance has already progressed. Therefore, the effect of focusing is small. The effect is remarkable when the spun yarn has a single yarn fineness of 1 denier or less, a filament count of 70 or more, and a take-up speed of the first godet roller of 3000 sn/min or more.

The present invention will be explained below based on the drawings. 1 and 2 are side and front views of a preferred embodiment of the present invention. In fig.

The yarn Y melt-spun from the spinneret 1 is cooled and solidified by cooling air 2 blown out from one direction, and then focused only in the cooling air blowing direction by a rotating roller 3 installed within 1 m from the solidification point. , and reaches the oiling roller 5 via the front guide 4. Here, the term "fiber-like convergence only in the cooling air blowing direction" does not mean that the cooling air is converged only in the cooling air blowing direction.

As shown in Figures 1 and 2 (in addition to the case where the cooling air is focused from the direction in which it blows out, it also includes the case where it is focused from the opposite direction as shown by the dotted line or from these two opposite directions at the same time, but it is perpendicular to this direction) A direction of 1IIK means no focusing.

In this way, the spun yarn converges on the cooling air blowing side,
Since the direction perpendicular to this direction is not focused, the penetration of the cooling air is not reduced, and therefore effective and uniform cooling can be achieved.

In addition, since the yarn flows down the spinning tube in a two-dimensional, hollow state, air resistance is reduced compared to when the yarn is not converged, and cold drawing unevenness between single yarns is also reduced. The unevenness in the yarn length direction (U% and dyeing unevenness) is greatly improved.

It is preferable to apply water or the like to the one-turn ruler 3 because it is more effective in improving yarn winding stability.

Next, the yarn Y, which has been oiled by the oil ruler 5, is collected by a collection guide 6, taken by a godet ruler 7, and then delivered to a winding device, where it is wound. .

The above is rotary sealer 3. #i! When using oiling roller 5 etc. As shown in Fig. 3 (a constant bar-shaped guide 9 may be used instead of the rotating roller, and a K hi O device 10 may be used instead of the oiling roller 5 (and these may be combined as appropriate). Also, any other arbitrary means may be used. You can also use

Effect of the invention The present invention has the following effects.

(11) In high-speed winding of multi-filament filaments by melt spinning, the accompanying flow of the yarn can be reduced while maintaining the permeability of the cooling air.

(2' The lti vermilion reduces cold-field elongation in the spinning tube of multi-thread filaments, which were conventionally difficult to bundle under the solidification point, and makes it possible to significantly improve dyeing spots, U%, etc.) was completed.

EXAMPLES The present invention will be described in more detail with reference to examples below. 5
Examples of the present invention and comparative examples are shown in Table 1, in which a polyethylene terephthalate multifilament of 0 denier and 100 filaments was wound at a spinning speed of 3900 m/min using the apparatus shown in FIGS. 1 to 3. At this time, the assimilation point was 15 scratches below the cap.

[Brief explanation of drawings]

1 and 2 are a side view and a front view of an arrangement suitable for carrying out the invention, and FIG. 3 is a side view of another arrangement. DESCRIPTION OF SYMBOLS 1... Spinneret, 3... Rotating roller 4... Rod guide, 5... Oiling roller 97... Godet roller tube 9... Rod-shaped guide, 10... MO device patent application Man
Teijin Ltd. 1, -・-1, Agent Patent Attorney Former
1) Hiroshi Jun □Figure 1 Figure 2

Claims (1)

[Claims] 1. A melt-spun yarn characterized in that when melt-spinning a thermoplastic polymer, the yarns are bundled only in the cooling air blowing direction within 1 m below the solidification point of the spun yarns. Row focusing method. 2. The melt-spinning yarn bundling method according to claim 1, wherein the yarn is bundled using a rotary roller while applying an oil or water. 3. Claim 1, wherein the spun yarn has a single filament fineness of 1 denier or less, the number of filaments discharged from one spinneret is 70 or more, and the take-up speed of the first godet roller is 3000 m/min or more, 2. The melt-spinning yarn convergence method according to item 2.