KR830000999B1 - Self crimping yarn process - Google Patents

Abstract

Oriented textured filaments are manufd. by melt spinning a thermoplastic through a spinneret contg. 2 orifices, merging the 2 streams formed, and quenching. Thus, a spinneret was constructed with a 1st orifice tapering 30≰towards a 0.013-in.-diam. exit and a 2nd orifice with a 0.044-in.-diam. counterbore inclined at 15≰to the spinneret plate and having a 0.013-in.-diam. exit situated 0.043 in. from the 1st orifice exit. Nylon 66 was melted and spun at 2.83 g/min through the spinneret, quenched by a transverse air stream moving at 773 yd/min, and drawn to draw ratio 2.0 to form an 18-denier filament which produced substantial crimp on heat relaxation.

Description

Melt Spinning Method of Filaments Textured from Melt Spinning Polymers

The accompanying drawings are vertical cross-sectional views showing a preferred embodiment of the composite spinneret orifice according to the present invention.

FIELD OF THE INVENTION The present invention relates to a melt spinning method of texturized filaments, and more particularly, to a method of melt spinning a texturized filament during a melt spinning process.

Conventional pivott, U.S. Patent No. 3,387,327 (consistent with the references herein), has a magnetic crimp obtained by switching two basics at an immersion point with nearly different velocities near the front of the spinneret. The filaments are described. Typically, the composites are quenched to produce a filament that is stretched and simultaneously crimped. At present, the magnetic crimp induced by this method can cause the amplitude of the molten base near the confluence of the base under any spinning condition, and also produce the filament with highly modified denier.

Accordingly, the present invention provides a method of melt spinning filaments processed by texturing which avoids such amplitudes and can produce filaments having almost uniform deniers.

A first aspect of the present invention is a method of melt spinning a textured filament from a melt-spun polymer, wherein the first melt portion of the primary flow with the polymer is generated, and the second melt portion of the melt with the polymer is generated. (Where the first and second base flow portions have a scalable flow of nearly different components), and convert the first and second base flow portions to immerse the composite flow at about the same rate, and also quench the composite flow to filament It provides the melt spinning method characterized in that.

Another feature of the present invention is to recover the filaments from a single flow in selecting the spinning speed such that the filaments have an elongation of 90% or less.

Another characteristic of the present invention lies in the selection of the spinning speed such that the filament has an elongation of 45% or less.

Another characteristic of the present invention is the stretching of the filament within 3 seconds after solidifying the single flow into the filament.

It is a characteristic of the present invention that the first and second basic part have approximately the same amount of runoff ratio.

Other features of the present invention will be described in part below, and in part in conjunction with the accompanying drawings. The accompanying drawings in the present invention are vertical cross-sectional views showing a preferred embodiment of the composite spinneret orifice according to the present invention.

This figure shows the spinneret plate 20 provided for imparting divert flow (expandable flow) through the conical passageway 22. The second passage extends to the plate 20 to impart non-expandable flow, which includes a cylindrical counter bore 24 with periodic rotation to the right and a cylindrical orifice 26 with periodic rotation to the right, have.

This causes passage 22 and orifice 26 to divert the first and second fundamentals into the composite flow just below the bottom of plate 20. The volume of passage 22 and orifice 26 are chosen such that the two base streams have approximately the same velocity at the transition phase and preferably the two base streams have approximately the same amount of runoff ratio. In the light of the prior art, the two basic streams will be almost rheologically different because their outflow through each passageway is different before being converted into the composite stream. This rheological difference results in quenched yarns from the composite flow when the yarns are oriented before the rheologically different ones. This can be done by subdividing or separating and stretching steps within about 3 seconds after solidifying the composites into the filaments, or if the spinning rate is chosen such that the resulting filaments have an elongation of less than 90% (preferably less than 45%) It can be done without stretching step. That is, it should be noted that the base polymers through the passage 22 have an excellent expandable flow, while the base polymers through the orifice 26 flow to some extent or have no expandable flow.

The preferred interior angle of the conical surface specifying passage 22 is 30 ° and the axes of counterbore 24 and orifice 26 are parallel to the closest axis of passage 22. That is, the axes of the counterbore 24 and the orifice 26 are preferably inclined at 15 ° with respect to the straight line of the upper flat side opposite the lower surface of the plate 20.

Moreover, the presently preferred volume is a diameter of 0.013 inches (0.033 centimeters) for the orifice 26 and also for the bottom or outlet of the passage 22. The spacing between the center of the bottom or outlet end of the passage 22 and the orifice 26 is preferably 0.043 inches (0.109 centimeters). The volume of the counter bore 24 is chosen such that the two main streams from the passage 22 and the orifice 26 have approximately the same speed and preferably approximately the same amount of outlet. In a preferred embodiment, the orifice 26 is 0.015 inches (0.0356 centimeters) long while the counter bore 24 has a diameter of 0.044 inches (0.112 centimeters).

Example 1

The nylon 66 polymer of apparel average molecular weight is extruded at a rate of 2.83 grams per minute through the composite orifice described above comprising passages 22 and orifices 26. The resulting composites are usually quenched by transverse air at a spinning speed of 773 yards per minute (706 meters) and then immediately drawn to a draw ratio of 2.0 to obtain a stretched filament having 18 deniers. Upon relaxation of the filament, a substantial crimp is formed.

Example 2

Example 1 is repeated except that the spinning speed is increased to 5,500 yards per minute (5,000 meters). Upon relaxation of the filament, substantial crimping is improved. The filament has an elongation of 37%.

Example 3

Example 2 is repeated except that the polymer is polyethylene terephthalate, yield is 6.96 grams per minute and the spinning speed is 6,000 yards (5,400 meters) per minute. The filament has an elongation of 42% and, upon relaxation, substantially improves bulkiness.

Claims (1)

A method of melt spinning a texturized filament from a molten radioactive polymer, the method comprising: generating a molten first base flow portion with the polymer, generating a molten second base flow portion with the polymer, wherein the first and second The base flow portion has an expandable flow of almost different portions), converting the first and second base flow portions into the composite flow at about the same speed, and quenching the resulting composite flow into a filament. Melt spinning of textured filaments.

Images