JPH0197206A - Spinning and direct drawing of latent bulky yarn - Google Patents

Abstract

PURPOSE:To obtain latent bulky yarn having excellent bulkiness by spinning and direct drawing method, by making latent bulk yarn by melt spinning, opening the yarn between a take-up roll and a draw roll by a fluid spray device and heat-treating. CONSTITUTION:In making latent bulky yarn by melt spinning, preheating by a take-up roll and directly drawing the yarn by a drawing roll in a specific draw ratio, the yarn is opened and heat-treated between the take-up roll and the drawing roll by a fluid spray device preferably at >=200 deg.C fluid temperature and >=8Nm<3>/hr flow rate of the fluid. The drawing speed is preferably >=2,500m/min.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a method of melt-spinning latent bulky yarn, preheating it with a take-up roller, and then continuously stretching it with a stretching roller without first winding it up. It is something.

(Prior art) Conjugate fibers, fibers with different shrinkage characteristics within a single yarn such as anisotropically cooled fibers, fibers that are a mixture of single yarns with different shrinkage characteristics, fibers with differences in shrinkage in the length direction, etc. is widely known as a latent bulky yarn because it becomes bulky through heat treatment.

(Problems to be Solved by the Invention) When attempting to obtain such a latent bulky yarn by melt spinning it, preheating it with a take-up roller, and then directly stretching it to a predetermined magnification with a stretching roller, it is difficult to obtain a yarn with poor bulkiness. The problem arises that only things can be obtained.

An object of the present invention is to solve the problems of the prior art and to provide a method for producing a latent bulky yarn with excellent bulkiness by a spinning direct drawing method.

(Means for Solving the Problems) As a result of intensive studies to achieve the above object, the inventors of the present invention have found that if fiber opening and heat treatment are performed between the take-up roller and the drawing roller in direct spinning and drawing, We found a good thing and arrived at the present invention.

That is, in the present invention, when a latent bulky yarn is melt-spun, preheated by a take-off roller, and then directly stretched to a predetermined magnification by a drawing roller, a fluid jetting device is used between the take-up roller and the drawing roller. This is a spinning and direct drawing method of latent bulky yarn, which is characterized by opening and heat treatment.

In the present invention, latent bulky yarn refers to fibers that have a difference in shrinkage characteristics within a single yarn such as conjugate fibers and anisotropically cooled fibers, and fibers that have a difference in shrinkage characteristics between single yarns such as a mixed fiber yarn with different shrinkage. It refers to all fibers that develop bulkiness through heat treatment, such as fibers that have a shrinkage difference in the longitudinal direction and fibers that have a shrinkage difference in the length direction. Particularly, remarkable effects can be achieved when applied to a latent bulky yarn with a dumbbell-shaped hollow cross section, as described in JP-A No. 60-151310.

FIG. 1 is a schematic diagram showing an example of an apparatus for carrying out the method of the present invention, in which a yarn Y discharged from a spinneret 1 is cooled by cooling air from a spinning tube 2, and an oiling roller 3
After refueling with the take-off roller 4 and take it off with the take-off roller 4,
and the stretching roller 5, the film is directly stretched to a predetermined magnification. The take-up roller 4 is normally heated at a temperature suitable for drawing the yarn Y.
For example, in the case of polyester fiber, it is preheated to 85° to 110°C. A stretching speed of 2.500 m/min or higher is preferred because particularly good bulkiness can be obtained. Further, a fluid ejecting device 6 is provided between the take-up roller 4 and the stretching roller 5, and the yarn Y is opened and heated. The fluid ejecting device 6 is desirably one that has both a filament opening action and a thread feeding action as shown in, for example, Japanese Patent Application Laid-Open No. 57-66139. The heating fluid may include hot air, hot air, etc.
Superheated steam or the like is used. The temperature of the heating fluid is 20
It is preferable that the temperature is 0°C or higher and the injection flow rate is 8 Nm"/hour or higher in order to improve bulkiness. In particular, when the stretching speed is 2,500 m7 minutes or higher, the temperature of 200°C or higher and the injection flow rate of 8 Nm" /hour or more is required.

In the case of latent bulky yarn, it is necessary to open the yarn using a fluid jet device and heat it. This is unsuitable because the bulkiness becomes uneven and furthermore, the yarn running position on the roller fluctuates, causing yarn breakage. The method of the present invention can be applied to all fibers that can be melt-spun, such as polyester fibers and polyamide fibers, but particularly good results can be obtained when applied to polyester fibers.

(Example) Hereinafter, the method of the present invention will be explained in more detail with reference to Examples.

In addition, in Examples, bulkiness was measured by the following method.

(1) Stretched sample with length measuring machine to 16.00010e
Roll it up to create a skein.

(2) Fold the windshield removed from the frame of the measuring machine in two.
Tie both ends with thread.

(3) Next, hang this sample on a hanger, hang a 6 g weight from the bottom end, and place it in a dryer.

(4) After heat-treating in a dryer at 180°C for 5 minutes, take out the sample, cut off one end with scissors, and with the cut side facing down, shake it from side to side to loosen the threads thoroughly. .

(5) Thereafter, insert the sample into the groove 11 of the measuring device shown in FIG. 2, place a 6 g flat weight 12 on it, read the scale 13, and measure the height of the sample. Change the orientation of the sample, repeat the measurement three times, and find the average value (Hmm).

In addition, the length of the groove 11 of the measuring device is 10 cm, the width is 1 cm,
The radius of the bottom is 0.5 cm. Further, the length of the flat plate weight is 12 (J), and the width is 0.9 cm.

(6) Next, both ends of the sample are cut off to match the sides of the groove 11 of the measuring device, and the weight of the sample after cutting is measured using a chemical balance (Wg). (7) The bulkiness is expressed by the following formula.

Example 1 Polyethylene terephthalate with an intrinsic viscosity of 0.45 and polybutylene terephthalate with an intrinsic viscosity of 1.05,
The composite materials were combined in a side-by-side manner at a weight ratio of 50%:50%, and directly drawn by spinning using the apparatus shown in FIG. In this case, the temperature of the take-up roller 4 is 90°C, and the take-up speed is 1,600°C.
The temperature of the stretching roller 5 was room temperature (not heated), the stretching speed was 2,800 m/min, and the fluid injection device 6 used was the one described in Japanese Patent Application Laid-Open No. 57-66139. , 240°C hot air was used as the heating fluid, and the flow rate was 9
．． ONm3/hour. The yarn obtained was 75 denier/24 filaments, and the bulkiness was 45.
It was good.

On the other hand, for comparison, when the stretching roller 5 was heated to 180°C and heat treated without using the fluid ejecting device 6 and without performing fiber opening or heat treatment, the bulkiness was as low as 21. The thread running position on the roller fluctuated, resulting in frequent thread breaks.

Example 2 Polyethylene terephthalate dumbbell-shaped hollow fibers were melt-spun using the method described in Example 1 of JP-A No. 60-151310, and then spun using the apparatus shown in FIG. 1 without winding. A yarn of 75 denier/36 filaments was obtained by continuous drawing.

The preheating temperature of the take-up roller 4 is 100°C, and the fluid injection device 6 used in Example 1 is provided between the take-up roller 4 and the stretching roller 5, and 240°C steam is flowed ff19.
．． It was sprayed at a rate of ON m'/hour, and the yarn was opened and heat-treated. Further, the take-up speed (peripheral speed of take-up roller 4) and stretching speed (peripheral speed of stretching roller 5) were changed as shown in the following table.

The bulkiness of each yarn obtained is as shown in the table below, and it can be seen that the higher the drawing speed, the better the bulkiness is, and particularly good bulkiness is obtained at a drawing speed of 2.500 m/min or higher. .

(Effects of the Invention) According to the method of the present invention, a yarn with high bulkiness can be obtained at low cost by the direct spinning method, and a novel bulky textured yarn that can replace the conventional false twisted textured yarn is provided. be able to.

[Brief explanation of the drawing]

FIG. 1 is a schematic view showing an example of an apparatus for carrying out the method of the present invention, and FIG. 2 is a perspective view of the bulkiness measuring apparatus. 4... Take-up roller, 5... Stretching roller, 6... Fluid injection device.

Claims (1)

[Claims] 1. When melt-spinning the latent bulky yarn, preheating it with a take-up roller, and then directly stretching it to a predetermined magnification with a stretching roller,
A method for direct spinning and drawing of latent bulky yarn, which comprises opening and heating treatment using a fluid jet device between the take-up roller and the drawing roller. 2. The method according to claim 1, wherein the stretching speed is 2,500 m/min or more. 3. The method according to claim 1 or 2, wherein the fluid temperature in the fluid ejecting device is 200° C. or higher, and the fluid flow rate is 8 Nm^3/hour or higher.