JPH0325527B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to an improvement in the manufacturing method of a false twisted design yarn having a mixture of convergent portions and bulky portions.

[Prior art]

Conventionally, when false twisting thermoplastic synthetic fiber yarn,
A method for producing a false twisted design yarn having a mixture of bundled portions and bulky portions by varying the yarn length between a heater and a twisting device to vary the number of twists per unit length of yarn and the heat setting effect. This method is disclosed in Japanese Patent Publication No. 51-222, but this method requires a complicated device for changing the thread path, resulting in high manufacturing costs.

[Purpose of the invention]

The purpose of the present invention is to solve the above-mentioned conventional problems,
To provide a method for inexpensively manufacturing false twisted design yarn with a large apparent diameter ratio between a bundled part and a bulky part and rich in design effects using a simple device.

[Structure of the invention]

In the present invention, three polyester filament yarns having a birefringence △n of 0.02 to 0.15, which have been actually twisted with a twist coefficient in the range of 4,500 to 15,000, are wound around each pin using a pin spinner. This is a method for producing false-twisted design yarn, which is characterized by passing the yarn in a zigzag pattern and subjecting it to false twisting.

To explain the present invention in more detail, a spinner used in a normal false twisting machine has one pin 2 as shown in Fig. 1, and the yarn 1 is wound around the pin 2 once for processing. The spinner used in the invention has 3 pins.
During processing, as shown in Figure 2, the thread is not wrapped around each pin 3, 4, 5, but is passed in a zigzag pattern between each pin 3, 4, 5. is applied unevenly and untwisted unevenly, and the twist density of twisting and untwisting becomes uneven along the yarn length direction. This unevenness in twist density is due to the frictional resistance between the pin and the yarn, but this frictional resistance varies depending on the material of the pin, the contact length between the pin and the yarn, the angle between each pin, etc. should be taken into consideration.

Of course, the unevenness of the twist density changes depending on the number of pins, but it is necessary to consider threading performance and the balance between the pin head and the pin body, and in reality, three pins are most preferable. With two pins,
Although the pin rotates, almost no twist is applied to the thread, and no bulky parts appear.

In addition, in the case of four pins, although it is possible to obtain the desired yarn, threading becomes complicated, and the center of gravity of the spinner shifts to the pin head, resulting in an extremely unbalanced pin. This can easily cause problems such as pins popping out during machining.

When performing the false twisting process, one of the key points of the present invention is to use a three-pin spinner and thread the thread in a zigzag pattern between each pin. is 0.02 or more
0.15 or less, and pre-twist coefficient of 4500 or more 15000
It is necessary to have the following actual twist.

Normal polyester drawn yarn has △n of 0.16 to 0.20
Even if such yarn is used, it is not possible to immediately obtain the desired design yarn simply due to the non-uniformity of the twist density; Set the false twisting temperature to
In addition, the processing speed must be extremely low in order to promote the temperature trench effect, and the resulting decorative yarn is coarse and hard, and the bulking effect of the bulky part due to crimping is not sufficient, and the diameter ratio with the converging part is low. is also 2 or less, resulting in poor design effect.

On the other hand, highly oriented undrawn yarn in the range of 0.02≦△n≦0.15 responds sensitively to unevenness in twist density, that is, changes in tension, so there is no need for high-temperature false twisting and it can be easily Causes morphological changes.

A supplied yarn with Δn of less than 0.02 can provide the desired design yarn, but is difficult to handle due to changes in yarn properties over time, etc., and is therefore not practical. On the contrary, △n
Yarns exceeding 0.15 approach ordinary drawn yarns, making it difficult to obtain a sufficient design form.

When polyester filament yarn with 0.02≦△n≦0.15 is subjected to false twisting using a three-pin spinner, a designed yarn with a diameter ratio of 3 or more in the bundled part and bulky part is obtained.The length of the bundled part is short and it looks very tight. It becomes a spot-like form.

This problem can be solved by giving the polyester filament yarn a real twist with a twist coefficient of 4,500 to 15,000 in advance. For twist coefficients less than 4500, the length of the focal part cannot exceed 1 cm, and for twist coefficients less than 15000
In the above case, on the contrary, the bulky part is restrained by the twisted structure,
become less likely to appear.

The present invention will be explained in more detail with reference to Examples below.

〔Example〕

Polyester filament yarn with △n of 0.11
Four 150d/48f yarns were twisted in the S-twist direction at a twist rate of 300T/M using a false twisting machine equipped with a spinner as shown in Figure 2 at a heater temperature of 210°C and a processing speed.
When processed at 50 m/min and spindle rotation speed of 11 x 10 ⁴ rpm, as shown in Fig. 3, the length of the focusing part A is 1 to 8 cm, the length of the bulky part B is 1 to 4 cm, and the length of the bulky part B is 1 to 8 cm.
A false twisted design yarn with a rich design effect and an apparent diameter ratio of about 8 to the bundled part A was obtained.

〔Effect of the invention〕

According to the present invention configured as described above, it is possible to inexpensively produce a false twisted design yarn having a large apparent diameter ratio between the convergent part and the bulky part, which is rich in design effects, with a simple device. The industrial effect is extremely large.

[Brief explanation of the drawing]

Fig. 1 is a vertical cross-sectional view of a conventional one-pin spinner, Fig. 2 is a longitudinal cross-sectional view of a three-pin spinner used in the present invention, and Fig. 3 is a longitudinal cross-sectional view of a three-pin spinner used in the present invention. In the side views of FIGS. 1 to 3, 1 is a polyester filament yarn, 2, 3, 4, and 5 are pins, A is a converging portion, and B is a bulky portion.

Claims (1)

[Claims] 1 Three polyester filament yarns with a birefringence △n of 0.02 to 0.15, which have been actually twisted with a twist coefficient in the range of 4500 to 15000, are twisted into a zigzag shape using a pin spinner without winding the yarn around each pin. A method for producing false-twisted design yarn, which is characterized by passing the yarn through a false-twisting process.