JPH05209334A - Production of specific bulky yarn - Google Patents

Abstract

PURPOSE:To produce specific bulky yarn having excellent handle suitable for casual materials for ladies, having fine curled crimp by using a pin type twister. CONSTITUTION:Two drawn yarns having >=15% difference in heat shrinkage and the number of interlacings of 20-50 interlacings/m are twisted, primarily heat-set, cooled, secondarily heat-set and untwisted. The primary heat-setting is carried out by using a pin heater comprising the following condition. Surface roughness: 2-3s. Effective yarn contact length: 30-90mm. Temperature (H1T): 110-130 deg.C. In cooling after the primary heat-setting, the yarn is cooled to <=the glass transition temperature and the following secondary heat-setting is done at a temperature 30-50 deg.C higher than the temperature of the primary heat-setting.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a special bulky yarn using a pin type false twisting machine.

[0002]

2. Description of the Related Art Various attempts have been made to develop a false twist textured yarn having a spun yarn-like appearance, but the conventional false twist method comprises three steps of twisting, heat setting and untwisting. In the case of an undrawn yarn or a twisted yarn with a bent yarn pass, the necking portion is inside the first heater, so the twist on the hot pin is reduced, the curled crimp is rough, the fabric surface becomes uneven, and a feeling of irritability is felt. There was a drawback. Japanese Unexamined Patent Publication (Kokai) No. 56-328 discloses a method for further improving the appearance and feel of such a textured yarn. Here, a drawn ultrafine single yarn is used and a drawn friction temporary yarn is used. By processing with a twisting machine, fluff is generated, and a product with excellent heat retention is to be obtained.

[0003]

DISCLOSURE OF THE INVENTION The present invention uses a pin type false twisting machine to produce a special bulky yarn suitable for a casual material for women, particularly a special bulky yarn having a fine curled crimp and having a good texture. It is an object to provide a manufacturing method.

[0004]

According to the present invention, two kinds of drawn yarns having a difference in heat shrinkage of 15% or more and an entanglement number of 20 to 50 are used.
The above-mentioned problem is solved by treating the number of pieces / m in a series of steps of twisting, primary heat setting, cooling, secondary heat setting, and untwisting. That is, in the present invention, primary heat setting is carried out using a pin heater having the following conditions, surface roughness 2-3 s effective yarn length 30-90 mm temperature (H ₁ T) 110-130 ° C., and primary heat setting It is characterized in that the temperature of the yarn is cooled below the glass transition point by cooling after fixing and the subsequent secondary heat setting is carried out at a temperature higher by 30 to 50 ° C. than the temperature of the primary heat setting.

In such a method of the present invention, by using two kinds of drawn yarns having a large difference in heat shrinkage, it is possible to produce a crimped yarn having a fine curled crimp. After twisting, primary heat setting is performed at a relatively low temperature of 110 to 130 ° C., and then cooling is performed to bring about a twist setting effect, and subsequently, high temperature heat setting is performed by secondary heat setting, so that stable, Enables the manufacture of products with a good texture.

The temperature of the secondary heat setting (H ₂ T) needs to have a relationship of 50 ° C. ≧ H ₂ T−H ₁ T ≧ 30 ° C. with respect to the temperature of the primary heat setting (H ₁ T). However, this is because if the difference between the secondary heat setting temperature and the primary heat setting temperature is small, the cooling effect after the primary heat setting becomes poor, and conversely, if the secondary heat setting temperature is too high, the heat This is because the effect is too good, the effect of primary heat fixation is reduced, and the effect of feeling is halved.

The yarn obtained by the method of the present invention is finely crimped and has a difference in yarn length caused by primary heat setting. Therefore, when made into a fabric, a softer and rich product is obtained. In the present invention, a product having a crisp taste and a soft texture which has not been obtained in the past can be obtained by combining a modified cross-section yarn, a different denier and the like as the supply yarn in the present invention. The fabric can be made to have a higher quality.

The cooling zone between the primary heat fixing heater and the secondary heat fixing heater must be set to an appropriate length so that the yarn temperature is below the glass transition point, but it is naturally cooled. In general, when the temperature of the heater for primary heat setting is 130 ° C., it is preferable to set the length to 250 mm, and when it is 110 ° C., it is preferable to set the length to 150 mm. It is not preferable to increase the length of the cooling zone more than necessary because the machine base becomes high and the threading operability is high.

[0009]

The present invention will be described in more detail with reference to the following examples. In this example, a polyester stretched yarn 30D / 24f having a heat shrinkage of 23% and a polyester stretched yarn 40D / 18f having a heat shrinkage of 6% were mixed and interlaced.
The mixed yarn of 0D / 42f is used as the supply yarn 1, and as shown in FIG. 1, the feed roller 2, the hot pin heater 3, the first heater 4, the spindle 5, the delivery roller 6, the second heater 7, the feed roller 8, and the winding roller. A crimped yarn was produced under the following conditions using an apparatus composed of the take cheese 9. False twisting yarn speed 95 m / min Number of twists Feed rate (between feed roller 2 and delivery roller 6) -1.1% Temperature of pin heater 3 (H ₁ T) 110-130 ° C Temperature of first heater 4 (H ₂ T) 160 ° C. Length of yarn contacting the pin heater 3 50 mm The hot pin of the pin heater 3 had a surface roughness of 2 to 3 s and a diameter of 60φ. The result of measuring the yarn temperature at a position 100 to 300 mm away from just below the pin heater 3 is shown in the graph of FIG. From this graph, in order to keep the yarn temperature at 80 ° C or below, the temperature of the pin heater 3 should be 150 mm when the temperature is 110 ° C.
It can be seen that the cooling length is required, and that when the temperature of the pin heater 3 is 130 ° C., the cooling length of 250 mm is required. Next, the cooling length is set to 250 mm, and the temperature (H ₁ T) of the pin heater 3 is set to 105 to 135.
The crimped yarn obtained by carrying out the above method while changing the temperature in the range of ° C is knitted into a tubular knit, and the result of the test of the feel thereof is
It shows in Table 1. From the results in Table 1, it can be seen that when the temperature (H ₁ T) of the pin heater 3 is lower than 110 ° C., the texture of the product is not bad, and when it exceeds 130 ° C., it is difficult to obtain a bulky product.

[0010]

[Table 1]

[0011]

Industrial Applicability According to the method of the present invention, it is possible to stably obtain a bulky yarn having fine curl crimps and having a very good feel.

[Brief description of drawings]

FIG. 1 is a process schematic view showing an example of a manufacturing process of a method of the present invention.

FIG. 2 is a graph showing the relationship between the cooling length after primary heat setting and the yarn temperature.

[Explanation of symbols] 1 supply yarn 2 feed roller 3 pin heater 4 first heater 5 spindle 6 delivery roller 7 second heater 8 feed roller 9 winding cheese

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification code Internal reference number FI Technical display location D02J 1/22 P 13/00 E

Claims (1)

[Claims] 1. Two kinds of drawn yarns having a difference in heat shrinkage of 15% or more and having an entanglement number of 20 to 50 yarns / m are twisted,
Primary heat setting, cooling, secondary heat setting, and untwisting treatment. Primary heat setting is performed using a pin heater with the following conditions. Surface roughness 2-3s Effective yarn length 30-90mm Temperature (H ₁ T) 110 to 130 ° C. and the temperature of the yarn is cooled below the glass transition point by cooling after the primary heat setting, and the subsequent secondary heat setting is 30 to 50 ° C. higher than the temperature of the primary heat setting. A method for producing a special bulky yarn, which is carried out at a temperature.