JPH0280634A - Conjugate nap yarn - Google Patents

Abstract

PURPOSE:To obtain a spun-like conjugate nap having a large number of entanglements and naps existing on the circumference of the conjugate yarn, high bulkiness, warm feeling, high strength and stable quality by interlocking undrawn polyester yarn having a specific breakage strength with drawn yarn of the above polyester yarn. CONSTITUTION:An undrawn polyester yarn 1 having a breaking strength of 1-3g/d is overfed between a feed roller 3 and a 1st delivery roller 5, heat-treated with a heater 4 in relaxed state and interlocked with a drawn polyester yarn 2 having a breaking strength of >=4g/d and supplied by the 1st delivery roller 5 using a fluid nozzle 6 simultaneous to the nap-raising treatment. The interlocked yarn is transferred through a 2nd delivery roller 7 and wound in the form of a package 9 by a winder roller 8 to obtain the objective conjugate nap yarn having >=40 interlocked parts per 1 meter and >=100 naps having a length of >=1mm on the circumference of the conjugate yarn per 1 meter of the yarn.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention relates to a spunlike composite yarn with fluff obtained using polyester filament yarn.

(Prior Art) In general, filament yarns are easy to make fine and have uniform and silky characteristics, but on the other hand, they have the disadvantage of not being able to express the fullness and warmth of spun yarns, such as the warmth to the touch.

These differences are thought to be mainly due to differences in the structure of the threads. Spun yarn differs from filament yarn in terms of fluff, disordered fiber arrangement, uneven self-twisting, and real-twist structure, and the most notable difference is that it has fluff. Therefore, as a method of imparting fuzz to the filament yarn, there are methods such as cutting the filament using a grindstone roller or cloth, or forcibly cutting the fuzz, for example, Japanese Patent Publications No. 51-46180, No. 60-22091, No. 61- No. 14258 and the like.

(Problem to be solved by the invention) However, these conventional techniques not only require special equipment and difficult process control, but also have unstable thread quality due to a decrease in strength due to the principle. However, there were still problems in practical terms.

The present invention aims to eliminate these drawbacks and provide a spun-like composite fluffy yarn that has sufficient strength and is stable in quality.

(Means for Solving the Problem) Therefore, the present invention provides an intertwined composite yarn of undrawn polyester yarn having a breaking strength of 1 to 3 g/d and the same drawn yarn having a breaking strength of 4 g/d or more. and the number of interlaced parts is at least 4.
The present invention provides a means for solving the above-mentioned problems by providing a structure in which the number of fluffs is 0 pieces/m or more, and 100 pieces/m or more of fluffs having a length of 1 m or more are present on the circumferential surface of the composite yarn.

(Function) Hereinafter, the present invention will be explained in detail along with the function based on the drawings. FIG. 1 shows a schematic configuration of an apparatus used to obtain the fluffy yarn of the present invention, and FIG. 2 is an external view of the composite fluffy yarn obtained.

The undrawn polyester yarn 1 is subjected to appropriate overfeed between the feed roller 3 and the first delivery roller 5 for relaxation treatment, and then subjected to relaxation heat treatment by the heater 4. On the other hand, the polyester drawn yarn 2 is supplied from the first delivery roller 5, and after receiving an appropriate overfeed between the two and the second delivery roller 7, the polyester drawn yarn 2 is combined, cut into feathers by the fluid entangling nozzle 6, and entangled at the same time. be done. Then,
It is wound up as a pan cage 9 by a wind roller 8.

The present invention takes advantage of the fact that when undrawn polyester yarn is subjected to heat relaxation treatment, its structure becomes unstable and its strength decreases, and this fact is utilized. As a result of extensive research, we found that the breaking strength of filament threads that can easily be fluffed by fluid jetting is 3 g.
It was found that it was within the range of /d, preferably around 2g/d. If this breaking strength is 1 g/d or less,
The fluff is cut and falls off in the subsequent process, so the effect of the fluff yarn is not recognized, and the strength as a composite yarn cannot be sufficiently increased, which is not preferable. Here, the desired yarn design can be easily obtained by thermal relaxation as shown in FIG.

Figure 3 shows a polyester undrawn yarn (POY) 120 d/36 r obtained at a spinning speed of 3.200 m/min, passed through the apparatus shown in Figure 1 alone, and pulled with a single yarn that is not an interlaced composite yarn. This is a graph of the strength dependence due to changes in thermal relaxation rate when The processing conditions at this time are heater temperature 2
The temperature was 00°C, the heater length was 90C11, and the processing speed was Loom/min.

Although the yarn strength tends to decrease as the thermal relaxation temperature increases, there is no large change as seen in the relaxation rate. However, if the thermal relaxation temperature is 220° C. or higher, the texture becomes hard and even fusion occurs.

Further, if the temperature is 160° C. or lower, the setting effect will not be sufficient and residual heat shrinkage will increase in subsequent steps, which is not preferable.

Therefore, the thermal relaxation temperature is preferably in the range of 160°C to 220°C.

Next, the yarn obtained in this manner has low strength and high elongation and cannot be put to practical use.

Therefore, this is mixed and entangled with polyester drawn yarn, which has no practical problems as a reinforcing yarn, using a fluid nozzle to obtain a composite fluffy yarn. The fluid nozzle can be either a taslan type or an interlaced type, but in the case of the taslan type, the interlaced type is preferable because the ratio of the cut fluffs being looped is high.

In addition, the number of entangled parts is 40/I considering the bundling property of the composite yarn.
I+ or higher is required. The larger the number of intertwined parts, the fewer loose fuzz and the better the passability in the subsequent process.

The frequency of occurrence of fuzz depends on the injection pressure and flow rate of the fluid nozzle, but it mainly depends on the breaking strength of the yarn. Therefore, although the selection can be made appropriately depending on the thermal relaxation conditions, in order to recognize clear differentiation in texture and appearance effects, it is necessary to have fluff of 1 u or more in length and 100 lint/m or more.

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

Polyester undrawn yarn (POY) 120 d/36 f obtained at a spinning speed of 3.200 m/min was used as the cut and feathered yarn, and 75 d of ordinary polyester drawn yarn was used as the reinforcing yarn.
When the present invention was carried out using /36 f under the following conditions, a composite fluff yarn as shown in the schematic external view shown in FIG. 2 was obtained. When the obtained yarn was observed under a microscope, it was found that the intertwined part 1
1 was present at 84 pieces/1 mm, and the fluffs 10 appeared randomly before and after the intertwined portions 11. In addition, when the frequency of occurrence of fuzz 10 was measured using a method based on Shikishimabo F-index, the average length was 211, and the maximum length was l1.
m, the number of fuzz of 1f1 or more is 263 zero/II,
This satisfied the conditions of the present invention.

Recorded temperature: 180°C L list "1!"i: Length - 7': 1% Air pressure: 4 kg/aJ (Effects of the invention) As explained above in detail, the present invention is constructed, and is composed of filament composites. The composite fluff yarn can be easily obtained by using a chemical conversion technique, and the resulting composite fluff yarn is a spunlike yarn having stable fluff with sufficient strength and quality.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of the entire apparatus used to obtain the composite fluff yarn of the present invention, FIG. 2 is an external view of the composite fluff yarn showing an example of the present invention, and FIG. 3 is a diagram showing the strength improvement due to thermal relaxation. It is a graph showing dependence. Explanation of main parts of the figures 1 - Undrawn polyester yarn 2 - Drawn polyester yarn 3 - First feed roller 4 - Heater 5 - First delivery roller 6 - Fluid nozzle 7・-・Second delivery roller 10-Fuzz 11-・-Intertwined part

Claims (1)

[Claims] An interlaced composite yarn of an undrawn polyester yarn having a breaking strength of 1 to 3 g/d and the same drawn yarn having a breaking strength of 4 g/d or more, the number of intertwined parts being at least 40/m or more,
And there are 100 pieces/m of fuzz with a length of 1 mm or more on the circumferential surface of the composite yarn.
A composite fluffy yarn characterized by the presence of the above.