JPS6356151B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for continuously winding a filament yarn into a pirn after false twisting, and more specifically, a method for winding a low-strength curly yarn having a strong residual torque after false twisting into a pirn. , relates to a method for winding up a pirn for smooth unwinding.

In addition, in the present invention, the term "yarn having residual torque after false twisting" refers to a torque yarn obtained by false-twisting a thermoplastic synthetic fiber yarn and generally having an inherent torque in the same direction as the twisting direction during false twisting. .

Conventionally, when winding curled yarn with false twisting torque onto a pirn, the unwinding resistance from the pirn is extremely reduced to minimize tension fluctuations and create smooth winding in order to prevent problems such as poor yarn standing during the knitting and weaving process. It is wound to make it stringy. In other words, a winding method has been used in which the torque of the curled yarn acts in a direction that causes the curled yarn to roll toward the lower side of the pirn.

However, low-density curled yarns with strong false-twisting residual torque have poor bulk and high cohesiveness, resulting in low yarn-to-yarn frictional resistance, making the yarn standing too smooth and unraveling from the pirn. During this process, many strong cracks occur, which is a major problem in knitting and weaving processes. For this reason, although anti-tangle devices are used during unwinding, they are not sufficient and cause a decline in operability.

On the other hand, other known examples include JP-A-49-
As proposed in Japanese Patent No. 50254, it is known to wind in the same direction as the false twisting direction during false twisting. However, although this method is considered to have a remarkable effect in the case of polyamide filament yarns that are ordinary false twisted yarns (highly twisted yarns), This method is not yet satisfactory in the case of yarns with low false twist (low curly yarn). In other words, low-false-twisted polyester filament yarns have strong torque, so if they are wound in the same direction as the false-twisting direction, the torque decreases, and the unwinding at the lower taper of the pirn progresses too much, causing loops to fall out. Or, due to strong torque, natural unraveling occurs and the thread becomes tangled.

The purpose of the present invention is to provide a pirn winding method that improves the operability in the post-process by improving the above-mentioned drawbacks, and the purpose of the present invention is to provide a pirn winding method that improves the operability in the post-process. This objective can be achieved by defining the relationship with the pirn winding direction.

In other words, the present invention provides, "When winding a filament yarn made of polyester synthetic fiber into a pirn after false twisting, the number of false twists (T/m) during false twisting is 15000/√ or less,
And the torque twist number (T/m) of the false twisted yarn is 100.
The pirn winding method is characterized in that the pirn is wound while being twisted in the opposite direction to the temporary twisting direction. (However, D: denier).

That is, as shown in FIG.
This is a method of winding a low-density curled yarn 1 of polyester filament false-twisted at 15,000/√ or less into a pirn while twisting it counterclockwise, that is, in the Z direction when viewed from the bottom of the pirn 2, which is different from the conventional technology. is a totally symmetrical pirn winding method.

To explain the method of the present invention in more detail,
First, the yarn to be used is a filament yarn made of polyester synthetic fiber, and a multifilament yarn is more suitable than a monofilament yarn, and one with a large number of filaments is more suitable than one with a small number of filaments. In the false twisting process, the false twisting twist number is extremely low, less than half of the normally known range, and specifically in the range of 15000/√ or less (D is the denier number). ), the torque twist number (T/m) of the false-twisted residual torque yarn is 100 or more. Note that the torque twist number as used in the present invention refers to the number of torque twists obtained by suspending a small load of 0.38 g at the center of a 1 m sample length sampled under a constant load of 0.1 g per denier and bringing both ends of the sample length together. This refers to the number of twists that the load rotates and inserts. As the false-twisting twist number increases beyond this range and approaches the commonly known range, the false-twisting residual torque generally decreases, so the bulkiness and apparent diameter of the yarn gradually increase, which increases the risk of twisting. This becomes less likely to occur, and as mentioned above, the frictional resistance when unwinding the yarn from the pirn increases, which worsens the yarn standability, making it necessary to take the conventional improvement measures mentioned above. It is.

In contrast, in the present invention, when winding into a pirn a low-strength curled yarn that has been false-twisted in a range with a strong false-twisting residual torque that cannot be applied with the prior art, that is, the false-twisted twist number is 15000/√ or less, As shown in Fig. 1, in the case of curled yarn 1 which has false twist residual torque in the S direction, the pirn 2 is twisted by rotating the pirn counterclockwise when viewed from the bottom of the pirn, that is, twisting in the Z direction. Or, conversely, if there is false twist residual torque in the Z direction, pirn winding is performed while twisting in the S direction.

In the present invention, the false twisting method is not particularly limited, but the twisting method in which the traveling yarn is wound around a fixed pin and made to run while being tied one or more times can easily and stably perform false twisting with a super soft twist number. It is most desirable to employ this twisting method because it is optimal for obtaining a curled yarn having a strong false twist residual torque.

According to the method of the present invention, by winding the pirn in a direction completely opposite to that of the prior art, the curled yarn is additionally wound in the over-unraveling direction, so that the yarn swells. As a result, the yarn is wound around the pirn with a force that tends to stick to the yarn layer on the upper side of the pirn.
When unraveling, the bulge of the yarn and the force of its close contact increase the frictional resistance, thereby preventing the occurrence of fraying caused by strong false-twisting residual torque. Therefore, a low-strength yarn made of polyester filaments having a strong residual torque after false twisting can achieve smooth yarn standability without causing any chattering, especially when unraveling from a pirn.

Next, specific effects of the present invention will be explained using examples.

Example 1 Twisted false-twisting process in which a polyester filament yarn of 30 denier and 12 filaments is tied once to a fixed pin and run at a false twist rate of 2100 T/m (S addition), a setting temperature of 220°C, and a processing speed of 700 m/min. was carried out. The torque twist number of the obtained false twisted yarn was 132 (T/m). Note that the number of false twists is within the range of the present invention, that is, 15000/√30=2739 (T/
m) The following were satisfied.

Subsequently, the obtained false twisted yarn was wound into a pirn using a pirn winding machine while applying a twist of 10 T/m in the counterclockwise direction, that is, in the Z direction when viewed from the lower side of the pirn, as shown in FIG. Then, we unraveled the pirn intermittently 10 times at a speed of 88 m/min and measured the number and length of fraying, but no fraying occurred within the unraveling length of 40 cm, indicating smooth yarn standing. It was hot. Furthermore, there was no significant change in the number of torque twists of the unwound yarn.

Comparative Example 1 False twisting was performed in the same manner as in Example 1, and then twisting was performed in the clockwise direction, that is, in the S direction, as in the prior art.
As a result of winding the pirn while applying 10 T/m and measuring the number and length of burrs under the same conditions, it was found that 2 to 3 cm of burrs were constantly formed between 40 cm of the unwound length.
Three cracks were observed, which caused trouble in thread standing.
In addition, the torque twist number after unwinding decreased to 112 (T/m).

Example 2 Under the false twisting processing conditions of Example 1, the number of false twists was
It was carried out at 2650 (T/m). The torque twist number of the obtained false twisted yarn was 125 (T/m). This false twisted yarn was wound up into a pirn in the same manner as in Example 1, and an unwinding test was performed, and the yarn stood up smoothly without any problems. Moreover, no significant change was observed in the number of torque twists of the yarn after unwinding.

Comparative Example 2 Under the false twisting processing conditions of Example 1, the number of false twists was
An unwinding test was conducted using the same conditions except for the setting of 2850 (T/m), but slight cracking was observed at the upper taper of the pirt within 40 cm of the unwinding length.
The unwinding property was not good. The torque twist number was 93 (T/m) after false twisting.

[Brief explanation of the drawing]

FIG. 1 illustrates a pirn winding state according to an embodiment of the present invention, and shows a state in which yarn 1 obtained by false twisting in the S direction is wound onto a pirn 2 while twisting in the Z direction. It is something that

Claims (1)

[Claims] 1. When winding a filament yarn made of polyester synthetic fiber into a pirn after false twisting, the number of false twists (T/m) during false twisting is 15000/√ or less, and Torque twist number (T/m) of processed yarn
100 or more, and a pirn winding method (D: denier) characterized by winding into a pirn while twisting in the opposite direction to the temporary twisting direction. 2. A pirn winding method according to claim 1, characterized in that the false twisting process is carried out by a twisting method in which the yarn is tied to a fixing pin one or more times and run.