JPS6151464A - Cheese package of temporary twist crimped yarn - Google Patents

Abstract

PURPOSE:To prevent cloudiness from being produced even in knitting a fine denier temporary twist crimped yarn after undoing said yarn from a package thereof by respectively setting a biconical angle, density of winding, a ridge angle, and a wound length of a yarn from one end of the other end of cheese to a specific value. CONSTITUTION:In a biconical cheese package of a temporary twist crimped yarn of a synthetic fiber multi-filament yarn of 35 denier or less, a biconical angle beta is set to be 40 deg. or more, density of winding to 0.75g/cm<3> or more, a ridge angle alpha to be 6 deg. or less, and a wound length of a yarn from one end A to the other end B of cheese to be 2.5m or more. Hereupon, variations in tension of the yarn upon undoing it can relatively reduced, as well as cloudiness between yarns in adjoining courses is difficult to act in concert. Furthermore, production of cloudiness can be reduced also when undoing fine denier temporary twist crimped yarn from a biconical cheese package to knit it.

Description

Detailed Description of the Invention [Industrial Application Field] The present invention relates to a cheese package made of false twisted crimped yarn, and in particular, to a false twisted crimped synthetic fiber multifilament yarn of 35 denier or less used for pantyhose etc. This invention relates to a biconical cheese package for directly supplying processed yarn to a knitting machine.

[Prior art]

It is common practice to unwind the false twisted crimped yarn from the biconical cheese package and feed it directly to the knitting machine0. Conventional biconical cheese packages of the false twisted crimped yarn are
The winding density is O-"7'f/Cm' or less, the edge angle is 7° or more, and the yarn winding length from one end of the cheese to the other end is 2fn.
There was something that said the following. This is because high-edge angle winding and low-tension winding are considered preferable from the viewpoint of unwinding properties of bulky false-twisted crimped yarns and prevention of false-twisted crimped yarns from sagging. In fact, if the false twisted crimped yarn is 35 denier x thicker, bulkier yarn, the yarn unwound from a biconical cheese package with a low winding density and high ridge angle as described above is directly supplied to the knitting machine. Knitting can be carried out without any hindrance, and silk spots due to the crimped bed are less likely to appear on the knitted fabric.

However, when knitting is performed at a high speed of 400 yn/% or more using false twisted crimped yarn of 35 denier or less, such as pantyhose, low winding density and high ridge angle as described above are required. When fine denier false twisted crimped yarn unwound from a biconical cheese package is directly fed to a knitting machine for knitting, spots are likely to appear on the knitted fabric due to fluctuations in unwinding tension.

[Purpose of the invention]

The present invention has been made in order to solve the problem that knitted fabric unevenness tends to occur when fine denier false twisted crimped yarn is unwound from a biconical cheese package and knitted. In other words, the reason why unevenness is more likely to appear in the knitted fabric is that when unwinding from a cheese package with a low winding density and high ridge angle, in the case of fine denier false twisted crimped yarn, the average unwinding tension is low. The fluctuation of the unwinding tension becomes large, and
If the knitting yarn length for one round course is less than 1 m, but the yarn winding length from one end of the cheese package to the other end is 2 m or less, the winding of the yarn in the portions forming adjacent courses will be difficult. The present invention was made based on the findings that it was determined that this is largely due to the fact that shrinkage spots tend to synchronize and become noticeable as knitted fabric spots.

The present invention has a relatively small variation in unwinding tension, is less likely to cause crimp irregularities in adjacent courses, and can be supplied directly to a knitting machine to produce silk fabric irregularities. The present invention provides a cheese package made of twisted crimped yarn.

[Structure of the invention]

The present invention is a biconical cheese package made of false twisted crimped synthetic fiber multifilament yarn of 35 deniers or less, which has a biconical angle of 40 degrees or more and a winding density of 0, 75? /cm' or more, the edge angle is 6 degrees or less, and the yarn winding length from one end of the cheese to the other end is 2.5 m or more. The above objective has been achieved.

The winding density in the present invention is 0.75? /Cm' or more is 3
In the case of a thick false twisted crimped yarn of 5 denier, the winding density is 0.
,, Even if it is as low as 7 g/cm3 or less, the average value of the unwinding tension is quite high, so the relative tension fluctuation is small, and the tension fluctuation per denier is small, so the fluctuation of the unwinding tension is However, in the case of fine denier false-twisted crimped yarns of 35 deniers or less, the average value of the unwinding tension is low and the relative tension fluctuations are large.
As a result, crimp spots are likely to appear, so by increasing the winding density, the crimp force during unwinding is strengthened, thereby reducing relative tension fluctuations and making it easier for the crimp yarn to separate from the cheese layer. It is something. Winding density is 0.75y
When it is lower than /cmS, both the relative unwinding tension variation and the tension variation per denier become large, and crimp spots tend to appear.

In addition, in the present invention, when the edge angle is 6° or less, the winding length of the yarn from one end of the cheese package to the other end is 2°5 m or more, and some crimp spots may appear due to fluctuations in unwinding tension. Even if there is, the crimp spots are prevented from being synchronized in the formed portions of adjacent courses of the knitted fabric and standing out as knitted fabric spots.

When the edge angle is larger than C, it becomes difficult to maintain the winding length at 2.5 m or more, and even if the winding tension is increased and the winding hardness of the cheese package is increased, the winding length will not be 0.0 m. 75r
It becomes difficult to obtain a winding density of /Cm' or more, which makes it easier for the outside air to penetrate into the inside, promoting stress relaxation in the yarn, and therefore reducing crimp force during calculation, making it relatively difficult to solve the problem. The fluctuation in the sheathing tension increases, making it easier for crimp spots to appear.

That is, it is already known from Japanese Patent Publication No. 53-11572 that the winding tension of the cheese package is increased to increase the winding hardness of the cheese package, thereby increasing the crimp force of the false-twisted crimped yarn. However, even if this method is adopted for winding cheese packages with an edge angle of 7° or more, the present invention increases the crimp force during unwinding and prevents the occurrence of crimp spots due to fluctuations in unwinding tension. It is difficult to achieve this goal. In order to increase the crimp force during unwinding, it is necessary to increase the winding density, and of course it is necessary to increase the winding tension to increase the winding density, but it is necessary to increase the winding tension. It is necessary to reduce the edge angle.

If the ridge angle is made small, such as 60 or less, a fatal problem is likely to occur in which the twill falls off during unwinding and the thread is likely to get caught at the cheese end. Therefore, in the present invention, the biconical angle is 4.
This problem has been solved as a biconical cheese package with a temperature of 0° or higher.

The figure is a side view showing the rolled shape of the cheese package of the present invention, in which α shows a ridge angle of 6° or less, and β shows a biconical angle of 400 or more. Then, the yarn winding length υ from A to B4 is 2.5 m in any winding layer.
That's all there is to it.

〔Example〕

Next, specific examples of the present invention will be shown.

A 15-denier 15-filament polyamide yarn is false-twisted using a friction disk false-twisting means, and the resulting false-twisted crimped yarn has a traverse cam width of 2Qcm, and a rubber guide with an oscillating mechanism that starts from an initial stroke length of 25cm. It was wound into a cheese package with a biconical angle of 50 degrees using a biconical cheese winder that changes the traverse width up to a final stroke length of 15 cm.

In this case, the winding speed of the false twisted crimped yarn is 700,771/min,
The feeding speed of the polyamide yarn was kept constant at 3.8% overfeed, and the traverse speed was varied to obtain biconical cheese packages under each condition.

Each of the obtained biconical cheese packages was used in a KTS-4 type knitting machine manufactured by Mizuta Seiki Co., Ltd. to knit pantyhose at a knitting speed of 90OrpmO (unwinding speed of false twisted crimped yarn 600 to 900 m7 minutes). .

Table 1 summarizes the results of visual evaluation of the traverse speed, various properties of the obtained cheese package, and the surface of the knitted fabric (knitted fabric irregularities) in the above process.

〔Effect of the invention〕

As is clear from Table 1, the winding density is 0-759/cm'
As described above, according to the false twisted crimped yarn cheese package of the present invention in which the edge angle is 6° or less, the yarn winding length from one end of the cheese to the other end is 2.5yyz or more, and the biconical angle is 40' or more, the eye surface pantyhose of good quality can be knitted without any problems.

It goes without saying that the cheese package of the present invention can be used not only for knitting pantyhose but also for other purposes.

[Brief explanation of the drawing]

The figure is a side view showing the rolled shape of the cheese package of the present invention. α...edge angle, β...biconical angle.

Claims (1)

[Claims] A biconical cheese package made of false twisted and crimped synthetic fiber multifilament yarn of 35 denier or less, with a biconical angle of 40° or more and a winding density of 0.75 g.
/cm^3 or more, the edge angle is 6° or less, and the yarn winding length from one end of the cheese to the other end is 2.5 m or more.