JPS5818411A - Polyester thick and thin yarn - Google Patents

Abstract

PURPOSE:The titled thick and thin yarn that has a structure in which two thick parts of a certain length are arranged side by side and the fiber fineness and optical birefringence of the thick parts are made a specific times those of the thin parts and the thick and thin parts are repeated in a certain cycle, thus giving natural uneveness of warm touch by dyeing and finishing. CONSTITUTION:When an undrawn polyester yarn 1 is passed around the goddet roller 2, drawn between the feed roller 3 and the draw roller 5 and wound up into a pirn 6, a projection 4 is formed on the surface of the feed roller 3 to produce the objective thick and thin yarn that has a basic structure unit in which two thick parts of less than 5cm length are arranged side by side and the fineness of the thick parts is 1.1-1.8 times that of the thin parts, their optical birefringence is more than 0.045 and 0.3-0.8 times that of the thin parts and the basic units are repeated in a constant cycle of 0.1-1.0m.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to Melieste μma N Chifuifumeshi F, which has uneven thickness in the outermost direction. To provide a polyester μ yarn that can be given a tasteful "natural mottling".

Traditionally, so-called mottled threads, which are made by varying the fineness, degree of buttoning, crystallinity, etc. in the length direction of the fibers, have been developed due to differences in dyeing ability, differences in fusion temperature, and chemical treatment that occur in the length direction of the fibers. It is used in a wide range of fields by taking advantage of the differences in its effects, and is valuable as a special material that has unique effects that are difficult to obtain with ordinary synthetic fiber filaments, such as improving the crispness due to partial fusion.9 It has become an existence.

In order to meet the demands from various fields, various types of spot-shaped vipers have been proposed, and many manufacturing methods have also been proposed.

Most of these mottled threads are intended to enhance the effect by emphasizing the difference in performance of the nine mottled parts.For example, when aiming for the true east effect, the dyeing ability of the easy dyeing part is The larger the difference is compared to the normal part, the more effective it is, and the larger the difference in fusion temperature between the two, the more effectively the spots can be utilized.

On the other hand, natural fibers such as silk thread have minute spots,
It is known that these spots are important for creating natural warm luster and depth of color in woven and knitted products9.
Such ``natural specks'' are increasingly being required for the speckled threads of synthetic iron heels.

In response to such market demands, the present invention provides a useful polyester omentum yarn that can be produced industrially easily and stably and exhibits natural IEJ.

That is, in the present invention, the fineness of the fine skin part is 1.1 times or more.
A large material having a fineness of 8 times or less, a birefringence greater than 0.045, and 0.5 times or more and 0.8 times or less than the birefringence of the fine skin part, and a length shorter than 5eIl. The basic unit is a structure in which two fineness parts are connected, and the basic unit is 0.1 so-called 1 on the board.
．． This polyester ρ thick and thin yarn is characterized by having a basic structure that is repeatedly arranged at a constant period of 011 or less.

In the present invention, the birefringence index of the large fineness portion is set to be 0.045 or more and the ratio of the birefringence index to that of the fine skin portion is specified.

When the practical performance of the yarn is emphasized and one part of the spots is emphasized, the spots are too emphasized, which is not preferable for the purpose of the present invention. Moreover, if it is larger than 0.8 times, the difference between the two is too small to be perceived as a spot.

The same is true for the ratio of the fineness of the thick skin part and the fine skin part; if the fineness ratio is too large, spots are likely to be emphasized, and if it is too small, no effect will be seen at all.

Therefore, the fineness ratio is preferably between 1.1 and 1.8.

Periodically arranging basic units consisting of two large fineness parts of 51 Sakashita is easy to produce industrially at low cost and stably.
This is necessary to counteract the negative effects of the periodicity of mildew spots. In order to further actively reduce the periodicity of the spots, it is also possible to include approximately 1 to 5 large fineness portions other than the basic units in the period. The length of the thick part used as the basic unit was determined to be 5a1 or less IC@.
If the length is longer than I, the proportion of poorly oriented portions increases as a whole, which causes negative effects on the manufacturing process such as occurrence of yarn breakage rate 2 fluff, and also causes undesirable unevenness on the product.

In addition, if the period of arranging the basic units is less than 0.1, it is not preferable because a series of low-oriented parts with high fineness will result, and the practical properties such as strength and elongation of the yarn will be significantly reduced. When the temperature exceeds 0 M, the periodicity of the spots becomes noticeable and a "mechanical coldness" appears, making it difficult to obtain the "natural warm taste" which is the object of the present invention.

Therefore, the length of 9 cycles is preferably 0.1 xi or more and 1.011 or less.1According to the experience of the present inventors, 0.1511
More preferably 1 or more and 0.5 m or less, especially when the yarn is composed of only the basic unit period, 0.151
It is more desirable to set the period to 1 or more o and s swm or less.

As a method for obtaining the yarn of the present invention, for example, when drawing the spun-seeded polyester μ Mikaze yarn at a rate of 5,200 resolution/min or more, manufacturing is performed by applying the apparatus shown in *Kj1 No. 56-53781 KjII. can do. FIG. 1 shows an example of an apparatus for manufacturing the yarn of the present invention, in which an undrawn yarn 1 passes through a godet roller 2, is stretched between a supply lobe 3 and a take-up row 5, and is wound onto a pirn 6. At that time, a protrusion 4 is provided on the surface of the supply roller 30 so that at least the last wound yarn on the supply loaf can be removed by the protrusion 4.
By setting it so that it is located at the top, it is possible to produce a patch that is a basic unit consisting of two successive parts of large fineness that are hardly affected by dust.

By adjusting the diameter of the supply roller, the number of protrusions, the number of times of contact with the yarn, the circumference of the supply loaf, and the stretching ratio, it is possible to produce speckled yarn with any period. Furthermore, the length of the large fineness portion can be adjusted by adjusting the material, shape, temperature, etc. of the protruding body. Further, by changing the temperature of the supplied loaf, the degree of orientation of the supplied undrawn yarn, the stretching ratio, etc., it is also possible to mix large fineness parts other than periodic irregularities.

In addition, methods to check the condition of spotting include a method of knitting and dyeing the yarn and visually determining it, and a method of measuring using a star yarn spotting tester made by Keisokuki Kogyo ■ under the following conditions. I can do it.

-) Number of large fineness spots and period length double Conditions shown in Table 1 (1
) (Count the number of peaks that touch the large fineness side by 4g6 or more from the measured yarn chart.

佽) Length of the thick part: Measured under the conditions ω) shown in Table 1 to obtain a chart as shown in Figure 2 (4), and Figure 2 (A)
/) After converting X is into yarn length (Xoa+), the value obtained by correcting the slit length (Sl) of the yarn unevenness measuring section is shown.

i.e. The length of the thick part = Xo - S (m).

In addition, if the peaks overlap in the chart, see Ql in Figure 2.
Find Xs and Xm by performing the following operations.

From this, calculate the sadness of the thick part.

With this invention? ! Ester fiber means a fiber obtained by melt spinning from polyester P containing 857 μ% or more of Ethylene Tele 7 Talley F component as a repeating unit, and generally contains small amounts of known copolymer components, additives, etc. It may include.

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

Example 1 Spinning speed 5500/! of 110 denier/36 filament made of ethylene terephthalate with intrinsic viscosity [η)=0.65] The undrawn yarn obtained by spinning with ll1n was drawn under the following conditions using a drawing/twisting machine equipped with a supply roller equipped with one protrusion shown in FIG.

Radius of supply roller: 501 Shape of protrusion: height 2 rin 9 curvature radius 6 m at the final winding part
The surface temperature of the feeding loaf equipped with the protruding steel material is 70℃.The stretching ratio is 1.25. It was a multifilament composed of threads as shown in Fig. 3, the basic unit of which is repeated at a period of about 0.41 seconds.

The birefringence and fineness of the thick part and fine skin part of this yarn are 92
It looked like a table.

Table 2 This yarn was made into a tubular knitted fabric of rlIi751, dyed under the following conditions, and the WE development line and its buffiness were visually judged. It was a preferable yarn with a moderate level of appearance, and it was a large fine thread with stable spots with no buffiness observed even in the spots of 100 paan that were removed from the fundum.

[Staining conditions]

After immersion in a 50C dye bath, the temperature was raised to the boiling point for 30 minutes, and flash dyeing was carried out at that temperature for 30 minutes.

Dye I4: Resolymp*-GRL 2glIowf
Bath ratio: 1:50 Example 2 Polyethylene terephthalate having an intrinsic viscosity [η] of −0.65 was wound at various spinning speeds to obtain undrawn yarns having birefringences of Il. This undrawn yarn was subjected to basket stretching using the same drawing and twisting machine as used in Example 1, changing the number of protrusions on the supply roller and the temperature of the supply roller as appropriate, to obtain an 85 denier ρ/36 fiber F yarn. Obtained omentum thread.

As these yarn wefts, 75 denies/I without thick or thin
// Drive alternately with 36 filament thread.

After producing a plain woven fabric and finishing with dyeing, the quality of the woven fabric was visually judged. The results are shown in Table 3.

[Brief explanation of the drawing]

111! Figure 1 is a schematic diagram of a paper twisting machine which is an example of a device for producing large fine yarn of the present invention, Figure 2 is an explanatory diagram of a method for measuring the length of a large fineness portion from a chart. FIG. 1 is a model diagram of a large fine thread of the present invention obtained in a project example. 1. Undrawn yarn B supply loaf 4. Protruding body 5. Takeover Low Two Patent Applicant Yuzo Kodama, Agent of Nippon Ester Co., Ltd.

Claims (1)

[Claims] 1. The fineness is 1.1 times or more and 1.8 times or less the fineness of the fineness portion, and the birefringence is greater than 0.045. And the birefringence index of the fine fineness part is 0.3 times or more and 0.8 times or less, and the basic unit is a structure in which two large fineness parts with a length shorter than 5121 are connected, and the basic unit is 0.1111 or more. 1.
1. A large fine yarn characterized by having a basic structure that is repeatedly arranged at a constant period.