JPS63282331A - Special false twisted processed yarn - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention provides a texture and appearance similar to that of a simply drawn yarn (hereinafter referred to as "false-twisted yarn"), which is a false-twisted yarn but has not been subjected to the false-twisting process. The present invention relates to a bulky structured yarn mainly composed of polyester fibers, which has a "drawn yarn-like" state), and the structured yarn of the present invention is mainly used in the field of feminine silk-like clothing. It is something.

<Prior art and problems to be solved by the invention> As a method for producing bulky structured yarn, a method of plucking and false twisting a plurality of fiber yarns is known, and usually false twisting at 180 to 230°C It is common to pre-combust at a normal temperature and twist number. Using this method, different textures can be created depending on the yarns combined and the false twisting conditions, but almost all of them are linen-like textured yarns that utilize glue, and wool with large crimped bulk. It is a like textured yarn, has bulkiness, and resembles a drawn yarn, making it a good choice for detailed structured yarns.

Means for Solving Problems> The present inventors conducted research with the aim of obtaining a structured yarn that is like a drawn yarn and has bulkiness, and as a result, they arrived at the present invention. That is, the present invention provides a structured yarn in which one polyester fiber yarn serves as a core yarn and the other polyester fiber yarn serves as a side yarn and is wound around the core yarn, and has a crimp rate (LKs value) of 5. % or less, a fresh water shrinkage rate of 6% or more, a specific gravity of 1.3750 or less, and a silk-like bulky special false-twisted yarn characterized by having core yarns and side yarns intertwined. Here, Kl means 5000 for a certified winder.
After winding up the sample until it reaches a denier (d), hang a 10g load at the center of the lower end of the denier, fix it at the upper center, and apply a load of o, o o t yc. So 90
Hydrothermal treatment is carried out at ℃ for 30 minutes. Then, after drying by leaving at room temperature without any load, a load of 10 g was applied again and the yarn length after being left for 5 minutes was measured and designated as Ll (tm). Next, a load of 1 kg was applied and the yarn length was measured after being left for 30 seconds and determined as L2 (1 m). K is determined by the following equation.

K, (g) = ((L2-LH)/Lz) X 10
0 This value indicates the roughness of shrinkage due to the crimpability of the yarn, and the value obtained by multiplying a large load by the length when no crimp is applied (multiplying the length by a small load (also equivalent to no load)) This shows the difference in length when

Kl of ordinary bulky structured yarn (wool-like textured yarn)
The value is 7-20%. There are some structured yarns with less than 5%, but these are adhesive yarns or false-twisted two-stage heater high-heat treatment systems, and they are all obtained by high-heat treatment of one or two stages of false twisting, and the Kl value is low. Even if it is 5% or less, the seawater shrinkage rate and specific gravity as a result of high heat treatment are far outside the range defined by the present invention. When the K value exceeds 5%, the crimpability is high (it becomes like a textured yarn and does not become like a drawn yarn. More preferably, Kl<49).

In order to obtain the good texture of the unique silk spinning that is the object of the present invention, high heat treatment must not be performed in both the first and second stages, and low crimpability and post-processing heat treatment after weaving must be avoided. Therefore, it is important to have a relatively large shrinkage heat change different from that of general processed yarns, and for this purpose, it is necessary that the fresh water shrinkage rate be 6% or more and the specific gravity be 1.3750 or less. If the fresh water shrinkage rate is less than 6% or if the specific gravity exceeds 1.3750, the shrinkage after gray weaving will be small and the characteristic bulge texture will be difficult to obtain, both of which will result in a drawn yarn that is the object of the present invention. It is not possible to obtain textured yarns with a similar structure. More preferably, the fresh water shrinkage rate is 7% or more and the specific gravity is 1.370 or less.

Generally, when two yarns with different elongations are combined and false-twisted, the yarn with the lower elongation becomes the core yarn, and the yarn with the greater elongation becomes the side yarn and is twisted around the outer periphery. Excessive stretching of the yarn inevitably results in a difference in yarn length. If there is a difference in yarn length, it will be very difficult to handle unless entangling treatment is applied, and the core yarn and side yarns will become oily and fluffy, and the resulting fabric will have streaks of dyeing. Spots tend to occur frequently. It is desirable that the entanglement treatment be performed before false twisting or stretch false twisting; if it is applied after false twisting, fuzz tends to occur frequently. However, the generation of this fluff results in a texture that is closer to silk spinning than spun-like, so if a spun-like silk-like texture is extremely important, an entanglement treatment may be applied after false twisting. .

Next, a typical method for obtaining the false twisted yarn of the present invention will be described. First, a plurality of yarns, including two polyester fiber yarns with a difference in elongation at break of 50% or more, are twined and entangled, and then twisted at a low temperature in the range of 80 to 150°C. and the following formula % formula % Dr: Obtained by false twisting or drawing (simultaneous or continuous) false twisting at a low number of twists that satisfies the fineness (denier) of the yarn after drawing. When performing combined processing,
If the draw ratio is 1.5 or more, especially 2.0 or more, the entanglement points will be destroyed and the bundling property will deteriorate, so use high-speed spun undrawn yarn of about 25001 rLZ or more as the low elongation yarn to serve as the core yarn. This is desirable. However, when a drawn yarn is used as the core yarn, the physical properties of the drawn yarn already include a fresh water shrinkage rate of 8 to 10% and a specific gravity of nearly 1.380. As mentioned above, it is easy for the specific gravity to deviate from the range of 1.375 Q or less, but in such a case, use an appropriate side thread and average it with gold thread to bring it within the range specified in the present invention. A good fabric can also be obtained from such processed yarn. As is clear from this, the specific gravity referred to in the present invention is
This is the average value of the core yarn and side yarn, that is, the average value taking into account the quantity ratio.

The cotton-like, drawn yarn-like bulky structured textured yarn of the present invention has two yarns, one of which serves as a core yarn and the other as a side yarn, resulting in a two-layered yarn. Therefore, in order to bring out even more characteristics when fabrics are made from these yarns, it is desirable that the single fineness of these fiber bundles satisfies the following formula.

Dr(1)≧1.3 Dr(1): Thickness (denier) of the core yarn after drawing Dr(2J≦1.3) Dr(2): Thickness (denier) of the side thread after drawing L) r(1 )＞Dr(
2) That is, 1) By increasing rflll (core yarn), the stiffness of the woven or knitted fabric can be strengthened, and by decreasing (higher count) Dr12) C side yarn), the soft feel of the woven or knitted fabric can be increased. More preferably J)r(1)≧2.
0, Dr(2)≦1.0.

Further, in the present invention, the proportion of the yarn serving as the core yarn is preferably 30 to 70% by weight of the structured yarn.

The polyester fibers constituting the processed yarn of the present invention are fibers made of a polymer mainly composed of ethylene terephthalate units, and of course contain a small amount of other components for modification.
For example, isophthalic acid, sulfoisophthalic acid, etc.) may be copolymerized (or other polymers or additive components may be mixed).

Hereinafter, the present invention will be briefly explained with reference to Examples.

Example 1 Let A be a 50 denier, 24 filament drawn yarn (elongation 29.5%) made of polyethylene terephthalate bright polymer obtained by a conventional method.Next, a polyethylene terephthalate bright polymer also obtained by a conventional method 80 coiled at a speed of 3000 m/min.
A denier, 72 filament high speed spun undrawn yarn (elongation 125%) is designated as B.

After doubling these Δ and B yarns and performing an intertwining process of 70 entanglements/etc. at a pressure of 2.0 ky/d in advance using only the unwinding tension from the creel, the following False twisting was performed under certain conditions.

False twisting conditions Number of twists T/m overfeed 6.0% heat 95
The physical properties of the resulting processed system were as follows.

K1=t, t% Boiling water shrinkage rate=8.5% Specific gravity=1.
The yarn of No. 365 had a drawn yarn-like and cotton-like texture, and was extremely excellent as a raw yarn for feminine silk-like clothing.

Example 2 C is a high-speed spun raw yarn of 75 denier and 36 filaments (elongation 144%) that was wound at a spinning speed of 3200 m/min using a polyethylene terephthalate bright polymer treated in a conventional manner. An 85 denier, 48
A medium-speed spinning yarn of filament (elongation 230%) is designated as D.

Combine these C and D, use an interlace nozzle,
Entanglement I at overfeed rate 2% and air pressure 2.5kg/d! After performing the entanglement treatment at a rate of 55 pieces/m, simultaneous stretching and false twisting was performed under the following conditions.

False twisting conditions Stretching ratio 1.45 Heater pond 1)! 120℃ Number of twists: 2 to o T, 4 speeds
The physical properties of the processed yarn obtained at 200 threads/min were as follows.

K1=2.9% Boiling water shrinkage rate=8.5% Specific gravity=1
．． 3683 This processed yarn also resembled a drawn yarn and had an excellent cotton-like texture.

As a result of producing a warp-textured habutae woven fabric using the false-twisted processed yarns obtained in Examples 1 and 2 without twisting, a soft silk-like fabric with a bulkiness that is unexpected from a non-twisted fabric was obtained. Ta.

Claims (1)

[Claims] 1. A structured yarn in which one polyester fiber yarn serves as a core yarn and the other polyester fiber yarn serves as a side yarn and is wound around the core yarn, and has a crimp rate (K_1 value) is 5%
Below, boiling water shrinkage rate is 6% or more and specific gravity is 1.3750
A silk-like bulky special false-twisted yarn having the following properties and characterized in that the core yarn and the side yarn are intertwined. 2. Polyester single fiber fineness (Dr(1)
); unit: denier) is larger than the polyester single fiber fineness (Dr(2); unit: denier) constituting the side yarn,
The silk-like bulky special false twisted yarn according to claim 1, which satisfies the following formula. Dr(1)≧1.3, Dr(2)≦1.3