JPH0616937Y2 - Thread - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial field of application> The present invention relates to an improvement of a thread of a yarn guard used in a loom for weaving a fabric having a complicated pattern.

<Prior Art> Jiaguard is a type of loom because it gives complicated patterns to the fabric.
It is a device for moving one heald up and down, and the jail guard and the heald are connected by a thread. The thread to be sewn is selected so that the movement set by the jacquard can be accurately transmitted to the heald, the loom is not stopped due to a trouble during weaving, and the quality of the woven fabric is good. Such a thread must have the following properties.

(a): High modulus: Little elongation when force is applied.

(b) Low creep: Elongation does not occur. In particular, it is required to be less susceptible to environmental changes (temperature, humidity).

(c) Antistatic property: The phenomenon in which dust adheres to the running thread is less likely to occur due to charging by the mattresses of the running thread.

(d) Durability: Strong against bending fatigue.

(e) Handleability: Easy to tie. The knot is hard to pull out.

(f) Economical efficiency: The characteristics of conventional thread are as follows.

(A) Threaded yarn made of vinylon spun yarn: excellent in modulus, antistatic property, durability, handleability, and economical efficiency, but poor in creep property (large elongation under high humidity).

(B) Thread made of polyester spun yarn: Module,
It has excellent creep properties, durability, and economy, but has poor antistatic properties.

(C) Threaded yarn composed of polyester filament yarn: Antistatic property and handling property are poor, and cannot be used.

It has also been attempted to use a continuous yarn in which conductive fibers such as carbon fibers are mixed-spun or twisted with polyester spun yarn to impart antistatic properties, but the conductive fiber has low durability and is expensive, so it is practical. It has not been realized.

<Problems to be Solved by the Invention> The present invention has been found to have high modularity, low creep, and high durability as a result of intensive studies to create a thread having the various performances required for the thread as described above. , Less charged,
We succeeded in obtaining an ideal thread that is easy to handle and highly economical.

<Means for Solving the Problems> The present invention provides a means for solving the problems of the above-described thread made of vinylon spun yarn, thread made of polyester spun yarn, and thread made of conductive fibers in combination. It is characterized by using a so-called core yarn in which a polyester fiber is used as a component for imparting high modulus, low creep, and high durability performance to the core fiber bundle, and a sheath made of vinylon short fibers is formed around the polyester fiber. .

The core yarn referred to here is a core yarn having the above-mentioned constitution, in which the single fiber constituting the sheath covers the core fiber bundle without being substantially twisted with the other single fiber constituting the sheath, and is represented by the following formula: Which satisfies the covering rate (%) and the sheath fiber volume ratio is 30 to 80%.

Coverage (%) ≧ volume ratio of sheath fiber in core yarn (%) × 1.2 The polyester core fiber bundle constituting the core yarn has a spun yarn form (spun at the same time as the sheath fiber during spinning of the core yarn. However, multifilament yarns are more preferable in terms of high modulus, low creep and high durability. A preferred form of the polyester multifilament that constitutes the core fiber bundle is a single fiber denier of 0.5 to 50d and a total denier of 30 to 1000d in consideration of the entanglement with the sheath fiber, but a single fiber denier of 1.0 to 3.0.
d, total denier of 50 to 500 d is more preferable.

The vinylon short fibers constituting the sheath of the core yarn have an average fiber length of 38 mm to 51 used for ordinary cotton spinning or suf spinning.
It is also possible to use mm, but when the average fiber length becomes 70 mm, it becomes difficult for the sheath fiber to come off from the core fiber bundle of the core yarn,
It is more preferable because the process passability in the post-processing process such as the compounding yarn, the twisting yarn, and the rewinding is greatly improved. If the average fiber length of the vinylon short fibers constituting the sheath is 300 mm or more, the yarn cannot be practically passed through the spinning process, and the core yarn cannot be produced. Therefore, the preferable average fiber length of the sheath fiber is 70 mm.
~ 300 mm. Vinylon short fibers having such an average fiber length can be produced by using tow spinning (a parlock system, a converter system).

The vinylon short fibers constituting the sheath are selected from the range of single fiber denier 0.3 to 3.0 dr in consideration of the required performance as the above-mentioned thread, the coverage, the ease of making the sliver, and the degree of entanglement with the core fiber bundle. However, those of 0.5 to 2 dr are more preferable.

From the viewpoints of antistatic property and handleability, the threaded yarn according to the present invention needs to be composed of at least a core yarn having a coverage of 40% or more. Therefore, the volume ratio (%) of vinylon sheath fiber in the core yarn is Must be at least 30%. In addition, the thread used for high-speed spinning fiber is required to have high antistatic property, and the volume ratio of vinylon sheath fiber is
40% or more is more preferable.

Further, when the volume ratio of the sheath fiber is 80% or more, the ratio of the polyester fiber constituting the core fiber becomes small, and the low scooping property cannot be obtained. More preferably, the volume ratio is 70% or less.

In the core yarn used in the present invention, it is necessary that the monofilament constituting the sheath is not substantially twisted with the other monofilament constituting the sheath. When the core fibers are integrated into a yarn and the sheath fibers are used alone as a yarn, peeling from the core fibers is likely to occur, and the surface area occupied by the sheath fibers is reduced, reducing the antistatic performance. It will be.

Next, the present invention will be described with reference to the drawings.

Figure 1 shows the core yarn (coverage ≈ 100
%) 1 is a schematic representation of a cross section, 2 is a polyester fiber monofilament constituting a core fiber bundle, and 3 is a vinylon fiber monofilament constituting a sheath.

Fig. 2 shows the core yarn (coverage ≈ 100
%) 1 with the surface of the core yarn 1 being sheath fibers 3
Shows the state of being covered with.

FIG. 3 shows an example of the construction of the thread 4 of the present invention. The thread 4 has a structure in which the lower twisted yarn 5 using the core yarn 1 is plied (twisted).

FIG. 4 is a schematic representation of the cross section of the thread 4 shown in FIG. 3. The thread 4 has three core yarns 1 with a polyester multi-filament thread 6 as the core and vinylon fiber 7 as the sheath. This shows a structure in which three further combined lower twisted yarns 5 are combined and twisted (upper twisted).

FIG. 5 is a schematic representation of a cross section of the thread 8 not according to the present invention. The thread 8 further comprises three lower twisted threads 11 formed by intertwisting a polyester multifilament thread 9 and a vinylon spun thread 10. It has a structure that is twisted together (twisted).

As is clear from the comparison between FIG. 4 and FIG. 5, the yarn using the core yarn according to the present invention has vinylon as a sheath fiber covering almost the entire surface of the yarn, and the antistatic property,
Very easy to handle. On the other hand, it can be easily understood that the running yarn 8 has a small proportion of vinylon fibers on the surface of the running yarn, is inferior in antistatic property and is poor in handleability.

The thickness of the core yarn constituting the thread of the present invention is usually preferably 10 to 30 (cotton count), particularly around 20 count. The lower twisted yarn is obtained by plying 2 to 5 core yarns, and usually 3 ply yarns. In addition, it is general that three twisted yarns (upper twists) of lower twisted yarns are used as the thread. The thread is covered with a resin, and the resin is preferably a mixture of polyvinyl alcohol and polyacrylic ester.

The coverage (%) of the core yarn is obtained by the following method. Wrap the thread parallel to the panel, take a surface photograph with a universal projector or microscope, put a transparent paper on the photograph and trace the outer circumference of the thread, and the exposed part of the core fiber Fill in details. After that, cut the paper along the outer circumference of the thread and measure its weight to W ₀ , then cut the part where the core fiber is exposed and measure the weight.
_Set to ₁ . The coverage is Required by.

However, the trial of the core yarn to be traced is that the twist of the yarn is 10
The length should appear 0 times. That is,

Is.

The sheath fiber volume ratio in the core yarn is the ratio of the volume of the sheath fiber to the volume of all the fibers constituting the core yarn of a constant length, and the volume is obtained by dividing the weight by the respective densities. .

The present invention will be described below with reference to examples.

Example 1 Vinylon tow having a single fiber denier of 1.0 dr (1,000,000 dr of total tar denier) was cut by a parlock method to obtain a sliver having an average fiber length of 105 mm of short fibers. The sliver is supplied to a ring spinning machine after creating a roving through a normal spinning process, and polyester filament 150d / 32f serving as a core fiber bundle is supplied immediately before twisting, a sheath fiber volume ratio of 47%, a fineness of 270dr, A core yarn having a twist number of 10 t / in (Z) was produced. The coverage of this core yarn was 78%. The three core yarns were combined and subjected to 14 t / in (S) undertwisting, and the three undertwisted yarns were combined and subjected to 8 t / in (Z) upper twisting to obtain a twisted yarn. This twisted yarn was subjected to dipping treatment in a dispersion liquid having a solid content weight ratio of polyvinyl alcohol / acrylic acid ester resin of 50/50, and dried at 140 ° C. for 3 minutes under a tension of 0.2 g / d to give a resin adhesion ratio (vs. (Fiber) 10% thread was obtained. Table 1 shows the results of judging the performance of the running yarn by carrying out a weaving test using the running yarn on a jacquard loom.

Comparative Example 1 In the same manner as in Example 1, using a polyester filament of 200d / 48f for the core fiber bundle, the sheath fiber volume ratio was 26%, and the fineness was 265d.
A core yarn having r and a twist number of 10 t / in (Z) was produced. The coverage of this core yarn was 37%. Table 1 shows the results of a practical test in which the core yarn was used to prepare a continuous yarn in the same manner as in Example 1.

Comparative Example 2 Polyester multifilament yarn 250d / 48f with 9.5t / in
Two twisted yarns of (Z) and one vinylon barlock spun yarn 20 count (twisted number 9.8t / in (Z)) are twisted together to obtain a 14t / in (S) undertwisted yarn. The three twisted yarns thus prepared were combined and subjected to 8 t / in (Z) top twisting to obtain a twisted yarn, which was subjected to the same resin processing as in Example 1 to obtain a stitched yarn. Table 1 shows the performance of the thread for practical use.

[Brief description of drawings]

FIG. 1 is a sectional view of a core yarn constituting the present invention, FIG. 2 is a side view thereof, FIG. 3 is a side view of a threading yarn constituted by the present invention, FIG. 4 is a sectional view thereof, and FIG. FIG. 5 shows a cross-sectional view of a threading yarn not according to the present invention.

Claims (1)

[Scope of utility model registration request] 1. A core fiber bundle composed of polyester fibers is composed of sheath fibers composed of short vinylon fibers, and a single fiber constituting the sheath is substantially twisted with other single fibers constituting the sheath. A core yarn that is covered without a core yarn, which satisfies the coverage (%) represented by the following formula and has a sheath fiber volume ratio (%) of 30 to 80%. Coverage (%) ≧ sheath fiber volume ratio (%) in core yarn × 1.2