JPH01246431A - Nontwisted sized nylon yarn for warp of woven fabric - Google Patents

Abstract

PURPOSE:To obtain the subject nontwisted sized yarn capable of preventing the defect of UJIMORE (partial swell of beam surface, etc.) and imparting a nylon fabric with good weaving performance and good quality free from stretching and loosening, by specifying the elongation of the yarn. CONSTITUTION:The objective nontwisted sized yarn free from the swelling on the beam surface or the loosening of warp liable to be developed in the weaving of a drawn yarn produced by the high-speed spinning at >=3000m/min can be produced by conditioning a spun and drawn yarn of nylon fiber in such a manner as to give an elongation L(%) satisfying the formulas 0<= L<=3 and L={(l-l0)/l0}X100, wherein l0 is the length of yarn left for 2hr in an atmosphere of 25 deg.C and 40% RH(relative humidity) under a load of 0.3g/d and l is the length of the yarn measured after leaving the above yarn for 2hr in an atmosphere of 25 deg.C and 80% RH.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a nylon non-twisted sizing yarn for the warp of textiles. For more details, please refer to weavability and quality (hanging, looseness)
Good sizing is about threads.

(Prior art) Conventionally, when manufacturing textiles using synthetic fiber multifilament yarn for clothing, except for the raw yarn that can be woven without twisting or glue, the warp yarns are usually coated to prevent the generation of fuzz during weaving. Perform twisting or gluing.

In particular, thin yarns with a single yarn fineness of 2d or less and untwisted yarns are usually glued. Untwisted here means 20
Contains original twisted yarns of approximately T/m or less.

(Problem to be solved by the invention) However, when weaving on a loom using a beam of untwisted nylon filament yarn with a fine single yarn fineness and glued, the surface of the beam partially swells like a blister. , the warp threads become extremely loose in some areas, a defect commonly known as "maggot leakage" occurs.This is especially true for 3000 threads.
This is remarkable in the case of yarns spun at high speeds of m/min or higher.

When the "maggot leak" becomes strong, the warp threads become partially loosened, resulting in poor weaving performance due to poor shedding, and loose hanging defects on the gray fabric, resulting in a decline in quality.Causes for such "maggot leak" defects After careful consideration, we came to the conclusion that the following were the main causes.

In other words, the warp yarns that have been glued and beamed under relatively low humidity conditions are exposed to the relatively high humidity conditions in the loom room for a long time during weaving, so the warp yarns on the beam surface gradually absorb moisture. This is because elongation in the length direction occurs partially, and this is the cause of the "maggot leak" defect.

In addition, "maggot leak" is noticeable in the case of nylon filament yarn, but sizing of polyester filament yarn rarely occurs, and even if it occurs, it is very slight.This is generally This is because nylon thread has the property of being easy to stretch when it absorbs moisture.

In addition, due to sizing, when weaving in a water jet loom or when using yarn obtained by high-speed spinning of 3000 m/min or more, the problem of ``maggots'' is likely to occur.

The purpose of the present invention is to improve weaving performance and quality by solving the above-mentioned disadvantage of "maggots", and to provide a nylon non-twisted and glued yarn for textile warp yarns that does not cause "maggots". This is what I am trying to do.

(Means for Solving the Problem) The configuration of the present invention for achieving the above object is as follows: 0.3C
The yarn length after being left for 2 hours under a load of I/d at a temperature of 25°C and a relative humidity of 40% RH is 0. o, then temperature 25℃
A nylon non-twisted sizing yarn for textile warp yarns, characterized in that the elongation rate ΔL (%) satisfies the following formula, where α is the yarn length after being left for 2 hours under a relative humidity of 80% RH.

0≦ΔL≦3 8L= ((D, -〇, o )/D, o ) X 10
It is 0.

Here, to describe the measurement procedure for determining D, o, and α, first sample the yarn from the beam before weaving, then apply a load of 0.3 g/d to the sample at a temperature of 2.
The length after being left for 2 hours at 5℃ and relative humidity 40%RH is n.
o, then change the temperature to 25° C. and relative humidity to 80% RH while keeping the above load applied, and let the length after standing for 2 hours be α, and calculate ΔL using the above equation.

When the elongation rate ΔL exceeds 3%, the occurrence of "maggot mole" gradually becomes stronger, and in order to prevent "maggot mole" from occurring, Δ
It is necessary that L be 3% or less. Also, the elongation rate Δ
If L is less than 0%, it is undesirable because new vertical stripes will occur, so it must be 0% or more.

Here, as a means to reduce the elongation rate ΔL to 3% or less, the thread itself tends to shrink by drying under tension during the drying process, whereas the thread tends to elongate due to moisture absorption. It is particularly effective to provide the power to

As a result, the force acting in a direction that balances the force of the yarn to absorb moisture and try to stretch and the force of the yarn itself to shrink, and the elongation rate ΔL
can be kept below 3%.

The tension level of this tension drying ranges from 0.25 CI/d to 0.
．． It is desirable that the tension be within the range of up to 35q/d, but it may be selected appropriately depending on the degree of occurrence of "maggot leakage".By the way, the normal drying tension must be 0.20g/d or less.
．． Generally, it is about 15q/d.

In addition, as another means for reducing the elongation rate ΔL to 3% or less, the sizing can be forcibly absorbed moisture before being dry-fast beamed, and the sizing can be made into yarn that absorbs moisture during weaving. As a result, the occurrence of "maggot leak" can be suppressed.

In this case, it is desirable that the increase in moisture content due to moisture absorption and water absorption be 1 to 2%. Whichever method you choose,
In short, it is important to suppress the elongation rate ΔL to 3% or less.

Furthermore, if the elongation rate ΔL is less than 0%, it is not preferable because the vertical seam quality will deteriorate. In order to make the elongation rate ΔL 0% or more, the drying tension may be set so that the shrinkage of the yarn itself due to tension drying does not exceed the elongation due to moisture absorption. According to experiments conducted by the present inventors, it was found that it is desirable to set the dry tension to 0.35 g/d or less. Next, the present invention will be specifically explained based on Examples.

Example 1 Regarding a 5000 m/min high speed spun drawn yarn of nylon fiber and a low speed spun drawn yarn of 3000 m/min,
We investigated warp gluing. The warp fineness and single yarn count are both 70D/68F, and the weft is 3000m/m.
For nylon taffeta using 70D/24F of low-speed spun drawn yarn, the elongation rate was Δ, and the sizing was evaluated for the relationship between drying tension, “maggot leakage” in the water jet loom, weavability, and fabric quality. The results are shown in Table 1.

Table 2 shows the main conditions for gluing other than the dry tension of gluing.
The weaving conditions are shown in Table 3.

As shown in Table 1, the dry tension for gluing is 0.15 g/
In comparative examples such as Levels 5 and 7 where the elongation rate ΔL exceeds 3% in d, the occurrence of "maggot leakage" is strong, and as a result, the number of times the fluffing machine stops during weaving is 1.0 times/machine/daily income. Moreover, the hanging and looseness of the gray fabric is extremely noticeable and a problem. on the other hand,
The adhesive of the present invention has a dry tension of 0.25 and 0.3 g/d.
Levels 1, 2, and 3.4, where the elongation rate ΔL is 0% or more, have almost no problem with the maggot morepa defects, the number of warp naps is 0.5 times/day, and the weavability is good, and the warp hanging is good. , gray fabric defects such as looseness do not occur. Note that the elongation rate ΔL is 0
At levels 6 and 7, which are smaller than %, there is no problem of "maggot leakage", but vertical seam defects on the gray fabric occur, which is a problem. Looking at the relationship between spinning speed and maggot mole under the same conditions, it can be said that the defect of "maggot mole" occurs more easily at high speed spinning of 5000 n/min than at 3000 m/min. This is thought to be due to the difference in hygroscopicity due to the difference in the structure of the yarn.

Example 2 5000m/mi of nylon 500/40F as warp
3000 m as weft using high-speed spinning and drawing yarn at
For nylon taffeta using low-speed spun drawn yarn 70D/24F of The correspondence with quality was evaluated.The results are shown in Table 4.The conditions for sizing were nylon 5
0D/40F, dry tension was 0.150/d, and other conditions were the same as in Table 2. The weaving conditions were the same as in Table 3, except that the yarn used was warp nylon 50D/49F and the gray warp density was 135 threads/in.

As shown in Table 4, the dry tension for gluing is 0.15 g/d.
Even under the conventional conditions, as in Level 9 of the present invention, gluing is done by forced moisture application after drying (forced moisture rate 2.0%).
), the elongation rate ΔL was 1.5%, the occurrence of "maggot leaks" could be prevented, and the weaving performance was 0.3 times/day, which is the number of times the fuzz stopper was stopped.
It was possible to obtain a woven fabric with good gray quality, which was well attached to the stand and did not hang or loosen. Forcible moisture application after drying was carried out using an ordinary after-oiling roller.

(Effects of the Invention) The present invention has the above-mentioned nylon non-twisted sizing for warp yarns of textiles.By using yarn, the defect of "maggot leakage" can be prevented. It has the effect of being able to reduce the cost of high-quality nylon fabrics.

Claims (1)

[Claims] Under a load of 0.3 g/d, at a temperature of 25°C and a relative humidity of 40%.
When the yarn length after being left for 2 hours under RH is l_0, then when the yarn length after being left for 2 hours at a temperature of 25°C and relative humidity of 80% RH is l, the elongation rate ΔL (%) satisfies the following formula. A nylon non-twisted sizing yarn for textile warp yarns, which is characterized by: 0≦ΔL≦3 ΔL={(l-l_0)/l_0}×100